2.11BSD#431 - /usr/src/ucb/ex/ex.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #if !defined(lint) && defined(DOSCCS)
   8: char *copyright =
   9: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
  10:  All rights reserved.\n";
  11: 
  12: static char *sccsid = "@(#)ex.c	7.5.1.1 (Berkeley) 8/12/86";
  13: #endif not lint
  14: 
  15: #include "ex.h"
  16: #include "ex_argv.h"
  17: #include "ex_temp.h"
  18: #include "ex_tty.h"
  19: 
  20: #ifdef TRACE
  21: char    tttrace[]   = { '/','d','e','v','/','t','t','y','x','x',0 };
  22: #endif
  23: 
  24: /*
  25:  * The code for ex is divided as follows:
  26:  *
  27:  * ex.c			Entry point and routines handling interrupt, hangup
  28:  *			signals; initialization code.
  29:  *
  30:  * ex_addr.c		Address parsing routines for command mode decoding.
  31:  *			Routines to set and check address ranges on commands.
  32:  *
  33:  * ex_cmds.c		Command mode command decoding.
  34:  *
  35:  * ex_cmds2.c		Subroutines for command decoding and processing of
  36:  *			file names in the argument list.  Routines to print
  37:  *			messages and reset state when errors occur.
  38:  *
  39:  * ex_cmdsub.c		Subroutines which implement command mode functions
  40:  *			such as append, delete, join.
  41:  *
  42:  * ex_data.c		Initialization of options.
  43:  *
  44:  * ex_get.c		Command mode input routines.
  45:  *
  46:  * ex_io.c		General input/output processing: file i/o, unix
  47:  *			escapes, filtering, source commands, preserving
  48:  *			and recovering.
  49:  *
  50:  * ex_put.c		Terminal driving and optimizing routines for low-level
  51:  *			output (cursor-positioning); output line formatting
  52:  *			routines.
  53:  *
  54:  * ex_re.c		Global commands, substitute, regular expression
  55:  *			compilation and execution.
  56:  *
  57:  * ex_set.c		The set command.
  58:  *
  59:  * ex_subr.c		Loads of miscellaneous subroutines.
  60:  *
  61:  * ex_temp.c		Editor buffer routines for main buffer and also
  62:  *			for named buffers (Q registers if you will.)
  63:  *
  64:  * ex_tty.c		Terminal dependent initializations from termcap
  65:  *			data base, grabbing of tty modes (at beginning
  66:  *			and after escapes).
  67:  *
  68:  * ex_unix.c		Routines for the ! command and its variations.
  69:  *
  70:  * ex_v*.c		Visual/open mode routines... see ex_v.c for a
  71:  *			guide to the overall organization.
  72:  */
  73: 
  74: /*
  75:  * Main procedure.  Process arguments and then
  76:  * transfer control to the main command processing loop
  77:  * in the routine commands.  We are entered as either "ex", "edit", "vi"
  78:  * or "view" and the distinction is made here.  Actually, we are "vi" if
  79:  * there is a 'v' in our name, "view" is there is a 'w', and "edit" if
  80:  * there is a 'd' in our name.  For edit we just diddle options;
  81:  * for vi we actually force an early visual command.
  82:  */
  83: main(ac, av)
  84:     register int ac;
  85:     register char *av[];
  86: {
  87: #ifndef VMUNIX
  88:     char *erpath = EXSTRINGS;
  89: #endif
  90:     register char *cp;
  91:     register int c;
  92:     bool recov = 0;
  93:     bool ivis;
  94:     bool itag = 0;
  95:     bool fast = 0;
  96:     extern int onemt();
  97: #ifdef TRACE
  98:     register char *tracef;
  99: #endif
 100: 
 101:     /*
 102: 	 * Immediately grab the tty modes so that we wont
 103: 	 * get messed up if an interrupt comes in quickly.
 104: 	 */
 105:     gTTY(1);
 106: #ifndef USG3TTY
 107:     normf = tty.sg_flags;
 108: #else
 109:     normf = tty;
 110: #endif
 111:     ppid = getpid();
 112:     /*
 113: 	 * Defend against d's, v's, w's, and a's in directories of
 114: 	 * path leading to our true name.
 115: 	 */
 116:     av[0] = tailpath(av[0]);
 117: 
 118:     /*
 119: 	 * Figure out how we were invoked: ex, edit, vi, view.
 120: 	 */
 121:     ivis = any('v', av[0]); /* "vi" */
 122:     if (any('w', av[0]))    /* "view" */
 123:         value(READONLY) = 1;
 124:     if (any('d', av[0])) {  /* "edit" */
 125:         value(OPEN) = 0;
 126:         value(REPORT) = 1;
 127:         value(MAGIC) = 0;
 128:     }
 129: 
 130: #ifndef VMUNIX
 131:     /*
 132: 	 * For debugging take files out of . if name is a.out.
 133: 	 */
 134:     if (av[0][0] == 'a')
 135:         erpath = tailpath(erpath);
 136: #endif
 137:     /*
 138: 	 * Open the error message file.
 139: 	 */
 140:     draino();
 141: #ifndef VMUNIX
 142:     erfile = open(erpath+4, 0);
 143:     if (erfile < 0) {
 144:         erfile = open(erpath, 0);
 145:     }
 146: #endif
 147:     pstop();
 148: 
 149:     /*
 150: 	 * Initialize interrupt handling.
 151: 	 */
 152:     oldhup = signal(SIGHUP, SIG_IGN);
 153:     if (oldhup == SIG_DFL)
 154:         signal(SIGHUP, onhup);
 155:     oldquit = signal(SIGQUIT, SIG_IGN);
 156:     ruptible = signal(SIGINT, SIG_IGN) == SIG_DFL;
 157:     if (signal(SIGTERM, SIG_IGN) == SIG_DFL)
 158:         signal(SIGTERM, onhup);
 159:     if (signal(SIGEMT, SIG_IGN) == SIG_DFL)
 160:         signal(SIGEMT, onemt);
 161: 
 162:     /*
 163: 	 * Process flag arguments.
 164: 	 */
 165:     ac--, av++;
 166:     while (ac && av[0][0] == '-') {
 167:         c = av[0][1];
 168:         if (c == 0) {
 169:             hush = 1;
 170:             value(AUTOPRINT) = 0;
 171:             fast++;
 172:         } else switch (c) {
 173: 
 174:         case 'R':
 175:             value(READONLY) = 1;
 176:             break;
 177: 
 178: #ifdef TRACE
 179:         case 'T':
 180:             if (av[0][2] == 0)
 181:                 tracef = "trace";
 182:             else {
 183:                 tracef = tttrace;
 184:                 tracef[8] = av[0][2];
 185:                 if (tracef[8])
 186:                     tracef[9] = av[0][3];
 187:                 else
 188:                     tracef[9] = 0;
 189:             }
 190:             trace = fopen(tracef, "w");
 191: #define tracbuf NULL
 192:             if (trace == NULL)
 193:                 printf("Trace create error\n");
 194:             else
 195:                 setbuf(trace, tracbuf);
 196:             break;
 197: 
 198: #endif
 199: 
 200: #ifdef LISPCODE
 201:         case 'l':
 202:             value(LISP) = 1;
 203:             value(SHOWMATCH) = 1;
 204:             break;
 205: #endif
 206: 
 207:         case 'r':
 208:             recov++;
 209:             break;
 210: 
 211:         case 't':
 212:             if (ac > 1 && av[1][0] != '-') {
 213:                 ac--, av++;
 214:                 itag = 1;
 215:                 /* BUG: should check for too long tag. */
 216:                 CP(lasttag, av[0]);
 217:             }
 218:             break;
 219: 
 220:         case 'v':
 221:             ivis = 1;
 222:             break;
 223: 
 224:         case 'w':
 225:             defwind = 0;
 226:             if (av[0][2] == 0) defwind = 3;
 227:             else for (cp = &av[0][2]; isdigit(*cp); cp++)
 228:                 defwind = 10*defwind + *cp - '0';
 229:             break;
 230: 
 231: 
 232:         default:
 233:             smerror("Unknown option %s\n", av[0]);
 234:             break;
 235:         }
 236:         ac--, av++;
 237:     }
 238: 
 239:     /*
 240: 	 * Initialize end of core pointers.
 241: 	 * Normally we avoid breaking back to fendcore after each
 242: 	 * file since this can be expensive (much core-core copying).
 243: 	 * If your system can scatter load processes you could do
 244: 	 * this as ed does, saving a little core, but it will probably
 245: 	 * not often make much difference.
 246: 	 */
 247:     fendcore = (line *) sbrk(0);
 248:     endcore = fendcore - 2;
 249: 
 250: #ifdef SIGTSTP
 251:     if (!hush && signal(SIGTSTP, SIG_IGN) == SIG_DFL)
 252:         signal(SIGTSTP, onsusp), dosusp++;
 253: #endif
 254: 
 255:     if (ac && av[0][0] == '+') {
 256:         firstpat = &av[0][1];
 257:         ac--, av++;
 258:     }
 259: 
 260: 
 261:     /*
 262: 	 * If we are doing a recover and no filename
 263: 	 * was given, then execute an exrecover command with
 264: 	 * the -r option to type out the list of saved file names.
 265: 	 * Otherwise set the remembered file name to the first argument
 266: 	 * file name so the "recover" initial command will find it.
 267: 	 */
 268:     if (recov) {
 269:         if (ac == 0) {
 270:             ppid = 0;
 271:             setrupt();
 272:             execl(EXRECOVER, "exrecover", "-r", 0);
 273:             filioerr(EXRECOVER);
 274:             exit(1);
 275:         }
 276:         CP(savedfile, *av++), ac--;
 277:     }
 278: 
 279:     /*
 280: 	 * Initialize the argument list.
 281: 	 */
 282:     argv0 = av;
 283:     argc0 = ac;
 284:     args0 = av[0];
 285:     erewind();
 286: 
 287:     /*
 288: 	 * Initialize a temporary file (buffer) and
 289: 	 * set up terminal environment.  Read user startup commands.
 290: 	 */
 291:     if (setexit() == 0) {
 292:         setrupt();
 293:         intty = isatty(0);
 294:         value(PROMPT) = intty;
 295:         if (cp = getenv("SHELL"))
 296:             CP(shell, cp);
 297:         if (fast || !intty)
 298:             setterm("dumb");
 299:         else {
 300:             gettmode();
 301:             if ((cp = getenv("TERM")) != 0 && *cp)
 302:                 setterm(cp);
 303:         }
 304:     }
 305:     if (setexit() == 0 && !fast && intty) {
 306:         if ((globp = getenv("EXINIT")) && *globp)
 307:             commands(1,1);
 308:         else {
 309:             globp = 0;
 310:             if ((cp = getenv("HOME")) != 0 && *cp) {
 311:                 (void) strcat(strcpy(genbuf, cp), "/.exrc");
 312:                 if (iownit(genbuf))
 313:                     source(genbuf, 1);
 314:             }
 315:         }
 316:         /*
 317: 		 * Allow local .exrc too.  This loses if . is $HOME,
 318: 		 * but nobody should notice unless they do stupid things
 319: 		 * like putting a version command in .exrc.  Besides,
 320: 		 * they should be using EXINIT, not .exrc, right?
 321: 		 */
 322:          if (iownit(".exrc"))
 323:             source(".exrc", 1);
 324:     }
 325:     init(); /* moved after prev 2 chunks to fix directory option */
 326: 
 327:     /*
 328: 	 * Initial processing.  Handle tag, recover, and file argument
 329: 	 * implied next commands.  If going in as 'vi', then don't do
 330: 	 * anything, just set initev so we will do it later (from within
 331: 	 * visual).
 332: 	 */
 333:     if (setexit() == 0) {
 334:         if (recov)
 335:             globp = "recover";
 336:         else if (itag)
 337:             globp = ivis ? "tag" : "tag|p";
 338:         else if (argc)
 339:             globp = "next";
 340:         if (ivis)
 341:             initev = globp;
 342:         else if (globp) {
 343:             inglobal = 1;
 344:             commands(1, 1);
 345:             inglobal = 0;
 346:         }
 347:     }
 348: 
 349:     /*
 350: 	 * Vi command... go into visual.
 351: 	 * Strange... everything in vi usually happens
 352: 	 * before we ever "start".
 353: 	 */
 354:     if (ivis) {
 355:         /*
 356: 		 * Don't have to be upward compatible with stupidity
 357: 		 * of starting editing at line $.
 358: 		 */
 359:         if (dol > zero)
 360:             dot = one;
 361:         globp = "visual";
 362:         if (setexit() == 0)
 363:             commands(1, 1);
 364:     }
 365: 
 366:     /*
 367: 	 * Clear out trash in state accumulated by startup,
 368: 	 * and then do the main command loop for a normal edit.
 369: 	 * If you quit out of a 'vi' command by doing Q or ^\,
 370: 	 * you also fall through to here.
 371: 	 */
 372:     seenprompt = 1;
 373:     ungetchar(0);
 374:     globp = 0;
 375:     initev = 0;
 376:     setlastchar('\n');
 377:     setexit();
 378:     commands(0, 0);
 379:     cleanup(1);
 380:     exit(0);
 381: }
 382: 
 383: /*
 384:  * Initialization, before editing a new file.
 385:  * Main thing here is to get a new buffer (in fileinit),
 386:  * rest is peripheral state resetting.
 387:  */
 388: init()
 389: {
 390:     register int i;
 391: 
 392:     fileinit();
 393:     dot = zero = truedol = unddol = dol = fendcore;
 394:     one = zero+1;
 395:     undkind = UNDNONE;
 396:     chng = 0;
 397:     edited = 0;
 398:     for (i = 0; i <= 'z'-'a'+1; i++)
 399:         names[i] = 1;
 400:     anymarks = 0;
 401: }
 402: 
 403: /*
 404:  * Return last component of unix path name p.
 405:  */
 406: char *
 407: tailpath(p)
 408: register char *p;
 409: {
 410:     register char *r;
 411: 
 412:     for (r=p; *p; p++)
 413:         if (*p == '/')
 414:             r = p+1;
 415:     return(r);
 416: }
 417: 
 418: /*
 419:  * Check ownership of file.  Return nonzero if it exists and is owned by the
 420:  * user or the option sourceany is used
 421:  */
 422: iownit(file)
 423: char *file;
 424: {
 425:     struct stat sb;
 426: 
 427:     if (stat(file, &sb) == 0 && (value(SOURCEANY) || sb.st_uid == getuid()))
 428:         return(1);
 429:     else
 430:         return(0);
 431: }

Defined functions

Defined variables

Defined macros