1 /* $NetBSD: main.c,v 1.10 1998/11/04 13:45:57 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 1.10 1998/11/04 13:45:57 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 scripted = 0; /* if set, suppress diagnostics */ 96 int sigflags = 0; /* if set, signals received while mutex set */ 97 int sigactive = 0; /* if set, signal handlers are enabled */ 98 99 char old_filename[MAXPATHLEN + 1] = ""; /* default filename */ 100 long current_addr; /* current address in editor buffer */ 101 long addr_last; /* last address in editor buffer */ 102 int lineno; /* script line number */ 103 char *prompt; /* command-line prompt */ 104 char *dps = "*"; /* default command-line prompt */ 105 106 char *usage = "usage: %s [-] [-sx] [-p string] [name]\n"; 107 108 extern char errmsg[]; 109 extern int optind; 110 extern char *optarg; 111 112 int main __P((int, char *[])); 113 114 /* ed: line editor */ 115 int 116 main(argc, argv) 117 int argc; 118 char *argv[]; 119 { 120 int c, n; 121 long status = 0; 122 #ifdef __GNUC__ 123 (void) &argc; 124 (void) &argv; 125 #endif 126 127 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 128 top: 129 while ((c = getopt(argc, argv, "p:sx")) != -1) 130 switch(c) { 131 case 'p': /* set prompt */ 132 prompt = optarg; 133 break; 134 case 's': /* run script */ 135 scripted = 1; 136 break; 137 case 'x': /* use crypt */ 138 #ifdef DES 139 des = get_keyword(); 140 #else 141 fprintf(stderr, "crypt unavailable\n?\n"); 142 #endif 143 break; 144 145 default: 146 fprintf(stderr, usage, argv[0]); 147 exit(1); 148 /* NOTREACHED */ 149 } 150 argv += optind; 151 argc -= optind; 152 if (argc && **argv == '-') { 153 scripted = 1; 154 if (argc > 1) { 155 optind = 1; 156 goto top; 157 } 158 argv++; 159 argc--; 160 } 161 /* assert: reliable signals! */ 162 #ifdef SIGWINCH 163 handle_winch(SIGWINCH); 164 if (isatty(0)) signal(SIGWINCH, handle_winch); 165 #endif 166 signal(SIGHUP, signal_hup); 167 signal(SIGQUIT, SIG_IGN); 168 signal(SIGINT, signal_int); 169 #ifdef _POSIX_SOURCE 170 if ((status = sigsetjmp(env, 1)) != 0) 171 #else 172 if ((status = setjmp(env)) != 0) 173 #endif 174 { 175 fputs("\n?\n", stderr); 176 sprintf(errmsg, "interrupt"); 177 } else { 178 init_buffers(); 179 sigactive = 1; /* enable signal handlers */ 180 if (argc && **argv && is_legal_filename(*argv)) { 181 if (read_file(*argv, 0) < 0 && !isatty(0)) 182 quit(2); 183 else if (**argv != '!') 184 strcpy(old_filename, *argv); 185 } else if (argc) { 186 fputs("?\n", stderr); 187 if (**argv == '\0') 188 sprintf(errmsg, "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 sprintf(errmsg, "warning: file modified"); 207 if (!isatty(0)) { 208 fprintf(stderr, garrulous ? 209 "script, line %d: %s\n" : 210 "", lineno, errmsg); 211 quit(2); 212 } 213 clearerr(stdin); 214 modified = 0; 215 status = EMOD; 216 continue; 217 } else 218 quit(0); 219 } else if (ibuf[n - 1] != '\n') { 220 /* discard line */ 221 sprintf(errmsg, "unexpected end-of-file"); 222 clearerr(stdin); 223 status = ERR; 224 continue; 225 } 226 isglobal = 0; 227 if ((status = extract_addr_range()) >= 0 && 228 (status = exec_command()) >= 0) 229 if (!status || (status && 230 (status = display_lines(current_addr, current_addr, 231 status))) >= 0) 232 continue; 233 switch (status) { 234 case EOF: 235 quit(0); 236 case EMOD: 237 modified = 0; 238 fputs("?\n", stderr); /* give warning */ 239 sprintf(errmsg, "warning: file modified"); 240 if (!isatty(0)) { 241 fprintf(stderr, garrulous ? 242 "script, line %d: %s\n" : 243 "", lineno, errmsg); 244 quit(2); 245 } 246 break; 247 case FATAL: 248 if (!isatty(0)) 249 fprintf(stderr, garrulous ? 250 "script, line %d: %s\n" : "", 251 lineno, errmsg); 252 else 253 fprintf(stderr, garrulous ? "%s\n" : "", 254 errmsg); 255 quit(3); 256 default: 257 fputs("?\n", stderr); 258 if (!isatty(0)) { 259 fprintf(stderr, garrulous ? 260 "script, line %d: %s\n" : "", 261 lineno, errmsg); 262 quit(2); 263 } 264 break; 265 } 266 } 267 /* NOTREACHED */ 268 } 269 270 long first_addr, second_addr, addr_cnt; 271 272 /* extract_addr_range: get line addresses from the command buffer until an 273 illegal address is seen; return status */ 274 int 275 extract_addr_range() 276 { 277 long addr; 278 279 addr_cnt = 0; 280 first_addr = second_addr = current_addr; 281 while ((addr = next_addr()) >= 0) { 282 addr_cnt++; 283 first_addr = second_addr; 284 second_addr = addr; 285 if (*ibufp != ',' && *ibufp != ';') 286 break; 287 else if (*ibufp++ == ';') 288 current_addr = addr; 289 } 290 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 291 first_addr = second_addr; 292 return (addr == ERR) ? ERR : 0; 293 } 294 295 296 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') \ 297 ibufp++ 298 299 #define MUST_BE_FIRST() \ 300 if (!first) { sprintf(errmsg, "invalid address"); return ERR; } 301 302 /* next_addr: return the next line address in the command buffer */ 303 long 304 next_addr() 305 { 306 char *hd; 307 long addr = current_addr; 308 long n; 309 int first = 1; 310 int c; 311 312 SKIP_BLANKS(); 313 for (hd = ibufp;; first = 0) 314 switch (c = *ibufp) { 315 case '+': 316 case '\t': 317 case ' ': 318 case '-': 319 case '^': 320 ibufp++; 321 SKIP_BLANKS(); 322 if (isdigit((unsigned char)*ibufp)) { 323 STRTOL(n, ibufp); 324 addr += (c == '-' || c == '^') ? -n : n; 325 } else if (!isspace(c)) 326 addr += (c == '-' || c == '^') ? -1 : 1; 327 break; 328 case '0': case '1': case '2': 329 case '3': case '4': case '5': 330 case '6': case '7': case '8': case '9': 331 MUST_BE_FIRST(); 332 STRTOL(addr, ibufp); 333 break; 334 case '.': 335 case '$': 336 MUST_BE_FIRST(); 337 ibufp++; 338 addr = (c == '.') ? current_addr : addr_last; 339 break; 340 case '/': 341 case '?': 342 MUST_BE_FIRST(); 343 if ((addr = get_matching_node_addr( 344 get_compiled_pattern(), c == '/')) < 0) 345 return ERR; 346 else if (c == *ibufp) 347 ibufp++; 348 break; 349 case '\'': 350 MUST_BE_FIRST(); 351 ibufp++; 352 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 353 return ERR; 354 break; 355 case '%': 356 case ',': 357 case ';': 358 if (first) { 359 ibufp++; 360 addr_cnt++; 361 second_addr = (c == ';') ? current_addr : 1; 362 addr = addr_last; 363 break; 364 } 365 /* FALL THROUGH */ 366 default: 367 if (ibufp == hd) 368 return EOF; 369 else if (addr < 0 || addr_last < addr) { 370 sprintf(errmsg, "invalid address"); 371 return ERR; 372 } else 373 return addr; 374 } 375 /* NOTREACHED */ 376 } 377 378 379 #ifdef BACKWARDS 380 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 381 #define GET_THIRD_ADDR(addr) \ 382 { \ 383 long ol1, ol2; \ 384 \ 385 ol1 = first_addr, ol2 = second_addr; \ 386 if (extract_addr_range() < 0) \ 387 return ERR; \ 388 else if (addr_cnt == 0) { \ 389 sprintf(errmsg, "destination expected"); \ 390 return ERR; \ 391 } else if (second_addr < 0 || addr_last < second_addr) { \ 392 sprintf(errmsg, "invalid address"); \ 393 return ERR; \ 394 } \ 395 addr = second_addr; \ 396 first_addr = ol1, second_addr = ol2; \ 397 } 398 #else /* BACKWARDS */ 399 /* GET_THIRD_ADDR: get a legal address from the command buffer */ 400 #define GET_THIRD_ADDR(addr) \ 401 { \ 402 long ol1, ol2; \ 403 \ 404 ol1 = first_addr, ol2 = second_addr; \ 405 if (extract_addr_range() < 0) \ 406 return ERR; \ 407 if (second_addr < 0 || addr_last < second_addr) { \ 408 sprintf(errmsg, "invalid address"); \ 409 return ERR; \ 410 } \ 411 addr = second_addr; \ 412 first_addr = ol1, second_addr = ol2; \ 413 } 414 #endif 415 416 417 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 418 #define GET_COMMAND_SUFFIX() { \ 419 int done = 0; \ 420 do { \ 421 switch(*ibufp) { \ 422 case 'p': \ 423 gflag |= GPR, ibufp++; \ 424 break; \ 425 case 'l': \ 426 gflag |= GLS, ibufp++; \ 427 break; \ 428 case 'n': \ 429 gflag |= GNP, ibufp++; \ 430 break; \ 431 default: \ 432 done++; \ 433 } \ 434 } while (!done); \ 435 if (*ibufp++ != '\n') { \ 436 sprintf(errmsg, "invalid command suffix"); \ 437 return ERR; \ 438 } \ 439 } 440 441 442 /* sflags */ 443 #define SGG 001 /* complement previous global substitute suffix */ 444 #define SGP 002 /* complement previous print suffix */ 445 #define SGR 004 /* use last regex instead of last pat */ 446 #define SGF 010 /* repeat last substitution */ 447 448 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 449 450 long rows = 22; /* scroll length: ws_row - 2 */ 451 452 /* exec_command: execute the next command in command buffer; return print 453 request, if any */ 454 int 455 exec_command() 456 { 457 extern long u_current_addr; 458 extern long u_addr_last; 459 460 static pattern_t *pat = NULL; 461 static int sgflag = 0; 462 static long sgnum = 0; 463 464 pattern_t *tpat; 465 char *fnp; 466 int gflag = 0; 467 int sflags = 0; 468 long addr = 0; 469 int n = 0; 470 int c; 471 472 SKIP_BLANKS(); 473 switch(c = *ibufp++) { 474 case 'a': 475 GET_COMMAND_SUFFIX(); 476 if (!isglobal) clear_undo_stack(); 477 if (append_lines(second_addr) < 0) 478 return ERR; 479 break; 480 case 'c': 481 if (check_addr_range(current_addr, current_addr) < 0) 482 return ERR; 483 GET_COMMAND_SUFFIX(); 484 if (!isglobal) clear_undo_stack(); 485 if (delete_lines(first_addr, second_addr) < 0 || 486 append_lines(current_addr) < 0) 487 return ERR; 488 break; 489 case 'd': 490 if (check_addr_range(current_addr, current_addr) < 0) 491 return ERR; 492 GET_COMMAND_SUFFIX(); 493 if (!isglobal) clear_undo_stack(); 494 if (delete_lines(first_addr, second_addr) < 0) 495 return ERR; 496 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 497 current_addr = addr; 498 break; 499 case 'e': 500 if (modified && !scripted) 501 return EMOD; 502 /* fall through */ 503 case 'E': 504 if (addr_cnt > 0) { 505 sprintf(errmsg, "unexpected address"); 506 return ERR; 507 } else if (!isspace((unsigned char)*ibufp)) { 508 sprintf(errmsg, "unexpected command suffix"); 509 return ERR; 510 } else if ((fnp = get_filename()) == NULL) 511 return ERR; 512 GET_COMMAND_SUFFIX(); 513 if (delete_lines(1, addr_last) < 0) 514 return ERR; 515 clear_undo_stack(); 516 if (close_sbuf() < 0) 517 return ERR; 518 else if (open_sbuf() < 0) 519 return FATAL; 520 if (*fnp && *fnp != '!') strcpy(old_filename, fnp); 521 #ifdef BACKWARDS 522 if (*fnp == '\0' && *old_filename == '\0') { 523 sprintf(errmsg, "no current filename"); 524 return ERR; 525 } 526 #endif 527 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 528 return ERR; 529 clear_undo_stack(); 530 modified = 0; 531 u_current_addr = u_addr_last = -1; 532 break; 533 case 'f': 534 if (addr_cnt > 0) { 535 sprintf(errmsg, "unexpected address"); 536 return ERR; 537 } else if (!isspace((unsigned char)*ibufp)) { 538 sprintf(errmsg, "unexpected command suffix"); 539 return ERR; 540 } else if ((fnp = get_filename()) == NULL) 541 return ERR; 542 else if (*fnp == '!') { 543 sprintf(errmsg, "invalid redirection"); 544 return ERR; 545 } 546 GET_COMMAND_SUFFIX(); 547 if (*fnp) strcpy(old_filename, fnp); 548 printf("%s\n", strip_escapes(old_filename)); 549 break; 550 case 'g': 551 case 'v': 552 case 'G': 553 case 'V': 554 if (isglobal) { 555 sprintf(errmsg, "cannot nest global commands"); 556 return ERR; 557 } else if (check_addr_range(1, addr_last) < 0) 558 return ERR; 559 else if (build_active_list(c == 'g' || c == 'G') < 0) 560 return ERR; 561 else if ((n = (c == 'G' || c == 'V')) != 0) 562 GET_COMMAND_SUFFIX(); 563 isglobal++; 564 if (exec_global(n, gflag) < 0) 565 return ERR; 566 break; 567 case 'h': 568 if (addr_cnt > 0) { 569 sprintf(errmsg, "unexpected address"); 570 return ERR; 571 } 572 GET_COMMAND_SUFFIX(); 573 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 574 break; 575 case 'H': 576 if (addr_cnt > 0) { 577 sprintf(errmsg, "unexpected address"); 578 return ERR; 579 } 580 GET_COMMAND_SUFFIX(); 581 if ((garrulous = 1 - garrulous) && *errmsg) 582 fprintf(stderr, "%s\n", errmsg); 583 break; 584 case 'i': 585 if (second_addr == 0) { 586 sprintf(errmsg, "invalid address"); 587 return ERR; 588 } 589 GET_COMMAND_SUFFIX(); 590 if (!isglobal) clear_undo_stack(); 591 if (append_lines(second_addr - 1) < 0) 592 return ERR; 593 break; 594 case 'j': 595 if (check_addr_range(current_addr, current_addr + 1) < 0) 596 return ERR; 597 GET_COMMAND_SUFFIX(); 598 if (!isglobal) clear_undo_stack(); 599 if (first_addr != second_addr && 600 join_lines(first_addr, second_addr) < 0) 601 return ERR; 602 break; 603 case 'k': 604 c = *ibufp++; 605 if (second_addr == 0) { 606 sprintf(errmsg, "invalid address"); 607 return ERR; 608 } 609 GET_COMMAND_SUFFIX(); 610 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 611 return ERR; 612 break; 613 case 'l': 614 if (check_addr_range(current_addr, current_addr) < 0) 615 return ERR; 616 GET_COMMAND_SUFFIX(); 617 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 618 return ERR; 619 gflag = 0; 620 break; 621 case 'm': 622 if (check_addr_range(current_addr, current_addr) < 0) 623 return ERR; 624 GET_THIRD_ADDR(addr); 625 if (first_addr <= addr && addr < second_addr) { 626 sprintf(errmsg, "invalid destination"); 627 return ERR; 628 } 629 GET_COMMAND_SUFFIX(); 630 if (!isglobal) clear_undo_stack(); 631 if (move_lines(addr) < 0) 632 return ERR; 633 break; 634 case 'n': 635 if (check_addr_range(current_addr, current_addr) < 0) 636 return ERR; 637 GET_COMMAND_SUFFIX(); 638 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 639 return ERR; 640 gflag = 0; 641 break; 642 case 'p': 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 | GPR) < 0) 647 return ERR; 648 gflag = 0; 649 break; 650 case 'P': 651 if (addr_cnt > 0) { 652 sprintf(errmsg, "unexpected address"); 653 return ERR; 654 } 655 GET_COMMAND_SUFFIX(); 656 prompt = prompt ? NULL : optarg ? optarg : dps; 657 break; 658 case 'q': 659 case 'Q': 660 if (addr_cnt > 0) { 661 sprintf(errmsg, "unexpected address"); 662 return ERR; 663 } 664 GET_COMMAND_SUFFIX(); 665 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 666 break; 667 case 'r': 668 if (!isspace((unsigned char)*ibufp)) { 669 sprintf(errmsg, "unexpected command suffix"); 670 return ERR; 671 } else if (addr_cnt == 0) 672 second_addr = addr_last; 673 if ((fnp = get_filename()) == NULL) 674 return ERR; 675 GET_COMMAND_SUFFIX(); 676 if (!isglobal) clear_undo_stack(); 677 if (*old_filename == '\0' && *fnp != '!') 678 strcpy(old_filename, fnp); 679 #ifdef BACKWARDS 680 if (*fnp == '\0' && *old_filename == '\0') { 681 sprintf(errmsg, "no current filename"); 682 return ERR; 683 } 684 #endif 685 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 686 return ERR; 687 else if (addr && addr != addr_last) 688 modified = 1; 689 break; 690 case 's': 691 do { 692 switch(*ibufp) { 693 case '\n': 694 sflags |=SGF; 695 break; 696 case 'g': 697 sflags |= SGG; 698 ibufp++; 699 break; 700 case 'p': 701 sflags |= SGP; 702 ibufp++; 703 break; 704 case 'r': 705 sflags |= SGR; 706 ibufp++; 707 break; 708 case '0': case '1': case '2': case '3': case '4': 709 case '5': case '6': case '7': case '8': case '9': 710 STRTOL(sgnum, ibufp); 711 sflags |= SGF; 712 sgflag &= ~GSG; /* override GSG */ 713 break; 714 default: 715 if (sflags) { 716 sprintf(errmsg, "invalid command suffix"); 717 return ERR; 718 } 719 } 720 } while (sflags && *ibufp != '\n'); 721 if (sflags && !pat) { 722 sprintf(errmsg, "no previous substitution"); 723 return ERR; 724 } else if (sflags & SGG) 725 sgnum = 0; /* override numeric arg */ 726 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 727 sprintf(errmsg, "invalid pattern delimiter"); 728 return ERR; 729 } 730 tpat = pat; 731 SPL1(); 732 if ((!sflags || (sflags & SGR)) && 733 (tpat = get_compiled_pattern()) == NULL) { 734 SPL0(); 735 return ERR; 736 } else if (tpat != pat) { 737 if (pat) { 738 regfree(pat); 739 free(pat); 740 } 741 pat = tpat; 742 patlock = 1; /* reserve pattern */ 743 } 744 SPL0(); 745 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 746 return ERR; 747 else if (isglobal) 748 sgflag |= GLB; 749 else 750 sgflag &= ~GLB; 751 if (sflags & SGG) 752 sgflag ^= GSG; 753 if (sflags & SGP) 754 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 755 do { 756 switch(*ibufp) { 757 case 'p': 758 sgflag |= GPR, ibufp++; 759 break; 760 case 'l': 761 sgflag |= GLS, ibufp++; 762 break; 763 case 'n': 764 sgflag |= GNP, ibufp++; 765 break; 766 default: 767 n++; 768 } 769 } while (!n); 770 if (check_addr_range(current_addr, current_addr) < 0) 771 return ERR; 772 GET_COMMAND_SUFFIX(); 773 if (!isglobal) clear_undo_stack(); 774 if (search_and_replace(pat, sgflag, sgnum) < 0) 775 return ERR; 776 break; 777 case 't': 778 if (check_addr_range(current_addr, current_addr) < 0) 779 return ERR; 780 GET_THIRD_ADDR(addr); 781 GET_COMMAND_SUFFIX(); 782 if (!isglobal) clear_undo_stack(); 783 if (copy_lines(addr) < 0) 784 return ERR; 785 break; 786 case 'u': 787 if (addr_cnt > 0) { 788 sprintf(errmsg, "unexpected address"); 789 return ERR; 790 } 791 GET_COMMAND_SUFFIX(); 792 if (pop_undo_stack() < 0) 793 return ERR; 794 break; 795 case 'w': 796 case 'W': 797 if ((n = *ibufp) == 'q' || n == 'Q') { 798 gflag = EOF; 799 ibufp++; 800 } 801 if (!isspace((unsigned char)*ibufp)) { 802 sprintf(errmsg, "unexpected command suffix"); 803 return ERR; 804 } else if ((fnp = get_filename()) == NULL) 805 return ERR; 806 if (addr_cnt == 0 && !addr_last) 807 first_addr = second_addr = 0; 808 else if (check_addr_range(1, addr_last) < 0) 809 return ERR; 810 GET_COMMAND_SUFFIX(); 811 if (*old_filename == '\0' && *fnp != '!') 812 strcpy(old_filename, fnp); 813 #ifdef BACKWARDS 814 if (*fnp == '\0' && *old_filename == '\0') { 815 sprintf(errmsg, "no current filename"); 816 return ERR; 817 } 818 #endif 819 if ((addr = write_file(*fnp ? fnp : old_filename, 820 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 821 return ERR; 822 else if (addr == addr_last) 823 modified = 0; 824 else if (modified && !scripted && n == 'q') 825 gflag = EMOD; 826 break; 827 case 'x': 828 if (addr_cnt > 0) { 829 sprintf(errmsg, "unexpected address"); 830 return ERR; 831 } 832 GET_COMMAND_SUFFIX(); 833 #ifdef DES 834 des = get_keyword(); 835 #else 836 sprintf(errmsg, "crypt unavailable"); 837 return ERR; 838 #endif 839 break; 840 case 'z': 841 #ifdef BACKWARDS 842 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 843 #else 844 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 845 #endif 846 return ERR; 847 else if ('0' < *ibufp && *ibufp <= '9') 848 STRTOL(rows, ibufp); 849 GET_COMMAND_SUFFIX(); 850 if (display_lines(second_addr, min(addr_last, 851 second_addr + rows), gflag) < 0) 852 return ERR; 853 gflag = 0; 854 break; 855 case '=': 856 GET_COMMAND_SUFFIX(); 857 printf("%ld\n", addr_cnt ? second_addr : addr_last); 858 break; 859 case '!': 860 if (addr_cnt > 0) { 861 sprintf(errmsg, "unexpected address"); 862 return ERR; 863 } else if ((sflags = get_shell_command()) < 0) 864 return ERR; 865 GET_COMMAND_SUFFIX(); 866 if (sflags) printf("%s\n", shcmd + 1); 867 system(shcmd + 1); 868 if (!scripted) printf("!\n"); 869 break; 870 case '\n': 871 #ifdef BACKWARDS 872 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 873 #else 874 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 875 #endif 876 || display_lines(second_addr, second_addr, 0) < 0) 877 return ERR; 878 break; 879 default: 880 sprintf(errmsg, "unknown command"); 881 return ERR; 882 } 883 return gflag; 884 } 885 886 887 /* check_addr_range: return status of address range check */ 888 int 889 check_addr_range(n, m) 890 long n, m; 891 { 892 if (addr_cnt == 0) { 893 first_addr = n; 894 second_addr = m; 895 } 896 if (first_addr > second_addr || 1 > first_addr || 897 second_addr > addr_last) { 898 sprintf(errmsg, "invalid address"); 899 return ERR; 900 } 901 return 0; 902 } 903 904 905 /* get_matching_node_addr: return the address of the next line matching a 906 pattern in a given direction. wrap around begin/end of editor buffer if 907 necessary */ 908 long 909 get_matching_node_addr(pat, dir) 910 pattern_t *pat; 911 int dir; 912 { 913 char *s; 914 long n = current_addr; 915 line_t *lp; 916 917 if (!pat) return ERR; 918 do { 919 if ((n = dir ? INC_MOD(n, addr_last) : 920 DEC_MOD(n, addr_last)) != 0) { 921 lp = get_addressed_line_node(n); 922 if ((s = get_sbuf_line(lp)) == NULL) 923 return ERR; 924 if (isbinary) 925 NUL_TO_NEWLINE(s, lp->len); 926 if (!regexec(pat, s, 0, NULL, 0)) 927 return n; 928 } 929 } while (n != current_addr); 930 sprintf(errmsg, "no match"); 931 return ERR; 932 } 933 934 935 /* get_filename: return pointer to copy of filename in the command buffer */ 936 char * 937 get_filename() 938 { 939 static char *file = NULL; 940 static int filesz = 0; 941 942 int n; 943 944 if (*ibufp != '\n') { 945 SKIP_BLANKS(); 946 if (*ibufp == '\n') { 947 sprintf(errmsg, "invalid filename"); 948 return NULL; 949 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 950 return NULL; 951 else if (*ibufp == '!') { 952 ibufp++; 953 if ((n = get_shell_command()) < 0) 954 return NULL; 955 if (n) printf("%s\n", shcmd + 1); 956 return shcmd; 957 } else if (n - 1 > MAXPATHLEN) { 958 sprintf(errmsg, "filename too long"); 959 return NULL; 960 } 961 } 962 #ifndef BACKWARDS 963 else if (*old_filename == '\0') { 964 sprintf(errmsg, "no current filename"); 965 return NULL; 966 } 967 #endif 968 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 969 for (n = 0; *ibufp != '\n';) 970 file[n++] = *ibufp++; 971 file[n] = '\0'; 972 return is_legal_filename(file) ? file : NULL; 973 } 974 975 976 /* get_shell_command: read a shell command from stdin; return substitution 977 status */ 978 int 979 get_shell_command() 980 { 981 static char *buf = NULL; 982 static int n = 0; 983 984 char *s; /* substitution char pointer */ 985 int i = 0; 986 int j = 0; 987 988 if (red) { 989 sprintf(errmsg, "shell access restricted"); 990 return ERR; 991 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 992 return ERR; 993 REALLOC(buf, n, j + 1, ERR); 994 buf[i++] = '!'; /* prefix command w/ bang */ 995 while (*ibufp != '\n') 996 switch (*ibufp) { 997 default: 998 REALLOC(buf, n, i + 2, ERR); 999 buf[i++] = *ibufp; 1000 if (*ibufp++ == '\\') 1001 buf[i++] = *ibufp++; 1002 break; 1003 case '!': 1004 if (s != ibufp) { 1005 REALLOC(buf, n, i + 1, ERR); 1006 buf[i++] = *ibufp++; 1007 } 1008 #ifdef BACKWARDS 1009 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1010 #else 1011 else if (shcmd == NULL) 1012 #endif 1013 { 1014 sprintf(errmsg, "no previous command"); 1015 return ERR; 1016 } else { 1017 REALLOC(buf, n, i + shcmdi, ERR); 1018 for (s = shcmd + 1; s < shcmd + shcmdi;) 1019 buf[i++] = *s++; 1020 s = ibufp++; 1021 } 1022 break; 1023 case '%': 1024 if (*old_filename == '\0') { 1025 sprintf(errmsg, "no current filename"); 1026 return ERR; 1027 } 1028 j = strlen(s = strip_escapes(old_filename)); 1029 REALLOC(buf, n, i + j, ERR); 1030 while (j--) 1031 buf[i++] = *s++; 1032 s = ibufp++; 1033 break; 1034 } 1035 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1036 memcpy(shcmd, buf, i); 1037 shcmd[shcmdi = i] = '\0'; 1038 return *s == '!' || *s == '%'; 1039 } 1040 1041 1042 /* append_lines: insert text from stdin to after line n; stop when either a 1043 single period is read or EOF; return status */ 1044 int 1045 append_lines(n) 1046 long n; 1047 { 1048 int l; 1049 char *lp = ibuf; 1050 char *eot; 1051 undo_t *up = NULL; 1052 1053 for (current_addr = n;;) { 1054 if (!isglobal) { 1055 if ((l = get_tty_line()) < 0) 1056 return ERR; 1057 else if (l == 0 || ibuf[l - 1] != '\n') { 1058 clearerr(stdin); 1059 return l ? EOF : 0; 1060 } 1061 lp = ibuf; 1062 } else if (*(lp = ibufp) == '\0') 1063 return 0; 1064 else { 1065 while (*ibufp++ != '\n') 1066 ; 1067 l = ibufp - lp; 1068 } 1069 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1070 return 0; 1071 } 1072 eot = lp + l; 1073 SPL1(); 1074 do { 1075 if ((lp = put_sbuf_line(lp)) == NULL) { 1076 SPL0(); 1077 return ERR; 1078 } else if (up) 1079 up->t = get_addressed_line_node(current_addr); 1080 else if ((up = push_undo_stack(UADD, current_addr, 1081 current_addr)) == NULL) { 1082 SPL0(); 1083 return ERR; 1084 } 1085 } while (lp != eot); 1086 modified = 1; 1087 SPL0(); 1088 } 1089 /* NOTREACHED */ 1090 } 1091 1092 1093 /* join_lines: replace a range of lines with the joined text of those lines */ 1094 int 1095 join_lines(from, to) 1096 long from; 1097 long to; 1098 { 1099 static char *buf = NULL; 1100 static int n; 1101 1102 char *s; 1103 int size = 0; 1104 line_t *bp, *ep; 1105 1106 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1107 bp = get_addressed_line_node(from); 1108 for (; bp != ep; bp = bp->q_forw) { 1109 if ((s = get_sbuf_line(bp)) == NULL) 1110 return ERR; 1111 REALLOC(buf, n, size + bp->len, ERR); 1112 memcpy(buf + size, s, bp->len); 1113 size += bp->len; 1114 } 1115 REALLOC(buf, n, size + 2, ERR); 1116 memcpy(buf + size, "\n", 2); 1117 if (delete_lines(from, to) < 0) 1118 return ERR; 1119 current_addr = from - 1; 1120 SPL1(); 1121 if (put_sbuf_line(buf) == NULL || 1122 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1123 SPL0(); 1124 return ERR; 1125 } 1126 modified = 1; 1127 SPL0(); 1128 return 0; 1129 } 1130 1131 1132 /* move_lines: move a range of lines */ 1133 int 1134 move_lines(addr) 1135 long addr; 1136 { 1137 line_t *b1, *a1, *b2, *a2; 1138 long n = INC_MOD(second_addr, addr_last); 1139 long p = first_addr - 1; 1140 int done = (addr == first_addr - 1 || addr == second_addr); 1141 1142 SPL1(); 1143 if (done) { 1144 a2 = get_addressed_line_node(n); 1145 b2 = get_addressed_line_node(p); 1146 current_addr = second_addr; 1147 } else if (push_undo_stack(UMOV, p, n) == NULL || 1148 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1149 SPL0(); 1150 return ERR; 1151 } else { 1152 a1 = get_addressed_line_node(n); 1153 if (addr < first_addr) { 1154 b1 = get_addressed_line_node(p); 1155 b2 = get_addressed_line_node(addr); 1156 /* this get_addressed_line_node last! */ 1157 } else { 1158 b2 = get_addressed_line_node(addr); 1159 b1 = get_addressed_line_node(p); 1160 /* this get_addressed_line_node last! */ 1161 } 1162 a2 = b2->q_forw; 1163 REQUE(b2, b1->q_forw); 1164 REQUE(a1->q_back, a2); 1165 REQUE(b1, a1); 1166 current_addr = addr + ((addr < first_addr) ? 1167 second_addr - first_addr + 1 : 0); 1168 } 1169 if (isglobal) 1170 unset_active_nodes(b2->q_forw, a2); 1171 modified = 1; 1172 SPL0(); 1173 return 0; 1174 } 1175 1176 1177 /* copy_lines: copy a range of lines; return status */ 1178 int 1179 copy_lines(addr) 1180 long addr; 1181 { 1182 line_t *lp, *np = get_addressed_line_node(first_addr); 1183 undo_t *up = NULL; 1184 long n = second_addr - first_addr + 1; 1185 long m = 0; 1186 1187 current_addr = addr; 1188 if (first_addr <= addr && addr < second_addr) { 1189 n = addr - first_addr + 1; 1190 m = second_addr - addr; 1191 } 1192 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1193 for (; n-- > 0; np = np->q_forw) { 1194 SPL1(); 1195 if ((lp = dup_line_node(np)) == NULL) { 1196 SPL0(); 1197 return ERR; 1198 } 1199 add_line_node(lp); 1200 if (up) 1201 up->t = lp; 1202 else if ((up = push_undo_stack(UADD, current_addr, 1203 current_addr)) == NULL) { 1204 SPL0(); 1205 return ERR; 1206 } 1207 modified = 1; 1208 SPL0(); 1209 } 1210 return 0; 1211 } 1212 1213 1214 /* delete_lines: delete a range of lines */ 1215 int 1216 delete_lines(from, to) 1217 long from, 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(from, to, gflag) 1243 long from; 1244 long to; 1245 int gflag; 1246 { 1247 line_t *bp; 1248 line_t *ep; 1249 char *s; 1250 1251 if (!from) { 1252 sprintf(errmsg, "invalid address"); 1253 return ERR; 1254 } 1255 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1256 bp = get_addressed_line_node(from); 1257 for (; bp != ep; bp = bp->q_forw) { 1258 if ((s = get_sbuf_line(bp)) == NULL) 1259 return ERR; 1260 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1261 return ERR; 1262 } 1263 return 0; 1264 } 1265 1266 1267 #define MAXMARK 26 /* max number of marks */ 1268 1269 line_t *mark[MAXMARK]; /* line markers */ 1270 int markno; /* line marker count */ 1271 1272 /* mark_line_node: set a line node mark */ 1273 int 1274 mark_line_node(lp, n) 1275 line_t *lp; 1276 int n; 1277 { 1278 if (!islower(n)) { 1279 sprintf(errmsg, "invalid mark character"); 1280 return ERR; 1281 } else if (mark[n - 'a'] == NULL) 1282 markno++; 1283 mark[n - 'a'] = lp; 1284 return 0; 1285 } 1286 1287 1288 /* get_marked_node_addr: return address of a marked line */ 1289 long 1290 get_marked_node_addr(n) 1291 int n; 1292 { 1293 if (!islower(n)) { 1294 sprintf(errmsg, "invalid mark character"); 1295 return ERR; 1296 } 1297 return get_line_node_addr(mark[n - 'a']); 1298 } 1299 1300 1301 /* unmark_line_node: clear line node mark */ 1302 void 1303 unmark_line_node(lp) 1304 line_t *lp; 1305 { 1306 int i; 1307 1308 for (i = 0; markno && i < MAXMARK; i++) 1309 if (mark[i] == lp) { 1310 mark[i] = NULL; 1311 markno--; 1312 } 1313 } 1314 1315 1316 /* dup_line_node: return a pointer to a copy of a line node */ 1317 line_t * 1318 dup_line_node(lp) 1319 line_t *lp; 1320 { 1321 line_t *np; 1322 1323 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1324 fprintf(stderr, "%s\n", strerror(errno)); 1325 sprintf(errmsg, "out of memory"); 1326 return NULL; 1327 } 1328 np->seek = lp->seek; 1329 np->len = lp->len; 1330 return np; 1331 } 1332 1333 1334 /* has_trailing_escape: return the parity of escapes preceding a character 1335 in a string */ 1336 int 1337 has_trailing_escape(s, t) 1338 char *s; 1339 char *t; 1340 { 1341 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1342 } 1343 1344 1345 /* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1346 char * 1347 strip_escapes(s) 1348 char *s; 1349 { 1350 static char *file = NULL; 1351 static int filesz = 0; 1352 1353 int i = 0; 1354 1355 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 1356 /* assert: no trailing escape */ 1357 while ((file[i++] = (*s == '\\') != '\0' ? *++s : *s)) 1358 s++; 1359 return file; 1360 } 1361 1362 1363 void 1364 signal_hup(signo) 1365 int signo; 1366 { 1367 if (mutex) 1368 sigflags |= (1 << (signo - 1)); 1369 else handle_hup(signo); 1370 } 1371 1372 1373 void 1374 signal_int(signo) 1375 int signo; 1376 { 1377 if (mutex) 1378 sigflags |= (1 << (signo - 1)); 1379 else handle_int(signo); 1380 } 1381 1382 1383 void 1384 handle_hup(signo) 1385 int signo; 1386 { 1387 char *hup = NULL; /* hup filename */ 1388 char *s; 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 <= MAXPATHLEN && /* "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 struct winsize ws; /* window size structure */ 1430 1431 sigflags &= ~(1 << (signo - 1)); 1432 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1433 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1434 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1435 } 1436 } 1437 1438 1439 /* is_legal_filename: return a legal filename */ 1440 int 1441 is_legal_filename(s) 1442 char *s; 1443 { 1444 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1445 sprintf(errmsg, "shell access restricted"); 1446 return 0; 1447 } 1448 return 1; 1449 } 1450