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