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 <term.h>
  27 #include <termios.h>
  28 #include <unistd.h>
  29
  30 #include "../common/common.h"
  31 #include "../ip/extern.h"
  32 #include "cl.h"
  33 #include "pathnames.h"
  34
  35 GS *__global_list;                              /* GLOBAL: List of screens. */
  36 sigset_t __sigblockset;                         /* GLOBAL: Blocked signals. */
  37
  38 static void        cl_func_std __P((WIN *));
  39 static void        cl_end __P((CL_PRIVATE *));
  40 static CL_PRIVATE *cl_init __P((WIN *));
  41 static void        perr __P((char *, char *));
  42 static int         setsig __P((int, struct sigaction *, void (*)(int)));
  43 static void        sig_end __P((GS *));
  44 static void        term_init __P((char *, char *));
  45
  46 /*
  47  * main --
  48  *      This is the main loop for the standalone curses editor.
  49  */
  50 int
  51 main(int argc, char **argv)
  52 {
  53         static int reenter;
  54         CL_PRIVATE *clp;
  55         GS *gp;
  56         WIN *wp;
  57         size_t rows, cols;
  58         int rval;
  59         char **p_av, **t_av, *ttype;
  60
  61         /* If loaded at 0 and jumping through a NULL pointer, stop. */
  62         if (reenter++)
  63                 abort();
  64
  65         /* Create and initialize the global structure. */
  66         __global_list = gp = gs_init(argv[0]);
  67
  68         /*
  69          * Strip out any arguments that vi isn't going to understand.  There's
  70          * no way to portably call getopt twice, so arguments parsed here must
  71          * be removed from the argument list.
  72          */
  73         for (p_av = t_av = argv;;) {
  74                 if (*t_av == NULL) {
  75                         *p_av = NULL;
  76                         break;
  77                 }
  78                 if (!strcmp(*t_av, "--")) {
  79                         while ((*p_av++ = *t_av++) != NULL);
  80                         break;
  81                 }
  82                 *p_av++ = *t_av++;
  83         }
  84
  85         /* Create new window */
  86         wp = gs_new_win(gp);
  87
  88         /* Create and initialize the CL_PRIVATE structure. */
  89         clp = cl_init(wp);
  90
  91         /*
  92          * Initialize the terminal information.
  93          *
  94          * We have to know what terminal it is from the start, since we may
  95          * have to use termcap/terminfo to find out how big the screen is.
  96          */
  97         if ((ttype = getenv("TERM")) == NULL)
  98                 ttype = "unknown";
  99         term_init(gp->progname, ttype);
 100
 101         /* Add the terminal type to the global structure. */
 102         if ((OG_D_STR(gp, GO_TERM) =
 103             OG_STR(gp, GO_TERM) = strdup(ttype)) == NULL)
 104                 perr(gp->progname, NULL);
 105
 106         /* Figure out how big the screen is. */
 107         if (cl_ssize(NULL, 0, &rows, &cols, NULL))
 108                 exit (1);
 109
 110         /* Add the rows and columns to the global structure. */
 111         OG_VAL(gp, GO_LINES) = OG_D_VAL(gp, GO_LINES) = rows;
 112         OG_VAL(gp, GO_COLUMNS) = OG_D_VAL(gp, GO_COLUMNS) = cols;
 113
 114         /* Ex wants stdout to be buffered. */
 115         (void)setvbuf(stdout, NULL, _IOFBF, 0);
 116
 117         /* Start catching signals. */
 118         if (sig_init(gp, NULL))
 119                 exit (1);
 120
 121         /* Run ex/vi. */
 122         rval = editor(wp, argc, argv);
 123
 124         /* Clean out the global structure. */
 125         gs_end(gp);
 126
 127         /* Clean up signals. */
 128         sig_end(gp);
 129
 130         /* Clean up the terminal. */
 131         (void)cl_quit(gp);
 132
 133         /*
 134          * XXX
 135          * Reset the O_MESG option.
 136          */
 137         if (clp->tgw != TGW_UNKNOWN)
 138                 (void)cl_omesg(NULL, clp, clp->tgw == TGW_SET);
 139
 140         /*
 141          * XXX
 142          * Reset the X11 xterm icon/window name.
 143          */
 144         if (F_ISSET(clp, CL_RENAME))
 145                 cl_setname(gp, clp->oname);
 146
 147         /* If a killer signal arrived, pretend we just got it. */
 148         if (clp->killersig) {
 149                 (void)signal(clp->killersig, SIG_DFL);
 150                 (void)kill(getpid(), clp->killersig);
 151                 /* NOTREACHED */
 152         }
 153
 154         /* Free the global and CL private areas. */
 155 #if defined(DEBUG) || defined(PURIFY) || defined(LIBRARY)
 156         cl_end(clp);
 157         free(gp);
 158 #endif
 159
 160         exit (rval);
 161 }
 162
 163 /*
 164  * cl_init --
 165  *      Create and partially initialize the CL structure.
 166  */
 167 static CL_PRIVATE *
 168 cl_init(WIN *wp)
 169 {
 170         CL_PRIVATE *clp;
 171         int fd;
 172         GS *gp;
 173
 174         gp = wp->gp;
 175
 176         /* Allocate the CL private structure. */
 177         CALLOC_NOMSG(NULL, clp, CL_PRIVATE *, 1, sizeof(CL_PRIVATE));
 178         if (clp == NULL)
 179                 perr(gp->progname, NULL);
 180         gp->cl_private = clp;
 181
 182         /*
 183          * Set the CL_STDIN_TTY flag.  It's purpose is to avoid setting
 184          * and resetting the tty if the input isn't from there.  We also
 185          * use the same test to determine if we're running a script or
 186          * not.
 187          */
 188         if (isatty(STDIN_FILENO))
 189                 F_SET(clp, CL_STDIN_TTY);
 190         else
 191                 F_SET(gp, G_SCRIPTED);
 192
 193         /*
 194          * We expect that if we've lost our controlling terminal that the
 195          * open() (but not the tcgetattr()) will fail.
 196          */
 197         if (F_ISSET(clp, CL_STDIN_TTY)) {
 198                 if (tcgetattr(STDIN_FILENO, &clp->orig) == -1)
 199                         goto tcfail;
 200         } else if ((fd = open(_PATH_TTY, O_RDONLY, 0)) != -1) {
 201                 if (tcgetattr(fd, &clp->orig) == -1) {
 202 tcfail:                 perr(gp->progname, "tcgetattr");
 203                         exit (1);
 204                 }
 205                 (void)close(fd);
 206         }
 207
 208         /* Initialize the list of curses functions. */
 209         cl_func_std(wp);
 210
 211         return (clp);
 212 }
 213
 214 /*
 215  * cl_end --
 216  *      Discard the CL structure.
 217  */
 218 static void
 219 cl_end(CL_PRIVATE *clp)
 220 {
 221         if (clp->oname != NULL)
 222                 free(clp->oname);
 223         free(clp);
 224 }
 225
 226 /*
 227  * term_init --
 228  *      Initialize terminal information.
 229  */
 230 static void
 231 term_init(char *name, char *ttype)
 232 {
 233         int err;
 234
 235         /* Set up the terminal database information. */
 236         setupterm(ttype, STDOUT_FILENO, &err);
 237         switch (err) {
 238         case -1:
 239                 (void)fprintf(stderr,
 240                     "%s: No terminal database found\n", name);
 241                 exit (1);
 242         case 0:
 243                 (void)fprintf(stderr,
 244                     "%s: %s: unknown terminal type\n", name, ttype);
 245                 exit (1);
 246         }
 247 }
 248
 249 #define GLOBAL_CLP \
 250         CL_PRIVATE *clp = GCLP(__global_list);
 251 static void
 252 h_hup(int signo)
 253 {
 254         GLOBAL_CLP;
 255
 256         F_SET(clp, CL_SIGHUP);
 257         clp->killersig = SIGHUP;
 258 }
 259
 260 static void
 261 h_int(int signo)
 262 {
 263         GLOBAL_CLP;
 264
 265         F_SET(clp, CL_SIGINT);
 266 }
 267
 268 static void
 269 h_term(int signo)
 270 {
 271         GLOBAL_CLP;
 272
 273         F_SET(clp, CL_SIGTERM);
 274         clp->killersig = SIGTERM;
 275 }
 276
 277 static void
 278 h_winch(int signo)
 279 {
 280         GLOBAL_CLP;
 281
 282         F_SET(clp, CL_SIGWINCH);
 283 }
 284 #undef  GLOBAL_CLP
 285
 286 /*
 287  * sig_init --
 288  *      Initialize signals.
 289  *
 290  * PUBLIC: int sig_init __P((GS *, SCR *));
 291  */
 292 int
 293 sig_init(GS *gp, SCR *sp)
 294 {
 295         CL_PRIVATE *clp;
 296
 297         clp = GCLP(gp);
 298
 299         if (sp == NULL) {
 300                 (void)sigemptyset(&__sigblockset);
 301                 if (sigaddset(&__sigblockset, SIGHUP) ||
 302                     setsig(SIGHUP, &clp->oact[INDX_HUP], h_hup) ||
 303                     sigaddset(&__sigblockset, SIGINT) ||
 304                     setsig(SIGINT, &clp->oact[INDX_INT], h_int) ||
 305                     sigaddset(&__sigblockset, SIGTERM) ||
 306                     setsig(SIGTERM, &clp->oact[INDX_TERM], h_term)
 307 #ifdef SIGWINCH
 308                     ||
 309                     sigaddset(&__sigblockset, SIGWINCH) ||
 310                     setsig(SIGWINCH, &clp->oact[INDX_WINCH], h_winch)
 311 #endif
 312                     ) {
 313                         perr(gp->progname, NULL);
 314                         return (1);
 315                 }
 316         } else
 317                 if (setsig(SIGHUP, NULL, h_hup) ||
 318                     setsig(SIGINT, NULL, h_int) ||
 319                     setsig(SIGTERM, NULL, h_term)
 320 #ifdef SIGWINCH
 321                     ||
 322                     setsig(SIGWINCH, NULL, h_winch)
 323 #endif
 324                     ) {
 325                         msgq(sp, M_SYSERR, "signal-reset");
 326                 }
 327         return (0);
 328 }
 329
 330 /*
 331  * setsig --
 332  *      Set a signal handler.
 333  */
 334 static int
 335 setsig(int signo, struct sigaction *oactp, void (*handler) (int))
 336 {
 337         struct sigaction act;
 338
 339         /*
 340          * Use sigaction(2), not signal(3), since we don't always want to
 341          * restart system calls.  The example is when waiting for a command
 342          * mode keystroke and SIGWINCH arrives.  Besides, you can't portably
 343          * restart system calls (thanks, POSIX!).  On the other hand, you
 344          * can't portably NOT restart system calls (thanks, Sun!).  SunOS
 345          * used SA_INTERRUPT as their extension to NOT restart read calls.
 346          * We sure hope nobody else used it for anything else.  Mom told me
 347          * there'd be days like this.  She just never told me that there'd
 348          * be so many.
 349          */
 350         act.sa_handler = handler;
 351         sigemptyset(&act.sa_mask);
 352
 353 #ifdef SA_INTERRUPT
 354         act.sa_flags = SA_INTERRUPT;
 355 #else
 356         act.sa_flags = 0;
 357 #endif
 358         return (sigaction(signo, &act, oactp));
 359 }
 360
 361 /*
 362  * sig_end --
 363  *      End signal setup.
 364  */
 365 static void
 366 sig_end(GS *gp)
 367 {
 368         CL_PRIVATE *clp;
 369
 370         clp = GCLP(gp);
 371         (void)sigaction(SIGHUP, NULL, &clp->oact[INDX_HUP]);
 372         (void)sigaction(SIGINT, NULL, &clp->oact[INDX_INT]);
 373         (void)sigaction(SIGTERM, NULL, &clp->oact[INDX_TERM]);
 374 #ifdef SIGWINCH
 375         (void)sigaction(SIGWINCH, NULL, &clp->oact[INDX_WINCH]);
 376 #endif
 377 }
 378
 379 /*
 380  * cl_func_std --
 381  *      Initialize the standard curses functions.
 382  */
 383 static void
 384 cl_func_std(WIN *wp)
 385 {
 386         GS *gp;
 387
 388         gp = wp->gp;
 389
 390         gp->scr_addstr = cl_addstr;
 391         gp->scr_waddstr = cl_waddstr;
 392         gp->scr_attr = cl_attr;
 393         gp->scr_baud = cl_baud;
 394         gp->scr_bell = cl_bell;
 395         gp->scr_busy = NULL;
 396         gp->scr_child = NULL;
 397         gp->scr_clrtoeol = cl_clrtoeol;
 398         gp->scr_cursor = cl_cursor;
 399         gp->scr_deleteln = cl_deleteln;
 400         gp->scr_reply = NULL;
 401         gp->scr_discard = cl_discard;
 402         gp->scr_event = cl_event;
 403         gp->scr_ex_adjust = cl_ex_adjust;
 404         gp->scr_fmap = cl_fmap;
 405         gp->scr_insertln = cl_insertln;
 406         gp->scr_keyval = cl_keyval;
 407         gp->scr_move = cl_move;
 408         wp->scr_msg = NULL;
 409         gp->scr_optchange = cl_optchange;
 410         gp->scr_refresh = cl_refresh;
 411         gp->scr_rename = cl_rename;
 412         gp->scr_screen = cl_screen;
 413         gp->scr_split = cl_split;
 414         gp->scr_suspend = cl_suspend;
 415         gp->scr_usage = cl_usage;
 416 }
 417
 418 /*
 419  * perr --
 420  *      Print system error.
 421  */
 422 static void
 423 perr(char *name, char *msg)
 424 {
 425         (void)fprintf(stderr, "%s:", name);
 426         if (msg != NULL)
 427                 (void)fprintf(stderr, "%s:", msg);
 428         (void)fprintf(stderr, "%s\n", strerror(errno));
 429         exit(1);
 430 }