1 /* $NetBSD: main.c,v 1.31 2025/09/17 20:35:11 rillig Exp $ */ 2 3 /* main.c: This file contains the main control and user-interface routines 4 for the ed line editor. */ 5 /*- 6 * Copyright (c) 1993 Andrew Moore, Talke Studio. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #ifndef lint 33 __COPYRIGHT( 34 "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio.\ 35 All rights reserved."); 36 #endif /* not lint */ 37 38 #ifndef lint 39 #if 0 40 static char *rcsid = "@(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp"; 41 #else 42 __RCSID("$NetBSD: main.c,v 1.31 2025/09/17 20:35:11 rillig Exp $"); 43 #endif 44 #endif /* not lint */ 45 46 /* 47 * CREDITS 48 * 49 * This program is based on the editor algorithm described in 50 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 51 * in Pascal," Addison-Wesley, 1981. 52 * 53 * The buffering algorithm is attributed to Rodney Ruddock of 54 * the University of Guelph, Guelph, Ontario. 55 * 56 * The cbc.c encryption code is adapted from 57 * the bdes program by Matt Bishop of Dartmouth College, 58 * Hanover, NH. 59 * 60 */ 61 62 #include <sys/ioctl.h> 63 #include <sys/wait.h> 64 #include <termios.h> 65 #include <ctype.h> 66 #include <setjmp.h> 67 #include <pwd.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 ere = 0; /* if set, use extended regexes */ 96 int scripted = 0; /* if set, suppress diagnostics */ 97 int secure = 0; /* is set, ! is not allowed */ 98 int sigflags = 0; /* if set, signals received while mutex set */ 99 int sigactive = 0; /* if set, signal handlers are enabled */ 100 101 char old_filename[MAXPATHLEN + 1] = ""; /* default filename */ 102 long current_addr; /* current address in editor buffer */ 103 long addr_last; /* last address in editor buffer */ 104 int lineno; /* script line number */ 105 const char *prompt; /* command-line prompt */ 106 const char *dps = "*"; /* default command-line prompt */ 107 108 109 static const char usage[] = "Usage: %s [-] [-ESsx] [-p string] [name]\n"; 110 111 /* ed: line editor */ 112 int 113 main(int ac, char *av[]) 114 { 115 int c, n; 116 long status = 0; 117 volatile int argc = ac; 118 char ** volatile argv = av; 119 120 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 121 top: 122 while ((c = getopt(argc, argv, "p:sxES")) != -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 case 'E': 139 ere = REG_EXTENDED; 140 break; 141 case 'S': /* ! is not allowed */ 142 secure = 1; 143 break; 144 default: 145 fprintf(stderr, usage, getprogname()); 146 exit(1); 147 /* NOTREACHED */ 148 } 149 argv += optind; 150 argc -= optind; 151 if (argc && **argv == '-') { 152 scripted = 1; 153 if (argc > 1) { 154 optind = 1; 155 goto top; 156 } 157 argv++; 158 argc--; 159 } 160 /* assert: reliable signals! */ 161 #ifdef SIGWINCH 162 handle_winch(SIGWINCH); 163 if (isatty(0)) signal(SIGWINCH, handle_winch); 164 #endif 165 signal(SIGHUP, signal_hup); 166 signal(SIGQUIT, SIG_IGN); 167 signal(SIGINT, signal_int); 168 #ifdef _POSIX_SOURCE 169 if ((status = sigsetjmp(env, 1)) != 0) 170 #else 171 if ((status = setjmp(env)) != 0) 172 #endif 173 { 174 fputs("\n?\n", stderr); 175 seterrmsg("interrupt"); 176 } else { 177 init_buffers(); 178 sigactive = 1; /* enable signal handlers */ 179 if (argc && **argv && is_legal_filename(*argv)) { 180 if (read_file(*argv, 0) < 0 && !isatty(0)) 181 quit(2); 182 else if (**argv != '!') 183 strlcpy(old_filename, *argv, 184 sizeof(old_filename) - 2); 185 } else if (argc) { 186 fputs("?\n", stderr); 187 if (**argv == '\0') 188 seterrmsg("invalid filename"); 189 if (!isatty(0)) 190 quit(2); 191 } 192 } 193 for (;;) { 194 if (status < 0 && garrulous) 195 fprintf(stderr, "%s\n", errmsg); 196 if (prompt) { 197 printf("%s", prompt); 198 fflush(stdout); 199 } 200 if ((n = get_tty_line()) < 0) { 201 status = ERR; 202 continue; 203 } else if (n == 0) { 204 if (modified && !scripted) { 205 fputs("?\n", stderr); 206 seterrmsg("warning: file modified"); 207 if (!isatty(0)) { 208 if (garrulous) { 209 fprintf(stderr, 210 "script, line %d: %s\n", 211 lineno, errmsg); 212 } 213 quit(2); 214 } 215 clearerr(stdin); 216 modified = 0; 217 status = EMOD; 218 continue; 219 } else 220 quit(0); 221 } else if (ibuf[n - 1] != '\n') { 222 /* discard line */ 223 seterrmsg("unexpected end-of-file"); 224 clearerr(stdin); 225 status = ERR; 226 continue; 227 } 228 isglobal = 0; 229 if ((status = extract_addr_range()) >= 0 && 230 (status = exec_command()) >= 0) { 231 if (status == 0) 232 continue; 233 status = display_lines(current_addr, current_addr, 234 status); 235 if (status >= 0) 236 continue; 237 } 238 switch (status) { 239 case EOF: 240 quit(0); 241 case EMOD: 242 modified = 0; 243 fputs("?\n", stderr); /* give warning */ 244 seterrmsg("warning: file modified"); 245 if (!isatty(0)) { 246 if (garrulous) { 247 fprintf(stderr, 248 "script, line %d: %s\n", 249 lineno, errmsg); 250 } 251 quit(2); 252 } 253 break; 254 case FATAL: 255 if (garrulous) { 256 if (!isatty(0)) { 257 fprintf(stderr, 258 "script, line %d: %s\n", 259 lineno, errmsg); 260 } else { 261 fprintf(stderr, "%s\n", errmsg); 262 } 263 } 264 quit(3); 265 default: 266 fputs("?\n", stderr); 267 if (!isatty(0)) { 268 if (garrulous) { 269 fprintf(stderr, "script, line %d: %s\n", 270 lineno, errmsg); 271 } 272 quit(2); 273 } 274 break; 275 } 276 } 277 /* NOTREACHED */ 278 } 279 280 long first_addr, second_addr, addr_cnt; 281 282 /* extract_addr_range: get line addresses from the command buffer until an 283 illegal address is seen; return status */ 284 int 285 extract_addr_range(void) 286 { 287 long addr; 288 289 addr_cnt = 0; 290 first_addr = second_addr = current_addr; 291 while ((addr = next_addr()) >= 0) { 292 addr_cnt++; 293 first_addr = second_addr; 294 second_addr = addr; 295 if (*ibufp != ',' && *ibufp != ';') 296 break; 297 else if (*ibufp++ == ';') 298 current_addr = addr; 299 } 300 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 301 first_addr = second_addr; 302 return (addr == ERR) ? ERR : 0; 303 } 304 305 306 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') \ 307 ibufp++ 308 309 #define MUST_BE_FIRST() \ 310 if (!first) { seterrmsg("invalid address"); return ERR; } 311 312 /* next_addr: return the next line address in the command buffer */ 313 long 314 next_addr(void) 315 { 316 char *hd; 317 long addr = current_addr; 318 long n; 319 int first = 1; 320 int c; 321 322 SKIP_BLANKS(); 323 for (hd = ibufp;; first = 0) 324 switch (c = *ibufp) { 325 case '+': 326 case '\t': 327 case ' ': 328 case '-': 329 case '^': 330 ibufp++; 331 SKIP_BLANKS(); 332 if (isdigit((unsigned char)*ibufp)) { 333 STRTOL(n, ibufp); 334 addr += (c == '-' || c == '^') ? -n : n; 335 } else if (!isspace((unsigned char)c)) 336 addr += (c == '-' || c == '^') ? -1 : 1; 337 break; 338 case '0': case '1': case '2': 339 case '3': case '4': case '5': 340 case '6': case '7': case '8': case '9': 341 MUST_BE_FIRST(); 342 STRTOL(addr, ibufp); 343 break; 344 case '.': 345 case '$': 346 MUST_BE_FIRST(); 347 ibufp++; 348 addr = (c == '.') ? current_addr : addr_last; 349 break; 350 case '/': 351 case '?': 352 MUST_BE_FIRST(); 353 if ((addr = get_matching_node_addr( 354 get_compiled_pattern(), c == '/')) < 0) 355 return ERR; 356 else if (c == *ibufp) 357 ibufp++; 358 break; 359 case '\'': 360 MUST_BE_FIRST(); 361 ibufp++; 362 if ((addr = get_marked_node_addr((unsigned char)*ibufp++)) < 0) 363 return ERR; 364 break; 365 case '%': 366 case ',': 367 case ';': 368 if (first) { 369 ibufp++; 370 addr_cnt++; 371 second_addr = (c == ';') ? current_addr : 1; 372 addr = addr_last; 373 break; 374 } 375 /* FALL THROUGH */ 376 default: 377 if (ibufp == hd) 378 return EOF; 379 else if (addr < 0 || addr_last < addr) { 380 seterrmsg("invalid address"); 381 return ERR; 382 } else 383 return addr; 384 } 385 /* NOTREACHED */ 386 } 387 388 389 #ifdef BACKWARDS 390 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 391 #define GET_THIRD_ADDR(addr) \ 392 { \ 393 long ol1, ol2; \ 394 \ 395 ol1 = first_addr, ol2 = second_addr; \ 396 if (extract_addr_range() < 0) \ 397 return ERR; \ 398 else if (addr_cnt == 0) { \ 399 seterrmsg("destination expected"); \ 400 return ERR; \ 401 } else if (second_addr < 0 || addr_last < second_addr) { \ 402 seterrmsg("invalid address"); \ 403 return ERR; \ 404 } \ 405 addr = second_addr; \ 406 first_addr = ol1, second_addr = ol2; \ 407 } 408 #else /* BACKWARDS */ 409 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 410 #define GET_THIRD_ADDR(addr) \ 411 { \ 412 long ol1, ol2; \ 413 \ 414 ol1 = first_addr, ol2 = second_addr; \ 415 if (extract_addr_range() < 0) \ 416 return ERR; \ 417 if (second_addr < 0 || addr_last < second_addr) { \ 418 seterrmsg("invalid address"); \ 419 return ERR; \ 420 } \ 421 addr = second_addr; \ 422 first_addr = ol1, second_addr = ol2; \ 423 } 424 #endif 425 426 427 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 428 #define GET_COMMAND_SUFFIX() { \ 429 int done = 0; \ 430 do { \ 431 switch(*ibufp) { \ 432 case 'p': \ 433 gflag |= GPR, ibufp++; \ 434 break; \ 435 case 'l': \ 436 gflag |= GLS, ibufp++; \ 437 break; \ 438 case 'n': \ 439 gflag |= GNP, ibufp++; \ 440 break; \ 441 default: \ 442 done++; \ 443 } \ 444 } while (!done); \ 445 if (*ibufp++ != '\n') { \ 446 seterrmsg("invalid command suffix"); \ 447 return ERR; \ 448 } \ 449 } 450 451 452 /* sflags */ 453 #define SGG 001 /* complement previous global substitute suffix */ 454 #define SGP 002 /* complement previous print suffix */ 455 #define SGR 004 /* use last regex instead of last pat */ 456 #define SGF 010 /* repeat last substitution */ 457 458 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 459 460 long rows = 22; /* scroll length: ws_row - 2 */ 461 462 /* exec_command: execute the next command in command buffer; return print 463 request, if any */ 464 int 465 exec_command(void) 466 { 467 static pattern_t *pat = NULL; 468 static int sgflag = 0; 469 static long sgnum = 0; 470 471 pattern_t *tpat; 472 char *fnp; 473 int gflag = 0; 474 int sflags = 0; 475 long addr = 0; 476 int n = 0; 477 int c; 478 479 SKIP_BLANKS(); 480 switch(c = *ibufp++) { 481 case 'a': 482 GET_COMMAND_SUFFIX(); 483 if (!isglobal) clear_undo_stack(); 484 if (append_lines(second_addr) < 0) 485 return ERR; 486 break; 487 case 'c': 488 if (check_addr_range(current_addr, current_addr) < 0) 489 return ERR; 490 GET_COMMAND_SUFFIX(); 491 if (!isglobal) clear_undo_stack(); 492 if (delete_lines(first_addr, second_addr) < 0 || 493 append_lines(current_addr) < 0) 494 return ERR; 495 break; 496 case 'd': 497 if (check_addr_range(current_addr, current_addr) < 0) 498 return ERR; 499 GET_COMMAND_SUFFIX(); 500 if (!isglobal) clear_undo_stack(); 501 if (delete_lines(first_addr, second_addr) < 0) 502 return ERR; 503 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 504 current_addr = addr; 505 break; 506 case 'e': 507 if (modified && !scripted) 508 return EMOD; 509 /* fall through */ 510 case 'E': 511 if (addr_cnt > 0) { 512 seterrmsg("unexpected address"); 513 return ERR; 514 } else if (!isspace((unsigned char)*ibufp)) { 515 seterrmsg("unexpected command suffix"); 516 return ERR; 517 } else if ((fnp = get_filename()) == NULL) 518 return ERR; 519 GET_COMMAND_SUFFIX(); 520 if (delete_lines(1, addr_last) < 0) 521 return ERR; 522 clear_undo_stack(); 523 if (close_sbuf() < 0) 524 return ERR; 525 else if (open_sbuf() < 0) 526 return FATAL; 527 if (*fnp && *fnp != '!') strlcpy(old_filename, fnp, 528 sizeof(old_filename) - 2); 529 #ifdef BACKWARDS 530 if (*fnp == '\0' && *old_filename == '\0') { 531 seterrmsg("no current filename"); 532 return ERR; 533 } 534 #endif 535 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 536 return ERR; 537 clear_undo_stack(); 538 modified = 0; 539 u_current_addr = u_addr_last = -1; 540 break; 541 case 'f': 542 if (addr_cnt > 0) { 543 seterrmsg("unexpected address"); 544 return ERR; 545 } else if (!isspace((unsigned char)*ibufp)) { 546 seterrmsg("unexpected command suffix"); 547 return ERR; 548 } else if ((fnp = get_filename()) == NULL) 549 return ERR; 550 else if (*fnp == '!') { 551 seterrmsg("invalid redirection"); 552 return ERR; 553 } 554 GET_COMMAND_SUFFIX(); 555 if (*fnp) strlcpy(old_filename, fnp, sizeof(old_filename) - 2); 556 printf("%s\n", strip_escapes(old_filename)); 557 break; 558 case 'g': 559 case 'v': 560 case 'G': 561 case 'V': 562 if (isglobal) { 563 seterrmsg("cannot nest global commands"); 564 return ERR; 565 } else if (check_addr_range(1, addr_last) < 0) 566 return ERR; 567 else if (build_active_list(c == 'g' || c == 'G') < 0) 568 return ERR; 569 else if ((n = (c == 'G' || c == 'V')) != 0) 570 GET_COMMAND_SUFFIX(); 571 isglobal++; 572 if (exec_global(n, gflag) < 0) 573 return ERR; 574 break; 575 case 'h': 576 if (addr_cnt > 0) { 577 seterrmsg("unexpected address"); 578 return ERR; 579 } 580 GET_COMMAND_SUFFIX(); 581 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 582 break; 583 case 'H': 584 if (addr_cnt > 0) { 585 seterrmsg("unexpected address"); 586 return ERR; 587 } 588 GET_COMMAND_SUFFIX(); 589 if ((garrulous = 1 - garrulous) && *errmsg) 590 fprintf(stderr, "%s\n", errmsg); 591 break; 592 case 'i': 593 if (second_addr == 0) { 594 seterrmsg("invalid address"); 595 return ERR; 596 } 597 GET_COMMAND_SUFFIX(); 598 if (!isglobal) clear_undo_stack(); 599 if (append_lines(second_addr - 1) < 0) 600 return ERR; 601 break; 602 case 'j': 603 if (check_addr_range(current_addr, current_addr + 1) < 0) 604 return ERR; 605 GET_COMMAND_SUFFIX(); 606 if (!isglobal) clear_undo_stack(); 607 if (first_addr != second_addr && 608 join_lines(first_addr, second_addr) < 0) 609 return ERR; 610 break; 611 case 'k': 612 c = *ibufp++; 613 if (second_addr == 0) { 614 seterrmsg("invalid address"); 615 return ERR; 616 } 617 GET_COMMAND_SUFFIX(); 618 if (mark_line_node(get_addressed_line_node(second_addr), (unsigned char)c) < 0) 619 return ERR; 620 break; 621 case 'l': 622 if (check_addr_range(current_addr, current_addr) < 0) 623 return ERR; 624 GET_COMMAND_SUFFIX(); 625 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 626 return ERR; 627 gflag = 0; 628 break; 629 case 'm': 630 if (check_addr_range(current_addr, current_addr) < 0) 631 return ERR; 632 GET_THIRD_ADDR(addr); 633 if (first_addr <= addr && addr < second_addr) { 634 seterrmsg("invalid destination"); 635 return ERR; 636 } 637 GET_COMMAND_SUFFIX(); 638 if (!isglobal) clear_undo_stack(); 639 if (move_lines(addr) < 0) 640 return ERR; 641 break; 642 case 'n': 643 if (check_addr_range(current_addr, current_addr) < 0) 644 return ERR; 645 GET_COMMAND_SUFFIX(); 646 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 647 return ERR; 648 gflag = 0; 649 break; 650 case 'p': 651 if (check_addr_range(current_addr, current_addr) < 0) 652 return ERR; 653 GET_COMMAND_SUFFIX(); 654 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 655 return ERR; 656 gflag = 0; 657 break; 658 case 'P': 659 if (addr_cnt > 0) { 660 seterrmsg("unexpected address"); 661 return ERR; 662 } 663 GET_COMMAND_SUFFIX(); 664 prompt = prompt ? NULL : optarg ? optarg : dps; 665 break; 666 case 'q': 667 case 'Q': 668 if (addr_cnt > 0) { 669 seterrmsg("unexpected address"); 670 return ERR; 671 } 672 GET_COMMAND_SUFFIX(); 673 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 674 break; 675 case 'r': 676 if (!isspace((unsigned char)*ibufp)) { 677 seterrmsg("unexpected command suffix"); 678 return ERR; 679 } else if (addr_cnt == 0) 680 second_addr = addr_last; 681 if ((fnp = get_filename()) == NULL) 682 return ERR; 683 GET_COMMAND_SUFFIX(); 684 if (!isglobal) clear_undo_stack(); 685 if (*old_filename == '\0' && *fnp != '!') 686 strlcpy(old_filename, fnp, sizeof(old_filename) - 2); 687 #ifdef BACKWARDS 688 if (*fnp == '\0' && *old_filename == '\0') { 689 seterrmsg("no current filename"); 690 return ERR; 691 } 692 #endif 693 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 694 return ERR; 695 else if (addr && addr != addr_last) 696 modified = 1; 697 break; 698 case 's': 699 do { 700 switch(*ibufp) { 701 case '\n': 702 sflags |=SGF; 703 break; 704 case 'g': 705 sflags |= SGG; 706 ibufp++; 707 break; 708 case 'p': 709 sflags |= SGP; 710 ibufp++; 711 break; 712 case 'r': 713 sflags |= SGR; 714 ibufp++; 715 break; 716 case '0': case '1': case '2': case '3': case '4': 717 case '5': case '6': case '7': case '8': case '9': 718 STRTOL(sgnum, ibufp); 719 sflags |= SGF; 720 sgflag &= ~GSG; /* override GSG */ 721 break; 722 default: 723 if (sflags) { 724 seterrmsg("invalid command suffix"); 725 return ERR; 726 } 727 } 728 } while (sflags && *ibufp != '\n'); 729 if (sflags && !pat) { 730 seterrmsg("no previous substitution"); 731 return ERR; 732 } else if (sflags & SGG) 733 sgnum = 0; /* override numeric arg */ 734 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 735 seterrmsg("invalid pattern delimiter"); 736 return ERR; 737 } 738 tpat = pat; 739 SPL1(); 740 if ((!sflags || (sflags & SGR)) && 741 (tpat = get_compiled_pattern()) == NULL) { 742 SPL0(); 743 return ERR; 744 } else if (tpat != pat) { 745 if (pat) { 746 regfree(pat); 747 free(pat); 748 } 749 pat = tpat; 750 patlock = 1; /* reserve pattern */ 751 } 752 SPL0(); 753 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 754 return ERR; 755 else if (isglobal) 756 sgflag |= GLB; 757 else 758 sgflag &= ~GLB; 759 if (sflags & SGG) 760 sgflag ^= GSG; 761 if (sflags & SGP) 762 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 763 do { 764 switch(*ibufp) { 765 case 'p': 766 sgflag |= GPR, ibufp++; 767 break; 768 case 'l': 769 sgflag |= GLS, ibufp++; 770 break; 771 case 'n': 772 sgflag |= GNP, ibufp++; 773 break; 774 default: 775 n++; 776 } 777 } while (!n); 778 if (check_addr_range(current_addr, current_addr) < 0) 779 return ERR; 780 GET_COMMAND_SUFFIX(); 781 if (!isglobal) clear_undo_stack(); 782 if (search_and_replace(pat, sgflag, sgnum) < 0) 783 return ERR; 784 break; 785 case 't': 786 if (check_addr_range(current_addr, current_addr) < 0) 787 return ERR; 788 GET_THIRD_ADDR(addr); 789 GET_COMMAND_SUFFIX(); 790 if (!isglobal) clear_undo_stack(); 791 if (copy_lines(addr) < 0) 792 return ERR; 793 break; 794 case 'u': 795 if (addr_cnt > 0) { 796 seterrmsg("unexpected address"); 797 return ERR; 798 } 799 GET_COMMAND_SUFFIX(); 800 if (pop_undo_stack() < 0) 801 return ERR; 802 break; 803 case 'w': 804 case 'W': 805 if ((n = *ibufp) == 'q' || n == 'Q') { 806 gflag = EOF; 807 ibufp++; 808 } 809 if (!isspace((unsigned char)*ibufp)) { 810 seterrmsg("unexpected command suffix"); 811 return ERR; 812 } else if ((fnp = get_filename()) == NULL) 813 return ERR; 814 if (addr_cnt == 0 && !addr_last) 815 first_addr = second_addr = 0; 816 else if (check_addr_range(1, addr_last) < 0) 817 return ERR; 818 GET_COMMAND_SUFFIX(); 819 if (*old_filename == '\0' && *fnp != '!') 820 strlcpy(old_filename, fnp, sizeof(old_filename) - 2); 821 #ifdef BACKWARDS 822 if (*fnp == '\0' && *old_filename == '\0') { 823 seterrmsg("no current filename"); 824 return ERR; 825 } 826 #endif 827 if ((addr = write_file(*fnp ? fnp : old_filename, 828 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 829 return ERR; 830 else if (addr == addr_last) 831 modified = 0; 832 else if (modified && !scripted && n == 'q') 833 gflag = EMOD; 834 break; 835 case 'x': 836 if (addr_cnt > 0) { 837 seterrmsg("unexpected address"); 838 return ERR; 839 } 840 GET_COMMAND_SUFFIX(); 841 #ifdef DES 842 des = get_keyword(); 843 #else 844 seterrmsg("crypt unavailable"); 845 return ERR; 846 #endif 847 break; 848 case 'z': 849 #ifdef BACKWARDS 850 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 851 #else 852 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 853 #endif 854 return ERR; 855 else if ('0' < *ibufp && *ibufp <= '9') 856 STRTOL(rows, ibufp); 857 GET_COMMAND_SUFFIX(); 858 if (display_lines(second_addr, min(addr_last, 859 second_addr + rows), gflag) < 0) 860 return ERR; 861 gflag = 0; 862 break; 863 case '=': 864 GET_COMMAND_SUFFIX(); 865 printf("%ld\n", addr_cnt ? second_addr : addr_last); 866 break; 867 case '!': 868 if (addr_cnt > 0) { 869 seterrmsg("unexpected address"); 870 return ERR; 871 } 872 if ((sflags = get_shell_command()) < 0) 873 return ERR; 874 GET_COMMAND_SUFFIX(); 875 if (sflags) printf("%s\n", shcmd + 1); 876 system(shcmd + 1); 877 if (!scripted) printf("!\n"); 878 break; 879 case '\n': 880 #ifdef BACKWARDS 881 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 882 #else 883 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 884 #endif 885 || display_lines(second_addr, second_addr, 0) < 0) 886 return ERR; 887 break; 888 default: 889 seterrmsg("unknown command"); 890 return ERR; 891 } 892 return gflag; 893 } 894 895 896 /* check_addr_range: return status of address range check */ 897 int 898 check_addr_range(long n, long m) 899 { 900 if (addr_cnt == 0) { 901 first_addr = n; 902 second_addr = m; 903 } 904 if (first_addr > second_addr || 1 > first_addr || 905 second_addr > addr_last) { 906 seterrmsg("invalid address"); 907 return ERR; 908 } 909 return 0; 910 } 911 912 913 /* get_matching_node_addr: return the address of the next line matching a 914 pattern in a given direction. wrap around begin/end of editor buffer if 915 necessary */ 916 long 917 get_matching_node_addr(pattern_t *pat, int dir) 918 { 919 char *s; 920 long n = current_addr; 921 line_t *lp; 922 923 if (!pat) return ERR; 924 do { 925 if ((n = dir ? INC_MOD(n, addr_last) : 926 DEC_MOD(n, addr_last)) != 0) { 927 lp = get_addressed_line_node(n); 928 if ((s = get_sbuf_line(lp)) == NULL) 929 return ERR; 930 if (isbinary) 931 NUL_TO_NEWLINE(s, lp->len); 932 if (!regexec(pat, s, 0, NULL, 0)) 933 return n; 934 } 935 } while (n != current_addr); 936 seterrmsg("no match"); 937 return ERR; 938 } 939 940 941 /* get_filename: return pointer to copy of filename in the command buffer */ 942 char * 943 get_filename(void) 944 { 945 static char *file = NULL; 946 static int filesz = 0; 947 948 int n; 949 950 if (*ibufp != '\n') { 951 SKIP_BLANKS(); 952 if (*ibufp == '\n') { 953 seterrmsg("invalid filename"); 954 return NULL; 955 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 956 return NULL; 957 else if (*ibufp == '!') { 958 ibufp++; 959 if ((n = get_shell_command()) < 0) 960 return NULL; 961 if (n) printf("%s\n", shcmd + 1); 962 return shcmd; 963 } else if (n - 1 > MAXPATHLEN) { 964 seterrmsg("filename too long"); 965 return NULL; 966 } 967 } 968 #ifndef BACKWARDS 969 else if (*old_filename == '\0') { 970 seterrmsg("no current filename"); 971 return NULL; 972 } 973 #endif 974 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 975 for (n = 0; *ibufp != '\n';) 976 file[n++] = *ibufp++; 977 file[n] = '\0'; 978 return is_legal_filename(file) ? file : NULL; 979 } 980 981 982 /* get_shell_command: read a shell command from stdin; return substitution 983 status */ 984 int 985 get_shell_command(void) 986 { 987 static char *buf = NULL; 988 static int n = 0; 989 990 char *s; /* substitution char pointer */ 991 int i = 0; 992 int j = 0; 993 994 if (red || secure) { 995 seterrmsg("shell access restricted"); 996 return ERR; 997 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 998 return ERR; 999 REALLOC(buf, n, j + 1, ERR); 1000 buf[i++] = '!'; /* prefix command w/ bang */ 1001 while (*ibufp != '\n') 1002 switch (*ibufp) { 1003 default: 1004 REALLOC(buf, n, i + 2, ERR); 1005 buf[i++] = *ibufp; 1006 if (*ibufp++ == '\\') 1007 buf[i++] = *ibufp++; 1008 break; 1009 case '!': 1010 if (s != ibufp) { 1011 REALLOC(buf, n, i + 1, ERR); 1012 buf[i++] = *ibufp++; 1013 } 1014 #ifdef BACKWARDS 1015 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1016 #else 1017 else if (shcmd == NULL) 1018 #endif 1019 { 1020 seterrmsg("no previous command"); 1021 return ERR; 1022 } else { 1023 REALLOC(buf, n, i + shcmdi, ERR); 1024 for (s = shcmd + 1; s < shcmd + shcmdi;) 1025 buf[i++] = *s++; 1026 s = ibufp++; 1027 } 1028 break; 1029 case '%': 1030 if (*old_filename == '\0') { 1031 seterrmsg("no current filename"); 1032 return ERR; 1033 } 1034 j = strlen(s = strip_escapes(old_filename)); 1035 REALLOC(buf, n, i + j, ERR); 1036 while (j--) 1037 buf[i++] = *s++; 1038 s = ibufp++; 1039 break; 1040 } 1041 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1042 memcpy(shcmd, buf, i); 1043 shcmd[shcmdi = i] = '\0'; 1044 return *s == '!' || *s == '%'; 1045 } 1046 1047 1048 /* append_lines: insert text from stdin to after line n; stop when either a 1049 single period is read or EOF; return status */ 1050 int 1051 append_lines(long n) 1052 { 1053 int l; 1054 char *lp = ibuf; 1055 char *eot; 1056 undo_t *up = NULL; 1057 1058 for (current_addr = n;;) { 1059 if (!isglobal) { 1060 if ((l = get_tty_line()) < 0) 1061 return ERR; 1062 else if (l == 0 || ibuf[l - 1] != '\n') { 1063 clearerr(stdin); 1064 return l ? EOF : 0; 1065 } 1066 lp = ibuf; 1067 } else if (*(lp = ibufp) == '\0') 1068 return 0; 1069 else { 1070 while (*ibufp++ != '\n') 1071 ; 1072 l = ibufp - lp; 1073 } 1074 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1075 return 0; 1076 } 1077 eot = lp + l; 1078 SPL1(); 1079 do { 1080 if ((lp = put_sbuf_line(lp)) == NULL) { 1081 SPL0(); 1082 return ERR; 1083 } else if (up) 1084 up->t = get_addressed_line_node(current_addr); 1085 else if ((up = push_undo_stack(UADD, current_addr, 1086 current_addr)) == NULL) { 1087 SPL0(); 1088 return ERR; 1089 } 1090 } while (lp != eot); 1091 modified = 1; 1092 SPL0(); 1093 } 1094 /* NOTREACHED */ 1095 } 1096 1097 1098 /* join_lines: replace a range of lines with the joined text of those lines */ 1099 int 1100 join_lines(long from, long to) 1101 { 1102 static char *buf = NULL; 1103 static int n; 1104 1105 char *s; 1106 int size = 0; 1107 line_t *bp, *ep; 1108 1109 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1110 bp = get_addressed_line_node(from); 1111 for (; bp != ep; bp = bp->q_forw) { 1112 if ((s = get_sbuf_line(bp)) == NULL) 1113 return ERR; 1114 REALLOC(buf, n, size + bp->len, ERR); 1115 memcpy(buf + size, s, bp->len); 1116 size += bp->len; 1117 } 1118 REALLOC(buf, n, size + 2, ERR); 1119 memcpy(buf + size, "\n", 2); 1120 if (delete_lines(from, to) < 0) 1121 return ERR; 1122 current_addr = from - 1; 1123 SPL1(); 1124 if (put_sbuf_line(buf) == NULL || 1125 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1126 SPL0(); 1127 return ERR; 1128 } 1129 modified = 1; 1130 SPL0(); 1131 return 0; 1132 } 1133 1134 1135 /* move_lines: move a range of lines */ 1136 int 1137 move_lines(long addr) 1138 { 1139 line_t *b1, *a1, *b2, *a2; 1140 long n = INC_MOD(second_addr, addr_last); 1141 long p = first_addr - 1; 1142 int done = (addr == first_addr - 1 || addr == second_addr); 1143 1144 SPL1(); 1145 if (done) { 1146 a2 = get_addressed_line_node(n); 1147 b2 = get_addressed_line_node(p); 1148 current_addr = second_addr; 1149 } else if (push_undo_stack(UMOV, p, n) == NULL || 1150 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1151 SPL0(); 1152 return ERR; 1153 } else { 1154 a1 = get_addressed_line_node(n); 1155 if (addr < first_addr) { 1156 b1 = get_addressed_line_node(p); 1157 b2 = get_addressed_line_node(addr); 1158 /* this get_addressed_line_node last! */ 1159 } else { 1160 b2 = get_addressed_line_node(addr); 1161 b1 = get_addressed_line_node(p); 1162 /* this get_addressed_line_node last! */ 1163 } 1164 a2 = b2->q_forw; 1165 REQUE(b2, b1->q_forw); 1166 REQUE(a1->q_back, a2); 1167 REQUE(b1, a1); 1168 current_addr = addr + ((addr < first_addr) ? 1169 second_addr - first_addr + 1 : 0); 1170 } 1171 if (isglobal) 1172 unset_active_nodes(b2->q_forw, a2); 1173 modified = 1; 1174 SPL0(); 1175 return 0; 1176 } 1177 1178 1179 /* copy_lines: copy a range of lines; return status */ 1180 int 1181 copy_lines(long addr) 1182 { 1183 line_t *lp, *np = get_addressed_line_node(first_addr); 1184 undo_t *up = NULL; 1185 long n = second_addr - first_addr + 1; 1186 long m = 0; 1187 1188 current_addr = addr; 1189 if (first_addr <= addr && addr < second_addr) { 1190 n = addr - first_addr + 1; 1191 m = second_addr - addr; 1192 } 1193 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1194 for (; n-- > 0; np = np->q_forw) { 1195 SPL1(); 1196 if ((lp = dup_line_node(np)) == NULL) { 1197 SPL0(); 1198 return ERR; 1199 } 1200 add_line_node(lp); 1201 if (up) 1202 up->t = lp; 1203 else if ((up = push_undo_stack(UADD, current_addr, 1204 current_addr)) == NULL) { 1205 SPL0(); 1206 return ERR; 1207 } 1208 modified = 1; 1209 SPL0(); 1210 } 1211 return 0; 1212 } 1213 1214 1215 /* delete_lines: delete a range of lines */ 1216 int 1217 delete_lines(long from, long to) 1218 { 1219 line_t *n, *p; 1220 1221 SPL1(); 1222 if (push_undo_stack(UDEL, from, to) == NULL) { 1223 SPL0(); 1224 return ERR; 1225 } 1226 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1227 p = get_addressed_line_node(from - 1); 1228 /* this get_addressed_line_node last! */ 1229 if (isglobal) 1230 unset_active_nodes(p->q_forw, n); 1231 REQUE(p, n); 1232 addr_last -= to - from + 1; 1233 current_addr = from - 1; 1234 modified = 1; 1235 SPL0(); 1236 return 0; 1237 } 1238 1239 1240 /* display_lines: print a range of lines to stdout */ 1241 int 1242 display_lines(long from, long to, int gflag) 1243 { 1244 line_t *bp; 1245 line_t *ep; 1246 char *s; 1247 1248 if (!from) { 1249 seterrmsg("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(line_t *lp, int n) 1272 { 1273 if (!islower(n)) { 1274 seterrmsg("invalid mark character"); 1275 return ERR; 1276 } else if (mark[n - 'a'] == NULL) 1277 markno++; 1278 mark[n - 'a'] = lp; 1279 return 0; 1280 } 1281 1282 1283 /* get_marked_node_addr: return address of a marked line */ 1284 long 1285 get_marked_node_addr(int n) 1286 { 1287 if (!islower(n)) { 1288 seterrmsg("invalid mark character"); 1289 return ERR; 1290 } 1291 return get_line_node_addr(mark[n - 'a']); 1292 } 1293 1294 1295 /* unmark_line_node: clear line node mark */ 1296 void 1297 unmark_line_node(line_t *lp) 1298 { 1299 int i; 1300 1301 for (i = 0; markno && i < MAXMARK; i++) 1302 if (mark[i] == lp) { 1303 mark[i] = NULL; 1304 markno--; 1305 } 1306 } 1307 1308 1309 /* dup_line_node: return a pointer to a copy of a line node */ 1310 line_t * 1311 dup_line_node(line_t *lp) 1312 { 1313 line_t *np; 1314 1315 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1316 fprintf(stderr, "%s\n", strerror(errno)); 1317 seterrmsg("out of memory"); 1318 return NULL; 1319 } 1320 np->seek = lp->seek; 1321 np->len = lp->len; 1322 return np; 1323 } 1324 1325 1326 /* has_trailing_escape: return the parity of escapes preceding a character 1327 in a string */ 1328 int 1329 has_trailing_escape(char *s, char *t) 1330 { 1331 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1332 } 1333 1334 1335 /* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1336 char * 1337 strip_escapes(const char *s) 1338 { 1339 static char *file = NULL; 1340 static int filesz = 0; 1341 1342 int i = 0; 1343 1344 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 1345 while ((i < (filesz - 1)) && 1346 (file[i++] = (*s == '\\') != '\0' ? *++s : *s)) 1347 s++; 1348 file[filesz - 1] = '\0'; 1349 return file; 1350 } 1351 1352 1353 void 1354 signal_hup(int signo) 1355 { 1356 if (mutex) 1357 sigflags |= (1 << (signo - 1)); 1358 else handle_hup(signo); 1359 } 1360 1361 1362 void 1363 signal_int(int signo) 1364 { 1365 if (mutex) 1366 sigflags |= (1 << (signo - 1)); 1367 else handle_int(signo); 1368 } 1369 1370 1371 void 1372 handle_hup(int signo) 1373 { 1374 char *hup = NULL; /* hup filename */ 1375 char *s; 1376 int n; 1377 1378 if (!sigactive) 1379 quit(1); 1380 sigflags &= ~(1 << (signo - 1)); 1381 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1382 (s = getenv("HOME")) != NULL && 1383 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */ 1384 (hup = (char *) malloc(n + 10)) != NULL) { 1385 strcpy(hup, s); 1386 if (hup[n - 1] != '/') 1387 hup[n] = '/', hup[n+1] = '\0'; 1388 strcat(hup, "ed.hup"); 1389 write_file(hup, "w", 1, addr_last); 1390 } 1391 quit(2); 1392 } 1393 1394 1395 void 1396 handle_int(int signo) 1397 { 1398 if (!sigactive) 1399 quit(1); 1400 sigflags &= ~(1 << (signo - 1)); 1401 #ifdef _POSIX_SOURCE 1402 siglongjmp(env, -1); 1403 #else 1404 longjmp(env, -1); 1405 #endif 1406 } 1407 1408 1409 int cols = 72; /* wrap column */ 1410 1411 void 1412 handle_winch(int signo) 1413 { 1414 struct winsize ws; /* window size structure */ 1415 1416 sigflags &= ~(1 << (signo - 1)); 1417 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1418 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1419 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1420 } 1421 } 1422 1423 1424 /* is_legal_filename: return a legal filename */ 1425 int 1426 is_legal_filename(char *s) 1427 { 1428 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1429 seterrmsg("shell access restricted"); 1430 return 0; 1431 } 1432 return 1; 1433 } 1434
Indexes created Sun Sep 21 20:09:37 GMT 2025