contrib/nvi/tk/tk_main.c

   1 /*-
   2  * Copyright (c) 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 static const char sccsid[] = "@(#)tk_main.c     8.18 (Berkeley) 9/24/96";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18
  19 #include <bitstring.h>
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <signal.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <termios.h>
  27 #include <unistd.h>
  28
  29 #include "../common/common.h"
  30 #include "tki.h"
  31 #include "pathnames.h"
  32
  33 GS *__global_list;                              /* GLOBAL: List of screens. */
  34 sigset_t __sigblockset;                         /* GLOBAL: Blocked signals. */
  35
  36 static GS       *gs_init __P((char *));
  37 static void      killsig __P((SCR *));
  38 static void      perr __P((char *, char *));
  39 static void      sig_end __P((GS *));
  40 static int       sig_init __P((GS *));
  41 static int       tcl_init __P((GS *));
  42 static void      tcl_err __P((TK_PRIVATE *));
  43
  44 /*
  45  * main --
  46  *      This is the main loop for the standalone Tcl/Tk editor.
  47  */
  48 int
  49 main(argc, argv)
  50         int argc;
  51         char *argv[];
  52 {
  53         static int reenter;
  54         GS *gp;
  55         TK_PRIVATE *tkp;
  56         size_t rows, cols;
  57         int rval;
  58         char **p_av, **t_av, *script;
  59
  60         /* If loaded at 0 and jumping through a NULL pointer, stop. */
  61         if (reenter++)
  62                 abort();
  63
  64         /* Create and initialize the global structure. */
  65         __global_list = gp = gs_init(argv[0]);
  66
  67         /* Initialize Tk/Tcl. */
  68         if (tcl_init(gp))
  69                 exit (1);
  70
  71         /*
  72          * Strip out any arguments that the common editor doesn't understand
  73          * (i.e. the Tk/Tcl arguments).  Search for -i first, it's the Tk/Tcl
  74          * startup script and needs to be run first.
  75          *
  76          * XXX
  77          * There's no way to portably call getopt twice.
  78          */
  79         script = "init.tcl";
  80         for (p_av = t_av = argv;;) {
  81                 if (*t_av == NULL) {
  82                         *p_av = NULL;
  83                         break;
  84                 }
  85                 if (!strcmp(*t_av, "--")) {
  86                         while ((*p_av++ = *t_av++) != NULL);
  87                         break;
  88                 }
  89                 if (!memcmp(*t_av, "-i", sizeof("-i") - 1)) {
  90                         if (t_av[0][2] != '\0') {
  91                                 script = t_av[0] + 2;
  92                                 ++t_av;
  93                                 --argc;
  94                                 continue;
  95                         }
  96                         if (t_av[1] != NULL) {
  97                                 script = t_av[1];
  98                                 t_av += 2;
  99                                 argc -= 2;
 100                                 continue;
 101                         }
 102                 }
 103                 *p_av++ = *t_av++;
 104         }
 105         for (p_av = t_av = argv;;) {
 106                 if (*t_av == NULL) {
 107                         *p_av = NULL;
 108                         break;
 109                 }
 110                 if (!strcmp(*t_av, "--")) {
 111                         while ((*p_av++ = *t_av++) != NULL);
 112                         break;
 113                 }
 114                 if (t_av[1] != NULL &&
 115                    (!memcmp(*t_av, "-background", sizeof("-background") - 1) ||
 116                     !memcmp(*t_av, "-bg", sizeof("-bg") - 1) ||
 117                     !memcmp(*t_av, "-borderwidth", sizeof("-borderwidth") - 1)||
 118                     !memcmp(*t_av, "-bd", sizeof("-bd") - 1) ||
 119                     !memcmp(*t_av, "-foreground", sizeof("-foreground") - 1) ||
 120                     !memcmp(*t_av, "-fg", sizeof("-fg") - 1) ||
 121                     !memcmp(*t_av, "-font", sizeof("-font") - 1))) {
 122                         if (Tcl_VarEval(tkp->interp, ".t configure ",
 123                             t_av[0], " ", t_av[1], NULL) == TCL_ERROR)
 124                                 tcl_err(tkp);
 125                         t_av += 2;
 126                         argc -= 2;
 127                         continue;
 128                 }
 129                 if (!memcmp(*t_av, "-geometry", sizeof("-geometry") - 1)) {
 130                         if (Tcl_VarEval(tkp->interp, "wm geometry . ",
 131                             *t_av + sizeof("-geometry") - 1, NULL) == TCL_ERROR)
 132                                 tcl_err(tkp);
 133                         ++t_av;
 134                         --argc;
 135                         continue;
 136                 }
 137                 *p_av++ = *t_av++;
 138         }
 139
 140         /* Load the initial Tcl/Tk script. */
 141         tkp = GTKP(gp);
 142         if (Tcl_EvalFile(tkp->interp, script) == TCL_ERROR)
 143                 tcl_err(tkp);
 144
 145         /* Add the terminal type to the global structure. */
 146         if ((OG_D_STR(gp, GO_TERM) =
 147             OG_STR(gp, GO_TERM) = strdup("tkterm")) == NULL)
 148                 perr(gp->progname, NULL);
 149
 150         /* Figure out how big the screen is. */
 151         if (tk_ssize(NULL, 0, &rows, &cols, NULL))
 152                 exit (1);
 153
 154         /* Add the rows and columns to the global structure. */
 155         OG_VAL(gp, GO_LINES) = OG_D_VAL(gp, GO_LINES) = rows;
 156         OG_VAL(gp, GO_COLUMNS) = OG_D_VAL(gp, GO_COLUMNS) = cols;
 157
 158         /* Start catching signals. */
 159         if (sig_init(gp))
 160                 exit (1);
 161
 162         /* Run ex/vi. */
 163         rval = editor(gp, argc, argv);
 164
 165         /* Clean up signals. */
 166         sig_end(gp);
 167
 168         /* Clean up the terminal. */
 169         (void)tk_quit(gp);
 170
 171         /* If a killer signal arrived, pretend we just got it. */
 172         if (tkp->killersig) {
 173                 (void)signal(tkp->killersig, SIG_DFL);
 174                 (void)kill(getpid(), tkp->killersig);
 175                 /* NOTREACHED */
 176         }
 177
 178         /* Free the global and TK private areas. */
 179 #if defined(DEBUG) || defined(PURIFY) || defined(LIBRARY)
 180         free(tkp);
 181         free(gp);
 182 #endif
 183
 184         exit (rval);
 185 }
 186
 187 /*
 188  * gs_init --
 189  *      Create and partially initialize the GS structure.
 190  */
 191 static GS *
 192 gs_init(name)
 193         char *name;
 194 {
 195         TK_PRIVATE *tkp;
 196         GS *gp;
 197         int fd;
 198         char *p;
 199
 200         /* Figure out what our name is. */
 201         if ((p = strrchr(name, '/')) != NULL)
 202                 name = p + 1;
 203
 204         /* Allocate the global structure. */
 205         CALLOC_NOMSG(NULL, gp, GS *, 1, sizeof(GS));
 206
 207         /* Allocate the CL private structure. */
 208         if (gp != NULL)
 209                 CALLOC_NOMSG(NULL, tkp, TK_PRIVATE *, 1, sizeof(TK_PRIVATE));
 210         if (gp == NULL || tkp == NULL)
 211                 perr(name, NULL);
 212         gp->tk_private = tkp;
 213         TAILQ_INIT(&tkp->evq);
 214
 215         /* Initialize the list of curses functions. */
 216         gp->scr_addstr = tk_addstr;
 217         gp->scr_attr = tk_attr;
 218         gp->scr_baud = tk_baud;
 219         gp->scr_bell = tk_bell;
 220         gp->scr_busy = NULL;
 221         gp->scr_clrtoeol = tk_clrtoeol;
 222         gp->scr_cursor = tk_cursor;
 223         gp->scr_deleteln = tk_deleteln;
 224         gp->scr_event = tk_event;
 225         gp->scr_ex_adjust = tk_ex_adjust;
 226         gp->scr_fmap = tk_fmap;
 227         gp->scr_insertln = tk_insertln;
 228         gp->scr_keyval = tk_keyval;
 229         gp->scr_move = tk_move;
 230         gp->scr_msg = NULL;
 231         gp->scr_optchange = tk_optchange;
 232         gp->scr_refresh = tk_refresh;
 233         gp->scr_rename = tk_rename;
 234         gp->scr_screen = tk_screen;
 235         gp->scr_suspend = tk_suspend;
 236         gp->scr_usage = tk_usage;
 237
 238         /*
 239          * We expect that if we've lost our controlling terminal that the
 240          * open() (but not the tcgetattr()) will fail.
 241          */
 242         if (isatty(STDIN_FILENO)) {
 243                 if (tcgetattr(STDIN_FILENO, &tkp->orig) == -1)
 244                         goto tcfail;
 245         } else if ((fd = open(_PATH_TTY, O_RDONLY, 0)) != -1) {
 246                 if (tcgetattr(fd, &tkp->orig) == -1)
 247 tcfail:                 perr(name, "tcgetattr");
 248                 (void)close(fd);
 249         }
 250
 251         gp->progname = name;
 252         return (gp);
 253 }
 254
 255 /*
 256  *  tcl_init --
 257  *      Get Tcl/Tk up and running.
 258  */
 259 static int
 260 tcl_init(gp)
 261         GS *gp;
 262 {
 263         TK_PRIVATE *tkp;
 264
 265         tkp = GTKP(gp);
 266         if ((tkp->interp = Tcl_CreateInterp()) == NULL)
 267                 tcl_err(tkp);
 268         /* XXX: Tk 4.1 has an incompatible change. */
 269 #if (TK_MAJOR_VERSION == 4) && (TK_MINOR_VERSION == 0)
 270         if (Tk_CreateMainWindow(tkp->interp, NULL, "vi", "Vi") == NULL)
 271                 tcl_err(tkp);
 272 #endif
 273         if (Tcl_Init(tkp->interp) == TCL_ERROR)
 274                 tcl_err(tkp);
 275         if (Tk_Init(tkp->interp) == TCL_ERROR)
 276                 tcl_err(tkp);
 277
 278         /* Shared variables. */
 279         (void)Tcl_LinkVar(tkp->interp,
 280             "tk_cursor_row", (char *)&tkp->tk_cursor_row, TCL_LINK_INT);
 281         (void)Tcl_LinkVar(tkp->interp,
 282             "tk_cursor_col", (char *)&tkp->tk_cursor_col, TCL_LINK_INT);
 283         (void)Tcl_LinkVar(tkp->interp,
 284             "tk_ssize_row", (char *)&tkp->tk_ssize_row, TCL_LINK_INT);
 285         (void)Tcl_LinkVar(tkp->interp,
 286             "tk_ssize_col", (char *)&tkp->tk_ssize_col, TCL_LINK_INT);
 287
 288         /* Functions called by Tcl script. */
 289         Tcl_CreateCommand(tkp->interp, "tk_key", tk_key, tkp, NULL);
 290         Tcl_CreateCommand(tkp->interp, "tk_op", tk_op, tkp, NULL);
 291         Tcl_CreateCommand(tkp->interp, "tk_opt_init", tk_opt_init, tkp, NULL);
 292         Tcl_CreateCommand(tkp->interp, "tk_opt_set", tk_opt_set, tkp, NULL);
 293         Tcl_CreateCommand(tkp->interp, "tk_version", tk_version, tkp, NULL);
 294
 295         /* Other initialization. */
 296         if (Tcl_Eval(tkp->interp, "wm geometry . =80x28+0+0") == TCL_ERROR)
 297                 tcl_err(tkp);
 298         return (0);
 299 }
 300
 301 /*
 302  * tcl_err --
 303  *      Tcl/Tk error message during initialization.
 304  */
 305 static void
 306 tcl_err(tkp)
 307         TK_PRIVATE *tkp;
 308 {
 309         (void)fprintf(stderr, "%s\n", tkp->interp->result != NULL ?
 310             tkp->interp->result : "Tcl/Tk: initialization error");
 311         (void)tk_usage();
 312         exit (1);
 313 }
 314
 315 #define GLOBAL_TKP \
 316         TK_PRIVATE *tkp = GTKP(__global_list);
 317 static void
 318 h_hup(signo)
 319         int signo;
 320 {
 321         GLOBAL_TKP;
 322
 323         F_SET(tkp, TK_SIGHUP);
 324         tkp->killersig = SIGHUP;
 325 }
 326
 327 static void
 328 h_int(signo)
 329         int signo;
 330 {
 331         GLOBAL_TKP;
 332
 333         F_SET(tkp, TK_SIGINT);
 334 }
 335
 336 static void
 337 h_term(signo)
 338         int signo;
 339 {
 340         GLOBAL_TKP;
 341
 342         F_SET(tkp, TK_SIGTERM);
 343         tkp->killersig = SIGTERM;
 344 }
 345
 346 static void
 347 h_winch(signo)
 348         int signo;
 349 {
 350         GLOBAL_TKP;
 351
 352         F_SET(tkp, TK_SIGWINCH);
 353 }
 354 #undef  GLOBAL_TKP
 355
 356 /*
 357  * sig_init --
 358  *      Initialize signals.
 359  */
 360 static int
 361 sig_init(gp)
 362         GS *gp;
 363 {
 364         TK_PRIVATE *tkp;
 365         struct sigaction act;
 366
 367         tkp = GTKP(gp);
 368
 369         (void)sigemptyset(&__sigblockset);
 370
 371         /*
 372          * Use sigaction(2), not signal(3), since we don't always want to
 373          * restart system calls.  The example is when waiting for a command
 374          * mode keystroke and SIGWINCH arrives.  Besides, you can't portably
 375          * restart system calls (thanks, POSIX!).
 376          */
 377 #define SETSIG(signal, handler, off) {                                  \
 378         if (sigaddset(&__sigblockset, signal))                          \
 379                 goto err;                                               \
 380         act.sa_handler = handler;                                       \
 381         sigemptyset(&act.sa_mask);                                      \
 382         act.sa_flags = 0;                                               \
 383         if (sigaction(signal, &act, &tkp->oact[off]))                   \
 384                 goto err;                                               \
 385 }
 386 #undef SETSIG
 387         return (0);
 388
 389 err:    perr(gp->progname, NULL);
 390         return (1);
 391 }
 392
 393 /*
 394  * sig_end --
 395  *      End signal setup.
 396  */
 397 static void
 398 sig_end(gp)
 399         GS *gp;
 400 {
 401         TK_PRIVATE *tkp;
 402
 403         tkp = GTKP(gp);
 404         (void)sigaction(SIGHUP, NULL, &tkp->oact[INDX_HUP]);
 405         (void)sigaction(SIGINT, NULL, &tkp->oact[INDX_INT]);
 406         (void)sigaction(SIGTERM, NULL, &tkp->oact[INDX_TERM]);
 407         (void)sigaction(SIGWINCH, NULL, &tkp->oact[INDX_WINCH]);
 408 }
 409
 410 /*
 411  * perr --
 412  *      Print system error.
 413  */
 414 static void
 415 perr(name, msg)
 416         char *name, *msg;
 417 {
 418         (void)fprintf(stderr, "%s:", name);
 419         if (msg != NULL)
 420                 (void)fprintf(stderr, "%s:", msg);
 421         (void)fprintf(stderr, "%s\n", strerror(errno));
 422         exit(1);
 423 }