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 const char copyright[] = 31 "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\ 32 All rights reserved.\n"; 33 #endif /* not lint */ 34 35 #ifndef lint 36 static const char rcsid[] = 37 "$FreeBSD$"; 38 #endif /* not lint */ 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 sigjmp_buf env; 70 #else 71 jmp_buf env; 72 #endif 73 74 /* static buffers */ 75 char stdinbuf[1]; /* stdin buffer */ 76 char *shcmd; /* shell command buffer */ 77 int shcmdsz; /* shell command buffer size */ 78 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 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 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 int sigactive = 0; /* if set, signal handlers are enabled */ 94 95 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 const char *prompt; /* command-line prompt */ 100 const char *dps = "*"; /* default command-line prompt */ 101 102 const char usage[] = "usage: %s [-] [-sx] [-p string] [name]\n"; 103 104 /* ed: line editor */ 105 int 106 main(argc, argv) 107 int argc; 108 char **argv; 109 { 110 int c, n; 111 long status = 0; 112 #if __GNUC__ 113 /* Avoid longjmp clobbering */ 114 (void) &argc; 115 (void) &argv; 116 #endif 117 118 (void)setlocale(LC_ALL, ""); 119 120 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 121 top: 122 while ((c = getopt(argc, argv, "p:sx")) != -1) 123 switch(c) { 124 case 'p': /* set prompt */ 125 prompt = optarg; 126 break; 127 case 's': /* run script */ 128 scripted = 1; 129 break; 130 case 'x': /* use crypt */ 131 #ifdef DES 132 des = get_keyword(); 133 #else 134 fprintf(stderr, "crypt unavailable\n?\n"); 135 #endif 136 break; 137 138 default: 139 fprintf(stderr, usage, argv[0]); 140 exit(1); 141 } 142 argv += optind; 143 argc -= optind; 144 if (argc && **argv == '-') { 145 scripted = 1; 146 if (argc > 1) { 147 optind = 1; 148 goto top; 149 } 150 argv++; 151 argc--; 152 } 153 /* assert: reliable signals! */ 154 #ifdef SIGWINCH 155 handle_winch(SIGWINCH); 156 if (isatty(0)) signal(SIGWINCH, handle_winch); 157 #endif 158 signal(SIGHUP, signal_hup); 159 signal(SIGQUIT, SIG_IGN); 160 signal(SIGINT, signal_int); 161 #ifdef _POSIX_SOURCE 162 if ((status = sigsetjmp(env, 1))) 163 #else 164 if ((status = setjmp(env))) 165 #endif 166 { 167 fputs("\n?\n", stderr); 168 errmsg = "interrupt"; 169 } else { 170 init_buffers(); 171 sigactive = 1; /* enable signal handlers */ 172 if (argc && **argv && is_legal_filename(*argv)) { 173 if (read_file(*argv, 0) < 0 && !isatty(0)) 174 quit(2); 175 else if (**argv != '!') 176 if (strlcpy(old_filename, *argv, sizeof(old_filename)) 177 >= sizeof(old_filename)) 178 quit(2); 179 } else if (argc) { 180 fputs("?\n", stderr); 181 if (**argv == '\0') 182 errmsg = "invalid filename"; 183 if (!isatty(0)) 184 quit(2); 185 } 186 } 187 for (;;) { 188 if (status < 0 && garrulous) 189 fprintf(stderr, "%s\n", errmsg); 190 if (prompt) { 191 printf("%s", prompt); 192 fflush(stdout); 193 } 194 if ((n = get_tty_line()) < 0) { 195 status = ERR; 196 continue; 197 } else if (n == 0) { 198 if (modified && !scripted) { 199 fputs("?\n", stderr); 200 errmsg = "warning: file modified"; 201 if (!isatty(0)) { 202 fprintf(stderr, garrulous ? 203 "script, line %d: %s\n" : 204 "", lineno, errmsg); 205 quit(2); 206 } 207 clearerr(stdin); 208 modified = 0; 209 status = EMOD; 210 continue; 211 } else 212 quit(0); 213 } else if (ibuf[n - 1] != '\n') { 214 /* discard line */ 215 errmsg = "unexpected end-of-file"; 216 clearerr(stdin); 217 status = ERR; 218 continue; 219 } 220 isglobal = 0; 221 if ((status = extract_addr_range()) >= 0 && 222 (status = exec_command()) >= 0) 223 if (!status || 224 (status = display_lines(current_addr, current_addr, 225 status)) >= 0) 226 continue; 227 switch (status) { 228 case EOF: 229 quit(0); 230 case EMOD: 231 modified = 0; 232 fputs("?\n", stderr); /* give warning */ 233 errmsg = "warning: file modified"; 234 if (!isatty(0)) { 235 fprintf(stderr, garrulous ? 236 "script, line %d: %s\n" : 237 "", lineno, errmsg); 238 quit(2); 239 } 240 break; 241 case FATAL: 242 if (!isatty(0)) 243 fprintf(stderr, garrulous ? 244 "script, line %d: %s\n" : "", 245 lineno, errmsg); 246 else 247 fprintf(stderr, garrulous ? "%s\n" : "", 248 errmsg); 249 quit(3); 250 default: 251 fputs("?\n", stderr); 252 if (!isatty(0)) { 253 fprintf(stderr, garrulous ? 254 "script, line %d: %s\n" : "", 255 lineno, errmsg); 256 quit(2); 257 } 258 break; 259 } 260 } 261 /*NOTREACHED*/ 262 } 263 264 long first_addr, second_addr, addr_cnt; 265 266 /* extract_addr_range: get line addresses from the command buffer until an 267 illegal address is seen; return status */ 268 int 269 extract_addr_range() 270 { 271 long addr; 272 273 addr_cnt = 0; 274 first_addr = second_addr = current_addr; 275 while ((addr = next_addr()) >= 0) { 276 addr_cnt++; 277 first_addr = second_addr; 278 second_addr = addr; 279 if (*ibufp != ',' && *ibufp != ';') 280 break; 281 else if (*ibufp++ == ';') 282 current_addr = addr; 283 } 284 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 285 first_addr = second_addr; 286 return (addr == ERR) ? ERR : 0; 287 } 288 289 290 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++ 291 292 #define MUST_BE_FIRST() do { \ 293 if (!first) { \ 294 errmsg = "invalid address"; \ 295 return ERR; \ 296 } \ 297 } while (0); 298 299 /* next_addr: return the next line address in the command buffer */ 300 long 301 next_addr() 302 { 303 const 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 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 errmsg = "destination expected"; \ 387 return ERR; \ 388 } else if (second_addr < 0 || addr_last < second_addr) { \ 389 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 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 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 errmsg = "unexpected address"; 503 return ERR; 504 } else if (!isspace((unsigned char)*ibufp)) { 505 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 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 errmsg = "unexpected address"; 533 return ERR; 534 } else if (!isspace((unsigned char)*ibufp)) { 535 errmsg = "unexpected command suffix"; 536 return ERR; 537 } else if ((fnp = get_filename()) == NULL) 538 return ERR; 539 else if (*fnp == '!') { 540 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 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 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 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 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 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 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 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 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 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 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 errmsg = "invalid command suffix"; 714 return ERR; 715 } 716 } 717 } while (sflags && *ibufp != '\n'); 718 if (sflags && !pat) { 719 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 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 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 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 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 errmsg = "unexpected address"; 827 return ERR; 828 } 829 GET_COMMAND_SUFFIX(); 830 #ifdef DES 831 des = get_keyword(); 832 #else 833 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 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 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 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 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 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) 952 printf("%s\n", shcmd + 1); 953 return shcmd; 954 } else if (n > PATH_MAX - 1) { 955 errmsg = "filename too long"; 956 return NULL; 957 } 958 } 959 #ifndef BACKWARDS 960 else if (*old_filename == '\0') { 961 errmsg = "no current filename"; 962 return NULL; 963 } 964 #endif 965 REALLOC(file, filesz, PATH_MAX, NULL); 966 for (n = 0; *ibufp != '\n';) 967 file[n++] = *ibufp++; 968 file[n] = '\0'; 969 return is_legal_filename(file) ? file : NULL; 970 } 971 972 973 /* get_shell_command: read a shell command from stdin; return substitution 974 status */ 975 int 976 get_shell_command() 977 { 978 static char *buf = NULL; 979 static int n = 0; 980 981 char *s; /* substitution char pointer */ 982 int i = 0; 983 int j = 0; 984 985 if (red) { 986 errmsg = "shell access restricted"; 987 return ERR; 988 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 989 return ERR; 990 REALLOC(buf, n, j + 1, ERR); 991 buf[i++] = '!'; /* prefix command w/ bang */ 992 while (*ibufp != '\n') 993 switch (*ibufp) { 994 default: 995 REALLOC(buf, n, i + 2, ERR); 996 buf[i++] = *ibufp; 997 if (*ibufp++ == '\\') 998 buf[i++] = *ibufp++; 999 break; 1000 case '!': 1001 if (s != ibufp) { 1002 REALLOC(buf, n, i + 1, ERR); 1003 buf[i++] = *ibufp++; 1004 } 1005 #ifdef BACKWARDS 1006 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1007 #else 1008 else if (shcmd == NULL) 1009 #endif 1010 { 1011 errmsg = "no previous command"; 1012 return ERR; 1013 } else { 1014 REALLOC(buf, n, i + shcmdi, ERR); 1015 for (s = shcmd + 1; s < shcmd + shcmdi;) 1016 buf[i++] = *s++; 1017 s = ibufp++; 1018 } 1019 break; 1020 case '%': 1021 if (*old_filename == '\0') { 1022 errmsg = "no current filename"; 1023 return ERR; 1024 } 1025 j = strlen(s = strip_escapes(old_filename)); 1026 REALLOC(buf, n, i + j, ERR); 1027 while (j--) 1028 buf[i++] = *s++; 1029 s = ibufp++; 1030 break; 1031 } 1032 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1033 memcpy(shcmd, buf, i); 1034 shcmd[shcmdi = i] = '\0'; 1035 return *s == '!' || *s == '%'; 1036 } 1037 1038 1039 /* append_lines: insert text from stdin to after line n; stop when either a 1040 single period is read or EOF; return status */ 1041 int 1042 append_lines(n) 1043 long n; 1044 { 1045 int l; 1046 const char *lp = ibuf; 1047 const char *eot; 1048 undo_t *up = NULL; 1049 1050 for (current_addr = n;;) { 1051 if (!isglobal) { 1052 if ((l = get_tty_line()) < 0) 1053 return ERR; 1054 else if (l == 0 || ibuf[l - 1] != '\n') { 1055 clearerr(stdin); 1056 return l ? EOF : 0; 1057 } 1058 lp = ibuf; 1059 } else if (*(lp = ibufp) == '\0') 1060 return 0; 1061 else { 1062 while (*ibufp++ != '\n') 1063 ; 1064 l = ibufp - lp; 1065 } 1066 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1067 return 0; 1068 } 1069 eot = lp + l; 1070 SPL1(); 1071 do { 1072 if ((lp = put_sbuf_line(lp)) == NULL) { 1073 SPL0(); 1074 return ERR; 1075 } else if (up) 1076 up->t = get_addressed_line_node(current_addr); 1077 else if ((up = push_undo_stack(UADD, current_addr, 1078 current_addr)) == NULL) { 1079 SPL0(); 1080 return ERR; 1081 } 1082 } while (lp != eot); 1083 modified = 1; 1084 SPL0(); 1085 } 1086 /* NOTREACHED */ 1087 } 1088 1089 1090 /* join_lines: replace a range of lines with the joined text of those lines */ 1091 int 1092 join_lines(from, to) 1093 long from; 1094 long to; 1095 { 1096 static char *buf = NULL; 1097 static int n; 1098 1099 char *s; 1100 int size = 0; 1101 line_t *bp, *ep; 1102 1103 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1104 bp = get_addressed_line_node(from); 1105 for (; bp != ep; bp = bp->q_forw) { 1106 if ((s = get_sbuf_line(bp)) == NULL) 1107 return ERR; 1108 REALLOC(buf, n, size + bp->len, ERR); 1109 memcpy(buf + size, s, bp->len); 1110 size += bp->len; 1111 } 1112 REALLOC(buf, n, size + 2, ERR); 1113 memcpy(buf + size, "\n", 2); 1114 if (delete_lines(from, to) < 0) 1115 return ERR; 1116 current_addr = from - 1; 1117 SPL1(); 1118 if (put_sbuf_line(buf) == NULL || 1119 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1120 SPL0(); 1121 return ERR; 1122 } 1123 modified = 1; 1124 SPL0(); 1125 return 0; 1126 } 1127 1128 1129 /* move_lines: move a range of lines */ 1130 int 1131 move_lines(addr) 1132 long addr; 1133 { 1134 line_t *b1, *a1, *b2, *a2; 1135 long n = INC_MOD(second_addr, addr_last); 1136 long p = first_addr - 1; 1137 int done = (addr == first_addr - 1 || addr == second_addr); 1138 1139 SPL1(); 1140 if (done) { 1141 a2 = get_addressed_line_node(n); 1142 b2 = get_addressed_line_node(p); 1143 current_addr = second_addr; 1144 } else if (push_undo_stack(UMOV, p, n) == NULL || 1145 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1146 SPL0(); 1147 return ERR; 1148 } else { 1149 a1 = get_addressed_line_node(n); 1150 if (addr < first_addr) { 1151 b1 = get_addressed_line_node(p); 1152 b2 = get_addressed_line_node(addr); 1153 /* this get_addressed_line_node last! */ 1154 } else { 1155 b2 = get_addressed_line_node(addr); 1156 b1 = get_addressed_line_node(p); 1157 /* this get_addressed_line_node last! */ 1158 } 1159 a2 = b2->q_forw; 1160 REQUE(b2, b1->q_forw); 1161 REQUE(a1->q_back, a2); 1162 REQUE(b1, a1); 1163 current_addr = addr + ((addr < first_addr) ? 1164 second_addr - first_addr + 1 : 0); 1165 } 1166 if (isglobal) 1167 unset_active_nodes(b2->q_forw, a2); 1168 modified = 1; 1169 SPL0(); 1170 return 0; 1171 } 1172 1173 1174 /* copy_lines: copy a range of lines; return status */ 1175 int 1176 copy_lines(addr) 1177 long addr; 1178 { 1179 line_t *lp, *np = get_addressed_line_node(first_addr); 1180 undo_t *up = NULL; 1181 long n = second_addr - first_addr + 1; 1182 long m = 0; 1183 1184 current_addr = addr; 1185 if (first_addr <= addr && addr < second_addr) { 1186 n = addr - first_addr + 1; 1187 m = second_addr - addr; 1188 } 1189 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1190 for (; n-- > 0; np = np->q_forw) { 1191 SPL1(); 1192 if ((lp = dup_line_node(np)) == NULL) { 1193 SPL0(); 1194 return ERR; 1195 } 1196 add_line_node(lp); 1197 if (up) 1198 up->t = lp; 1199 else if ((up = push_undo_stack(UADD, current_addr, 1200 current_addr)) == NULL) { 1201 SPL0(); 1202 return ERR; 1203 } 1204 modified = 1; 1205 SPL0(); 1206 } 1207 return 0; 1208 } 1209 1210 1211 /* delete_lines: delete a range of lines */ 1212 int 1213 delete_lines(from, to) 1214 long from, to; 1215 { 1216 line_t *n, *p; 1217 1218 SPL1(); 1219 if (push_undo_stack(UDEL, from, to) == NULL) { 1220 SPL0(); 1221 return ERR; 1222 } 1223 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1224 p = get_addressed_line_node(from - 1); 1225 /* this get_addressed_line_node last! */ 1226 if (isglobal) 1227 unset_active_nodes(p->q_forw, n); 1228 REQUE(p, n); 1229 addr_last -= to - from + 1; 1230 current_addr = from - 1; 1231 modified = 1; 1232 SPL0(); 1233 return 0; 1234 } 1235 1236 1237 /* display_lines: print a range of lines to stdout */ 1238 int 1239 display_lines(from, to, gflag) 1240 long from; 1241 long to; 1242 int gflag; 1243 { 1244 line_t *bp; 1245 line_t *ep; 1246 char *s; 1247 1248 if (!from) { 1249 errmsg = "invalid address"; 1250 return ERR; 1251 } 1252 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1253 bp = get_addressed_line_node(from); 1254 for (; bp != ep; bp = bp->q_forw) { 1255 if ((s = get_sbuf_line(bp)) == NULL) 1256 return ERR; 1257 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1258 return ERR; 1259 } 1260 return 0; 1261 } 1262 1263 1264 #define MAXMARK 26 /* max number of marks */ 1265 1266 line_t *mark[MAXMARK]; /* line markers */ 1267 int markno; /* line marker count */ 1268 1269 /* mark_line_node: set a line node mark */ 1270 int 1271 mark_line_node(lp, n) 1272 line_t *lp; 1273 int n; 1274 { 1275 if (!islower((unsigned char)n)) { 1276 errmsg = "invalid mark character"; 1277 return ERR; 1278 } else if (mark[n - 'a'] == NULL) 1279 markno++; 1280 mark[n - 'a'] = lp; 1281 return 0; 1282 } 1283 1284 1285 /* get_marked_node_addr: return address of a marked line */ 1286 long 1287 get_marked_node_addr(n) 1288 int n; 1289 { 1290 if (!islower((unsigned char)n)) { 1291 errmsg = "invalid mark character"; 1292 return ERR; 1293 } 1294 return get_line_node_addr(mark[n - 'a']); 1295 } 1296 1297 1298 /* unmark_line_node: clear line node mark */ 1299 void 1300 unmark_line_node(lp) 1301 line_t *lp; 1302 { 1303 int i; 1304 1305 for (i = 0; markno && i < MAXMARK; i++) 1306 if (mark[i] == lp) { 1307 mark[i] = NULL; 1308 markno--; 1309 } 1310 } 1311 1312 1313 /* dup_line_node: return a pointer to a copy of a line node */ 1314 line_t * 1315 dup_line_node(lp) 1316 line_t *lp; 1317 { 1318 line_t *np; 1319 1320 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1321 fprintf(stderr, "%s\n", strerror(errno)); 1322 errmsg = "out of memory"; 1323 return NULL; 1324 } 1325 np->seek = lp->seek; 1326 np->len = lp->len; 1327 return np; 1328 } 1329 1330 1331 /* has_trailing_escape: return the parity of escapes preceding a character 1332 in a string */ 1333 int 1334 has_trailing_escape(s, t) 1335 char *s; 1336 char *t; 1337 { 1338 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1339 } 1340 1341 1342 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */ 1343 char * 1344 strip_escapes(s) 1345 char *s; 1346 { 1347 static char *file = NULL; 1348 static int filesz = 0; 1349 1350 int i = 0; 1351 1352 REALLOC(file, filesz, PATH_MAX, NULL); 1353 while (i < filesz - 1 /* Worry about a possible trailing escape */ 1354 && (file[i++] = (*s == '\\') ? *++s : *s)) 1355 s++; 1356 return file; 1357 } 1358 1359 1360 void 1361 signal_hup(signo) 1362 int signo; 1363 { 1364 if (mutex) 1365 sigflags |= (1 << (signo - 1)); 1366 else 1367 handle_hup(signo); 1368 } 1369 1370 1371 void 1372 signal_int(signo) 1373 int signo; 1374 { 1375 if (mutex) 1376 sigflags |= (1 << (signo - 1)); 1377 else 1378 handle_int(signo); 1379 } 1380 1381 1382 void 1383 handle_hup(signo) 1384 int signo; 1385 { 1386 char *hup = NULL; /* hup filename */ 1387 char *s; 1388 char ed_hup[] = "ed.hup"; 1389 int n; 1390 1391 if (!sigactive) 1392 quit(1); 1393 sigflags &= ~(1 << (signo - 1)); 1394 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 && 1395 (s = getenv("HOME")) != NULL && 1396 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */ 1397 (hup = (char *) malloc(n + 10)) != NULL) { 1398 strcpy(hup, s); 1399 if (hup[n - 1] != '/') 1400 hup[n] = '/', hup[n+1] = '\0'; 1401 strcat(hup, "ed.hup"); 1402 write_file(hup, "w", 1, addr_last); 1403 } 1404 quit(2); 1405 } 1406 1407 1408 void 1409 handle_int(signo) 1410 int signo; 1411 { 1412 if (!sigactive) 1413 quit(1); 1414 sigflags &= ~(1 << (signo - 1)); 1415 #ifdef _POSIX_SOURCE 1416 siglongjmp(env, -1); 1417 #else 1418 longjmp(env, -1); 1419 #endif 1420 } 1421 1422 1423 int cols = 72; /* wrap column */ 1424 1425 void 1426 handle_winch(signo) 1427 int signo; 1428 { 1429 int save_errno = errno; 1430 1431 struct winsize ws; /* window size structure */ 1432 1433 sigflags &= ~(1 << (signo - 1)); 1434 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1435 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1436 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1437 } 1438 errno = save_errno; 1439 } 1440 1441 1442 /* is_legal_filename: return a legal filename */ 1443 int 1444 is_legal_filename(s) 1445 char *s; 1446 { 1447 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1448 errmsg = "shell access restricted"; 1449 return 0; 1450 } 1451 return 1; 1452 } 1453