bin/ed/main.c

   1 /* main.c: This file contains the main control and user-interface routines
   2    for the ed line editor. */
   3 /*-
   4  * Copyright (c) 1993 Andrew Moore, Talke Studio.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #ifndef lint
  30 #if 0
  31 static const char copyright[] =
  32 "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\
  33  All rights reserved.\n";
  34 #endif
  35 #endif /* not lint */
  36
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 /*
  41  * CREDITS
  42  *
  43  *      This program is based on the editor algorithm described in
  44  *      Brian W. Kernighan and P. J. Plauger's book "Software Tools
  45  *      in Pascal," Addison-Wesley, 1981.
  46  *
  47  *      The buffering algorithm is attributed to Rodney Ruddock of
  48  *      the University of Guelph, Guelph, Ontario.
  49  *
  50  *      The cbc.c encryption code is adapted from
  51  *      the bdes program by Matt Bishop of Dartmouth College,
  52  *      Hanover, NH.
  53  *
  54  */
  55
  56 #include <sys/types.h>
  57
  58 #include <sys/ioctl.h>
  59 #include <sys/wait.h>
  60 #include <ctype.h>
  61 #include <locale.h>
  62 #include <pwd.h>
  63 #include <setjmp.h>
  64
  65 #include "ed.h"
  66
  67
  68 #ifdef _POSIX_SOURCE
  69 static sigjmp_buf env;
  70 #else
  71 static jmp_buf env;
  72 #endif
  73
  74 /* static buffers */
  75 char stdinbuf[1];               /* stdin buffer */
  76 static char *shcmd;             /* shell command buffer */
  77 static int shcmdsz;             /* shell command buffer size */
  78 static int shcmdi;              /* shell command buffer index */
  79 char *ibuf;                     /* ed command-line buffer */
  80 int ibufsz;                     /* ed command-line buffer size */
  81 char *ibufp;                    /* pointer to ed command-line buffer */
  82
  83 /* global flags */
  84 int des = 0;                    /* if set, use crypt(3) for i/o */
  85 static int garrulous = 0;       /* if set, print all error messages */
  86 int isbinary;                   /* if set, buffer contains ASCII NULs */
  87 int isglobal;                   /* if set, doing a global command */
  88 int modified;                   /* if set, buffer modified since last write */
  89 int mutex = 0;                  /* if set, signals set "sigflags" */
  90 static int red = 0;             /* if set, restrict shell/directory access */
  91 int scripted = 0;               /* if set, suppress diagnostics */
  92 int sigflags = 0;               /* if set, signals received while mutex set */
  93 static int sigactive = 0;       /* if set, signal handlers are enabled */
  94
  95 static char old_filename[PATH_MAX] = ""; /* default filename */
  96 long current_addr;              /* current address in editor buffer */
  97 long addr_last;                 /* last address in editor buffer */
  98 int lineno;                     /* script line number */
  99 static const char *prompt;      /* command-line prompt */
 100 static const char *dps = "*";   /* default command-line prompt */
 101
 102 static const char *usage = "usage: %s [-] [-sx] [-p string] [file]\n";
 103
 104 /* ed: line editor */
 105 int
 106 main(volatile int argc, char ** volatile argv)
 107 {
 108         int c, n;
 109         long status = 0;
 110
 111         (void)setlocale(LC_ALL, "");
 112
 113         red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
 114 top:
 115         while ((c = getopt(argc, argv, "p:sx")) != -1)
 116                 switch(c) {
 117                 case 'p':                               /* set prompt */
 118                         prompt = optarg;
 119                         break;
 120                 case 's':                               /* run script */
 121                         scripted = 1;
 122                         break;
 123                 case 'x':                               /* use crypt */
 124 #ifdef DES
 125                         des = get_keyword();
 126 #else
 127                         fprintf(stderr, "crypt unavailable\n?\n");
 128 #endif
 129                         break;
 130
 131                 default:
 132                         fprintf(stderr, usage, red ? "red" : "ed");
 133                         exit(1);
 134                 }
 135         argv += optind;
 136         argc -= optind;
 137         if (argc && **argv == '-') {
 138                 scripted = 1;
 139                 if (argc > 1) {
 140                         optind = 1;
 141                         goto top;
 142                 }
 143                 argv++;
 144                 argc--;
 145         }
 146         /* assert: reliable signals! */
 147 #ifdef SIGWINCH
 148         handle_winch(SIGWINCH);
 149         if (isatty(0)) signal(SIGWINCH, handle_winch);
 150 #endif
 151         signal(SIGHUP, signal_hup);
 152         signal(SIGQUIT, SIG_IGN);
 153         signal(SIGINT, signal_int);
 154 #ifdef _POSIX_SOURCE
 155         if ((status = sigsetjmp(env, 1)))
 156 #else
 157         if ((status = setjmp(env)))
 158 #endif
 159         {
 160                 fputs("\n?\n", stderr);
 161                 errmsg = "interrupt";
 162         } else {
 163                 init_buffers();
 164                 sigactive = 1;                  /* enable signal handlers */
 165                 if (argc && **argv && is_legal_filename(*argv)) {
 166                         if (read_file(*argv, 0) < 0 && !isatty(0))
 167                                 quit(2);
 168                         else if (**argv != '!')
 169                                 if (strlcpy(old_filename, *argv, sizeof(old_filename))
 170                                     >= sizeof(old_filename))
 171                                         quit(2);
 172                 } else if (argc) {
 173                         fputs("?\n", stderr);
 174                         if (**argv == '\0')
 175                                 errmsg = "invalid filename";
 176                         if (!isatty(0))
 177                                 quit(2);
 178                 }
 179         }
 180         for (;;) {
 181                 if (status < 0 && garrulous)
 182                         fprintf(stderr, "%s\n", errmsg);
 183                 if (prompt) {
 184                         printf("%s", prompt);
 185                         fflush(stdout);
 186                 }
 187                 if ((n = get_tty_line()) < 0) {
 188                         status = ERR;
 189                         continue;
 190                 } else if (n == 0) {
 191                         if (modified && !scripted) {
 192                                 fputs("?\n", stderr);
 193                                 errmsg = "warning: file modified";
 194                                 if (!isatty(0)) {
 195                                         if (garrulous)
 196                                                 fprintf(stderr,
 197                                                     "script, line %d: %s\n",
 198                                                     lineno, errmsg);
 199                                         quit(2);
 200                                 }
 201                                 clearerr(stdin);
 202                                 modified = 0;
 203                                 status = EMOD;
 204                                 continue;
 205                         } else
 206                                 quit(0);
 207                 } else if (ibuf[n - 1] != '\n') {
 208                         /* discard line */
 209                         errmsg = "unexpected end-of-file";
 210                         clearerr(stdin);
 211                         status = ERR;
 212                         continue;
 213                 }
 214                 isglobal = 0;
 215                 if ((status = extract_addr_range()) >= 0 &&
 216                     (status = exec_command()) >= 0)
 217                         if (!status ||
 218                             (status = display_lines(current_addr, current_addr,
 219                                 status)) >= 0)
 220                                 continue;
 221                 switch (status) {
 222                 case EOF:
 223                         quit(0);
 224                 case EMOD:
 225                         modified = 0;
 226                         fputs("?\n", stderr);           /* give warning */
 227                         errmsg = "warning: file modified";
 228                         if (!isatty(0)) {
 229                                 if (garrulous)
 230                                         fprintf(stderr, "script, line %d: %s\n",
 231                                             lineno, errmsg);
 232                                 quit(2);
 233                         }
 234                         break;
 235                 case FATAL:
 236                         if (!isatty(0)) {
 237                                 if (garrulous)
 238                                         fprintf(stderr, "script, line %d: %s\n",
 239                                             lineno, errmsg);
 240                         } else if (garrulous)
 241                                 fprintf(stderr, "%s\n", errmsg);
 242                         quit(3);
 243                 default:
 244                         fputs("?\n", stderr);
 245                         if (!isatty(0)) {
 246                                 if (garrulous)
 247                                         fprintf(stderr, "script, line %d: %s\n",
 248                                             lineno, errmsg);
 249                                 quit(2);
 250                         }
 251                         break;
 252                 }
 253         }
 254         /*NOTREACHED*/
 255 }
 256
 257 long first_addr, second_addr;
 258 static long addr_cnt;
 259
 260 /* extract_addr_range: get line addresses from the command buffer until an
 261    illegal address is seen; return status */
 262 int
 263 extract_addr_range(void)
 264 {
 265         long addr;
 266
 267         addr_cnt = 0;
 268         first_addr = second_addr = current_addr;
 269         while ((addr = next_addr()) >= 0) {
 270                 addr_cnt++;
 271                 first_addr = second_addr;
 272                 second_addr = addr;
 273                 if (*ibufp != ',' && *ibufp != ';')
 274                         break;
 275                 else if (*ibufp++ == ';')
 276                         current_addr = addr;
 277         }
 278         if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
 279                 first_addr = second_addr;
 280         return (addr == ERR) ? ERR : 0;
 281 }
 282
 283
 284 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
 285
 286 #define MUST_BE_FIRST() do {                                    \
 287         if (!first) {                                           \
 288                 errmsg = "invalid address";                     \
 289                 return ERR;                                     \
 290         }                                                       \
 291 } while (0)
 292
 293 /*  next_addr: return the next line address in the command buffer */
 294 long
 295 next_addr(void)
 296 {
 297         const char *hd;
 298         long addr = current_addr;
 299         long n;
 300         int first = 1;
 301         int c;
 302
 303         SKIP_BLANKS();
 304         for (hd = ibufp;; first = 0)
 305                 switch (c = *ibufp) {
 306                 case '+':
 307                 case '\t':
 308                 case ' ':
 309                 case '-':
 310                 case '^':
 311                         ibufp++;
 312                         SKIP_BLANKS();
 313                         if (isdigit((unsigned char)*ibufp)) {
 314                                 STRTOL(n, ibufp);
 315                                 addr += (c == '-' || c == '^') ? -n : n;
 316                         } else if (!isspace((unsigned char)c))
 317                                 addr += (c == '-' || c == '^') ? -1 : 1;
 318                         break;
 319                 case '0': case '1': case '2':
 320                 case '3': case '4': case '5':
 321                 case '6': case '7': case '8': case '9':
 322                         MUST_BE_FIRST();
 323                         STRTOL(addr, ibufp);
 324                         break;
 325                 case '.':
 326                 case '$':
 327                         MUST_BE_FIRST();
 328                         ibufp++;
 329                         addr = (c == '.') ? current_addr : addr_last;
 330                         break;
 331                 case '/':
 332                 case '?':
 333                         MUST_BE_FIRST();
 334                         if ((addr = get_matching_node_addr(
 335                             get_compiled_pattern(), c == '/')) < 0)
 336                                 return ERR;
 337                         else if (c == *ibufp)
 338                                 ibufp++;
 339                         break;
 340                 case '\'':
 341                         MUST_BE_FIRST();
 342                         ibufp++;
 343                         if ((addr = get_marked_node_addr(*ibufp++)) < 0)
 344                                 return ERR;
 345                         break;
 346                 case '%':
 347                 case ',':
 348                 case ';':
 349                         if (first) {
 350                                 ibufp++;
 351                                 addr_cnt++;
 352                                 second_addr = (c == ';') ? current_addr : 1;
 353                                 if ((addr = next_addr()) < 0)
 354                                         addr = addr_last;
 355                                 break;
 356                         }
 357                         /* FALLTHROUGH */
 358                 default:
 359                         if (ibufp == hd)
 360                                 return EOF;
 361                         else if (addr < 0 || addr_last < addr) {
 362                                 errmsg = "invalid address";
 363                                 return ERR;
 364                         } else
 365                                 return addr;
 366                 }
 367         /* NOTREACHED */
 368 }
 369
 370
 371 #ifdef BACKWARDS
 372 /* GET_THIRD_ADDR: get a legal address from the command buffer */
 373 #define GET_THIRD_ADDR(addr) \
 374 { \
 375         long ol1, ol2; \
 376 \
 377         ol1 = first_addr, ol2 = second_addr; \
 378         if (extract_addr_range() < 0) \
 379                 return ERR; \
 380         else if (addr_cnt == 0) { \
 381                 errmsg = "destination expected"; \
 382                 return ERR; \
 383         } else if (second_addr < 0 || addr_last < second_addr) { \
 384                 errmsg = "invalid address"; \
 385                 return ERR; \
 386         } \
 387         addr = second_addr; \
 388         first_addr = ol1, second_addr = ol2; \
 389 }
 390 #else   /* BACKWARDS */
 391 /* GET_THIRD_ADDR: get a legal address from the command buffer */
 392 #define GET_THIRD_ADDR(addr) \
 393 { \
 394         long ol1, ol2; \
 395 \
 396         ol1 = first_addr, ol2 = second_addr; \
 397         if (extract_addr_range() < 0) \
 398                 return ERR; \
 399         if (second_addr < 0 || addr_last < second_addr) { \
 400                 errmsg = "invalid address"; \
 401                 return ERR; \
 402         } \
 403         addr = second_addr; \
 404         first_addr = ol1, second_addr = ol2; \
 405 }
 406 #endif
 407
 408
 409 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
 410 #define GET_COMMAND_SUFFIX() { \
 411         int done = 0; \
 412         do { \
 413                 switch(*ibufp) { \
 414                 case 'p': \
 415                         gflag |= GPR, ibufp++; \
 416                         break; \
 417                 case 'l': \
 418                         gflag |= GLS, ibufp++; \
 419                         break; \
 420                 case 'n': \
 421                         gflag |= GNP, ibufp++; \
 422                         break; \
 423                 default: \
 424                         done++; \
 425                 } \
 426         } while (!done); \
 427         if (*ibufp++ != '\n') { \
 428                 errmsg = "invalid command suffix"; \
 429                 return ERR; \
 430         } \
 431 }
 432
 433
 434 /* sflags */
 435 #define SGG 001         /* complement previous global substitute suffix */
 436 #define SGP 002         /* complement previous print suffix */
 437 #define SGR 004         /* use last regex instead of last pat */
 438 #define SGF 010         /* repeat last substitution */
 439
 440 int patlock = 0;        /* if set, pattern not freed by get_compiled_pattern() */
 441
 442 long rows = 22;         /* scroll length: ws_row - 2 */
 443
 444 /* exec_command: execute the next command in command buffer; return print
 445    request, if any */
 446 int
 447 exec_command(void)
 448 {
 449         static pattern_t *pat = NULL;
 450         static int sgflag = 0;
 451         static long sgnum = 0;
 452
 453         pattern_t *tpat;
 454         char *fnp;
 455         int gflag = 0;
 456         int sflags = 0;
 457         long addr = 0;
 458         int n = 0;
 459         int c;
 460
 461         SKIP_BLANKS();
 462         switch(c = *ibufp++) {
 463         case 'a':
 464                 GET_COMMAND_SUFFIX();
 465                 if (!isglobal) clear_undo_stack();
 466                 if (append_lines(second_addr) < 0)
 467                         return ERR;
 468                 break;
 469         case 'c':
 470                 if (check_addr_range(current_addr, current_addr) < 0)
 471                         return ERR;
 472                 GET_COMMAND_SUFFIX();
 473                 if (!isglobal) clear_undo_stack();
 474                 if (delete_lines(first_addr, second_addr) < 0 ||
 475                     append_lines(current_addr) < 0)
 476                         return ERR;
 477                 break;
 478         case 'd':
 479                 if (check_addr_range(current_addr, current_addr) < 0)
 480                         return ERR;
 481                 GET_COMMAND_SUFFIX();
 482                 if (!isglobal) clear_undo_stack();
 483                 if (delete_lines(first_addr, second_addr) < 0)
 484                         return ERR;
 485                 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
 486                         current_addr = addr;
 487                 break;
 488         case 'e':
 489                 if (modified && !scripted)
 490                         return EMOD;
 491                 /* FALLTHROUGH */
 492         case 'E':
 493                 if (addr_cnt > 0) {
 494                         errmsg = "unexpected address";
 495                         return ERR;
 496                 } else if (!isspace((unsigned char)*ibufp)) {
 497                         errmsg = "unexpected command suffix";
 498                         return ERR;
 499                 } else if ((fnp = get_filename()) == NULL)
 500                         return ERR;
 501                 GET_COMMAND_SUFFIX();
 502                 if (delete_lines(1, addr_last) < 0)
 503                         return ERR;
 504                 clear_undo_stack();
 505                 if (close_sbuf() < 0)
 506                         return ERR;
 507                 else if (open_sbuf() < 0)
 508                         return FATAL;
 509                 if (*fnp && *fnp != '!')
 510                          strlcpy(old_filename, fnp, PATH_MAX);
 511 #ifdef BACKWARDS
 512                 if (*fnp == '\0' && *old_filename == '\0') {
 513                         errmsg = "no current filename";
 514                         return ERR;
 515                 }
 516 #endif
 517                 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
 518                         return ERR;
 519                 clear_undo_stack();
 520                 modified = 0;
 521                 u_current_addr = u_addr_last = -1;
 522                 break;
 523         case 'f':
 524                 if (addr_cnt > 0) {
 525                         errmsg = "unexpected address";
 526                         return ERR;
 527                 } else if (!isspace((unsigned char)*ibufp)) {
 528                         errmsg = "unexpected command suffix";
 529                         return ERR;
 530                 } else if ((fnp = get_filename()) == NULL)
 531                         return ERR;
 532                 else if (*fnp == '!') {
 533                         errmsg = "invalid redirection";
 534                         return ERR;
 535                 }
 536                 GET_COMMAND_SUFFIX();
 537                 if (*fnp)
 538                         strlcpy(old_filename, fnp, PATH_MAX);
 539                 printf("%s\n", strip_escapes(old_filename));
 540                 break;
 541         case 'g':
 542         case 'v':
 543         case 'G':
 544         case 'V':
 545                 if (isglobal) {
 546                         errmsg = "cannot nest global commands";
 547                         return ERR;
 548                 } else if (check_addr_range(1, addr_last) < 0)
 549                         return ERR;
 550                 else if (build_active_list(c == 'g' || c == 'G') < 0)
 551                         return ERR;
 552                 else if ((n = (c == 'G' || c == 'V')))
 553                         GET_COMMAND_SUFFIX();
 554                 isglobal++;
 555                 if (exec_global(n, gflag) < 0)
 556                         return ERR;
 557                 break;
 558         case 'h':
 559                 if (addr_cnt > 0) {
 560                         errmsg = "unexpected address";
 561                         return ERR;
 562                 }
 563                 GET_COMMAND_SUFFIX();
 564                 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
 565                 break;
 566         case 'H':
 567                 if (addr_cnt > 0) {
 568                         errmsg = "unexpected address";
 569                         return ERR;
 570                 }
 571                 GET_COMMAND_SUFFIX();
 572                 if ((garrulous = 1 - garrulous) && *errmsg)
 573                         fprintf(stderr, "%s\n", errmsg);
 574                 break;
 575         case 'i':
 576                 if (second_addr == 0) {
 577                         errmsg = "invalid address";
 578                         return ERR;
 579                 }
 580                 GET_COMMAND_SUFFIX();
 581                 if (!isglobal) clear_undo_stack();
 582                 if (append_lines(second_addr - 1) < 0)
 583                         return ERR;
 584                 break;
 585         case 'j':
 586                 if (check_addr_range(current_addr, current_addr + 1) < 0)
 587                         return ERR;
 588                 GET_COMMAND_SUFFIX();
 589                 if (!isglobal) clear_undo_stack();
 590                 if (first_addr != second_addr &&
 591                     join_lines(first_addr, second_addr) < 0)
 592                         return ERR;
 593                 break;
 594         case 'k':
 595                 c = *ibufp++;
 596                 if (second_addr == 0) {
 597                         errmsg = "invalid address";
 598                         return ERR;
 599                 }
 600                 GET_COMMAND_SUFFIX();
 601                 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
 602                         return ERR;
 603                 break;
 604         case 'l':
 605                 if (check_addr_range(current_addr, current_addr) < 0)
 606                         return ERR;
 607                 GET_COMMAND_SUFFIX();
 608                 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
 609                         return ERR;
 610                 gflag = 0;
 611                 break;
 612         case 'm':
 613                 if (check_addr_range(current_addr, current_addr) < 0)
 614                         return ERR;
 615                 GET_THIRD_ADDR(addr);
 616                 if (first_addr <= addr && addr < second_addr) {
 617                         errmsg = "invalid destination";
 618                         return ERR;
 619                 }
 620                 GET_COMMAND_SUFFIX();
 621                 if (!isglobal) clear_undo_stack();
 622                 if (move_lines(addr) < 0)
 623                         return ERR;
 624                 break;
 625         case 'n':
 626                 if (check_addr_range(current_addr, current_addr) < 0)
 627                         return ERR;
 628                 GET_COMMAND_SUFFIX();
 629                 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
 630                         return ERR;
 631                 gflag = 0;
 632                 break;
 633         case 'p':
 634                 if (check_addr_range(current_addr, current_addr) < 0)
 635                         return ERR;
 636                 GET_COMMAND_SUFFIX();
 637                 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
 638                         return ERR;
 639                 gflag = 0;
 640                 break;
 641         case 'P':
 642                 if (addr_cnt > 0) {
 643                         errmsg = "unexpected address";
 644                         return ERR;
 645                 }
 646                 GET_COMMAND_SUFFIX();
 647                 prompt = prompt ? NULL : optarg ? optarg : dps;
 648                 break;
 649         case 'q':
 650         case 'Q':
 651                 if (addr_cnt > 0) {
 652                         errmsg = "unexpected address";
 653                         return ERR;
 654                 }
 655                 GET_COMMAND_SUFFIX();
 656                 gflag =  (modified && !scripted && c == 'q') ? EMOD : EOF;
 657                 break;
 658         case 'r':
 659                 if (!isspace((unsigned char)*ibufp)) {
 660                         errmsg = "unexpected command suffix";
 661                         return ERR;
 662                 } else if (addr_cnt == 0)
 663                         second_addr = addr_last;
 664                 if ((fnp = get_filename()) == NULL)
 665                         return ERR;
 666                 GET_COMMAND_SUFFIX();
 667                 if (!isglobal) clear_undo_stack();
 668                 if (*old_filename == '\0' && *fnp != '!')
 669                         strlcpy(old_filename, fnp, PATH_MAX);
 670 #ifdef BACKWARDS
 671                 if (*fnp == '\0' && *old_filename == '\0') {
 672                         errmsg = "no current filename";
 673                         return ERR;
 674                 }
 675 #endif
 676                 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
 677                         return ERR;
 678                 else if (addr && addr != addr_last)
 679                         modified = 1;
 680                 break;
 681         case 's':
 682                 do {
 683                         switch(*ibufp) {
 684                         case '\n':
 685                                 sflags |=SGF;
 686                                 break;
 687                         case 'g':
 688                                 sflags |= SGG;
 689                                 ibufp++;
 690                                 break;
 691                         case 'p':
 692                                 sflags |= SGP;
 693                                 ibufp++;
 694                                 break;
 695                         case 'r':
 696                                 sflags |= SGR;
 697                                 ibufp++;
 698                                 break;
 699                         case '0': case '1': case '2': case '3': case '4':
 700                         case '5': case '6': case '7': case '8': case '9':
 701                                 STRTOL(sgnum, ibufp);
 702                                 sflags |= SGF;
 703                                 sgflag &= ~GSG;         /* override GSG */
 704                                 break;
 705                         default:
 706                                 if (sflags) {
 707                                         errmsg = "invalid command suffix";
 708                                         return ERR;
 709                                 }
 710                         }
 711                 } while (sflags && *ibufp != '\n');
 712                 if (sflags && !pat) {
 713                         errmsg = "no previous substitution";
 714                         return ERR;
 715                 } else if (sflags & SGG)
 716                         sgnum = 0;              /* override numeric arg */
 717                 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
 718                         errmsg = "invalid pattern delimiter";
 719                         return ERR;
 720                 }
 721                 tpat = pat;
 722                 SPL1();
 723                 if ((!sflags || (sflags & SGR)) &&
 724                     (tpat = get_compiled_pattern()) == NULL) {
 725                         SPL0();
 726                         return ERR;
 727                 } else if (tpat != pat) {
 728                         if (pat) {
 729                                 regfree(pat);
 730                                 free(pat);
 731                         }
 732                         pat = tpat;
 733                         patlock = 1;            /* reserve pattern */
 734                 }
 735                 SPL0();
 736                 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
 737                         return ERR;
 738                 else if (isglobal)
 739                         sgflag |= GLB;
 740                 else
 741                         sgflag &= ~GLB;
 742                 if (sflags & SGG)
 743                         sgflag ^= GSG;
 744                 if (sflags & SGP)
 745                         sgflag ^= GPR, sgflag &= ~(GLS | GNP);
 746                 do {
 747                         switch(*ibufp) {
 748                         case 'p':
 749                                 sgflag |= GPR, ibufp++;
 750                                 break;
 751                         case 'l':
 752                                 sgflag |= GLS, ibufp++;
 753                                 break;
 754                         case 'n':
 755                                 sgflag |= GNP, ibufp++;
 756                                 break;
 757                         default:
 758                                 n++;
 759                         }
 760                 } while (!n);
 761                 if (check_addr_range(current_addr, current_addr) < 0)
 762                         return ERR;
 763                 GET_COMMAND_SUFFIX();
 764                 if (!isglobal) clear_undo_stack();
 765                 if (search_and_replace(pat, sgflag, sgnum) < 0)
 766                         return ERR;
 767                 break;
 768         case 't':
 769                 if (check_addr_range(current_addr, current_addr) < 0)
 770                         return ERR;
 771                 GET_THIRD_ADDR(addr);
 772                 GET_COMMAND_SUFFIX();
 773                 if (!isglobal) clear_undo_stack();
 774                 if (copy_lines(addr) < 0)
 775                         return ERR;
 776                 break;
 777         case 'u':
 778                 if (addr_cnt > 0) {
 779                         errmsg = "unexpected address";
 780                         return ERR;
 781                 }
 782                 GET_COMMAND_SUFFIX();
 783                 if (pop_undo_stack() < 0)
 784                         return ERR;
 785                 break;
 786         case 'w':
 787         case 'W':
 788                 if ((n = *ibufp) == 'q' || n == 'Q') {
 789                         gflag = EOF;
 790                         ibufp++;
 791                 }
 792                 if (!isspace((unsigned char)*ibufp)) {
 793                         errmsg = "unexpected command suffix";
 794                         return ERR;
 795                 } else if ((fnp = get_filename()) == NULL)
 796                         return ERR;
 797                 if (addr_cnt == 0 && !addr_last)
 798                         first_addr = second_addr = 0;
 799                 else if (check_addr_range(1, addr_last) < 0)
 800                         return ERR;
 801                 GET_COMMAND_SUFFIX();
 802                 if (*old_filename == '\0' && *fnp != '!')
 803                         strlcpy(old_filename, fnp, PATH_MAX);
 804 #ifdef BACKWARDS
 805                 if (*fnp == '\0' && *old_filename == '\0') {
 806                         errmsg = "no current filename";
 807                         return ERR;
 808                 }
 809 #endif
 810                 if ((addr = write_file(*fnp ? fnp : old_filename,
 811                     (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
 812                         return ERR;
 813                 else if (addr == addr_last && *fnp != '!')
 814                         modified = 0;
 815                 else if (modified && !scripted && n == 'q')
 816                         gflag = EMOD;
 817                 break;
 818         case 'x':
 819                 if (addr_cnt > 0) {
 820                         errmsg = "unexpected address";
 821                         return ERR;
 822                 }
 823                 GET_COMMAND_SUFFIX();
 824 #ifdef DES
 825                 des = get_keyword();
 826                 break;
 827 #else
 828                 errmsg = "crypt unavailable";
 829                 return ERR;
 830 #endif
 831         case 'z':
 832 #ifdef BACKWARDS
 833                 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
 834 #else
 835                 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
 836 #endif
 837                         return ERR;
 838                 else if ('0' < *ibufp && *ibufp <= '9')
 839                         STRTOL(rows, ibufp);
 840                 GET_COMMAND_SUFFIX();
 841                 if (display_lines(second_addr, min(addr_last,
 842                     second_addr + rows), gflag) < 0)
 843                         return ERR;
 844                 gflag = 0;
 845                 break;
 846         case '=':
 847                 GET_COMMAND_SUFFIX();
 848                 printf("%ld\n", addr_cnt ? second_addr : addr_last);
 849                 break;
 850         case '!':
 851                 if (addr_cnt > 0) {
 852                         errmsg = "unexpected address";
 853                         return ERR;
 854                 } else if ((sflags = get_shell_command()) < 0)
 855                         return ERR;
 856                 GET_COMMAND_SUFFIX();
 857                 if (sflags) printf("%s\n", shcmd + 1);
 858                 system(shcmd + 1);
 859                 if (!scripted) printf("!\n");
 860                 break;
 861         case '\n':
 862 #ifdef BACKWARDS
 863                 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
 864 #else
 865                 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
 866 #endif
 867                  || display_lines(second_addr, second_addr, 0) < 0)
 868                         return ERR;
 869                 break;
 870         default:
 871                 errmsg = "unknown command";
 872                 return ERR;
 873         }
 874         return gflag;
 875 }
 876
 877
 878 /* check_addr_range: return status of address range check */
 879 int
 880 check_addr_range(long n, long m)
 881 {
 882         if (addr_cnt == 0) {
 883                 first_addr = n;
 884                 second_addr = m;
 885         }
 886         if (first_addr > second_addr || 1 > first_addr ||
 887             second_addr > addr_last) {
 888                 errmsg = "invalid address";
 889                 return ERR;
 890         }
 891         return 0;
 892 }
 893
 894
 895 /* get_matching_node_addr: return the address of the next line matching a
 896    pattern in a given direction.  wrap around begin/end of editor buffer if
 897    necessary */
 898 long
 899 get_matching_node_addr(pattern_t *pat, int dir)
 900 {
 901         char *s;
 902         long n = current_addr;
 903         line_t *lp;
 904
 905         if (!pat) return ERR;
 906         do {
 907                if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
 908                         lp = get_addressed_line_node(n);
 909                         if ((s = get_sbuf_line(lp)) == NULL)
 910                                 return ERR;
 911                         if (isbinary)
 912                                 NUL_TO_NEWLINE(s, lp->len);
 913                         if (!regexec(pat, s, 0, NULL, 0))
 914                                 return n;
 915                }
 916         } while (n != current_addr);
 917         errmsg = "no match";
 918         return  ERR;
 919 }
 920
 921
 922 /* get_filename: return pointer to copy of filename in the command buffer */
 923 char *
 924 get_filename(void)
 925 {
 926         static char *file = NULL;
 927         static int filesz = 0;
 928
 929         int n;
 930
 931         if (*ibufp != '\n') {
 932                 SKIP_BLANKS();
 933                 if (*ibufp == '\n') {
 934                         errmsg = "invalid filename";
 935                         return NULL;
 936                 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
 937                         return NULL;
 938                 else if (*ibufp == '!') {
 939                         ibufp++;
 940                         if ((n = get_shell_command()) < 0)
 941                                 return NULL;
 942                         if (n)
 943                                 printf("%s\n", shcmd + 1);
 944                         return shcmd;
 945                 } else if (n > PATH_MAX - 1) {
 946                         errmsg = "filename too long";
 947                         return  NULL;
 948                 }
 949         }
 950 #ifndef BACKWARDS
 951         else if (*old_filename == '\0') {
 952                 errmsg = "no current filename";
 953                 return  NULL;
 954         }
 955 #endif
 956         REALLOC(file, filesz, PATH_MAX, NULL);
 957         for (n = 0; *ibufp != '\n';)
 958                 file[n++] = *ibufp++;
 959         file[n] = '\0';
 960         return is_legal_filename(file) ? file : NULL;
 961 }
 962
 963
 964 /* get_shell_command: read a shell command from stdin; return substitution
 965    status */
 966 int
 967 get_shell_command(void)
 968 {
 969         static char *buf = NULL;
 970         static int n = 0;
 971
 972         char *s;                        /* substitution char pointer */
 973         int i = 0;
 974         int j = 0;
 975
 976         if (red) {
 977                 errmsg = "shell access restricted";
 978                 return ERR;
 979         } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
 980                 return ERR;
 981         REALLOC(buf, n, j + 1, ERR);
 982         buf[i++] = '!';                 /* prefix command w/ bang */
 983         while (*ibufp != '\n')
 984                 switch (*ibufp) {
 985                 default:
 986                         REALLOC(buf, n, i + 2, ERR);
 987                         buf[i++] = *ibufp;
 988                         if (*ibufp++ == '\\')
 989                                 buf[i++] = *ibufp++;
 990                         break;
 991                 case '!':
 992                         if (s != ibufp) {
 993                                 REALLOC(buf, n, i + 1, ERR);
 994                                 buf[i++] = *ibufp++;
 995                         }
 996 #ifdef BACKWARDS
 997                         else if (shcmd == NULL || *(shcmd + 1) == '\0')
 998 #else
 999                         else if (shcmd == NULL)
1000 #endif
1001                         {
1002                                 errmsg = "no previous command";
1003                                 return ERR;
1004                         } else {
1005                                 REALLOC(buf, n, i + shcmdi, ERR);
1006                                 for (s = shcmd + 1; s < shcmd + shcmdi;)
1007                                         buf[i++] = *s++;
1008                                 s = ibufp++;
1009                         }
1010                         break;
1011                 case '%':
1012                         if (*old_filename  == '\0') {
1013                                 errmsg = "no current filename";
1014                                 return ERR;
1015                         }
1016                         j = strlen(s = strip_escapes(old_filename));
1017                         REALLOC(buf, n, i + j, ERR);
1018                         while (j--)
1019                                 buf[i++] = *s++;
1020                         s = ibufp++;
1021                         break;
1022                 }
1023         REALLOC(shcmd, shcmdsz, i + 1, ERR);
1024         memcpy(shcmd, buf, i);
1025         shcmd[shcmdi = i] = '\0';
1026         return *s == '!' || *s == '%';
1027 }
1028
1029
1030 /* append_lines: insert text from stdin to after line n; stop when either a
1031    single period is read or EOF; return status */
1032 int
1033 append_lines(long n)
1034 {
1035         int l;
1036         const char *lp = ibuf;
1037         const char *eot;
1038         undo_t *up = NULL;
1039
1040         for (current_addr = n;;) {
1041                 if (!isglobal) {
1042                         if ((l = get_tty_line()) < 0)
1043                                 return ERR;
1044                         else if (l == 0 || ibuf[l - 1] != '\n') {
1045                                 clearerr(stdin);
1046                                 return  l ? EOF : 0;
1047                         }
1048                         lp = ibuf;
1049                 } else if (*(lp = ibufp) == '\0')
1050                         return 0;
1051                 else {
1052                         while (*ibufp++ != '\n')
1053                                 ;
1054                         l = ibufp - lp;
1055                 }
1056                 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1057                         return 0;
1058                 }
1059                 eot = lp + l;
1060                 SPL1();
1061                 do {
1062                         if ((lp = put_sbuf_line(lp)) == NULL) {
1063                                 SPL0();
1064                                 return ERR;
1065                         } else if (up)
1066                                 up->t = get_addressed_line_node(current_addr);
1067                         else if ((up = push_undo_stack(UADD, current_addr,
1068                             current_addr)) == NULL) {
1069                                 SPL0();
1070                                 return ERR;
1071                         }
1072                 } while (lp != eot);
1073                 modified = 1;
1074                 SPL0();
1075         }
1076         /* NOTREACHED */
1077 }
1078
1079
1080 /* join_lines: replace a range of lines with the joined text of those lines */
1081 int
1082 join_lines(long from, long to)
1083 {
1084         static char *buf = NULL;
1085         static int n;
1086
1087         char *s;
1088         int size = 0;
1089         line_t *bp, *ep;
1090
1091         ep = get_addressed_line_node(INC_MOD(to, addr_last));
1092         bp = get_addressed_line_node(from);
1093         for (; bp != ep; bp = bp->q_forw) {
1094                 if ((s = get_sbuf_line(bp)) == NULL)
1095                         return ERR;
1096                 REALLOC(buf, n, size + bp->len, ERR);
1097                 memcpy(buf + size, s, bp->len);
1098                 size += bp->len;
1099         }
1100         REALLOC(buf, n, size + 2, ERR);
1101         memcpy(buf + size, "\n", 2);
1102         if (delete_lines(from, to) < 0)
1103                 return ERR;
1104         current_addr = from - 1;
1105         SPL1();
1106         if (put_sbuf_line(buf) == NULL ||
1107             push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1108                 SPL0();
1109                 return ERR;
1110         }
1111         modified = 1;
1112         SPL0();
1113         return 0;
1114 }
1115
1116
1117 /* move_lines: move a range of lines */
1118 int
1119 move_lines(long addr)
1120 {
1121         line_t *b1, *a1, *b2, *a2;
1122         long n = INC_MOD(second_addr, addr_last);
1123         long p = first_addr - 1;
1124         int done = (addr == first_addr - 1 || addr == second_addr);
1125
1126         SPL1();
1127         if (done) {
1128                 a2 = get_addressed_line_node(n);
1129                 b2 = get_addressed_line_node(p);
1130                 current_addr = second_addr;
1131         } else if (push_undo_stack(UMOV, p, n) == NULL ||
1132             push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1133                 SPL0();
1134                 return ERR;
1135         } else {
1136                 a1 = get_addressed_line_node(n);
1137                 if (addr < first_addr) {
1138                         b1 = get_addressed_line_node(p);
1139                         b2 = get_addressed_line_node(addr);
1140                                         /* this get_addressed_line_node last! */
1141                 } else {
1142                         b2 = get_addressed_line_node(addr);
1143                         b1 = get_addressed_line_node(p);
1144                                         /* this get_addressed_line_node last! */
1145                 }
1146                 a2 = b2->q_forw;
1147                 REQUE(b2, b1->q_forw);
1148                 REQUE(a1->q_back, a2);
1149                 REQUE(b1, a1);
1150                 current_addr = addr + ((addr < first_addr) ?
1151                     second_addr - first_addr + 1 : 0);
1152         }
1153         if (isglobal)
1154                 unset_active_nodes(b2->q_forw, a2);
1155         modified = 1;
1156         SPL0();
1157         return 0;
1158 }
1159
1160
1161 /* copy_lines: copy a range of lines; return status */
1162 int
1163 copy_lines(long addr)
1164 {
1165         line_t *lp, *np = get_addressed_line_node(first_addr);
1166         undo_t *up = NULL;
1167         long n = second_addr - first_addr + 1;
1168         long m = 0;
1169
1170         current_addr = addr;
1171         if (first_addr <= addr && addr < second_addr) {
1172                 n =  addr - first_addr + 1;
1173                 m = second_addr - addr;
1174         }
1175         for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1176                 for (; n-- > 0; np = np->q_forw) {
1177                         SPL1();
1178                         if ((lp = dup_line_node(np)) == NULL) {
1179                                 SPL0();
1180                                 return ERR;
1181                         }
1182                         add_line_node(lp);
1183                         if (up)
1184                                 up->t = lp;
1185                         else if ((up = push_undo_stack(UADD, current_addr,
1186                             current_addr)) == NULL) {
1187                                 SPL0();
1188                                 return ERR;
1189                         }
1190                         modified = 1;
1191                         SPL0();
1192                 }
1193         return 0;
1194 }
1195
1196
1197 /* delete_lines: delete a range of lines */
1198 int
1199 delete_lines(long from, long to)
1200 {
1201         line_t *n, *p;
1202
1203         SPL1();
1204         if (push_undo_stack(UDEL, from, to) == NULL) {
1205                 SPL0();
1206                 return ERR;
1207         }
1208         n = get_addressed_line_node(INC_MOD(to, addr_last));
1209         p = get_addressed_line_node(from - 1);
1210                                         /* this get_addressed_line_node last! */
1211         if (isglobal)
1212                 unset_active_nodes(p->q_forw, n);
1213         REQUE(p, n);
1214         addr_last -= to - from + 1;
1215         current_addr = from - 1;
1216         modified = 1;
1217         SPL0();
1218         return 0;
1219 }
1220
1221
1222 /* display_lines: print a range of lines to stdout */
1223 int
1224 display_lines(long from, long to, int gflag)
1225 {
1226         line_t *bp;
1227         line_t *ep;
1228         char *s;
1229
1230         if (!from) {
1231                 errmsg = "invalid address";
1232                 return ERR;
1233         }
1234         ep = get_addressed_line_node(INC_MOD(to, addr_last));
1235         bp = get_addressed_line_node(from);
1236         for (; bp != ep; bp = bp->q_forw) {
1237                 if ((s = get_sbuf_line(bp)) == NULL)
1238                         return ERR;
1239                 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1240                         return ERR;
1241         }
1242         return 0;
1243 }
1244
1245
1246 #define MAXMARK 26                      /* max number of marks */
1247
1248 static line_t *mark[MAXMARK];           /* line markers */
1249 static int markno;                      /* line marker count */
1250
1251 /* mark_line_node: set a line node mark */
1252 int
1253 mark_line_node(line_t *lp, int n)
1254 {
1255         if (!islower((unsigned char)n)) {
1256                 errmsg = "invalid mark character";
1257                 return ERR;
1258         } else if (mark[n - 'a'] == NULL)
1259                 markno++;
1260         mark[n - 'a'] = lp;
1261         return 0;
1262 }
1263
1264
1265 /* get_marked_node_addr: return address of a marked line */
1266 long
1267 get_marked_node_addr(int n)
1268 {
1269         if (!islower((unsigned char)n)) {
1270                 errmsg = "invalid mark character";
1271                 return ERR;
1272         }
1273         return get_line_node_addr(mark[n - 'a']);
1274 }
1275
1276
1277 /* unmark_line_node: clear line node mark */
1278 void
1279 unmark_line_node(line_t *lp)
1280 {
1281         int i;
1282
1283         for (i = 0; markno && i < MAXMARK; i++)
1284                 if (mark[i] == lp) {
1285                         mark[i] = NULL;
1286                         markno--;
1287                 }
1288 }
1289
1290
1291 /* dup_line_node: return a pointer to a copy of a line node */
1292 line_t *
1293 dup_line_node(line_t *lp)
1294 {
1295         line_t *np;
1296
1297         if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1298                 fprintf(stderr, "%s\n", strerror(errno));
1299                 errmsg = "out of memory";
1300                 return NULL;
1301         }
1302         np->seek = lp->seek;
1303         np->len = lp->len;
1304         return np;
1305 }
1306
1307
1308 /* has_trailing_escape:  return the parity of escapes preceding a character
1309    in a string */
1310 int
1311 has_trailing_escape(char *s, char *t)
1312 {
1313     return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1314 }
1315
1316
1317 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1318 char *
1319 strip_escapes(char *s)
1320 {
1321         static char *file = NULL;
1322         static int filesz = 0;
1323
1324         int i = 0;
1325
1326         REALLOC(file, filesz, PATH_MAX, NULL);
1327         while (i < filesz - 1   /* Worry about a possible trailing escape */
1328                && (file[i++] = (*s == '\\') ? *++s : *s))
1329                 s++;
1330         return file;
1331 }
1332
1333
1334 void
1335 signal_hup(int signo)
1336 {
1337         if (mutex)
1338                 sigflags |= (1 << (signo - 1));
1339         else
1340                 handle_hup(signo);
1341 }
1342
1343
1344 void
1345 signal_int(int signo)
1346 {
1347         if (mutex)
1348                 sigflags |= (1 << (signo - 1));
1349         else
1350                 handle_int(signo);
1351 }
1352
1353
1354 void
1355 handle_hup(int signo)
1356 {
1357         char *hup = NULL;               /* hup filename */
1358         char *s;
1359         char ed_hup[] = "ed.hup";
1360         size_t n;
1361
1362         if (!sigactive)
1363                 quit(1);
1364         sigflags &= ~(1 << (signo - 1));
1365         if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
1366             (s = getenv("HOME")) != NULL &&
1367             (n = strlen(s)) + 8 <= PATH_MAX &&  /* "ed.hup" + '/' */
1368             (hup = (char *) malloc(n + 10)) != NULL) {
1369                 strcpy(hup, s);
1370                 if (hup[n - 1] != '/')
1371                         hup[n] = '/', hup[n+1] = '\0';
1372                 strcat(hup, "ed.hup");
1373                 write_file(hup, "w", 1, addr_last);
1374         }
1375         quit(2);
1376 }
1377
1378
1379 void
1380 handle_int(int signo)
1381 {
1382         if (!sigactive)
1383                 quit(1);
1384         sigflags &= ~(1 << (signo - 1));
1385 #ifdef _POSIX_SOURCE
1386         siglongjmp(env, -1);
1387 #else
1388         longjmp(env, -1);
1389 #endif
1390 }
1391
1392
1393 int cols = 72;                          /* wrap column */
1394
1395 void
1396 handle_winch(int signo)
1397 {
1398         int save_errno = errno;
1399
1400         struct winsize ws;              /* window size structure */
1401
1402         sigflags &= ~(1 << (signo - 1));
1403         if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1404                 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1405                 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1406         }
1407         errno = save_errno;
1408 }
1409
1410
1411 /* is_legal_filename: return a legal filename */
1412 int
1413 is_legal_filename(char *s)
1414 {
1415         if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1416                 errmsg = "shell access restricted";
1417                 return 0;
1418         }
1419         return 1;
1420 }