1 /* $NetBSD: main.c,v 1.17 2005/06/26 19:10:49 christos 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. \n\ 35 All rights reserved.\n"); 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 1.17 2005/06/26 19:10:49 christos 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 sigflags = 0; /* if set, signals received while mutex set */ 98 int sigactive = 0; /* if set, signal handlers are enabled */ 99 100 char old_filename[MAXPATHLEN + 1] = ""; /* default filename */ 101 long current_addr; /* current address in editor buffer */ 102 long addr_last; /* last address in editor buffer */ 103 int lineno; /* script line number */ 104 const char *prompt; /* command-line prompt */ 105 const char *dps = "*"; /* default command-line prompt */ 106 107 const char *usage = "usage: %s [-] [-sxE] [-p string] [name]\n"; 108 109 /* ed: line editor */ 110 int 111 main(int argc, char *argv[]) 112 { 113 int c, n; 114 long status = 0; 115 #ifdef __GNUC__ 116 (void) &argc; 117 (void) &argv; 118 #endif 119 120 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 121 top: 122 while ((c = getopt(argc, argv, "p:sxE")) != -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 default: 142 fprintf(stderr, usage, argv[0]); 143 exit(1); 144 /* NOTREACHED */ 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)) != 0) 167 #else 168 if ((status = setjmp(env)) != 0) 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 strcpy(old_filename, *argv); 181 } else if (argc) { 182 fputs("?\n", stderr); 183 if (**argv == '\0') 184 sprintf(errmsg, "invalid filename"); 185 if (!isatty(0)) 186 quit(2); 187 } 188 } 189 for (;;) { 190 if (status < 0 && garrulous) 191 fprintf(stderr, "%s\n", errmsg); 192 if (prompt) { 193 printf("%s", prompt); 194 fflush(stdout); 195 } 196 if ((n = get_tty_line()) < 0) { 197 status = ERR; 198 continue; 199 } else if (n == 0) { 200 if (modified && !scripted) { 201 fputs("?\n", stderr); 202 sprintf(errmsg, "warning: file modified"); 203 if (!isatty(0)) { 204 fprintf(stderr, garrulous ? 205 "script, line %d: %s\n" : 206 "", lineno, errmsg); 207 quit(2); 208 } 209 clearerr(stdin); 210 modified = 0; 211 status = EMOD; 212 continue; 213 } else 214 quit(0); 215 } else if (ibuf[n - 1] != '\n') { 216 /* discard line */ 217 sprintf(errmsg, "unexpected end-of-file"); 218 clearerr(stdin); 219 status = ERR; 220 continue; 221 } 222 isglobal = 0; 223 if ((status = extract_addr_range()) >= 0 && 224 (status = exec_command()) >= 0) 225 if (!status || (status && 226 (status = display_lines(current_addr, current_addr, 227 status))) >= 0) 228 continue; 229 switch (status) { 230 case EOF: 231 quit(0); 232 case EMOD: 233 modified = 0; 234 fputs("?\n", stderr); /* give warning */ 235 sprintf(errmsg, "warning: file modified"); 236 if (!isatty(0)) { 237 fprintf(stderr, garrulous ? 238 "script, line %d: %s\n" : 239 "", lineno, errmsg); 240 quit(2); 241 } 242 break; 243 case FATAL: 244 if (!isatty(0)) 245 fprintf(stderr, garrulous ? 246 "script, line %d: %s\n" : "", 247 lineno, errmsg); 248 else 249 fprintf(stderr, garrulous ? "%s\n" : "", 250 errmsg); 251 quit(3); 252 default: 253 fputs("?\n", stderr); 254 if (!isatty(0)) { 255 fprintf(stderr, garrulous ? 256 "script, line %d: %s\n" : "", 257 lineno, errmsg); 258 quit(2); 259 } 260 break; 261 } 262 } 263 /* NOTREACHED */ 264 } 265 266 long first_addr, second_addr, addr_cnt; 267 268 /* extract_addr_range: get line addresses from the command buffer until an 269 illegal address is seen; return status */ 270 int 271 extract_addr_range(void) 272 { 273 long addr; 274 275 addr_cnt = 0; 276 first_addr = second_addr = current_addr; 277 while ((addr = next_addr()) >= 0) { 278 addr_cnt++; 279 first_addr = second_addr; 280 second_addr = addr; 281 if (*ibufp != ',' && *ibufp != ';') 282 break; 283 else if (*ibufp++ == ';') 284 current_addr = addr; 285 } 286 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 287 first_addr = second_addr; 288 return (addr == ERR) ? ERR : 0; 289 } 290 291 292 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') \ 293 ibufp++ 294 295 #define MUST_BE_FIRST() \ 296 if (!first) { sprintf(errmsg, "invalid address"); return ERR; } 297 298 /* next_addr: return the next line address in the command buffer */ 299 long 300 next_addr(void) 301 { 302 char *hd; 303 long addr = current_addr; 304 long n; 305 int first = 1; 306 int c; 307 308 SKIP_BLANKS(); 309 for (hd = ibufp;; first = 0) 310 switch (c = *ibufp) { 311 case '+': 312 case '\t': 313 case ' ': 314 case '-': 315 case '^': 316 ibufp++; 317 SKIP_BLANKS(); 318 if (isdigit((unsigned char)*ibufp)) { 319 STRTOL(n, ibufp); 320 addr += (c == '-' || c == '^') ? -n : n; 321 } else if (!isspace((unsigned char)c)) 322 addr += (c == '-' || c == '^') ? -1 : 1; 323 break; 324 case '0': case '1': case '2': 325 case '3': case '4': case '5': 326 case '6': case '7': case '8': case '9': 327 MUST_BE_FIRST(); 328 STRTOL(addr, ibufp); 329 break; 330 case '.': 331 case '$': 332 MUST_BE_FIRST(); 333 ibufp++; 334 addr = (c == '.') ? current_addr : addr_last; 335 break; 336 case '/': 337 case '?': 338 MUST_BE_FIRST(); 339 if ((addr = get_matching_node_addr( 340 get_compiled_pattern(), c == '/')) < 0) 341 return ERR; 342 else if (c == *ibufp) 343 ibufp++; 344 break; 345 case '\'': 346 MUST_BE_FIRST(); 347 ibufp++; 348 if ((addr = get_marked_node_addr((unsigned char)*ibufp++)) < 0) 349 return ERR; 350 break; 351 case '%': 352 case ',': 353 case ';': 354 if (first) { 355 ibufp++; 356 addr_cnt++; 357 second_addr = (c == ';') ? current_addr : 1; 358 addr = addr_last; 359 break; 360 } 361 /* FALL THROUGH */ 362 default: 363 if (ibufp == hd) 364 return EOF; 365 else if (addr < 0 || addr_last < addr) { 366 sprintf(errmsg, "invalid address"); 367 return ERR; 368 } else 369 return addr; 370 } 371 /* NOTREACHED */ 372 } 373 374 375 #ifdef BACKWARDS 376 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 377 #define GET_THIRD_ADDR(addr) \ 378 { \ 379 long ol1, ol2; \ 380 \ 381 ol1 = first_addr, ol2 = second_addr; \ 382 if (extract_addr_range() < 0) \ 383 return ERR; \ 384 else if (addr_cnt == 0) { \ 385 sprintf(errmsg, "destination expected"); \ 386 return ERR; \ 387 } else if (second_addr < 0 || addr_last < second_addr) { \ 388 sprintf(errmsg, "invalid address"); \ 389 return ERR; \ 390 } \ 391 addr = second_addr; \ 392 first_addr = ol1, second_addr = ol2; \ 393 } 394 #else /* BACKWARDS */ 395 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 396 #define GET_THIRD_ADDR(addr) \ 397 { \ 398 long ol1, ol2; \ 399 \ 400 ol1 = first_addr, ol2 = second_addr; \ 401 if (extract_addr_range() < 0) \ 402 return ERR; \ 403 if (second_addr < 0 || addr_last < second_addr) { \ 404 sprintf(errmsg, "invalid address"); \ 405 return ERR; \ 406 } \ 407 addr = second_addr; \ 408 first_addr = ol1, second_addr = ol2; \ 409 } 410 #endif 411 412 413 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 414 #define GET_COMMAND_SUFFIX() { \ 415 int done = 0; \ 416 do { \ 417 switch(*ibufp) { \ 418 case 'p': \ 419 gflag |= GPR, ibufp++; \ 420 break; \ 421 case 'l': \ 422 gflag |= GLS, ibufp++; \ 423 break; \ 424 case 'n': \ 425 gflag |= GNP, ibufp++; \ 426 break; \ 427 default: \ 428 done++; \ 429 } \ 430 } while (!done); \ 431 if (*ibufp++ != '\n') { \ 432 sprintf(errmsg, "invalid command suffix"); \ 433 return ERR; \ 434 } \ 435 } 436 437 438 /* sflags */ 439 #define SGG 001 /* complement previous global substitute suffix */ 440 #define SGP 002 /* complement previous print suffix */ 441 #define SGR 004 /* use last regex instead of last pat */ 442 #define SGF 010 /* repeat last substitution */ 443 444 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 445 446 long rows = 22; /* scroll length: ws_row - 2 */ 447 448 /* exec_command: execute the next command in command buffer; return print 449 request, if any */ 450 int 451 exec_command(void) 452 { 453 static pattern_t *pat = NULL; 454 static int sgflag = 0; 455 static long sgnum = 0; 456 457 pattern_t *tpat; 458 char *fnp; 459 int gflag = 0; 460 int sflags = 0; 461 long addr = 0; 462 int n = 0; 463 int c; 464 465 SKIP_BLANKS(); 466 switch(c = *ibufp++) { 467 case 'a': 468 GET_COMMAND_SUFFIX(); 469 if (!isglobal) clear_undo_stack(); 470 if (append_lines(second_addr) < 0) 471 return ERR; 472 break; 473 case 'c': 474 if (check_addr_range(current_addr, current_addr) < 0) 475 return ERR; 476 GET_COMMAND_SUFFIX(); 477 if (!isglobal) clear_undo_stack(); 478 if (delete_lines(first_addr, second_addr) < 0 || 479 append_lines(current_addr) < 0) 480 return ERR; 481 break; 482 case 'd': 483 if (check_addr_range(current_addr, current_addr) < 0) 484 return ERR; 485 GET_COMMAND_SUFFIX(); 486 if (!isglobal) clear_undo_stack(); 487 if (delete_lines(first_addr, second_addr) < 0) 488 return ERR; 489 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 490 current_addr = addr; 491 break; 492 case 'e': 493 if (modified && !scripted) 494 return EMOD; 495 /* fall through */ 496 case 'E': 497 if (addr_cnt > 0) { 498 sprintf(errmsg, "unexpected address"); 499 return ERR; 500 } else if (!isspace((unsigned char)*ibufp)) { 501 sprintf(errmsg, "unexpected command suffix"); 502 return ERR; 503 } else if ((fnp = get_filename()) == NULL) 504 return ERR; 505 GET_COMMAND_SUFFIX(); 506 if (delete_lines(1, addr_last) < 0) 507 return ERR; 508 clear_undo_stack(); 509 if (close_sbuf() < 0) 510 return ERR; 511 else if (open_sbuf() < 0) 512 return FATAL; 513 if (*fnp && *fnp != '!') strcpy(old_filename, fnp); 514 #ifdef BACKWARDS 515 if (*fnp == '\0' && *old_filename == '\0') { 516 sprintf(errmsg, "no current filename"); 517 return ERR; 518 } 519 #endif 520 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 521 return ERR; 522 clear_undo_stack(); 523 modified = 0; 524 u_current_addr = u_addr_last = -1; 525 break; 526 case 'f': 527 if (addr_cnt > 0) { 528 sprintf(errmsg, "unexpected address"); 529 return ERR; 530 } else if (!isspace((unsigned char)*ibufp)) { 531 sprintf(errmsg, "unexpected command suffix"); 532 return ERR; 533 } else if ((fnp = get_filename()) == NULL) 534 return ERR; 535 else if (*fnp == '!') { 536 sprintf(errmsg, "invalid redirection"); 537 return ERR; 538 } 539 GET_COMMAND_SUFFIX(); 540 if (*fnp) strcpy(old_filename, fnp); 541 printf("%s\n", strip_escapes(old_filename)); 542 break; 543 case 'g': 544 case 'v': 545 case 'G': 546 case 'V': 547 if (isglobal) { 548 sprintf(errmsg, "cannot nest global commands"); 549 return ERR; 550 } else if (check_addr_range(1, addr_last) < 0) 551 return ERR; 552 else if (build_active_list(c == 'g' || c == 'G') < 0) 553 return ERR; 554 else if ((n = (c == 'G' || c == 'V')) != 0) 555 GET_COMMAND_SUFFIX(); 556 isglobal++; 557 if (exec_global(n, gflag) < 0) 558 return ERR; 559 break; 560 case 'h': 561 if (addr_cnt > 0) { 562 sprintf(errmsg, "unexpected address"); 563 return ERR; 564 } 565 GET_COMMAND_SUFFIX(); 566 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 567 break; 568 case 'H': 569 if (addr_cnt > 0) { 570 sprintf(errmsg, "unexpected address"); 571 return ERR; 572 } 573 GET_COMMAND_SUFFIX(); 574 if ((garrulous = 1 - garrulous) && *errmsg) 575 fprintf(stderr, "%s\n", errmsg); 576 break; 577 case 'i': 578 if (second_addr == 0) { 579 sprintf(errmsg, "invalid address"); 580 return ERR; 581 } 582 GET_COMMAND_SUFFIX(); 583 if (!isglobal) clear_undo_stack(); 584 if (append_lines(second_addr - 1) < 0) 585 return ERR; 586 break; 587 case 'j': 588 if (check_addr_range(current_addr, current_addr + 1) < 0) 589 return ERR; 590 GET_COMMAND_SUFFIX(); 591 if (!isglobal) clear_undo_stack(); 592 if (first_addr != second_addr && 593 join_lines(first_addr, second_addr) < 0) 594 return ERR; 595 break; 596 case 'k': 597 c = *ibufp++; 598 if (second_addr == 0) { 599 sprintf(errmsg, "invalid address"); 600 return ERR; 601 } 602 GET_COMMAND_SUFFIX(); 603 if (mark_line_node(get_addressed_line_node(second_addr), (unsigned char)c) < 0) 604 return ERR; 605 break; 606 case 'l': 607 if (check_addr_range(current_addr, current_addr) < 0) 608 return ERR; 609 GET_COMMAND_SUFFIX(); 610 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 611 return ERR; 612 gflag = 0; 613 break; 614 case 'm': 615 if (check_addr_range(current_addr, current_addr) < 0) 616 return ERR; 617 GET_THIRD_ADDR(addr); 618 if (first_addr <= addr && addr < second_addr) { 619 sprintf(errmsg, "invalid destination"); 620 return ERR; 621 } 622 GET_COMMAND_SUFFIX(); 623 if (!isglobal) clear_undo_stack(); 624 if (move_lines(addr) < 0) 625 return ERR; 626 break; 627 case 'n': 628 if (check_addr_range(current_addr, current_addr) < 0) 629 return ERR; 630 GET_COMMAND_SUFFIX(); 631 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 632 return ERR; 633 gflag = 0; 634 break; 635 case 'p': 636 if (check_addr_range(current_addr, current_addr) < 0) 637 return ERR; 638 GET_COMMAND_SUFFIX(); 639 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 640 return ERR; 641 gflag = 0; 642 break; 643 case 'P': 644 if (addr_cnt > 0) { 645 sprintf(errmsg, "unexpected address"); 646 return ERR; 647 } 648 GET_COMMAND_SUFFIX(); 649 prompt = prompt ? NULL : optarg ? optarg : dps; 650 break; 651 case 'q': 652 case 'Q': 653 if (addr_cnt > 0) { 654 sprintf(errmsg, "unexpected address"); 655 return ERR; 656 } 657 GET_COMMAND_SUFFIX(); 658 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 659 break; 660 case 'r': 661 if (!isspace((unsigned char)*ibufp)) { 662 sprintf(errmsg, "unexpected command suffix"); 663 return ERR; 664 } else if (addr_cnt == 0) 665 second_addr = addr_last; 666 if ((fnp = get_filename()) == NULL) 667 return ERR; 668 GET_COMMAND_SUFFIX(); 669 if (!isglobal) clear_undo_stack(); 670 if (*old_filename == '\0' && *fnp != '!') 671 strcpy(old_filename, fnp); 672 #ifdef BACKWARDS 673 if (*fnp == '\0' && *old_filename == '\0') { 674 sprintf(errmsg, "no current filename"); 675 return ERR; 676 } 677 #endif 678 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 679 return ERR; 680 else if (addr && addr != addr_last) 681 modified = 1; 682 break; 683 case 's': 684 do { 685 switch(*ibufp) { 686 case '\n': 687 sflags |=SGF; 688 break; 689 case 'g': 690 sflags |= SGG; 691 ibufp++; 692 break; 693 case 'p': 694 sflags |= SGP; 695 ibufp++; 696 break; 697 case 'r': 698 sflags |= SGR; 699 ibufp++; 700 break; 701 case '0': case '1': case '2': case '3': case '4': 702 case '5': case '6': case '7': case '8': case '9': 703 STRTOL(sgnum, ibufp); 704 sflags |= SGF; 705 sgflag &= ~GSG; /* override GSG */ 706 break; 707 default: 708 if (sflags) { 709 sprintf(errmsg, "invalid command suffix"); 710 return ERR; 711 } 712 } 713 } while (sflags && *ibufp != '\n'); 714 if (sflags && !pat) { 715 sprintf(errmsg, "no previous substitution"); 716 return ERR; 717 } else if (sflags & SGG) 718 sgnum = 0; /* override numeric arg */ 719 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 720 sprintf(errmsg, "invalid pattern delimiter"); 721 return ERR; 722 } 723 tpat = pat; 724 SPL1(); 725 if ((!sflags || (sflags & SGR)) && 726 (tpat = get_compiled_pattern()) == NULL) { 727 SPL0(); 728 return ERR; 729 } else if (tpat != pat) { 730 if (pat) { 731 regfree(pat); 732 free(pat); 733 } 734 pat = tpat; 735 patlock = 1; /* reserve pattern */ 736 } 737 SPL0(); 738 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 739 return ERR; 740 else if (isglobal) 741 sgflag |= GLB; 742 else 743 sgflag &= ~GLB; 744 if (sflags & SGG) 745 sgflag ^= GSG; 746 if (sflags & SGP) 747 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 748 do { 749 switch(*ibufp) { 750 case 'p': 751 sgflag |= GPR, ibufp++; 752 break; 753 case 'l': 754 sgflag |= GLS, ibufp++; 755 break; 756 case 'n': 757 sgflag |= GNP, ibufp++; 758 break; 759 default: 760 n++; 761 } 762 } while (!n); 763 if (check_addr_range(current_addr, current_addr) < 0) 764 return ERR; 765 GET_COMMAND_SUFFIX(); 766 if (!isglobal) clear_undo_stack(); 767 if (search_and_replace(pat, sgflag, sgnum) < 0) 768 return ERR; 769 break; 770 case 't': 771 if (check_addr_range(current_addr, current_addr) < 0) 772 return ERR; 773 GET_THIRD_ADDR(addr); 774 GET_COMMAND_SUFFIX(); 775 if (!isglobal) clear_undo_stack(); 776 if (copy_lines(addr) < 0) 777 return ERR; 778 break; 779 case 'u': 780 if (addr_cnt > 0) { 781 sprintf(errmsg, "unexpected address"); 782 return ERR; 783 } 784 GET_COMMAND_SUFFIX(); 785 if (pop_undo_stack() < 0) 786 return ERR; 787 break; 788 case 'w': 789 case 'W': 790 if ((n = *ibufp) == 'q' || n == 'Q') { 791 gflag = EOF; 792 ibufp++; 793 } 794 if (!isspace((unsigned char)*ibufp)) { 795 sprintf(errmsg, "unexpected command suffix"); 796 return ERR; 797 } else if ((fnp = get_filename()) == NULL) 798 return ERR; 799 if (addr_cnt == 0 && !addr_last) 800 first_addr = second_addr = 0; 801 else if (check_addr_range(1, addr_last) < 0) 802 return ERR; 803 GET_COMMAND_SUFFIX(); 804 if (*old_filename == '\0' && *fnp != '!') 805 strcpy(old_filename, fnp); 806 #ifdef BACKWARDS 807 if (*fnp == '\0' && *old_filename == '\0') { 808 sprintf(errmsg, "no current filename"); 809 return ERR; 810 } 811 #endif 812 if ((addr = write_file(*fnp ? fnp : old_filename, 813 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 814 return ERR; 815 else if (addr == addr_last) 816 modified = 0; 817 else if (modified && !scripted && n == 'q') 818 gflag = EMOD; 819 break; 820 case 'x': 821 if (addr_cnt > 0) { 822 sprintf(errmsg, "unexpected address"); 823 return ERR; 824 } 825 GET_COMMAND_SUFFIX(); 826 #ifdef DES 827 des = get_keyword(); 828 #else 829 sprintf(errmsg, "crypt unavailable"); 830 return ERR; 831 #endif 832 break; 833 case 'z': 834 #ifdef BACKWARDS 835 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 836 #else 837 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 838 #endif 839 return ERR; 840 else if ('0' < *ibufp && *ibufp <= '9') 841 STRTOL(rows, ibufp); 842 GET_COMMAND_SUFFIX(); 843 if (display_lines(second_addr, min(addr_last, 844 second_addr + rows), gflag) < 0) 845 return ERR; 846 gflag = 0; 847 break; 848 case '=': 849 GET_COMMAND_SUFFIX(); 850 printf("%ld\n", addr_cnt ? second_addr : addr_last); 851 break; 852 case '!': 853 if (addr_cnt > 0) { 854 sprintf(errmsg, "unexpected address"); 855 return ERR; 856 } else if ((sflags = get_shell_command()) < 0) 857 return ERR; 858 GET_COMMAND_SUFFIX(); 859 if (sflags) printf("%s\n", shcmd + 1); 860 system(shcmd + 1); 861 if (!scripted) printf("!\n"); 862 break; 863 case '\n': 864 #ifdef BACKWARDS 865 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 866 #else 867 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 868 #endif 869 || display_lines(second_addr, second_addr, 0) < 0) 870 return ERR; 871 break; 872 default: 873 sprintf(errmsg, "unknown command"); 874 return ERR; 875 } 876 return gflag; 877 } 878 879 880 /* check_addr_range: return status of address range check */ 881 int 882 check_addr_range(long n, long m) 883 { 884 if (addr_cnt == 0) { 885 first_addr = n; 886 second_addr = m; 887 } 888 if (first_addr > second_addr || 1 > first_addr || 889 second_addr > addr_last) { 890 sprintf(errmsg, "invalid address"); 891 return ERR; 892 } 893 return 0; 894 } 895 896 897 /* get_matching_node_addr: return the address of the next line matching a 898 pattern in a given direction. wrap around begin/end of editor buffer if 899 necessary */ 900 long 901 get_matching_node_addr(pattern_t *pat, int dir) 902 { 903 char *s; 904 long n = current_addr; 905 line_t *lp; 906 907 if (!pat) return ERR; 908 do { 909 if ((n = dir ? INC_MOD(n, addr_last) : 910 DEC_MOD(n, addr_last)) != 0) { 911 lp = get_addressed_line_node(n); 912 if ((s = get_sbuf_line(lp)) == NULL) 913 return ERR; 914 if (isbinary) 915 NUL_TO_NEWLINE(s, lp->len); 916 if (!regexec(pat, s, 0, NULL, 0)) 917 return n; 918 } 919 } while (n != current_addr); 920 sprintf(errmsg, "no match"); 921 return ERR; 922 } 923 924 925 /* get_filename: return pointer to copy of filename in the command buffer */ 926 char * 927 get_filename(void) 928 { 929 static char *file = NULL; 930 static int filesz = 0; 931 932 int n; 933 934 if (*ibufp != '\n') { 935 SKIP_BLANKS(); 936 if (*ibufp == '\n') { 937 sprintf(errmsg, "invalid filename"); 938 return NULL; 939 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 940 return NULL; 941 else if (*ibufp == '!') { 942 ibufp++; 943 if ((n = get_shell_command()) < 0) 944 return NULL; 945 if (n) printf("%s\n", shcmd + 1); 946 return shcmd; 947 } else if (n - 1 > MAXPATHLEN) { 948 sprintf(errmsg, "filename too long"); 949 return NULL; 950 } 951 } 952 #ifndef BACKWARDS 953 else if (*old_filename == '\0') { 954 sprintf(errmsg, "no current filename"); 955 return NULL; 956 } 957 #endif 958 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 959 for (n = 0; *ibufp != '\n';) 960 file[n++] = *ibufp++; 961 file[n] = '\0'; 962 return is_legal_filename(file) ? file : NULL; 963 } 964 965 966 /* get_shell_command: read a shell command from stdin; return substitution 967 status */ 968 int 969 get_shell_command(void) 970 { 971 static char *buf = NULL; 972 static int n = 0; 973 974 char *s; /* substitution char pointer */ 975 int i = 0; 976 int j = 0; 977 978 if (red) { 979 sprintf(errmsg, "shell access restricted"); 980 return ERR; 981 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 982 return ERR; 983 REALLOC(buf, n, j + 1, ERR); 984 buf[i++] = '!'; /* prefix command w/ bang */ 985 while (*ibufp != '\n') 986 switch (*ibufp) { 987 default: 988 REALLOC(buf, n, i + 2, ERR); 989 buf[i++] = *ibufp; 990 if (*ibufp++ == '\\') 991 buf[i++] = *ibufp++; 992 break; 993 case '!': 994 if (s != ibufp) { 995 REALLOC(buf, n, i + 1, ERR); 996 buf[i++] = *ibufp++; 997 } 998 #ifdef BACKWARDS 999 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1000 #else 1001 else if (shcmd == NULL) 1002 #endif 1003 { 1004 sprintf(errmsg, "no previous command"); 1005 return ERR; 1006 } else { 1007 REALLOC(buf, n, i + shcmdi, ERR); 1008 for (s = shcmd + 1; s < shcmd + shcmdi;) 1009 buf[i++] = *s++; 1010 s = ibufp++; 1011 } 1012 break; 1013 case '%': 1014 if (*old_filename == '\0') { 1015 sprintf(errmsg, "no current filename"); 1016 return ERR; 1017 } 1018 j = strlen(s = strip_escapes(old_filename)); 1019 REALLOC(buf, n, i + j, ERR); 1020 while (j--) 1021 buf[i++] = *s++; 1022 s = ibufp++; 1023 break; 1024 } 1025 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1026 memcpy(shcmd, buf, i); 1027 shcmd[shcmdi = i] = '\0'; 1028 return *s == '!' || *s == '%'; 1029 } 1030 1031 1032 /* append_lines: insert text from stdin to after line n; stop when either a 1033 single period is read or EOF; return status */ 1034 int 1035 append_lines(long n) 1036 { 1037 int l; 1038 char *lp = ibuf; 1039 char *eot; 1040 undo_t *up = NULL; 1041 1042 for (current_addr = n;;) { 1043 if (!isglobal) { 1044 if ((l = get_tty_line()) < 0) 1045 return ERR; 1046 else if (l == 0 || ibuf[l - 1] != '\n') { 1047 clearerr(stdin); 1048 return l ? EOF : 0; 1049 } 1050 lp = ibuf; 1051 } else if (*(lp = ibufp) == '\0') 1052 return 0; 1053 else { 1054 while (*ibufp++ != '\n') 1055 ; 1056 l = ibufp - lp; 1057 } 1058 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1059 return 0; 1060 } 1061 eot = lp + l; 1062 SPL1(); 1063 do { 1064 if ((lp = put_sbuf_line(lp)) == NULL) { 1065 SPL0(); 1066 return ERR; 1067 } else if (up) 1068 up->t = get_addressed_line_node(current_addr); 1069 else if ((up = push_undo_stack(UADD, current_addr, 1070 current_addr)) == NULL) { 1071 SPL0(); 1072 return ERR; 1073 } 1074 } while (lp != eot); 1075 modified = 1; 1076 SPL0(); 1077 } 1078 /* NOTREACHED */ 1079 } 1080 1081 1082 /* join_lines: replace a range of lines with the joined text of those lines */ 1083 int 1084 join_lines(long from, long to) 1085 { 1086 static char *buf = NULL; 1087 static int n; 1088 1089 char *s; 1090 int size = 0; 1091 line_t *bp, *ep; 1092 1093 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1094 bp = get_addressed_line_node(from); 1095 for (; bp != ep; bp = bp->q_forw) { 1096 if ((s = get_sbuf_line(bp)) == NULL) 1097 return ERR; 1098 REALLOC(buf, n, size + bp->len, ERR); 1099 memcpy(buf + size, s, bp->len); 1100 size += bp->len; 1101 } 1102 REALLOC(buf, n, size + 2, ERR); 1103 memcpy(buf + size, "\n", 2); 1104 if (delete_lines(from, to) < 0) 1105 return ERR; 1106 current_addr = from - 1; 1107 SPL1(); 1108 if (put_sbuf_line(buf) == NULL || 1109 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1110 SPL0(); 1111 return ERR; 1112 } 1113 modified = 1; 1114 SPL0(); 1115 return 0; 1116 } 1117 1118 1119 /* move_lines: move a range of lines */ 1120 int 1121 move_lines(long addr) 1122 { 1123 line_t *b1, *a1, *b2, *a2; 1124 long n = INC_MOD(second_addr, addr_last); 1125 long p = first_addr - 1; 1126 int done = (addr == first_addr - 1 || addr == second_addr); 1127 1128 SPL1(); 1129 if (done) { 1130 a2 = get_addressed_line_node(n); 1131 b2 = get_addressed_line_node(p); 1132 current_addr = second_addr; 1133 } else if (push_undo_stack(UMOV, p, n) == NULL || 1134 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1135 SPL0(); 1136 return ERR; 1137 } else { 1138 a1 = get_addressed_line_node(n); 1139 if (addr < first_addr) { 1140 b1 = get_addressed_line_node(p); 1141 b2 = get_addressed_line_node(addr); 1142 /* this get_addressed_line_node last! */ 1143 } else { 1144 b2 = get_addressed_line_node(addr); 1145 b1 = get_addressed_line_node(p); 1146 /* this get_addressed_line_node last! */ 1147 } 1148 a2 = b2->q_forw; 1149 REQUE(b2, b1->q_forw); 1150 REQUE(a1->q_back, a2); 1151 REQUE(b1, a1); 1152 current_addr = addr + ((addr < first_addr) ? 1153 second_addr - first_addr + 1 : 0); 1154 } 1155 if (isglobal) 1156 unset_active_nodes(b2->q_forw, a2); 1157 modified = 1; 1158 SPL0(); 1159 return 0; 1160 } 1161 1162 1163 /* copy_lines: copy a range of lines; return status */ 1164 int 1165 copy_lines(long addr) 1166 { 1167 line_t *lp, *np = get_addressed_line_node(first_addr); 1168 undo_t *up = NULL; 1169 long n = second_addr - first_addr + 1; 1170 long m = 0; 1171 1172 current_addr = addr; 1173 if (first_addr <= addr && addr < second_addr) { 1174 n = addr - first_addr + 1; 1175 m = second_addr - addr; 1176 } 1177 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1178 for (; n-- > 0; np = np->q_forw) { 1179 SPL1(); 1180 if ((lp = dup_line_node(np)) == NULL) { 1181 SPL0(); 1182 return ERR; 1183 } 1184 add_line_node(lp); 1185 if (up) 1186 up->t = lp; 1187 else if ((up = push_undo_stack(UADD, current_addr, 1188 current_addr)) == NULL) { 1189 SPL0(); 1190 return ERR; 1191 } 1192 modified = 1; 1193 SPL0(); 1194 } 1195 return 0; 1196 } 1197 1198 1199 /* delete_lines: delete a range of lines */ 1200 int 1201 delete_lines(long from, long to) 1202 { 1203 line_t *n, *p; 1204 1205 SPL1(); 1206 if (push_undo_stack(UDEL, from, to) == NULL) { 1207 SPL0(); 1208 return ERR; 1209 } 1210 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1211 p = get_addressed_line_node(from - 1); 1212 /* this get_addressed_line_node last! */ 1213 if (isglobal) 1214 unset_active_nodes(p->q_forw, n); 1215 REQUE(p, n); 1216 addr_last -= to - from + 1; 1217 current_addr = from - 1; 1218 modified = 1; 1219 SPL0(); 1220 return 0; 1221 } 1222 1223 1224 /* display_lines: print a range of lines to stdout */ 1225 int 1226 display_lines(long from, long to, int gflag) 1227 { 1228 line_t *bp; 1229 line_t *ep; 1230 char *s; 1231 1232 if (!from) { 1233 sprintf(errmsg, "invalid address"); 1234 return ERR; 1235 } 1236 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1237 bp = get_addressed_line_node(from); 1238 for (; bp != ep; bp = bp->q_forw) { 1239 if ((s = get_sbuf_line(bp)) == NULL) 1240 return ERR; 1241 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1242 return ERR; 1243 } 1244 return 0; 1245 } 1246 1247 1248 #define MAXMARK 26 /* max number of marks */ 1249 1250 line_t *mark[MAXMARK]; /* line markers */ 1251 int markno; /* line marker count */ 1252 1253 /* mark_line_node: set a line node mark */ 1254 int 1255 mark_line_node(line_t *lp, int n) 1256 { 1257 if (!islower(n)) { 1258 sprintf(errmsg, "invalid mark character"); 1259 return ERR; 1260 } else if (mark[n - 'a'] == NULL) 1261 markno++; 1262 mark[n - 'a'] = lp; 1263 return 0; 1264 } 1265 1266 1267 /* get_marked_node_addr: return address of a marked line */ 1268 long 1269 get_marked_node_addr(int n) 1270 { 1271 if (!islower(n)) { 1272 sprintf(errmsg, "invalid mark character"); 1273 return ERR; 1274 } 1275 return get_line_node_addr(mark[n - 'a']); 1276 } 1277 1278 1279 /* unmark_line_node: clear line node mark */ 1280 void 1281 unmark_line_node(line_t *lp) 1282 { 1283 int i; 1284 1285 for (i = 0; markno && i < MAXMARK; i++) 1286 if (mark[i] == lp) { 1287 mark[i] = NULL; 1288 markno--; 1289 } 1290 } 1291 1292 1293 /* dup_line_node: return a pointer to a copy of a line node */ 1294 line_t * 1295 dup_line_node(line_t *lp) 1296 { 1297 line_t *np; 1298 1299 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1300 fprintf(stderr, "%s\n", strerror(errno)); 1301 sprintf(errmsg, "out of memory"); 1302 return NULL; 1303 } 1304 np->seek = lp->seek; 1305 np->len = lp->len; 1306 return np; 1307 } 1308 1309 1310 /* has_trailing_escape: return the parity of escapes preceding a character 1311 in a string */ 1312 int 1313 has_trailing_escape(char *s, char *t) 1314 { 1315 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1316 } 1317 1318 1319 /* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1320 char * 1321 strip_escapes(const char *s) 1322 { 1323 static char *file = NULL; 1324 static int filesz = 0; 1325 1326 int i = 0; 1327 1328 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 1329 /* assert: no trailing escape */ 1330 while ((file[i++] = (*s == '\\') != '\0' ? *++s : *s)) 1331 s++; 1332 return file; 1333 } 1334 1335 1336 void 1337 signal_hup(int signo) 1338 { 1339 if (mutex) 1340 sigflags |= (1 << (signo - 1)); 1341 else handle_hup(signo); 1342 } 1343 1344 1345 void 1346 signal_int(int signo) 1347 { 1348 if (mutex) 1349 sigflags |= (1 << (signo - 1)); 1350 else handle_int(signo); 1351 } 1352 1353 1354 void 1355 handle_hup(int signo) 1356 { 1357 char *hup = NULL; /* hup filename */ 1358 char *s; 1359 int n; 1360 1361 if (!sigactive) 1362 quit(1); 1363 sigflags &= ~(1 << (signo - 1)); 1364 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1365 (s = getenv("HOME")) != NULL && 1366 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */ 1367 (hup = (char *) malloc(n + 10)) != NULL) { 1368 strcpy(hup, s); 1369 if (hup[n - 1] != '/') 1370 hup[n] = '/', hup[n+1] = '\0'; 1371 strcat(hup, "ed.hup"); 1372 write_file(hup, "w", 1, addr_last); 1373 } 1374 quit(2); 1375 } 1376 1377 1378 void 1379 handle_int(int signo) 1380 { 1381 if (!sigactive) 1382 quit(1); 1383 sigflags &= ~(1 << (signo - 1)); 1384 #ifdef _POSIX_SOURCE 1385 siglongjmp(env, -1); 1386 #else 1387 longjmp(env, -1); 1388 #endif 1389 } 1390 1391 1392 int cols = 72; /* wrap column */ 1393 1394 void 1395 handle_winch(int signo) 1396 { 1397 struct winsize ws; /* window size structure */ 1398 1399 sigflags &= ~(1 << (signo - 1)); 1400 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1401 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1402 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1403 } 1404 } 1405 1406 1407 /* is_legal_filename: return a legal filename */ 1408 int 1409 is_legal_filename(char *s) 1410 { 1411 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1412 sprintf(errmsg, "shell access restricted"); 1413 return 0; 1414 } 1415 return 1; 1416 } 1417