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