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