st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.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 <sys/ioctl.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/cursorfont.h>
  26 #include <X11/keysym.h>
  27 #include <X11/extensions/Xdbe.h>
  28
  29 #if   defined(__linux)
  30  #include <pty.h>
  31 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  32  #include <util.h>
  33 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  34  #include <libutil.h>
  35 #endif
  36
  37 #define USAGE \
  38         "st " VERSION " (c) 2010-2012 st engineers\n" \
  39         "usage: st [-t title] [-c class] [-g geometry]" \
  40         " [-w windowid] [-v] [-f file] [-e command...]\n"
  41
  42 /* XEMBED messages */
  43 #define XEMBED_FOCUS_IN  4
  44 #define XEMBED_FOCUS_OUT 5
  45
  46 /* Arbitrary sizes */
  47 #define ESC_BUF_SIZ   256
  48 #define ESC_ARG_SIZ   16
  49 #define STR_BUF_SIZ   256
  50 #define STR_ARG_SIZ   16
  51 #define DRAW_BUF_SIZ  1024
  52 #define UTF_SIZ       4
  53 #define XK_NO_MOD     UINT_MAX
  54 #define XK_ANY_MOD    0
  55
  56 #define SELECT_TIMEOUT (20*1000) /* 20 ms */
  57 #define DRAW_TIMEOUT  (20*1000) /* 20 ms */
  58 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  59
  60 #define SERRNO strerror(errno)
  61 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  62 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  63 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  64 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  65 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  66 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  67 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  68 #define IS_SET(flag) (term.mode & (flag))
  69 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  70 #define X2COL(x) (((x) - BORDER)/xw.cw)
  71 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  72
  73 enum glyph_attribute {
  74         ATTR_NULL      = 0,
  75         ATTR_REVERSE   = 1,
  76         ATTR_UNDERLINE = 2,
  77         ATTR_BOLD      = 4,
  78         ATTR_GFX       = 8,
  79         ATTR_ITALIC    = 16,
  80         ATTR_BLINK     = 32,
  81 };
  82
  83 enum cursor_movement {
  84         CURSOR_UP,
  85         CURSOR_DOWN,
  86         CURSOR_LEFT,
  87         CURSOR_RIGHT,
  88         CURSOR_SAVE,
  89         CURSOR_LOAD
  90 };
  91
  92 enum cursor_state {
  93         CURSOR_DEFAULT  = 0,
  94         CURSOR_HIDE     = 1,
  95         CURSOR_WRAPNEXT = 2
  96 };
  97
  98 enum glyph_state {
  99         GLYPH_SET   = 1,
 100         GLYPH_DIRTY = 2
 101 };
 102
 103 enum term_mode {
 104         MODE_WRAP       = 1,
 105         MODE_INSERT      = 2,
 106         MODE_APPKEYPAD   = 4,
 107         MODE_ALTSCREEN   = 8,
 108         MODE_CRLF       = 16,
 109         MODE_MOUSEBTN    = 32,
 110         MODE_MOUSEMOTION = 64,
 111         MODE_MOUSE       = 32|64,
 112         MODE_REVERSE     = 128
 113 };
 114
 115 enum escape_state {
 116         ESC_START      = 1,
 117         ESC_CSI = 2,
 118         ESC_STR = 4, /* DSC, OSC, PM, APC */
 119         ESC_ALTCHARSET = 8,
 120         ESC_STR_END    = 16, /* a final string was encountered */
 121 };
 122
 123 enum window_state {
 124         WIN_VISIBLE = 1,
 125         WIN_REDRAW  = 2,
 126         WIN_FOCUSED = 4
 127 };
 128
 129 /* bit macro */
 130 #undef B0
 131 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 132
 133 typedef unsigned char uchar;
 134 typedef unsigned int uint;
 135 typedef unsigned long ulong;
 136 typedef unsigned short ushort;
 137
 138 typedef struct {
 139         char c[UTF_SIZ];     /* character code */
 140         uchar mode;  /* attribute flags */
 141         ushort fg;   /* foreground  */
 142         ushort bg;   /* background  */
 143         uchar state; /* state flags    */
 144 } Glyph;
 145
 146 typedef Glyph* Line;
 147
 148 typedef struct {
 149         Glyph attr;      /* current char attributes */
 150         int x;
 151         int y;
 152         char state;
 153 } TCursor;
 154
 155 /* CSI Escape sequence structs */
 156 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 157 typedef struct {
 158         char buf[ESC_BUF_SIZ]; /* raw string */
 159         int len;               /* raw string length */
 160         char priv;
 161         int arg[ESC_ARG_SIZ];
 162         int narg;             /* nb of args */
 163         char mode;
 164 } CSIEscape;
 165
 166 /* STR Escape sequence structs */
 167 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 168 typedef struct {
 169         char type;           /* ESC type ... */
 170         char buf[STR_BUF_SIZ]; /* raw string */
 171         int len;               /* raw string length */
 172         char *args[STR_ARG_SIZ];
 173         int narg;             /* nb of args */
 174 } STREscape;
 175
 176 /* Internal representation of the screen */
 177 typedef struct {
 178         int row;        /* nb row */
 179         int col;        /* nb col */
 180         Line* line;     /* screen */
 181         Line* alt;      /* alternate screen */
 182         bool* dirty;    /* dirtyness of lines */
 183         TCursor c;      /* cursor */
 184         int top;        /* top    scroll limit */
 185         int bot;        /* bottom scroll limit */
 186         int mode;       /* terminal mode flags */
 187         int esc;        /* escape state flags */
 188         bool *tabs;
 189 } Term;
 190
 191 /* Purely graphic info */
 192 typedef struct {
 193         Display* dpy;
 194         Colormap cmap;
 195         Window win;
 196         XdbeBackBuffer buf;
 197         Atom xembed;
 198         XIM xim;
 199         XIC xic;
 200         int scr;
 201         Bool isfixed; /* is fixed geometry? */
 202         int fx, fy, fw, fh; /* fixed geometry */
 203         int w;  /* window width */
 204         int h;  /* window height */
 205         int ch; /* char height */
 206         int cw; /* char width  */
 207         char state; /* focus, redraw, visible */
 208         struct timeval lastdraw;
 209 } XWindow;
 210
 211 typedef struct {
 212         KeySym k;
 213         uint mask;
 214         char s[ESC_BUF_SIZ];
 215 } Key;
 216
 217
 218 /* TODO: use better name for vars... */
 219 typedef struct {
 220         int mode;
 221         int bx, by;
 222         int ex, ey;
 223         struct {int x, y;} b, e;
 224         char *clip;
 225         Atom xtarget;
 226         bool alt;
 227         struct timeval tclick1;
 228         struct timeval tclick2;
 229 } Selection;
 230
 231 #include "config.h"
 232
 233 /* Drawing Context */
 234 typedef struct {
 235         ulong col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 236         GC gc;
 237         struct {
 238                 int ascent;
 239                 int descent;
 240                 short lbearing;
 241                 short rbearing;
 242                 XFontSet set;
 243         } font, bfont, ifont;
 244 } DC;
 245
 246 static void die(const char*, ...);
 247 static void draw(void);
 248 static void redraw(void);
 249 static void drawregion(int, int, int, int);
 250 static void execsh(void);
 251 static void sigchld(int);
 252 static void run(void);
 253 static bool last_draw_too_old(void);
 254
 255 static void csidump(void);
 256 static void csihandle(void);
 257 static void csiparse(void);
 258 static void csireset(void);
 259 static void strdump(void);
 260 static void strhandle(void);
 261 static void strparse(void);
 262 static void strreset(void);
 263
 264 static void tclearregion(int, int, int, int);
 265 static void tcursor(int);
 266 static void tdeletechar(int);
 267 static void tdeleteline(int);
 268 static void tinsertblank(int);
 269 static void tinsertblankline(int);
 270 static void tmoveto(int, int);
 271 static void tnew(int, int);
 272 static void tnewline(int);
 273 static void tputtab(bool);
 274 static void tputc(char*);
 275 static void treset(void);
 276 static int tresize(int, int);
 277 static void tscrollup(int, int);
 278 static void tscrolldown(int, int);
 279 static void tsetattr(int*, int);
 280 static void tsetchar(char*);
 281 static void tsetscroll(int, int);
 282 static void tswapscreen(void);
 283 static void tsetdirt(int, int);
 284 static void tsetmode(bool, bool, int *, int);
 285 static void tfulldirt(void);
 286
 287 static void ttynew(void);
 288 static void ttyread(void);
 289 static void ttyresize(int, int);
 290 static void ttywrite(const char *, size_t);
 291
 292 static void xdraws(char *, Glyph, int, int, int, int);
 293 static void xhints(void);
 294 static void xclear(int, int, int, int);
 295 static void xcopy(void);
 296 static void xdrawcursor(void);
 297 static void xinit(void);
 298 static void xloadcols(void);
 299 static void xseturgency(int);
 300 static void xsetsel(char*);
 301 static void xresize(int, int);
 302
 303 static void expose(XEvent *);
 304 static void visibility(XEvent *);
 305 static void unmap(XEvent *);
 306 static char* kmap(KeySym, uint);
 307 static void kpress(XEvent *);
 308 static void cmessage(XEvent *);
 309 static void resize(XEvent *);
 310 static void focus(XEvent *);
 311 static void brelease(XEvent *);
 312 static void bpress(XEvent *);
 313 static void bmotion(XEvent *);
 314 static void selnotify(XEvent *);
 315 static void selclear(XEvent *);
 316 static void selrequest(XEvent *);
 317
 318 static void selinit(void);
 319 static inline bool selected(int, int);
 320 static void selcopy(void);
 321 static void selpaste(void);
 322 static void selscroll(int, int);
 323
 324 static int utf8decode(char *, long *);
 325 static int utf8encode(long *, char *);
 326 static int utf8size(char *);
 327 static int isfullutf8(char *, int);
 328
 329 static void *xmalloc(size_t);
 330 static void *xrealloc(void *, size_t);
 331
 332 static void (*handler[LASTEvent])(XEvent *) = {
 333         [KeyPress] = kpress,
 334         [ClientMessage] = cmessage,
 335         [ConfigureNotify] = resize,
 336         [VisibilityNotify] = visibility,
 337         [UnmapNotify] = unmap,
 338         [Expose] = expose,
 339         [FocusIn] = focus,
 340         [FocusOut] = focus,
 341         [MotionNotify] = bmotion,
 342         [ButtonPress] = bpress,
 343         [ButtonRelease] = brelease,
 344         [SelectionClear] = selclear,
 345         [SelectionNotify] = selnotify,
 346         [SelectionRequest] = selrequest,
 347 };
 348
 349 /* Globals */
 350 static DC dc;
 351 static XWindow xw;
 352 static Term term;
 353 static CSIEscape csiescseq;
 354 static STREscape strescseq;
 355 static int cmdfd;
 356 static pid_t pid;
 357 static Selection sel;
 358 static FILE *fileio;
 359 static char **opt_cmd  = NULL;
 360 static char *opt_io    = NULL;
 361 static char *opt_title = NULL;
 362 static char *opt_embed = NULL;
 363 static char *opt_class = NULL;
 364
 365 void *
 366 xmalloc(size_t len) {
 367         void *p = malloc(len);
 368         if(!p)
 369                 die("Out of memory");
 370         return p;
 371 }
 372
 373 void *
 374 xrealloc(void *p, size_t len) {
 375         if((p = realloc(p, len)) == NULL)
 376                 die("Out of memory");
 377         return p;
 378 }
 379
 380 int
 381 utf8decode(char *s, long *u) {
 382         uchar c;
 383         int i, n, rtn;
 384
 385         rtn = 1;
 386         c = *s;
 387         if(~c & B7) { /* 0xxxxxxx */
 388                 *u = c;
 389                 return rtn;
 390         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 391                 *u = c&(B4|B3|B2|B1|B0);
 392                 n = 1;
 393         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 394                 *u = c&(B3|B2|B1|B0);
 395                 n = 2;
 396         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 397                 *u = c & (B2|B1|B0);
 398                 n = 3;
 399         } else
 400                 goto invalid;
 401         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 402                 c = *s;
 403                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 404                         goto invalid;
 405                 *u <<= 6;
 406                 *u |= c & (B5|B4|B3|B2|B1|B0);
 407         }
 408         if((n == 1 && *u < 0x80) ||
 409            (n == 2 && *u < 0x800) ||
 410            (n == 3 && *u < 0x10000) ||
 411            (*u >= 0xD800 && *u <= 0xDFFF))
 412                 goto invalid;
 413         return rtn;
 414 invalid:
 415         *u = 0xFFFD;
 416         return rtn;
 417 }
 418
 419 int
 420 utf8encode(long *u, char *s) {
 421         uchar *sp;
 422         ulong uc;
 423         int i, n;
 424
 425         sp = (uchar*) s;
 426         uc = *u;
 427         if(uc < 0x80) {
 428                 *sp = uc; /* 0xxxxxxx */
 429                 return 1;
 430         } else if(*u < 0x800) {
 431                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 432                 n = 1;
 433         } else if(uc < 0x10000) {
 434                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 435                 n = 2;
 436         } else if(uc <= 0x10FFFF) {
 437                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 438                 n = 3;
 439         } else {
 440                 goto invalid;
 441         }
 442         for(i=n,++sp; i>0; --i,++sp)
 443                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 444         return n+1;
 445 invalid:
 446         /* U+FFFD */
 447         *s++ = '\xEF';
 448         *s++ = '\xBF';
 449         *s = '\xBD';
 450         return 3;
 451 }
 452
 453 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 454    UTF-8 otherwise return 0 */
 455 int
 456 isfullutf8(char *s, int b) {
 457         uchar *c1, *c2, *c3;
 458
 459         c1 = (uchar *) s;
 460         c2 = (uchar *) ++s;
 461         c3 = (uchar *) ++s;
 462         if(b < 1)
 463                 return 0;
 464         else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
 465                 return 0;
 466         else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 467             ((b == 1) ||
 468             ((b == 2) && (*c2&(B7|B6)) == B7)))
 469                 return 0;
 470         else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 471             ((b == 1) ||
 472             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 473             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
 474                 return 0;
 475         else
 476                 return 1;
 477 }
 478
 479 int
 480 utf8size(char *s) {
 481         uchar c = *s;
 482
 483         if(~c&B7)
 484                 return 1;
 485         else if((c&(B7|B6|B5)) == (B7|B6))
 486                 return 2;
 487         else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 488                 return 3;
 489         else
 490                 return 4;
 491 }
 492
 493 void
 494 selinit(void) {
 495         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 496         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 497         sel.mode = 0;
 498         sel.bx = -1;
 499         sel.clip = NULL;
 500         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 501         if(sel.xtarget == None)
 502                 sel.xtarget = XA_STRING;
 503 }
 504
 505 static inline bool
 506 selected(int x, int y) {
 507         if(sel.ey == y && sel.by == y) {
 508                 int bx = MIN(sel.bx, sel.ex);
 509                 int ex = MAX(sel.bx, sel.ex);
 510                 return BETWEEN(x, bx, ex);
 511         }
 512         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 513                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 514 }
 515
 516 void
 517 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 518         if(b)
 519                 *b = e->xbutton.button;
 520
 521         *x = X2COL(e->xbutton.x);
 522         *y = Y2ROW(e->xbutton.y);
 523         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 524         sel.b.y = MIN(sel.by, sel.ey);
 525         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 526         sel.e.y = MAX(sel.by, sel.ey);
 527 }
 528
 529 void
 530 mousereport(XEvent *e) {
 531         int x = X2COL(e->xbutton.x);
 532         int y = Y2ROW(e->xbutton.y);
 533         int button = e->xbutton.button;
 534         int state = e->xbutton.state;
 535         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 536         static int ob, ox, oy;
 537
 538         /* from urxvt */
 539         if(e->xbutton.type == MotionNotify) {
 540                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 541                         return;
 542                 button = ob + 32;
 543                 ox = x, oy = y;
 544         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 545                 button = 3;
 546         } else {
 547                 button -= Button1;
 548                 if(button >= 3)
 549                         button += 64 - 3;
 550                 if(e->xbutton.type == ButtonPress) {
 551                         ob = button;
 552                         ox = x, oy = y;
 553                 }
 554         }
 555
 556         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 557                 + (state & Mod4Mask    ? 8  : 0)
 558                 + (state & ControlMask ? 16 : 0);
 559
 560         ttywrite(buf, sizeof(buf));
 561 }
 562
 563 void
 564 bpress(XEvent *e) {
 565         if(IS_SET(MODE_MOUSE))
 566                 mousereport(e);
 567         else if(e->xbutton.button == Button1) {
 568                 if(sel.bx != -1)
 569                         tsetdirt(sel.b.y, sel.e.y);
 570                 sel.mode = 1;
 571                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 572                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 573         }
 574 }
 575
 576 void
 577 selcopy(void) {
 578         char *str, *ptr;
 579         int x, y, bufsize, is_selected = 0;
 580
 581         if(sel.bx == -1)
 582                 str = NULL;
 583
 584         else {
 585                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 586                 ptr = str = xmalloc(bufsize);
 587
 588                 /* append every set & selected glyph to the selection */
 589                 for(y = 0; y < term.row; y++) {
 590                         for(x = 0; x < term.col; x++) {
 591                                 is_selected = selected(x, y);
 592                                 if((term.line[y][x].state & GLYPH_SET) && is_selected) {
 593                                         int size = utf8size(term.line[y][x].c);
 594                                         memcpy(ptr, term.line[y][x].c, size);
 595                                         ptr += size;
 596                                 }
 597                         }
 598
 599                         /* \n at the end of every selected line except for the last one */
 600                         if(is_selected && y < sel.e.y)
 601                                 *ptr++ = '\n';
 602                 }
 603                 *ptr = 0;
 604         }
 605         sel.alt = IS_SET(MODE_ALTSCREEN);
 606         xsetsel(str);
 607 }
 608
 609 void
 610 selnotify(XEvent *e) {
 611         ulong nitems, ofs, rem;
 612         int format;
 613         uchar *data;
 614         Atom type;
 615
 616         ofs = 0;
 617         do {
 618                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 619                                         False, AnyPropertyType, &type, &format,
 620                                         &nitems, &rem, &data)) {
 621                         fprintf(stderr, "Clipboard allocation failed\n");
 622                         return;
 623                 }
 624                 ttywrite((const char *) data, nitems * format / 8);
 625                 XFree(data);
 626                 /* number of 32-bit chunks returned */
 627                 ofs += nitems * format / 32;
 628         } while(rem > 0);
 629 }
 630
 631 void
 632 selpaste() {
 633         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
 634 }
 635
 636 void selclear(XEvent *e) {
 637         if(sel.bx == -1)
 638                 return;
 639         sel.bx = -1;
 640         tsetdirt(sel.b.y, sel.e.y);
 641         draw();
 642 }
 643
 644 void
 645 selrequest(XEvent *e) {
 646         XSelectionRequestEvent *xsre;
 647         XSelectionEvent xev;
 648         Atom xa_targets;
 649
 650         xsre = (XSelectionRequestEvent *) e;
 651         xev.type = SelectionNotify;
 652         xev.requestor = xsre->requestor;
 653         xev.selection = xsre->selection;
 654         xev.target = xsre->target;
 655         xev.time = xsre->time;
 656         /* reject */
 657         xev.property = None;
 658
 659         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 660         if(xsre->target == xa_targets) {
 661                 /* respond with the supported type */
 662                 Atom string = sel.xtarget;
 663                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 664                                 XA_ATOM, 32, PropModeReplace,
 665                                 (uchar *) &string, 1);
 666                 xev.property = xsre->property;
 667         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 668                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 669                                 xsre->target, 8, PropModeReplace,
 670                                 (uchar *) sel.clip, strlen(sel.clip));
 671                 xev.property = xsre->property;
 672         }
 673
 674         /* all done, send a notification to the listener */
 675         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 676                 fprintf(stderr, "Error sending SelectionNotify event\n");
 677 }
 678
 679 void
 680 xsetsel(char *str) {
 681         /* register the selection for both the clipboard and the primary */
 682         Atom clipboard;
 683
 684         free(sel.clip);
 685         sel.clip = str;
 686
 687         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 688
 689         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 690         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 691
 692         XFlush(xw.dpy);
 693 }
 694
 695 void
 696 brelease(XEvent *e) {
 697         if(IS_SET(MODE_MOUSE)) {
 698                 mousereport(e);
 699                 return;
 700         }
 701         if(e->xbutton.button == Button2)
 702                 selpaste();
 703         else if(e->xbutton.button == Button1) {
 704                 sel.mode = 0;
 705                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 706                 term.dirty[sel.ey] = 1;
 707                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 708                         struct timeval now;
 709                         sel.bx = -1;
 710                         gettimeofday(&now, NULL);
 711
 712                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 713                                 /* triple click on the line */
 714                                 sel.b.x = sel.bx = 0;
 715                                 sel.e.x = sel.ex = term.col;
 716                                 sel.b.y = sel.e.y = sel.ey;
 717                                 selcopy();
 718                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 719                                 /* double click to select word */
 720                                 sel.bx = sel.ex;
 721                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 722                                           term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
 723                                 sel.b.x = sel.bx;
 724                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 725                                           term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
 726                                 sel.e.x = sel.ex;
 727                                 sel.b.y = sel.e.y = sel.ey;
 728                                 selcopy();
 729                         }
 730                 } else
 731                         selcopy();
 732         }
 733         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 734         gettimeofday(&sel.tclick1, NULL);
 735         draw();
 736 }
 737
 738 void
 739 bmotion(XEvent *e) {
 740         if(IS_SET(MODE_MOUSE)) {
 741                 mousereport(e);
 742                 return;
 743         }
 744         if(sel.mode) {
 745                 int oldey = sel.ey, oldex = sel.ex;
 746                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 747
 748                 if(oldey != sel.ey || oldex != sel.ex) {
 749                         int starty = MIN(oldey, sel.ey);
 750                         int endy = MAX(oldey, sel.ey);
 751                         tsetdirt(starty, endy);
 752                         draw();
 753                 }
 754         }
 755 }
 756
 757 void
 758 die(const char *errstr, ...) {
 759         va_list ap;
 760
 761         va_start(ap, errstr);
 762         vfprintf(stderr, errstr, ap);
 763         va_end(ap);
 764         exit(EXIT_FAILURE);
 765 }
 766
 767 void
 768 execsh(void) {
 769         char **args;
 770         char *envshell = getenv("SHELL");
 771
 772         unsetenv("COLUMNS");
 773         unsetenv("LINES");
 774         unsetenv("TERMCAP");
 775
 776         DEFAULT(envshell, SHELL);
 777         putenv("TERM="TNAME);
 778         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 779         execvp(args[0], args);
 780         exit(EXIT_FAILURE);
 781 }
 782
 783 void
 784 sigchld(int a) {
 785         int stat = 0;
 786         if(waitpid(pid, &stat, 0) < 0)
 787                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 788         if(WIFEXITED(stat))
 789                 exit(WEXITSTATUS(stat));
 790         else
 791                 exit(EXIT_FAILURE);
 792 }
 793
 794 void
 795 ttynew(void) {
 796         int m, s;
 797
 798         /* seems to work fine on linux, openbsd and freebsd */
 799         struct winsize w = {term.row, term.col, 0, 0};
 800         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 801                 die("openpty failed: %s\n", SERRNO);
 802
 803         switch(pid = fork()) {
 804         case -1:
 805                 die("fork failed\n");
 806                 break;
 807         case 0:
 808                 setsid(); /* create a new process group */
 809                 dup2(s, STDIN_FILENO);
 810                 dup2(s, STDOUT_FILENO);
 811                 dup2(s, STDERR_FILENO);
 812                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 813                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 814                 close(s);
 815                 close(m);
 816                 execsh();
 817                 break;
 818         default:
 819                 close(s);
 820                 cmdfd = m;
 821                 signal(SIGCHLD, sigchld);
 822                 if(opt_io) {
 823                         if(!strcmp(opt_io, "-")) {
 824                                 fileio = stdout;
 825                         } else {
 826                                 if(!(fileio = fopen(opt_io, "w"))) {
 827                                         fprintf(stderr, "Error opening %s:%s\n",
 828                                                 opt_io, strerror(errno));
 829                                 }
 830                         }
 831                 }
 832         }
 833 }
 834
 835 void
 836 dump(char c) {
 837         static int col;
 838         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 839         if(++col % 10 == 0)
 840                 fprintf(stderr, "\n");
 841 }
 842
 843 void
 844 ttyread(void) {
 845         static char buf[BUFSIZ];
 846         static int buflen = 0;
 847         char *ptr;
 848         char s[UTF_SIZ];
 849         int charsize; /* size of utf8 char in bytes */
 850         long utf8c;
 851         int ret;
 852
 853         /* append read bytes to unprocessed bytes */
 854         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 855                 die("Couldn't read from shell: %s\n", SERRNO);
 856
 857         /* process every complete utf8 char */
 858         buflen += ret;
 859         ptr = buf;
 860         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 861                 charsize = utf8decode(ptr, &utf8c);
 862                 utf8encode(&utf8c, s);
 863                 tputc(s);
 864                 ptr    += charsize;
 865                 buflen -= charsize;
 866         }
 867
 868         /* keep any uncomplete utf8 char for the next call */
 869         memmove(buf, ptr, buflen);
 870 }
 871
 872 void
 873 ttywrite(const char *s, size_t n) {
 874         if(write(cmdfd, s, n) == -1)
 875                 die("write error on tty: %s\n", SERRNO);
 876 }
 877
 878 void
 879 ttyresize(int x, int y) {
 880         struct winsize w;
 881
 882         w.ws_row = term.row;
 883         w.ws_col = term.col;
 884         w.ws_xpixel = xw.w;
 885         w.ws_ypixel = xw.h;
 886         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 887                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 888 }
 889
 890 void
 891 tsetdirt(int top, int bot)
 892 {
 893         int i;
 894
 895         LIMIT(top, 0, term.row-1);
 896         LIMIT(bot, 0, term.row-1);
 897
 898         for(i = top; i <= bot; i++)
 899                 term.dirty[i] = 1;
 900 }
 901
 902 void
 903 tfulldirt(void)
 904 {
 905         tsetdirt(0, term.row-1);
 906 }
 907
 908 void
 909 tcursor(int mode) {
 910         static TCursor c;
 911
 912         if(mode == CURSOR_SAVE)
 913                 c = term.c;
 914         else if(mode == CURSOR_LOAD)
 915                 term.c = c, tmoveto(c.x, c.y);
 916 }
 917
 918 void
 919 treset(void) {
 920         unsigned i;
 921         term.c = (TCursor){{
 922                 .mode = ATTR_NULL,
 923                 .fg = DefaultFG,
 924                 .bg = DefaultBG
 925         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 926
 927         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 928         for(i = TAB; i < term.col; i += TAB)
 929                 term.tabs[i] = 1;
 930         term.top = 0, term.bot = term.row - 1;
 931         term.mode = MODE_WRAP;
 932         tclearregion(0, 0, term.col-1, term.row-1);
 933 }
 934
 935 void
 936 tnew(int col, int row) {
 937         /* set screen size */
 938         term.row = row, term.col = col;
 939         term.line = xmalloc(term.row * sizeof(Line));
 940         term.alt  = xmalloc(term.row * sizeof(Line));
 941         term.dirty = xmalloc(term.row * sizeof(*term.dirty));
 942         term.tabs = xmalloc(term.col * sizeof(*term.tabs));
 943
 944         for(row = 0; row < term.row; row++) {
 945                 term.line[row] = xmalloc(term.col * sizeof(Glyph));
 946                 term.alt [row] = xmalloc(term.col * sizeof(Glyph));
 947                 term.dirty[row] = 0;
 948         }
 949         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 950         /* setup screen */
 951         treset();
 952 }
 953
 954 void
 955 tswapscreen(void) {
 956         Line* tmp = term.line;
 957         term.line = term.alt;
 958         term.alt = tmp;
 959         term.mode ^= MODE_ALTSCREEN;
 960         tfulldirt();
 961 }
 962
 963 void
 964 tscrolldown(int orig, int n) {
 965         int i;
 966         Line temp;
 967
 968         LIMIT(n, 0, term.bot-orig+1);
 969
 970         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 971
 972         for(i = term.bot; i >= orig+n; i--) {
 973                 temp = term.line[i];
 974                 term.line[i] = term.line[i-n];
 975                 term.line[i-n] = temp;
 976
 977                 term.dirty[i] = 1;
 978                 term.dirty[i-n] = 1;
 979         }
 980
 981         selscroll(orig, n);
 982 }
 983
 984 void
 985 tscrollup(int orig, int n) {
 986         int i;
 987         Line temp;
 988         LIMIT(n, 0, term.bot-orig+1);
 989
 990         tclearregion(0, orig, term.col-1, orig+n-1);
 991
 992         for(i = orig; i <= term.bot-n; i++) {
 993                  temp = term.line[i];
 994                  term.line[i] = term.line[i+n];
 995                  term.line[i+n] = temp;
 996
 997                  term.dirty[i] = 1;
 998                  term.dirty[i+n] = 1;
 999         }
1000
1001         selscroll(orig, -n);
1002 }
1003
1004 void
1005 selscroll(int orig, int n) {
1006         if(sel.bx == -1)
1007                 return;
1008
1009         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1010                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1011                         sel.bx = -1;
1012                         return;
1013                 }
1014                 if(sel.by < term.top) {
1015                         sel.by = term.top;
1016                         sel.bx = 0;
1017                 }
1018                 if(sel.ey > term.bot) {
1019                         sel.ey = term.bot;
1020                         sel.ex = term.col;
1021                 }
1022                 sel.b.y = sel.by, sel.b.x = sel.bx;
1023                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1024         }
1025 }
1026
1027 void
1028 tnewline(int first_col) {
1029         int y = term.c.y;
1030         if(y == term.bot)
1031                 tscrollup(term.top, 1);
1032         else
1033                 y++;
1034         tmoveto(first_col ? 0 : term.c.x, y);
1035 }
1036
1037 void
1038 csiparse(void) {
1039         /* int noarg = 1; */
1040         char *p = csiescseq.buf;
1041
1042         csiescseq.narg = 0;
1043         if(*p == '?')
1044                 csiescseq.priv = 1, p++;
1045
1046         while(p < csiescseq.buf+csiescseq.len) {
1047                 while(isdigit(*p)) {
1048                         csiescseq.arg[csiescseq.narg] *= 10;
1049                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1050                 }
1051                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ)
1052                         csiescseq.narg++, p++;
1053                 else {
1054                         csiescseq.mode = *p;
1055                         csiescseq.narg++;
1056                         return;
1057                 }
1058         }
1059 }
1060
1061 void
1062 tmoveto(int x, int y) {
1063         LIMIT(x, 0, term.col-1);
1064         LIMIT(y, 0, term.row-1);
1065         term.c.state &= ~CURSOR_WRAPNEXT;
1066         term.c.x = x;
1067         term.c.y = y;
1068 }
1069
1070 void
1071 tsetchar(char *c) {
1072         term.dirty[term.c.y] = 1;
1073         term.line[term.c.y][term.c.x] = term.c.attr;
1074         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
1075         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
1076 }
1077
1078 void
1079 tclearregion(int x1, int y1, int x2, int y2) {
1080         int x, y, temp;
1081
1082         if(x1 > x2)
1083                 temp = x1, x1 = x2, x2 = temp;
1084         if(y1 > y2)
1085                 temp = y1, y1 = y2, y2 = temp;
1086
1087         LIMIT(x1, 0, term.col-1);
1088         LIMIT(x2, 0, term.col-1);
1089         LIMIT(y1, 0, term.row-1);
1090         LIMIT(y2, 0, term.row-1);
1091
1092         for(y = y1; y <= y2; y++) {
1093                 term.dirty[y] = 1;
1094                 for(x = x1; x <= x2; x++)
1095                         term.line[y][x].state = 0;
1096         }
1097 }
1098
1099 void
1100 tdeletechar(int n) {
1101         int src = term.c.x + n;
1102         int dst = term.c.x;
1103         int size = term.col - src;
1104
1105         term.dirty[term.c.y] = 1;
1106
1107         if(src >= term.col) {
1108                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1109                 return;
1110         }
1111         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1112         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1113 }
1114
1115 void
1116 tinsertblank(int n) {
1117         int src = term.c.x;
1118         int dst = src + n;
1119         int size = term.col - dst;
1120
1121         term.dirty[term.c.y] = 1;
1122
1123         if(dst >= term.col) {
1124                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1125                 return;
1126         }
1127         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1128         tclearregion(src, term.c.y, dst - 1, term.c.y);
1129 }
1130
1131 void
1132 tinsertblankline(int n) {
1133         if(term.c.y < term.top || term.c.y > term.bot)
1134                 return;
1135
1136         tscrolldown(term.c.y, n);
1137 }
1138
1139 void
1140 tdeleteline(int n) {
1141         if(term.c.y < term.top || term.c.y > term.bot)
1142                 return;
1143
1144         tscrollup(term.c.y, n);
1145 }
1146
1147 void
1148 tsetattr(int *attr, int l) {
1149         int i;
1150
1151         for(i = 0; i < l; i++) {
1152                 switch(attr[i]) {
1153                 case 0:
1154                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
1155                                         | ATTR_ITALIC | ATTR_BLINK);
1156                         term.c.attr.fg = DefaultFG;
1157                         term.c.attr.bg = DefaultBG;
1158                         break;
1159                 case 1:
1160                         term.c.attr.mode |= ATTR_BOLD;
1161                         break;
1162                 case 3: /* enter standout (highlight) */
1163                         term.c.attr.mode |= ATTR_ITALIC;
1164                         break;
1165                 case 4:
1166                         term.c.attr.mode |= ATTR_UNDERLINE;
1167                         break;
1168                 case 5:
1169                         term.c.attr.mode |= ATTR_BLINK;
1170                         break;
1171                 case 7:
1172                         term.c.attr.mode |= ATTR_REVERSE;
1173                         break;
1174                 case 22:
1175                         term.c.attr.mode &= ~ATTR_BOLD;
1176                         break;
1177                 case 23: /* leave standout (highlight) mode */
1178                         term.c.attr.mode &= ~ATTR_ITALIC;
1179                         break;
1180                 case 24:
1181                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1182                         break;
1183                 case 25:
1184                         term.c.attr.mode &= ~ATTR_BLINK;
1185                         break;
1186                 case 27:
1187                         term.c.attr.mode &= ~ATTR_REVERSE;
1188                         break;
1189                 case 38:
1190                         if(i + 2 < l && attr[i + 1] == 5) {
1191                                 i += 2;
1192                                 if(BETWEEN(attr[i], 0, 255))
1193                                         term.c.attr.fg = attr[i];
1194                                 else
1195                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
1196                         }
1197                         else
1198                                 fprintf(stderr, "erresc(38): gfx attr %d unknown\n", attr[i]);
1199                         break;
1200                 case 39:
1201                         term.c.attr.fg = DefaultFG;
1202                         break;
1203                 case 48:
1204                         if(i + 2 < l && attr[i + 1] == 5) {
1205                                 i += 2;
1206                                 if(BETWEEN(attr[i], 0, 255))
1207                                         term.c.attr.bg = attr[i];
1208                                 else
1209                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
1210                         }
1211                         else
1212                                 fprintf(stderr, "erresc(48): gfx attr %d unknown\n", attr[i]);
1213                         break;
1214                 case 49:
1215                         term.c.attr.bg = DefaultBG;
1216                         break;
1217                 default:
1218                         if(BETWEEN(attr[i], 30, 37))
1219                                 term.c.attr.fg = attr[i] - 30;
1220                         else if(BETWEEN(attr[i], 40, 47))
1221                                 term.c.attr.bg = attr[i] - 40;
1222                         else if(BETWEEN(attr[i], 90, 97))
1223                                 term.c.attr.fg = attr[i] - 90 + 8;
1224                         else if(BETWEEN(attr[i], 100, 107))
1225                                 term.c.attr.bg = attr[i] - 100 + 8;
1226                         else
1227                                 fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]), csidump();
1228                         break;
1229                 }
1230         }
1231 }
1232
1233 void
1234 tsetscroll(int t, int b) {
1235         int temp;
1236
1237         LIMIT(t, 0, term.row-1);
1238         LIMIT(b, 0, term.row-1);
1239         if(t > b) {
1240                 temp = t;
1241                 t = b;
1242                 b = temp;
1243         }
1244         term.top = t;
1245         term.bot = b;
1246 }
1247
1248 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1249
1250 void
1251 tsetmode(bool priv, bool set, int *args, int narg) {
1252         int *lim, mode;
1253
1254         for(lim = args + narg; args < lim; ++args) {
1255                 if(priv) {
1256                         switch(*args) {
1257                         case 1:
1258                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1259                                 break;
1260                         case 5: /* DECSCNM -- Reverve video */
1261                                 mode = term.mode;
1262                                 MODBIT(term.mode,set, MODE_REVERSE);
1263                                 if(mode != term.mode)
1264                                         redraw();
1265                                 break;
1266                         case 7:
1267                                 MODBIT(term.mode, set, MODE_WRAP);
1268                                 break;
1269                         case 20:
1270                                 MODBIT(term.mode, set, MODE_CRLF);
1271                                 break;
1272                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1273                                 break;
1274                         case 25:
1275                                 MODBIT(term.c.state, !set, CURSOR_HIDE);
1276                                 break;
1277                         case 1000: /* 1000,1002: enable xterm mouse report */
1278                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1279                                 break;
1280                         case 1002:
1281                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1282                                 break;
1283                         case 1049: /* = 1047 and 1048 */
1284                         case 47:
1285                         case 1047:
1286                                 if(IS_SET(MODE_ALTSCREEN))
1287                                         tclearregion(0, 0, term.col-1, term.row-1);
1288                                 if((set && !IS_SET(MODE_ALTSCREEN)) ||
1289                                     (!set && IS_SET(MODE_ALTSCREEN))) {
1290                                             tswapscreen();
1291                                 }
1292                                 if(*args != 1049)
1293                                         break;
1294                                 /* pass through */
1295                         case 1048:
1296                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1297                                 break;
1298                         default:
1299                                 fprintf(stderr,
1300                                         "erresc: unknown private set/reset mode %d\n",
1301                                         *args);
1302                                 break;
1303                         }
1304                 } else {
1305                         switch(*args) {
1306                         case 4:
1307                                 MODBIT(term.mode, set, MODE_INSERT);
1308                                 break;
1309                         default:
1310                                 fprintf(stderr,
1311                                         "erresc: unknown set/reset mode %d\n",
1312                                         *args);
1313                                 break;
1314                         }
1315                 }
1316         }
1317 }
1318 #undef MODBIT
1319
1320
1321 void
1322 csihandle(void) {
1323         switch(csiescseq.mode) {
1324         default:
1325         unknown:
1326                 fprintf(stderr, "erresc: unknown csi ");
1327                 csidump();
1328                 /* die(""); */
1329                 break;
1330         case '@': /* ICH -- Insert <n> blank char */
1331                 DEFAULT(csiescseq.arg[0], 1);
1332                 tinsertblank(csiescseq.arg[0]);
1333                 break;
1334         case 'A': /* CUU -- Cursor <n> Up */
1335         case 'e':
1336                 DEFAULT(csiescseq.arg[0], 1);
1337                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1338                 break;
1339         case 'B': /* CUD -- Cursor <n> Down */
1340                 DEFAULT(csiescseq.arg[0], 1);
1341                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1342                 break;
1343         case 'C': /* CUF -- Cursor <n> Forward */
1344         case 'a':
1345                 DEFAULT(csiescseq.arg[0], 1);
1346                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1347                 break;
1348         case 'D': /* CUB -- Cursor <n> Backward */
1349                 DEFAULT(csiescseq.arg[0], 1);
1350                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1351                 break;
1352         case 'E': /* CNL -- Cursor <n> Down and first col */
1353                 DEFAULT(csiescseq.arg[0], 1);
1354                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1355                 break;
1356         case 'F': /* CPL -- Cursor <n> Up and first col */
1357                 DEFAULT(csiescseq.arg[0], 1);
1358                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1359                 break;
1360         case 'g': /* TBC -- Tabulation clear */
1361                 switch (csiescseq.arg[0]) {
1362                 case 0: /* clear current tab stop */
1363                         term.tabs[term.c.x] = 0;
1364                         break;
1365                 case 3: /* clear all the tabs */
1366                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1367                         break;
1368                 default:
1369                         goto unknown;
1370                 }
1371                 break;
1372         case 'G': /* CHA -- Move to <col> */
1373         case '`': /* HPA */
1374                 DEFAULT(csiescseq.arg[0], 1);
1375                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1376                 break;
1377         case 'H': /* CUP -- Move to <row> <col> */
1378         case 'f': /* HVP */
1379                 DEFAULT(csiescseq.arg[0], 1);
1380                 DEFAULT(csiescseq.arg[1], 1);
1381                 tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1382                 break;
1383         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1384                 DEFAULT(csiescseq.arg[0], 1);
1385                 while(csiescseq.arg[0]--)
1386                         tputtab(1);
1387                 break;
1388         case 'J': /* ED -- Clear screen */
1389                 sel.bx = -1;
1390                 switch(csiescseq.arg[0]) {
1391                 case 0: /* below */
1392                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1393                         if(term.c.y < term.row-1)
1394                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1395                         break;
1396                 case 1: /* above */
1397                         if(term.c.y > 1)
1398                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1399                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1400                         break;
1401                 case 2: /* all */
1402                         tclearregion(0, 0, term.col-1, term.row-1);
1403                         break;
1404                 default:
1405                         goto unknown;
1406                 }
1407                 break;
1408         case 'K': /* EL -- Clear line */
1409                 switch(csiescseq.arg[0]) {
1410                 case 0: /* right */
1411                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1412                         break;
1413                 case 1: /* left */
1414                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1415                         break;
1416                 case 2: /* all */
1417                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1418                         break;
1419                 }
1420                 break;
1421         case 'S': /* SU -- Scroll <n> line up */
1422                 DEFAULT(csiescseq.arg[0], 1);
1423                 tscrollup(term.top, csiescseq.arg[0]);
1424                 break;
1425         case 'T': /* SD -- Scroll <n> line down */
1426                 DEFAULT(csiescseq.arg[0], 1);
1427                 tscrolldown(term.top, csiescseq.arg[0]);
1428                 break;
1429         case 'L': /* IL -- Insert <n> blank lines */
1430                 DEFAULT(csiescseq.arg[0], 1);
1431                 tinsertblankline(csiescseq.arg[0]);
1432                 break;
1433         case 'l': /* RM -- Reset Mode */
1434                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1435                 break;
1436         case 'M': /* DL -- Delete <n> lines */
1437                 DEFAULT(csiescseq.arg[0], 1);
1438                 tdeleteline(csiescseq.arg[0]);
1439                 break;
1440         case 'X': /* ECH -- Erase <n> char */
1441                 DEFAULT(csiescseq.arg[0], 1);
1442                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1443                 break;
1444         case 'P': /* DCH -- Delete <n> char */
1445                 DEFAULT(csiescseq.arg[0], 1);
1446                 tdeletechar(csiescseq.arg[0]);
1447                 break;
1448         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1449                 DEFAULT(csiescseq.arg[0], 1);
1450                 while(csiescseq.arg[0]--)
1451                         tputtab(0);
1452                 break;
1453         case 'd': /* VPA -- Move to <row> */
1454                 DEFAULT(csiescseq.arg[0], 1);
1455                 tmoveto(term.c.x, csiescseq.arg[0]-1);
1456                 break;
1457         case 'h': /* SM -- Set terminal mode */
1458                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1459                 break;
1460         case 'm': /* SGR -- Terminal attribute (color) */
1461                 tsetattr(csiescseq.arg, csiescseq.narg);
1462                 break;
1463         case 'r': /* DECSTBM -- Set Scrolling Region */
1464                 if(csiescseq.priv)
1465                         goto unknown;
1466                 else {
1467                         DEFAULT(csiescseq.arg[0], 1);
1468                         DEFAULT(csiescseq.arg[1], term.row);
1469                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1470                         tmoveto(0, 0);
1471                 }
1472                 break;
1473         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1474                 tcursor(CURSOR_SAVE);
1475                 break;
1476         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1477                 tcursor(CURSOR_LOAD);
1478                 break;
1479         }
1480 }
1481
1482 void
1483 csidump(void) {
1484         int i;
1485         printf("ESC[");
1486         for(i = 0; i < csiescseq.len; i++) {
1487                 uint c = csiescseq.buf[i] & 0xff;
1488                 if(isprint(c)) putchar(c);
1489                 else if(c == '\n') printf("(\\n)");
1490                 else if(c == '\r') printf("(\\r)");
1491                 else if(c == 0x1b) printf("(\\e)");
1492                 else printf("(%02x)", c);
1493         }
1494         putchar('\n');
1495 }
1496
1497 void
1498 csireset(void) {
1499         memset(&csiescseq, 0, sizeof(csiescseq));
1500 }
1501
1502 void
1503 strhandle(void) {
1504         char *p;
1505
1506         /*
1507          * TODO: make this being useful in case of color palette change.
1508          */
1509         strparse();
1510
1511         p = strescseq.buf;
1512
1513         switch(strescseq.type) {
1514         case ']': /* OSC -- Operating System Command */
1515                 switch(p[0]) {
1516                 case '0':
1517                 case '1':
1518                 case '2':
1519                         /*
1520                          * TODO: Handle special chars in string, like umlauts.
1521                          */
1522                         if(p[1] == ';') {
1523                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1524                         }
1525                         break;
1526                 case ';':
1527                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1528                         break;
1529                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1530                         break;
1531                 default:
1532                         fprintf(stderr, "erresc: unknown str ");
1533                         strdump();
1534                         break;
1535                 }
1536                 break;
1537         case 'k': /* old title set compatibility */
1538                 XStoreName(xw.dpy, xw.win, strescseq.buf);
1539                 break;
1540         case 'P': /* DSC -- Device Control String */
1541         case '_': /* APC -- Application Program Command */
1542         case '^': /* PM -- Privacy Message */
1543         default:
1544                 fprintf(stderr, "erresc: unknown str ");
1545                 strdump();
1546                 /* die(""); */
1547                 break;
1548         }
1549 }
1550
1551 void
1552 strparse(void) {
1553         /*
1554          * TODO: Implement parsing like for CSI when required.
1555          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1556          */
1557         return;
1558 }
1559
1560 void
1561 strdump(void) {
1562         int i;
1563         printf("ESC%c", strescseq.type);
1564         for(i = 0; i < strescseq.len; i++) {
1565                 uint c = strescseq.buf[i] & 0xff;
1566                 if(isprint(c)) putchar(c);
1567                 else if(c == '\n') printf("(\\n)");
1568                 else if(c == '\r') printf("(\\r)");
1569                 else if(c == 0x1b) printf("(\\e)");
1570                 else printf("(%02x)", c);
1571         }
1572         printf("ESC\\\n");
1573 }
1574
1575 void
1576 strreset(void) {
1577         memset(&strescseq, 0, sizeof(strescseq));
1578 }
1579
1580 void
1581 tputtab(bool forward) {
1582         unsigned x = term.c.x;
1583
1584         if(forward) {
1585                 if(x == term.col)
1586                         return;
1587                 for(++x; x < term.col && !term.tabs[x]; ++x)
1588                         /* nothing */ ;
1589         } else {
1590                 if(x == 0)
1591                         return;
1592                 for(--x; x > 0 && !term.tabs[x]; --x)
1593                         /* nothing */ ;
1594         }
1595         tmoveto(x, term.c.y);
1596 }
1597
1598 void
1599 tputc(char *c) {
1600         char ascii = *c;
1601
1602         if(fileio) {
1603                 putc(ascii, fileio);
1604                 fflush(fileio);
1605         }
1606
1607         if(term.esc & ESC_START) {
1608                 if(term.esc & ESC_CSI) {
1609                         csiescseq.buf[csiescseq.len++] = ascii;
1610                         if(BETWEEN(ascii, 0x40, 0x7E) || csiescseq.len >= ESC_BUF_SIZ) {
1611                                 term.esc = 0;
1612                                 csiparse(), csihandle();
1613                         }
1614                 } else if(term.esc & ESC_STR) {
1615                         switch(ascii) {
1616                         case '\033':
1617                                 term.esc = ESC_START | ESC_STR_END;
1618                                 break;
1619                         case '\a': /* backwards compatibility to xterm */
1620                                 term.esc = 0;
1621                                 strhandle();
1622                                 break;
1623                         default:
1624                                 strescseq.buf[strescseq.len++] = ascii;
1625                                 if(strescseq.len+1 >= STR_BUF_SIZ) {
1626                                         term.esc = 0;
1627                                         strhandle();
1628                                 }
1629                         }
1630                 } else if(term.esc & ESC_STR_END) {
1631                         term.esc = 0;
1632                         if(ascii == '\\')
1633                                 strhandle();
1634                 } else if(term.esc & ESC_ALTCHARSET) {
1635                         switch(ascii) {
1636                         case '0': /* Line drawing crap */
1637                                 term.c.attr.mode |= ATTR_GFX;
1638                                 break;
1639                         case 'B': /* Back to regular text */
1640                                 term.c.attr.mode &= ~ATTR_GFX;
1641                                 break;
1642                         default:
1643                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1644                         }
1645                         term.esc = 0;
1646                 } else {
1647                         switch(ascii) {
1648                         case '[':
1649                                 term.esc |= ESC_CSI;
1650                                 break;
1651                         case 'P': /* DCS -- Device Control String */
1652                         case '_': /* APC -- Application Program Command */
1653                         case '^': /* PM -- Privacy Message */
1654                         case ']': /* OSC -- Operating System Command */
1655                         case 'k': /* old title set compatibility */
1656                                 strreset();
1657                                 strescseq.type = ascii;
1658                                 term.esc |= ESC_STR;
1659                                 break;
1660                         case '(':
1661                                 term.esc |= ESC_ALTCHARSET;
1662                                 break;
1663                         case 'D': /* IND -- Linefeed */
1664                                 if(term.c.y == term.bot)
1665                                         tscrollup(term.top, 1);
1666                                 else
1667                                         tmoveto(term.c.x, term.c.y+1);
1668                                 term.esc = 0;
1669                                 break;
1670                         case 'E': /* NEL -- Next line */
1671                                 tnewline(1); /* always go to first col */
1672                                 term.esc = 0;
1673                                 break;
1674                         case 'H': /* HTS -- Horizontal tab stop */
1675                                 term.tabs[term.c.x] = 1;
1676                                 term.esc = 0;
1677                                 break;
1678                         case 'M': /* RI -- Reverse index */
1679                                 if(term.c.y == term.top)
1680                                         tscrolldown(term.top, 1);
1681                                 else
1682                                         tmoveto(term.c.x, term.c.y-1);
1683                                 term.esc = 0;
1684                                 break;
1685                         case 'c': /* RIS -- Reset to inital state */
1686                                 treset();
1687                                 term.esc = 0;
1688                                 break;
1689                         case '=': /* DECPAM -- Application keypad */
1690                                 term.mode |= MODE_APPKEYPAD;
1691                                 term.esc = 0;
1692                                 break;
1693                         case '>': /* DECPNM -- Normal keypad */
1694                                 term.mode &= ~MODE_APPKEYPAD;
1695                                 term.esc = 0;
1696                                 break;
1697                         case '7': /* DECSC -- Save Cursor */
1698                                 tcursor(CURSOR_SAVE);
1699                                 term.esc = 0;
1700                                 break;
1701                         case '8': /* DECRC -- Restore Cursor */
1702                                 tcursor(CURSOR_LOAD);
1703                                 term.esc = 0;
1704                                 break;
1705                         case '\\': /* ST -- Stop */
1706                                 term.esc = 0;
1707                                 break;
1708                         default:
1709                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1710                                     (uchar) ascii, isprint(ascii)?ascii:'.');
1711                                 term.esc = 0;
1712                         }
1713                 }
1714         } else {
1715                 if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
1716                         sel.bx = -1;
1717                 switch(ascii) {
1718                 case '\t':
1719                         tputtab(1);
1720                         break;
1721                 case '\b':
1722                         tmoveto(term.c.x-1, term.c.y);
1723                         break;
1724                 case '\r':
1725                         tmoveto(0, term.c.y);
1726                         break;
1727                 case '\f':
1728                 case '\v':
1729                 case '\n':
1730                         /* go to first col if the mode is set */
1731                         tnewline(IS_SET(MODE_CRLF));
1732                         break;
1733                 case '\a':
1734                         if(!(xw.state & WIN_FOCUSED))
1735                                 xseturgency(1);
1736                         break;
1737                 case '\033':
1738                         csireset();
1739                         term.esc = ESC_START;
1740                         break;
1741                 default:
1742                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1743                                 tnewline(1); /* always go to first col */
1744                         tsetchar(c);
1745                         if(term.c.x+1 < term.col)
1746                                 tmoveto(term.c.x+1, term.c.y);
1747                         else
1748                                 term.c.state |= CURSOR_WRAPNEXT;
1749                 }
1750         }
1751 }
1752
1753 int
1754 tresize(int col, int row) {
1755         int i, x;
1756         int minrow = MIN(row, term.row);
1757         int mincol = MIN(col, term.col);
1758         int slide = term.c.y - row + 1;
1759
1760         if(col < 1 || row < 1)
1761                 return 0;
1762
1763         /* free unneeded rows */
1764         i = 0;
1765         if(slide > 0) {
1766                 /* slide screen to keep cursor where we expect it -
1767                  * tscrollup would work here, but we can optimize to
1768                  * memmove because we're freeing the earlier lines */
1769                 for(/* i = 0 */; i < slide; i++) {
1770                         free(term.line[i]);
1771                         free(term.alt[i]);
1772                 }
1773                 memmove(term.line, term.line + slide, row * sizeof(Line));
1774                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1775         }
1776         for(i += row; i < term.row; i++) {
1777                 free(term.line[i]);
1778                 free(term.alt[i]);
1779         }
1780
1781         /* resize to new height */
1782         term.line = xrealloc(term.line, row * sizeof(Line));
1783         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
1784         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
1785         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
1786
1787         /* resize each row to new width, zero-pad if needed */
1788         for(i = 0; i < minrow; i++) {
1789                 term.dirty[i] = 1;
1790                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
1791                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
1792                 for(x = mincol; x < col; x++) {
1793                         term.line[i][x].state = 0;
1794                         term.alt[i][x].state = 0;
1795                 }
1796         }
1797
1798         /* allocate any new rows */
1799         for(/* i == minrow */; i < row; i++) {
1800                 term.dirty[i] = 1;
1801                 term.line[i] = calloc(col, sizeof(Glyph));
1802                 term.alt [i] = calloc(col, sizeof(Glyph));
1803         }
1804         if(col > term.col) {
1805                 bool *bp = term.tabs + term.col;
1806
1807                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
1808                 while(--bp > term.tabs && !*bp)
1809                         /* nothing */ ;
1810                 for(bp += TAB; bp < term.tabs + col; bp += TAB)
1811                         *bp = 1;
1812         }
1813         /* update terminal size */
1814         term.col = col, term.row = row;
1815         /* make use of the LIMIT in tmoveto */
1816         tmoveto(term.c.x, term.c.y);
1817         /* reset scrolling region */
1818         tsetscroll(0, row-1);
1819
1820         return (slide > 0);
1821 }
1822
1823 void
1824 xresize(int col, int row) {
1825         xw.w = MAX(1, 2*BORDER + col * xw.cw);
1826         xw.h = MAX(1, 2*BORDER + row * xw.ch);
1827 }
1828
1829 void
1830 xloadcols(void) {
1831         int i, r, g, b;
1832         XColor color;
1833         ulong white = WhitePixel(xw.dpy, xw.scr);
1834
1835         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
1836         for(i = 0; i < LEN(colorname); i++) {
1837                 if(!colorname[i])
1838                         continue;
1839                 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1840                         dc.col[i] = white;
1841                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1842                 } else
1843                         dc.col[i] = color.pixel;
1844         }
1845
1846         /* load colors [16-255] ; same colors as xterm */
1847         for(i = 16, r = 0; r < 6; r++)
1848                 for(g = 0; g < 6; g++)
1849                         for(b = 0; b < 6; b++) {
1850                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1851                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1852                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
1853                                 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1854                                         dc.col[i] = white;
1855                                         fprintf(stderr, "Could not allocate color %d\n", i);
1856                                 } else
1857                                         dc.col[i] = color.pixel;
1858                                 i++;
1859                         }
1860
1861         for(r = 0; r < 24; r++, i++) {
1862                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1863                 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1864                         dc.col[i] = white;
1865                         fprintf(stderr, "Could not allocate color %d\n", i);
1866                 } else
1867                         dc.col[i] = color.pixel;
1868         }
1869 }
1870
1871 void
1872 xclear(int x1, int y1, int x2, int y2) {
1873         XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1874         XFillRectangle(xw.dpy, xw.buf, dc.gc,
1875                        BORDER + x1 * xw.cw, BORDER + y1 * xw.ch,
1876                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1877 }
1878
1879 void
1880 xhints(void) {
1881         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1882         XWMHints wm = {.flags = InputHint, .input = 1};
1883         XSizeHints *sizeh = NULL;
1884
1885         sizeh = XAllocSizeHints();
1886         if(xw.isfixed == False) {
1887                 sizeh->flags = PSize | PResizeInc | PBaseSize;
1888                 sizeh->height = xw.h;
1889                 sizeh->width = xw.w;
1890                 sizeh->height_inc = xw.ch;
1891                 sizeh->width_inc = xw.cw;
1892                 sizeh->base_height = 2*BORDER;
1893                 sizeh->base_width = 2*BORDER;
1894         } else {
1895                 sizeh->flags = PMaxSize | PMinSize;
1896                 sizeh->min_width = sizeh->max_width = xw.fw;
1897                 sizeh->min_height = sizeh->max_height = xw.fh;
1898         }
1899
1900         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
1901         XFree(sizeh);
1902 }
1903
1904 XFontSet
1905 xinitfont(char *fontstr) {
1906         XFontSet set;
1907         char *def, **missing;
1908         int n;
1909
1910         missing = NULL;
1911         set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1912         if(missing) {
1913                 while(n--)
1914                         fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1915                 XFreeStringList(missing);
1916         }
1917         return set;
1918 }
1919
1920 void
1921 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1922         XFontStruct **xfonts;
1923         char **font_names;
1924         int i, n;
1925
1926         *ascent = *descent = *lbearing = *rbearing = 0;
1927         n = XFontsOfFontSet(set, &xfonts, &font_names);
1928         for(i = 0; i < n; i++) {
1929                 *ascent = MAX(*ascent, (*xfonts)->ascent);
1930                 *descent = MAX(*descent, (*xfonts)->descent);
1931                 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1932                 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1933                 xfonts++;
1934         }
1935 }
1936
1937 void
1938 initfonts(char *fontstr, char *bfontstr, char *ifontstr) {
1939         if((dc.font.set = xinitfont(fontstr)) == NULL)
1940                 die("Can't load font %s\n", fontstr);
1941         if((dc.bfont.set = xinitfont(bfontstr)) == NULL)
1942                 die("Can't load bfont %s\n", bfontstr);
1943         if((dc.ifont.set = xinitfont(ifontstr)) == NULL)
1944                 die("Can't load ifont %s\n", ifontstr);
1945
1946         xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1947             &dc.font.lbearing, &dc.font.rbearing);
1948         xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1949             &dc.bfont.lbearing, &dc.bfont.rbearing);
1950         xgetfontinfo(dc.ifont.set, &dc.ifont.ascent, &dc.ifont.descent,
1951             &dc.ifont.lbearing, &dc.ifont.rbearing);
1952 }
1953
1954 void
1955 xinit(void) {
1956         XSetWindowAttributes attrs;
1957         Cursor cursor;
1958         Window parent;
1959         int sw, sh;
1960
1961         if(!(xw.dpy = XOpenDisplay(NULL)))
1962                 die("Can't open display\n");
1963         xw.scr = XDefaultScreen(xw.dpy);
1964
1965         /* font */
1966         initfonts(FONT, BOLDFONT, ITALICFONT);
1967
1968         /* XXX: Assuming same size for bold font */
1969         xw.cw = dc.font.rbearing - dc.font.lbearing;
1970         xw.ch = dc.font.ascent + dc.font.descent;
1971
1972         /* colors */
1973         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1974         xloadcols();
1975
1976         /* adjust fixed window geometry */
1977         if(xw.isfixed) {
1978                 sw = DisplayWidth(xw.dpy, xw.scr);
1979                 sh = DisplayHeight(xw.dpy, xw.scr);
1980                 if(xw.fx < 0)
1981                         xw.fx = sw + xw.fx - xw.fw - 1;
1982                 if(xw.fy < 0)
1983                         xw.fy = sh + xw.fy - xw.fh - 1;
1984
1985                 xw.h = xw.fh;
1986                 xw.w = xw.fw;
1987         } else {
1988                 /* window - default size */
1989                 xw.h = 2*BORDER + term.row * xw.ch;
1990                 xw.w = 2*BORDER + term.col * xw.cw;
1991                 xw.fx = 0;
1992                 xw.fy = 0;
1993         }
1994
1995         attrs.background_pixel = dc.col[DefaultBG];
1996         attrs.border_pixel = dc.col[DefaultBG];
1997         attrs.bit_gravity = NorthWestGravity;
1998         attrs.event_mask = FocusChangeMask | KeyPressMask
1999                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2000                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2001         attrs.colormap = xw.cmap;
2002
2003         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
2004         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2005                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2006                         XDefaultVisual(xw.dpy, xw.scr),
2007                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2008                         | CWColormap,
2009                         &attrs);
2010         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
2011
2012
2013         /* input methods */
2014         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
2015         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2016                                            | XIMStatusNothing, XNClientWindow, xw.win,
2017                                            XNFocusWindow, xw.win, NULL);
2018         /* gc */
2019         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
2020
2021         /* white cursor, black outline */
2022         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2023         XDefineCursor(xw.dpy, xw.win, cursor);
2024         XRecolorCursor(xw.dpy, cursor,
2025                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2026                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2027
2028         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2029
2030         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
2031         XMapWindow(xw.dpy, xw.win);
2032         xhints();
2033         XSync(xw.dpy, 0);
2034 }
2035
2036 void
2037 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2038         int fg = base.fg, bg = base.bg, temp;
2039         int winx = BORDER+x*xw.cw, winy = BORDER+y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
2040         XFontSet fontset = dc.font.set;
2041         int i;
2042
2043         /* only switch default fg/bg if term is in RV mode */
2044         if(IS_SET(MODE_REVERSE)) {
2045                 if(fg == DefaultFG)
2046                         fg = DefaultBG;
2047                 if(bg == DefaultBG)
2048                         bg = DefaultFG;
2049         }
2050
2051         if(base.mode & ATTR_REVERSE)
2052                 temp = fg, fg = bg, bg = temp;
2053
2054         if(base.mode & ATTR_BOLD) {
2055                 fg += 8;
2056                 fontset = dc.bfont.set;
2057         }
2058
2059         if(base.mode & ATTR_ITALIC)
2060                 fontset = dc.ifont.set;
2061
2062         XSetBackground(xw.dpy, dc.gc, dc.col[bg]);
2063         XSetForeground(xw.dpy, dc.gc, dc.col[fg]);
2064
2065         if(base.mode & ATTR_GFX) {
2066                 for(i = 0; i < bytelen; i++) {
2067                         char c = gfx[(uint)s[i] % 256];
2068                         if(c)
2069                                 s[i] = c;
2070                         else if(s[i] > 0x5f)
2071                                 s[i] -= 0x5f;
2072                 }
2073         }
2074
2075         XmbDrawImageString(xw.dpy, xw.buf, fontset, dc.gc, winx, winy, s, bytelen);
2076
2077         if(base.mode & ATTR_UNDERLINE)
2078                 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
2079 }
2080
2081 /* copy buffer pixmap to screen pixmap */
2082 void
2083 xcopy() {
2084         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2085         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2086 }
2087
2088 void
2089 xdrawcursor(void) {
2090         static int oldx = 0;
2091         static int oldy = 0;
2092         int sl;
2093         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
2094
2095         LIMIT(oldx, 0, term.col-1);
2096         LIMIT(oldy, 0, term.row-1);
2097
2098         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2099                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2100
2101         /* remove the old cursor */
2102         if(term.line[oldy][oldx].state & GLYPH_SET) {
2103                 sl = utf8size(term.line[oldy][oldx].c);
2104                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
2105         } else
2106                 xclear(oldx, oldy, oldx, oldy);
2107
2108         xcopy();
2109
2110         /* draw the new one */
2111         if(!(term.c.state & CURSOR_HIDE)) {
2112                 if(!(xw.state & WIN_FOCUSED))
2113                         g.bg = DefaultUCS;
2114
2115                 if(IS_SET(MODE_REVERSE))
2116                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
2117
2118                 sl = utf8size(g.c);
2119                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2120                 oldx = term.c.x, oldy = term.c.y;
2121         }
2122
2123         xcopy();
2124 }
2125
2126 void
2127 redraw(void) {
2128         struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
2129         tfulldirt();
2130         draw();
2131         nanosleep(&tv, NULL);
2132 }
2133
2134 void
2135 draw() {
2136         drawregion(0, 0, term.col, term.row);
2137         xcopy();
2138         gettimeofday(&xw.lastdraw, NULL);
2139 }
2140
2141 void
2142 drawregion(int x1, int y1, int x2, int y2) {
2143         int ic, ib, x, y, ox, sl;
2144         Glyph base, new;
2145         char buf[DRAW_BUF_SIZ];
2146         bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN);
2147
2148         if((sel.alt && !alt) || (!sel.alt && alt))
2149                 ena_sel = 0;
2150         if(!(xw.state & WIN_VISIBLE))
2151                 return;
2152
2153         for(y = y1; y < y2; y++) {
2154                 if(!term.dirty[y])
2155                         continue;
2156                 xclear(0, y, term.col, y);
2157                 term.dirty[y] = 0;
2158                 base = term.line[y][0];
2159                 ic = ib = ox = 0;
2160                 for(x = x1; x < x2; x++) {
2161                         new = term.line[y][x];
2162                         if(ena_sel && *(new.c) && selected(x, y))
2163                                 new.mode ^= ATTR_REVERSE;
2164                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
2165                                                   ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2166                                 xdraws(buf, base, ox, y, ic, ib);
2167                                 ic = ib = 0;
2168                         }
2169                         if(new.state & GLYPH_SET) {
2170                                 if(ib == 0) {
2171                                         ox = x;
2172                                         base = new;
2173                                 }
2174                                 sl = utf8size(new.c);
2175                                 memcpy(buf+ib, new.c, sl);
2176                                 ib += sl;
2177                                 ++ic;
2178                         }
2179                 }
2180                 if(ib > 0)
2181                         xdraws(buf, base, ox, y, ic, ib);
2182         }
2183         xdrawcursor();
2184 }
2185
2186 void
2187 expose(XEvent *ev) {
2188         XExposeEvent *e = &ev->xexpose;
2189         if(xw.state & WIN_REDRAW) {
2190                 if(!e->count)
2191                         xw.state &= ~WIN_REDRAW;
2192         }
2193         xcopy();
2194 }
2195
2196 void
2197 visibility(XEvent *ev) {
2198         XVisibilityEvent *e = &ev->xvisibility;
2199         if(e->state == VisibilityFullyObscured)
2200                 xw.state &= ~WIN_VISIBLE;
2201         else if(!(xw.state & WIN_VISIBLE))
2202                 /* need a full redraw for next Expose, not just a buf copy */
2203                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2204 }
2205
2206 void
2207 unmap(XEvent *ev) {
2208         xw.state &= ~WIN_VISIBLE;
2209 }
2210
2211 void
2212 xseturgency(int add) {
2213         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2214         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2215         XSetWMHints(xw.dpy, xw.win, h);
2216         XFree(h);
2217 }
2218
2219 void
2220 focus(XEvent *ev) {
2221         if(ev->type == FocusIn) {
2222                 xw.state |= WIN_FOCUSED;
2223                 xseturgency(0);
2224         } else
2225                 xw.state &= ~WIN_FOCUSED;
2226         draw();
2227 }
2228
2229 char*
2230 kmap(KeySym k, uint state) {
2231         int i;
2232         state &= ~Mod2Mask;
2233         for(i = 0; i < LEN(key); i++) {
2234                 uint mask = key[i].mask;
2235                 if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
2236                         return (char*)key[i].s;
2237         }
2238         return NULL;
2239 }
2240
2241 void
2242 kpress(XEvent *ev) {
2243         XKeyEvent *e = &ev->xkey;
2244         KeySym ksym;
2245         char buf[32];
2246         char *customkey;
2247         int len;
2248         int meta;
2249         int shift;
2250         Status status;
2251
2252         meta = e->state & Mod1Mask;
2253         shift = e->state & ShiftMask;
2254         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
2255
2256         /* 1. custom keys from config.h */
2257         if((customkey = kmap(ksym, e->state)))
2258                 ttywrite(customkey, strlen(customkey));
2259         /* 2. hardcoded (overrides X lookup) */
2260         else
2261                 switch(ksym) {
2262                 case XK_Up:
2263                 case XK_Down:
2264                 case XK_Left:
2265                 case XK_Right:
2266                         /* XXX: shift up/down doesn't work */
2267                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
2268                         ttywrite(buf, 3);
2269                         break;
2270                 case XK_Insert:
2271                         if(shift)
2272                                 selpaste();
2273                         break;
2274                 case XK_Return:
2275                         if(IS_SET(MODE_CRLF))
2276                                 ttywrite("\r\n", 2);
2277                         else
2278                                 ttywrite("\r", 1);
2279                         break;
2280                         /* 3. X lookup  */
2281                 default:
2282                         if(len > 0) {
2283                                 if(meta && len == 1)
2284                                         ttywrite("\033", 1);
2285                                 ttywrite(buf, len);
2286                         }
2287                         break;
2288                 }
2289 }
2290
2291 void
2292 cmessage(XEvent *e) {
2293         /* See xembed specs
2294            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2295         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2296                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2297                         xw.state |= WIN_FOCUSED;
2298                         xseturgency(0);
2299                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2300                         xw.state &= ~WIN_FOCUSED;
2301                 }
2302                 draw();
2303         }
2304 }
2305
2306 void
2307 resize(XEvent *e) {
2308         int col, row;
2309
2310         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
2311                 return;
2312
2313         xw.w = e->xconfigure.width;
2314         xw.h = e->xconfigure.height;
2315         col = (xw.w - 2*BORDER) / xw.cw;
2316         row = (xw.h - 2*BORDER) / xw.ch;
2317         if(col == term.col && row == term.row)
2318                 return;
2319         if(tresize(col, row))
2320                 draw();
2321         xresize(col, row);
2322         ttyresize(col, row);
2323 }
2324
2325 bool
2326 last_draw_too_old(void) {
2327         struct timeval now;
2328         gettimeofday(&now, NULL);
2329         return TIMEDIFF(now, xw.lastdraw) >= DRAW_TIMEOUT/1000;
2330 }
2331
2332 void
2333 run(void) {
2334         XEvent ev;
2335         fd_set rfd;
2336         int xfd = XConnectionNumber(xw.dpy);
2337         struct timeval timeout = {0};
2338         bool stuff_to_print = 0;
2339
2340         for(;;) {
2341                 FD_ZERO(&rfd);
2342                 FD_SET(cmdfd, &rfd);
2343                 FD_SET(xfd, &rfd);
2344                 timeout.tv_sec  = 0;
2345                 timeout.tv_usec = SELECT_TIMEOUT;
2346                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, &timeout) < 0) {
2347                         if(errno == EINTR)
2348                                 continue;
2349                         die("select failed: %s\n", SERRNO);
2350                 }
2351                 if(FD_ISSET(cmdfd, &rfd)) {
2352                         ttyread();
2353                         stuff_to_print = 1;
2354                 }
2355
2356                 if(stuff_to_print && last_draw_too_old()) {
2357                         stuff_to_print = 0;
2358                         draw();
2359                 }
2360
2361                 while(XPending(xw.dpy)) {
2362                         XNextEvent(xw.dpy, &ev);
2363                         if(XFilterEvent(&ev, xw.win))
2364                                 continue;
2365                         if(handler[ev.type])
2366                                 (handler[ev.type])(&ev);
2367                 }
2368         }
2369 }
2370
2371 int
2372 main(int argc, char *argv[]) {
2373         int i, bitm, xr, yr;
2374         unsigned int wr, hr;
2375
2376         xw.fw = xw.fh = xw.fx = xw.fy = 0;
2377         xw.isfixed = False;
2378
2379         for(i = 1; i < argc; i++) {
2380                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2381                 case 't':
2382                         if(++i < argc) opt_title = argv[i];
2383                         break;
2384                 case 'c':
2385                         if(++i < argc) opt_class = argv[i];
2386                         break;
2387                 case 'w':
2388                         if(++i < argc) opt_embed = argv[i];
2389                         break;
2390                 case 'f':
2391                         if(++i < argc) opt_io = argv[i];
2392                         break;
2393                 case 'e':
2394                         /* eat every remaining arguments */
2395                         if(++i < argc) opt_cmd = &argv[i];
2396                         goto run;
2397                 case 'g':
2398                         if(++i >= argc)
2399                                 break;
2400
2401                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
2402                         if(bitm & XValue)
2403                                 xw.fx = xr;
2404                         if(bitm & YValue)
2405                                 xw.fy = yr;
2406                         if(bitm & WidthValue)
2407                                 xw.fw = (int)wr;
2408                         if(bitm & HeightValue)
2409                                 xw.fh = (int)hr;
2410                         if(bitm & XNegative && xw.fx == 0)
2411                                 xw.fx = -1;
2412                         if(bitm & XNegative && xw.fy == 0)
2413                                 xw.fy = -1;
2414
2415                         if(xw.fh != 0 && xw.fw != 0)
2416                                 xw.isfixed = True;
2417                         break;
2418                 case 'v':
2419                 default:
2420                         die(USAGE);
2421                 }
2422         }
2423
2424  run:
2425         setlocale(LC_CTYPE, "");
2426         tnew(80, 24);
2427         ttynew();
2428         xinit();
2429         selinit();
2430         run();
2431         return 0;
2432 }
2433