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 static char * const copyright = 31 "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\ 32 All rights reserved.\n"; 33 #endif /* not lint */ 34 35 #ifndef lint 36 #if 0 37 static char * const rcsid = "@(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp"; 38 #else 39 static char * const rcsid = 40 "$FreeBSD$"; 41 #endif 42 #endif /* not lint */ 43 44 /* 45 * CREDITS 46 * 47 * This program is based on the editor algorithm described in 48 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 49 * in Pascal," Addison-Wesley, 1981. 50 * 51 * The buffering algorithm is attributed to Rodney Ruddock of 52 * the University of Guelph, Guelph, Ontario. 53 * 54 * The cbc.c encryption code is adapted from 55 * the bdes program by Matt Bishop of Dartmouth College, 56 * Hanover, NH. 57 * 58 */ 59 60 #include <sys/types.h> 61 62 #include <sys/ioctl.h> 63 #include <sys/wait.h> 64 #include <ctype.h> 65 #include <locale.h> 66 #include <pwd.h> 67 #include <setjmp.h> 68 69 #include "ed.h" 70 71 72 #ifdef _POSIX_SOURCE 73 sigjmp_buf env; 74 #else 75 jmp_buf env; 76 #endif 77 78 /* static buffers */ 79 char stdinbuf[1]; /* stdin buffer */ 80 char *shcmd; /* shell command buffer */ 81 int shcmdsz; /* shell command buffer size */ 82 int shcmdi; /* shell command buffer index */ 83 char *ibuf; /* ed command-line buffer */ 84 int ibufsz; /* ed command-line buffer size */ 85 char *ibufp; /* pointer to ed command-line buffer */ 86 87 /* global flags */ 88 int des = 0; /* if set, use crypt(3) for i/o */ 89 int garrulous = 0; /* if set, print all error messages */ 90 int isbinary; /* if set, buffer contains ASCII NULs */ 91 int isglobal; /* if set, doing a global command */ 92 int modified; /* if set, buffer modified since last write */ 93 int mutex = 0; /* if set, signals set "sigflags" */ 94 int red = 0; /* if set, restrict shell/directory access */ 95 int scripted = 0; /* if set, suppress diagnostics */ 96 int sigflags = 0; /* if set, signals received while mutex set */ 97 int sigactive = 0; /* if set, signal handlers are enabled */ 98 99 char old_filename[MAXPATHLEN + 1] = ""; /* default filename */ 100 long current_addr; /* current address in editor buffer */ 101 long addr_last; /* last address in editor buffer */ 102 int lineno; /* script line number */ 103 char *prompt; /* command-line prompt */ 104 char *dps = "*"; /* default command-line prompt */ 105 106 const char usage[] = "usage: %s [-] [-sx] [-p string] [name]\n"; 107 108 /* ed: line editor */ 109 int 110 main(argc, argv) 111 int argc; 112 char **argv; 113 { 114 int c, n; 115 long status = 0; 116 #if __GNUC__ 117 /* Avoid longjmp clobbering */ 118 (void) &argc; 119 (void) &argv; 120 #endif 121 122 (void)setlocale(LC_ALL, ""); 123 124 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 125 top: 126 while ((c = getopt(argc, argv, "p:sx")) != -1) 127 switch(c) { 128 case 'p': /* set prompt */ 129 prompt = optarg; 130 break; 131 case 's': /* run script */ 132 scripted = 1; 133 break; 134 case 'x': /* use crypt */ 135 #ifdef DES 136 des = get_keyword(); 137 #else 138 fprintf(stderr, "crypt unavailable\n?\n"); 139 #endif 140 break; 141 142 default: 143 fprintf(stderr, usage, argv[0]); 144 exit(1); 145 } 146 argv += optind; 147 argc -= optind; 148 if (argc && **argv == '-') { 149 scripted = 1; 150 if (argc > 1) { 151 optind = 1; 152 goto top; 153 } 154 argv++; 155 argc--; 156 } 157 /* assert: reliable signals! */ 158 #ifdef SIGWINCH 159 handle_winch(SIGWINCH); 160 if (isatty(0)) signal(SIGWINCH, handle_winch); 161 #endif 162 signal(SIGHUP, signal_hup); 163 signal(SIGQUIT, SIG_IGN); 164 signal(SIGINT, signal_int); 165 #ifdef _POSIX_SOURCE 166 if ((status = sigsetjmp(env, 1))) 167 #else 168 if ((status = setjmp(env))) 169 #endif 170 { 171 fputs("\n?\n", stderr); 172 sprintf(errmsg, "interrupt"); 173 } else { 174 init_buffers(); 175 sigactive = 1; /* enable signal handlers */ 176 if (argc && **argv && is_legal_filename(*argv)) { 177 if (read_file(*argv, 0) < 0 && !isatty(0)) 178 quit(2); 179 else if (**argv != '!') 180 if (strlcpy(old_filename, *argv, sizeof(old_filename)) 181 >= sizeof(old_filename)) 182 quit(2); 183 } else if (argc) { 184 fputs("?\n", stderr); 185 if (**argv == '\0') 186 sprintf(errmsg, "invalid filename"); 187 if (!isatty(0)) 188 quit(2); 189 } 190 } 191 for (;;) { 192 if (status < 0 && garrulous) 193 fprintf(stderr, "%s\n", errmsg); 194 if (prompt) { 195 printf("%s", prompt); 196 fflush(stdout); 197 } 198 if ((n = get_tty_line()) < 0) { 199 status = ERR; 200 continue; 201 } else if (n == 0) { 202 if (modified && !scripted) { 203 fputs("?\n", stderr); 204 sprintf(errmsg, "warning: file modified"); 205 if (!isatty(0)) { 206 fprintf(stderr, garrulous ? 207 "script, line %d: %s\n" : 208 "", lineno, errmsg); 209 quit(2); 210 } 211 clearerr(stdin); 212 modified = 0; 213 status = EMOD; 214 continue; 215 } else 216 quit(0); 217 } else if (ibuf[n - 1] != '\n') { 218 /* discard line */ 219 sprintf(errmsg, "unexpected end-of-file"); 220 clearerr(stdin); 221 status = ERR; 222 continue; 223 } 224 isglobal = 0; 225 if ((status = extract_addr_range()) >= 0 && 226 (status = exec_command()) >= 0) 227 if (!status || 228 (status = display_lines(current_addr, current_addr, 229 status)) >= 0) 230 continue; 231 switch (status) { 232 case EOF: 233 quit(0); 234 case EMOD: 235 modified = 0; 236 fputs("?\n", stderr); /* give warning */ 237 sprintf(errmsg, "warning: file modified"); 238 if (!isatty(0)) { 239 fprintf(stderr, garrulous ? 240 "script, line %d: %s\n" : 241 "", lineno, errmsg); 242 quit(2); 243 } 244 break; 245 case FATAL: 246 if (!isatty(0)) 247 fprintf(stderr, garrulous ? 248 "script, line %d: %s\n" : "", 249 lineno, errmsg); 250 else 251 fprintf(stderr, garrulous ? "%s\n" : "", 252 errmsg); 253 quit(3); 254 default: 255 fputs("?\n", stderr); 256 if (!isatty(0)) { 257 fprintf(stderr, garrulous ? 258 "script, line %d: %s\n" : "", 259 lineno, errmsg); 260 quit(2); 261 } 262 break; 263 } 264 } 265 /*NOTREACHED*/ 266 } 267 268 long first_addr, second_addr, addr_cnt; 269 270 /* extract_addr_range: get line addresses from the command buffer until an 271 illegal address is seen; return status */ 272 int 273 extract_addr_range() 274 { 275 long addr; 276 277 addr_cnt = 0; 278 first_addr = second_addr = current_addr; 279 while ((addr = next_addr()) >= 0) { 280 addr_cnt++; 281 first_addr = second_addr; 282 second_addr = addr; 283 if (*ibufp != ',' && *ibufp != ';') 284 break; 285 else if (*ibufp++ == ';') 286 current_addr = addr; 287 } 288 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 289 first_addr = second_addr; 290 return (addr == ERR) ? ERR : 0; 291 } 292 293 294 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++ 295 296 #define MUST_BE_FIRST() \ 297 if (!first) { sprintf(errmsg, "invalid address"); return ERR; } 298 299 /* next_addr: return the next line address in the command buffer */ 300 long 301 next_addr() 302 { 303 char *hd; 304 long addr = current_addr; 305 long n; 306 int first = 1; 307 int c; 308 309 SKIP_BLANKS(); 310 for (hd = ibufp;; first = 0) 311 switch (c = *ibufp) { 312 case '+': 313 case '\t': 314 case ' ': 315 case '-': 316 case '^': 317 ibufp++; 318 SKIP_BLANKS(); 319 if (isdigit((unsigned char)*ibufp)) { 320 STRTOL(n, ibufp); 321 addr += (c == '-' || c == '^') ? -n : n; 322 } else if (!isspace((unsigned char)c)) 323 addr += (c == '-' || c == '^') ? -1 : 1; 324 break; 325 case '0': case '1': case '2': 326 case '3': case '4': case '5': 327 case '6': case '7': case '8': case '9': 328 MUST_BE_FIRST(); 329 STRTOL(addr, ibufp); 330 break; 331 case '.': 332 case '$': 333 MUST_BE_FIRST(); 334 ibufp++; 335 addr = (c == '.') ? current_addr : addr_last; 336 break; 337 case '/': 338 case '?': 339 MUST_BE_FIRST(); 340 if ((addr = get_matching_node_addr( 341 get_compiled_pattern(), c == '/')) < 0) 342 return ERR; 343 else if (c == *ibufp) 344 ibufp++; 345 break; 346 case '\'': 347 MUST_BE_FIRST(); 348 ibufp++; 349 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 350 return ERR; 351 break; 352 case '%': 353 case ',': 354 case ';': 355 if (first) { 356 ibufp++; 357 addr_cnt++; 358 second_addr = (c == ';') ? current_addr : 1; 359 addr = addr_last; 360 break; 361 } 362 /* FALL THROUGH */ 363 default: 364 if (ibufp == hd) 365 return EOF; 366 else if (addr < 0 || addr_last < addr) { 367 sprintf(errmsg, "invalid address"); 368 return ERR; 369 } else 370 return addr; 371 } 372 /* NOTREACHED */ 373 } 374 375 376 #ifdef BACKWARDS 377 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 378 #define GET_THIRD_ADDR(addr) \ 379 { \ 380 long ol1, ol2; \ 381 \ 382 ol1 = first_addr, ol2 = second_addr; \ 383 if (extract_addr_range() < 0) \ 384 return ERR; \ 385 else if (addr_cnt == 0) { \ 386 sprintf(errmsg, "destination expected"); \ 387 return ERR; \ 388 } else if (second_addr < 0 || addr_last < second_addr) { \ 389 sprintf(errmsg, "invalid address"); \ 390 return ERR; \ 391 } \ 392 addr = second_addr; \ 393 first_addr = ol1, second_addr = ol2; \ 394 } 395 #else /* BACKWARDS */ 396 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 397 #define GET_THIRD_ADDR(addr) \ 398 { \ 399 long ol1, ol2; \ 400 \ 401 ol1 = first_addr, ol2 = second_addr; \ 402 if (extract_addr_range() < 0) \ 403 return ERR; \ 404 if (second_addr < 0 || addr_last < second_addr) { \ 405 sprintf(errmsg, "invalid address"); \ 406 return ERR; \ 407 } \ 408 addr = second_addr; \ 409 first_addr = ol1, second_addr = ol2; \ 410 } 411 #endif 412 413 414 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 415 #define GET_COMMAND_SUFFIX() { \ 416 int done = 0; \ 417 do { \ 418 switch(*ibufp) { \ 419 case 'p': \ 420 gflag |= GPR, ibufp++; \ 421 break; \ 422 case 'l': \ 423 gflag |= GLS, ibufp++; \ 424 break; \ 425 case 'n': \ 426 gflag |= GNP, ibufp++; \ 427 break; \ 428 default: \ 429 done++; \ 430 } \ 431 } while (!done); \ 432 if (*ibufp++ != '\n') { \ 433 sprintf(errmsg, "invalid command suffix"); \ 434 return ERR; \ 435 } \ 436 } 437 438 439 /* sflags */ 440 #define SGG 001 /* complement previous global substitute suffix */ 441 #define SGP 002 /* complement previous print suffix */ 442 #define SGR 004 /* use last regex instead of last pat */ 443 #define SGF 010 /* repeat last substitution */ 444 445 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 446 447 long rows = 22; /* scroll length: ws_row - 2 */ 448 449 /* exec_command: execute the next command in command buffer; return print 450 request, if any */ 451 int 452 exec_command() 453 { 454 extern long u_current_addr; 455 extern long u_addr_last; 456 457 static pattern_t *pat = NULL; 458 static int sgflag = 0; 459 static long sgnum = 0; 460 461 pattern_t *tpat; 462 char *fnp; 463 int gflag = 0; 464 int sflags = 0; 465 long addr = 0; 466 int n = 0; 467 int c; 468 469 SKIP_BLANKS(); 470 switch(c = *ibufp++) { 471 case 'a': 472 GET_COMMAND_SUFFIX(); 473 if (!isglobal) clear_undo_stack(); 474 if (append_lines(second_addr) < 0) 475 return ERR; 476 break; 477 case 'c': 478 if (check_addr_range(current_addr, current_addr) < 0) 479 return ERR; 480 GET_COMMAND_SUFFIX(); 481 if (!isglobal) clear_undo_stack(); 482 if (delete_lines(first_addr, second_addr) < 0 || 483 append_lines(current_addr) < 0) 484 return ERR; 485 break; 486 case 'd': 487 if (check_addr_range(current_addr, current_addr) < 0) 488 return ERR; 489 GET_COMMAND_SUFFIX(); 490 if (!isglobal) clear_undo_stack(); 491 if (delete_lines(first_addr, second_addr) < 0) 492 return ERR; 493 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 494 current_addr = addr; 495 break; 496 case 'e': 497 if (modified && !scripted) 498 return EMOD; 499 /* fall through */ 500 case 'E': 501 if (addr_cnt > 0) { 502 sprintf(errmsg, "unexpected address"); 503 return ERR; 504 } else if (!isspace((unsigned char)*ibufp)) { 505 sprintf(errmsg, "unexpected command suffix"); 506 return ERR; 507 } else if ((fnp = get_filename()) == NULL) 508 return ERR; 509 GET_COMMAND_SUFFIX(); 510 if (delete_lines(1, addr_last) < 0) 511 return ERR; 512 clear_undo_stack(); 513 if (close_sbuf() < 0) 514 return ERR; 515 else if (open_sbuf() < 0) 516 return FATAL; 517 if (*fnp && *fnp != '!') strcpy(old_filename, fnp); 518 #ifdef BACKWARDS 519 if (*fnp == '\0' && *old_filename == '\0') { 520 sprintf(errmsg, "no current filename"); 521 return ERR; 522 } 523 #endif 524 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 525 return ERR; 526 clear_undo_stack(); 527 modified = 0; 528 u_current_addr = u_addr_last = -1; 529 break; 530 case 'f': 531 if (addr_cnt > 0) { 532 sprintf(errmsg, "unexpected address"); 533 return ERR; 534 } else if (!isspace((unsigned char)*ibufp)) { 535 sprintf(errmsg, "unexpected command suffix"); 536 return ERR; 537 } else if ((fnp = get_filename()) == NULL) 538 return ERR; 539 else if (*fnp == '!') { 540 sprintf(errmsg, "invalid redirection"); 541 return ERR; 542 } 543 GET_COMMAND_SUFFIX(); 544 if (*fnp) strcpy(old_filename, fnp); 545 printf("%s\n", strip_escapes(old_filename)); 546 break; 547 case 'g': 548 case 'v': 549 case 'G': 550 case 'V': 551 if (isglobal) { 552 sprintf(errmsg, "cannot nest global commands"); 553 return ERR; 554 } else if (check_addr_range(1, addr_last) < 0) 555 return ERR; 556 else if (build_active_list(c == 'g' || c == 'G') < 0) 557 return ERR; 558 else if ((n = (c == 'G' || c == 'V'))) 559 GET_COMMAND_SUFFIX(); 560 isglobal++; 561 if (exec_global(n, gflag) < 0) 562 return ERR; 563 break; 564 case 'h': 565 if (addr_cnt > 0) { 566 sprintf(errmsg, "unexpected address"); 567 return ERR; 568 } 569 GET_COMMAND_SUFFIX(); 570 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 571 break; 572 case 'H': 573 if (addr_cnt > 0) { 574 sprintf(errmsg, "unexpected address"); 575 return ERR; 576 } 577 GET_COMMAND_SUFFIX(); 578 if ((garrulous = 1 - garrulous) && *errmsg) 579 fprintf(stderr, "%s\n", errmsg); 580 break; 581 case 'i': 582 if (second_addr == 0) { 583 sprintf(errmsg, "invalid address"); 584 return ERR; 585 } 586 GET_COMMAND_SUFFIX(); 587 if (!isglobal) clear_undo_stack(); 588 if (append_lines(second_addr - 1) < 0) 589 return ERR; 590 break; 591 case 'j': 592 if (check_addr_range(current_addr, current_addr + 1) < 0) 593 return ERR; 594 GET_COMMAND_SUFFIX(); 595 if (!isglobal) clear_undo_stack(); 596 if (first_addr != second_addr && 597 join_lines(first_addr, second_addr) < 0) 598 return ERR; 599 break; 600 case 'k': 601 c = *ibufp++; 602 if (second_addr == 0) { 603 sprintf(errmsg, "invalid address"); 604 return ERR; 605 } 606 GET_COMMAND_SUFFIX(); 607 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 608 return ERR; 609 break; 610 case 'l': 611 if (check_addr_range(current_addr, current_addr) < 0) 612 return ERR; 613 GET_COMMAND_SUFFIX(); 614 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 615 return ERR; 616 gflag = 0; 617 break; 618 case 'm': 619 if (check_addr_range(current_addr, current_addr) < 0) 620 return ERR; 621 GET_THIRD_ADDR(addr); 622 if (first_addr <= addr && addr < second_addr) { 623 sprintf(errmsg, "invalid destination"); 624 return ERR; 625 } 626 GET_COMMAND_SUFFIX(); 627 if (!isglobal) clear_undo_stack(); 628 if (move_lines(addr) < 0) 629 return ERR; 630 break; 631 case 'n': 632 if (check_addr_range(current_addr, current_addr) < 0) 633 return ERR; 634 GET_COMMAND_SUFFIX(); 635 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 636 return ERR; 637 gflag = 0; 638 break; 639 case 'p': 640 if (check_addr_range(current_addr, current_addr) < 0) 641 return ERR; 642 GET_COMMAND_SUFFIX(); 643 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 644 return ERR; 645 gflag = 0; 646 break; 647 case 'P': 648 if (addr_cnt > 0) { 649 sprintf(errmsg, "unexpected address"); 650 return ERR; 651 } 652 GET_COMMAND_SUFFIX(); 653 prompt = prompt ? NULL : optarg ? optarg : dps; 654 break; 655 case 'q': 656 case 'Q': 657 if (addr_cnt > 0) { 658 sprintf(errmsg, "unexpected address"); 659 return ERR; 660 } 661 GET_COMMAND_SUFFIX(); 662 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 663 break; 664 case 'r': 665 if (!isspace((unsigned char)*ibufp)) { 666 sprintf(errmsg, "unexpected command suffix"); 667 return ERR; 668 } else if (addr_cnt == 0) 669 second_addr = addr_last; 670 if ((fnp = get_filename()) == NULL) 671 return ERR; 672 GET_COMMAND_SUFFIX(); 673 if (!isglobal) clear_undo_stack(); 674 if (*old_filename == '\0' && *fnp != '!') 675 strcpy(old_filename, fnp); 676 #ifdef BACKWARDS 677 if (*fnp == '\0' && *old_filename == '\0') { 678 sprintf(errmsg, "no current filename"); 679 return ERR; 680 } 681 #endif 682 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 683 return ERR; 684 else if (addr && addr != addr_last) 685 modified = 1; 686 break; 687 case 's': 688 do { 689 switch(*ibufp) { 690 case '\n': 691 sflags |=SGF; 692 break; 693 case 'g': 694 sflags |= SGG; 695 ibufp++; 696 break; 697 case 'p': 698 sflags |= SGP; 699 ibufp++; 700 break; 701 case 'r': 702 sflags |= SGR; 703 ibufp++; 704 break; 705 case '0': case '1': case '2': case '3': case '4': 706 case '5': case '6': case '7': case '8': case '9': 707 STRTOL(sgnum, ibufp); 708 sflags |= SGF; 709 sgflag &= ~GSG; /* override GSG */ 710 break; 711 default: 712 if (sflags) { 713 sprintf(errmsg, "invalid command suffix"); 714 return ERR; 715 } 716 } 717 } while (sflags && *ibufp != '\n'); 718 if (sflags && !pat) { 719 sprintf(errmsg, "no previous substitution"); 720 return ERR; 721 } else if (sflags & SGG) 722 sgnum = 0; /* override numeric arg */ 723 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 724 sprintf(errmsg, "invalid pattern delimiter"); 725 return ERR; 726 } 727 tpat = pat; 728 SPL1(); 729 if ((!sflags || (sflags & SGR)) && 730 (tpat = get_compiled_pattern()) == NULL) { 731 SPL0(); 732 return ERR; 733 } else if (tpat != pat) { 734 if (pat) { 735 regfree(pat); 736 free(pat); 737 } 738 pat = tpat; 739 patlock = 1; /* reserve pattern */ 740 } 741 SPL0(); 742 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 743 return ERR; 744 else if (isglobal) 745 sgflag |= GLB; 746 else 747 sgflag &= ~GLB; 748 if (sflags & SGG) 749 sgflag ^= GSG; 750 if (sflags & SGP) 751 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 752 do { 753 switch(*ibufp) { 754 case 'p': 755 sgflag |= GPR, ibufp++; 756 break; 757 case 'l': 758 sgflag |= GLS, ibufp++; 759 break; 760 case 'n': 761 sgflag |= GNP, ibufp++; 762 break; 763 default: 764 n++; 765 } 766 } while (!n); 767 if (check_addr_range(current_addr, current_addr) < 0) 768 return ERR; 769 GET_COMMAND_SUFFIX(); 770 if (!isglobal) clear_undo_stack(); 771 if (search_and_replace(pat, sgflag, sgnum) < 0) 772 return ERR; 773 break; 774 case 't': 775 if (check_addr_range(current_addr, current_addr) < 0) 776 return ERR; 777 GET_THIRD_ADDR(addr); 778 GET_COMMAND_SUFFIX(); 779 if (!isglobal) clear_undo_stack(); 780 if (copy_lines(addr) < 0) 781 return ERR; 782 break; 783 case 'u': 784 if (addr_cnt > 0) { 785 sprintf(errmsg, "unexpected address"); 786 return ERR; 787 } 788 GET_COMMAND_SUFFIX(); 789 if (pop_undo_stack() < 0) 790 return ERR; 791 break; 792 case 'w': 793 case 'W': 794 if ((n = *ibufp) == 'q' || n == 'Q') { 795 gflag = EOF; 796 ibufp++; 797 } 798 if (!isspace((unsigned char)*ibufp)) { 799 sprintf(errmsg, "unexpected command suffix"); 800 return ERR; 801 } else if ((fnp = get_filename()) == NULL) 802 return ERR; 803 if (addr_cnt == 0 && !addr_last) 804 first_addr = second_addr = 0; 805 else if (check_addr_range(1, addr_last) < 0) 806 return ERR; 807 GET_COMMAND_SUFFIX(); 808 if (*old_filename == '\0' && *fnp != '!') 809 strcpy(old_filename, fnp); 810 #ifdef BACKWARDS 811 if (*fnp == '\0' && *old_filename == '\0') { 812 sprintf(errmsg, "no current filename"); 813 return ERR; 814 } 815 #endif 816 if ((addr = write_file(*fnp ? fnp : old_filename, 817 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 818 return ERR; 819 else if (addr == addr_last) 820 modified = 0; 821 else if (modified && !scripted && n == 'q') 822 gflag = EMOD; 823 break; 824 case 'x': 825 if (addr_cnt > 0) { 826 sprintf(errmsg, "unexpected address"); 827 return ERR; 828 } 829 GET_COMMAND_SUFFIX(); 830 #ifdef DES 831 des = get_keyword(); 832 #else 833 sprintf(errmsg, "crypt unavailable"); 834 return ERR; 835 #endif 836 break; 837 case 'z': 838 #ifdef BACKWARDS 839 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 840 #else 841 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 842 #endif 843 return ERR; 844 else if ('0' < *ibufp && *ibufp <= '9') 845 STRTOL(rows, ibufp); 846 GET_COMMAND_SUFFIX(); 847 if (display_lines(second_addr, min(addr_last, 848 second_addr + rows), gflag) < 0) 849 return ERR; 850 gflag = 0; 851 break; 852 case '=': 853 GET_COMMAND_SUFFIX(); 854 printf("%ld\n", addr_cnt ? second_addr : addr_last); 855 break; 856 case '!': 857 if (addr_cnt > 0) { 858 sprintf(errmsg, "unexpected address"); 859 return ERR; 860 } else if ((sflags = get_shell_command()) < 0) 861 return ERR; 862 GET_COMMAND_SUFFIX(); 863 if (sflags) printf("%s\n", shcmd + 1); 864 system(shcmd + 1); 865 if (!scripted) printf("!\n"); 866 break; 867 case '\n': 868 #ifdef BACKWARDS 869 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 870 #else 871 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 872 #endif 873 || display_lines(second_addr, second_addr, 0) < 0) 874 return ERR; 875 break; 876 default: 877 sprintf(errmsg, "unknown command"); 878 return ERR; 879 } 880 return gflag; 881 } 882 883 884 /* check_addr_range: return status of address range check */ 885 int 886 check_addr_range(n, m) 887 long n, m; 888 { 889 if (addr_cnt == 0) { 890 first_addr = n; 891 second_addr = m; 892 } 893 if (first_addr > second_addr || 1 > first_addr || 894 second_addr > addr_last) { 895 sprintf(errmsg, "invalid address"); 896 return ERR; 897 } 898 return 0; 899 } 900 901 902 /* get_matching_node_addr: return the address of the next line matching a 903 pattern in a given direction. wrap around begin/end of editor buffer if 904 necessary */ 905 long 906 get_matching_node_addr(pat, dir) 907 pattern_t *pat; 908 int dir; 909 { 910 char *s; 911 long n = current_addr; 912 line_t *lp; 913 914 if (!pat) return ERR; 915 do { 916 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 917 lp = get_addressed_line_node(n); 918 if ((s = get_sbuf_line(lp)) == NULL) 919 return ERR; 920 if (isbinary) 921 NUL_TO_NEWLINE(s, lp->len); 922 if (!regexec(pat, s, 0, NULL, 0)) 923 return n; 924 } 925 } while (n != current_addr); 926 sprintf(errmsg, "no match"); 927 return ERR; 928 } 929 930 931 /* get_filename: return pointer to copy of filename in the command buffer */ 932 char * 933 get_filename() 934 { 935 static char *file = NULL; 936 static int filesz = 0; 937 938 int n; 939 940 if (*ibufp != '\n') { 941 SKIP_BLANKS(); 942 if (*ibufp == '\n') { 943 sprintf(errmsg, "invalid filename"); 944 return NULL; 945 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 946 return NULL; 947 else if (*ibufp == '!') { 948 ibufp++; 949 if ((n = get_shell_command()) < 0) 950 return NULL; 951 if (n) printf("%s\n", shcmd + 1); 952 return shcmd; 953 } else if (n - 1 > MAXPATHLEN) { 954 sprintf(errmsg, "filename too long"); 955 return NULL; 956 } 957 } 958 #ifndef BACKWARDS 959 else if (*old_filename == '\0') { 960 sprintf(errmsg, "no current filename"); 961 return NULL; 962 } 963 #endif 964 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 965 for (n = 0; *ibufp != '\n';) 966 file[n++] = *ibufp++; 967 file[n] = '\0'; 968 return is_legal_filename(file) ? file : NULL; 969 } 970 971 972 /* get_shell_command: read a shell command from stdin; return substitution 973 status */ 974 int 975 get_shell_command() 976 { 977 static char *buf = NULL; 978 static int n = 0; 979 980 char *s; /* substitution char pointer */ 981 int i = 0; 982 int j = 0; 983 984 if (red) { 985 sprintf(errmsg, "shell access restricted"); 986 return ERR; 987 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 988 return ERR; 989 REALLOC(buf, n, j + 1, ERR); 990 buf[i++] = '!'; /* prefix command w/ bang */ 991 while (*ibufp != '\n') 992 switch (*ibufp) { 993 default: 994 REALLOC(buf, n, i + 2, ERR); 995 buf[i++] = *ibufp; 996 if (*ibufp++ == '\\') 997 buf[i++] = *ibufp++; 998 break; 999 case '!': 1000 if (s != ibufp) { 1001 REALLOC(buf, n, i + 1, ERR); 1002 buf[i++] = *ibufp++; 1003 } 1004 #ifdef BACKWARDS 1005 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1006 #else 1007 else if (shcmd == NULL) 1008 #endif 1009 { 1010 sprintf(errmsg, "no previous command"); 1011 return ERR; 1012 } else { 1013 REALLOC(buf, n, i + shcmdi, ERR); 1014 for (s = shcmd + 1; s < shcmd + shcmdi;) 1015 buf[i++] = *s++; 1016 s = ibufp++; 1017 } 1018 break; 1019 case '%': 1020 if (*old_filename == '\0') { 1021 sprintf(errmsg, "no current filename"); 1022 return ERR; 1023 } 1024 j = strlen(s = strip_escapes(old_filename)); 1025 REALLOC(buf, n, i + j, ERR); 1026 while (j--) 1027 buf[i++] = *s++; 1028 s = ibufp++; 1029 break; 1030 } 1031 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1032 memcpy(shcmd, buf, i); 1033 shcmd[shcmdi = i] = '\0'; 1034 return *s == '!' || *s == '%'; 1035 } 1036 1037 1038 /* append_lines: insert text from stdin to after line n; stop when either a 1039 single period is read or EOF; return status */ 1040 int 1041 append_lines(n) 1042 long n; 1043 { 1044 int l; 1045 char *lp = ibuf; 1046 char *eot; 1047 undo_t *up = NULL; 1048 1049 for (current_addr = n;;) { 1050 if (!isglobal) { 1051 if ((l = get_tty_line()) < 0) 1052 return ERR; 1053 else if (l == 0 || ibuf[l - 1] != '\n') { 1054 clearerr(stdin); 1055 return l ? EOF : 0; 1056 } 1057 lp = ibuf; 1058 } else if (*(lp = ibufp) == '\0') 1059 return 0; 1060 else { 1061 while (*ibufp++ != '\n') 1062 ; 1063 l = ibufp - lp; 1064 } 1065 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1066 return 0; 1067 } 1068 eot = lp + l; 1069 SPL1(); 1070 do { 1071 if ((lp = put_sbuf_line(lp)) == NULL) { 1072 SPL0(); 1073 return ERR; 1074 } else if (up) 1075 up->t = get_addressed_line_node(current_addr); 1076 else if ((up = push_undo_stack(UADD, current_addr, 1077 current_addr)) == NULL) { 1078 SPL0(); 1079 return ERR; 1080 } 1081 } while (lp != eot); 1082 modified = 1; 1083 SPL0(); 1084 } 1085 /* NOTREACHED */ 1086 } 1087 1088 1089 /* join_lines: replace a range of lines with the joined text of those lines */ 1090 int 1091 join_lines(from, to) 1092 long from; 1093 long to; 1094 { 1095 static char *buf = NULL; 1096 static int n; 1097 1098 char *s; 1099 int size = 0; 1100 line_t *bp, *ep; 1101 1102 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1103 bp = get_addressed_line_node(from); 1104 for (; bp != ep; bp = bp->q_forw) { 1105 if ((s = get_sbuf_line(bp)) == NULL) 1106 return ERR; 1107 REALLOC(buf, n, size + bp->len, ERR); 1108 memcpy(buf + size, s, bp->len); 1109 size += bp->len; 1110 } 1111 REALLOC(buf, n, size + 2, ERR); 1112 memcpy(buf + size, "\n", 2); 1113 if (delete_lines(from, to) < 0) 1114 return ERR; 1115 current_addr = from - 1; 1116 SPL1(); 1117 if (put_sbuf_line(buf) == NULL || 1118 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1119 SPL0(); 1120 return ERR; 1121 } 1122 modified = 1; 1123 SPL0(); 1124 return 0; 1125 } 1126 1127 1128 /* move_lines: move a range of lines */ 1129 int 1130 move_lines(addr) 1131 long addr; 1132 { 1133 line_t *b1, *a1, *b2, *a2; 1134 long n = INC_MOD(second_addr, addr_last); 1135 long p = first_addr - 1; 1136 int done = (addr == first_addr - 1 || addr == second_addr); 1137 1138 SPL1(); 1139 if (done) { 1140 a2 = get_addressed_line_node(n); 1141 b2 = get_addressed_line_node(p); 1142 current_addr = second_addr; 1143 } else if (push_undo_stack(UMOV, p, n) == NULL || 1144 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1145 SPL0(); 1146 return ERR; 1147 } else { 1148 a1 = get_addressed_line_node(n); 1149 if (addr < first_addr) { 1150 b1 = get_addressed_line_node(p); 1151 b2 = get_addressed_line_node(addr); 1152 /* this get_addressed_line_node last! */ 1153 } else { 1154 b2 = get_addressed_line_node(addr); 1155 b1 = get_addressed_line_node(p); 1156 /* this get_addressed_line_node last! */ 1157 } 1158 a2 = b2->q_forw; 1159 REQUE(b2, b1->q_forw); 1160 REQUE(a1->q_back, a2); 1161 REQUE(b1, a1); 1162 current_addr = addr + ((addr < first_addr) ? 1163 second_addr - first_addr + 1 : 0); 1164 } 1165 if (isglobal) 1166 unset_active_nodes(b2->q_forw, a2); 1167 modified = 1; 1168 SPL0(); 1169 return 0; 1170 } 1171 1172 1173 /* copy_lines: copy a range of lines; return status */ 1174 int 1175 copy_lines(addr) 1176 long addr; 1177 { 1178 line_t *lp, *np = get_addressed_line_node(first_addr); 1179 undo_t *up = NULL; 1180 long n = second_addr - first_addr + 1; 1181 long m = 0; 1182 1183 current_addr = addr; 1184 if (first_addr <= addr && addr < second_addr) { 1185 n = addr - first_addr + 1; 1186 m = second_addr - addr; 1187 } 1188 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1189 for (; n-- > 0; np = np->q_forw) { 1190 SPL1(); 1191 if ((lp = dup_line_node(np)) == NULL) { 1192 SPL0(); 1193 return ERR; 1194 } 1195 add_line_node(lp); 1196 if (up) 1197 up->t = lp; 1198 else if ((up = push_undo_stack(UADD, current_addr, 1199 current_addr)) == NULL) { 1200 SPL0(); 1201 return ERR; 1202 } 1203 modified = 1; 1204 SPL0(); 1205 } 1206 return 0; 1207 } 1208 1209 1210 /* delete_lines: delete a range of lines */ 1211 int 1212 delete_lines(from, to) 1213 long from, to; 1214 { 1215 line_t *n, *p; 1216 1217 SPL1(); 1218 if (push_undo_stack(UDEL, from, to) == NULL) { 1219 SPL0(); 1220 return ERR; 1221 } 1222 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1223 p = get_addressed_line_node(from - 1); 1224 /* this get_addressed_line_node last! */ 1225 if (isglobal) 1226 unset_active_nodes(p->q_forw, n); 1227 REQUE(p, n); 1228 addr_last -= to - from + 1; 1229 current_addr = from - 1; 1230 modified = 1; 1231 SPL0(); 1232 return 0; 1233 } 1234 1235 1236 /* display_lines: print a range of lines to stdout */ 1237 int 1238 display_lines(from, to, gflag) 1239 long from; 1240 long to; 1241 int gflag; 1242 { 1243 line_t *bp; 1244 line_t *ep; 1245 char *s; 1246 1247 if (!from) { 1248 sprintf(errmsg, "invalid address"); 1249 return ERR; 1250 } 1251 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1252 bp = get_addressed_line_node(from); 1253 for (; bp != ep; bp = bp->q_forw) { 1254 if ((s = get_sbuf_line(bp)) == NULL) 1255 return ERR; 1256 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1257 return ERR; 1258 } 1259 return 0; 1260 } 1261 1262 1263 #define MAXMARK 26 /* max number of marks */ 1264 1265 line_t *mark[MAXMARK]; /* line markers */ 1266 int markno; /* line marker count */ 1267 1268 /* mark_line_node: set a line node mark */ 1269 int 1270 mark_line_node(lp, n) 1271 line_t *lp; 1272 int n; 1273 { 1274 if (!islower((unsigned char)n)) { 1275 sprintf(errmsg, "invalid mark character"); 1276 return ERR; 1277 } else if (mark[n - 'a'] == NULL) 1278 markno++; 1279 mark[n - 'a'] = lp; 1280 return 0; 1281 } 1282 1283 1284 /* get_marked_node_addr: return address of a marked line */ 1285 long 1286 get_marked_node_addr(n) 1287 int n; 1288 { 1289 if (!islower((unsigned char)n)) { 1290 sprintf(errmsg, "invalid mark character"); 1291 return ERR; 1292 } 1293 return get_line_node_addr(mark[n - 'a']); 1294 } 1295 1296 1297 /* unmark_line_node: clear line node mark */ 1298 void 1299 unmark_line_node(lp) 1300 line_t *lp; 1301 { 1302 int i; 1303 1304 for (i = 0; markno && i < MAXMARK; i++) 1305 if (mark[i] == lp) { 1306 mark[i] = NULL; 1307 markno--; 1308 } 1309 } 1310 1311 1312 /* dup_line_node: return a pointer to a copy of a line node */ 1313 line_t * 1314 dup_line_node(lp) 1315 line_t *lp; 1316 { 1317 line_t *np; 1318 1319 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1320 fprintf(stderr, "%s\n", strerror(errno)); 1321 sprintf(errmsg, "out of memory"); 1322 return NULL; 1323 } 1324 np->seek = lp->seek; 1325 np->len = lp->len; 1326 return np; 1327 } 1328 1329 1330 /* has_trailing_escape: return the parity of escapes preceding a character 1331 in a string */ 1332 int 1333 has_trailing_escape(s, t) 1334 char *s; 1335 char *t; 1336 { 1337 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1338 } 1339 1340 1341 /* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1342 char * 1343 strip_escapes(s) 1344 char *s; 1345 { 1346 static char *file = NULL; 1347 static int filesz = 0; 1348 1349 int i = 0; 1350 1351 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 1352 while (i < filesz - 1 /* Worry about a possible trailing escape */ 1353 && (file[i++] = (*s == '\\') ? *++s : *s)) 1354 s++; 1355 return file; 1356 } 1357 1358 1359 void 1360 signal_hup(signo) 1361 int signo; 1362 { 1363 if (mutex) 1364 sigflags |= (1 << (signo - 1)); 1365 else 1366 handle_hup(signo); 1367 } 1368 1369 1370 void 1371 signal_int(signo) 1372 int signo; 1373 { 1374 if (mutex) 1375 sigflags |= (1 << (signo - 1)); 1376 else 1377 handle_int(signo); 1378 } 1379 1380 1381 void 1382 handle_hup(signo) 1383 int signo; 1384 { 1385 char *hup = NULL; /* hup filename */ 1386 char *s; 1387 int n; 1388 1389 if (!sigactive) 1390 quit(1); 1391 sigflags &= ~(1 << (signo - 1)); 1392 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1393 (s = getenv("HOME")) != NULL && 1394 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */ 1395 (hup = (char *) malloc(n + 10)) != NULL) { 1396 strcpy(hup, s); 1397 if (hup[n - 1] != '/') 1398 hup[n] = '/', hup[n+1] = '\0'; 1399 strcat(hup, "ed.hup"); 1400 write_file(hup, "w", 1, addr_last); 1401 } 1402 quit(2); 1403 } 1404 1405 1406 void 1407 handle_int(signo) 1408 int signo; 1409 { 1410 if (!sigactive) 1411 quit(1); 1412 sigflags &= ~(1 << (signo - 1)); 1413 #ifdef _POSIX_SOURCE 1414 siglongjmp(env, -1); 1415 #else 1416 longjmp(env, -1); 1417 #endif 1418 } 1419 1420 1421 int cols = 72; /* wrap column */ 1422 1423 void 1424 handle_winch(signo) 1425 int signo; 1426 { 1427 int save_errno = errno; 1428 1429 struct winsize ws; /* window size structure */ 1430 1431 sigflags &= ~(1 << (signo - 1)); 1432 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1433 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1434 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1435 } 1436 errno = save_errno; 1437 } 1438 1439 1440 /* is_legal_filename: return a legal filename */ 1441 int 1442 is_legal_filename(s) 1443 char *s; 1444 { 1445 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1446 sprintf(errmsg, "shell access restricted"); 1447 return 0; 1448 } 1449 return 1; 1450 } 1451