Add tty line support
[st.git] / st.c
1 /* See LICENSE for license details. */
2 #include <ctype.h>
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <limits.h>
6 #include <locale.h>
7 #include <pwd.h>
8 #include <stdarg.h>
9 #include <stdbool.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <signal.h>
14 #include <stdint.h>
15 #include <sys/ioctl.h>
16 #include <sys/select.h>
17 #include <sys/stat.h>
18 #include <sys/time.h>
19 #include <sys/types.h>
20 #include <sys/wait.h>
21 #include <time.h>
22 #include <unistd.h>
23 #include <libgen.h>
24 #include <X11/Xatom.h>
25 #include <X11/Xlib.h>
26 #include <X11/Xutil.h>
27 #include <X11/cursorfont.h>
28 #include <X11/keysym.h>
29 #include <X11/Xft/Xft.h>
30 #include <X11/XKBlib.h>
31 #include <fontconfig/fontconfig.h>
32 #include <wchar.h>
33
34 #include "arg.h"
35
36 char *argv0;
37
38 #define Glyph Glyph_
39 #define Font Font_
40
41 #if   defined(__linux)
42  #include <pty.h>
43 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
44  #include <util.h>
45 #elif defined(__FreeBSD__) || defined(__DragonFly__)
46  #include <libutil.h>
47 #endif
48
49
50 /* XEMBED messages */
51 #define XEMBED_FOCUS_IN  4
52 #define XEMBED_FOCUS_OUT 5
53
54 /* Arbitrary sizes */
55 #define UTF_INVALID   0xFFFD
56 #define UTF_SIZ       4
57 #define ESC_BUF_SIZ   (128*UTF_SIZ)
58 #define ESC_ARG_SIZ   16
59 #define STR_BUF_SIZ   ESC_BUF_SIZ
60 #define STR_ARG_SIZ   ESC_ARG_SIZ
61 #define DRAW_BUF_SIZ  20*1024
62 #define XK_ANY_MOD    UINT_MAX
63 #define XK_NO_MOD     0
64 #define XK_SWITCH_MOD (1<<13)
65
66 /* macros */
67 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
68 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
69 #define LEN(a)     (sizeof(a) / sizeof(a)[0])
70 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
71 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
72 #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == '\177')
73 #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f))
74 #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c))
75 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
76 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
77 #define IS_SET(flag) ((term.mode & (flag)) != 0)
78 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_nsec-t2.tv_nsec)/1E6)
79 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
80
81 #define TRUECOLOR(r,g,b) (1 << 24 | (r) << 16 | (g) << 8 | (b))
82 #define IS_TRUECOL(x)    (1 << 24 & (x))
83 #define TRUERED(x)       (((x) & 0xff0000) >> 8)
84 #define TRUEGREEN(x)     (((x) & 0xff00))
85 #define TRUEBLUE(x)      (((x) & 0xff) << 8)
86
87
88 enum glyph_attribute {
89         ATTR_NULL      = 0,
90         ATTR_BOLD      = 1 << 0,
91         ATTR_FAINT     = 1 << 1,
92         ATTR_ITALIC    = 1 << 2,
93         ATTR_UNDERLINE = 1 << 3,
94         ATTR_BLINK     = 1 << 4,
95         ATTR_REVERSE   = 1 << 5,
96         ATTR_INVISIBLE = 1 << 6,
97         ATTR_STRUCK    = 1 << 7,
98         ATTR_WRAP      = 1 << 8,
99         ATTR_WIDE      = 1 << 9,
100         ATTR_WDUMMY    = 1 << 10,
101 };
102
103 enum cursor_movement {
104         CURSOR_SAVE,
105         CURSOR_LOAD
106 };
107
108 enum cursor_state {
109         CURSOR_DEFAULT  = 0,
110         CURSOR_WRAPNEXT = 1,
111         CURSOR_ORIGIN   = 2
112 };
113
114 enum term_mode {
115         MODE_WRAP        = 1 << 0,
116         MODE_INSERT      = 1 << 1,
117         MODE_APPKEYPAD   = 1 << 2,
118         MODE_ALTSCREEN   = 1 << 3,
119         MODE_CRLF        = 1 << 4,
120         MODE_MOUSEBTN    = 1 << 5,
121         MODE_MOUSEMOTION = 1 << 6,
122         MODE_REVERSE     = 1 << 7,
123         MODE_KBDLOCK     = 1 << 8,
124         MODE_HIDE        = 1 << 9,
125         MODE_ECHO        = 1 << 10,
126         MODE_APPCURSOR   = 1 << 11,
127         MODE_MOUSESGR    = 1 << 12,
128         MODE_8BIT        = 1 << 13,
129         MODE_BLINK       = 1 << 14,
130         MODE_FBLINK      = 1 << 15,
131         MODE_FOCUS       = 1 << 16,
132         MODE_MOUSEX10    = 1 << 17,
133         MODE_MOUSEMANY   = 1 << 18,
134         MODE_BRCKTPASTE  = 1 << 19,
135         MODE_PRINT       = 1 << 20,
136         MODE_MOUSE       = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
137                           |MODE_MOUSEMANY,
138 };
139
140 enum charset {
141         CS_GRAPHIC0,
142         CS_GRAPHIC1,
143         CS_UK,
144         CS_USA,
145         CS_MULTI,
146         CS_GER,
147         CS_FIN
148 };
149
150 enum escape_state {
151         ESC_START      = 1,
152         ESC_CSI        = 2,
153         ESC_STR        = 4,  /* DCS, OSC, PM, APC */
154         ESC_ALTCHARSET = 8,
155         ESC_STR_END    = 16, /* a final string was encountered */
156         ESC_TEST       = 32, /* Enter in test mode */
157 };
158
159 enum window_state {
160         WIN_VISIBLE = 1,
161         WIN_REDRAW  = 2,
162         WIN_FOCUSED = 4
163 };
164
165 enum selection_type {
166         SEL_REGULAR = 1,
167         SEL_RECTANGULAR = 2
168 };
169
170 enum selection_snap {
171         SNAP_WORD = 1,
172         SNAP_LINE = 2
173 };
174
175 typedef unsigned char uchar;
176 typedef unsigned int uint;
177 typedef unsigned long ulong;
178 typedef unsigned short ushort;
179
180 typedef XftDraw *Draw;
181 typedef XftColor Color;
182
183 typedef struct {
184         char c[UTF_SIZ]; /* character code */
185         ushort mode;      /* attribute flags */
186         uint32_t fg;      /* foreground  */
187         uint32_t bg;      /* background  */
188 } Glyph;
189
190 typedef Glyph *Line;
191
192 typedef struct {
193         Glyph attr; /* current char attributes */
194         int x;
195         int y;
196         char state;
197 } TCursor;
198
199 /* CSI Escape sequence structs */
200 /* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
201 typedef struct {
202         char buf[ESC_BUF_SIZ]; /* raw string */
203         int len;               /* raw string length */
204         char priv;
205         int arg[ESC_ARG_SIZ];
206         int narg;              /* nb of args */
207         char mode[2];
208 } CSIEscape;
209
210 /* STR Escape sequence structs */
211 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
212 typedef struct {
213         char type;             /* ESC type ... */
214         char buf[STR_BUF_SIZ]; /* raw string */
215         int len;               /* raw string length */
216         char *args[STR_ARG_SIZ];
217         int narg;              /* nb of args */
218 } STREscape;
219
220 /* Internal representation of the screen */
221 typedef struct {
222         int row;      /* nb row */
223         int col;      /* nb col */
224         Line *line;   /* screen */
225         Line *alt;    /* alternate screen */
226         bool *dirty;  /* dirtyness of lines */
227         TCursor c;    /* cursor */
228         int top;      /* top    scroll limit */
229         int bot;      /* bottom scroll limit */
230         int mode;     /* terminal mode flags */
231         int esc;      /* escape state flags */
232         char trantbl[4]; /* charset table translation */
233         int charset;  /* current charset */
234         int icharset; /* selected charset for sequence */
235         bool numlock; /* lock numbers in keyboard */
236         bool *tabs;
237 } Term;
238
239 /* Purely graphic info */
240 typedef struct {
241         Display *dpy;
242         Colormap cmap;
243         Window win;
244         Drawable buf;
245         Atom xembed, wmdeletewin, netwmname, netwmpid;
246         XIM xim;
247         XIC xic;
248         Draw draw;
249         Visual *vis;
250         XSetWindowAttributes attrs;
251         int scr;
252         bool isfixed; /* is fixed geometry? */
253         int l, t; /* left and top offset */
254         int gm; /* geometry mask */
255         int tw, th; /* tty width and height */
256         int w, h; /* window width and height */
257         int ch; /* char height */
258         int cw; /* char width  */
259         char state; /* focus, redraw, visible */
260         int cursor; /* cursor style */
261 } XWindow;
262
263 typedef struct {
264         uint b;
265         uint mask;
266         char *s;
267 } Mousekey;
268
269 typedef struct {
270         KeySym k;
271         uint mask;
272         char *s;
273         /* three valued logic variables: 0 indifferent, 1 on, -1 off */
274         signed char appkey;    /* application keypad */
275         signed char appcursor; /* application cursor */
276         signed char crlf;      /* crlf mode          */
277 } Key;
278
279 typedef struct {
280         int mode;
281         int type;
282         int snap;
283         /*
284          * Selection variables:
285          * nb – normalized coordinates of the beginning of the selection
286          * ne – normalized coordinates of the end of the selection
287          * ob – original coordinates of the beginning of the selection
288          * oe – original coordinates of the end of the selection
289          */
290         struct {
291                 int x, y;
292         } nb, ne, ob, oe;
293
294         char *primary, *clipboard;
295         Atom xtarget;
296         bool alt;
297         struct timespec tclick1;
298         struct timespec tclick2;
299 } Selection;
300
301 typedef union {
302         int i;
303         uint ui;
304         float f;
305         const void *v;
306 } Arg;
307
308 typedef struct {
309         uint mod;
310         KeySym keysym;
311         void (*func)(const Arg *);
312         const Arg arg;
313 } Shortcut;
314
315 /* function definitions used in config.h */
316 static void clipcopy(const Arg *);
317 static void clippaste(const Arg *);
318 static void numlock(const Arg *);
319 static void selpaste(const Arg *);
320 static void xzoom(const Arg *);
321 static void xzoomabs(const Arg *);
322 static void xzoomreset(const Arg *);
323 static void printsel(const Arg *);
324 static void printscreen(const Arg *) ;
325 static void toggleprinter(const Arg *);
326
327 /* Config.h for applying patches and the configuration. */
328 #include "config.h"
329
330 /* Font structure */
331 typedef struct {
332         int height;
333         int width;
334         int ascent;
335         int descent;
336         short lbearing;
337         short rbearing;
338         XftFont *match;
339         FcFontSet *set;
340         FcPattern *pattern;
341 } Font;
342
343 /* Drawing Context */
344 typedef struct {
345         Color col[MAX(LEN(colorname), 256)];
346         Font font, bfont, ifont, ibfont;
347         GC gc;
348 } DC;
349
350 static void die(const char *, ...);
351 static void draw(void);
352 static void redraw(void);
353 static void drawregion(int, int, int, int);
354 static void execsh(void);
355 static void stty(void);
356 static void sigchld(int);
357 static void run(void);
358
359 static void csidump(void);
360 static void csihandle(void);
361 static void csiparse(void);
362 static void csireset(void);
363 static int eschandle(uchar);
364 static void strdump(void);
365 static void strhandle(void);
366 static void strparse(void);
367 static void strreset(void);
368
369 static int tattrset(int);
370 static void tprinter(char *, size_t);
371 static void tdumpsel(void);
372 static void tdumpline(int);
373 static void tdump(void);
374 static void tclearregion(int, int, int, int);
375 static void tcursor(int);
376 static void tdeletechar(int);
377 static void tdeleteline(int);
378 static void tinsertblank(int);
379 static void tinsertblankline(int);
380 static int tlinelen(int);
381 static void tmoveto(int, int);
382 static void tmoveato(int, int);
383 static void tnew(int, int);
384 static void tnewline(int);
385 static void tputtab(int);
386 static void tputc(char *, int);
387 static void treset(void);
388 static void tresize(int, int);
389 static void tscrollup(int, int);
390 static void tscrolldown(int, int);
391 static void tsetattr(int *, int);
392 static void tsetchar(char *, Glyph *, int, int);
393 static void tsetscroll(int, int);
394 static void tswapscreen(void);
395 static void tsetdirt(int, int);
396 static void tsetdirtattr(int);
397 static void tsetmode(bool, bool, int *, int);
398 static void tfulldirt(void);
399 static void techo(char *, int);
400 static void tcontrolcode(uchar );
401 static void tdectest(char );
402 static int32_t tdefcolor(int *, int *, int);
403 static void tdeftran(char);
404 static inline bool match(uint, uint);
405 static void ttynew(void);
406 static void ttyread(void);
407 static void ttyresize(void);
408 static void ttysend(char *, size_t);
409 static void ttywrite(const char *, size_t);
410 static void tstrsequence(uchar);
411
412 static inline ushort sixd_to_16bit(int);
413 static void xdraws(char *, Glyph, int, int, int, int);
414 static void xhints(void);
415 static void xclear(int, int, int, int);
416 static void xdrawcursor(void);
417 static void xinit(void);
418 static void xloadcols(void);
419 static int xsetcolorname(int, const char *);
420 static int xgeommasktogravity(int);
421 static int xloadfont(Font *, FcPattern *);
422 static void xloadfonts(char *, double);
423 static void xsettitle(char *);
424 static void xresettitle(void);
425 static void xsetpointermotion(int);
426 static void xseturgency(int);
427 static void xsetsel(char *, Time);
428 static void xtermclear(int, int, int, int);
429 static void xunloadfont(Font *);
430 static void xunloadfonts(void);
431 static void xresize(int, int);
432
433 static void expose(XEvent *);
434 static void visibility(XEvent *);
435 static void unmap(XEvent *);
436 static char *kmap(KeySym, uint);
437 static void kpress(XEvent *);
438 static void cmessage(XEvent *);
439 static void cresize(int, int);
440 static void resize(XEvent *);
441 static void focus(XEvent *);
442 static void brelease(XEvent *);
443 static void bpress(XEvent *);
444 static void bmotion(XEvent *);
445 static void selnotify(XEvent *);
446 static void selclear(XEvent *);
447 static void selrequest(XEvent *);
448
449 static void selinit(void);
450 static void selnormalize(void);
451 static inline bool selected(int, int);
452 static char *getsel(void);
453 static void selcopy(Time);
454 static void selscroll(int, int);
455 static void selsnap(int, int *, int *, int);
456 static int x2col(int);
457 static int y2row(int);
458 static void getbuttoninfo(XEvent *);
459 static void mousereport(XEvent *);
460
461 static size_t utf8decode(char *, long *, size_t);
462 static long utf8decodebyte(char, size_t *);
463 static size_t utf8encode(long, char *, size_t);
464 static char utf8encodebyte(long, size_t);
465 static size_t utf8len(char *);
466 static size_t utf8validate(long *, size_t);
467
468 static ssize_t xwrite(int, const char *, size_t);
469 static void *xmalloc(size_t);
470 static void *xrealloc(void *, size_t);
471 static char *xstrdup(char *);
472
473 static void usage(void);
474
475 static void (*handler[LASTEvent])(XEvent *) = {
476         [KeyPress] = kpress,
477         [ClientMessage] = cmessage,
478         [ConfigureNotify] = resize,
479         [VisibilityNotify] = visibility,
480         [UnmapNotify] = unmap,
481         [Expose] = expose,
482         [FocusIn] = focus,
483         [FocusOut] = focus,
484         [MotionNotify] = bmotion,
485         [ButtonPress] = bpress,
486         [ButtonRelease] = brelease,
487 /*
488  * Uncomment if you want the selection to disappear when you select something
489  * different in another window.
490  */
491 /*      [SelectionClear] = selclear, */
492         [SelectionNotify] = selnotify,
493         [SelectionRequest] = selrequest,
494 };
495
496 /* Globals */
497 static DC dc;
498 static XWindow xw;
499 static Term term;
500 static CSIEscape csiescseq;
501 static STREscape strescseq;
502 static int cmdfd;
503 static pid_t pid;
504 static Selection sel;
505 static int iofd = STDOUT_FILENO;
506 static char **opt_cmd = NULL;
507 static char *opt_io = NULL;
508 static char *opt_title = NULL;
509 static char *opt_embed = NULL;
510 static char *opt_class = NULL;
511 static char *opt_font = NULL;
512 static char *opt_line = NULL;
513 static int oldbutton = 3; /* button event on startup: 3 = release */
514
515 static char *usedfont = NULL;
516 static double usedfontsize = 0;
517 static double defaultfontsize = 0;
518
519 static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
520 static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
521 static long utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
522 static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
523
524 /* Font Ring Cache */
525 enum {
526         FRC_NORMAL,
527         FRC_ITALIC,
528         FRC_BOLD,
529         FRC_ITALICBOLD
530 };
531
532 typedef struct {
533         XftFont *font;
534         int flags;
535         long unicodep;
536 } Fontcache;
537
538 /* Fontcache is an array now. A new font will be appended to the array. */
539 static Fontcache frc[16];
540 static int frclen = 0;
541
542 ssize_t
543 xwrite(int fd, const char *s, size_t len) {
544         size_t aux = len;
545
546         while(len > 0) {
547                 ssize_t r = write(fd, s, len);
548                 if(r < 0)
549                         return r;
550                 len -= r;
551                 s += r;
552         }
553         return aux;
554 }
555
556 void *
557 xmalloc(size_t len) {
558         void *p = malloc(len);
559
560         if(!p)
561                 die("Out of memory\n");
562
563         return p;
564 }
565
566 void *
567 xrealloc(void *p, size_t len) {
568         if((p = realloc(p, len)) == NULL)
569                 die("Out of memory\n");
570
571         return p;
572 }
573
574 char *
575 xstrdup(char *s) {
576         if((s = strdup(s)) == NULL)
577                 die("Out of memory\n");
578
579         return s;
580 }
581
582 size_t
583 utf8decode(char *c, long *u, size_t clen) {
584         size_t i, j, len, type;
585         long udecoded;
586
587         *u = UTF_INVALID;
588         if(!clen)
589                 return 0;
590         udecoded = utf8decodebyte(c[0], &len);
591         if(!BETWEEN(len, 1, UTF_SIZ))
592                 return 1;
593         for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
594                 udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
595                 if(type != 0)
596                         return j;
597         }
598         if(j < len)
599                 return 0;
600         *u = udecoded;
601         utf8validate(u, len);
602         return len;
603 }
604
605 long
606 utf8decodebyte(char c, size_t *i) {
607         for(*i = 0; *i < LEN(utfmask); ++(*i))
608                 if(((uchar)c & utfmask[*i]) == utfbyte[*i])
609                         return (uchar)c & ~utfmask[*i];
610         return 0;
611 }
612
613 size_t
614 utf8encode(long u, char *c, size_t clen) {
615         size_t len, i;
616
617         len = utf8validate(&u, 0);
618         if(clen < len)
619                 return 0;
620         for(i = len - 1; i != 0; --i) {
621                 c[i] = utf8encodebyte(u, 0);
622                 u >>= 6;
623         }
624         c[0] = utf8encodebyte(u, len);
625         return len;
626 }
627
628 char
629 utf8encodebyte(long u, size_t i) {
630         return utfbyte[i] | (u & ~utfmask[i]);
631 }
632
633 size_t
634 utf8len(char *c) {
635         return utf8decode(c, &(long){0}, UTF_SIZ);
636 }
637
638 size_t
639 utf8validate(long *u, size_t i) {
640         if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
641                 *u = UTF_INVALID;
642         for(i = 1; *u > utfmax[i]; ++i)
643                 ;
644         return i;
645 }
646
647 void
648 selinit(void) {
649         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
650         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
651         sel.mode = 0;
652         sel.ob.x = -1;
653         sel.primary = NULL;
654         sel.clipboard = NULL;
655         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
656         if(sel.xtarget == None)
657                 sel.xtarget = XA_STRING;
658 }
659
660 int
661 x2col(int x) {
662         x -= borderpx;
663         x /= xw.cw;
664
665         return LIMIT(x, 0, term.col-1);
666 }
667
668 int
669 y2row(int y) {
670         y -= borderpx;
671         y /= xw.ch;
672
673         return LIMIT(y, 0, term.row-1);
674 }
675
676 int tlinelen(int y) {
677         int i = term.col;
678
679         if(term.line[y][i - 1].mode & ATTR_WRAP)
680                 return i;
681
682         while(i > 0 && term.line[y][i - 1].c[0] == ' ')
683                 --i;
684
685         return i;
686 }
687
688 void
689 selnormalize(void) {
690         int i;
691
692         if(sel.ob.y == sel.oe.y || sel.type == SEL_RECTANGULAR) {
693                 sel.nb.x = MIN(sel.ob.x, sel.oe.x);
694                 sel.ne.x = MAX(sel.ob.x, sel.oe.x);
695         } else {
696                 sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
697                 sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
698         }
699         sel.nb.y = MIN(sel.ob.y, sel.oe.y);
700         sel.ne.y = MAX(sel.ob.y, sel.oe.y);
701
702         selsnap(sel.snap, &sel.nb.x, &sel.nb.y, -1);
703         selsnap(sel.snap, &sel.ne.x, &sel.ne.y, +1);
704
705         /* expand selection over line breaks */
706         if (sel.type == SEL_RECTANGULAR)
707                 return;
708         i = tlinelen(sel.nb.y);
709         if (i < sel.nb.x)
710                 sel.nb.x = i;
711         if (tlinelen(sel.ne.y) <= sel.ne.x)
712                 sel.ne.x = term.col - 1;
713 }
714
715 bool
716 selected(int x, int y) {
717         if(sel.type == SEL_RECTANGULAR)
718                 return BETWEEN(y, sel.nb.y, sel.ne.y)
719                     && BETWEEN(x, sel.nb.x, sel.ne.x);
720
721         return BETWEEN(y, sel.nb.y, sel.ne.y)
722             && (y != sel.nb.y || x >= sel.nb.x)
723             && (y != sel.ne.y || x <= sel.ne.x);
724 }
725
726 void
727 selsnap(int mode, int *x, int *y, int direction) {
728         int newx, newy, xt, yt;
729         bool delim, prevdelim;
730         Glyph *gp, *prevgp;
731
732         switch(mode) {
733         case SNAP_WORD:
734                 /*
735                  * Snap around if the word wraps around at the end or
736                  * beginning of a line.
737                  */
738                 prevgp = &term.line[*y][*x];
739                 prevdelim = strchr(worddelimiters, prevgp->c[0]) != NULL;
740                 for(;;) {
741                         newx = *x + direction;
742                         newy = *y;
743                         if(!BETWEEN(newx, 0, term.col - 1)) {
744                                 newy += direction;
745                                 newx = (newx + term.col) % term.col;
746                                 if (!BETWEEN(newy, 0, term.row - 1))
747                                         break;
748
749                                 if(direction > 0)
750                                         yt = *y, xt = *x;
751                                 else
752                                         yt = newy, xt = newx;
753                                 if(!(term.line[yt][xt].mode & ATTR_WRAP))
754                                         break;
755                         }
756
757                         if (newx >= tlinelen(newy))
758                                 break;
759
760                         gp = &term.line[newy][newx];
761                         delim = strchr(worddelimiters, gp->c[0]) != NULL;
762                         if(!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
763                                         || (delim && gp->c[0] != prevgp->c[0])))
764                                 break;
765
766                         *x = newx;
767                         *y = newy;
768                         prevgp = gp;
769                         prevdelim = delim;
770                 }
771                 break;
772         case SNAP_LINE:
773                 /*
774                  * Snap around if the the previous line or the current one
775                  * has set ATTR_WRAP at its end. Then the whole next or
776                  * previous line will be selected.
777                  */
778                 *x = (direction < 0) ? 0 : term.col - 1;
779                 if(direction < 0 && *y > 0) {
780                         for(; *y > 0; *y += direction) {
781                                 if(!(term.line[*y-1][term.col-1].mode
782                                                 & ATTR_WRAP)) {
783                                         break;
784                                 }
785                         }
786                 } else if(direction > 0 && *y < term.row-1) {
787                         for(; *y < term.row; *y += direction) {
788                                 if(!(term.line[*y][term.col-1].mode
789                                                 & ATTR_WRAP)) {
790                                         break;
791                                 }
792                         }
793                 }
794                 break;
795         }
796 }
797
798 void
799 getbuttoninfo(XEvent *e) {
800         int type;
801         uint state = e->xbutton.state & ~(Button1Mask | forceselmod);
802
803         sel.alt = IS_SET(MODE_ALTSCREEN);
804
805         sel.oe.x = x2col(e->xbutton.x);
806         sel.oe.y = y2row(e->xbutton.y);
807         selnormalize();
808
809         sel.type = SEL_REGULAR;
810         for(type = 1; type < LEN(selmasks); ++type) {
811                 if(match(selmasks[type], state)) {
812                         sel.type = type;
813                         break;
814                 }
815         }
816 }
817
818 void
819 mousereport(XEvent *e) {
820         int x = x2col(e->xbutton.x), y = y2row(e->xbutton.y),
821             button = e->xbutton.button, state = e->xbutton.state,
822             len;
823         char buf[40];
824         static int ox, oy;
825
826         /* from urxvt */
827         if(e->xbutton.type == MotionNotify) {
828                 if(x == ox && y == oy)
829                         return;
830                 if(!IS_SET(MODE_MOUSEMOTION) && !IS_SET(MODE_MOUSEMANY))
831                         return;
832                 /* MOUSE_MOTION: no reporting if no button is pressed */
833                 if(IS_SET(MODE_MOUSEMOTION) && oldbutton == 3)
834                         return;
835
836                 button = oldbutton + 32;
837                 ox = x;
838                 oy = y;
839         } else {
840                 if(!IS_SET(MODE_MOUSESGR) && e->xbutton.type == ButtonRelease) {
841                         button = 3;
842                 } else {
843                         button -= Button1;
844                         if(button >= 3)
845                                 button += 64 - 3;
846                 }
847                 if(e->xbutton.type == ButtonPress) {
848                         oldbutton = button;
849                         ox = x;
850                         oy = y;
851                 } else if(e->xbutton.type == ButtonRelease) {
852                         oldbutton = 3;
853                         /* MODE_MOUSEX10: no button release reporting */
854                         if(IS_SET(MODE_MOUSEX10))
855                                 return;
856                         if (button == 64 || button == 65)
857                                 return;
858                 }
859         }
860
861         if(!IS_SET(MODE_MOUSEX10)) {
862                 button += (state & ShiftMask   ? 4  : 0)
863                         + (state & Mod4Mask    ? 8  : 0)
864                         + (state & ControlMask ? 16 : 0);
865         }
866
867         len = 0;
868         if(IS_SET(MODE_MOUSESGR)) {
869                 len = snprintf(buf, sizeof(buf), "\033[<%d;%d;%d%c",
870                                 button, x+1, y+1,
871                                 e->xbutton.type == ButtonRelease ? 'm' : 'M');
872         } else if(x < 223 && y < 223) {
873                 len = snprintf(buf, sizeof(buf), "\033[M%c%c%c",
874                                 32+button, 32+x+1, 32+y+1);
875         } else {
876                 return;
877         }
878
879         ttywrite(buf, len);
880 }
881
882 void
883 bpress(XEvent *e) {
884         struct timespec now;
885         Mousekey *mk;
886
887         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
888                 mousereport(e);
889                 return;
890         }
891
892         for(mk = mshortcuts; mk < mshortcuts + LEN(mshortcuts); mk++) {
893                 if(e->xbutton.button == mk->b
894                                 && match(mk->mask, e->xbutton.state)) {
895                         ttysend(mk->s, strlen(mk->s));
896                         return;
897                 }
898         }
899
900         if(e->xbutton.button == Button1) {
901                 clock_gettime(CLOCK_MONOTONIC, &now);
902
903                 /* Clear previous selection, logically and visually. */
904                 selclear(NULL);
905                 sel.mode = 1;
906                 sel.type = SEL_REGULAR;
907                 sel.oe.x = sel.ob.x = x2col(e->xbutton.x);
908                 sel.oe.y = sel.ob.y = y2row(e->xbutton.y);
909
910                 /*
911                  * If the user clicks below predefined timeouts specific
912                  * snapping behaviour is exposed.
913                  */
914                 if(TIMEDIFF(now, sel.tclick2) <= tripleclicktimeout) {
915                         sel.snap = SNAP_LINE;
916                 } else if(TIMEDIFF(now, sel.tclick1) <= doubleclicktimeout) {
917                         sel.snap = SNAP_WORD;
918                 } else {
919                         sel.snap = 0;
920                 }
921                 selnormalize();
922
923                 /*
924                  * Draw selection, unless it's regular and we don't want to
925                  * make clicks visible
926                  */
927                 if(sel.snap != 0) {
928                         sel.mode++;
929                         tsetdirt(sel.nb.y, sel.ne.y);
930                 }
931                 sel.tclick2 = sel.tclick1;
932                 sel.tclick1 = now;
933         }
934 }
935
936 char *
937 getsel(void) {
938         char *str, *ptr;
939         int y, bufsize, size, lastx, linelen;
940         Glyph *gp, *last;
941
942         if(sel.ob.x == -1)
943                 return NULL;
944
945         bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
946         ptr = str = xmalloc(bufsize);
947
948         /* append every set & selected glyph to the selection */
949         for(y = sel.nb.y; y <= sel.ne.y; y++) {
950                 linelen = tlinelen(y);
951
952                 if(sel.type == SEL_RECTANGULAR) {
953                         gp = &term.line[y][sel.nb.x];
954                         lastx = sel.ne.x;
955                 } else {
956                         gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
957                         lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
958                 }
959                 last = &term.line[y][MIN(lastx, linelen-1)];
960                 while(last >= gp && last->c[0] == ' ')
961                         --last;
962
963                 for( ; gp <= last; ++gp) {
964                         if(gp->mode & ATTR_WDUMMY)
965                                 continue;
966
967                         size = utf8len(gp->c);
968                         memcpy(ptr, gp->c, size);
969                         ptr += size;
970                 }
971
972                 /*
973                  * Copy and pasting of line endings is inconsistent
974                  * in the inconsistent terminal and GUI world.
975                  * The best solution seems like to produce '\n' when
976                  * something is copied from st and convert '\n' to
977                  * '\r', when something to be pasted is received by
978                  * st.
979                  * FIXME: Fix the computer world.
980                  */
981                 if((y < sel.ne.y || lastx >= linelen) && !(last->mode & ATTR_WRAP))
982                         *ptr++ = '\n';
983         }
984         *ptr = 0;
985         return str;
986 }
987
988 void
989 selcopy(Time t) {
990         xsetsel(getsel(), t);
991 }
992
993 void
994 selnotify(XEvent *e) {
995         ulong nitems, ofs, rem;
996         int format;
997         uchar *data, *last, *repl;
998         Atom type;
999         XSelectionEvent *xsev;
1000
1001         ofs = 0;
1002         xsev = &e->xselection;
1003         if (xsev->property == None)
1004             return;
1005         do {
1006                 if(XGetWindowProperty(xw.dpy, xw.win, xsev->property, ofs,
1007                                         BUFSIZ/4, False, AnyPropertyType,
1008                                         &type, &format, &nitems, &rem,
1009                                         &data)) {
1010                         fprintf(stderr, "Clipboard allocation failed\n");
1011                         return;
1012                 }
1013
1014                 /*
1015                  * As seen in getsel:
1016                  * Line endings are inconsistent in the terminal and GUI world
1017                  * copy and pasting. When receiving some selection data,
1018                  * replace all '\n' with '\r'.
1019                  * FIXME: Fix the computer world.
1020                  */
1021                 repl = data;
1022                 last = data + nitems * format / 8;
1023                 while((repl = memchr(repl, '\n', last - repl))) {
1024                         *repl++ = '\r';
1025                 }
1026
1027                 if(IS_SET(MODE_BRCKTPASTE))
1028                         ttywrite("\033[200~", 6);
1029                 ttysend((char *)data, nitems * format / 8);
1030                 if(IS_SET(MODE_BRCKTPASTE))
1031                         ttywrite("\033[201~", 6);
1032                 XFree(data);
1033                 /* number of 32-bit chunks returned */
1034                 ofs += nitems * format / 32;
1035         } while(rem > 0);
1036 }
1037
1038 void
1039 selpaste(const Arg *dummy) {
1040         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY,
1041                         xw.win, CurrentTime);
1042 }
1043
1044 void
1045 clipcopy(const Arg *dummy) {
1046         Atom clipboard;
1047
1048         if(sel.clipboard != NULL)
1049                 free(sel.clipboard);
1050
1051         if(sel.primary != NULL) {
1052                 sel.clipboard = xstrdup(sel.primary);
1053                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1054                 XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
1055         }
1056 }
1057
1058 void
1059 clippaste(const Arg *dummy) {
1060         Atom clipboard;
1061
1062         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1063         XConvertSelection(xw.dpy, clipboard, sel.xtarget, clipboard,
1064                         xw.win, CurrentTime);
1065 }
1066
1067 void
1068 selclear(XEvent *e) {
1069         if(sel.ob.x == -1)
1070                 return;
1071         sel.ob.x = -1;
1072         tsetdirt(sel.nb.y, sel.ne.y);
1073 }
1074
1075 void
1076 selrequest(XEvent *e) {
1077         XSelectionRequestEvent *xsre;
1078         XSelectionEvent xev;
1079         Atom xa_targets, string, clipboard;
1080         char *seltext;
1081
1082         xsre = (XSelectionRequestEvent *) e;
1083         xev.type = SelectionNotify;
1084         xev.requestor = xsre->requestor;
1085         xev.selection = xsre->selection;
1086         xev.target = xsre->target;
1087         xev.time = xsre->time;
1088         if (xsre->property == None)
1089             xsre->property = xsre->target;
1090
1091         /* reject */
1092         xev.property = None;
1093
1094         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
1095         if(xsre->target == xa_targets) {
1096                 /* respond with the supported type */
1097                 string = sel.xtarget;
1098                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
1099                                 XA_ATOM, 32, PropModeReplace,
1100                                 (uchar *) &string, 1);
1101                 xev.property = xsre->property;
1102         } else if(xsre->target == sel.xtarget || xsre->target == XA_STRING) {
1103                 /*
1104                  * xith XA_STRING non ascii characters may be incorrect in the
1105                  * requestor. It is not our problem, use utf8.
1106                  */
1107                 clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
1108                 if(xsre->selection == XA_PRIMARY) {
1109                         seltext = sel.primary;
1110                 } else if(xsre->selection == clipboard) {
1111                         seltext = sel.clipboard;
1112                 } else {
1113                         fprintf(stderr,
1114                                 "Unhandled clipboard selection 0x%lx\n",
1115                                 xsre->selection);
1116                         return;
1117                 }
1118                 if(seltext != NULL) {
1119                         XChangeProperty(xsre->display, xsre->requestor,
1120                                         xsre->property, xsre->target,
1121                                         8, PropModeReplace,
1122                                         (uchar *)seltext, strlen(seltext));
1123                         xev.property = xsre->property;
1124                 }
1125         }
1126
1127         /* all done, send a notification to the listener */
1128         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
1129                 fprintf(stderr, "Error sending SelectionNotify event\n");
1130 }
1131
1132 void
1133 xsetsel(char *str, Time t) {
1134         free(sel.primary);
1135         sel.primary = str;
1136
1137         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, t);
1138         if (XGetSelectionOwner(xw.dpy, XA_PRIMARY) != xw.win)
1139             selclear(0);
1140 }
1141
1142 void
1143 brelease(XEvent *e) {
1144         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1145                 mousereport(e);
1146                 return;
1147         }
1148
1149         if(e->xbutton.button == Button2) {
1150                 selpaste(NULL);
1151         } else if(e->xbutton.button == Button1) {
1152                 if(sel.mode < 2) {
1153                         selclear(NULL);
1154                 } else {
1155                         getbuttoninfo(e);
1156                         selcopy(e->xbutton.time);
1157                 }
1158                 sel.mode = 0;
1159                 tsetdirt(sel.nb.y, sel.ne.y);
1160         }
1161 }
1162
1163 void
1164 bmotion(XEvent *e) {
1165         int oldey, oldex, oldsby, oldsey;
1166
1167         if(IS_SET(MODE_MOUSE) && !(e->xbutton.state & forceselmod)) {
1168                 mousereport(e);
1169                 return;
1170         }
1171
1172         if(!sel.mode)
1173                 return;
1174
1175         sel.mode++;
1176         oldey = sel.oe.y;
1177         oldex = sel.oe.x;
1178         oldsby = sel.nb.y;
1179         oldsey = sel.ne.y;
1180         getbuttoninfo(e);
1181
1182         if(oldey != sel.oe.y || oldex != sel.oe.x)
1183                 tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
1184 }
1185
1186 void
1187 die(const char *errstr, ...) {
1188         va_list ap;
1189
1190         va_start(ap, errstr);
1191         vfprintf(stderr, errstr, ap);
1192         va_end(ap);
1193         exit(EXIT_FAILURE);
1194 }
1195
1196 void
1197 execsh(void) {
1198         char **args, *sh, *prog;
1199         const struct passwd *pw;
1200         char buf[sizeof(long) * 8 + 1];
1201
1202         errno = 0;
1203         if((pw = getpwuid(getuid())) == NULL) {
1204                 if(errno)
1205                         die("getpwuid:%s\n", strerror(errno));
1206                 else
1207                         die("who are you?\n");
1208         }
1209
1210         if (!(sh = getenv("SHELL"))) {
1211                 sh = (pw->pw_shell[0]) ? pw->pw_shell : shell;
1212         }
1213
1214         if(opt_cmd)
1215                 prog = opt_cmd[0];
1216         else if(utmp)
1217                 prog = utmp;
1218         else
1219                 prog = sh;
1220         args = (opt_cmd) ? opt_cmd : (char *[]) {prog, NULL};
1221
1222         snprintf(buf, sizeof(buf), "%lu", xw.win);
1223
1224         unsetenv("COLUMNS");
1225         unsetenv("LINES");
1226         unsetenv("TERMCAP");
1227         setenv("LOGNAME", pw->pw_name, 1);
1228         setenv("USER", pw->pw_name, 1);
1229         setenv("SHELL", sh, 1);
1230         setenv("HOME", pw->pw_dir, 1);
1231         setenv("TERM", termname, 1);
1232         setenv("WINDOWID", buf, 1);
1233
1234         signal(SIGCHLD, SIG_DFL);
1235         signal(SIGHUP, SIG_DFL);
1236         signal(SIGINT, SIG_DFL);
1237         signal(SIGQUIT, SIG_DFL);
1238         signal(SIGTERM, SIG_DFL);
1239         signal(SIGALRM, SIG_DFL);
1240
1241         execvp(prog, args);
1242         _exit(EXIT_FAILURE);
1243 }
1244
1245 void
1246 sigchld(int a) {
1247         int stat, ret;
1248
1249         if(waitpid(pid, &stat, 0) < 0)
1250                 die("Waiting for pid %hd failed: %s\n", pid, strerror(errno));
1251
1252         ret = WIFEXITED(stat) ? WEXITSTATUS(stat) : EXIT_FAILURE;
1253         if (ret != EXIT_SUCCESS)
1254                 die("child finished with error '%d'\n", stat);
1255         exit(EXIT_SUCCESS);
1256 }
1257
1258
1259 void
1260 stty(void)
1261 {
1262         char cmd[_POSIX_ARG_MAX], **p, *q, *s;
1263         size_t n, siz;
1264
1265         if((n = strlen(stty_args)) > sizeof(cmd)-1)
1266                 die("incorrect stty parameters\n");
1267         memcpy(cmd, stty_args, n);
1268         q = cmd + n;
1269         siz = sizeof(cmd) - n;
1270         for(p = opt_cmd; p && (s = *p); ++p) {
1271                 if((n = strlen(s)) > siz-1)
1272                         die("stty parameter length too long\n");
1273                 *q++ = ' ';
1274                 q = memcpy(q, s, n);
1275                 q += n;
1276                 siz-= n + 1;
1277         }
1278         *q = '\0';
1279         system(cmd);
1280 }
1281
1282 void
1283 ttynew(void) {
1284         int m, s;
1285         struct winsize w = {term.row, term.col, 0, 0};
1286
1287         if(opt_io) {
1288                 term.mode |= MODE_PRINT;
1289                 iofd = (!strcmp(opt_io, "-")) ?
1290                           STDOUT_FILENO :
1291                           open(opt_io, O_WRONLY | O_CREAT, 0666);
1292                 if(iofd < 0) {
1293                         fprintf(stderr, "Error opening %s:%s\n",
1294                                 opt_io, strerror(errno));
1295                 }
1296         }
1297
1298         if (opt_line) {
1299                 if((cmdfd = open(opt_line, O_RDWR)) < 0)
1300                         die("open line failed: %s\n", strerror(errno));
1301                 close(STDIN_FILENO);
1302                 dup(cmdfd);
1303                 stty();
1304                 return;
1305         }
1306
1307         /* seems to work fine on linux, openbsd and freebsd */
1308         if(openpty(&m, &s, NULL, NULL, &w) < 0)
1309                 die("openpty failed: %s\n", strerror(errno));
1310
1311         switch(pid = fork()) {
1312         case -1:
1313                 die("fork failed\n");
1314                 break;
1315         case 0:
1316                 close(iofd);
1317                 setsid(); /* create a new process group */
1318                 dup2(s, STDIN_FILENO);
1319                 dup2(s, STDOUT_FILENO);
1320                 dup2(s, STDERR_FILENO);
1321                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
1322                         die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
1323                 close(s);
1324                 close(m);
1325                 execsh();
1326                 break;
1327         default:
1328                 close(s);
1329                 cmdfd = m;
1330                 signal(SIGCHLD, sigchld);
1331                 break;
1332         }
1333 }
1334
1335 void
1336 ttyread(void) {
1337         static char buf[BUFSIZ];
1338         static int buflen = 0;
1339         char *ptr;
1340         char s[UTF_SIZ];
1341         int charsize; /* size of utf8 char in bytes */
1342         long unicodep;
1343         int ret;
1344
1345         /* append read bytes to unprocessed bytes */
1346         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
1347                 die("Couldn't read from shell: %s\n", strerror(errno));
1348
1349         /* process every complete utf8 char */
1350         buflen += ret;
1351         ptr = buf;
1352         while((charsize = utf8decode(ptr, &unicodep, buflen))) {
1353                 utf8encode(unicodep, s, UTF_SIZ);
1354                 tputc(s, charsize);
1355                 ptr += charsize;
1356                 buflen -= charsize;
1357         }
1358
1359         /* keep any uncomplete utf8 char for the next call */
1360         memmove(buf, ptr, buflen);
1361 }
1362
1363 void
1364 ttywrite(const char *s, size_t n) {
1365         if(xwrite(cmdfd, s, n) == -1)
1366                 die("write error on tty: %s\n", strerror(errno));
1367 }
1368
1369 void
1370 ttysend(char *s, size_t n) {
1371         ttywrite(s, n);
1372         if(IS_SET(MODE_ECHO))
1373                 techo(s, n);
1374 }
1375
1376 void
1377 ttyresize(void) {
1378         struct winsize w;
1379
1380         w.ws_row = term.row;
1381         w.ws_col = term.col;
1382         w.ws_xpixel = xw.tw;
1383         w.ws_ypixel = xw.th;
1384         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
1385                 fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
1386 }
1387
1388 int
1389 tattrset(int attr) {
1390         int i, j;
1391
1392         for(i = 0; i < term.row-1; i++) {
1393                 for(j = 0; j < term.col-1; j++) {
1394                         if(term.line[i][j].mode & attr)
1395                                 return 1;
1396                 }
1397         }
1398
1399         return 0;
1400 }
1401
1402 void
1403 tsetdirt(int top, int bot) {
1404         int i;
1405
1406         LIMIT(top, 0, term.row-1);
1407         LIMIT(bot, 0, term.row-1);
1408
1409         for(i = top; i <= bot; i++)
1410                 term.dirty[i] = 1;
1411 }
1412
1413 void
1414 tsetdirtattr(int attr) {
1415         int i, j;
1416
1417         for(i = 0; i < term.row-1; i++) {
1418                 for(j = 0; j < term.col-1; j++) {
1419                         if(term.line[i][j].mode & attr) {
1420                                 tsetdirt(i, i);
1421                                 break;
1422                         }
1423                 }
1424         }
1425 }
1426
1427 void
1428 tfulldirt(void) {
1429         tsetdirt(0, term.row-1);
1430 }
1431
1432 void
1433 tcursor(int mode) {
1434         static TCursor c[2];
1435         bool alt = IS_SET(MODE_ALTSCREEN);
1436
1437         if(mode == CURSOR_SAVE) {
1438                 c[alt] = term.c;
1439         } else if(mode == CURSOR_LOAD) {
1440                 term.c = c[alt];
1441                 tmoveto(c[alt].x, c[alt].y);
1442         }
1443 }
1444
1445 void
1446 treset(void) {
1447         uint i;
1448
1449         term.c = (TCursor){{
1450                 .mode = ATTR_NULL,
1451                 .fg = defaultfg,
1452                 .bg = defaultbg
1453         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
1454
1455         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1456         for(i = tabspaces; i < term.col; i += tabspaces)
1457                 term.tabs[i] = 1;
1458         term.top = 0;
1459         term.bot = term.row - 1;
1460         term.mode = MODE_WRAP;
1461         memset(term.trantbl, sizeof(term.trantbl), CS_USA);
1462         term.charset = 0;
1463
1464         for(i = 0; i < 2; i++) {
1465                 tmoveto(0, 0);
1466                 tcursor(CURSOR_SAVE);
1467                 tclearregion(0, 0, term.col-1, term.row-1);
1468                 tswapscreen();
1469         }
1470 }
1471
1472 void
1473 tnew(int col, int row) {
1474         term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
1475         tresize(col, row);
1476         term.numlock = 1;
1477
1478         treset();
1479 }
1480
1481 void
1482 tswapscreen(void) {
1483         Line *tmp = term.line;
1484
1485         term.line = term.alt;
1486         term.alt = tmp;
1487         term.mode ^= MODE_ALTSCREEN;
1488         tfulldirt();
1489 }
1490
1491 void
1492 tscrolldown(int orig, int n) {
1493         int i;
1494         Line temp;
1495
1496         LIMIT(n, 0, term.bot-orig+1);
1497
1498         tsetdirt(orig, term.bot-n);
1499         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
1500
1501         for(i = term.bot; i >= orig+n; i--) {
1502                 temp = term.line[i];
1503                 term.line[i] = term.line[i-n];
1504                 term.line[i-n] = temp;
1505         }
1506
1507         selscroll(orig, n);
1508 }
1509
1510 void
1511 tscrollup(int orig, int n) {
1512         int i;
1513         Line temp;
1514
1515         LIMIT(n, 0, term.bot-orig+1);
1516
1517         tclearregion(0, orig, term.col-1, orig+n-1);
1518         tsetdirt(orig+n, term.bot);
1519
1520         for(i = orig; i <= term.bot-n; i++) {
1521                 temp = term.line[i];
1522                 term.line[i] = term.line[i+n];
1523                 term.line[i+n] = temp;
1524         }
1525
1526         selscroll(orig, -n);
1527 }
1528
1529 void
1530 selscroll(int orig, int n) {
1531         if(sel.ob.x == -1)
1532                 return;
1533
1534         if(BETWEEN(sel.ob.y, orig, term.bot) || BETWEEN(sel.oe.y, orig, term.bot)) {
1535                 if((sel.ob.y += n) > term.bot || (sel.oe.y += n) < term.top) {
1536                         selclear(NULL);
1537                         return;
1538                 }
1539                 if(sel.type == SEL_RECTANGULAR) {
1540                         if(sel.ob.y < term.top)
1541                                 sel.ob.y = term.top;
1542                         if(sel.oe.y > term.bot)
1543                                 sel.oe.y = term.bot;
1544                 } else {
1545                         if(sel.ob.y < term.top) {
1546                                 sel.ob.y = term.top;
1547                                 sel.ob.x = 0;
1548                         }
1549                         if(sel.oe.y > term.bot) {
1550                                 sel.oe.y = term.bot;
1551                                 sel.oe.x = term.col;
1552                         }
1553                 }
1554                 selnormalize();
1555         }
1556 }
1557
1558 void
1559 tnewline(int first_col) {
1560         int y = term.c.y;
1561
1562         if(y == term.bot) {
1563                 tscrollup(term.top, 1);
1564         } else {
1565                 y++;
1566         }
1567         tmoveto(first_col ? 0 : term.c.x, y);
1568 }
1569
1570 void
1571 csiparse(void) {
1572         char *p = csiescseq.buf, *np;
1573         long int v;
1574
1575         csiescseq.narg = 0;
1576         if(*p == '?') {
1577                 csiescseq.priv = 1;
1578                 p++;
1579         }
1580
1581         csiescseq.buf[csiescseq.len] = '\0';
1582         while(p < csiescseq.buf+csiescseq.len) {
1583                 np = NULL;
1584                 v = strtol(p, &np, 10);
1585                 if(np == p)
1586                         v = 0;
1587                 if(v == LONG_MAX || v == LONG_MIN)
1588                         v = -1;
1589                 csiescseq.arg[csiescseq.narg++] = v;
1590                 p = np;
1591                 if(*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
1592                         break;
1593                 p++;
1594         }
1595         csiescseq.mode[0] = *p++;
1596         csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
1597 }
1598
1599 /* for absolute user moves, when decom is set */
1600 void
1601 tmoveato(int x, int y) {
1602         tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
1603 }
1604
1605 void
1606 tmoveto(int x, int y) {
1607         int miny, maxy;
1608
1609         if(term.c.state & CURSOR_ORIGIN) {
1610                 miny = term.top;
1611                 maxy = term.bot;
1612         } else {
1613                 miny = 0;
1614                 maxy = term.row - 1;
1615         }
1616         term.c.state &= ~CURSOR_WRAPNEXT;
1617         term.c.x = LIMIT(x, 0, term.col-1);
1618         term.c.y = LIMIT(y, miny, maxy);
1619 }
1620
1621 void
1622 tsetchar(char *c, Glyph *attr, int x, int y) {
1623         static char *vt100_0[62] = { /* 0x41 - 0x7e */
1624                 "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
1625                 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
1626                 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
1627                 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
1628                 "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
1629                 "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
1630                 "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
1631                 "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
1632         };
1633
1634         /*
1635          * The table is proudly stolen from rxvt.
1636          */
1637         if(term.trantbl[term.charset] == CS_GRAPHIC0) {
1638                 if(BETWEEN(c[0], 0x41, 0x7e) && vt100_0[c[0] - 0x41]) {
1639                         c = vt100_0[c[0] - 0x41];
1640                 }
1641         }
1642
1643         if(term.line[y][x].mode & ATTR_WIDE) {
1644                 if(x+1 < term.col) {
1645                         term.line[y][x+1].c[0] = ' ';
1646                         term.line[y][x+1].mode &= ~ATTR_WDUMMY;
1647                 }
1648         } else if(term.line[y][x].mode & ATTR_WDUMMY) {
1649                 term.line[y][x-1].c[0] = ' ';
1650                 term.line[y][x-1].mode &= ~ATTR_WIDE;
1651         }
1652
1653         term.dirty[y] = 1;
1654         term.line[y][x] = *attr;
1655         memcpy(term.line[y][x].c, c, UTF_SIZ);
1656 }
1657
1658 void
1659 tclearregion(int x1, int y1, int x2, int y2) {
1660         int x, y, temp;
1661         Glyph *gp;
1662
1663         if(x1 > x2)
1664                 temp = x1, x1 = x2, x2 = temp;
1665         if(y1 > y2)
1666                 temp = y1, y1 = y2, y2 = temp;
1667
1668         LIMIT(x1, 0, term.col-1);
1669         LIMIT(x2, 0, term.col-1);
1670         LIMIT(y1, 0, term.row-1);
1671         LIMIT(y2, 0, term.row-1);
1672
1673         for(y = y1; y <= y2; y++) {
1674                 term.dirty[y] = 1;
1675                 for(x = x1; x <= x2; x++) {
1676                         gp = &term.line[y][x];
1677                         if(selected(x, y))
1678                                 selclear(NULL);
1679                         gp->fg = term.c.attr.fg;
1680                         gp->bg = term.c.attr.bg;
1681                         gp->mode = 0;
1682                         memcpy(gp->c, " ", 2);
1683                 }
1684         }
1685 }
1686
1687 void
1688 tdeletechar(int n) {
1689         int dst, src, size;
1690         Glyph *line;
1691
1692         LIMIT(n, 0, term.col - term.c.x);
1693
1694         dst = term.c.x;
1695         src = term.c.x + n;
1696         size = term.col - src;
1697         line = term.line[term.c.y];
1698
1699         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1700         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1701 }
1702
1703 void
1704 tinsertblank(int n) {
1705         int dst, src, size;
1706         Glyph *line;
1707
1708         LIMIT(n, 0, term.col - term.c.x);
1709
1710         dst = term.c.x + n;
1711         src = term.c.x;
1712         size = term.col - dst;
1713         line = term.line[term.c.y];
1714
1715         memmove(&line[dst], &line[src], size * sizeof(Glyph));
1716         tclearregion(src, term.c.y, dst - 1, term.c.y);
1717 }
1718
1719 void
1720 tinsertblankline(int n) {
1721         if(BETWEEN(term.c.y, term.top, term.bot))
1722                 tscrolldown(term.c.y, n);
1723 }
1724
1725 void
1726 tdeleteline(int n) {
1727         if(BETWEEN(term.c.y, term.top, term.bot))
1728                 tscrollup(term.c.y, n);
1729 }
1730
1731 int32_t
1732 tdefcolor(int *attr, int *npar, int l) {
1733         int32_t idx = -1;
1734         uint r, g, b;
1735
1736         switch (attr[*npar + 1]) {
1737         case 2: /* direct color in RGB space */
1738                 if (*npar + 4 >= l) {
1739                         fprintf(stderr,
1740                                 "erresc(38): Incorrect number of parameters (%d)\n",
1741                                 *npar);
1742                         break;
1743                 }
1744                 r = attr[*npar + 2];
1745                 g = attr[*npar + 3];
1746                 b = attr[*npar + 4];
1747                 *npar += 4;
1748                 if(!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
1749                         fprintf(stderr, "erresc: bad rgb color (%d,%d,%d)\n",
1750                                 r, g, b);
1751                 else
1752                         idx = TRUECOLOR(r, g, b);
1753                 break;
1754         case 5: /* indexed color */
1755                 if (*npar + 2 >= l) {
1756                         fprintf(stderr,
1757                                 "erresc(38): Incorrect number of parameters (%d)\n",
1758                                 *npar);
1759                         break;
1760                 }
1761                 *npar += 2;
1762                 if(!BETWEEN(attr[*npar], 0, 255))
1763                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
1764                 else
1765                         idx = attr[*npar];
1766                 break;
1767         case 0: /* implemented defined (only foreground) */
1768         case 1: /* transparent */
1769         case 3: /* direct color in CMY space */
1770         case 4: /* direct color in CMYK space */
1771         default:
1772                 fprintf(stderr,
1773                         "erresc(38): gfx attr %d unknown\n", attr[*npar]);
1774                 break;
1775         }
1776
1777         return idx;
1778 }
1779
1780 void
1781 tsetattr(int *attr, int l) {
1782         int i;
1783         int32_t idx;
1784
1785         for(i = 0; i < l; i++) {
1786                 switch(attr[i]) {
1787                 case 0:
1788                         term.c.attr.mode &= ~(
1789                                 ATTR_BOLD       |
1790                                 ATTR_FAINT      |
1791                                 ATTR_ITALIC     |
1792                                 ATTR_UNDERLINE  |
1793                                 ATTR_BLINK      |
1794                                 ATTR_REVERSE    |
1795                                 ATTR_INVISIBLE  |
1796                                 ATTR_STRUCK     );
1797                         term.c.attr.fg = defaultfg;
1798                         term.c.attr.bg = defaultbg;
1799                         break;
1800                 case 1:
1801                         term.c.attr.mode |= ATTR_BOLD;
1802                         break;
1803                 case 2:
1804                         term.c.attr.mode |= ATTR_FAINT;
1805                         break;
1806                 case 3:
1807                         term.c.attr.mode |= ATTR_ITALIC;
1808                         break;
1809                 case 4:
1810                         term.c.attr.mode |= ATTR_UNDERLINE;
1811                         break;
1812                 case 5: /* slow blink */
1813                         /* FALLTHROUGH */
1814                 case 6: /* rapid blink */
1815                         term.c.attr.mode |= ATTR_BLINK;
1816                         break;
1817                 case 7:
1818                         term.c.attr.mode |= ATTR_REVERSE;
1819                         break;
1820                 case 8:
1821                         term.c.attr.mode |= ATTR_INVISIBLE;
1822                         break;
1823                 case 9:
1824                         term.c.attr.mode |= ATTR_STRUCK;
1825                         break;
1826                 case 22:
1827                         term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
1828                         break;
1829                 case 23:
1830                         term.c.attr.mode &= ~ATTR_ITALIC;
1831                         break;
1832                 case 24:
1833                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1834                         break;
1835                 case 25:
1836                         term.c.attr.mode &= ~ATTR_BLINK;
1837                         break;
1838                 case 27:
1839                         term.c.attr.mode &= ~ATTR_REVERSE;
1840                         break;
1841                 case 28:
1842                         term.c.attr.mode &= ~ATTR_INVISIBLE;
1843                         break;
1844                 case 29:
1845                         term.c.attr.mode &= ~ATTR_STRUCK;
1846                         break;
1847                 case 38:
1848                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1849                                 term.c.attr.fg = idx;
1850                         break;
1851                 case 39:
1852                         term.c.attr.fg = defaultfg;
1853                         break;
1854                 case 48:
1855                         if ((idx = tdefcolor(attr, &i, l)) >= 0)
1856                                 term.c.attr.bg = idx;
1857                         break;
1858                 case 49:
1859                         term.c.attr.bg = defaultbg;
1860                         break;
1861                 default:
1862                         if(BETWEEN(attr[i], 30, 37)) {
1863                                 term.c.attr.fg = attr[i] - 30;
1864                         } else if(BETWEEN(attr[i], 40, 47)) {
1865                                 term.c.attr.bg = attr[i] - 40;
1866                         } else if(BETWEEN(attr[i], 90, 97)) {
1867                                 term.c.attr.fg = attr[i] - 90 + 8;
1868                         } else if(BETWEEN(attr[i], 100, 107)) {
1869                                 term.c.attr.bg = attr[i] - 100 + 8;
1870                         } else {
1871                                 fprintf(stderr,
1872                                         "erresc(default): gfx attr %d unknown\n",
1873                                         attr[i]), csidump();
1874                         }
1875                         break;
1876                 }
1877         }
1878 }
1879
1880 void
1881 tsetscroll(int t, int b) {
1882         int temp;
1883
1884         LIMIT(t, 0, term.row-1);
1885         LIMIT(b, 0, term.row-1);
1886         if(t > b) {
1887                 temp = t;
1888                 t = b;
1889                 b = temp;
1890         }
1891         term.top = t;
1892         term.bot = b;
1893 }
1894
1895 void
1896 tsetmode(bool priv, bool set, int *args, int narg) {
1897         int *lim, mode;
1898         bool alt;
1899
1900         for(lim = args + narg; args < lim; ++args) {
1901                 if(priv) {
1902                         switch(*args) {
1903                         case 1: /* DECCKM -- Cursor key */
1904                                 MODBIT(term.mode, set, MODE_APPCURSOR);
1905                                 break;
1906                         case 5: /* DECSCNM -- Reverse video */
1907                                 mode = term.mode;
1908                                 MODBIT(term.mode, set, MODE_REVERSE);
1909                                 if(mode != term.mode)
1910                                         redraw();
1911                                 break;
1912                         case 6: /* DECOM -- Origin */
1913                                 MODBIT(term.c.state, set, CURSOR_ORIGIN);
1914                                 tmoveato(0, 0);
1915                                 break;
1916                         case 7: /* DECAWM -- Auto wrap */
1917                                 MODBIT(term.mode, set, MODE_WRAP);
1918                                 break;
1919                         case 0:  /* Error (IGNORED) */
1920                         case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
1921                         case 3:  /* DECCOLM -- Column  (IGNORED) */
1922                         case 4:  /* DECSCLM -- Scroll (IGNORED) */
1923                         case 8:  /* DECARM -- Auto repeat (IGNORED) */
1924                         case 18: /* DECPFF -- Printer feed (IGNORED) */
1925                         case 19: /* DECPEX -- Printer extent (IGNORED) */
1926                         case 42: /* DECNRCM -- National characters (IGNORED) */
1927                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1928                                 break;
1929                         case 25: /* DECTCEM -- Text Cursor Enable Mode */
1930                                 MODBIT(term.mode, !set, MODE_HIDE);
1931                                 break;
1932                         case 9:    /* X10 mouse compatibility mode */
1933                                 xsetpointermotion(0);
1934                                 MODBIT(term.mode, 0, MODE_MOUSE);
1935                                 MODBIT(term.mode, set, MODE_MOUSEX10);
1936                                 break;
1937                         case 1000: /* 1000: report button press */
1938                                 xsetpointermotion(0);
1939                                 MODBIT(term.mode, 0, MODE_MOUSE);
1940                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1941                                 break;
1942                         case 1002: /* 1002: report motion on button press */
1943                                 xsetpointermotion(0);
1944                                 MODBIT(term.mode, 0, MODE_MOUSE);
1945                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1946                                 break;
1947                         case 1003: /* 1003: enable all mouse motions */
1948                                 xsetpointermotion(set);
1949                                 MODBIT(term.mode, 0, MODE_MOUSE);
1950                                 MODBIT(term.mode, set, MODE_MOUSEMANY);
1951                                 break;
1952                         case 1004: /* 1004: send focus events to tty */
1953                                 MODBIT(term.mode, set, MODE_FOCUS);
1954                                 break;
1955                         case 1006: /* 1006: extended reporting mode */
1956                                 MODBIT(term.mode, set, MODE_MOUSESGR);
1957                                 break;
1958                         case 1034:
1959                                 MODBIT(term.mode, set, MODE_8BIT);
1960                                 break;
1961                         case 1049: /* swap screen & set/restore cursor as xterm */
1962                                 if (!allowaltscreen)
1963                                         break;
1964                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1965                                 /* FALLTHROUGH */
1966                         case 47: /* swap screen */
1967                         case 1047:
1968                                 if (!allowaltscreen)
1969                                         break;
1970                                 alt = IS_SET(MODE_ALTSCREEN);
1971                                 if(alt) {
1972                                         tclearregion(0, 0, term.col-1,
1973                                                         term.row-1);
1974                                 }
1975                                 if(set ^ alt) /* set is always 1 or 0 */
1976                                         tswapscreen();
1977                                 if(*args != 1049)
1978                                         break;
1979                                 /* FALLTHROUGH */
1980                         case 1048:
1981                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1982                                 break;
1983                         case 2004: /* 2004: bracketed paste mode */
1984                                 MODBIT(term.mode, set, MODE_BRCKTPASTE);
1985                                 break;
1986                         /* Not implemented mouse modes. See comments there. */
1987                         case 1001: /* mouse highlight mode; can hang the
1988                                       terminal by design when implemented. */
1989                         case 1005: /* UTF-8 mouse mode; will confuse
1990                                       applications not supporting UTF-8
1991                                       and luit. */
1992                         case 1015: /* urxvt mangled mouse mode; incompatible
1993                                       and can be mistaken for other control
1994                                       codes. */
1995                         default:
1996                                 fprintf(stderr,
1997                                         "erresc: unknown private set/reset mode %d\n",
1998                                         *args);
1999                                 break;
2000                         }
2001                 } else {
2002                         switch(*args) {
2003                         case 0:  /* Error (IGNORED) */
2004                                 break;
2005                         case 2:  /* KAM -- keyboard action */
2006                                 MODBIT(term.mode, set, MODE_KBDLOCK);
2007                                 break;
2008                         case 4:  /* IRM -- Insertion-replacement */
2009                                 MODBIT(term.mode, set, MODE_INSERT);
2010                                 break;
2011                         case 12: /* SRM -- Send/Receive */
2012                                 MODBIT(term.mode, !set, MODE_ECHO);
2013                                 break;
2014                         case 20: /* LNM -- Linefeed/new line */
2015                                 MODBIT(term.mode, set, MODE_CRLF);
2016                                 break;
2017                         default:
2018                                 fprintf(stderr,
2019                                         "erresc: unknown set/reset mode %d\n",
2020                                         *args);
2021                                 break;
2022                         }
2023                 }
2024         }
2025 }
2026
2027 void
2028 csihandle(void) {
2029         char buf[40];
2030         int len;
2031
2032         switch(csiescseq.mode[0]) {
2033         default:
2034         unknown:
2035                 fprintf(stderr, "erresc: unknown csi ");
2036                 csidump();
2037                 /* die(""); */
2038                 break;
2039         case '@': /* ICH -- Insert <n> blank char */
2040                 DEFAULT(csiescseq.arg[0], 1);
2041                 tinsertblank(csiescseq.arg[0]);
2042                 break;
2043         case 'A': /* CUU -- Cursor <n> Up */
2044                 DEFAULT(csiescseq.arg[0], 1);
2045                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
2046                 break;
2047         case 'B': /* CUD -- Cursor <n> Down */
2048         case 'e': /* VPR --Cursor <n> Down */
2049                 DEFAULT(csiescseq.arg[0], 1);
2050                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
2051                 break;
2052         case 'i': /* MC -- Media Copy */
2053                 switch(csiescseq.arg[0]) {
2054                 case 0:
2055                         tdump();
2056                         break;
2057                 case 1:
2058                         tdumpline(term.c.y);
2059                         break;
2060                 case 2:
2061                         tdumpsel();
2062                         break;
2063                 case 4:
2064                         term.mode &= ~MODE_PRINT;
2065                         break;
2066                 case 5:
2067                         term.mode |= MODE_PRINT;
2068                         break;
2069                 }
2070                 break;
2071         case 'c': /* DA -- Device Attributes */
2072                 if(csiescseq.arg[0] == 0)
2073                         ttywrite(vtiden, sizeof(vtiden) - 1);
2074                 break;
2075         case 'C': /* CUF -- Cursor <n> Forward */
2076         case 'a': /* HPR -- Cursor <n> Forward */
2077                 DEFAULT(csiescseq.arg[0], 1);
2078                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
2079                 break;
2080         case 'D': /* CUB -- Cursor <n> Backward */
2081                 DEFAULT(csiescseq.arg[0], 1);
2082                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
2083                 break;
2084         case 'E': /* CNL -- Cursor <n> Down and first col */
2085                 DEFAULT(csiescseq.arg[0], 1);
2086                 tmoveto(0, term.c.y+csiescseq.arg[0]);
2087                 break;
2088         case 'F': /* CPL -- Cursor <n> Up and first col */
2089                 DEFAULT(csiescseq.arg[0], 1);
2090                 tmoveto(0, term.c.y-csiescseq.arg[0]);
2091                 break;
2092         case 'g': /* TBC -- Tabulation clear */
2093                 switch(csiescseq.arg[0]) {
2094                 case 0: /* clear current tab stop */
2095                         term.tabs[term.c.x] = 0;
2096                         break;
2097                 case 3: /* clear all the tabs */
2098                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
2099                         break;
2100                 default:
2101                         goto unknown;
2102                 }
2103                 break;
2104         case 'G': /* CHA -- Move to <col> */
2105         case '`': /* HPA */
2106                 DEFAULT(csiescseq.arg[0], 1);
2107                 tmoveto(csiescseq.arg[0]-1, term.c.y);
2108                 break;
2109         case 'H': /* CUP -- Move to <row> <col> */
2110         case 'f': /* HVP */
2111                 DEFAULT(csiescseq.arg[0], 1);
2112                 DEFAULT(csiescseq.arg[1], 1);
2113                 tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
2114                 break;
2115         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
2116                 DEFAULT(csiescseq.arg[0], 1);
2117                 tputtab(csiescseq.arg[0]);
2118                 break;
2119         case 'J': /* ED -- Clear screen */
2120                 selclear(NULL);
2121                 switch(csiescseq.arg[0]) {
2122                 case 0: /* below */
2123                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
2124                         if(term.c.y < term.row-1) {
2125                                 tclearregion(0, term.c.y+1, term.col-1,
2126                                                 term.row-1);
2127                         }
2128                         break;
2129                 case 1: /* above */
2130                         if(term.c.y > 1)
2131                                 tclearregion(0, 0, term.col-1, term.c.y-1);
2132                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2133                         break;
2134                 case 2: /* all */
2135                         tclearregion(0, 0, term.col-1, term.row-1);
2136                         break;
2137                 default:
2138                         goto unknown;
2139                 }
2140                 break;
2141         case 'K': /* EL -- Clear line */
2142                 switch(csiescseq.arg[0]) {
2143                 case 0: /* right */
2144                         tclearregion(term.c.x, term.c.y, term.col-1,
2145                                         term.c.y);
2146                         break;
2147                 case 1: /* left */
2148                         tclearregion(0, term.c.y, term.c.x, term.c.y);
2149                         break;
2150                 case 2: /* all */
2151                         tclearregion(0, term.c.y, term.col-1, term.c.y);
2152                         break;
2153                 }
2154                 break;
2155         case 'S': /* SU -- Scroll <n> line up */
2156                 DEFAULT(csiescseq.arg[0], 1);
2157                 tscrollup(term.top, csiescseq.arg[0]);
2158                 break;
2159         case 'T': /* SD -- Scroll <n> line down */
2160                 DEFAULT(csiescseq.arg[0], 1);
2161                 tscrolldown(term.top, csiescseq.arg[0]);
2162                 break;
2163         case 'L': /* IL -- Insert <n> blank lines */
2164                 DEFAULT(csiescseq.arg[0], 1);
2165                 tinsertblankline(csiescseq.arg[0]);
2166                 break;
2167         case 'l': /* RM -- Reset Mode */
2168                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
2169                 break;
2170         case 'M': /* DL -- Delete <n> lines */
2171                 DEFAULT(csiescseq.arg[0], 1);
2172                 tdeleteline(csiescseq.arg[0]);
2173                 break;
2174         case 'X': /* ECH -- Erase <n> char */
2175                 DEFAULT(csiescseq.arg[0], 1);
2176                 tclearregion(term.c.x, term.c.y,
2177                                 term.c.x + csiescseq.arg[0] - 1, term.c.y);
2178                 break;
2179         case 'P': /* DCH -- Delete <n> char */
2180                 DEFAULT(csiescseq.arg[0], 1);
2181                 tdeletechar(csiescseq.arg[0]);
2182                 break;
2183         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
2184                 DEFAULT(csiescseq.arg[0], 1);
2185                 tputtab(-csiescseq.arg[0]);
2186                 break;
2187         case 'd': /* VPA -- Move to <row> */
2188                 DEFAULT(csiescseq.arg[0], 1);
2189                 tmoveato(term.c.x, csiescseq.arg[0]-1);
2190                 break;
2191         case 'h': /* SM -- Set terminal mode */
2192                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
2193                 break;
2194         case 'm': /* SGR -- Terminal attribute (color) */
2195                 tsetattr(csiescseq.arg, csiescseq.narg);
2196                 break;
2197         case 'n': /* DSR – Device Status Report (cursor position) */
2198                 if (csiescseq.arg[0] == 6) {
2199                         len = snprintf(buf, sizeof(buf),"\033[%i;%iR",
2200                                         term.c.y+1, term.c.x+1);
2201                         ttywrite(buf, len);
2202                 }
2203                 break;
2204         case 'r': /* DECSTBM -- Set Scrolling Region */
2205                 if(csiescseq.priv) {
2206                         goto unknown;
2207                 } else {
2208                         DEFAULT(csiescseq.arg[0], 1);
2209                         DEFAULT(csiescseq.arg[1], term.row);
2210                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
2211                         tmoveato(0, 0);
2212                 }
2213                 break;
2214         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
2215                 tcursor(CURSOR_SAVE);
2216                 break;
2217         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
2218                 tcursor(CURSOR_LOAD);
2219                 break;
2220         case ' ':
2221                 switch (csiescseq.mode[1]) {
2222                         case 'q': /* DECSCUSR -- Set Cursor Style */
2223                                 DEFAULT(csiescseq.arg[0], 1);
2224                                 if (!BETWEEN(csiescseq.arg[0], 0, 6)) {
2225                                         goto unknown;
2226                                 }
2227                                 xw.cursor = csiescseq.arg[0];
2228                                 break;
2229                         default:
2230                                 goto unknown;
2231                 }
2232                 break;
2233         }
2234 }
2235
2236 void
2237 csidump(void) {
2238         int i;
2239         uint c;
2240
2241         printf("ESC[");
2242         for(i = 0; i < csiescseq.len; i++) {
2243                 c = csiescseq.buf[i] & 0xff;
2244                 if(isprint(c)) {
2245                         putchar(c);
2246                 } else if(c == '\n') {
2247                         printf("(\\n)");
2248                 } else if(c == '\r') {
2249                         printf("(\\r)");
2250                 } else if(c == 0x1b) {
2251                         printf("(\\e)");
2252                 } else {
2253                         printf("(%02x)", c);
2254                 }
2255         }
2256         putchar('\n');
2257 }
2258
2259 void
2260 csireset(void) {
2261         memset(&csiescseq, 0, sizeof(csiescseq));
2262 }
2263
2264 void
2265 strhandle(void) {
2266         char *p = NULL;
2267         int j, narg, par;
2268
2269         term.esc &= ~(ESC_STR_END|ESC_STR);
2270         strparse();
2271         narg = strescseq.narg;
2272         par = atoi(strescseq.args[0]);
2273
2274         switch(strescseq.type) {
2275         case ']': /* OSC -- Operating System Command */
2276                 switch(par) {
2277                 case 0:
2278                 case 1:
2279                 case 2:
2280                         if(narg > 1)
2281                                 xsettitle(strescseq.args[1]);
2282                         return;
2283                 case 4: /* color set */
2284                         if(narg < 3)
2285                                 break;
2286                         p = strescseq.args[2];
2287                         /* FALLTHROUGH */
2288                 case 104: /* color reset, here p = NULL */
2289                         j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
2290                         if(xsetcolorname(j, p)) {
2291                                 fprintf(stderr, "erresc: invalid color %s\n", p);
2292                         } else {
2293                                 /*
2294                                  * TODO if defaultbg color is changed, borders
2295                                  * are dirty
2296                                  */
2297                                 redraw();
2298                         }
2299                         return;
2300                 }
2301                 break;
2302         case 'k': /* old title set compatibility */
2303                 xsettitle(strescseq.args[0]);
2304                 return;
2305         case 'P': /* DCS -- Device Control String */
2306         case '_': /* APC -- Application Program Command */
2307         case '^': /* PM -- Privacy Message */
2308                 return;
2309         }
2310
2311         fprintf(stderr, "erresc: unknown str ");
2312         strdump();
2313 }
2314
2315 void
2316 strparse(void) {
2317         int c;
2318         char *p = strescseq.buf;
2319
2320         strescseq.narg = 0;
2321         strescseq.buf[strescseq.len] = '\0';
2322
2323         if(*p == '\0')
2324                 return;
2325
2326         while(strescseq.narg < STR_ARG_SIZ) {
2327                 strescseq.args[strescseq.narg++] = p;
2328                 while((c = *p) != ';' && c != '\0')
2329                         ++p;
2330                 if(c == '\0')
2331                         return;
2332                 *p++ = '\0';
2333         }
2334 }
2335
2336 void
2337 strdump(void) {
2338         int i;
2339         uint c;
2340
2341         printf("ESC%c", strescseq.type);
2342         for(i = 0; i < strescseq.len; i++) {
2343                 c = strescseq.buf[i] & 0xff;
2344                 if(c == '\0') {
2345                         return;
2346                 } else if(isprint(c)) {
2347                         putchar(c);
2348                 } else if(c == '\n') {
2349                         printf("(\\n)");
2350                 } else if(c == '\r') {
2351                         printf("(\\r)");
2352                 } else if(c == 0x1b) {
2353                         printf("(\\e)");
2354                 } else {
2355                         printf("(%02x)", c);
2356                 }
2357         }
2358         printf("ESC\\\n");
2359 }
2360
2361 void
2362 strreset(void) {
2363         memset(&strescseq, 0, sizeof(strescseq));
2364 }
2365
2366 void
2367 tprinter(char *s, size_t len) {
2368         if(iofd != -1 && xwrite(iofd, s, len) < 0) {
2369                 fprintf(stderr, "Error writing in %s:%s\n",
2370                         opt_io, strerror(errno));
2371                 close(iofd);
2372                 iofd = -1;
2373         }
2374 }
2375
2376 void
2377 toggleprinter(const Arg *arg) {
2378         term.mode ^= MODE_PRINT;
2379 }
2380
2381 void
2382 printscreen(const Arg *arg) {
2383         tdump();
2384 }
2385
2386 void
2387 printsel(const Arg *arg) {
2388         tdumpsel();
2389 }
2390
2391 void
2392 tdumpsel(void) {
2393         char *ptr;
2394
2395         if((ptr = getsel())) {
2396                 tprinter(ptr, strlen(ptr));
2397                 free(ptr);
2398         }
2399 }
2400
2401 void
2402 tdumpline(int n) {
2403         Glyph *bp, *end;
2404
2405         bp = &term.line[n][0];
2406         end = &bp[MIN(tlinelen(n), term.col) - 1];
2407         if(bp != end || bp->c[0] != ' ') {
2408                 for( ;bp <= end; ++bp)
2409                         tprinter(bp->c, utf8len(bp->c));
2410         }
2411         tprinter("\n", 1);
2412 }
2413
2414 void
2415 tdump(void) {
2416         int i;
2417
2418         for(i = 0; i < term.row; ++i)
2419                 tdumpline(i);
2420 }
2421
2422 void
2423 tputtab(int n) {
2424         uint x = term.c.x;
2425
2426         if(n > 0) {
2427                 while(x < term.col && n--)
2428                         for(++x; x < term.col && !term.tabs[x]; ++x)
2429                                 /* nothing */ ;
2430         } else if(n < 0) {
2431                 while(x > 0 && n++)
2432                         for(--x; x > 0 && !term.tabs[x]; --x)
2433                                 /* nothing */ ;
2434         }
2435         term.c.x = LIMIT(x, 0, term.col-1);
2436 }
2437
2438 void
2439 techo(char *buf, int len) {
2440         for(; len > 0; buf++, len--) {
2441                 char c = *buf;
2442
2443                 if(ISCONTROL((uchar) c)) { /* control code */
2444                         if(c & 0x80) {
2445                                 c &= 0x7f;
2446                                 tputc("^", 1);
2447                                 tputc("[", 1);
2448                         } else if(c != '\n' && c != '\r' && c != '\t') {
2449                                 c ^= 0x40;
2450                                 tputc("^", 1);
2451                         }
2452                         tputc(&c, 1);
2453                 } else {
2454                         break;
2455                 }
2456         }
2457         if(len)
2458                 tputc(buf, len);
2459 }
2460
2461 void
2462 tdeftran(char ascii) {
2463         static char cs[] = "0B";
2464         static int vcs[] = {CS_GRAPHIC0, CS_USA};
2465         char *p;
2466
2467         if((p = strchr(cs, ascii)) == NULL) {
2468                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
2469         } else {
2470                 term.trantbl[term.icharset] = vcs[p - cs];
2471         }
2472 }
2473
2474 void
2475 tdectest(char c) {
2476         static char E[UTF_SIZ] = "E";
2477         int x, y;
2478
2479         if(c == '8') { /* DEC screen alignment test. */
2480                 for(x = 0; x < term.col; ++x) {
2481                         for(y = 0; y < term.row; ++y)
2482                                 tsetchar(E, &term.c.attr, x, y);
2483                 }
2484         }
2485 }
2486
2487 void
2488 tstrsequence(uchar c) {
2489         switch (c) {
2490         case 0x90:   /* DCS -- Device Control String */
2491                 c = 'P';
2492                 break;
2493         case 0x9f:   /* APC -- Application Program Command */
2494                 c = '_';
2495                 break;
2496         case 0x9e:   /* PM -- Privacy Message */
2497                 c = '^';
2498                 break;
2499         case 0x9d:   /* OSC -- Operating System Command */
2500                 c = ']';
2501                 break;
2502         }
2503         strreset();
2504         strescseq.type = c;
2505         term.esc |= ESC_STR;
2506         return;
2507 }
2508
2509 void
2510 tcontrolcode(uchar ascii) {
2511         static char question[UTF_SIZ] = "?";
2512
2513         switch(ascii) {
2514         case '\t':   /* HT */
2515                 tputtab(1);
2516                 return;
2517         case '\b':   /* BS */
2518                 tmoveto(term.c.x-1, term.c.y);
2519                 return;
2520         case '\r':   /* CR */
2521                 tmoveto(0, term.c.y);
2522                 return;
2523         case '\f':   /* LF */
2524         case '\v':   /* VT */
2525         case '\n':   /* LF */
2526                 /* go to first col if the mode is set */
2527                 tnewline(IS_SET(MODE_CRLF));
2528                 return;
2529         case '\a':   /* BEL */
2530                 if(term.esc & ESC_STR_END) {
2531                         /* backwards compatibility to xterm */
2532                         strhandle();
2533                 } else {
2534                         if(!(xw.state & WIN_FOCUSED))
2535                                 xseturgency(1);
2536                         if (bellvolume)
2537                                 XkbBell(xw.dpy, xw.win, bellvolume, (Atom)NULL);
2538                 }
2539                 break;
2540         case '\033': /* ESC */
2541                 csireset();
2542                 term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
2543                 term.esc |= ESC_START;
2544                 return;
2545         case '\016': /* SO (LS1 -- Locking shift 1) */
2546         case '\017': /* SI (LS0 -- Locking shift 0) */
2547                 term.charset = 1 - (ascii - '\016');
2548                 return;
2549         case '\032': /* SUB */
2550                 tsetchar(question, &term.c.attr, term.c.x, term.c.y);
2551         case '\030': /* CAN */
2552                 csireset();
2553                 break;
2554         case '\005': /* ENQ (IGNORED) */
2555         case '\000': /* NUL (IGNORED) */
2556         case '\021': /* XON (IGNORED) */
2557         case '\023': /* XOFF (IGNORED) */
2558         case 0177:   /* DEL (IGNORED) */
2559                 return;
2560         case 0x84:   /* TODO: IND */
2561                 break;
2562         case 0x85:   /* NEL -- Next line */
2563                 tnewline(1); /* always go to first col */
2564                 break;
2565         case 0x88:   /* HTS -- Horizontal tab stop */
2566                 term.tabs[term.c.x] = 1;
2567                 break;
2568         case 0x8d:   /* TODO: RI */
2569         case 0x8e:   /* TODO: SS2 */
2570         case 0x8f:   /* TODO: SS3 */
2571         case 0x98:   /* TODO: SOS */
2572                 break;
2573         case 0x9a:   /* DECID -- Identify Terminal */
2574                 ttywrite(vtiden, sizeof(vtiden) - 1);
2575                 break;
2576         case 0x9b:   /* TODO: CSI */
2577         case 0x9c:   /* TODO: ST */
2578                 break;
2579         case 0x90:   /* DCS -- Device Control String */
2580         case 0x9f:   /* APC -- Application Program Command */
2581         case 0x9e:   /* PM -- Privacy Message */
2582         case 0x9d:   /* OSC -- Operating System Command */
2583                 tstrsequence(ascii);
2584                 return;
2585         }
2586         /* only CAN, SUB, \a and C1 chars interrupt a sequence */
2587         term.esc &= ~(ESC_STR_END|ESC_STR);
2588         return;
2589 }
2590
2591 /*
2592  * returns 1 when the sequence is finished and it hasn't to read
2593  * more characters for this sequence, otherwise 0
2594  */
2595 int
2596 eschandle(uchar ascii) {
2597         switch(ascii) {
2598         case '[':
2599                 term.esc |= ESC_CSI;
2600                 return 0;
2601         case '#':
2602                 term.esc |= ESC_TEST;
2603                 return 0;
2604         case 'P': /* DCS -- Device Control String */
2605         case '_': /* APC -- Application Program Command */
2606         case '^': /* PM -- Privacy Message */
2607         case ']': /* OSC -- Operating System Command */
2608         case 'k': /* old title set compatibility */
2609                 tstrsequence(ascii);
2610                 return 0;
2611         case 'n': /* LS2 -- Locking shift 2 */
2612         case 'o': /* LS3 -- Locking shift 3 */
2613                 term.charset = 2 + (ascii - 'n');
2614                 break;
2615         case '(': /* GZD4 -- set primary charset G0 */
2616         case ')': /* G1D4 -- set secondary charset G1 */
2617         case '*': /* G2D4 -- set tertiary charset G2 */
2618         case '+': /* G3D4 -- set quaternary charset G3 */
2619                 term.icharset = ascii - '(';
2620                 term.esc |= ESC_ALTCHARSET;
2621                 return 0;
2622         case 'D': /* IND -- Linefeed */
2623                 if(term.c.y == term.bot) {
2624                         tscrollup(term.top, 1);
2625                 } else {
2626                         tmoveto(term.c.x, term.c.y+1);
2627                 }
2628                 break;
2629         case 'E': /* NEL -- Next line */
2630                 tnewline(1); /* always go to first col */
2631                 break;
2632         case 'H': /* HTS -- Horizontal tab stop */
2633                 term.tabs[term.c.x] = 1;
2634                 break;
2635         case 'M': /* RI -- Reverse index */
2636                 if(term.c.y == term.top) {
2637                         tscrolldown(term.top, 1);
2638                 } else {
2639                         tmoveto(term.c.x, term.c.y-1);
2640                 }
2641                 break;
2642         case 'Z': /* DECID -- Identify Terminal */
2643                 ttywrite(vtiden, sizeof(vtiden) - 1);
2644                 break;
2645         case 'c': /* RIS -- Reset to inital state */
2646                 treset();
2647                 xresettitle();
2648                 xloadcols();
2649                 break;
2650         case '=': /* DECPAM -- Application keypad */
2651                 term.mode |= MODE_APPKEYPAD;
2652                 break;
2653         case '>': /* DECPNM -- Normal keypad */
2654                 term.mode &= ~MODE_APPKEYPAD;
2655                 break;
2656         case '7': /* DECSC -- Save Cursor */
2657                 tcursor(CURSOR_SAVE);
2658                 break;
2659         case '8': /* DECRC -- Restore Cursor */
2660                 tcursor(CURSOR_LOAD);
2661                 break;
2662         case '\\': /* ST -- String Terminator */
2663                 if(term.esc & ESC_STR_END)
2664                         strhandle();
2665                 break;
2666         default:
2667                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
2668                         (uchar) ascii, isprint(ascii)? ascii:'.');
2669                 break;
2670         }
2671         return 1;
2672 }
2673
2674 void
2675 tputc(char *c, int len) {
2676         uchar ascii;
2677         bool control;
2678         long unicodep;
2679         int width;
2680         Glyph *gp;
2681
2682         if(len == 1) {
2683                 width = 1;
2684                 unicodep = ascii = *c;
2685         } else {
2686                 utf8decode(c, &unicodep, UTF_SIZ);
2687                 if ((width = wcwidth(unicodep)) == -1) {
2688                         c = "\357\277\275";     /* UTF_INVALID */
2689                         width = 1;
2690                 }
2691                 ascii = unicodep;
2692         }
2693
2694         if(IS_SET(MODE_PRINT))
2695                 tprinter(c, len);
2696         control = ISCONTROL(unicodep);
2697
2698         /*
2699          * STR sequence must be checked before anything else
2700          * because it uses all following characters until it
2701          * receives a ESC, a SUB, a ST or any other C1 control
2702          * character.
2703          */
2704         if(term.esc & ESC_STR) {
2705                 if(len == 1 &&
2706                    (ascii == '\a' || ascii == 030 ||
2707                     ascii == 032  || ascii == 033 ||
2708                     ISCONTROLC1(unicodep))) {
2709                         term.esc &= ~(ESC_START|ESC_STR);
2710                         term.esc |= ESC_STR_END;
2711                 } else if(strescseq.len + len < sizeof(strescseq.buf) - 1) {
2712                         memmove(&strescseq.buf[strescseq.len], c, len);
2713                         strescseq.len += len;
2714                         return;
2715                 } else {
2716                 /*
2717                  * Here is a bug in terminals. If the user never sends
2718                  * some code to stop the str or esc command, then st
2719                  * will stop responding. But this is better than
2720                  * silently failing with unknown characters. At least
2721                  * then users will report back.
2722                  *
2723                  * In the case users ever get fixed, here is the code:
2724                  */
2725                 /*
2726                  * term.esc = 0;
2727                  * strhandle();
2728                  */
2729                         return;
2730                 }
2731         }
2732
2733         /*
2734          * Actions of control codes must be performed as soon they arrive
2735          * because they can be embedded inside a control sequence, and
2736          * they must not cause conflicts with sequences.
2737          */
2738         if(control) {
2739                 tcontrolcode(ascii);
2740                 /*
2741                  * control codes are not shown ever
2742                  */
2743                 return;
2744         } else if(term.esc & ESC_START) {
2745                 if(term.esc & ESC_CSI) {
2746                         csiescseq.buf[csiescseq.len++] = ascii;
2747                         if(BETWEEN(ascii, 0x40, 0x7E)
2748                                         || csiescseq.len >= \
2749                                         sizeof(csiescseq.buf)-1) {
2750                                 term.esc = 0;
2751                                 csiparse();
2752                                 csihandle();
2753                         }
2754                         return;
2755                 } else if(term.esc & ESC_ALTCHARSET) {
2756                         tdeftran(ascii);
2757                 } else if(term.esc & ESC_TEST) {
2758                         tdectest(ascii);
2759                 } else {
2760                         if (!eschandle(ascii))
2761                                 return;
2762                         /* sequence already finished */
2763                 }
2764                 term.esc = 0;
2765                 /*
2766                  * All characters which form part of a sequence are not
2767                  * printed
2768                  */
2769                 return;
2770         }
2771         if(sel.ob.x != -1 && BETWEEN(term.c.y, sel.ob.y, sel.oe.y))
2772                 selclear(NULL);
2773
2774         gp = &term.line[term.c.y][term.c.x];
2775         if(IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
2776                 gp->mode |= ATTR_WRAP;
2777                 tnewline(1);
2778                 gp = &term.line[term.c.y][term.c.x];
2779         }
2780
2781         if(IS_SET(MODE_INSERT) && term.c.x+width < term.col)
2782                 memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
2783
2784         if(term.c.x+width > term.col) {
2785                 tnewline(1);
2786                 gp = &term.line[term.c.y][term.c.x];
2787         }
2788
2789         tsetchar(c, &term.c.attr, term.c.x, term.c.y);
2790
2791         if(width == 2) {
2792                 gp->mode |= ATTR_WIDE;
2793                 if(term.c.x+1 < term.col) {
2794                         gp[1].c[0] = '\0';
2795                         gp[1].mode = ATTR_WDUMMY;
2796                 }
2797         }
2798         if(term.c.x+width < term.col) {
2799                 tmoveto(term.c.x+width, term.c.y);
2800         } else {
2801                 term.c.state |= CURSOR_WRAPNEXT;
2802         }
2803 }
2804
2805 void
2806 tresize(int col, int row) {
2807         int i;
2808         int minrow = MIN(row, term.row);
2809         int mincol = MIN(col, term.col);
2810         bool *bp;
2811         TCursor c;
2812
2813         if(col < 1 || row < 1) {
2814                 fprintf(stderr,
2815                         "tresize: error resizing to %dx%d\n", col, row);
2816                 return;
2817         }
2818
2819         /*
2820          * slide screen to keep cursor where we expect it -
2821          * tscrollup would work here, but we can optimize to
2822          * memmove because we're freeing the earlier lines
2823          */
2824         for(i = 0; i <= term.c.y - row; i++) {
2825                 free(term.line[i]);
2826                 free(term.alt[i]);
2827         }
2828         /* ensure that both src and dst are not NULL */
2829         if (i > 0) {
2830                 memmove(term.line, term.line + i, row * sizeof(Line));
2831                 memmove(term.alt, term.alt + i, row * sizeof(Line));
2832         }
2833         for(i += row; i < term.row; i++) {
2834                 free(term.line[i]);
2835                 free(term.alt[i]);
2836         }
2837
2838         /* resize to new height */
2839         term.line = xrealloc(term.line, row * sizeof(Line));
2840         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
2841         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
2842         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
2843
2844         /* resize each row to new width, zero-pad if needed */
2845         for(i = 0; i < minrow; i++) {
2846                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
2847                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
2848         }
2849
2850         /* allocate any new rows */
2851         for(/* i == minrow */; i < row; i++) {
2852                 term.line[i] = xmalloc(col * sizeof(Glyph));
2853                 term.alt[i] = xmalloc(col * sizeof(Glyph));
2854         }
2855         if(col > term.col) {
2856                 bp = term.tabs + term.col;
2857
2858                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
2859                 while(--bp > term.tabs && !*bp)
2860                         /* nothing */ ;
2861                 for(bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
2862                         *bp = 1;
2863         }
2864         /* update terminal size */
2865         term.col = col;
2866         term.row = row;
2867         /* reset scrolling region */
2868         tsetscroll(0, row-1);
2869         /* make use of the LIMIT in tmoveto */
2870         tmoveto(term.c.x, term.c.y);
2871         /* Clearing both screens (it makes dirty all lines) */
2872         c = term.c;
2873         for(i = 0; i < 2; i++) {
2874                 if(mincol < col && 0 < minrow) {
2875                         tclearregion(mincol, 0, col - 1, minrow - 1);
2876                 }
2877                 if(0 < col && minrow < row) {
2878                         tclearregion(0, minrow, col - 1, row - 1);
2879                 }
2880                 tswapscreen();
2881                 tcursor(CURSOR_LOAD);
2882         }
2883         term.c = c;
2884 }
2885
2886 void
2887 xresize(int col, int row) {
2888         xw.tw = MAX(1, col * xw.cw);
2889         xw.th = MAX(1, row * xw.ch);
2890
2891         XFreePixmap(xw.dpy, xw.buf);
2892         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
2893                         DefaultDepth(xw.dpy, xw.scr));
2894         XftDrawChange(xw.draw, xw.buf);
2895         xclear(0, 0, xw.w, xw.h);
2896 }
2897
2898 ushort
2899 sixd_to_16bit(int x) {
2900         return x == 0 ? 0 : 0x3737 + 0x2828 * x;
2901 }
2902
2903 void
2904 xloadcols(void) {
2905         int i;
2906         XRenderColor color = { .alpha = 0xffff };
2907         static bool loaded;
2908         Color *cp;
2909
2910         if(loaded) {
2911                 for (cp = dc.col; cp < dc.col + LEN(dc.col); ++cp)
2912                         XftColorFree(xw.dpy, xw.vis, xw.cmap, cp);
2913         }
2914
2915         /* load colors [0-15] and [256-LEN(colorname)] (config.h) */
2916         for(i = 0; i < LEN(colorname); i++) {
2917                 if(!colorname[i])
2918                         continue;
2919                 if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, colorname[i], &dc.col[i])) {
2920                         die("Could not allocate color '%s'\n", colorname[i]);
2921                 }
2922         }
2923
2924         /* load colors [16-231] ; same colors as xterm */
2925         for(i = 16; i < 6*6*6+16; i++) {
2926                 color.red   = sixd_to_16bit( ((i-16)/36)%6 );
2927                 color.green = sixd_to_16bit( ((i-16)/6) %6 );
2928                 color.blue  = sixd_to_16bit( ((i-16)/1) %6 );
2929                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2930                         die("Could not allocate color %d\n", i);
2931         }
2932
2933         /* load colors [232-255] ; grayscale */
2934         for(; i < 256; i++) {
2935                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * (i-(6*6*6+16));
2936                 if(!XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &color, &dc.col[i]))
2937                         die("Could not allocate color %d\n", i);
2938         }
2939         loaded = true;
2940 }
2941
2942 int
2943 xsetcolorname(int x, const char *name) {
2944         XRenderColor color = { .alpha = 0xffff };
2945         Color ncolor;
2946
2947         if(!BETWEEN(x, 0, LEN(colorname)))
2948                 return 1;
2949
2950         if(!name) {
2951                 if(BETWEEN(x, 16, 16 + 215)) { /* 256 color */
2952                         color.red   = sixd_to_16bit( ((x-16)/36)%6 );
2953                         color.green = sixd_to_16bit( ((x-16)/6) %6 );
2954                         color.blue  = sixd_to_16bit( ((x-16)/1) %6 );
2955                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2956                                                 xw.cmap, &color, &ncolor)) {
2957                                 return 1;
2958                         }
2959
2960                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2961                         dc.col[x] = ncolor;
2962                         return 0;
2963                 } else if(BETWEEN(x, 16 + 216, 255)) { /* greyscale */
2964                         color.red = color.green = color.blue = \
2965                                     0x0808 + 0x0a0a * (x - (16 + 216));
2966                         if(!XftColorAllocValue(xw.dpy, xw.vis,
2967                                                 xw.cmap, &color, &ncolor)) {
2968                                 return 1;
2969                         }
2970
2971                         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2972                         dc.col[x] = ncolor;
2973                         return 0;
2974                 } else { /* system colors */
2975                         name = colorname[x];
2976                 }
2977         }
2978         if(!XftColorAllocName(xw.dpy, xw.vis, xw.cmap, name, &ncolor))
2979                 return 1;
2980
2981         XftColorFree(xw.dpy, xw.vis, xw.cmap, &dc.col[x]);
2982         dc.col[x] = ncolor;
2983         return 0;
2984 }
2985
2986 void
2987 xtermclear(int col1, int row1, int col2, int row2) {
2988         XftDrawRect(xw.draw,
2989                         &dc.col[IS_SET(MODE_REVERSE) ? defaultfg : defaultbg],
2990                         borderpx + col1 * xw.cw,
2991                         borderpx + row1 * xw.ch,
2992                         (col2-col1+1) * xw.cw,
2993                         (row2-row1+1) * xw.ch);
2994 }
2995
2996 /*
2997  * Absolute coordinates.
2998  */
2999 void
3000 xclear(int x1, int y1, int x2, int y2) {
3001         XftDrawRect(xw.draw,
3002                         &dc.col[IS_SET(MODE_REVERSE)? defaultfg : defaultbg],
3003                         x1, y1, x2-x1, y2-y1);
3004 }
3005
3006 void
3007 xhints(void) {
3008         XClassHint class = {opt_class ? opt_class : termname, termname};
3009         XWMHints wm = {.flags = InputHint, .input = 1};
3010         XSizeHints *sizeh = NULL;
3011
3012         sizeh = XAllocSizeHints();
3013
3014         sizeh->flags = PSize | PResizeInc | PBaseSize;
3015         sizeh->height = xw.h;
3016         sizeh->width = xw.w;
3017         sizeh->height_inc = xw.ch;
3018         sizeh->width_inc = xw.cw;
3019         sizeh->base_height = 2 * borderpx;
3020         sizeh->base_width = 2 * borderpx;
3021         if(xw.isfixed == True) {
3022                 sizeh->flags |= PMaxSize | PMinSize;
3023                 sizeh->min_width = sizeh->max_width = xw.w;
3024                 sizeh->min_height = sizeh->max_height = xw.h;
3025         }
3026         if(xw.gm & (XValue|YValue)) {
3027                 sizeh->flags |= USPosition | PWinGravity;
3028                 sizeh->x = xw.l;
3029                 sizeh->y = xw.t;
3030                 sizeh->win_gravity = xgeommasktogravity(xw.gm);
3031         }
3032
3033         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm,
3034                         &class);
3035         XFree(sizeh);
3036 }
3037
3038 int
3039 xgeommasktogravity(int mask) {
3040         switch(mask & (XNegative|YNegative)) {
3041         case 0:
3042                 return NorthWestGravity;
3043         case XNegative:
3044                 return NorthEastGravity;
3045         case YNegative:
3046                 return SouthWestGravity;
3047         }
3048         return SouthEastGravity;
3049 }
3050
3051 int
3052 xloadfont(Font *f, FcPattern *pattern) {
3053         FcPattern *match;
3054         FcResult result;
3055
3056         match = FcFontMatch(NULL, pattern, &result);
3057         if(!match)
3058                 return 1;
3059
3060         if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
3061                 FcPatternDestroy(match);
3062                 return 1;
3063         }
3064
3065         f->set = NULL;
3066         f->pattern = FcPatternDuplicate(pattern);
3067
3068         f->ascent = f->match->ascent;
3069         f->descent = f->match->descent;
3070         f->lbearing = 0;
3071         f->rbearing = f->match->max_advance_width;
3072
3073         f->height = f->ascent + f->descent;
3074         f->width = f->lbearing + f->rbearing;
3075
3076         return 0;
3077 }
3078
3079 void
3080 xloadfonts(char *fontstr, double fontsize) {
3081         FcPattern *pattern;
3082         FcResult r_sz, r_psz;
3083         double fontval;
3084         float ceilf(float);
3085
3086         if(fontstr[0] == '-') {
3087                 pattern = XftXlfdParse(fontstr, False, False);
3088         } else {
3089                 pattern = FcNameParse((FcChar8 *)fontstr);
3090         }
3091
3092         if(!pattern)
3093                 die("st: can't open font %s\n", fontstr);
3094
3095         if(fontsize > 1) {
3096                 FcPatternDel(pattern, FC_PIXEL_SIZE);
3097                 FcPatternDel(pattern, FC_SIZE);
3098                 FcPatternAddDouble(pattern, FC_PIXEL_SIZE, (double)fontsize);
3099                 usedfontsize = fontsize;
3100         } else {
3101                 r_psz = FcPatternGetDouble(pattern, FC_PIXEL_SIZE, 0, &fontval);
3102                 r_sz = FcPatternGetDouble(pattern, FC_SIZE, 0, &fontval);
3103                 if(r_psz == FcResultMatch) {
3104                         usedfontsize = fontval;
3105                 } else if(r_sz == FcResultMatch) {
3106                         usedfontsize = -1;
3107                 } else {
3108                         /*
3109                          * Default font size is 12, if none given. This is to
3110                          * have a known usedfontsize value.
3111                          */
3112                         FcPatternAddDouble(pattern, FC_PIXEL_SIZE, 12);
3113                         usedfontsize = 12;
3114                 }
3115                 defaultfontsize = usedfontsize;
3116         }
3117
3118         FcConfigSubstitute(0, pattern, FcMatchPattern);
3119         FcDefaultSubstitute(pattern);
3120
3121         if(xloadfont(&dc.font, pattern))
3122                 die("st: can't open font %s\n", fontstr);
3123
3124         if(usedfontsize < 0) {
3125                 FcPatternGetDouble(dc.font.match->pattern,
3126                                    FC_PIXEL_SIZE, 0, &fontval);
3127                 usedfontsize = fontval;
3128                 if(fontsize == 0)
3129                         defaultfontsize = fontval;
3130         }
3131
3132         /* Setting character width and height. */
3133         xw.cw = ceilf(dc.font.width * cwscale);
3134         xw.ch = ceilf(dc.font.height * chscale);
3135
3136         FcPatternDel(pattern, FC_SLANT);
3137         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ITALIC);
3138         if(xloadfont(&dc.ifont, pattern))
3139                 die("st: can't open font %s\n", fontstr);
3140
3141         FcPatternDel(pattern, FC_WEIGHT);
3142         FcPatternAddInteger(pattern, FC_WEIGHT, FC_WEIGHT_BOLD);
3143         if(xloadfont(&dc.ibfont, pattern))
3144                 die("st: can't open font %s\n", fontstr);
3145
3146         FcPatternDel(pattern, FC_SLANT);
3147         FcPatternAddInteger(pattern, FC_SLANT, FC_SLANT_ROMAN);
3148         if(xloadfont(&dc.bfont, pattern))
3149                 die("st: can't open font %s\n", fontstr);
3150
3151         FcPatternDestroy(pattern);
3152 }
3153
3154 void
3155 xunloadfont(Font *f) {
3156         XftFontClose(xw.dpy, f->match);
3157         FcPatternDestroy(f->pattern);
3158         if(f->set)
3159                 FcFontSetDestroy(f->set);
3160 }
3161
3162 void
3163 xunloadfonts(void) {
3164         /* Free the loaded fonts in the font cache.  */
3165         while(frclen > 0)
3166                 XftFontClose(xw.dpy, frc[--frclen].font);
3167
3168         xunloadfont(&dc.font);
3169         xunloadfont(&dc.bfont);
3170         xunloadfont(&dc.ifont);
3171         xunloadfont(&dc.ibfont);
3172 }
3173
3174 void
3175 xzoom(const Arg *arg) {
3176         Arg larg;
3177
3178         larg.i = usedfontsize + arg->i;
3179         xzoomabs(&larg);
3180 }
3181
3182 void
3183 xzoomabs(const Arg *arg) {
3184         xunloadfonts();
3185         xloadfonts(usedfont, arg->i);
3186         cresize(0, 0);
3187         redraw();
3188         xhints();
3189 }
3190
3191 void
3192 xzoomreset(const Arg *arg) {
3193         Arg larg;
3194
3195         if(defaultfontsize > 0) {
3196                 larg.i = defaultfontsize;
3197                 xzoomabs(&larg);
3198         }
3199 }
3200
3201 void
3202 xinit(void) {
3203         XGCValues gcvalues;
3204         Cursor cursor;
3205         Window parent;
3206         pid_t thispid = getpid();
3207
3208         if(!(xw.dpy = XOpenDisplay(NULL)))
3209                 die("Can't open display\n");
3210         xw.scr = XDefaultScreen(xw.dpy);
3211         xw.vis = XDefaultVisual(xw.dpy, xw.scr);
3212
3213         /* font */
3214         if(!FcInit())
3215                 die("Could not init fontconfig.\n");
3216
3217         usedfont = (opt_font == NULL)? font : opt_font;
3218         xloadfonts(usedfont, 0);
3219
3220         /* colors */
3221         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
3222         xloadcols();
3223
3224         /* adjust fixed window geometry */
3225         xw.w = 2 * borderpx + term.col * xw.cw;
3226         xw.h = 2 * borderpx + term.row * xw.ch;
3227         if(xw.gm & XNegative)
3228                 xw.l += DisplayWidth(xw.dpy, xw.scr) - xw.w - 2;
3229         if(xw.gm & YNegative)
3230                 xw.t += DisplayWidth(xw.dpy, xw.scr) - xw.h - 2;
3231
3232         /* Events */
3233         xw.attrs.background_pixel = dc.col[defaultbg].pixel;
3234         xw.attrs.border_pixel = dc.col[defaultbg].pixel;
3235         xw.attrs.bit_gravity = NorthWestGravity;
3236         xw.attrs.event_mask = FocusChangeMask | KeyPressMask
3237                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
3238                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
3239         xw.attrs.colormap = xw.cmap;
3240
3241         if (!(opt_embed && (parent = strtol(opt_embed, NULL, 0))))
3242                 parent = XRootWindow(xw.dpy, xw.scr);
3243         xw.win = XCreateWindow(xw.dpy, parent, xw.l, xw.t,
3244                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
3245                         xw.vis, CWBackPixel | CWBorderPixel | CWBitGravity
3246                         | CWEventMask | CWColormap, &xw.attrs);
3247
3248         memset(&gcvalues, 0, sizeof(gcvalues));
3249         gcvalues.graphics_exposures = False;
3250         dc.gc = XCreateGC(xw.dpy, parent, GCGraphicsExposures,
3251                         &gcvalues);
3252         xw.buf = XCreatePixmap(xw.dpy, xw.win, xw.w, xw.h,
3253                         DefaultDepth(xw.dpy, xw.scr));
3254         XSetForeground(xw.dpy, dc.gc, dc.col[defaultbg].pixel);
3255         XFillRectangle(xw.dpy, xw.buf, dc.gc, 0, 0, xw.w, xw.h);
3256
3257         /* Xft rendering context */
3258         xw.draw = XftDrawCreate(xw.dpy, xw.buf, xw.vis, xw.cmap);
3259
3260         /* input methods */
3261         if((xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3262                 XSetLocaleModifiers("@im=local");
3263                 if((xw.xim =  XOpenIM(xw.dpy, NULL, NULL, NULL)) == NULL) {
3264                         XSetLocaleModifiers("@im=");
3265                         if((xw.xim = XOpenIM(xw.dpy,
3266                                         NULL, NULL, NULL)) == NULL) {
3267                                 die("XOpenIM failed. Could not open input"
3268                                         " device.\n");
3269                         }
3270                 }
3271         }
3272         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
3273                                            | XIMStatusNothing, XNClientWindow, xw.win,
3274                                            XNFocusWindow, xw.win, NULL);
3275         if(xw.xic == NULL)
3276                 die("XCreateIC failed. Could not obtain input method.\n");
3277
3278         /* white cursor, black outline */
3279         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
3280         XDefineCursor(xw.dpy, xw.win, cursor);
3281         XRecolorCursor(xw.dpy, cursor,
3282                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
3283                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
3284
3285         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
3286         xw.wmdeletewin = XInternAtom(xw.dpy, "WM_DELETE_WINDOW", False);
3287         xw.netwmname = XInternAtom(xw.dpy, "_NET_WM_NAME", False);
3288         XSetWMProtocols(xw.dpy, xw.win, &xw.wmdeletewin, 1);
3289
3290         xw.netwmpid = XInternAtom(xw.dpy, "_NET_WM_PID", False);
3291         XChangeProperty(xw.dpy, xw.win, xw.netwmpid, XA_CARDINAL, 32,
3292                         PropModeReplace, (uchar *)&thispid, 1);
3293
3294         xresettitle();
3295         XMapWindow(xw.dpy, xw.win);
3296         xhints();
3297         XSync(xw.dpy, False);
3298 }
3299
3300 void
3301 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
3302         int winx = borderpx + x * xw.cw, winy = borderpx + y * xw.ch,
3303             width = charlen * xw.cw, xp, i;
3304         int frcflags, charexists;
3305         int u8fl, u8fblen, u8cblen, doesexist;
3306         char *u8c, *u8fs;
3307         long unicodep;
3308         Font *font = &dc.font;
3309         FcResult fcres;
3310         FcPattern *fcpattern, *fontpattern;
3311         FcFontSet *fcsets[] = { NULL };
3312         FcCharSet *fccharset;
3313         Color *fg, *bg, *temp, revfg, revbg, truefg, truebg;
3314         XRenderColor colfg, colbg;
3315         XRectangle r;
3316         int oneatatime;
3317
3318         frcflags = FRC_NORMAL;
3319
3320         if(base.mode & ATTR_ITALIC) {
3321                 if(base.fg == defaultfg)
3322                         base.fg = defaultitalic;
3323                 font = &dc.ifont;
3324                 frcflags = FRC_ITALIC;
3325         } else if((base.mode & ATTR_ITALIC) && (base.mode & ATTR_BOLD)) {
3326                 if(base.fg == defaultfg)
3327                         base.fg = defaultitalic;
3328                 font = &dc.ibfont;
3329                 frcflags = FRC_ITALICBOLD;
3330         } else if(base.mode & ATTR_UNDERLINE) {
3331                 if(base.fg == defaultfg)
3332                         base.fg = defaultunderline;
3333         }
3334
3335         if(IS_TRUECOL(base.fg)) {
3336                 colfg.alpha = 0xffff;
3337                 colfg.red = TRUERED(base.fg);
3338                 colfg.green = TRUEGREEN(base.fg);
3339                 colfg.blue = TRUEBLUE(base.fg);
3340                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &truefg);
3341                 fg = &truefg;
3342         } else {
3343                 fg = &dc.col[base.fg];
3344         }
3345
3346         if(IS_TRUECOL(base.bg)) {
3347                 colbg.alpha = 0xffff;
3348                 colbg.green = TRUEGREEN(base.bg);
3349                 colbg.red = TRUERED(base.bg);
3350                 colbg.blue = TRUEBLUE(base.bg);
3351                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg, &truebg);
3352                 bg = &truebg;
3353         } else {
3354                 bg = &dc.col[base.bg];
3355         }
3356
3357         if(base.mode & ATTR_BOLD) {
3358                 /*
3359                  * change basic system colors [0-7]
3360                  * to bright system colors [8-15]
3361                  */
3362                 if(BETWEEN(base.fg, 0, 7) && !(base.mode & ATTR_FAINT))
3363                         fg = &dc.col[base.fg + 8];
3364
3365                 if(base.mode & ATTR_ITALIC) {
3366                         font = &dc.ibfont;
3367                         frcflags = FRC_ITALICBOLD;
3368                 } else {
3369                         font = &dc.bfont;
3370                         frcflags = FRC_BOLD;
3371                 }
3372         }
3373
3374         if(IS_SET(MODE_REVERSE)) {
3375                 if(fg == &dc.col[defaultfg]) {
3376                         fg = &dc.col[defaultbg];
3377                 } else {
3378                         colfg.red = ~fg->color.red;
3379                         colfg.green = ~fg->color.green;
3380                         colfg.blue = ~fg->color.blue;
3381                         colfg.alpha = fg->color.alpha;
3382                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg,
3383                                         &revfg);
3384                         fg = &revfg;
3385                 }
3386
3387                 if(bg == &dc.col[defaultbg]) {
3388                         bg = &dc.col[defaultfg];
3389                 } else {
3390                         colbg.red = ~bg->color.red;
3391                         colbg.green = ~bg->color.green;
3392                         colbg.blue = ~bg->color.blue;
3393                         colbg.alpha = bg->color.alpha;
3394                         XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colbg,
3395                                         &revbg);
3396                         bg = &revbg;
3397                 }
3398         }
3399
3400         if(base.mode & ATTR_REVERSE) {
3401                 temp = fg;
3402                 fg = bg;
3403                 bg = temp;
3404         }
3405
3406         if(base.mode & ATTR_FAINT && !(base.mode & ATTR_BOLD)) {
3407                 colfg.red = fg->color.red / 2;
3408                 colfg.green = fg->color.green / 2;
3409                 colfg.blue = fg->color.blue / 2;
3410                 XftColorAllocValue(xw.dpy, xw.vis, xw.cmap, &colfg, &revfg);
3411                 fg = &revfg;
3412         }
3413
3414         if(base.mode & ATTR_BLINK && term.mode & MODE_BLINK)
3415                 fg = bg;
3416
3417         if(base.mode & ATTR_INVISIBLE)
3418                 fg = bg;
3419
3420         /* Intelligent cleaning up of the borders. */
3421         if(x == 0) {
3422                 xclear(0, (y == 0)? 0 : winy, borderpx,
3423                         winy + xw.ch + ((y >= term.row-1)? xw.h : 0));
3424         }
3425         if(x + charlen >= term.col) {
3426                 xclear(winx + width, (y == 0)? 0 : winy, xw.w,
3427                         ((y >= term.row-1)? xw.h : (winy + xw.ch)));
3428         }
3429         if(y == 0)
3430                 xclear(winx, 0, winx + width, borderpx);
3431         if(y == term.row-1)
3432                 xclear(winx, winy + xw.ch, winx + width, xw.h);
3433
3434         /* Clean up the region we want to draw to. */
3435         XftDrawRect(xw.draw, bg, winx, winy, width, xw.ch);
3436
3437         /* Set the clip region because Xft is sometimes dirty. */
3438         r.x = 0;
3439         r.y = 0;
3440         r.height = xw.ch;
3441         r.width = width;
3442         XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
3443
3444         for(xp = winx; bytelen > 0;) {
3445                 /*
3446                  * Search for the range in the to be printed string of glyphs
3447                  * that are in the main font. Then print that range. If
3448                  * some glyph is found that is not in the font, do the
3449                  * fallback dance.
3450                  */
3451                 u8fs = s;
3452                 u8fblen = 0;
3453                 u8fl = 0;
3454                 oneatatime = font->width != xw.cw;
3455                 for(;;) {
3456                         u8c = s;
3457                         u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
3458                         s += u8cblen;
3459                         bytelen -= u8cblen;
3460
3461                         doesexist = XftCharExists(xw.dpy, font->match, unicodep);
3462                         if(doesexist) {
3463                                         u8fl++;
3464                                         u8fblen += u8cblen;
3465                                         if(!oneatatime && bytelen > 0)
3466                                                         continue;
3467                         }
3468
3469                         if(u8fl > 0) {
3470                                 XftDrawStringUtf8(xw.draw, fg,
3471                                                 font->match, xp,
3472                                                 winy + font->ascent,
3473                                                 (FcChar8 *)u8fs,
3474                                                 u8fblen);
3475                                 xp += xw.cw * u8fl;
3476                         }
3477                         break;
3478                 }
3479                 if(doesexist) {
3480                         if(oneatatime)
3481                                 continue;
3482                         break;
3483                 }
3484
3485                 /* Search the font cache. */
3486                 for(i = 0; i < frclen; i++) {
3487                         charexists = XftCharExists(xw.dpy, frc[i].font, unicodep);
3488                         /* Everything correct. */
3489                         if(charexists && frc[i].flags == frcflags)
3490                                 break;
3491                         /* We got a default font for a not found glyph. */
3492                         if(!charexists && frc[i].flags == frcflags \
3493                                         && frc[i].unicodep == unicodep) {
3494                                 break;
3495                         }
3496                 }
3497
3498                 /* Nothing was found. */
3499                 if(i >= frclen) {
3500                         if(!font->set)
3501                                 font->set = FcFontSort(0, font->pattern,
3502                                                        FcTrue, 0, &fcres);
3503                         fcsets[0] = font->set;
3504
3505                         /*
3506                          * Nothing was found in the cache. Now use
3507                          * some dozen of Fontconfig calls to get the
3508                          * font for one single character.
3509                          *
3510                          * Xft and fontconfig are design failures.
3511                          */
3512                         fcpattern = FcPatternDuplicate(font->pattern);
3513                         fccharset = FcCharSetCreate();
3514
3515                         FcCharSetAddChar(fccharset, unicodep);
3516                         FcPatternAddCharSet(fcpattern, FC_CHARSET,
3517                                         fccharset);
3518                         FcPatternAddBool(fcpattern, FC_SCALABLE,
3519                                         FcTrue);
3520
3521                         FcConfigSubstitute(0, fcpattern,
3522                                         FcMatchPattern);
3523                         FcDefaultSubstitute(fcpattern);
3524
3525                         fontpattern = FcFontSetMatch(0, fcsets, 1,
3526                                         fcpattern, &fcres);
3527
3528                         /*
3529                          * Overwrite or create the new cache entry.
3530                          */
3531                         if(frclen >= LEN(frc)) {
3532                                 frclen = LEN(frc) - 1;
3533                                 XftFontClose(xw.dpy, frc[frclen].font);
3534                                 frc[frclen].unicodep = 0;
3535                         }
3536
3537                         frc[frclen].font = XftFontOpenPattern(xw.dpy,
3538                                         fontpattern);
3539                         frc[frclen].flags = frcflags;
3540                         frc[frclen].unicodep = unicodep;
3541
3542                         i = frclen;
3543                         frclen++;
3544
3545                         FcPatternDestroy(fcpattern);
3546                         FcCharSetDestroy(fccharset);
3547                 }
3548
3549                 XftDrawStringUtf8(xw.draw, fg, frc[i].font,
3550                                 xp, winy + frc[i].font->ascent,
3551                                 (FcChar8 *)u8c, u8cblen);
3552
3553                 xp += xw.cw * wcwidth(unicodep);
3554         }
3555
3556         /*
3557          * This is how the loop above actually should be. Why does the
3558          * application have to care about font details?
3559          *
3560          * I have to repeat: Xft and Fontconfig are design failures.
3561          */
3562         /*
3563         XftDrawStringUtf8(xw.draw, fg, font->set, winx,
3564                         winy + font->ascent, (FcChar8 *)s, bytelen);
3565         */
3566
3567         if(base.mode & ATTR_UNDERLINE) {
3568                 XftDrawRect(xw.draw, fg, winx, winy + font->ascent + 1,
3569                                 width, 1);
3570         }
3571
3572         if(base.mode & ATTR_STRUCK) {
3573                 XftDrawRect(xw.draw, fg, winx, winy + 2 * font->ascent / 3,
3574                                 width, 1);
3575         }
3576
3577         /* Reset clip to none. */
3578         XftDrawSetClip(xw.draw, 0);
3579 }
3580
3581 void
3582 xdrawcursor(void) {
3583         static int oldx = 0, oldy = 0;
3584         int sl, width, curx;
3585         Glyph g = {{' '}, ATTR_NULL, defaultbg, defaultcs};
3586
3587         LIMIT(oldx, 0, term.col-1);
3588         LIMIT(oldy, 0, term.row-1);
3589
3590         curx = term.c.x;
3591
3592         /* adjust position if in dummy */
3593         if(term.line[oldy][oldx].mode & ATTR_WDUMMY)
3594                 oldx--;
3595         if(term.line[term.c.y][curx].mode & ATTR_WDUMMY)
3596                 curx--;
3597
3598         memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
3599
3600         /* remove the old cursor */
3601         sl = utf8len(term.line[oldy][oldx].c);
3602         width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
3603         xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
3604                         oldy, width, sl);
3605
3606         if(IS_SET(MODE_HIDE))
3607                 return;
3608
3609         /* draw the new one */
3610         if(xw.state & WIN_FOCUSED) {
3611                 switch (xw.cursor) {
3612                         case 0: /* Blinking Block */
3613                         case 1: /* Blinking Block (Default) */
3614                         case 2: /* Steady Block */
3615                                 if(IS_SET(MODE_REVERSE)) {
3616                                                 g.mode |= ATTR_REVERSE;
3617                                                 g.fg = defaultcs;
3618                                                 g.bg = defaultfg;
3619                                         }
3620
3621                                 sl = utf8len(g.c);
3622                                 width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
3623                                         ? 2 : 1;
3624                                 xdraws(g.c, g, term.c.x, term.c.y, width, sl);
3625                                 break;
3626                         case 3: /* Blinking Underline */
3627                         case 4: /* Steady Underline */
3628                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3629                                                 borderpx + curx * xw.cw,
3630                                                 borderpx + (term.c.y + 1) * xw.ch - cursorthickness,
3631                                                 xw.cw, cursorthickness);
3632                                 break;
3633                         case 5: /* Blinking bar */
3634                         case 6: /* Steady bar */
3635                                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3636                                                 borderpx + curx * xw.cw,
3637                                                 borderpx + term.c.y * xw.ch,
3638                                                 cursorthickness, xw.ch);
3639                                 break;
3640                 }
3641         } else {
3642                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3643                                 borderpx + curx * xw.cw,
3644                                 borderpx + term.c.y * xw.ch,
3645                                 xw.cw - 1, 1);
3646                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3647                                 borderpx + curx * xw.cw,
3648                                 borderpx + term.c.y * xw.ch,
3649                                 1, xw.ch - 1);
3650                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3651                                 borderpx + (curx + 1) * xw.cw - 1,
3652                                 borderpx + term.c.y * xw.ch,
3653                                 1, xw.ch - 1);
3654                 XftDrawRect(xw.draw, &dc.col[defaultcs],
3655                                 borderpx + curx * xw.cw,
3656                                 borderpx + (term.c.y + 1) * xw.ch - 1,
3657                                 xw.cw, 1);
3658         }
3659         oldx = curx, oldy = term.c.y;
3660 }
3661
3662
3663 void
3664 xsettitle(char *p) {
3665         XTextProperty prop;
3666
3667         Xutf8TextListToTextProperty(xw.dpy, &p, 1, XUTF8StringStyle,
3668                         &prop);
3669         XSetWMName(xw.dpy, xw.win, &prop);
3670         XSetTextProperty(xw.dpy, xw.win, &prop, xw.netwmname);
3671         XFree(prop.value);
3672 }
3673
3674 void
3675 xresettitle(void) {
3676         xsettitle(opt_title ? opt_title : "st");
3677 }
3678
3679 void
3680 redraw(void) {
3681         tfulldirt();
3682         draw();
3683 }
3684
3685 void
3686 draw(void) {
3687         drawregion(0, 0, term.col, term.row);
3688         XCopyArea(xw.dpy, xw.buf, xw.win, dc.gc, 0, 0, xw.w,
3689                         xw.h, 0, 0);
3690         XSetForeground(xw.dpy, dc.gc,
3691                         dc.col[IS_SET(MODE_REVERSE)?
3692                                 defaultfg : defaultbg].pixel);
3693 }
3694
3695 void
3696 drawregion(int x1, int y1, int x2, int y2) {
3697         int ic, ib, x, y, ox, sl;
3698         Glyph base, new;
3699         char buf[DRAW_BUF_SIZ];
3700         bool ena_sel = sel.ob.x != -1 && sel.alt == IS_SET(MODE_ALTSCREEN);
3701         long unicodep;
3702
3703         if(!(xw.state & WIN_VISIBLE))
3704                 return;
3705
3706         for(y = y1; y < y2; y++) {
3707                 if(!term.dirty[y])
3708                         continue;
3709
3710                 xtermclear(0, y, term.col, y);
3711                 term.dirty[y] = 0;
3712                 base = term.line[y][0];
3713                 ic = ib = ox = 0;
3714                 for(x = x1; x < x2; x++) {
3715                         new = term.line[y][x];
3716                         if(new.mode == ATTR_WDUMMY)
3717                                 continue;
3718                         if(ena_sel && selected(x, y))
3719                                 new.mode ^= ATTR_REVERSE;
3720                         if(ib > 0 && (ATTRCMP(base, new)
3721                                         || ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
3722                                 xdraws(buf, base, ox, y, ic, ib);
3723                                 ic = ib = 0;
3724                         }
3725                         if(ib == 0) {
3726                                 ox = x;
3727                                 base = new;
3728                         }
3729
3730                         sl = utf8decode(new.c, &unicodep, UTF_SIZ);
3731                         memcpy(buf+ib, new.c, sl);
3732                         ib += sl;
3733                         ic += (new.mode & ATTR_WIDE)? 2 : 1;
3734                 }
3735                 if(ib > 0)
3736                         xdraws(buf, base, ox, y, ic, ib);
3737         }
3738         xdrawcursor();
3739 }
3740
3741 void
3742 expose(XEvent *ev) {
3743         XExposeEvent *e = &ev->xexpose;
3744
3745         if(xw.state & WIN_REDRAW) {
3746                 if(!e->count)
3747                         xw.state &= ~WIN_REDRAW;
3748         }
3749         redraw();
3750 }
3751
3752 void
3753 visibility(XEvent *ev) {
3754         XVisibilityEvent *e = &ev->xvisibility;
3755
3756         if(e->state == VisibilityFullyObscured) {
3757                 xw.state &= ~WIN_VISIBLE;
3758         } else if(!(xw.state & WIN_VISIBLE)) {
3759                 /* need a full redraw for next Expose, not just a buf copy */
3760                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
3761         }
3762 }
3763
3764 void
3765 unmap(XEvent *ev) {
3766         xw.state &= ~WIN_VISIBLE;
3767 }
3768
3769 void
3770 xsetpointermotion(int set) {
3771         MODBIT(xw.attrs.event_mask, set, PointerMotionMask);
3772         XChangeWindowAttributes(xw.dpy, xw.win, CWEventMask, &xw.attrs);
3773 }
3774
3775 void
3776 xseturgency(int add) {
3777         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
3778
3779         MODBIT(h->flags, add, XUrgencyHint);
3780         XSetWMHints(xw.dpy, xw.win, h);
3781         XFree(h);
3782 }
3783
3784 void
3785 focus(XEvent *ev) {
3786         XFocusChangeEvent *e = &ev->xfocus;
3787
3788         if(e->mode == NotifyGrab)
3789                 return;
3790
3791         if(ev->type == FocusIn) {
3792                 XSetICFocus(xw.xic);
3793                 xw.state |= WIN_FOCUSED;
3794                 xseturgency(0);
3795                 if(IS_SET(MODE_FOCUS))
3796                         ttywrite("\033[I", 3);
3797         } else {
3798                 XUnsetICFocus(xw.xic);
3799                 xw.state &= ~WIN_FOCUSED;
3800                 if(IS_SET(MODE_FOCUS))
3801                         ttywrite("\033[O", 3);
3802         }
3803 }
3804
3805 bool
3806 match(uint mask, uint state) {
3807         return mask == XK_ANY_MOD || mask == (state & ~ignoremod);
3808 }
3809
3810 void
3811 numlock(const Arg *dummy) {
3812         term.numlock ^= 1;
3813 }
3814
3815 char*
3816 kmap(KeySym k, uint state) {
3817         Key *kp;
3818         int i;
3819
3820         /* Check for mapped keys out of X11 function keys. */
3821         for(i = 0; i < LEN(mappedkeys); i++) {
3822                 if(mappedkeys[i] == k)
3823                         break;
3824         }
3825         if(i == LEN(mappedkeys)) {
3826                 if((k & 0xFFFF) < 0xFD00)
3827                         return NULL;
3828         }
3829
3830         for(kp = key; kp < key + LEN(key); kp++) {
3831                 if(kp->k != k)
3832                         continue;
3833
3834                 if(!match(kp->mask, state))
3835                         continue;
3836
3837                 if(IS_SET(MODE_APPKEYPAD) ? kp->appkey < 0 : kp->appkey > 0)
3838                         continue;
3839                 if(term.numlock && kp->appkey == 2)
3840                         continue;
3841
3842                 if(IS_SET(MODE_APPCURSOR) ? kp->appcursor < 0 : kp->appcursor > 0)
3843                         continue;
3844
3845                 if(IS_SET(MODE_CRLF) ? kp->crlf < 0 : kp->crlf > 0)
3846                         continue;
3847
3848                 return kp->s;
3849         }
3850
3851         return NULL;
3852 }
3853
3854 void
3855 kpress(XEvent *ev) {
3856         XKeyEvent *e = &ev->xkey;
3857         KeySym ksym;
3858         char buf[32], *customkey;
3859         int len;
3860         long c;
3861         Status status;
3862         Shortcut *bp;
3863
3864         if(IS_SET(MODE_KBDLOCK))
3865                 return;
3866
3867         len = XmbLookupString(xw.xic, e, buf, sizeof buf, &ksym, &status);
3868         /* 1. shortcuts */
3869         for(bp = shortcuts; bp < shortcuts + LEN(shortcuts); bp++) {
3870                 if(ksym == bp->keysym && match(bp->mod, e->state)) {
3871                         bp->func(&(bp->arg));
3872                         return;
3873                 }
3874         }
3875
3876         /* 2. custom keys from config.h */
3877         if((customkey = kmap(ksym, e->state))) {
3878                 ttysend(customkey, strlen(customkey));
3879                 return;
3880         }
3881
3882         /* 3. composed string from input method */
3883         if(len == 0)
3884                 return;
3885         if(len == 1 && e->state & Mod1Mask) {
3886                 if(IS_SET(MODE_8BIT)) {
3887                         if(*buf < 0177) {
3888                                 c = *buf | 0x80;
3889                                 len = utf8encode(c, buf, UTF_SIZ);
3890                         }
3891                 } else {
3892                         buf[1] = buf[0];
3893                         buf[0] = '\033';
3894                         len = 2;
3895                 }
3896         }
3897         ttysend(buf, len);
3898 }
3899
3900
3901 void
3902 cmessage(XEvent *e) {
3903         /*
3904          * See xembed specs
3905          *  http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html
3906          */
3907         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
3908                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
3909                         xw.state |= WIN_FOCUSED;
3910                         xseturgency(0);
3911                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
3912                         xw.state &= ~WIN_FOCUSED;
3913                 }
3914         } else if(e->xclient.data.l[0] == xw.wmdeletewin) {
3915                 /* Send SIGHUP to shell */
3916                 kill(pid, SIGHUP);
3917                 exit(EXIT_SUCCESS);
3918         }
3919 }
3920
3921 void
3922 cresize(int width, int height) {
3923         int col, row;
3924
3925         if(width != 0)
3926                 xw.w = width;
3927         if(height != 0)
3928                 xw.h = height;
3929
3930         col = (xw.w - 2 * borderpx) / xw.cw;
3931         row = (xw.h - 2 * borderpx) / xw.ch;
3932
3933         tresize(col, row);
3934         xresize(col, row);
3935         ttyresize();
3936 }
3937
3938 void
3939 resize(XEvent *e) {
3940         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
3941                 return;
3942
3943         cresize(e->xconfigure.width, e->xconfigure.height);
3944 }
3945
3946 void
3947 run(void) {
3948         XEvent ev;
3949         int w = xw.w, h = xw.h;
3950         fd_set rfd;
3951         int xfd = XConnectionNumber(xw.dpy), xev, blinkset = 0, dodraw = 0;
3952         struct timespec drawtimeout, *tv = NULL, now, last, lastblink;
3953         long deltatime;
3954
3955         /* Waiting for window mapping */
3956         do {
3957                 XNextEvent(xw.dpy, &ev);
3958                 if(ev.type == ConfigureNotify) {
3959                         w = ev.xconfigure.width;
3960                         h = ev.xconfigure.height;
3961                 }
3962         } while(ev.type != MapNotify);
3963
3964         ttynew();
3965         cresize(w, h);
3966
3967         clock_gettime(CLOCK_MONOTONIC, &last);
3968         lastblink = last;
3969
3970         for(xev = actionfps;;) {
3971                 FD_ZERO(&rfd);
3972                 FD_SET(cmdfd, &rfd);
3973                 FD_SET(xfd, &rfd);
3974
3975                 if(pselect(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, tv, NULL) < 0) {
3976                         if(errno == EINTR)
3977                                 continue;
3978                         die("select failed: %s\n", strerror(errno));
3979                 }
3980                 if(FD_ISSET(cmdfd, &rfd)) {
3981                         ttyread();
3982                         if(blinktimeout) {
3983                                 blinkset = tattrset(ATTR_BLINK);
3984                                 if(!blinkset)
3985                                         MODBIT(term.mode, 0, MODE_BLINK);
3986                         }
3987                 }
3988
3989                 if(FD_ISSET(xfd, &rfd))
3990                         xev = actionfps;
3991
3992                 clock_gettime(CLOCK_MONOTONIC, &now);
3993                 drawtimeout.tv_sec = 0;
3994                 drawtimeout.tv_nsec = (1000/xfps) * 1E6;
3995                 tv = &drawtimeout;
3996
3997                 dodraw = 0;
3998                 if(blinktimeout && TIMEDIFF(now, lastblink) > blinktimeout) {
3999                         tsetdirtattr(ATTR_BLINK);
4000                         term.mode ^= MODE_BLINK;
4001                         lastblink = now;
4002                         dodraw = 1;
4003                 }
4004                 deltatime = TIMEDIFF(now, last);
4005                 if(deltatime > (xev? (1000/xfps) : (1000/actionfps))
4006                                 || deltatime < 0) {
4007                         dodraw = 1;
4008                         last = now;
4009                 }
4010
4011                 if(dodraw) {
4012                         while(XPending(xw.dpy)) {
4013                                 XNextEvent(xw.dpy, &ev);
4014                                 if(XFilterEvent(&ev, None))
4015                                         continue;
4016                                 if(handler[ev.type])
4017                                         (handler[ev.type])(&ev);
4018                         }
4019
4020                         draw();
4021                         XFlush(xw.dpy);
4022
4023                         if(xev && !FD_ISSET(xfd, &rfd))
4024                                 xev--;
4025                         if(!FD_ISSET(cmdfd, &rfd) && !FD_ISSET(xfd, &rfd)) {
4026                                 if(blinkset) {
4027                                         if(TIMEDIFF(now, lastblink) \
4028                                                         > blinktimeout) {
4029                                                 drawtimeout.tv_nsec = 1000;
4030                                         } else {
4031                                                 drawtimeout.tv_nsec = (1E6 * \
4032                                                         (blinktimeout - \
4033                                                         TIMEDIFF(now,
4034                                                                 lastblink)));
4035                                         }
4036                                         drawtimeout.tv_sec = \
4037                                             drawtimeout.tv_nsec / 1E9;
4038                                         drawtimeout.tv_nsec %= (long)1E9;
4039                                 } else {
4040                                         tv = NULL;
4041                                 }
4042                         }
4043                 }
4044         }
4045 }
4046
4047 void
4048 usage(void) {
4049         die("%s " VERSION " (c) 2010-2015 st engineers\n"
4050         "usage: st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
4051         "          [-i] [-t title] [-w windowid] [-e command ...] [command ...]\n"
4052         "       st [-a] [-v] [-c class] [-f font] [-g geometry] [-o file]\n"
4053         "          [-i] [-t title] [-w windowid] [-l line] [stty_args ...]\n",
4054         argv0);
4055 }
4056
4057 int
4058 main(int argc, char *argv[]) {
4059         uint cols = 80, rows = 24;
4060
4061         xw.l = xw.t = 0;
4062         xw.isfixed = False;
4063         xw.cursor = 0;
4064
4065         ARGBEGIN {
4066         case 'a':
4067                 allowaltscreen = false;
4068                 break;
4069         case 'c':
4070                 opt_class = EARGF(usage());
4071                 break;
4072         case 'e':
4073                 if(argc > 1)
4074                         --argc, ++argv;
4075                 goto run;
4076         case 'f':
4077                 opt_font = EARGF(usage());
4078                 break;
4079         case 'g':
4080                 xw.gm = XParseGeometry(EARGF(usage()),
4081                                 &xw.l, &xw.t, &cols, &rows);
4082                 break;
4083         case 'i':
4084                 xw.isfixed = True;
4085                 break;
4086         case 'o':
4087                 opt_io = EARGF(usage());
4088                 break;
4089         case 'l':
4090                 opt_line = EARGF(usage());
4091                 break;
4092         case 't':
4093                 opt_title = EARGF(usage());
4094                 break;
4095         case 'w':
4096                 opt_embed = EARGF(usage());
4097                 break;
4098         case 'v':
4099         default:
4100                 usage();
4101         } ARGEND;
4102
4103 run:
4104         if(argc > 0) {
4105                 /* eat all remaining arguments */
4106                 opt_cmd = argv;
4107                 if(!opt_title)
4108                         opt_title = basename(xstrdup(argv[0]));
4109         }
4110         setlocale(LC_CTYPE, "");
4111         XSetLocaleModifiers("");
4112         tnew(MAX(cols, 1), MAX(rows, 1));
4113         xinit();
4114         selinit();
4115         run();
4116
4117         return 0;
4118 }
4119