cl/cl_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[] = "$Id: cl_main.c,v 10.54 2001/07/29 19:07:27 skimo Exp $ (Berkeley) $Date: 2001/07/29 19:07:27 $";
  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 "../ip/extern.h"
  31 #include "cl.h"
  32 #include "pathnames.h"
  33
  34 GS *__global_list;                              /* GLOBAL: List of screens. */
  35 sigset_t __sigblockset;                         /* GLOBAL: Blocked signals. */
  36
  37 static void        cl_func_std __P((WIN *));
  38 static void        cl_end __P((CL_PRIVATE *));
  39 static CL_PRIVATE *cl_init __P((WIN *));
  40 static void        perr __P((char *, char *));
  41 static int         setsig __P((int, struct sigaction *, void (*)(int)));
  42 static void        sig_end __P((GS *));
  43 static void        term_init __P((char *, char *));
  44
  45 /*
  46  * main --
  47  *      This is the main loop for the standalone curses editor.
  48  */
  49 int
  50 main(int argc, char **argv)
  51 {
  52         static int reenter;
  53         CL_PRIVATE *clp;
  54         GS *gp;
  55         WIN *wp;
  56         size_t rows, cols;
  57         int rval;
  58         char **p_av, **t_av, *ttype;
  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         /*
  68          * Strip out any arguments that vi isn't going to understand.  There's
  69          * no way to portably call getopt twice, so arguments parsed here must
  70          * be removed from the argument list.
  71          */
  72         for (p_av = t_av = argv;;) {
  73                 if (*t_av == NULL) {
  74                         *p_av = NULL;
  75                         break;
  76                 }
  77                 if (!strcmp(*t_av, "--")) {
  78                         while ((*p_av++ = *t_av++) != NULL);
  79                         break;
  80                 }
  81                 *p_av++ = *t_av++;
  82         }
  83
  84         /* Create new window */
  85         wp = gs_new_win(gp);
  86
  87         /* Create and initialize the CL_PRIVATE structure. */
  88         clp = cl_init(wp);
  89
  90         /*
  91          * Initialize the terminal information.
  92          *
  93          * We have to know what terminal it is from the start, since we may
  94          * have to use termcap/terminfo to find out how big the screen is.
  95          */
  96         if ((ttype = getenv("TERM")) == NULL)
  97                 ttype = "unknown";
  98         term_init(gp->progname, ttype);
  99
 100         /* Add the terminal type to the global structure. */
 101         if ((OG_D_STR(gp, GO_TERM) =
 102             OG_STR(gp, GO_TERM) = strdup(ttype)) == NULL)
 103                 perr(gp->progname, NULL);
 104
 105         /* Figure out how big the screen is. */
 106         if (cl_ssize(NULL, 0, &rows, &cols, NULL))
 107                 exit (1);
 108
 109         /* Add the rows and columns to the global structure. */
 110         OG_VAL(gp, GO_LINES) = OG_D_VAL(gp, GO_LINES) = rows;
 111         OG_VAL(gp, GO_COLUMNS) = OG_D_VAL(gp, GO_COLUMNS) = cols;
 112
 113         /* Ex wants stdout to be buffered. */
 114         (void)setvbuf(stdout, NULL, _IOFBF, 0);
 115
 116         /* Start catching signals. */
 117         if (sig_init(gp, NULL))
 118                 exit (1);
 119
 120         /* Run ex/vi. */
 121         rval = editor(wp, argc, argv);
 122
 123         /* Clean out the global structure. */
 124         gs_end(gp);
 125
 126         /* Clean up signals. */
 127         sig_end(gp);
 128
 129         /* Clean up the terminal. */
 130         (void)cl_quit(gp);
 131
 132         /*
 133          * XXX
 134          * Reset the O_MESG option.
 135          */
 136         if (clp->tgw != TGW_UNKNOWN)
 137                 (void)cl_omesg(NULL, clp, clp->tgw == TGW_SET);
 138
 139         /*
 140          * XXX
 141          * Reset the X11 xterm icon/window name.
 142          */
 143         if (F_ISSET(clp, CL_RENAME))
 144                 cl_setname(gp, clp->oname);
 145
 146         /* If a killer signal arrived, pretend we just got it. */
 147         if (clp->killersig) {
 148                 (void)signal(clp->killersig, SIG_DFL);
 149                 (void)kill(getpid(), clp->killersig);
 150                 /* NOTREACHED */
 151         }
 152
 153         /* Free the global and CL private areas. */
 154 #if defined(DEBUG) || defined(PURIFY) || defined(LIBRARY)
 155         cl_end(clp);
 156         free(gp);
 157 #endif
 158
 159         exit (rval);
 160 }
 161
 162 /*
 163  * cl_init --
 164  *      Create and partially initialize the CL structure.
 165  */
 166 static CL_PRIVATE *
 167 cl_init(WIN *wp)
 168 {
 169         CL_PRIVATE *clp;
 170         int fd;
 171         GS *gp;
 172
 173         gp = wp->gp;
 174
 175         /* Allocate the CL private structure. */
 176         CALLOC_NOMSG(NULL, clp, CL_PRIVATE *, 1, sizeof(CL_PRIVATE));
 177         if (clp == NULL)
 178                 perr(gp->progname, NULL);
 179         gp->cl_private = clp;
 180
 181         /*
 182          * Set the CL_STDIN_TTY flag.  It's purpose is to avoid setting
 183          * and resetting the tty if the input isn't from there.  We also
 184          * use the same test to determine if we're running a script or
 185          * not.
 186          */
 187         if (isatty(STDIN_FILENO))
 188                 F_SET(clp, CL_STDIN_TTY);
 189         else
 190                 F_SET(gp, G_SCRIPTED);
 191
 192         /*
 193          * We expect that if we've lost our controlling terminal that the
 194          * open() (but not the tcgetattr()) will fail.
 195          */
 196         if (F_ISSET(clp, CL_STDIN_TTY)) {
 197                 if (tcgetattr(STDIN_FILENO, &clp->orig) == -1)
 198                         goto tcfail;
 199         } else if ((fd = open(_PATH_TTY, O_RDONLY, 0)) != -1) {
 200                 if (tcgetattr(fd, &clp->orig) == -1) {
 201 tcfail:                 perr(gp->progname, "tcgetattr");
 202                         exit (1);
 203                 }
 204                 (void)close(fd);
 205         }
 206
 207         /* Initialize the list of curses functions. */
 208         cl_func_std(wp);
 209
 210         return (clp);
 211 }
 212
 213 /*
 214  * cl_end --
 215  *      Discard the CL structure.
 216  */
 217 static void
 218 cl_end(CL_PRIVATE *clp)
 219 {
 220         if (clp->oname != NULL)
 221                 free(clp->oname);
 222         free(clp);
 223 }
 224
 225 /*
 226  * term_init --
 227  *      Initialize terminal information.
 228  */
 229 static void
 230 term_init(char *name, char *ttype)
 231 {
 232         int err;
 233
 234         /* Set up the terminal database information. */
 235         setupterm(ttype, STDOUT_FILENO, &err);
 236         switch (err) {
 237         case -1:
 238                 (void)fprintf(stderr,
 239                     "%s: No terminal database found\n", name);
 240                 exit (1);
 241         case 0:
 242                 (void)fprintf(stderr,
 243                     "%s: %s: unknown terminal type\n", name, ttype);
 244                 exit (1);
 245         }
 246 }
 247
 248 #define GLOBAL_CLP \
 249         CL_PRIVATE *clp = GCLP(__global_list);
 250 static void
 251 h_hup(int signo)
 252 {
 253         GLOBAL_CLP;
 254
 255         F_SET(clp, CL_SIGHUP);
 256         clp->killersig = SIGHUP;
 257 }
 258
 259 static void
 260 h_int(int signo)
 261 {
 262         GLOBAL_CLP;
 263
 264         F_SET(clp, CL_SIGINT);
 265 }
 266
 267 static void
 268 h_term(int signo)
 269 {
 270         GLOBAL_CLP;
 271
 272         F_SET(clp, CL_SIGTERM);
 273         clp->killersig = SIGTERM;
 274 }
 275
 276 static void
 277 h_winch(int signo)
 278 {
 279         GLOBAL_CLP;
 280
 281         F_SET(clp, CL_SIGWINCH);
 282 }
 283 #undef  GLOBAL_CLP
 284
 285 /*
 286  * sig_init --
 287  *      Initialize signals.
 288  *
 289  * PUBLIC: int sig_init __P((GS *, SCR *));
 290  */
 291 int
 292 sig_init(GS *gp, SCR *sp)
 293 {
 294         CL_PRIVATE *clp;
 295
 296         clp = GCLP(gp);
 297
 298         if (sp == NULL) {
 299                 (void)sigemptyset(&__sigblockset);
 300                 if (sigaddset(&__sigblockset, SIGHUP) ||
 301                     setsig(SIGHUP, &clp->oact[INDX_HUP], h_hup) ||
 302                     sigaddset(&__sigblockset, SIGINT) ||
 303                     setsig(SIGINT, &clp->oact[INDX_INT], h_int) ||
 304                     sigaddset(&__sigblockset, SIGTERM) ||
 305                     setsig(SIGTERM, &clp->oact[INDX_TERM], h_term)
 306 #ifdef SIGWINCH
 307                     ||
 308                     sigaddset(&__sigblockset, SIGWINCH) ||
 309                     setsig(SIGWINCH, &clp->oact[INDX_WINCH], h_winch)
 310 #endif
 311                     ) {
 312                         perr(gp->progname, NULL);
 313                         return (1);
 314                 }
 315         } else
 316                 if (setsig(SIGHUP, NULL, h_hup) ||
 317                     setsig(SIGINT, NULL, h_int) ||
 318                     setsig(SIGTERM, NULL, h_term)
 319 #ifdef SIGWINCH
 320                     ||
 321                     setsig(SIGWINCH, NULL, h_winch)
 322 #endif
 323                     ) {
 324                         msgq(sp, M_SYSERR, "signal-reset");
 325                 }
 326         return (0);
 327 }
 328
 329 /*
 330  * setsig --
 331  *      Set a signal handler.
 332  */
 333 static int
 334 setsig(int signo, struct sigaction *oactp, void (*handler) (int))
 335 {
 336         struct sigaction act;
 337
 338         /*
 339          * Use sigaction(2), not signal(3), since we don't always want to
 340          * restart system calls.  The example is when waiting for a command
 341          * mode keystroke and SIGWINCH arrives.  Besides, you can't portably
 342          * restart system calls (thanks, POSIX!).  On the other hand, you
 343          * can't portably NOT restart system calls (thanks, Sun!).  SunOS
 344          * used SA_INTERRUPT as their extension to NOT restart read calls.
 345          * We sure hope nobody else used it for anything else.  Mom told me
 346          * there'd be days like this.  She just never told me that there'd
 347          * be so many.
 348          */
 349         act.sa_handler = handler;
 350         sigemptyset(&act.sa_mask);
 351
 352 #ifdef SA_INTERRUPT
 353         act.sa_flags = SA_INTERRUPT;
 354 #else
 355         act.sa_flags = 0;
 356 #endif
 357         return (sigaction(signo, &act, oactp));
 358 }
 359
 360 /*
 361  * sig_end --
 362  *      End signal setup.
 363  */
 364 static void
 365 sig_end(GS *gp)
 366 {
 367         CL_PRIVATE *clp;
 368
 369         clp = GCLP(gp);
 370         (void)sigaction(SIGHUP, NULL, &clp->oact[INDX_HUP]);
 371         (void)sigaction(SIGINT, NULL, &clp->oact[INDX_INT]);
 372         (void)sigaction(SIGTERM, NULL, &clp->oact[INDX_TERM]);
 373 #ifdef SIGWINCH
 374         (void)sigaction(SIGWINCH, NULL, &clp->oact[INDX_WINCH]);
 375 #endif
 376 }
 377
 378 /*
 379  * cl_func_std --
 380  *      Initialize the standard curses functions.
 381  */
 382 static void
 383 cl_func_std(WIN *wp)
 384 {
 385         GS *gp;
 386
 387         gp = wp->gp;
 388
 389         gp->scr_addstr = cl_addstr;
 390         gp->scr_waddstr = cl_waddstr;
 391         gp->scr_attr = cl_attr;
 392         gp->scr_baud = cl_baud;
 393         gp->scr_bell = cl_bell;
 394         gp->scr_busy = NULL;
 395         gp->scr_child = NULL;
 396         gp->scr_clrtoeol = cl_clrtoeol;
 397         gp->scr_cursor = cl_cursor;
 398         gp->scr_deleteln = cl_deleteln;
 399         gp->scr_reply = NULL;
 400         gp->scr_discard = cl_discard;
 401         gp->scr_event = cl_event;
 402         gp->scr_ex_adjust = cl_ex_adjust;
 403         gp->scr_fmap = cl_fmap;
 404         gp->scr_insertln = cl_insertln;
 405         gp->scr_keyval = cl_keyval;
 406         gp->scr_move = cl_move;
 407         wp->scr_msg = NULL;
 408         gp->scr_optchange = cl_optchange;
 409         gp->scr_refresh = cl_refresh;
 410         gp->scr_rename = cl_rename;
 411         gp->scr_screen = cl_screen;
 412         gp->scr_split = cl_split;
 413         gp->scr_suspend = cl_suspend;
 414         gp->scr_usage = cl_usage;
 415 }
 416
 417 /*
 418  * perr --
 419  *      Print system error.
 420  */
 421 static void
 422 perr(char *name, char *msg)
 423 {
 424         (void)fprintf(stderr, "%s:", name);
 425         if (msg != NULL)
 426                 (void)fprintf(stderr, "%s:", msg);
 427         (void)fprintf(stderr, "%s\n", strerror(errno));
 428         exit(1);
 429 }