st.c

   1 /* See LICENSE for licence details. */
   2 #define _XOPEN_SOURCE 600
   3 #include <ctype.h>
   4 #include <errno.h>
   5 #include <fcntl.h>
   6 #include <limits.h>
   7 #include <locale.h>
   8 #include <stdarg.h>
   9 #include <stdbool.h>
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <signal.h>
  14 #include <sys/ioctl.h>
  15 #include <sys/select.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18 #include <sys/types.h>
  19 #include <sys/wait.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <X11/Xatom.h>
  23 #include <X11/Xlib.h>
  24 #include <X11/Xutil.h>
  25 #include <X11/cursorfont.h>
  26 #include <X11/keysym.h>
  27 #include <X11/extensions/Xdbe.h>
  28
  29 #if   defined(__linux)
  30  #include <pty.h>
  31 #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  32  #include <util.h>
  33 #elif defined(__FreeBSD__) || defined(__DragonFly__)
  34  #include <libutil.h>
  35 #endif
  36
  37 #define USAGE \
  38         "st " VERSION " (c) 2010-2012 st engineers\n" \
  39         "usage: st [-t title] [-c class] [-g geometry]" \
  40         " [-w windowid] [-v] [-f file] [-e command...]\n"
  41
  42 /* XEMBED messages */
  43 #define XEMBED_FOCUS_IN  4
  44 #define XEMBED_FOCUS_OUT 5
  45
  46 /* Arbitrary sizes */
  47 #define ESC_BUF_SIZ   256
  48 #define ESC_ARG_SIZ   16
  49 #define STR_BUF_SIZ   256
  50 #define STR_ARG_SIZ   16
  51 #define DRAW_BUF_SIZ  1024
  52 #define UTF_SIZ       4
  53 #define XK_NO_MOD     UINT_MAX
  54 #define XK_ANY_MOD    0
  55
  56 #define SELECT_TIMEOUT (20*1000) /* 20 ms */
  57 #define DRAW_TIMEOUT  (20*1000) /* 20 ms */
  58 #define REDRAW_TIMEOUT (80*1000) /* 80 ms */
  59
  60 #define SERRNO strerror(errno)
  61 #define MIN(a, b)  ((a) < (b) ? (a) : (b))
  62 #define MAX(a, b)  ((a) < (b) ? (b) : (a))
  63 #define LEN(a)     (sizeof(a) / sizeof(a[0]))
  64 #define DEFAULT(a, b)     (a) = (a) ? (a) : (b)
  65 #define BETWEEN(x, a, b)  ((a) <= (x) && (x) <= (b))
  66 #define LIMIT(x, a, b)    (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
  67 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
  68 #define IS_SET(flag) (term.mode & (flag))
  69 #define TIMEDIFF(t1, t2) ((t1.tv_sec-t2.tv_sec)*1000 + (t1.tv_usec-t2.tv_usec)/1000)
  70 #define X2COL(x) (((x) - BORDER)/xw.cw)
  71 #define Y2ROW(y) (((y) - BORDER)/xw.ch)
  72
  73 enum glyph_attribute {
  74         ATTR_NULL      = 0,
  75         ATTR_REVERSE   = 1,
  76         ATTR_UNDERLINE = 2,
  77         ATTR_BOLD      = 4,
  78         ATTR_GFX       = 8,
  79         ATTR_ITALIC    = 16,
  80         ATTR_BLINK     = 32,
  81 };
  82
  83 enum cursor_movement {
  84         CURSOR_UP,
  85         CURSOR_DOWN,
  86         CURSOR_LEFT,
  87         CURSOR_RIGHT,
  88         CURSOR_SAVE,
  89         CURSOR_LOAD
  90 };
  91
  92 enum cursor_state {
  93         CURSOR_DEFAULT  = 0,
  94         CURSOR_HIDE     = 1,
  95         CURSOR_WRAPNEXT = 2
  96 };
  97
  98 enum glyph_state {
  99         GLYPH_SET   = 1,
 100         GLYPH_DIRTY = 2
 101 };
 102
 103 enum term_mode {
 104         MODE_WRAP       = 1,
 105         MODE_INSERT      = 2,
 106         MODE_APPKEYPAD   = 4,
 107         MODE_ALTSCREEN   = 8,
 108         MODE_CRLF       = 16,
 109         MODE_MOUSEBTN    = 32,
 110         MODE_MOUSEMOTION = 64,
 111         MODE_MOUSE       = 32|64,
 112         MODE_REVERSE     = 128
 113 };
 114
 115 enum escape_state {
 116         ESC_START      = 1,
 117         ESC_CSI = 2,
 118         ESC_STR = 4, /* DSC, OSC, PM, APC */
 119         ESC_ALTCHARSET = 8,
 120         ESC_STR_END    = 16, /* a final string was encountered */
 121 };
 122
 123 enum window_state {
 124         WIN_VISIBLE = 1,
 125         WIN_REDRAW  = 2,
 126         WIN_FOCUSED = 4
 127 };
 128
 129 /* bit macro */
 130 #undef B0
 131 enum { B0=1, B1=2, B2=4, B3=8, B4=16, B5=32, B6=64, B7=128 };
 132
 133 typedef unsigned char uchar;
 134 typedef unsigned int uint;
 135 typedef unsigned long ulong;
 136 typedef unsigned short ushort;
 137
 138 typedef struct {
 139         char c[UTF_SIZ];     /* character code */
 140         uchar mode;  /* attribute flags */
 141         ushort fg;   /* foreground  */
 142         ushort bg;   /* background  */
 143         uchar state; /* state flags    */
 144 } Glyph;
 145
 146 typedef Glyph* Line;
 147
 148 typedef struct {
 149         Glyph attr;      /* current char attributes */
 150         int x;
 151         int y;
 152         char state;
 153 } TCursor;
 154
 155 /* CSI Escape sequence structs */
 156 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
 157 typedef struct {
 158         char buf[ESC_BUF_SIZ]; /* raw string */
 159         int len;               /* raw string length */
 160         char priv;
 161         int arg[ESC_ARG_SIZ];
 162         int narg;             /* nb of args */
 163         char mode;
 164 } CSIEscape;
 165
 166 /* STR Escape sequence structs */
 167 /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
 168 typedef struct {
 169         char type;           /* ESC type ... */
 170         char buf[STR_BUF_SIZ]; /* raw string */
 171         int len;               /* raw string length */
 172         char *args[STR_ARG_SIZ];
 173         int narg;             /* nb of args */
 174 } STREscape;
 175
 176 /* Internal representation of the screen */
 177 typedef struct {
 178         int row;        /* nb row */
 179         int col;        /* nb col */
 180         Line* line;     /* screen */
 181         Line* alt;      /* alternate screen */
 182         bool* dirty;    /* dirtyness of lines */
 183         TCursor c;      /* cursor */
 184         int top;        /* top    scroll limit */
 185         int bot;        /* bottom scroll limit */
 186         int mode;       /* terminal mode flags */
 187         int esc;        /* escape state flags */
 188         bool *tabs;
 189 } Term;
 190
 191 /* Purely graphic info */
 192 typedef struct {
 193         Display* dpy;
 194         Colormap cmap;
 195         Window win;
 196         XdbeBackBuffer buf;
 197         Atom xembed;
 198         XIM xim;
 199         XIC xic;
 200         int scr;
 201         Bool isfixed; /* is fixed geometry? */
 202         int fx, fy, fw, fh; /* fixed geometry */
 203         int w;  /* window width */
 204         int h;  /* window height */
 205         int ch; /* char height */
 206         int cw; /* char width  */
 207         char state; /* focus, redraw, visible */
 208         struct timeval lastdraw;
 209 } XWindow;
 210
 211 typedef struct {
 212         KeySym k;
 213         uint mask;
 214         char s[ESC_BUF_SIZ];
 215 } Key;
 216
 217
 218 /* TODO: use better name for vars... */
 219 typedef struct {
 220         int mode;
 221         int bx, by;
 222         int ex, ey;
 223         struct {int x, y;} b, e;
 224         char *clip;
 225         Atom xtarget;
 226         bool alt;
 227         struct timeval tclick1;
 228         struct timeval tclick2;
 229 } Selection;
 230
 231 #include "config.h"
 232
 233 /* Drawing Context */
 234 typedef struct {
 235         ulong col[LEN(colorname) < 256 ? 256 : LEN(colorname)];
 236         GC gc;
 237         struct {
 238                 int ascent;
 239                 int descent;
 240                 short lbearing;
 241                 short rbearing;
 242                 XFontSet set;
 243         } font, bfont, ifont, ibfont;
 244 } DC;
 245
 246 static void die(const char*, ...);
 247 static void draw(void);
 248 static void redraw(void);
 249 static void drawregion(int, int, int, int);
 250 static void execsh(void);
 251 static void sigchld(int);
 252 static void run(void);
 253 static bool last_draw_too_old(void);
 254
 255 static void csidump(void);
 256 static void csihandle(void);
 257 static void csiparse(void);
 258 static void csireset(void);
 259 static void strdump(void);
 260 static void strhandle(void);
 261 static void strparse(void);
 262 static void strreset(void);
 263
 264 static void tclearregion(int, int, int, int);
 265 static void tcursor(int);
 266 static void tdeletechar(int);
 267 static void tdeleteline(int);
 268 static void tinsertblank(int);
 269 static void tinsertblankline(int);
 270 static void tmoveto(int, int);
 271 static void tnew(int, int);
 272 static void tnewline(int);
 273 static void tputtab(bool);
 274 static void tputc(char*);
 275 static void treset(void);
 276 static int tresize(int, int);
 277 static void tscrollup(int, int);
 278 static void tscrolldown(int, int);
 279 static void tsetattr(int*, int);
 280 static void tsetchar(char*);
 281 static void tsetscroll(int, int);
 282 static void tswapscreen(void);
 283 static void tsetdirt(int, int);
 284 static void tsetmode(bool, bool, int *, int);
 285 static void tfulldirt(void);
 286
 287 static void ttynew(void);
 288 static void ttyread(void);
 289 static void ttyresize(int, int);
 290 static void ttywrite(const char *, size_t);
 291
 292 static void xdraws(char *, Glyph, int, int, int, int);
 293 static void xhints(void);
 294 static void xclear(int, int, int, int);
 295 static void xcopy(void);
 296 static void xdrawcursor(void);
 297 static void xinit(void);
 298 static void xloadcols(void);
 299 static void xresettitle(void);
 300 static void xseturgency(int);
 301 static void xsetsel(char*);
 302 static void xresize(int, int);
 303
 304 static void expose(XEvent *);
 305 static void visibility(XEvent *);
 306 static void unmap(XEvent *);
 307 static char* kmap(KeySym, uint);
 308 static void kpress(XEvent *);
 309 static void cmessage(XEvent *);
 310 static void resize(XEvent *);
 311 static void focus(XEvent *);
 312 static void brelease(XEvent *);
 313 static void bpress(XEvent *);
 314 static void bmotion(XEvent *);
 315 static void selnotify(XEvent *);
 316 static void selclear(XEvent *);
 317 static void selrequest(XEvent *);
 318
 319 static void selinit(void);
 320 static inline bool selected(int, int);
 321 static void selcopy(void);
 322 static void selpaste(void);
 323 static void selscroll(int, int);
 324
 325 static int utf8decode(char *, long *);
 326 static int utf8encode(long *, char *);
 327 static int utf8size(char *);
 328 static int isfullutf8(char *, int);
 329
 330 static void *xmalloc(size_t);
 331 static void *xrealloc(void *, size_t);
 332
 333 static void (*handler[LASTEvent])(XEvent *) = {
 334         [KeyPress] = kpress,
 335         [ClientMessage] = cmessage,
 336         [ConfigureNotify] = resize,
 337         [VisibilityNotify] = visibility,
 338         [UnmapNotify] = unmap,
 339         [Expose] = expose,
 340         [FocusIn] = focus,
 341         [FocusOut] = focus,
 342         [MotionNotify] = bmotion,
 343         [ButtonPress] = bpress,
 344         [ButtonRelease] = brelease,
 345         [SelectionClear] = selclear,
 346         [SelectionNotify] = selnotify,
 347         [SelectionRequest] = selrequest,
 348 };
 349
 350 /* Globals */
 351 static DC dc;
 352 static XWindow xw;
 353 static Term term;
 354 static CSIEscape csiescseq;
 355 static STREscape strescseq;
 356 static int cmdfd;
 357 static pid_t pid;
 358 static Selection sel;
 359 static int iofd = -1;
 360 static char **opt_cmd  = NULL;
 361 static char *opt_io    = NULL;
 362 static char *opt_title = NULL;
 363 static char *opt_embed = NULL;
 364 static char *opt_class = NULL;
 365
 366 void *
 367 xmalloc(size_t len) {
 368         void *p = malloc(len);
 369         if(!p)
 370                 die("Out of memory");
 371         return p;
 372 }
 373
 374 void *
 375 xrealloc(void *p, size_t len) {
 376         if((p = realloc(p, len)) == NULL)
 377                 die("Out of memory");
 378         return p;
 379 }
 380
 381 int
 382 utf8decode(char *s, long *u) {
 383         uchar c;
 384         int i, n, rtn;
 385
 386         rtn = 1;
 387         c = *s;
 388         if(~c & B7) { /* 0xxxxxxx */
 389                 *u = c;
 390                 return rtn;
 391         } else if((c & (B7|B6|B5)) == (B7|B6)) { /* 110xxxxx */
 392                 *u = c&(B4|B3|B2|B1|B0);
 393                 n = 1;
 394         } else if((c & (B7|B6|B5|B4)) == (B7|B6|B5)) { /* 1110xxxx */
 395                 *u = c&(B3|B2|B1|B0);
 396                 n = 2;
 397         } else if((c & (B7|B6|B5|B4|B3)) == (B7|B6|B5|B4)) { /* 11110xxx */
 398                 *u = c & (B2|B1|B0);
 399                 n = 3;
 400         } else
 401                 goto invalid;
 402         for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
 403                 c = *s;
 404                 if((c & (B7|B6)) != B7) /* 10xxxxxx */
 405                         goto invalid;
 406                 *u <<= 6;
 407                 *u |= c & (B5|B4|B3|B2|B1|B0);
 408         }
 409         if((n == 1 && *u < 0x80) ||
 410            (n == 2 && *u < 0x800) ||
 411            (n == 3 && *u < 0x10000) ||
 412            (*u >= 0xD800 && *u <= 0xDFFF))
 413                 goto invalid;
 414         return rtn;
 415 invalid:
 416         *u = 0xFFFD;
 417         return rtn;
 418 }
 419
 420 int
 421 utf8encode(long *u, char *s) {
 422         uchar *sp;
 423         ulong uc;
 424         int i, n;
 425
 426         sp = (uchar*) s;
 427         uc = *u;
 428         if(uc < 0x80) {
 429                 *sp = uc; /* 0xxxxxxx */
 430                 return 1;
 431         } else if(*u < 0x800) {
 432                 *sp = (uc >> 6) | (B7|B6); /* 110xxxxx */
 433                 n = 1;
 434         } else if(uc < 0x10000) {
 435                 *sp = (uc >> 12) | (B7|B6|B5); /* 1110xxxx */
 436                 n = 2;
 437         } else if(uc <= 0x10FFFF) {
 438                 *sp = (uc >> 18) | (B7|B6|B5|B4); /* 11110xxx */
 439                 n = 3;
 440         } else {
 441                 goto invalid;
 442         }
 443         for(i=n,++sp; i>0; --i,++sp)
 444                 *sp = ((uc >> 6*(i-1)) & (B5|B4|B3|B2|B1|B0)) | B7; /* 10xxxxxx */
 445         return n+1;
 446 invalid:
 447         /* U+FFFD */
 448         *s++ = '\xEF';
 449         *s++ = '\xBF';
 450         *s = '\xBD';
 451         return 3;
 452 }
 453
 454 /* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
 455    UTF-8 otherwise return 0 */
 456 int
 457 isfullutf8(char *s, int b) {
 458         uchar *c1, *c2, *c3;
 459
 460         c1 = (uchar *) s;
 461         c2 = (uchar *) ++s;
 462         c3 = (uchar *) ++s;
 463         if(b < 1)
 464                 return 0;
 465         else if((*c1&(B7|B6|B5)) == (B7|B6) && b == 1)
 466                 return 0;
 467         else if((*c1&(B7|B6|B5|B4)) == (B7|B6|B5) &&
 468             ((b == 1) ||
 469             ((b == 2) && (*c2&(B7|B6)) == B7)))
 470                 return 0;
 471         else if((*c1&(B7|B6|B5|B4|B3)) == (B7|B6|B5|B4) &&
 472             ((b == 1) ||
 473             ((b == 2) && (*c2&(B7|B6)) == B7) ||
 474             ((b == 3) && (*c2&(B7|B6)) == B7 && (*c3&(B7|B6)) == B7)))
 475                 return 0;
 476         else
 477                 return 1;
 478 }
 479
 480 int
 481 utf8size(char *s) {
 482         uchar c = *s;
 483
 484         if(~c&B7)
 485                 return 1;
 486         else if((c&(B7|B6|B5)) == (B7|B6))
 487                 return 2;
 488         else if((c&(B7|B6|B5|B4)) == (B7|B6|B5))
 489                 return 3;
 490         else
 491                 return 4;
 492 }
 493
 494 void
 495 selinit(void) {
 496         memset(&sel.tclick1, 0, sizeof(sel.tclick1));
 497         memset(&sel.tclick2, 0, sizeof(sel.tclick2));
 498         sel.mode = 0;
 499         sel.bx = -1;
 500         sel.clip = NULL;
 501         sel.xtarget = XInternAtom(xw.dpy, "UTF8_STRING", 0);
 502         if(sel.xtarget == None)
 503                 sel.xtarget = XA_STRING;
 504 }
 505
 506 static inline bool
 507 selected(int x, int y) {
 508         if(sel.ey == y && sel.by == y) {
 509                 int bx = MIN(sel.bx, sel.ex);
 510                 int ex = MAX(sel.bx, sel.ex);
 511                 return BETWEEN(x, bx, ex);
 512         }
 513         return ((sel.b.y < y&&y < sel.e.y) || (y==sel.e.y && x<=sel.e.x))
 514                 || (y==sel.b.y && x>=sel.b.x && (x<=sel.e.x || sel.b.y!=sel.e.y));
 515 }
 516
 517 void
 518 getbuttoninfo(XEvent *e, int *b, int *x, int *y) {
 519         if(b)
 520                 *b = e->xbutton.button;
 521
 522         *x = X2COL(e->xbutton.x);
 523         *y = Y2ROW(e->xbutton.y);
 524         sel.b.x = sel.by < sel.ey ? sel.bx : sel.ex;
 525         sel.b.y = MIN(sel.by, sel.ey);
 526         sel.e.x = sel.by < sel.ey ? sel.ex : sel.bx;
 527         sel.e.y = MAX(sel.by, sel.ey);
 528 }
 529
 530 void
 531 mousereport(XEvent *e) {
 532         int x = X2COL(e->xbutton.x);
 533         int y = Y2ROW(e->xbutton.y);
 534         int button = e->xbutton.button;
 535         int state = e->xbutton.state;
 536         char buf[] = { '\033', '[', 'M', 0, 32+x+1, 32+y+1 };
 537         static int ob, ox, oy;
 538
 539         /* from urxvt */
 540         if(e->xbutton.type == MotionNotify) {
 541                 if(!IS_SET(MODE_MOUSEMOTION) || (x == ox && y == oy))
 542                         return;
 543                 button = ob + 32;
 544                 ox = x, oy = y;
 545         } else if(e->xbutton.type == ButtonRelease || button == AnyButton) {
 546                 button = 3;
 547         } else {
 548                 button -= Button1;
 549                 if(button >= 3)
 550                         button += 64 - 3;
 551                 if(e->xbutton.type == ButtonPress) {
 552                         ob = button;
 553                         ox = x, oy = y;
 554                 }
 555         }
 556
 557         buf[3] = 32 + button + (state & ShiftMask ? 4 : 0)
 558                 + (state & Mod4Mask    ? 8  : 0)
 559                 + (state & ControlMask ? 16 : 0);
 560
 561         ttywrite(buf, sizeof(buf));
 562 }
 563
 564 void
 565 bpress(XEvent *e) {
 566         if(IS_SET(MODE_MOUSE))
 567                 mousereport(e);
 568         else if(e->xbutton.button == Button1) {
 569                 if(sel.bx != -1)
 570                         tsetdirt(sel.b.y, sel.e.y);
 571                 sel.mode = 1;
 572                 sel.ex = sel.bx = X2COL(e->xbutton.x);
 573                 sel.ey = sel.by = Y2ROW(e->xbutton.y);
 574         }
 575 }
 576
 577 void
 578 selcopy(void) {
 579         char *str, *ptr;
 580         int x, y, bufsize, is_selected = 0;
 581
 582         if(sel.bx == -1)
 583                 str = NULL;
 584
 585         else {
 586                 bufsize = (term.col+1) * (sel.e.y-sel.b.y+1) * UTF_SIZ;
 587                 ptr = str = xmalloc(bufsize);
 588
 589                 /* append every set & selected glyph to the selection */
 590                 for(y = 0; y < term.row; y++) {
 591                         for(x = 0; x < term.col; x++) {
 592                                 is_selected = selected(x, y);
 593                                 if((term.line[y][x].state & GLYPH_SET) && is_selected) {
 594                                         int size = utf8size(term.line[y][x].c);
 595                                         memcpy(ptr, term.line[y][x].c, size);
 596                                         ptr += size;
 597                                 }
 598                         }
 599
 600                         /* \n at the end of every selected line except for the last one */
 601                         if(is_selected && y < sel.e.y)
 602                                 *ptr++ = '\n';
 603                 }
 604                 *ptr = 0;
 605         }
 606         sel.alt = IS_SET(MODE_ALTSCREEN);
 607         xsetsel(str);
 608 }
 609
 610 void
 611 selnotify(XEvent *e) {
 612         ulong nitems, ofs, rem;
 613         int format;
 614         uchar *data;
 615         Atom type;
 616
 617         ofs = 0;
 618         do {
 619                 if(XGetWindowProperty(xw.dpy, xw.win, XA_PRIMARY, ofs, BUFSIZ/4,
 620                                         False, AnyPropertyType, &type, &format,
 621                                         &nitems, &rem, &data)) {
 622                         fprintf(stderr, "Clipboard allocation failed\n");
 623                         return;
 624                 }
 625                 ttywrite((const char *) data, nitems * format / 8);
 626                 XFree(data);
 627                 /* number of 32-bit chunks returned */
 628                 ofs += nitems * format / 32;
 629         } while(rem > 0);
 630 }
 631
 632 void
 633 selpaste() {
 634         XConvertSelection(xw.dpy, XA_PRIMARY, sel.xtarget, XA_PRIMARY, xw.win, CurrentTime);
 635 }
 636
 637 void selclear(XEvent *e) {
 638         if(sel.bx == -1)
 639                 return;
 640         sel.bx = -1;
 641         tsetdirt(sel.b.y, sel.e.y);
 642         draw();
 643 }
 644
 645 void
 646 selrequest(XEvent *e) {
 647         XSelectionRequestEvent *xsre;
 648         XSelectionEvent xev;
 649         Atom xa_targets;
 650
 651         xsre = (XSelectionRequestEvent *) e;
 652         xev.type = SelectionNotify;
 653         xev.requestor = xsre->requestor;
 654         xev.selection = xsre->selection;
 655         xev.target = xsre->target;
 656         xev.time = xsre->time;
 657         /* reject */
 658         xev.property = None;
 659
 660         xa_targets = XInternAtom(xw.dpy, "TARGETS", 0);
 661         if(xsre->target == xa_targets) {
 662                 /* respond with the supported type */
 663                 Atom string = sel.xtarget;
 664                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 665                                 XA_ATOM, 32, PropModeReplace,
 666                                 (uchar *) &string, 1);
 667                 xev.property = xsre->property;
 668         } else if(xsre->target == sel.xtarget && sel.clip != NULL) {
 669                 XChangeProperty(xsre->display, xsre->requestor, xsre->property,
 670                                 xsre->target, 8, PropModeReplace,
 671                                 (uchar *) sel.clip, strlen(sel.clip));
 672                 xev.property = xsre->property;
 673         }
 674
 675         /* all done, send a notification to the listener */
 676         if(!XSendEvent(xsre->display, xsre->requestor, True, 0, (XEvent *) &xev))
 677                 fprintf(stderr, "Error sending SelectionNotify event\n");
 678 }
 679
 680 void
 681 xsetsel(char *str) {
 682         /* register the selection for both the clipboard and the primary */
 683         Atom clipboard;
 684
 685         free(sel.clip);
 686         sel.clip = str;
 687
 688         XSetSelectionOwner(xw.dpy, XA_PRIMARY, xw.win, CurrentTime);
 689
 690         clipboard = XInternAtom(xw.dpy, "CLIPBOARD", 0);
 691         XSetSelectionOwner(xw.dpy, clipboard, xw.win, CurrentTime);
 692
 693         XFlush(xw.dpy);
 694 }
 695
 696 void
 697 brelease(XEvent *e) {
 698         if(IS_SET(MODE_MOUSE)) {
 699                 mousereport(e);
 700                 return;
 701         }
 702         if(e->xbutton.button == Button2)
 703                 selpaste();
 704         else if(e->xbutton.button == Button1) {
 705                 sel.mode = 0;
 706                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 707                 term.dirty[sel.ey] = 1;
 708                 if(sel.bx == sel.ex && sel.by == sel.ey) {
 709                         struct timeval now;
 710                         sel.bx = -1;
 711                         gettimeofday(&now, NULL);
 712
 713                         if(TIMEDIFF(now, sel.tclick2) <= TRIPLECLICK_TIMEOUT) {
 714                                 /* triple click on the line */
 715                                 sel.b.x = sel.bx = 0;
 716                                 sel.e.x = sel.ex = term.col;
 717                                 sel.b.y = sel.e.y = sel.ey;
 718                                 selcopy();
 719                         } else if(TIMEDIFF(now, sel.tclick1) <= DOUBLECLICK_TIMEOUT) {
 720                                 /* double click to select word */
 721                                 sel.bx = sel.ex;
 722                                 while(sel.bx > 0 && term.line[sel.ey][sel.bx-1].state & GLYPH_SET &&
 723                                           term.line[sel.ey][sel.bx-1].c[0] != ' ') sel.bx--;
 724                                 sel.b.x = sel.bx;
 725                                 while(sel.ex < term.col-1 && term.line[sel.ey][sel.ex+1].state & GLYPH_SET &&
 726                                           term.line[sel.ey][sel.ex+1].c[0] != ' ') sel.ex++;
 727                                 sel.e.x = sel.ex;
 728                                 sel.b.y = sel.e.y = sel.ey;
 729                                 selcopy();
 730                         }
 731                 } else
 732                         selcopy();
 733         }
 734         memcpy(&sel.tclick2, &sel.tclick1, sizeof(struct timeval));
 735         gettimeofday(&sel.tclick1, NULL);
 736         draw();
 737 }
 738
 739 void
 740 bmotion(XEvent *e) {
 741         if(IS_SET(MODE_MOUSE)) {
 742                 mousereport(e);
 743                 return;
 744         }
 745         if(sel.mode) {
 746                 int oldey = sel.ey, oldex = sel.ex;
 747                 getbuttoninfo(e, NULL, &sel.ex, &sel.ey);
 748
 749                 if(oldey != sel.ey || oldex != sel.ex) {
 750                         int starty = MIN(oldey, sel.ey);
 751                         int endy = MAX(oldey, sel.ey);
 752                         tsetdirt(starty, endy);
 753                         draw();
 754                 }
 755         }
 756 }
 757
 758 void
 759 die(const char *errstr, ...) {
 760         va_list ap;
 761
 762         va_start(ap, errstr);
 763         vfprintf(stderr, errstr, ap);
 764         va_end(ap);
 765         exit(EXIT_FAILURE);
 766 }
 767
 768 void
 769 execsh(void) {
 770         char **args;
 771         char *envshell = getenv("SHELL");
 772
 773         unsetenv("COLUMNS");
 774         unsetenv("LINES");
 775         unsetenv("TERMCAP");
 776
 777         signal(SIGCHLD, SIG_DFL);
 778         signal(SIGHUP, SIG_DFL);
 779         signal(SIGINT, SIG_DFL);
 780         signal(SIGQUIT, SIG_DFL);
 781         signal(SIGTERM, SIG_DFL);
 782         signal(SIGALRM, SIG_DFL);
 783
 784         DEFAULT(envshell, SHELL);
 785         putenv("TERM="TNAME);
 786         args = opt_cmd ? opt_cmd : (char*[]){envshell, "-i", NULL};
 787         execvp(args[0], args);
 788         exit(EXIT_FAILURE);
 789 }
 790
 791 void
 792 sigchld(int a) {
 793         int stat = 0;
 794         if(waitpid(pid, &stat, 0) < 0)
 795                 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
 796         if(WIFEXITED(stat))
 797                 exit(WEXITSTATUS(stat));
 798         else
 799                 exit(EXIT_FAILURE);
 800 }
 801
 802 void
 803 ttynew(void) {
 804         int m, s;
 805
 806         /* seems to work fine on linux, openbsd and freebsd */
 807         struct winsize w = {term.row, term.col, 0, 0};
 808         if(openpty(&m, &s, NULL, NULL, &w) < 0)
 809                 die("openpty failed: %s\n", SERRNO);
 810
 811         switch(pid = fork()) {
 812         case -1:
 813                 die("fork failed\n");
 814                 break;
 815         case 0:
 816                 setsid(); /* create a new process group */
 817                 dup2(s, STDIN_FILENO);
 818                 dup2(s, STDOUT_FILENO);
 819                 dup2(s, STDERR_FILENO);
 820                 if(ioctl(s, TIOCSCTTY, NULL) < 0)
 821                         die("ioctl TIOCSCTTY failed: %s\n", SERRNO);
 822                 close(s);
 823                 close(m);
 824                 execsh();
 825                 break;
 826         default:
 827                 close(s);
 828                 cmdfd = m;
 829                 signal(SIGCHLD, sigchld);
 830                 if(opt_io) {
 831                         if(!strcmp(opt_io, "-")) {
 832                                 iofd = STDOUT_FILENO;
 833                         } else {
 834                                 if((iofd = open(opt_io, O_WRONLY | O_CREAT, 0666)) < 0) {
 835                                         fprintf(stderr, "Error opening %s:%s\n",
 836                                                 opt_io, strerror(errno));
 837                                 }
 838                         }
 839                 }
 840         }
 841 }
 842
 843 void
 844 dump(char c) {
 845         static int col;
 846         fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
 847         if(++col % 10 == 0)
 848                 fprintf(stderr, "\n");
 849 }
 850
 851 void
 852 ttyread(void) {
 853         static char buf[BUFSIZ];
 854         static int buflen = 0;
 855         char *ptr;
 856         char s[UTF_SIZ];
 857         int charsize; /* size of utf8 char in bytes */
 858         long utf8c;
 859         int ret;
 860
 861         /* append read bytes to unprocessed bytes */
 862         if((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
 863                 die("Couldn't read from shell: %s\n", SERRNO);
 864
 865         /* process every complete utf8 char */
 866         buflen += ret;
 867         ptr = buf;
 868         while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
 869                 charsize = utf8decode(ptr, &utf8c);
 870                 utf8encode(&utf8c, s);
 871                 tputc(s);
 872                 ptr    += charsize;
 873                 buflen -= charsize;
 874         }
 875
 876         /* keep any uncomplete utf8 char for the next call */
 877         memmove(buf, ptr, buflen);
 878 }
 879
 880 void
 881 ttywrite(const char *s, size_t n) {
 882         if(write(cmdfd, s, n) == -1)
 883                 die("write error on tty: %s\n", SERRNO);
 884 }
 885
 886 void
 887 ttyresize(int x, int y) {
 888         struct winsize w;
 889
 890         w.ws_row = term.row;
 891         w.ws_col = term.col;
 892         w.ws_xpixel = xw.w;
 893         w.ws_ypixel = xw.h;
 894         if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
 895                 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
 896 }
 897
 898 void
 899 tsetdirt(int top, int bot)
 900 {
 901         int i;
 902
 903         LIMIT(top, 0, term.row-1);
 904         LIMIT(bot, 0, term.row-1);
 905
 906         for(i = top; i <= bot; i++)
 907                 term.dirty[i] = 1;
 908 }
 909
 910 void
 911 tfulldirt(void)
 912 {
 913         tsetdirt(0, term.row-1);
 914 }
 915
 916 void
 917 tcursor(int mode) {
 918         static TCursor c;
 919
 920         if(mode == CURSOR_SAVE)
 921                 c = term.c;
 922         else if(mode == CURSOR_LOAD)
 923                 term.c = c, tmoveto(c.x, c.y);
 924 }
 925
 926 void
 927 treset(void) {
 928         unsigned i;
 929         term.c = (TCursor){{
 930                 .mode = ATTR_NULL,
 931                 .fg = DefaultFG,
 932                 .bg = DefaultBG
 933         }, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
 934
 935         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 936         for(i = TAB; i < term.col; i += TAB)
 937                 term.tabs[i] = 1;
 938         term.top = 0, term.bot = term.row - 1;
 939         term.mode = MODE_WRAP;
 940         tclearregion(0, 0, term.col-1, term.row-1);
 941 }
 942
 943 void
 944 tnew(int col, int row) {
 945         /* set screen size */
 946         term.row = row, term.col = col;
 947         term.line = xmalloc(term.row * sizeof(Line));
 948         term.alt  = xmalloc(term.row * sizeof(Line));
 949         term.dirty = xmalloc(term.row * sizeof(*term.dirty));
 950         term.tabs = xmalloc(term.col * sizeof(*term.tabs));
 951
 952         for(row = 0; row < term.row; row++) {
 953                 term.line[row] = xmalloc(term.col * sizeof(Glyph));
 954                 term.alt [row] = xmalloc(term.col * sizeof(Glyph));
 955                 term.dirty[row] = 0;
 956         }
 957         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
 958         /* setup screen */
 959         treset();
 960 }
 961
 962 void
 963 tswapscreen(void) {
 964         Line* tmp = term.line;
 965         term.line = term.alt;
 966         term.alt = tmp;
 967         term.mode ^= MODE_ALTSCREEN;
 968         tfulldirt();
 969 }
 970
 971 void
 972 tscrolldown(int orig, int n) {
 973         int i;
 974         Line temp;
 975
 976         LIMIT(n, 0, term.bot-orig+1);
 977
 978         tclearregion(0, term.bot-n+1, term.col-1, term.bot);
 979
 980         for(i = term.bot; i >= orig+n; i--) {
 981                 temp = term.line[i];
 982                 term.line[i] = term.line[i-n];
 983                 term.line[i-n] = temp;
 984
 985                 term.dirty[i] = 1;
 986                 term.dirty[i-n] = 1;
 987         }
 988
 989         selscroll(orig, n);
 990 }
 991
 992 void
 993 tscrollup(int orig, int n) {
 994         int i;
 995         Line temp;
 996         LIMIT(n, 0, term.bot-orig+1);
 997
 998         tclearregion(0, orig, term.col-1, orig+n-1);
 999
1000         for(i = orig; i <= term.bot-n; i++) {
1001                  temp = term.line[i];
1002                  term.line[i] = term.line[i+n];
1003                  term.line[i+n] = temp;
1004
1005                  term.dirty[i] = 1;
1006                  term.dirty[i+n] = 1;
1007         }
1008
1009         selscroll(orig, -n);
1010 }
1011
1012 void
1013 selscroll(int orig, int n) {
1014         if(sel.bx == -1)
1015                 return;
1016
1017         if(BETWEEN(sel.by, orig, term.bot) || BETWEEN(sel.ey, orig, term.bot)) {
1018                 if((sel.by += n) > term.bot || (sel.ey += n) < term.top) {
1019                         sel.bx = -1;
1020                         return;
1021                 }
1022                 if(sel.by < term.top) {
1023                         sel.by = term.top;
1024                         sel.bx = 0;
1025                 }
1026                 if(sel.ey > term.bot) {
1027                         sel.ey = term.bot;
1028                         sel.ex = term.col;
1029                 }
1030                 sel.b.y = sel.by, sel.b.x = sel.bx;
1031                 sel.e.y = sel.ey, sel.e.x = sel.ex;
1032         }
1033 }
1034
1035 void
1036 tnewline(int first_col) {
1037         int y = term.c.y;
1038         if(y == term.bot)
1039                 tscrollup(term.top, 1);
1040         else
1041                 y++;
1042         tmoveto(first_col ? 0 : term.c.x, y);
1043 }
1044
1045 void
1046 csiparse(void) {
1047         /* int noarg = 1; */
1048         char *p = csiescseq.buf;
1049
1050         csiescseq.narg = 0;
1051         if(*p == '?')
1052                 csiescseq.priv = 1, p++;
1053
1054         while(p < csiescseq.buf+csiescseq.len) {
1055                 while(isdigit(*p)) {
1056                         csiescseq.arg[csiescseq.narg] *= 10;
1057                         csiescseq.arg[csiescseq.narg] += *p++ - '0'/*, noarg = 0 */;
1058                 }
1059                 if(*p == ';' && csiescseq.narg+1 < ESC_ARG_SIZ)
1060                         csiescseq.narg++, p++;
1061                 else {
1062                         csiescseq.mode = *p;
1063                         csiescseq.narg++;
1064                         return;
1065                 }
1066         }
1067 }
1068
1069 void
1070 tmoveto(int x, int y) {
1071         LIMIT(x, 0, term.col-1);
1072         LIMIT(y, 0, term.row-1);
1073         term.c.state &= ~CURSOR_WRAPNEXT;
1074         term.c.x = x;
1075         term.c.y = y;
1076 }
1077
1078 void
1079 tsetchar(char *c) {
1080         term.dirty[term.c.y] = 1;
1081         term.line[term.c.y][term.c.x] = term.c.attr;
1082         memcpy(term.line[term.c.y][term.c.x].c, c, UTF_SIZ);
1083         term.line[term.c.y][term.c.x].state |= GLYPH_SET;
1084 }
1085
1086 void
1087 tclearregion(int x1, int y1, int x2, int y2) {
1088         int x, y, temp;
1089
1090         if(x1 > x2)
1091                 temp = x1, x1 = x2, x2 = temp;
1092         if(y1 > y2)
1093                 temp = y1, y1 = y2, y2 = temp;
1094
1095         LIMIT(x1, 0, term.col-1);
1096         LIMIT(x2, 0, term.col-1);
1097         LIMIT(y1, 0, term.row-1);
1098         LIMIT(y2, 0, term.row-1);
1099
1100         for(y = y1; y <= y2; y++) {
1101                 term.dirty[y] = 1;
1102                 for(x = x1; x <= x2; x++)
1103                         term.line[y][x].state = 0;
1104         }
1105 }
1106
1107 void
1108 tdeletechar(int n) {
1109         int src = term.c.x + n;
1110         int dst = term.c.x;
1111         int size = term.col - src;
1112
1113         term.dirty[term.c.y] = 1;
1114
1115         if(src >= term.col) {
1116                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1117                 return;
1118         }
1119         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1120         tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
1121 }
1122
1123 void
1124 tinsertblank(int n) {
1125         int src = term.c.x;
1126         int dst = src + n;
1127         int size = term.col - dst;
1128
1129         term.dirty[term.c.y] = 1;
1130
1131         if(dst >= term.col) {
1132                 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1133                 return;
1134         }
1135         memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
1136         tclearregion(src, term.c.y, dst - 1, term.c.y);
1137 }
1138
1139 void
1140 tinsertblankline(int n) {
1141         if(term.c.y < term.top || term.c.y > term.bot)
1142                 return;
1143
1144         tscrolldown(term.c.y, n);
1145 }
1146
1147 void
1148 tdeleteline(int n) {
1149         if(term.c.y < term.top || term.c.y > term.bot)
1150                 return;
1151
1152         tscrollup(term.c.y, n);
1153 }
1154
1155 void
1156 tsetattr(int *attr, int l) {
1157         int i;
1158
1159         for(i = 0; i < l; i++) {
1160                 switch(attr[i]) {
1161                 case 0:
1162                         term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD \
1163                                         | ATTR_ITALIC | ATTR_BLINK);
1164                         term.c.attr.fg = DefaultFG;
1165                         term.c.attr.bg = DefaultBG;
1166                         break;
1167                 case 1:
1168                         term.c.attr.mode |= ATTR_BOLD;
1169                         break;
1170                 case 3: /* enter standout (highlight) */
1171                         term.c.attr.mode |= ATTR_ITALIC;
1172                         break;
1173                 case 4:
1174                         term.c.attr.mode |= ATTR_UNDERLINE;
1175                         break;
1176                 case 5:
1177                         term.c.attr.mode |= ATTR_BLINK;
1178                         break;
1179                 case 7:
1180                         term.c.attr.mode |= ATTR_REVERSE;
1181                         break;
1182                 case 21:
1183                 case 22:
1184                         term.c.attr.mode &= ~ATTR_BOLD;
1185                         break;
1186                 case 23: /* leave standout (highlight) mode */
1187                         term.c.attr.mode &= ~ATTR_ITALIC;
1188                         break;
1189                 case 24:
1190                         term.c.attr.mode &= ~ATTR_UNDERLINE;
1191                         break;
1192                 case 25:
1193                         term.c.attr.mode &= ~ATTR_BLINK;
1194                         break;
1195                 case 27:
1196                         term.c.attr.mode &= ~ATTR_REVERSE;
1197                         break;
1198                 case 38:
1199                         if(i + 2 < l && attr[i + 1] == 5) {
1200                                 i += 2;
1201                                 if(BETWEEN(attr[i], 0, 255))
1202                                         term.c.attr.fg = attr[i];
1203                                 else
1204                                         fprintf(stderr, "erresc: bad fgcolor %d\n", attr[i]);
1205                         }
1206                         else
1207                                 fprintf(stderr, "erresc(38): gfx attr %d unknown\n", attr[i]);
1208                         break;
1209                 case 39:
1210                         term.c.attr.fg = DefaultFG;
1211                         break;
1212                 case 48:
1213                         if(i + 2 < l && attr[i + 1] == 5) {
1214                                 i += 2;
1215                                 if(BETWEEN(attr[i], 0, 255))
1216                                         term.c.attr.bg = attr[i];
1217                                 else
1218                                         fprintf(stderr, "erresc: bad bgcolor %d\n", attr[i]);
1219                         }
1220                         else
1221                                 fprintf(stderr, "erresc(48): gfx attr %d unknown\n", attr[i]);
1222                         break;
1223                 case 49:
1224                         term.c.attr.bg = DefaultBG;
1225                         break;
1226                 default:
1227                         if(BETWEEN(attr[i], 30, 37))
1228                                 term.c.attr.fg = attr[i] - 30;
1229                         else if(BETWEEN(attr[i], 40, 47))
1230                                 term.c.attr.bg = attr[i] - 40;
1231                         else if(BETWEEN(attr[i], 90, 97))
1232                                 term.c.attr.fg = attr[i] - 90 + 8;
1233                         else if(BETWEEN(attr[i], 100, 107))
1234                                 term.c.attr.bg = attr[i] - 100 + 8;
1235                         else
1236                                 fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]), csidump();
1237                         break;
1238                 }
1239         }
1240 }
1241
1242 void
1243 tsetscroll(int t, int b) {
1244         int temp;
1245
1246         LIMIT(t, 0, term.row-1);
1247         LIMIT(b, 0, term.row-1);
1248         if(t > b) {
1249                 temp = t;
1250                 t = b;
1251                 b = temp;
1252         }
1253         term.top = t;
1254         term.bot = b;
1255 }
1256
1257 #define MODBIT(x, set, bit) ((set) ? ((x) |= (bit)) : ((x) &= ~(bit)))
1258
1259 void
1260 tsetmode(bool priv, bool set, int *args, int narg) {
1261         int *lim, mode;
1262
1263         for(lim = args + narg; args < lim; ++args) {
1264                 if(priv) {
1265                         switch(*args) {
1266                         case 1:
1267                                 MODBIT(term.mode, set, MODE_APPKEYPAD);
1268                                 break;
1269                         case 5: /* DECSCNM -- Reverve video */
1270                                 mode = term.mode;
1271                                 MODBIT(term.mode,set, MODE_REVERSE);
1272                                 if(mode != term.mode)
1273                                         redraw();
1274                                 break;
1275                         case 7:
1276                                 MODBIT(term.mode, set, MODE_WRAP);
1277                                 break;
1278                         case 20:
1279                                 MODBIT(term.mode, set, MODE_CRLF);
1280                                 break;
1281                         case 12: /* att610 -- Start blinking cursor (IGNORED) */
1282                                 break;
1283                         case 25:
1284                                 MODBIT(term.c.state, !set, CURSOR_HIDE);
1285                                 break;
1286                         case 1000: /* 1000,1002: enable xterm mouse report */
1287                                 MODBIT(term.mode, set, MODE_MOUSEBTN);
1288                                 break;
1289                         case 1002:
1290                                 MODBIT(term.mode, set, MODE_MOUSEMOTION);
1291                                 break;
1292                         case 1049: /* = 1047 and 1048 */
1293                         case 47:
1294                         case 1047:
1295                                 if(IS_SET(MODE_ALTSCREEN))
1296                                         tclearregion(0, 0, term.col-1, term.row-1);
1297                                 if((set && !IS_SET(MODE_ALTSCREEN)) ||
1298                                     (!set && IS_SET(MODE_ALTSCREEN))) {
1299                                             tswapscreen();
1300                                 }
1301                                 if(*args != 1049)
1302                                         break;
1303                                 /* pass through */
1304                         case 1048:
1305                                 tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
1306                                 break;
1307                         default:
1308                                 fprintf(stderr,
1309                                         "erresc: unknown private set/reset mode %d\n",
1310                                         *args);
1311                                 break;
1312                         }
1313                 } else {
1314                         switch(*args) {
1315                         case 4:
1316                                 MODBIT(term.mode, set, MODE_INSERT);
1317                                 break;
1318                         default:
1319                                 fprintf(stderr,
1320                                         "erresc: unknown set/reset mode %d\n",
1321                                         *args);
1322                                 break;
1323                         }
1324                 }
1325         }
1326 }
1327 #undef MODBIT
1328
1329
1330 void
1331 csihandle(void) {
1332         switch(csiescseq.mode) {
1333         default:
1334         unknown:
1335                 fprintf(stderr, "erresc: unknown csi ");
1336                 csidump();
1337                 /* die(""); */
1338                 break;
1339         case '@': /* ICH -- Insert <n> blank char */
1340                 DEFAULT(csiescseq.arg[0], 1);
1341                 tinsertblank(csiescseq.arg[0]);
1342                 break;
1343         case 'A': /* CUU -- Cursor <n> Up */
1344         case 'e':
1345                 DEFAULT(csiescseq.arg[0], 1);
1346                 tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
1347                 break;
1348         case 'B': /* CUD -- Cursor <n> Down */
1349                 DEFAULT(csiescseq.arg[0], 1);
1350                 tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
1351                 break;
1352         case 'C': /* CUF -- Cursor <n> Forward */
1353         case 'a':
1354                 DEFAULT(csiescseq.arg[0], 1);
1355                 tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
1356                 break;
1357         case 'D': /* CUB -- Cursor <n> Backward */
1358                 DEFAULT(csiescseq.arg[0], 1);
1359                 tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
1360                 break;
1361         case 'E': /* CNL -- Cursor <n> Down and first col */
1362                 DEFAULT(csiescseq.arg[0], 1);
1363                 tmoveto(0, term.c.y+csiescseq.arg[0]);
1364                 break;
1365         case 'F': /* CPL -- Cursor <n> Up and first col */
1366                 DEFAULT(csiescseq.arg[0], 1);
1367                 tmoveto(0, term.c.y-csiescseq.arg[0]);
1368                 break;
1369         case 'g': /* TBC -- Tabulation clear */
1370                 switch (csiescseq.arg[0]) {
1371                 case 0: /* clear current tab stop */
1372                         term.tabs[term.c.x] = 0;
1373                         break;
1374                 case 3: /* clear all the tabs */
1375                         memset(term.tabs, 0, term.col * sizeof(*term.tabs));
1376                         break;
1377                 default:
1378                         goto unknown;
1379                 }
1380                 break;
1381         case 'G': /* CHA -- Move to <col> */
1382         case '`': /* HPA */
1383                 DEFAULT(csiescseq.arg[0], 1);
1384                 tmoveto(csiescseq.arg[0]-1, term.c.y);
1385                 break;
1386         case 'H': /* CUP -- Move to <row> <col> */
1387         case 'f': /* HVP */
1388                 DEFAULT(csiescseq.arg[0], 1);
1389                 DEFAULT(csiescseq.arg[1], 1);
1390                 tmoveto(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
1391                 break;
1392         case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
1393                 DEFAULT(csiescseq.arg[0], 1);
1394                 while(csiescseq.arg[0]--)
1395                         tputtab(1);
1396                 break;
1397         case 'J': /* ED -- Clear screen */
1398                 sel.bx = -1;
1399                 switch(csiescseq.arg[0]) {
1400                 case 0: /* below */
1401                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1402                         if(term.c.y < term.row-1)
1403                                 tclearregion(0, term.c.y+1, term.col-1, term.row-1);
1404                         break;
1405                 case 1: /* above */
1406                         if(term.c.y > 1)
1407                                 tclearregion(0, 0, term.col-1, term.c.y-1);
1408                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1409                         break;
1410                 case 2: /* all */
1411                         tclearregion(0, 0, term.col-1, term.row-1);
1412                         break;
1413                 default:
1414                         goto unknown;
1415                 }
1416                 break;
1417         case 'K': /* EL -- Clear line */
1418                 switch(csiescseq.arg[0]) {
1419                 case 0: /* right */
1420                         tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
1421                         break;
1422                 case 1: /* left */
1423                         tclearregion(0, term.c.y, term.c.x, term.c.y);
1424                         break;
1425                 case 2: /* all */
1426                         tclearregion(0, term.c.y, term.col-1, term.c.y);
1427                         break;
1428                 }
1429                 break;
1430         case 'S': /* SU -- Scroll <n> line up */
1431                 DEFAULT(csiescseq.arg[0], 1);
1432                 tscrollup(term.top, csiescseq.arg[0]);
1433                 break;
1434         case 'T': /* SD -- Scroll <n> line down */
1435                 DEFAULT(csiescseq.arg[0], 1);
1436                 tscrolldown(term.top, csiescseq.arg[0]);
1437                 break;
1438         case 'L': /* IL -- Insert <n> blank lines */
1439                 DEFAULT(csiescseq.arg[0], 1);
1440                 tinsertblankline(csiescseq.arg[0]);
1441                 break;
1442         case 'l': /* RM -- Reset Mode */
1443                 tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
1444                 break;
1445         case 'M': /* DL -- Delete <n> lines */
1446                 DEFAULT(csiescseq.arg[0], 1);
1447                 tdeleteline(csiescseq.arg[0]);
1448                 break;
1449         case 'X': /* ECH -- Erase <n> char */
1450                 DEFAULT(csiescseq.arg[0], 1);
1451                 tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0], term.c.y);
1452                 break;
1453         case 'P': /* DCH -- Delete <n> char */
1454                 DEFAULT(csiescseq.arg[0], 1);
1455                 tdeletechar(csiescseq.arg[0]);
1456                 break;
1457         case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
1458                 DEFAULT(csiescseq.arg[0], 1);
1459                 while(csiescseq.arg[0]--)
1460                         tputtab(0);
1461                 break;
1462         case 'd': /* VPA -- Move to <row> */
1463                 DEFAULT(csiescseq.arg[0], 1);
1464                 tmoveto(term.c.x, csiescseq.arg[0]-1);
1465                 break;
1466         case 'h': /* SM -- Set terminal mode */
1467                 tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
1468                 break;
1469         case 'm': /* SGR -- Terminal attribute (color) */
1470                 tsetattr(csiescseq.arg, csiescseq.narg);
1471                 break;
1472         case 'r': /* DECSTBM -- Set Scrolling Region */
1473                 if(csiescseq.priv)
1474                         goto unknown;
1475                 else {
1476                         DEFAULT(csiescseq.arg[0], 1);
1477                         DEFAULT(csiescseq.arg[1], term.row);
1478                         tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
1479                         tmoveto(0, 0);
1480                 }
1481                 break;
1482         case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
1483                 tcursor(CURSOR_SAVE);
1484                 break;
1485         case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
1486                 tcursor(CURSOR_LOAD);
1487                 break;
1488         }
1489 }
1490
1491 void
1492 csidump(void) {
1493         int i;
1494         printf("ESC[");
1495         for(i = 0; i < csiescseq.len; i++) {
1496                 uint c = csiescseq.buf[i] & 0xff;
1497                 if(isprint(c)) putchar(c);
1498                 else if(c == '\n') printf("(\\n)");
1499                 else if(c == '\r') printf("(\\r)");
1500                 else if(c == 0x1b) printf("(\\e)");
1501                 else printf("(%02x)", c);
1502         }
1503         putchar('\n');
1504 }
1505
1506 void
1507 csireset(void) {
1508         memset(&csiescseq, 0, sizeof(csiescseq));
1509 }
1510
1511 void
1512 strhandle(void) {
1513         char *p;
1514
1515         /*
1516          * TODO: make this being useful in case of color palette change.
1517          */
1518         strparse();
1519
1520         p = strescseq.buf;
1521
1522         switch(strescseq.type) {
1523         case ']': /* OSC -- Operating System Command */
1524                 switch(p[0]) {
1525                 case '0':
1526                 case '1':
1527                 case '2':
1528                         /*
1529                          * TODO: Handle special chars in string, like umlauts.
1530                          */
1531                         if(p[1] == ';') {
1532                                 XStoreName(xw.dpy, xw.win, strescseq.buf+2);
1533                         }
1534                         break;
1535                 case ';':
1536                         XStoreName(xw.dpy, xw.win, strescseq.buf+1);
1537                         break;
1538                 case '4': /* TODO: Set color (arg0) to "rgb:%hexr/$hexg/$hexb" (arg1) */
1539                         break;
1540                 default:
1541                         fprintf(stderr, "erresc: unknown str ");
1542                         strdump();
1543                         break;
1544                 }
1545                 break;
1546         case 'k': /* old title set compatibility */
1547                 XStoreName(xw.dpy, xw.win, strescseq.buf);
1548                 break;
1549         case 'P': /* DSC -- Device Control String */
1550         case '_': /* APC -- Application Program Command */
1551         case '^': /* PM -- Privacy Message */
1552         default:
1553                 fprintf(stderr, "erresc: unknown str ");
1554                 strdump();
1555                 /* die(""); */
1556                 break;
1557         }
1558 }
1559
1560 void
1561 strparse(void) {
1562         /*
1563          * TODO: Implement parsing like for CSI when required.
1564          * Format: ESC type cmd ';' arg0 [';' argn] ESC \
1565          */
1566         return;
1567 }
1568
1569 void
1570 strdump(void) {
1571         int i;
1572         printf("ESC%c", strescseq.type);
1573         for(i = 0; i < strescseq.len; i++) {
1574                 uint c = strescseq.buf[i] & 0xff;
1575                 if(isprint(c)) putchar(c);
1576                 else if(c == '\n') printf("(\\n)");
1577                 else if(c == '\r') printf("(\\r)");
1578                 else if(c == 0x1b) printf("(\\e)");
1579                 else printf("(%02x)", c);
1580         }
1581         printf("ESC\\\n");
1582 }
1583
1584 void
1585 strreset(void) {
1586         memset(&strescseq, 0, sizeof(strescseq));
1587 }
1588
1589 void
1590 tputtab(bool forward) {
1591         unsigned x = term.c.x;
1592
1593         if(forward) {
1594                 if(x == term.col)
1595                         return;
1596                 for(++x; x < term.col && !term.tabs[x]; ++x)
1597                         /* nothing */ ;
1598         } else {
1599                 if(x == 0)
1600                         return;
1601                 for(--x; x > 0 && !term.tabs[x]; --x)
1602                         /* nothing */ ;
1603         }
1604         tmoveto(x, term.c.y);
1605 }
1606
1607 void
1608 tputc(char *c) {
1609         char ascii = *c;
1610
1611         if(iofd != -1)
1612                 write(iofd, c, 1);
1613
1614         if(term.esc & ESC_START) {
1615                 if(term.esc & ESC_CSI) {
1616                         csiescseq.buf[csiescseq.len++] = ascii;
1617                         if(BETWEEN(ascii, 0x40, 0x7E) || csiescseq.len >= ESC_BUF_SIZ) {
1618                                 term.esc = 0;
1619                                 csiparse(), csihandle();
1620                         }
1621                 } else if(term.esc & ESC_STR) {
1622                         switch(ascii) {
1623                         case '\033':
1624                                 term.esc = ESC_START | ESC_STR_END;
1625                                 break;
1626                         case '\a': /* backwards compatibility to xterm */
1627                                 term.esc = 0;
1628                                 strhandle();
1629                                 break;
1630                         default:
1631                                 strescseq.buf[strescseq.len++] = ascii;
1632                                 if(strescseq.len+1 >= STR_BUF_SIZ) {
1633                                         term.esc = 0;
1634                                         strhandle();
1635                                 }
1636                         }
1637                 } else if(term.esc & ESC_STR_END) {
1638                         term.esc = 0;
1639                         if(ascii == '\\')
1640                                 strhandle();
1641                 } else if(term.esc & ESC_ALTCHARSET) {
1642                         switch(ascii) {
1643                         case '0': /* Line drawing crap */
1644                                 term.c.attr.mode |= ATTR_GFX;
1645                                 break;
1646                         case 'B': /* Back to regular text */
1647                                 term.c.attr.mode &= ~ATTR_GFX;
1648                                 break;
1649                         default:
1650                                 fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
1651                         }
1652                         term.esc = 0;
1653                 } else {
1654                         switch(ascii) {
1655                         case '[':
1656                                 term.esc |= ESC_CSI;
1657                                 break;
1658                         case 'P': /* DCS -- Device Control String */
1659                         case '_': /* APC -- Application Program Command */
1660                         case '^': /* PM -- Privacy Message */
1661                         case ']': /* OSC -- Operating System Command */
1662                         case 'k': /* old title set compatibility */
1663                                 strreset();
1664                                 strescseq.type = ascii;
1665                                 term.esc |= ESC_STR;
1666                                 break;
1667                         case '(':
1668                                 term.esc |= ESC_ALTCHARSET;
1669                                 break;
1670                         case 'D': /* IND -- Linefeed */
1671                                 if(term.c.y == term.bot)
1672                                         tscrollup(term.top, 1);
1673                                 else
1674                                         tmoveto(term.c.x, term.c.y+1);
1675                                 term.esc = 0;
1676                                 break;
1677                         case 'E': /* NEL -- Next line */
1678                                 tnewline(1); /* always go to first col */
1679                                 term.esc = 0;
1680                                 break;
1681                         case 'H': /* HTS -- Horizontal tab stop */
1682                                 term.tabs[term.c.x] = 1;
1683                                 term.esc = 0;
1684                                 break;
1685                         case 'M': /* RI -- Reverse index */
1686                                 if(term.c.y == term.top)
1687                                         tscrolldown(term.top, 1);
1688                                 else
1689                                         tmoveto(term.c.x, term.c.y-1);
1690                                 term.esc = 0;
1691                                 break;
1692                         case 'c': /* RIS -- Reset to inital state */
1693                                 treset();
1694                                 term.esc = 0;
1695                                 xresettitle();
1696                                 break;
1697                         case '=': /* DECPAM -- Application keypad */
1698                                 term.mode |= MODE_APPKEYPAD;
1699                                 term.esc = 0;
1700                                 break;
1701                         case '>': /* DECPNM -- Normal keypad */
1702                                 term.mode &= ~MODE_APPKEYPAD;
1703                                 term.esc = 0;
1704                                 break;
1705                         case '7': /* DECSC -- Save Cursor */
1706                                 tcursor(CURSOR_SAVE);
1707                                 term.esc = 0;
1708                                 break;
1709                         case '8': /* DECRC -- Restore Cursor */
1710                                 tcursor(CURSOR_LOAD);
1711                                 term.esc = 0;
1712                                 break;
1713                         case '\\': /* ST -- Stop */
1714                                 term.esc = 0;
1715                                 break;
1716                         default:
1717                                 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
1718                                     (uchar) ascii, isprint(ascii)?ascii:'.');
1719                                 term.esc = 0;
1720                         }
1721                 }
1722         } else {
1723                 if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
1724                         sel.bx = -1;
1725                 switch(ascii) {
1726                 case '\0': /* padding character, do nothing */
1727                         break;
1728                 case '\t':
1729                         tputtab(1);
1730                         break;
1731                 case '\b':
1732                         tmoveto(term.c.x-1, term.c.y);
1733                         break;
1734                 case '\r':
1735                         tmoveto(0, term.c.y);
1736                         break;
1737                 case '\f':
1738                 case '\v':
1739                 case '\n':
1740                         /* go to first col if the mode is set */
1741                         tnewline(IS_SET(MODE_CRLF));
1742                         break;
1743                 case '\a':
1744                         if(!(xw.state & WIN_FOCUSED))
1745                                 xseturgency(1);
1746                         break;
1747                 case '\033':
1748                         csireset();
1749                         term.esc = ESC_START;
1750                         break;
1751                 default:
1752                         if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
1753                                 tnewline(1); /* always go to first col */
1754                         tsetchar(c);
1755                         if(term.c.x+1 < term.col)
1756                                 tmoveto(term.c.x+1, term.c.y);
1757                         else
1758                                 term.c.state |= CURSOR_WRAPNEXT;
1759                 }
1760         }
1761 }
1762
1763 int
1764 tresize(int col, int row) {
1765         int i, x;
1766         int minrow = MIN(row, term.row);
1767         int mincol = MIN(col, term.col);
1768         int slide = term.c.y - row + 1;
1769
1770         if(col < 1 || row < 1)
1771                 return 0;
1772
1773         /* free unneeded rows */
1774         i = 0;
1775         if(slide > 0) {
1776                 /* slide screen to keep cursor where we expect it -
1777                  * tscrollup would work here, but we can optimize to
1778                  * memmove because we're freeing the earlier lines */
1779                 for(/* i = 0 */; i < slide; i++) {
1780                         free(term.line[i]);
1781                         free(term.alt[i]);
1782                 }
1783                 memmove(term.line, term.line + slide, row * sizeof(Line));
1784                 memmove(term.alt, term.alt + slide, row * sizeof(Line));
1785         }
1786         for(i += row; i < term.row; i++) {
1787                 free(term.line[i]);
1788                 free(term.alt[i]);
1789         }
1790
1791         /* resize to new height */
1792         term.line = xrealloc(term.line, row * sizeof(Line));
1793         term.alt  = xrealloc(term.alt,  row * sizeof(Line));
1794         term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
1795         term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
1796
1797         /* resize each row to new width, zero-pad if needed */
1798         for(i = 0; i < minrow; i++) {
1799                 term.dirty[i] = 1;
1800                 term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
1801                 term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
1802                 for(x = mincol; x < col; x++) {
1803                         term.line[i][x].state = 0;
1804                         term.alt[i][x].state = 0;
1805                 }
1806         }
1807
1808         /* allocate any new rows */
1809         for(/* i == minrow */; i < row; i++) {
1810                 term.dirty[i] = 1;
1811                 term.line[i] = calloc(col, sizeof(Glyph));
1812                 term.alt [i] = calloc(col, sizeof(Glyph));
1813         }
1814         if(col > term.col) {
1815                 bool *bp = term.tabs + term.col;
1816
1817                 memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
1818                 while(--bp > term.tabs && !*bp)
1819                         /* nothing */ ;
1820                 for(bp += TAB; bp < term.tabs + col; bp += TAB)
1821                         *bp = 1;
1822         }
1823         /* update terminal size */
1824         term.col = col, term.row = row;
1825         /* make use of the LIMIT in tmoveto */
1826         tmoveto(term.c.x, term.c.y);
1827         /* reset scrolling region */
1828         tsetscroll(0, row-1);
1829
1830         return (slide > 0);
1831 }
1832
1833 void
1834 xresize(int col, int row) {
1835         xw.w = MAX(1, 2*BORDER + col * xw.cw);
1836         xw.h = MAX(1, 2*BORDER + row * xw.ch);
1837 }
1838
1839 void
1840 xloadcols(void) {
1841         int i, r, g, b;
1842         XColor color;
1843         ulong white = WhitePixel(xw.dpy, xw.scr);
1844
1845         /* load colors [0-15] colors and [256-LEN(colorname)[ (config.h) */
1846         for(i = 0; i < LEN(colorname); i++) {
1847                 if(!colorname[i])
1848                         continue;
1849                 if(!XAllocNamedColor(xw.dpy, xw.cmap, colorname[i], &color, &color)) {
1850                         dc.col[i] = white;
1851                         fprintf(stderr, "Could not allocate color '%s'\n", colorname[i]);
1852                 } else
1853                         dc.col[i] = color.pixel;
1854         }
1855
1856         /* load colors [16-255] ; same colors as xterm */
1857         for(i = 16, r = 0; r < 6; r++)
1858                 for(g = 0; g < 6; g++)
1859                         for(b = 0; b < 6; b++) {
1860                                 color.red = r == 0 ? 0 : 0x3737 + 0x2828 * r;
1861                                 color.green = g == 0 ? 0 : 0x3737 + 0x2828 * g;
1862                                 color.blue = b == 0 ? 0 : 0x3737 + 0x2828 * b;
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                                 i++;
1869                         }
1870
1871         for(r = 0; r < 24; r++, i++) {
1872                 color.red = color.green = color.blue = 0x0808 + 0x0a0a * r;
1873                 if(!XAllocColor(xw.dpy, xw.cmap, &color)) {
1874                         dc.col[i] = white;
1875                         fprintf(stderr, "Could not allocate color %d\n", i);
1876                 } else
1877                         dc.col[i] = color.pixel;
1878         }
1879 }
1880
1881 void
1882 xclear(int x1, int y1, int x2, int y2) {
1883         XSetForeground(xw.dpy, dc.gc, dc.col[IS_SET(MODE_REVERSE) ? DefaultFG : DefaultBG]);
1884         XFillRectangle(xw.dpy, xw.buf, dc.gc,
1885                        BORDER + x1 * xw.cw, BORDER + y1 * xw.ch,
1886                        (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1887 }
1888
1889 void
1890 xhints(void) {
1891         XClassHint class = {opt_class ? opt_class : TNAME, TNAME};
1892         XWMHints wm = {.flags = InputHint, .input = 1};
1893         XSizeHints *sizeh = NULL;
1894
1895         sizeh = XAllocSizeHints();
1896         if(xw.isfixed == False) {
1897                 sizeh->flags = PSize | PResizeInc | PBaseSize;
1898                 sizeh->height = xw.h;
1899                 sizeh->width = xw.w;
1900                 sizeh->height_inc = xw.ch;
1901                 sizeh->width_inc = xw.cw;
1902                 sizeh->base_height = 2*BORDER;
1903                 sizeh->base_width = 2*BORDER;
1904         } else {
1905                 sizeh->flags = PMaxSize | PMinSize;
1906                 sizeh->min_width = sizeh->max_width = xw.fw;
1907                 sizeh->min_height = sizeh->max_height = xw.fh;
1908         }
1909
1910         XSetWMProperties(xw.dpy, xw.win, NULL, NULL, NULL, 0, sizeh, &wm, &class);
1911         XFree(sizeh);
1912 }
1913
1914 XFontSet
1915 xinitfont(char *fontstr) {
1916         XFontSet set;
1917         char *def, **missing;
1918         int n;
1919
1920         missing = NULL;
1921         set = XCreateFontSet(xw.dpy, fontstr, &missing, &n, &def);
1922         if(missing) {
1923                 while(n--)
1924                         fprintf(stderr, "st: missing fontset: %s\n", missing[n]);
1925                 XFreeStringList(missing);
1926         }
1927         return set;
1928 }
1929
1930 void
1931 xgetfontinfo(XFontSet set, int *ascent, int *descent, short *lbearing, short *rbearing) {
1932         XFontStruct **xfonts;
1933         char **font_names;
1934         int i, n;
1935
1936         *ascent = *descent = *lbearing = *rbearing = 0;
1937         n = XFontsOfFontSet(set, &xfonts, &font_names);
1938         for(i = 0; i < n; i++) {
1939                 *ascent = MAX(*ascent, (*xfonts)->ascent);
1940                 *descent = MAX(*descent, (*xfonts)->descent);
1941                 *lbearing = MAX(*lbearing, (*xfonts)->min_bounds.lbearing);
1942                 *rbearing = MAX(*rbearing, (*xfonts)->max_bounds.rbearing);
1943                 xfonts++;
1944         }
1945 }
1946
1947 void
1948 initfonts(char *fontstr, char *bfontstr, char *ifontstr, char *ibfontstr) {
1949         if((dc.font.set = xinitfont(fontstr)) == NULL)
1950                 die("Can't load font %s\n", fontstr);
1951         if((dc.bfont.set = xinitfont(bfontstr)) == NULL)
1952                 die("Can't load bfont %s\n", bfontstr);
1953         if((dc.ifont.set = xinitfont(ifontstr)) == NULL)
1954                 die("Can't load ifont %s\n", ifontstr);
1955         if((dc.ibfont.set = xinitfont(ibfontstr)) == NULL)
1956                 die("Can't load ibfont %s\n", ibfontstr);
1957
1958         xgetfontinfo(dc.font.set, &dc.font.ascent, &dc.font.descent,
1959             &dc.font.lbearing, &dc.font.rbearing);
1960         xgetfontinfo(dc.bfont.set, &dc.bfont.ascent, &dc.bfont.descent,
1961             &dc.bfont.lbearing, &dc.bfont.rbearing);
1962         xgetfontinfo(dc.ifont.set, &dc.ifont.ascent, &dc.ifont.descent,
1963             &dc.ifont.lbearing, &dc.ifont.rbearing);
1964         xgetfontinfo(dc.ibfont.set, &dc.ibfont.ascent, &dc.ibfont.descent,
1965             &dc.ibfont.lbearing, &dc.ibfont.rbearing);
1966 }
1967
1968 void
1969 xinit(void) {
1970         XSetWindowAttributes attrs;
1971         Cursor cursor;
1972         Window parent;
1973         int sw, sh;
1974
1975         if(!(xw.dpy = XOpenDisplay(NULL)))
1976                 die("Can't open display\n");
1977         xw.scr = XDefaultScreen(xw.dpy);
1978
1979         /* font */
1980         initfonts(FONT, BOLDFONT, ITALICFONT, ITALICBOLDFONT);
1981
1982         /* XXX: Assuming same size for bold font */
1983         xw.cw = dc.font.rbearing - dc.font.lbearing;
1984         xw.ch = dc.font.ascent + dc.font.descent;
1985
1986         /* colors */
1987         xw.cmap = XDefaultColormap(xw.dpy, xw.scr);
1988         xloadcols();
1989
1990         /* adjust fixed window geometry */
1991         if(xw.isfixed) {
1992                 sw = DisplayWidth(xw.dpy, xw.scr);
1993                 sh = DisplayHeight(xw.dpy, xw.scr);
1994                 if(xw.fx < 0)
1995                         xw.fx = sw + xw.fx - xw.fw - 1;
1996                 if(xw.fy < 0)
1997                         xw.fy = sh + xw.fy - xw.fh - 1;
1998
1999                 xw.h = xw.fh;
2000                 xw.w = xw.fw;
2001         } else {
2002                 /* window - default size */
2003                 xw.h = 2*BORDER + term.row * xw.ch;
2004                 xw.w = 2*BORDER + term.col * xw.cw;
2005                 xw.fx = 0;
2006                 xw.fy = 0;
2007         }
2008
2009         attrs.background_pixel = dc.col[DefaultBG];
2010         attrs.border_pixel = dc.col[DefaultBG];
2011         attrs.bit_gravity = NorthWestGravity;
2012         attrs.event_mask = FocusChangeMask | KeyPressMask
2013                 | ExposureMask | VisibilityChangeMask | StructureNotifyMask
2014                 | ButtonMotionMask | ButtonPressMask | ButtonReleaseMask;
2015         attrs.colormap = xw.cmap;
2016
2017         parent = opt_embed ? strtol(opt_embed, NULL, 0) : XRootWindow(xw.dpy, xw.scr);
2018         xw.win = XCreateWindow(xw.dpy, parent, xw.fx, xw.fy,
2019                         xw.w, xw.h, 0, XDefaultDepth(xw.dpy, xw.scr), InputOutput,
2020                         XDefaultVisual(xw.dpy, xw.scr),
2021                         CWBackPixel | CWBorderPixel | CWBitGravity | CWEventMask
2022                         | CWColormap,
2023                         &attrs);
2024         xw.buf = XdbeAllocateBackBufferName(xw.dpy, xw.win, XdbeCopied);
2025
2026
2027         /* input methods */
2028         xw.xim = XOpenIM(xw.dpy, NULL, NULL, NULL);
2029         xw.xic = XCreateIC(xw.xim, XNInputStyle, XIMPreeditNothing
2030                                            | XIMStatusNothing, XNClientWindow, xw.win,
2031                                            XNFocusWindow, xw.win, NULL);
2032         /* gc */
2033         dc.gc = XCreateGC(xw.dpy, xw.win, 0, NULL);
2034
2035         /* white cursor, black outline */
2036         cursor = XCreateFontCursor(xw.dpy, XC_xterm);
2037         XDefineCursor(xw.dpy, xw.win, cursor);
2038         XRecolorCursor(xw.dpy, cursor,
2039                 &(XColor){.red = 0xffff, .green = 0xffff, .blue = 0xffff},
2040                 &(XColor){.red = 0x0000, .green = 0x0000, .blue = 0x0000});
2041
2042         xw.xembed = XInternAtom(xw.dpy, "_XEMBED", False);
2043
2044         xresettitle();
2045         XMapWindow(xw.dpy, xw.win);
2046         xhints();
2047         XSync(xw.dpy, 0);
2048 }
2049
2050 void
2051 xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
2052         int fg = base.fg, bg = base.bg, temp;
2053         int winx = BORDER+x*xw.cw, winy = BORDER+y*xw.ch + dc.font.ascent, width = charlen*xw.cw;
2054         XFontSet fontset = dc.font.set;
2055         int i;
2056
2057         /* only switch default fg/bg if term is in RV mode */
2058         if(IS_SET(MODE_REVERSE)) {
2059                 if(fg == DefaultFG)
2060                         fg = DefaultBG;
2061                 if(bg == DefaultBG)
2062                         bg = DefaultFG;
2063         }
2064
2065         if(base.mode & ATTR_REVERSE)
2066                 temp = fg, fg = bg, bg = temp;
2067
2068         if(base.mode & ATTR_BOLD) {
2069                 fg += 8;
2070                 fontset = dc.bfont.set;
2071         }
2072
2073         if(base.mode & ATTR_ITALIC)
2074                 fontset = dc.ifont.set;
2075         if(base.mode & (ATTR_ITALIC|ATTR_ITALIC))
2076                 fontset = dc.ibfont.set;
2077
2078         XSetBackground(xw.dpy, dc.gc, dc.col[bg]);
2079         XSetForeground(xw.dpy, dc.gc, dc.col[fg]);
2080
2081         if(base.mode & ATTR_GFX) {
2082                 for(i = 0; i < bytelen; i++) {
2083                         char c = gfx[(uint)s[i] % 256];
2084                         if(c)
2085                                 s[i] = c;
2086                         else if(s[i] > 0x5f)
2087                                 s[i] -= 0x5f;
2088                 }
2089         }
2090
2091         XmbDrawImageString(xw.dpy, xw.buf, fontset, dc.gc, winx, winy, s, bytelen);
2092
2093         if(base.mode & ATTR_UNDERLINE)
2094                 XDrawLine(xw.dpy, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
2095 }
2096
2097 /* copy buffer pixmap to screen pixmap */
2098 void
2099 xcopy() {
2100         XdbeSwapInfo swpinfo[1] = {{xw.win, XdbeCopied}};
2101         XdbeSwapBuffers(xw.dpy, swpinfo, 1);
2102 }
2103
2104 void
2105 xdrawcursor(void) {
2106         static int oldx = 0;
2107         static int oldy = 0;
2108         int sl;
2109         Glyph g = {{' '}, ATTR_NULL, DefaultBG, DefaultCS, 0};
2110
2111         LIMIT(oldx, 0, term.col-1);
2112         LIMIT(oldy, 0, term.row-1);
2113
2114         if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
2115                 memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
2116
2117         /* remove the old cursor */
2118         if(term.line[oldy][oldx].state & GLYPH_SET) {
2119                 sl = utf8size(term.line[oldy][oldx].c);
2120                 xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1, sl);
2121         } else
2122                 xclear(oldx, oldy, oldx, oldy);
2123
2124         xcopy();
2125
2126         /* draw the new one */
2127         if(!(term.c.state & CURSOR_HIDE)) {
2128                 if(!(xw.state & WIN_FOCUSED))
2129                         g.bg = DefaultUCS;
2130
2131                 if(IS_SET(MODE_REVERSE))
2132                         g.mode |= ATTR_REVERSE, g.fg = DefaultCS, g.bg = DefaultFG;
2133
2134                 sl = utf8size(g.c);
2135                 xdraws(g.c, g, term.c.x, term.c.y, 1, sl);
2136                 oldx = term.c.x, oldy = term.c.y;
2137         }
2138
2139         xcopy();
2140 }
2141
2142 void
2143 xresettitle(void) {
2144         XStoreName(xw.dpy, xw.win, opt_title ? opt_title : "st");
2145 }
2146
2147 void
2148 redraw(void) {
2149         struct timespec tv = {0, REDRAW_TIMEOUT * 1000};
2150         tfulldirt();
2151         draw();
2152         nanosleep(&tv, NULL);
2153 }
2154
2155 void
2156 draw() {
2157         drawregion(0, 0, term.col, term.row);
2158         xcopy();
2159         gettimeofday(&xw.lastdraw, NULL);
2160 }
2161
2162 void
2163 drawregion(int x1, int y1, int x2, int y2) {
2164         int ic, ib, x, y, ox, sl;
2165         Glyph base, new;
2166         char buf[DRAW_BUF_SIZ];
2167         bool ena_sel = sel.bx != -1, alt = IS_SET(MODE_ALTSCREEN);
2168
2169         if((sel.alt && !alt) || (!sel.alt && alt))
2170                 ena_sel = 0;
2171         if(!(xw.state & WIN_VISIBLE))
2172                 return;
2173
2174         for(y = y1; y < y2; y++) {
2175                 if(!term.dirty[y])
2176                         continue;
2177                 xclear(0, y, term.col, y);
2178                 term.dirty[y] = 0;
2179                 base = term.line[y][0];
2180                 ic = ib = ox = 0;
2181                 for(x = x1; x < x2; x++) {
2182                         new = term.line[y][x];
2183                         if(ena_sel && *(new.c) && selected(x, y))
2184                                 new.mode ^= ATTR_REVERSE;
2185                         if(ib > 0 && (!(new.state & GLYPH_SET) || ATTRCMP(base, new) ||
2186                                                   ib >= DRAW_BUF_SIZ-UTF_SIZ)) {
2187                                 xdraws(buf, base, ox, y, ic, ib);
2188                                 ic = ib = 0;
2189                         }
2190                         if(new.state & GLYPH_SET) {
2191                                 if(ib == 0) {
2192                                         ox = x;
2193                                         base = new;
2194                                 }
2195                                 sl = utf8size(new.c);
2196                                 memcpy(buf+ib, new.c, sl);
2197                                 ib += sl;
2198                                 ++ic;
2199                         }
2200                 }
2201                 if(ib > 0)
2202                         xdraws(buf, base, ox, y, ic, ib);
2203         }
2204         xdrawcursor();
2205 }
2206
2207 void
2208 expose(XEvent *ev) {
2209         XExposeEvent *e = &ev->xexpose;
2210         if(xw.state & WIN_REDRAW) {
2211                 if(!e->count)
2212                         xw.state &= ~WIN_REDRAW;
2213         }
2214         xcopy();
2215 }
2216
2217 void
2218 visibility(XEvent *ev) {
2219         XVisibilityEvent *e = &ev->xvisibility;
2220         if(e->state == VisibilityFullyObscured)
2221                 xw.state &= ~WIN_VISIBLE;
2222         else if(!(xw.state & WIN_VISIBLE))
2223                 /* need a full redraw for next Expose, not just a buf copy */
2224                 xw.state |= WIN_VISIBLE | WIN_REDRAW;
2225 }
2226
2227 void
2228 unmap(XEvent *ev) {
2229         xw.state &= ~WIN_VISIBLE;
2230 }
2231
2232 void
2233 xseturgency(int add) {
2234         XWMHints *h = XGetWMHints(xw.dpy, xw.win);
2235         h->flags = add ? (h->flags | XUrgencyHint) : (h->flags & ~XUrgencyHint);
2236         XSetWMHints(xw.dpy, xw.win, h);
2237         XFree(h);
2238 }
2239
2240 void
2241 focus(XEvent *ev) {
2242         if(ev->type == FocusIn) {
2243                 xw.state |= WIN_FOCUSED;
2244                 xseturgency(0);
2245         } else
2246                 xw.state &= ~WIN_FOCUSED;
2247         draw();
2248 }
2249
2250 char*
2251 kmap(KeySym k, uint state) {
2252         int i;
2253         state &= ~Mod2Mask;
2254         for(i = 0; i < LEN(key); i++) {
2255                 uint mask = key[i].mask;
2256                 if(key[i].k == k && ((state & mask) == mask || (mask == XK_NO_MOD && !state)))
2257                         return (char*)key[i].s;
2258         }
2259         return NULL;
2260 }
2261
2262 void
2263 kpress(XEvent *ev) {
2264         XKeyEvent *e = &ev->xkey;
2265         KeySym ksym;
2266         char buf[32];
2267         char *customkey;
2268         int len;
2269         int meta;
2270         int shift;
2271         Status status;
2272
2273         meta = e->state & Mod1Mask;
2274         shift = e->state & ShiftMask;
2275         len = XmbLookupString(xw.xic, e, buf, sizeof(buf), &ksym, &status);
2276
2277         /* 1. custom keys from config.h */
2278         if((customkey = kmap(ksym, e->state)))
2279                 ttywrite(customkey, strlen(customkey));
2280         /* 2. hardcoded (overrides X lookup) */
2281         else
2282                 switch(ksym) {
2283                 case XK_Up:
2284                 case XK_Down:
2285                 case XK_Left:
2286                 case XK_Right:
2287                         /* XXX: shift up/down doesn't work */
2288                         sprintf(buf, "\033%c%c", IS_SET(MODE_APPKEYPAD) ? 'O' : '[', (shift ? "dacb":"DACB")[ksym - XK_Left]);
2289                         ttywrite(buf, 3);
2290                         break;
2291                 case XK_Insert:
2292                         if(shift)
2293                                 selpaste();
2294                         break;
2295                 case XK_Return:
2296                         if(IS_SET(MODE_CRLF))
2297                                 ttywrite("\r\n", 2);
2298                         else
2299                                 ttywrite("\r", 1);
2300                         break;
2301                         /* 3. X lookup  */
2302                 default:
2303                         if(len > 0) {
2304                                 if(meta && len == 1)
2305                                         ttywrite("\033", 1);
2306                                 ttywrite(buf, len);
2307                         }
2308                         break;
2309                 }
2310 }
2311
2312 void
2313 cmessage(XEvent *e) {
2314         /* See xembed specs
2315            http://standards.freedesktop.org/xembed-spec/xembed-spec-latest.html */
2316         if(e->xclient.message_type == xw.xembed && e->xclient.format == 32) {
2317                 if(e->xclient.data.l[1] == XEMBED_FOCUS_IN) {
2318                         xw.state |= WIN_FOCUSED;
2319                         xseturgency(0);
2320                 } else if(e->xclient.data.l[1] == XEMBED_FOCUS_OUT) {
2321                         xw.state &= ~WIN_FOCUSED;
2322                 }
2323                 draw();
2324         }
2325 }
2326
2327 void
2328 resize(XEvent *e) {
2329         int col, row;
2330
2331         if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
2332                 return;
2333
2334         xw.w = e->xconfigure.width;
2335         xw.h = e->xconfigure.height;
2336         col = (xw.w - 2*BORDER) / xw.cw;
2337         row = (xw.h - 2*BORDER) / xw.ch;
2338         if(col == term.col && row == term.row)
2339                 return;
2340         if(tresize(col, row))
2341                 draw();
2342         xresize(col, row);
2343         ttyresize(col, row);
2344 }
2345
2346 bool
2347 last_draw_too_old(void) {
2348         struct timeval now;
2349         gettimeofday(&now, NULL);
2350         return TIMEDIFF(now, xw.lastdraw) >= DRAW_TIMEOUT/1000;
2351 }
2352
2353 void
2354 run(void) {
2355         XEvent ev;
2356         fd_set rfd;
2357         int xfd = XConnectionNumber(xw.dpy);
2358         struct timeval timeout = {0};
2359         bool stuff_to_print = 0;
2360
2361         for(;;) {
2362                 FD_ZERO(&rfd);
2363                 FD_SET(cmdfd, &rfd);
2364                 FD_SET(xfd, &rfd);
2365                 timeout.tv_sec  = 0;
2366                 timeout.tv_usec = SELECT_TIMEOUT;
2367                 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, &timeout) < 0) {
2368                         if(errno == EINTR)
2369                                 continue;
2370                         die("select failed: %s\n", SERRNO);
2371                 }
2372                 if(FD_ISSET(cmdfd, &rfd)) {
2373                         ttyread();
2374                         stuff_to_print = 1;
2375                 }
2376
2377                 if(stuff_to_print && last_draw_too_old()) {
2378                         stuff_to_print = 0;
2379                         draw();
2380                 }
2381
2382                 while(XPending(xw.dpy)) {
2383                         XNextEvent(xw.dpy, &ev);
2384                         if(XFilterEvent(&ev, xw.win))
2385                                 continue;
2386                         if(handler[ev.type])
2387                                 (handler[ev.type])(&ev);
2388                 }
2389         }
2390 }
2391
2392 int
2393 main(int argc, char *argv[]) {
2394         int i, bitm, xr, yr;
2395         unsigned int wr, hr;
2396
2397         xw.fw = xw.fh = xw.fx = xw.fy = 0;
2398         xw.isfixed = False;
2399
2400         for(i = 1; i < argc; i++) {
2401                 switch(argv[i][0] != '-' || argv[i][2] ? -1 : argv[i][1]) {
2402                 case 't':
2403                         if(++i < argc) opt_title = argv[i];
2404                         break;
2405                 case 'c':
2406                         if(++i < argc) opt_class = argv[i];
2407                         break;
2408                 case 'w':
2409                         if(++i < argc) opt_embed = argv[i];
2410                         break;
2411                 case 'f':
2412                         if(++i < argc) opt_io = argv[i];
2413                         break;
2414                 case 'e':
2415                         /* eat every remaining arguments */
2416                         if(++i < argc) opt_cmd = &argv[i];
2417                         goto run;
2418                 case 'g':
2419                         if(++i >= argc)
2420                                 break;
2421
2422                         bitm = XParseGeometry(argv[i], &xr, &yr, &wr, &hr);
2423                         if(bitm & XValue)
2424                                 xw.fx = xr;
2425                         if(bitm & YValue)
2426                                 xw.fy = yr;
2427                         if(bitm & WidthValue)
2428                                 xw.fw = (int)wr;
2429                         if(bitm & HeightValue)
2430                                 xw.fh = (int)hr;
2431                         if(bitm & XNegative && xw.fx == 0)
2432                                 xw.fx = -1;
2433                         if(bitm & XNegative && xw.fy == 0)
2434                                 xw.fy = -1;
2435
2436                         if(xw.fh != 0 && xw.fw != 0)
2437                                 xw.isfixed = True;
2438                         break;
2439                 case 'v':
2440                 default:
2441                         die(USAGE);
2442                 }
2443         }
2444
2445  run:
2446         setlocale(LC_CTYPE, "");
2447         tnew(80, 24);
2448         ttynew();
2449         xinit();
2450         selinit();
2451         run();
2452         return 0;
2453 }
2454