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 REDRAW_TIMEOUT (80*1000) /* 80 ms */
  57
  58 #define SERRNO strerror(errno)
  59 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  60 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  61 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  62 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  63 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  64 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  65 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  66 #define IS_SET(flag) (term.mode & (flag))
  67 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  68 #define X2COL(x) (((x) - BORDER)/xw.cw)
  69 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  70
  71 enum glyph_attribute {
  72         ATTR_NULL      = 0,
  73         ATTR_REVERSE   = 1,
  74         ATTR_UNDERLINE = 2,
  75         ATTR_BOLD      = 4,
  76         ATTR_GFX       = 8,
  77         ATTR_ITALIC    = 16,
  78         ATTR_BLINK     = 32,
  79 };
  80
  81 enum cursor_movement {
  82         CURSOR_UP,
  83         CURSOR_DOWN,
  84         CURSOR_LEFT,
  85         CURSOR_RIGHT,
  86         CURSOR_SAVE,
  87         CURSOR_LOAD
  88 };
  89
  90 enum cursor_state {
  91         CURSOR_DEFAULT  = 0,
  92         CURSOR_HIDE     = 1,
  93         CURSOR_WRAPNEXT = 2
  94 };
  95
  96 enum glyph_state {
  97         GLYPH_SET   = 1,
  98         GLYPH_DIRTY = 2
  99 };
 100
 101 enum term_mode {
 102         MODE_WRAP       = 1,
 103         MODE_INSERT      = 2,
 104         MODE_APPKEYPAD   = 4,
 105         MODE_ALTSCREEN   = 8,
 106         MODE_CRLF       = 16,
 107         MODE_MOUSEBTN    = 32,
 108         MODE_MOUSEMOTION = 64,
 109         MODE_MOUSE       = 32|64,
 110         MODE_REVERSE     = 128
 111 };
 112
 113 enum escape_state {
 114         ESC_START      = 1,
 115         ESC_CSI = 2,
 116         ESC_STR = 4, /* DSC, OSC, PM, APC */
 117         ESC_ALTCHARSET = 8,
 118         ESC_STR_END    = 16, /* a final string was encountered */
 119 };
 120
 121 enum window_state {
 122         WIN_VISIBLE = 1,
 123         WIN_REDRAW  = 2,
 124         WIN_FOCUSED = 4
 125 };
 126
 127 /* bit macro */
 128 #undef B0
 129 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 130
 131 typedef unsigned char uchar;
 132 typedef unsigned int uint;
 133 typedef unsigned long ulong;
 134 typedef unsigned short ushort;
 135
 136 typedef struct {
 137         char c[UTF_SIZ];     /* character code */
 138         uchar mode;  /* attribute flags */
 139         ushort fg;   /* foreground  */
 140         ushort bg;   /* background  */
 141         uchar state; /* state flags    */
 142 } Glyph;
 143
 144 typedef Glyph* Line;
 145
 146 typedef struct {
 147         Glyph attr;      /* current char attributes */
 148         int x;
 149         int y;
 150         char state;
 151 } TCursor;
 152
 153 /* CSI Escape sequence structs */
 154 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 155 typedef struct {
 156         char buf[ESC_BUF_SIZ]; /* raw string */
 157         int len;               /* raw string length */
 158         char priv;
 159         int arg[ESC_ARG_SIZ];
 160         int narg;             /* nb of args */
 161         char mode;
 162 } CSIEscape;
 163
 164 /* STR Escape sequence structs */
 165 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 166 typedef struct {
 167         char type;           /* ESC type ... */
 168         char buf[STR_BUF_SIZ]; /* raw string */
 169         int len;               /* raw string length */
 170         char *args[STR_ARG_SIZ];
 171         int narg;             /* nb of args */
 172 } STREscape;
 173
 174 /* Internal representation of the screen */
 175 typedef struct {
 176         int row;        /* nb row */
 177         int col;        /* nb col */
 178         Line* line;     /* screen */
 179         Line* alt;      /* alternate screen */
 180         bool* dirty;    /* dirtyness of lines */
 181         TCursor c;      /* cursor */
 182         int top;        /* top    scroll limit */
 183         int bot;        /* bottom scroll limit */
 184         int mode;       /* terminal mode flags */
 185         int esc;        /* escape state flags */
 186         bool *tabs;
 187 } Term;
 188
 189 /* Purely graphic info */
 190 typedef struct {
 191         Display* dpy;
 192         Colormap cmap;
 193         Window win;
 194         XdbeBackBuffer buf;
 195         Atom xembed;
 196         XIM xim;
 197         XIC xic;
 198         int scr;
 199         Bool isfixed; /* is fixed geometry? */
 200         int fx, fy, fw, fh; /* fixed geometry */
 201         int w;  /* window width */
 202         int h;  /* window height */
 203         int ch; /* char height */
 204         int cw; /* char width  */
 205         char state; /* focus, redraw, visible */
 206 } XWindow;
 207
 208 typedef struct {
 209         KeySym k;
 210         uint mask;
 211         char s[ESC_BUF_SIZ];
 212 } Key;
 213
 214
 215 /* TODO: use better name for vars... */
 216 typedef struct {
 217         int mode;
 218         int bx, by;
 219         int ex, ey;
 220         struct {int x, y;} b, e;
 221         char *clip;
 222         Atom xtarget;
 223         bool alt;
 224         struct timeval tclick1;
 225         struct timeval tclick2;
 226 } Selection;
 227
 228 #include "config.h"
 229
 230 /* Drawing Context */
 231 typedef struct {
 232         ulong col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 233         GC gc;
 234         struct {
 235                 int ascent;
 236                 int descent;
 237                 short lbearing;
 238                 short rbearing;
 239                 XFontSet set;
 240         } font, bfont, ifont, ibfont;
 241 } DC;
 242
 243 static void die(const char*, ...);
 244 static void draw(void);
 245 static void redraw(void);
 246 static void drawregion(int, int, int, int);
 247 static void execsh(void);
 248 static void sigchld(int);
 249 static void run(void);
 250
 251 static void csidump(void);
 252 static void csihandle(void);
 253 static void csiparse(void);
 254 static void csireset(void);
 255 static void strdump(void);
 256 static void strhandle(void);
 257 static void strparse(void);
 258 static void strreset(void);
 259
 260 static void tclearregion(int, int, int, int);
 261 static void tcursor(int);
 262 static void tdeletechar(int);
 263 static void tdeleteline(int);
 264 static void tinsertblank(int);
 265 static void tinsertblankline(int);
 266 static void tmoveto(int, int);
 267 static void tnew(int, int);
 268 static void tnewline(int);
 269 static void tputtab(bool);
 270 static void tputc(char*);
 271 static void treset(void);
 272 static int tresize(int, int);
 273 static void tscrollup(int, int);
 274 static void tscrolldown(int, int);
 275 static void tsetattr(int*, int);
 276 static void tsetchar(char*);
 277 static void tsetscroll(int, int);
 278 static void tswapscreen(void);
 279 static void tsetdirt(int, int);
 280 static void tsetmode(bool, bool, int *, int);
 281 static void tfulldirt(void);
 282
 283 static void ttynew(void);
 284 static void ttyread(void);
 285 static void ttyresize(int, int);
 286 static void ttywrite(const char *, size_t);
 287
 288 static void xdraws(char *, Glyph, int, int, int, int);
 289 static void xhints(void);
 290 static void xclear(int, int, int, int);
 291 static void xdrawcursor(void);
 292 static void xinit(void);
 293 static void xloadcols(void);
 294 static void xresettitle(void);
 295 static void xseturgency(int);
 296 static void xsetsel(char*);
 297 static void xresize(int, int);
 298
 299 static void expose(XEvent *);
 300 static void visibility(XEvent *);
 301 static void unmap(XEvent *);
 302 static char* kmap(KeySym, uint);
 303 static void kpress(XEvent *);
 304 static void cmessage(XEvent *);
 305 static void resize(XEvent *);
 306 static void focus(XEvent *);
 307 static void brelease(XEvent *);
 308 static void bpress(XEvent *);
 309 static void bmotion(XEvent *);
 310 static void selnotify(XEvent *);
 311 static void selclear(XEvent *);
 312 static void selrequest(XEvent *);
 313
 314 static void selinit(void);
 315 static inline bool selected(int, int);
 316 static void selcopy(void);
 317 static void selpaste(void);
 318 static void selscroll(int, int);
 319
 320 static int utf8decode(char *, long *);
 321 static int utf8encode(long *, char *);
 322 static int utf8size(char *);
 323 static int isfullutf8(char *, int);
 324
 325 static void *xmalloc(size_t);
 326 static void *xrealloc(void *, size_t);
 327
 328 static void (*handler[LASTEvent])(XEvent *) = {
 329         [KeyPress] = kpress,
 330         [ClientMessage] = cmessage,
 331         [ConfigureNotify] = resize,
 332         [VisibilityNotify] = visibility,
 333         [UnmapNotify] = unmap,
 334         [Expose] = expose,
 335         [FocusIn] = focus,
 336         [FocusOut] = focus,
 337         [MotionNotify] = bmotion,
 338         [ButtonPress] = bpress,
 339         [ButtonRelease] = brelease,
 340         [SelectionClear] = selclear,
 341         [SelectionNotify] = selnotify,
 342         [SelectionRequest] = selrequest,
 343 };
 344
 345 /* Globals */
 346 static DC dc;
 347 static XWindow xw;
 348 static Term term;
 349 static CSIEscape csiescseq;
 350 static STREscape strescseq;
 351 static int cmdfd;
 352 static pid_t pid;
 353 static Selection sel;
 354 static int iofd = -1;
 355 static char **opt_cmd  = NULL;
 356 static char *opt_io    = NULL;
 357 static char *opt_title = NULL;
 358 static char *opt_embed = NULL;
 359 static char *opt_class = NULL;
 360
 361 void *
 362 xmalloc(size_t len) {
 363         void *p = malloc(len);
 364         if(!p)
 365                 die("Out of memory");
 366         return p;
 367 }
 368
 369 void *
 370 xrealloc(void *p, size_t len) {
 371         if((p = realloc(p, len)) == NULL)
 372                 die("Out of memory");
 373         return p;
 374 }
 375
 376 int
 377 utf8decode(char *s, long *u) {
 378         uchar c;
 379         int i, n, rtn;
 380
 381         rtn = 1;
 382         c = *s;
 383         if(~c & B7) { /* 0xxxxxxx */
 384                 *u = c;
 385                 return rtn;
 386         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 387                 *u = c&(B4|B3|B2|B1|B0);
 388                 n = 1;
 389         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 390                 *u = c&(B3|B2|B1|B0);
 391                 n = 2;
 392         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 393                 *u = c & (B2|B1|B0);
 394                 n = 3;
 395         } else
 396                 goto invalid;
 397         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 398                 c = *s;
 399                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 400                         goto invalid;
 401                 *u <<= 6;
 402                 *u |= c & (B5|B4|B3|B2|B1|B0);
 403         }
 404         if((n == 1 && *u < 0x80) ||
 405            (n == 2 && *u < 0x800) ||
 406            (n == 3 && *u < 0x10000) ||
 407            (*u >= 0xD800 && *u <= 0xDFFF))
 408                 goto invalid;
 409         return rtn;
 410 invalid:
 411         *u = 0xFFFD;
 412         return rtn;
 413 }
 414
 415 int
 416 utf8encode(long *u, char *s) {
 417         uchar *sp;
 418         ulong uc;
 419         int i, n;
 420
 421         sp = (uchar*) s;
 422         uc = *u;
 423         if(uc < 0x80) {
 424                 *sp = uc; /* 0xxxxxxx */
 425                 return 1;
 426         } else if(*u < 0x800) {
 427                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 428                 n = 1;
 429         } else if(uc < 0x10000) {
 430                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 431                 n = 2;
 432         } else if(uc <= 0x10FFFF) {
 433                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 434                 n = 3;
 435         } else {
 436                 goto invalid;
 437         }
 438         for(i=n,++sp; i>0; --i,++sp)
 439                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 440         return n+1;
 441 invalid:
 442         /* U+FFFD */
 443         *s++ = '\xEF';
 444         *s++ = '\xBF';
 445         *s = '\xBD';
 446         return 3;
 447 }
 448
 449 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 450    UTF-8 otherwise return 0 */
 451 int
 452 isfullutf8(char *s, int b) {
 453         uchar *c1, *c2, *c3;
 454
 455         c1 = (uchar *) s;
 456         c2 = (uchar *) ++s;
 457         c3 = (uchar *) ++s;
 458         if(b < 1)
 459                 return 0;
 460         else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
 461                 return 0;
 462         else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 463             ((b == 1) ||
 464             ((b == 2) && (*c2&(B7|B6)) == B7)))
 465                 return 0;
 466         else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 467             ((b == 1) ||
 468             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 469             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
 470                 return 0;
 471         else
 472                 return 1;
 473 }
 474
 475 int
 476 utf8size(char *s) {
 477         uchar c = *s;
 478
 479         if(~c&B7)
 480                 return 1;
 481         else if((c&(B7|B6|B5)) == (B7|B6))
 482                 return 2;
 483         else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 484                 return 3;
 485         else
 486                 return 4;
 487 }
 488
 489 void
 490 selinit(void) {
 491         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 492         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 493         sel.mode = 0;
 494         sel.bx = -1;
 495         sel.clip = NULL;
 496         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 497         if(sel.xtarget == None)
 498                 sel.xtarget = XA_STRING;
 499 }
 500
 501 static inline bool
 502 selected(int x, int y) {
 503         if(sel.ey == y && sel.by == y) {
 504                 int bx = MIN(sel.bx, sel.ex);
 505                 int ex = MAX(sel.bx, sel.ex);
 506                 return BETWEEN(x, bx, ex);
 507         }
 508         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 509                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 510 }
 511
 512 void
 513 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 514         if(b)
 515                 *b = e->xbutton.button;
 516
 517         *x = X2COL(e->xbutton.x);
 518         *y = Y2ROW(e->xbutton.y);
 519         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 520         sel.b.y = MIN(sel.by, sel.ey);
 521         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 522         sel.e.y = MAX(sel.by, sel.ey);
 523 }
 524
 525 void
 526 mousereport(XEvent *e) {
 527         int x = X2COL(e->xbutton.x);
 528         int y = Y2ROW(e->xbutton.y);
 529         int button = e->xbutton.button;
 530         int state = e->xbutton.state;
 531         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 532         static int ob, ox, oy;
 533
 534         /* from urxvt */
 535         if(e->xbutton.type == MotionNotify) {
 536                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 537                         return;
 538                 button = ob + 32;
 539                 ox = x, oy = y;
 540         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 541                 button = 3;
 542         } else {
 543                 button -= Button1;
 544                 if(button >= 3)
 545                         button += 64 - 3;
 546                 if(e->xbutton.type == ButtonPress) {
 547                         ob = button;
 548                         ox = x, oy = y;
 549                 }
 550         }
 551
 552         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 553                 + (state & Mod4Mask    ? 8  : 0)
 554                 + (state & ControlMask ? 16 : 0);
 555
 556         ttywrite(buf, sizeof(buf));
 557 }
 558
 559 void
 560 bpress(XEvent *e) {
 561         if(IS_SET(MODE_MOUSE))
 562                 mousereport(e);
 563         else if(e->xbutton.button == Button1) {
 564                 if(sel.bx != -1)
 565                         tsetdirt(sel.b.y, sel.e.y);
 566                 sel.mode = 1;
 567                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 568                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 569         }
 570 }
 571
 572 void
 573 selcopy(void) {
 574         char *str, *ptr;
 575         int x, y, bufsize, is_selected = 0;
 576
 577         if(sel.bx == -1)
 578                 str = NULL;
 579
 580         else {
 581                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 582                 ptr = str = xmalloc(bufsize);
 583
 584                 /* append every set & selected glyph to the selection */
 585                 for(y = 0; y < term.row; y++) {
 586                         for(x = 0; x < term.col; x++) {
 587                                 is_selected = selected(x, y);
 588                                 if((term.line[y][x].state & GLYPH_SET) && is_selected) {
 589                                         int size = utf8size(term.line[y][x].c);
 590                                         memcpy(ptr, term.line[y][x].c, size);
 591                                         ptr += size;
 592                                 }
 593                         }
 594
 595                         /* \n at the end of every selected line except for the last one */
 596                         if(is_selected && y < sel.e.y)
 597                                 *ptr++ = '\n';
 598                 }
 599                 *ptr = 0;
 600         }
 601         sel.alt = IS_SET(MODE_ALTSCREEN);
 602         xsetsel(str);
 603 }
 604
 605 void
 606 selnotify(XEvent *e) {
 607         ulong nitems, ofs, rem;
 608         int format;
 609         uchar *data;
 610         Atom type;
 611
 612         ofs = 0;
 613         do {
 614                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 615                                         False, AnyPropertyType, &type, &format,
 616                                         &nitems, &rem, &data)) {
 617                         fprintf(stderr, "Clipboard allocation failed\n");
 618                         return;
 619                 }
 620                 ttywrite((const char *) data, nitems * format / 8);
 621                 XFree(data);
 622                 /* number of 32-bit chunks returned */
 623                 ofs += nitems * format / 32;
 624         } while(rem > 0);
 625 }
 626
 627 void
 628 selpaste() {
 629         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
 630 }
 631
 632 void selclear(XEvent *e) {
 633         if(sel.bx == -1)
 634                 return;
 635         sel.bx = -1;
 636         tsetdirt(sel.b.y, sel.e.y);
 637 }
 638
 639 void
 640 selrequest(XEvent *e) {
 641         XSelectionRequestEvent *xsre;
 642         XSelectionEvent xev;
 643         Atom xa_targets;
 644
 645         xsre = (XSelectionRequestEvent *) e;
 646         xev.type = SelectionNotify;
 647         xev.requestor = xsre->requestor;
 648         xev.selection = xsre->selection;
 649         xev.target = xsre->target;
 650         xev.time = xsre->time;
 651         /* reject */
 652         xev.property = None;
 653
 654         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 655         if(xsre->target == xa_targets) {
 656                 /* respond with the supported type */
 657                 Atom string = sel.xtarget;
 658                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 659                                 XA_ATOM, 32, PropModeReplace,
 660                                 (uchar *) &string, 1);
 661                 xev.property = xsre->property;
 662         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 663                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 664                                 xsre->target, 8, PropModeReplace,
 665                                 (uchar *) sel.clip, strlen(sel.clip));
 666                 xev.property = xsre->property;
 667         }
 668
 669         /* all done, send a notification to the listener */
 670         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 671                 fprintf(stderr, "Error sending SelectionNotify event\n");
 672 }
 673
 674 void
 675 xsetsel(char *str) {
 676         /* register the selection for both the clipboard and the primary */
 677         Atom clipboard;
 678
 679         free(sel.clip);
 680         sel.clip = str;
 681
 682         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 683
 684         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 685         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 686 }
 687
 688 void
 689 brelease(XEvent *e) {
 690         if(IS_SET(MODE_MOUSE)) {
 691                 mousereport(e);
 692                 return;
 693         }
 694         if(e->xbutton.button == Button2)
 695                 selpaste();
 696         else if(e->xbutton.button == Button1) {
 697                 sel.mode = 0;
 698                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 699                 term.dirty[sel.ey] = 1;
 700                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 701                         struct timeval now;
 702                         sel.bx = -1;
 703                         gettimeofday(&now, NULL);
 704
 705                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 706                                 /* triple click on the line */
 707                                 sel.b.x = sel.bx = 0;
 708                                 sel.e.x = sel.ex = term.col;
 709                                 sel.b.y = sel.e.y = sel.ey;
 710                                 selcopy();
 711                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 712                                 /* double click to select word */
 713                                 sel.bx = sel.ex;
 714                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 715                                           term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
 716                                 sel.b.x = sel.bx;
 717                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 718                                           term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
 719                                 sel.e.x = sel.ex;
 720                                 sel.b.y = sel.e.y = sel.ey;
 721                                 selcopy();
 722                         }
 723                 } else
 724                         selcopy();
 725         }
 726         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 727         gettimeofday(&sel.tclick1, NULL);
 728 }
 729
 730 void
 731 bmotion(XEvent *e) {
 732         if(IS_SET(MODE_MOUSE)) {
 733                 mousereport(e);
 734                 return;
 735         }
 736         if(sel.mode) {
 737                 int oldey = sel.ey, oldex = sel.ex;
 738                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 739
 740                 if(oldey != sel.ey || oldex != sel.ex) {
 741                         int starty = MIN(oldey, sel.ey);
 742                         int endy = MAX(oldey, sel.ey);
 743                         tsetdirt(starty, endy);
 744                 }
 745         }
 746 }
 747
 748 void
 749 die(const char *errstr, ...) {
 750         va_list ap;
 751
 752         va_start(ap, errstr);
 753         vfprintf(stderr, errstr, ap);
 754         va_end(ap);
 755         exit(EXIT_FAILURE);
 756 }
 757
 758 void
 759 execsh(void) {
 760         char **args;
 761         char *envshell = getenv("SHELL");
 762
 763         unsetenv("COLUMNS");
 764         unsetenv("LINES");
 765         unsetenv("TERMCAP");
 766
 767         signal(SIGCHLD, SIG_DFL);
 768         signal(SIGHUP, SIG_DFL);
 769         signal(SIGINT, SIG_DFL);
 770         signal(SIGQUIT, SIG_DFL);
 771         signal(SIGTERM, SIG_DFL);
 772         signal(SIGALRM, SIG_DFL);
 773
 774         DEFAULT(envshell, SHELL);
 775         putenv("TERM="TNAME);
 776         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 777         execvp(args[0], args);
 778         exit(EXIT_FAILURE);
 779 }
 780
 781 void
 782 sigchld(int a) {
 783         int stat = 0;
 784         if(waitpid(pid, &stat, 0) < 0)
 785                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 786         if(WIFEXITED(stat))
 787                 exit(WEXITSTATUS(stat));
 788         else
 789                 exit(EXIT_FAILURE);
 790 }
 791
 792 void
 793 ttynew(void) {
 794         int m, s;
 795
 796         /* seems to work fine on linux, openbsd and freebsd */
 797         struct winsize w = {term.row, term.col, 0, 0};
 798         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 799                 die("openpty failed: %s\n", SERRNO);
 800
 801         switch(pid = fork()) {
 802         case -1:
 803                 die("fork failed\n");
 804                 break;
 805         case 0:
 806                 setsid(); /* create a new process group */
 807                 dup2(s, STDIN_FILENO);
 808                 dup2(s, STDOUT_FILENO);
 809                 dup2(s, STDERR_FILENO);
 810                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 811                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 812                 close(s);
 813                 close(m);
 814                 execsh();
 815                 break;
 816         default:
 817                 close(s);
 818                 cmdfd = m;
 819                 signal(SIGCHLD, sigchld);
 820                 if(opt_io) {
 821                         if(!strcmp(opt_io, "-")) {
 822                                 iofd = STDOUT_FILENO;
 823                         } else {
 824                                 if((iofd = open(opt_io, O_WRONLY | O_CREAT, 0666)) < 0) {
 825                                         fprintf(stderr, "Error opening %s:%s\n",
 826                                                 opt_io, strerror(errno));
 827                                 }
 828                         }
 829                 }
 830         }
 831 }
 832
 833 void
 834 dump(char c) {
 835         static int col;
 836         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 837         if(++col % 10 == 0)
 838                 fprintf(stderr, "\n");
 839 }
 840
 841 void
 842 ttyread(void) {
 843         static char buf[BUFSIZ];
 844         static int buflen = 0;
 845         char *ptr;
 846         char s[UTF_SIZ];
 847         int charsize; /* size of utf8 char in bytes */
 848         long utf8c;
 849         int ret;
 850
 851         /* append read bytes to unprocessed bytes */
 852         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 853                 die("Couldn't read from shell: %s\n", SERRNO);
 854
 855         /* process every complete utf8 char */
 856         buflen += ret;
 857         ptr = buf;
 858         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 859                 charsize = utf8decode(ptr, &utf8c);
 860                 utf8encode(&utf8c, s);
 861                 tputc(s);
 862                 ptr    += charsize;
 863                 buflen -= charsize;
 864         }
 865
 866         /* keep any uncomplete utf8 char for the next call */
 867         memmove(buf, ptr, buflen);
 868 }
 869
 870 void
 871 ttywrite(const char *s, size_t n) {
 872         if(write(cmdfd, s, n) == -1)
 873                 die("write error on tty: %s\n", SERRNO);
 874 }
 875
 876 void
 877 ttyresize(int x, int y) {
 878         struct winsize w;
 879
 880         w.ws_row = term.row;
 881         w.ws_col = term.col;
 882         w.ws_xpixel = xw.w;
 883         w.ws_ypixel = xw.h;
 884         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 885                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 886 }
 887
 888 void
 889 tsetdirt(int top, int bot)
 890 {
 891         int i;
 892
 893         LIMIT(top, 0, term.row-1);
 894         LIMIT(bot, 0, term.row-1);
 895
 896         for(i = top; i <= bot; i++)
 897                 term.dirty[i] = 1;
 898 }
 899
 900 void
 901 tfulldirt(void)
 902 {
 903         tsetdirt(0, term.row-1);
 904 }
 905
 906 void
 907 tcursor(int mode) {
 908         static TCursor c;
 909
 910         if(mode == CURSOR_SAVE)
 911                 c = term.c;
 912         else if(mode == CURSOR_LOAD)
 913                 term.c = c, tmoveto(c.x, c.y);
 914 }
 915
 916 void
 917 treset(void) {
 918         unsigned i;
 919         term.c = (TCursor){{
 920                 .mode = ATTR_NULL,
 921                 .fg = DefaultFG,
 922                 .bg = DefaultBG
 923         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 924
 925         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 926         for(i = TAB; i < term.col; i += TAB)
 927                 term.tabs[i] = 1;
 928         term.top = 0, term.bot = term.row - 1;
 929         term.mode = MODE_WRAP;
 930         tclearregion(0, 0, term.col-1, term.row-1);
 931 }
 932
 933 void
 934 tnew(int col, int row) {
 935         /* set screen size */
 936         term.row = row, term.col = col;
 937         term.line = xmalloc(term.row * sizeof(Line));
 938         term.alt  = xmalloc(term.row * sizeof(Line));
 939         term.dirty = xmalloc(term.row * sizeof(*term.dirty));
 940         term.tabs = xmalloc(term.col * sizeof(*term.tabs));
 941
 942         for(row = 0; row < term.row; row++) {
 943                 term.line[row] = xmalloc(term.col * sizeof(Glyph));
 944                 term.alt [row] = xmalloc(term.col * sizeof(Glyph));
 945                 term.dirty[row] = 0;
 946         }
 947         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 948         /* setup screen */
 949         treset();
 950 }
 951
 952 void
 953 tswapscreen(void) {
 954         Line* tmp = term.line;
 955         term.line = term.alt;
 956         term.alt = tmp;
 957         term.mode ^= MODE_ALTSCREEN;
 958         tfulldirt();
 959 }
 960
 961 void
 962 tscrolldown(int orig, int n) {
 963         int i;
 964         Line temp;
 965
 966         LIMIT(n, 0, term.bot-orig+1);
 967
 968         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 969
 970         for(i = term.bot; i >= orig+n; i--) {
 971                 temp = term.line[i];
 972                 term.line[i] = term.line[i-n];
 973                 term.line[i-n] = temp;
 974
 975                 term.dirty[i] = 1;
 976                 term.dirty[i-n] = 1;
 977         }
 978
 979         selscroll(orig, n);
 980 }
 981
 982 void
 983 tscrollup(int orig, int n) {
 984         int i;
 985         Line temp;
 986         LIMIT(n, 0, term.bot-orig+1);
 987
 988         tclearregion(0, orig, term.col-1, orig+n-1);
 989
 990         for(i = orig; i <= term.bot-n; i++) {
 991                  temp = term.line[i];
 992                  term.line[i] = term.line[i+n];
 993                  term.line[i+n] = temp;
 994
 995                  term.dirty[i] = 1;
 996                  term.dirty[i+n] = 1;
 997         }
 998
 999         selscroll(orig, -n);
1000 }
1001
1002 void
1003 selscroll(int orig, int n) {
1004         if(sel.bx == -1)
1005                 return;
1006
1007         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1008                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1009                         sel.bx = -1;
1010                         return;
1011                 }
1012                 if(sel.by < term.top) {
1013                         sel.by = term.top;
1014                         sel.bx = 0;
1015                 }
1016                 if(sel.ey > term.bot) {
1017                         sel.ey = term.bot;
1018                         sel.ex = term.col;
1019                 }
1020                 sel.b.y = sel.by, sel.b.x = sel.bx;
1021                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1022         }
1023 }
1024
1025 void
1026 tnewline(int first_col) {
1027         int y = term.c.y;
1028         if(y == term.bot)
1029                 tscrollup(term.top, 1);
1030         else
1031                 y++;
1032         tmoveto(first_col ? 0 : term.c.x, y);
1033 }
1034
1035 void
1036 csiparse(void) {
1037         /* int noarg = 1; */
1038         char *p = csiescseq.buf;
1039
1040         csiescseq.narg = 0;
1041         if(*p == '?')
1042                 csiescseq.priv = 1, p++;
1043
1044         while(p < csiescseq.buf+csiescseq.len) {
1045                 while(isdigit(*p)) {
1046                         csiescseq.arg[csiescseq.narg] *= 10;
1047                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1048                 }
1049                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ)
1050                         csiescseq.narg++, p++;
1051                 else {
1052                         csiescseq.mode = *p;
1053                         csiescseq.narg++;
1054                         return;
1055                 }
1056         }
1057 }
1058
1059 void
1060 tmoveto(int x, int y) {
1061         LIMIT(x, 0, term.col-1);
1062         LIMIT(y, 0, term.row-1);
1063         term.c.state &= ~CURSOR_WRAPNEXT;
1064         term.c.x = x;
1065         term.c.y = y;
1066 }
1067
1068 void
1069 tsetchar(char *c) {
1070         term.dirty[term.c.y] = 1;
1071         term.line[term.c.y][term.c.x] = term.c.attr;
1072         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
1073         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
1074 }
1075
1076 void
1077 tclearregion(int x1, int y1, int x2, int y2) {
1078         int x, y, temp;
1079
1080         if(x1 > x2)
1081                 temp = x1, x1 = x2, x2 = temp;
1082         if(y1 > y2)
1083                 temp = y1, y1 = y2, y2 = temp;
1084
1085         LIMIT(x1, 0, term.col-1);
1086         LIMIT(x2, 0, term.col-1);
1087         LIMIT(y1, 0, term.row-1);
1088         LIMIT(y2, 0, term.row-1);
1089
1090         for(y = y1; y <= y2; y++) {
1091                 term.dirty[y] = 1;
1092                 for(x = x1; x <= x2; x++)
1093                         term.line[y][x].state = 0;
1094         }
1095 }
1096
1097 void
1098 tdeletechar(int n) {
1099         int src = term.c.x + n;
1100         int dst = term.c.x;
1101         int size = term.col - src;
1102
1103         term.dirty[term.c.y] = 1;
1104
1105         if(src >= term.col) {
1106                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1107                 return;
1108         }
1109         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1110         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1111 }
1112
1113 void
1114 tinsertblank(int n) {
1115         int src = term.c.x;
1116         int dst = src + n;
1117         int size = term.col - dst;
1118
1119         term.dirty[term.c.y] = 1;
1120
1121         if(dst >= term.col) {
1122                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1123                 return;
1124         }
1125         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1126         tclearregion(src, term.c.y, dst - 1, term.c.y);
1127 }
1128
1129 void
1130 tinsertblankline(int n) {
1131         if(term.c.y < term.top || term.c.y > term.bot)
1132                 return;
1133
1134         tscrolldown(term.c.y, n);
1135 }
1136
1137 void
1138 tdeleteline(int n) {
1139         if(term.c.y < term.top || term.c.y > term.bot)
1140                 return;
1141
1142         tscrollup(term.c.y, n);
1143 }
1144
1145 void
1146 tsetattr(int *attr, int l) {
1147         int i;
1148
1149         for(i = 0; i < l; i++) {
1150                 switch(attr[i]) {
1151                 case 0:
1152                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
1153                                         | ATTR_ITALIC | ATTR_BLINK);
1154                         term.c.attr.fg = DefaultFG;
1155                         term.c.attr.bg = DefaultBG;
1156                         break;
1157                 case 1:
1158                         term.c.attr.mode |= ATTR_BOLD;
1159                         break;
1160                 case 3: /* enter standout (highlight) */
1161                         term.c.attr.mode |= ATTR_ITALIC;
1162                         break;
1163                 case 4:
1164                         term.c.attr.mode |= ATTR_UNDERLINE;
1165                         break;
1166                 case 5:
1167                         term.c.attr.mode |= ATTR_BLINK;
1168                         break;
1169                 case 7:
1170                         term.c.attr.mode |= ATTR_REVERSE;
1171                         break;
1172                 case 21:
1173                 case 22:
1174                         term.c.attr.mode &= ~ATTR_BOLD;
1175                         break;
1176                 case 23: /* leave standout (highlight) mode */
1177                         term.c.attr.mode &= ~ATTR_ITALIC;
1178                         break;
1179                 case 24:
1180                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1181                         break;
1182                 case 25:
1183                         term.c.attr.mode &= ~ATTR_BLINK;
1184                         break;
1185                 case 27:
1186                         term.c.attr.mode &= ~ATTR_REVERSE;
1187                         break;
1188                 case 38:
1189                         if(i + 2 < l && attr[i + 1] == 5) {
1190                                 i += 2;
1191                                 if(BETWEEN(attr[i], 0, 255))
1192                                         term.c.attr.fg = attr[i];
1193                                 else
1194                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
1195                         }
1196                         else
1197                                 fprintf(stderr, "erresc(38): gfx attr %d unknown\n", attr[i]);
1198                         break;
1199                 case 39:
1200                         term.c.attr.fg = DefaultFG;
1201                         break;
1202                 case 48:
1203                         if(i + 2 < l && attr[i + 1] == 5) {
1204                                 i += 2;
1205                                 if(BETWEEN(attr[i], 0, 255))
1206                                         term.c.attr.bg = attr[i];
1207                                 else
1208                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
1209                         }
1210                         else
1211                                 fprintf(stderr, "erresc(48): gfx attr %d unknown\n", attr[i]);
1212                         break;
1213                 case 49:
1214                         term.c.attr.bg = DefaultBG;
1215                         break;
1216                 default:
1217                         if(BETWEEN(attr[i], 30, 37))
1218                                 term.c.attr.fg = attr[i] - 30;
1219                         else if(BETWEEN(attr[i], 40, 47))
1220                                 term.c.attr.bg = attr[i] - 40;
1221                         else if(BETWEEN(attr[i], 90, 97))
1222                                 term.c.attr.fg = attr[i] - 90 + 8;
1223                         else if(BETWEEN(attr[i], 100, 107))
1224                                 term.c.attr.bg = attr[i] - 100 + 8;
1225                         else
1226                                 fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]), csidump();
1227                         break;
1228                 }
1229         }
1230 }
1231
1232 void
1233 tsetscroll(int t, int b) {
1234         int temp;
1235
1236         LIMIT(t, 0, term.row-1);
1237         LIMIT(b, 0, term.row-1);
1238         if(t > b) {
1239                 temp = t;
1240                 t = b;
1241                 b = temp;
1242         }
1243         term.top = t;
1244         term.bot = b;
1245 }
1246
1247 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1248
1249 void
1250 tsetmode(bool priv, bool set, int *args, int narg) {
1251         int *lim, mode;
1252
1253         for(lim = args + narg; args < lim; ++args) {
1254                 if(priv) {
1255                         switch(*args) {
1256                         case 1:
1257                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1258                                 break;
1259                         case 5: /* DECSCNM -- Reverve video */
1260                                 mode = term.mode;
1261                                 MODBIT(term.mode,set, MODE_REVERSE);
1262                                 if(mode != term.mode)
1263                                         redraw();
1264                                 break;
1265                         case 7:
1266                                 MODBIT(term.mode, set, MODE_WRAP);
1267                                 break;
1268                         case 20:
1269                                 MODBIT(term.mode, set, MODE_CRLF);
1270                                 break;
1271                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1272                                 break;
1273                         case 25:
1274                                 MODBIT(term.c.state, !set, CURSOR_HIDE);
1275                                 break;
1276                         case 1000: /* 1000,1002: enable xterm mouse report */
1277                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1278                                 break;
1279                         case 1002:
1280                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1281                                 break;
1282                         case 1049: /* = 1047 and 1048 */
1283                         case 47:
1284                         case 1047:
1285                                 if(IS_SET(MODE_ALTSCREEN))
1286                                         tclearregion(0, 0, term.col-1, term.row-1);
1287                                 if((set && !IS_SET(MODE_ALTSCREEN)) ||
1288                                     (!set && IS_SET(MODE_ALTSCREEN))) {
1289                                             tswapscreen();
1290                                 }
1291                                 if(*args != 1049)
1292                                         break;
1293                                 /* pass through */
1294                         case 1048:
1295                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1296                                 break;
1297                         default:
1298                                 fprintf(stderr,
1299                                         "erresc: unknown private set/reset mode %d\n",
1300                                         *args);
1301                                 break;
1302                         }
1303                 } else {
1304                         switch(*args) {
1305                         case 4:
1306                                 MODBIT(term.mode, set, MODE_INSERT);
1307                                 break;
1308                         default:
1309                                 fprintf(stderr,
1310                                         "erresc: unknown set/reset mode %d\n",
1311                                         *args);
1312                                 break;
1313                         }
1314                 }
1315         }
1316 }
1317 #undef MODBIT
1318
1319
1320 void
1321 csihandle(void) {
1322         switch(csiescseq.mode) {
1323         default:
1324         unknown:
1325                 fprintf(stderr, "erresc: unknown csi ");
1326                 csidump();
1327                 /* die(""); */
1328                 break;
1329         case '@': /* ICH -- Insert <n> blank char */
1330                 DEFAULT(csiescseq.arg[0], 1);
1331                 tinsertblank(csiescseq.arg[0]);
1332                 break;
1333         case 'A': /* CUU -- Cursor <n> Up */
1334         case 'e':
1335                 DEFAULT(csiescseq.arg[0], 1);
1336                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1337                 break;
1338         case 'B': /* CUD -- Cursor <n> Down */
1339                 DEFAULT(csiescseq.arg[0], 1);
1340                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1341                 break;
1342         case 'C': /* CUF -- Cursor <n> Forward */
1343         case 'a':
1344                 DEFAULT(csiescseq.arg[0], 1);
1345                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1346                 break;
1347         case 'D': /* CUB -- Cursor <n> Backward */
1348                 DEFAULT(csiescseq.arg[0], 1);
1349                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1350                 break;
1351         case 'E': /* CNL -- Cursor <n> Down and first col */
1352                 DEFAULT(csiescseq.arg[0], 1);
1353                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1354                 break;
1355         case 'F': /* CPL -- Cursor <n> Up and first col */
1356                 DEFAULT(csiescseq.arg[0], 1);
1357                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1358                 break;
1359         case 'g': /* TBC -- Tabulation clear */
1360                 switch (csiescseq.arg[0]) {
1361                 case 0: /* clear current tab stop */
1362                         term.tabs[term.c.x] = 0;
1363                         break;
1364                 case 3: /* clear all the tabs */
1365                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1366                         break;
1367                 default:
1368                         goto unknown;
1369                 }
1370                 break;
1371         case 'G': /* CHA -- Move to <col> */
1372         case '`': /* HPA */
1373                 DEFAULT(csiescseq.arg[0], 1);
1374                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1375                 break;
1376         case 'H': /* CUP -- Move to <row> <col> */
1377         case 'f': /* HVP */
1378                 DEFAULT(csiescseq.arg[0], 1);
1379                 DEFAULT(csiescseq.arg[1], 1);
1380                 tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1381                 break;
1382         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1383                 DEFAULT(csiescseq.arg[0], 1);
1384                 while(csiescseq.arg[0]--)
1385                         tputtab(1);
1386                 break;
1387         case 'J': /* ED -- Clear screen */
1388                 sel.bx = -1;
1389                 switch(csiescseq.arg[0]) {
1390                 case 0: /* below */
1391                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1392                         if(term.c.y < term.row-1)
1393                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1394                         break;
1395                 case 1: /* above */
1396                         if(term.c.y > 1)
1397                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1398                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1399                         break;
1400                 case 2: /* all */
1401                         tclearregion(0, 0, term.col-1, term.row-1);
1402                         break;
1403                 default:
1404                         goto unknown;
1405                 }
1406                 break;
1407         case 'K': /* EL -- Clear line */
1408                 switch(csiescseq.arg[0]) {
1409                 case 0: /* right */
1410                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1411                         break;
1412                 case 1: /* left */
1413                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1414                         break;
1415                 case 2: /* all */
1416                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1417                         break;
1418                 }
1419                 break;
1420         case 'S': /* SU -- Scroll <n> line up */
1421                 DEFAULT(csiescseq.arg[0], 1);
1422                 tscrollup(term.top, csiescseq.arg[0]);
1423                 break;
1424         case 'T': /* SD -- Scroll <n> line down */
1425                 DEFAULT(csiescseq.arg[0], 1);
1426                 tscrolldown(term.top, csiescseq.arg[0]);
1427                 break;
1428         case 'L': /* IL -- Insert <n> blank lines */
1429                 DEFAULT(csiescseq.arg[0], 1);
1430                 tinsertblankline(csiescseq.arg[0]);
1431                 break;
1432         case 'l': /* RM -- Reset Mode */
1433                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1434                 break;
1435         case 'M': /* DL -- Delete <n> lines */
1436                 DEFAULT(csiescseq.arg[0], 1);
1437                 tdeleteline(csiescseq.arg[0]);
1438                 break;
1439         case 'X': /* ECH -- Erase <n> char */
1440                 DEFAULT(csiescseq.arg[0], 1);
1441                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1442                 break;
1443         case 'P': /* DCH -- Delete <n> char */
1444                 DEFAULT(csiescseq.arg[0], 1);
1445                 tdeletechar(csiescseq.arg[0]);
1446                 break;
1447         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1448                 DEFAULT(csiescseq.arg[0], 1);
1449                 while(csiescseq.arg[0]--)
1450                         tputtab(0);
1451                 break;
1452         case 'd': /* VPA -- Move to <row> */
1453                 DEFAULT(csiescseq.arg[0], 1);
1454                 tmoveto(term.c.x, csiescseq.arg[0]-1);
1455                 break;
1456         case 'h': /* SM -- Set terminal mode */
1457                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1458                 break;
1459         case 'm': /* SGR -- Terminal attribute (color) */
1460                 tsetattr(csiescseq.arg, csiescseq.narg);
1461                 break;
1462         case 'r': /* DECSTBM -- Set Scrolling Region */
1463                 if(csiescseq.priv)
1464                         goto unknown;
1465                 else {
1466                         DEFAULT(csiescseq.arg[0], 1);
1467                         DEFAULT(csiescseq.arg[1], term.row);
1468                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1469                         tmoveto(0, 0);
1470                 }
1471                 break;
1472         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1473                 tcursor(CURSOR_SAVE);
1474                 break;
1475         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1476                 tcursor(CURSOR_LOAD);
1477                 break;
1478         }
1479 }
1480
1481 void
1482 csidump(void) {
1483         int i;
1484         printf("ESC[");
1485         for(i = 0; i < csiescseq.len; i++) {
1486                 uint c = csiescseq.buf[i] & 0xff;
1487                 if(isprint(c)) putchar(c);
1488                 else if(c == '\n') printf("(\\n)");
1489                 else if(c == '\r') printf("(\\r)");
1490                 else if(c == 0x1b) printf("(\\e)");
1491                 else printf("(%02x)", c);
1492         }
1493         putchar('\n');
1494 }
1495
1496 void
1497 csireset(void) {
1498         memset(&csiescseq, 0, sizeof(csiescseq));
1499 }
1500
1501 void
1502 strhandle(void) {
1503         char *p;
1504
1505         /*
1506          * TODO: make this being useful in case of color palette change.
1507          */
1508         strparse();
1509
1510         p = strescseq.buf;
1511
1512         switch(strescseq.type) {
1513         case ']': /* OSC -- Operating System Command */
1514                 switch(p[0]) {
1515                 case '0':
1516                 case '1':
1517                 case '2':
1518                         /*
1519                          * TODO: Handle special chars in string, like umlauts.
1520                          */
1521                         if(p[1] == ';') {
1522                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1523                         }
1524                         break;
1525                 case ';':
1526                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1527                         break;
1528                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1529                         break;
1530                 default:
1531                         fprintf(stderr, "erresc: unknown str ");
1532                         strdump();
1533                         break;
1534                 }
1535                 break;
1536         case 'k': /* old title set compatibility */
1537                 XStoreName(xw.dpy, xw.win, strescseq.buf);
1538                 break;
1539         case 'P': /* DSC -- Device Control String */
1540         case '_': /* APC -- Application Program Command */
1541         case '^': /* PM -- Privacy Message */
1542         default:
1543                 fprintf(stderr, "erresc: unknown str ");
1544                 strdump();
1545                 /* die(""); */
1546                 break;
1547         }
1548 }
1549
1550 void
1551 strparse(void) {
1552         /*
1553          * TODO: Implement parsing like for CSI when required.
1554          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1555          */
1556         return;
1557 }
1558
1559 void
1560 strdump(void) {
1561         int i;
1562         printf("ESC%c", strescseq.type);
1563         for(i = 0; i < strescseq.len; i++) {
1564                 uint c = strescseq.buf[i] & 0xff;
1565                 if(isprint(c)) putchar(c);
1566                 else if(c == '\n') printf("(\\n)");
1567                 else if(c == '\r') printf("(\\r)");
1568                 else if(c == 0x1b) printf("(\\e)");
1569                 else printf("(%02x)", c);
1570         }
1571         printf("ESC\\\n");
1572 }
1573
1574 void
1575 strreset(void) {
1576         memset(&strescseq, 0, sizeof(strescseq));
1577 }
1578
1579 void
1580 tputtab(bool forward) {
1581         unsigned x = term.c.x;
1582
1583         if(forward) {
1584                 if(x == term.col)
1585                         return;
1586                 for(++x; x < term.col && !term.tabs[x]; ++x)
1587                         /* nothing */ ;
1588         } else {
1589                 if(x == 0)
1590                         return;
1591                 for(--x; x > 0 && !term.tabs[x]; --x)
1592                         /* nothing */ ;
1593         }
1594         tmoveto(x, term.c.y);
1595 }
1596
1597 void
1598 tputc(char *c) {
1599         char ascii = *c;
1600
1601         if(iofd != -1)
1602                 write(iofd, c, 1);
1603
1604         if(term.esc & ESC_START) {
1605                 if(term.esc & ESC_CSI) {
1606                         csiescseq.buf[csiescseq.len++] = ascii;
1607                         if(BETWEEN(ascii, 0x40, 0x7E) || csiescseq.len >= ESC_BUF_SIZ) {
1608                                 term.esc = 0;
1609                                 csiparse(), csihandle();
1610                         }
1611                 } else if(term.esc & ESC_STR) {
1612                         switch(ascii) {
1613                         case '\033':
1614                                 term.esc = ESC_START | ESC_STR_END;
1615                                 break;
1616                         case '\a': /* backwards compatibility to xterm */
1617                                 term.esc = 0;
1618                                 strhandle();
1619                                 break;
1620                         default:
1621                                 strescseq.buf[strescseq.len++] = ascii;
1622                                 if(strescseq.len+1 >= STR_BUF_SIZ) {
1623                                         term.esc = 0;
1624                                         strhandle();
1625                                 }
1626                         }
1627                 } else if(term.esc & ESC_STR_END) {
1628                         term.esc = 0;
1629                         if(ascii == '\\')
1630                                 strhandle();
1631                 } else if(term.esc & ESC_ALTCHARSET) {
1632                         switch(ascii) {
1633                         case '0': /* Line drawing crap */
1634                                 term.c.attr.mode |= ATTR_GFX;
1635                                 break;
1636                         case 'B': /* Back to regular text */
1637                                 term.c.attr.mode &= ~ATTR_GFX;
1638                                 break;
1639                         default:
1640                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1641                         }
1642                         term.esc = 0;
1643                 } else {
1644                         switch(ascii) {
1645                         case '[':
1646                                 term.esc |= ESC_CSI;
1647                                 break;
1648                         case 'P': /* DCS -- Device Control String */
1649                         case '_': /* APC -- Application Program Command */
1650                         case '^': /* PM -- Privacy Message */
1651                         case ']': /* OSC -- Operating System Command */
1652                         case 'k': /* old title set compatibility */
1653                                 strreset();
1654                                 strescseq.type = ascii;
1655                                 term.esc |= ESC_STR;
1656                                 break;
1657                         case '(':
1658                                 term.esc |= ESC_ALTCHARSET;
1659                                 break;
1660                         case 'D': /* IND -- Linefeed */
1661                                 if(term.c.y == term.bot)
1662                                         tscrollup(term.top, 1);
1663                                 else
1664                                         tmoveto(term.c.x, term.c.y+1);
1665                                 term.esc = 0;
1666                                 break;
1667                         case 'E': /* NEL -- Next line */
1668                                 tnewline(1); /* always go to first col */
1669                                 term.esc = 0;
1670                                 break;
1671                         case 'H': /* HTS -- Horizontal tab stop */
1672                                 term.tabs[term.c.x] = 1;
1673                                 term.esc = 0;
1674                                 break;
1675                         case 'M': /* RI -- Reverse index */
1676                                 if(term.c.y == term.top)
1677                                         tscrolldown(term.top, 1);
1678                                 else
1679                                         tmoveto(term.c.x, term.c.y-1);
1680                                 term.esc = 0;
1681                                 break;
1682                         case 'c': /* RIS -- Reset to inital state */
1683                                 treset();
1684                                 term.esc = 0;
1685                                 xresettitle();
1686                                 break;
1687                         case '=': /* DECPAM -- Application keypad */
1688                                 term.mode |= MODE_APPKEYPAD;
1689                                 term.esc = 0;
1690                                 break;
1691                         case '>': /* DECPNM -- Normal keypad */
1692                                 term.mode &= ~MODE_APPKEYPAD;
1693                                 term.esc = 0;
1694                                 break;
1695                         case '7': /* DECSC -- Save Cursor */
1696                                 tcursor(CURSOR_SAVE);
1697                                 term.esc = 0;
1698                                 break;
1699                         case '8': /* DECRC -- Restore Cursor */
1700                                 tcursor(CURSOR_LOAD);
1701                                 term.esc = 0;
1702                                 break;
1703                         case '\\': /* ST -- Stop */
1704                                 term.esc = 0;
1705                                 break;
1706                         default:
1707                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1708                                     (uchar) ascii, isprint(ascii)?ascii:'.');
1709                                 term.esc = 0;
1710                         }
1711                 }
1712         } else {
1713                 if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
1714                         sel.bx = -1;
1715                 switch(ascii) {
1716                 case '\0': /* padding character, do nothing */
1717                         break;
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, char *ibfontstr) {
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         if((dc.ibfont.set = xinitfont(ibfontstr)) == NULL)
1946                 die("Can't load ibfont %s\n", ibfontstr);
1947
1948         xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1949             &dc.font.lbearing, &dc.font.rbearing);
1950         xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1951             &dc.bfont.lbearing, &dc.bfont.rbearing);
1952         xgetfontinfo(dc.ifont.set, &dc.ifont.ascent, &dc.ifont.descent,
1953             &dc.ifont.lbearing, &dc.ifont.rbearing);
1954         xgetfontinfo(dc.ibfont.set, &dc.ibfont.ascent, &dc.ibfont.descent,
1955             &dc.ibfont.lbearing, &dc.ibfont.rbearing);
1956 }
1957
1958 void
1959 xinit(void) {
1960         XSetWindowAttributes attrs;
1961         Cursor cursor;
1962         Window parent;
1963         int sw, sh, major, minor;
1964
1965         if(!(xw.dpy = XOpenDisplay(NULL)))
1966                 die("Can't open display\n");
1967         xw.scr = XDefaultScreen(xw.dpy);
1968
1969         /* font */
1970         initfonts(FONT, BOLDFONT, ITALICFONT, ITALICBOLDFONT);
1971
1972         /* XXX: Assuming same size for bold font */
1973         xw.cw = dc.font.rbearing - dc.font.lbearing;
1974         xw.ch = dc.font.ascent + dc.font.descent;
1975
1976         /* colors */
1977         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1978         xloadcols();
1979
1980         /* adjust fixed window geometry */
1981         if(xw.isfixed) {
1982                 sw = DisplayWidth(xw.dpy, xw.scr);
1983                 sh = DisplayHeight(xw.dpy, xw.scr);
1984                 if(xw.fx < 0)
1985                         xw.fx = sw + xw.fx - xw.fw - 1;
1986                 if(xw.fy < 0)
1987                         xw.fy = sh + xw.fy - xw.fh - 1;
1988
1989                 xw.h = xw.fh;
1990                 xw.w = xw.fw;
1991         } else {
1992                 /* window - default size */
1993                 xw.h = 2*BORDER + term.row * xw.ch;
1994                 xw.w = 2*BORDER + term.col * xw.cw;
1995                 xw.fx = 0;
1996                 xw.fy = 0;
1997         }
1998
1999         attrs.background_pixel = dc.col[DefaultBG];
2000         attrs.border_pixel = dc.col[DefaultBG];
2001         attrs.bit_gravity = NorthWestGravity;
2002         attrs.event_mask = FocusChangeMask | KeyPressMask
2003                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2004                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2005         attrs.colormap = xw.cmap;
2006
2007         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
2008         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2009                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2010                         XDefaultVisual(xw.dpy, xw.scr),
2011                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2012                         | CWColormap,
2013                         &attrs);
2014         if(!XdbeQueryExtension(xw.dpy, &major, &minor))
2015                 die("Xdbe extension is not present\n");
2016         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
2017
2018         /* input methods */
2019         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
2020         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2021                                            | XIMStatusNothing, XNClientWindow, xw.win,
2022                                            XNFocusWindow, xw.win, NULL);
2023         /* gc */
2024         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
2025
2026         /* white cursor, black outline */
2027         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2028         XDefineCursor(xw.dpy, xw.win, cursor);
2029         XRecolorCursor(xw.dpy, cursor,
2030                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2031                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2032
2033         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2034
2035         xresettitle();
2036         XMapWindow(xw.dpy, xw.win);
2037         xhints();
2038         XSync(xw.dpy, 0);
2039 }
2040
2041 void
2042 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2043         int fg = base.fg, bg = base.bg, temp;
2044         int winx = BORDER+x*xw.cw, winy = BORDER+y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
2045         XFontSet fontset = dc.font.set;
2046         int i;
2047
2048         /* only switch default fg/bg if term is in RV mode */
2049         if(IS_SET(MODE_REVERSE)) {
2050                 if(fg == DefaultFG)
2051                         fg = DefaultBG;
2052                 if(bg == DefaultBG)
2053                         bg = DefaultFG;
2054         }
2055
2056         if(base.mode & ATTR_REVERSE)
2057                 temp = fg, fg = bg, bg = temp;
2058
2059         if(base.mode & ATTR_BOLD) {
2060                 fg += 8;
2061                 fontset = dc.bfont.set;
2062         }
2063
2064         if(base.mode & ATTR_ITALIC)
2065                 fontset = dc.ifont.set;
2066         if(base.mode & (ATTR_ITALIC|ATTR_ITALIC))
2067                 fontset = dc.ibfont.set;
2068
2069         XSetBackground(xw.dpy, dc.gc, dc.col[bg]);
2070         XSetForeground(xw.dpy, dc.gc, dc.col[fg]);
2071
2072         if(base.mode & ATTR_GFX) {
2073                 for(i = 0; i < bytelen; i++) {
2074                         char c = gfx[(uint)s[i] % 256];
2075                         if(c)
2076                                 s[i] = c;
2077                         else if(s[i] > 0x5f)
2078                                 s[i] -= 0x5f;
2079                 }
2080         }
2081
2082         XmbDrawImageString(xw.dpy, xw.buf, fontset, dc.gc, winx, winy, s, bytelen);
2083
2084         if(base.mode & ATTR_UNDERLINE)
2085                 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+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         /* draw the new one */
2109         if(!(term.c.state & CURSOR_HIDE)) {
2110                 if(!(xw.state & WIN_FOCUSED))
2111                         g.bg = DefaultUCS;
2112
2113                 if(IS_SET(MODE_REVERSE))
2114                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
2115
2116                 sl = utf8size(g.c);
2117                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2118                 oldx = term.c.x, oldy = term.c.y;
2119         }
2120 }
2121
2122 void
2123 xresettitle(void) {
2124         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
2125 }
2126
2127 void
2128 redraw(void) {
2129         struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
2130         tfulldirt();
2131         draw();
2132         XSync(xw.dpy, False); /* necessary for a good tput flash */
2133         nanosleep(&tv, NULL);
2134 }
2135
2136 void
2137 draw() {
2138         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2139
2140         drawregion(0, 0, term.col, term.row);
2141         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2142 }
2143
2144 void
2145 drawregion(int x1, int y1, int x2, int y2) {
2146         int ic, ib, x, y, ox, sl;
2147         Glyph base, new;
2148         char buf[DRAW_BUF_SIZ];
2149         bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN);
2150
2151         if((sel.alt && !alt) || (!sel.alt && alt))
2152                 ena_sel = 0;
2153         if(!(xw.state & WIN_VISIBLE))
2154                 return;
2155
2156         for(y = y1; y < y2; y++) {
2157                 if(!term.dirty[y])
2158                         continue;
2159                 xclear(0, y, term.col, y);
2160                 term.dirty[y] = 0;
2161                 base = term.line[y][0];
2162                 ic = ib = ox = 0;
2163                 for(x = x1; x < x2; x++) {
2164                         new = term.line[y][x];
2165                         if(ena_sel && *(new.c) && selected(x, y))
2166                                 new.mode ^= ATTR_REVERSE;
2167                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
2168                                                   ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2169                                 xdraws(buf, base, ox, y, ic, ib);
2170                                 ic = ib = 0;
2171                         }
2172                         if(new.state & GLYPH_SET) {
2173                                 if(ib == 0) {
2174                                         ox = x;
2175                                         base = new;
2176                                 }
2177                                 sl = utf8size(new.c);
2178                                 memcpy(buf+ib, new.c, sl);
2179                                 ib += sl;
2180                                 ++ic;
2181                         }
2182                 }
2183                 if(ib > 0)
2184                         xdraws(buf, base, ox, y, ic, ib);
2185         }
2186         xdrawcursor();
2187 }
2188
2189 void
2190 expose(XEvent *ev) {
2191         XExposeEvent *e = &ev->xexpose;
2192         if(xw.state & WIN_REDRAW) {
2193                 if(!e->count)
2194                         xw.state &= ~WIN_REDRAW;
2195         }
2196 }
2197
2198 void
2199 visibility(XEvent *ev) {
2200         XVisibilityEvent *e = &ev->xvisibility;
2201         if(e->state == VisibilityFullyObscured)
2202                 xw.state &= ~WIN_VISIBLE;
2203         else if(!(xw.state & WIN_VISIBLE))
2204                 /* need a full redraw for next Expose, not just a buf copy */
2205                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2206 }
2207
2208 void
2209 unmap(XEvent *ev) {
2210         xw.state &= ~WIN_VISIBLE;
2211 }
2212
2213 void
2214 xseturgency(int add) {
2215         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2216         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2217         XSetWMHints(xw.dpy, xw.win, h);
2218         XFree(h);
2219 }
2220
2221 void
2222 focus(XEvent *ev) {
2223         if(ev->type == FocusIn) {
2224                 xw.state |= WIN_FOCUSED;
2225                 xseturgency(0);
2226         } else
2227                 xw.state &= ~WIN_FOCUSED;
2228 }
2229
2230 char*
2231 kmap(KeySym k, uint state) {
2232         int i;
2233         state &= ~Mod2Mask;
2234         for(i = 0; i < LEN(key); i++) {
2235                 uint mask = key[i].mask;
2236                 if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
2237                         return (char*)key[i].s;
2238         }
2239         return NULL;
2240 }
2241
2242 void
2243 kpress(XEvent *ev) {
2244         XKeyEvent *e = &ev->xkey;
2245         KeySym ksym;
2246         char buf[32];
2247         char *customkey;
2248         int len;
2249         int meta;
2250         int shift;
2251         Status status;
2252
2253         meta = e->state & Mod1Mask;
2254         shift = e->state & ShiftMask;
2255         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
2256
2257         /* 1. custom keys from config.h */
2258         if((customkey = kmap(ksym, e->state)))
2259                 ttywrite(customkey, strlen(customkey));
2260         /* 2. hardcoded (overrides X lookup) */
2261         else
2262                 switch(ksym) {
2263                 case XK_Up:
2264                 case XK_Down:
2265                 case XK_Left:
2266                 case XK_Right:
2267                         /* XXX: shift up/down doesn't work */
2268                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
2269                         ttywrite(buf, 3);
2270                         break;
2271                 case XK_Insert:
2272                         if(shift)
2273                                 selpaste();
2274                         break;
2275                 case XK_Return:
2276                         if(IS_SET(MODE_CRLF))
2277                                 ttywrite("\r\n", 2);
2278                         else
2279                                 ttywrite("\r", 1);
2280                         break;
2281                         /* 3. X lookup  */
2282                 default:
2283                         if(len > 0) {
2284                                 if(meta && len == 1)
2285                                         ttywrite("\033", 1);
2286                                 ttywrite(buf, len);
2287                         }
2288                         break;
2289                 }
2290 }
2291
2292 void
2293 cmessage(XEvent *e) {
2294         /* See xembed specs
2295            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2296         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2297                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2298                         xw.state |= WIN_FOCUSED;
2299                         xseturgency(0);
2300                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2301                         xw.state &= ~WIN_FOCUSED;
2302                 }
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 void
2326 run(void) {
2327         XEvent ev;
2328         fd_set rfd;
2329         int xfd = XConnectionNumber(xw.dpy);
2330
2331         for(;;) {
2332                 FD_ZERO(&rfd);
2333                 FD_SET(cmdfd, &rfd);
2334                 FD_SET(xfd, &rfd);
2335                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) < 0) {
2336                         if(errno == EINTR)
2337                                 continue;
2338                         die("select failed: %s\n", SERRNO);
2339                 }
2340                 if(FD_ISSET(cmdfd, &rfd))
2341                         ttyread();
2342
2343                 while(XPending(xw.dpy)) {
2344                         XNextEvent(xw.dpy, &ev);
2345                         if(XFilterEvent(&ev, xw.win))
2346                                 continue;
2347                         if(handler[ev.type])
2348                                 (handler[ev.type])(&ev);
2349                 }
2350
2351                 draw();
2352                 XFlush(xw.dpy);
2353         }
2354 }
2355
2356 int
2357 main(int argc, char *argv[]) {
2358         int i, bitm, xr, yr;
2359         unsigned int wr, hr;
2360
2361         xw.fw = xw.fh = xw.fx = xw.fy = 0;
2362         xw.isfixed = False;
2363
2364         for(i = 1; i < argc; i++) {
2365                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2366                 case 't':
2367                         if(++i < argc) opt_title = argv[i];
2368                         break;
2369                 case 'c':
2370                         if(++i < argc) opt_class = argv[i];
2371                         break;
2372                 case 'w':
2373                         if(++i < argc) opt_embed = argv[i];
2374                         break;
2375                 case 'f':
2376                         if(++i < argc) opt_io = argv[i];
2377                         break;
2378                 case 'e':
2379                         /* eat every remaining arguments */
2380                         if(++i < argc) opt_cmd = &argv[i];
2381                         goto run;
2382                 case 'g':
2383                         if(++i >= argc)
2384                                 break;
2385
2386                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
2387                         if(bitm & XValue)
2388                                 xw.fx = xr;
2389                         if(bitm & YValue)
2390                                 xw.fy = yr;
2391                         if(bitm & WidthValue)
2392                                 xw.fw = (int)wr;
2393                         if(bitm & HeightValue)
2394                                 xw.fh = (int)hr;
2395                         if(bitm & XNegative && xw.fx == 0)
2396                                 xw.fx = -1;
2397                         if(bitm & XNegative && xw.fy == 0)
2398                                 xw.fy = -1;
2399
2400                         if(xw.fh != 0 && xw.fw != 0)
2401                                 xw.isfixed = True;
2402                         break;
2403                 case 'v':
2404                 default:
2405                         die(USAGE);
2406                 }
2407         }
2408
2409  run:
2410         setlocale(LC_CTYPE, "");
2411         tnew(80, 24);
2412         ttynew();
2413         xinit();
2414         selinit();
2415         run();
2416         return 0;
2417 }
2418