1 /* $NetBSD: main.c,v 1.13 2002/01/23 19:07:33 atatat 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 1.13 2002/01/23 19:07:33 atatat 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 char *prompt; /* command-line prompt */ 105 char *dps = "*"; /* default command-line prompt */ 106 107 char *usage = "usage: %s [-] [-sxE] [-p string] [name]\n"; 108 109 int main __P((int, char *[])); 110 111 /* ed: line editor */ 112 int 113 main(argc, argv) 114 int argc; 115 char *argv[]; 116 { 117 int c, n; 118 long status = 0; 119 #ifdef __GNUC__ 120 (void) &argc; 121 (void) &argv; 122 #endif 123 124 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 125 top: 126 while ((c = getopt(argc, argv, "p:sxE")) != -1) 127 switch(c) { 128 case 'p': /* set prompt */ 129 prompt = optarg; 130 break; 131 case 's': /* run script */ 132 scripted = 1; 133 break; 134 case 'x': /* use crypt */ 135 #ifdef DES 136 des = get_keyword(); 137 #else 138 fprintf(stderr, "crypt unavailable\n?\n"); 139 #endif 140 break; 141 142 case 'E': 143 ere = REG_EXTENDED; 144 break; 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 static pattern_t *pat = NULL; 458 static int sgflag = 0; 459 static long sgnum = 0; 460 461 pattern_t *tpat; 462 char *fnp; 463 int gflag = 0; 464 int sflags = 0; 465 long addr = 0; 466 int n = 0; 467 int c; 468 469 SKIP_BLANKS(); 470 switch(c = *ibufp++) { 471 case 'a': 472 GET_COMMAND_SUFFIX(); 473 if (!isglobal) clear_undo_stack(); 474 if (append_lines(second_addr) < 0) 475 return ERR; 476 break; 477 case 'c': 478 if (check_addr_range(current_addr, current_addr) < 0) 479 return ERR; 480 GET_COMMAND_SUFFIX(); 481 if (!isglobal) clear_undo_stack(); 482 if (delete_lines(first_addr, second_addr) < 0 || 483 append_lines(current_addr) < 0) 484 return ERR; 485 break; 486 case 'd': 487 if (check_addr_range(current_addr, current_addr) < 0) 488 return ERR; 489 GET_COMMAND_SUFFIX(); 490 if (!isglobal) clear_undo_stack(); 491 if (delete_lines(first_addr, second_addr) < 0) 492 return ERR; 493 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 494 current_addr = addr; 495 break; 496 case 'e': 497 if (modified && !scripted) 498 return EMOD; 499 /* fall through */ 500 case 'E': 501 if (addr_cnt > 0) { 502 sprintf(errmsg, "unexpected address"); 503 return ERR; 504 } else if (!isspace((unsigned char)*ibufp)) { 505 sprintf(errmsg, "unexpected command suffix"); 506 return ERR; 507 } else if ((fnp = get_filename()) == NULL) 508 return ERR; 509 GET_COMMAND_SUFFIX(); 510 if (delete_lines(1, addr_last) < 0) 511 return ERR; 512 clear_undo_stack(); 513 if (close_sbuf() < 0) 514 return ERR; 515 else if (open_sbuf() < 0) 516 return FATAL; 517 if (*fnp && *fnp != '!') strcpy(old_filename, fnp); 518 #ifdef BACKWARDS 519 if (*fnp == '\0' && *old_filename == '\0') { 520 sprintf(errmsg, "no current filename"); 521 return ERR; 522 } 523 #endif 524 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 525 return ERR; 526 clear_undo_stack(); 527 modified = 0; 528 u_current_addr = u_addr_last = -1; 529 break; 530 case 'f': 531 if (addr_cnt > 0) { 532 sprintf(errmsg, "unexpected address"); 533 return ERR; 534 } else if (!isspace((unsigned char)*ibufp)) { 535 sprintf(errmsg, "unexpected command suffix"); 536 return ERR; 537 } else if ((fnp = get_filename()) == NULL) 538 return ERR; 539 else if (*fnp == '!') { 540 sprintf(errmsg, "invalid redirection"); 541 return ERR; 542 } 543 GET_COMMAND_SUFFIX(); 544 if (*fnp) strcpy(old_filename, fnp); 545 printf("%s\n", strip_escapes(old_filename)); 546 break; 547 case 'g': 548 case 'v': 549 case 'G': 550 case 'V': 551 if (isglobal) { 552 sprintf(errmsg, "cannot nest global commands"); 553 return ERR; 554 } else if (check_addr_range(1, addr_last) < 0) 555 return ERR; 556 else if (build_active_list(c == 'g' || c == 'G') < 0) 557 return ERR; 558 else if ((n = (c == 'G' || c == 'V')) != 0) 559 GET_COMMAND_SUFFIX(); 560 isglobal++; 561 if (exec_global(n, gflag) < 0) 562 return ERR; 563 break; 564 case 'h': 565 if (addr_cnt > 0) { 566 sprintf(errmsg, "unexpected address"); 567 return ERR; 568 } 569 GET_COMMAND_SUFFIX(); 570 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 571 break; 572 case 'H': 573 if (addr_cnt > 0) { 574 sprintf(errmsg, "unexpected address"); 575 return ERR; 576 } 577 GET_COMMAND_SUFFIX(); 578 if ((garrulous = 1 - garrulous) && *errmsg) 579 fprintf(stderr, "%s\n", errmsg); 580 break; 581 case 'i': 582 if (second_addr == 0) { 583 sprintf(errmsg, "invalid address"); 584 return ERR; 585 } 586 GET_COMMAND_SUFFIX(); 587 if (!isglobal) clear_undo_stack(); 588 if (append_lines(second_addr - 1) < 0) 589 return ERR; 590 break; 591 case 'j': 592 if (check_addr_range(current_addr, current_addr + 1) < 0) 593 return ERR; 594 GET_COMMAND_SUFFIX(); 595 if (!isglobal) clear_undo_stack(); 596 if (first_addr != second_addr && 597 join_lines(first_addr, second_addr) < 0) 598 return ERR; 599 break; 600 case 'k': 601 c = *ibufp++; 602 if (second_addr == 0) { 603 sprintf(errmsg, "invalid address"); 604 return ERR; 605 } 606 GET_COMMAND_SUFFIX(); 607 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 608 return ERR; 609 break; 610 case 'l': 611 if (check_addr_range(current_addr, current_addr) < 0) 612 return ERR; 613 GET_COMMAND_SUFFIX(); 614 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 615 return ERR; 616 gflag = 0; 617 break; 618 case 'm': 619 if (check_addr_range(current_addr, current_addr) < 0) 620 return ERR; 621 GET_THIRD_ADDR(addr); 622 if (first_addr <= addr && addr < second_addr) { 623 sprintf(errmsg, "invalid destination"); 624 return ERR; 625 } 626 GET_COMMAND_SUFFIX(); 627 if (!isglobal) clear_undo_stack(); 628 if (move_lines(addr) < 0) 629 return ERR; 630 break; 631 case 'n': 632 if (check_addr_range(current_addr, current_addr) < 0) 633 return ERR; 634 GET_COMMAND_SUFFIX(); 635 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 636 return ERR; 637 gflag = 0; 638 break; 639 case 'p': 640 if (check_addr_range(current_addr, current_addr) < 0) 641 return ERR; 642 GET_COMMAND_SUFFIX(); 643 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 644 return ERR; 645 gflag = 0; 646 break; 647 case 'P': 648 if (addr_cnt > 0) { 649 sprintf(errmsg, "unexpected address"); 650 return ERR; 651 } 652 GET_COMMAND_SUFFIX(); 653 prompt = prompt ? NULL : optarg ? optarg : dps; 654 break; 655 case 'q': 656 case 'Q': 657 if (addr_cnt > 0) { 658 sprintf(errmsg, "unexpected address"); 659 return ERR; 660 } 661 GET_COMMAND_SUFFIX(); 662 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 663 break; 664 case 'r': 665 if (!isspace((unsigned char)*ibufp)) { 666 sprintf(errmsg, "unexpected command suffix"); 667 return ERR; 668 } else if (addr_cnt == 0) 669 second_addr = addr_last; 670 if ((fnp = get_filename()) == NULL) 671 return ERR; 672 GET_COMMAND_SUFFIX(); 673 if (!isglobal) clear_undo_stack(); 674 if (*old_filename == '\0' && *fnp != '!') 675 strcpy(old_filename, fnp); 676 #ifdef BACKWARDS 677 if (*fnp == '\0' && *old_filename == '\0') { 678 sprintf(errmsg, "no current filename"); 679 return ERR; 680 } 681 #endif 682 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 683 return ERR; 684 else if (addr && addr != addr_last) 685 modified = 1; 686 break; 687 case 's': 688 do { 689 switch(*ibufp) { 690 case '\n': 691 sflags |=SGF; 692 break; 693 case 'g': 694 sflags |= SGG; 695 ibufp++; 696 break; 697 case 'p': 698 sflags |= SGP; 699 ibufp++; 700 break; 701 case 'r': 702 sflags |= SGR; 703 ibufp++; 704 break; 705 case '0': case '1': case '2': case '3': case '4': 706 case '5': case '6': case '7': case '8': case '9': 707 STRTOL(sgnum, ibufp); 708 sflags |= SGF; 709 sgflag &= ~GSG; /* override GSG */ 710 break; 711 default: 712 if (sflags) { 713 sprintf(errmsg, "invalid command suffix"); 714 return ERR; 715 } 716 } 717 } while (sflags && *ibufp != '\n'); 718 if (sflags && !pat) { 719 sprintf(errmsg, "no previous substitution"); 720 return ERR; 721 } else if (sflags & SGG) 722 sgnum = 0; /* override numeric arg */ 723 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 724 sprintf(errmsg, "invalid pattern delimiter"); 725 return ERR; 726 } 727 tpat = pat; 728 SPL1(); 729 if ((!sflags || (sflags & SGR)) && 730 (tpat = get_compiled_pattern()) == NULL) { 731 SPL0(); 732 return ERR; 733 } else if (tpat != pat) { 734 if (pat) { 735 regfree(pat); 736 free(pat); 737 } 738 pat = tpat; 739 patlock = 1; /* reserve pattern */ 740 } 741 SPL0(); 742 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 743 return ERR; 744 else if (isglobal) 745 sgflag |= GLB; 746 else 747 sgflag &= ~GLB; 748 if (sflags & SGG) 749 sgflag ^= GSG; 750 if (sflags & SGP) 751 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 752 do { 753 switch(*ibufp) { 754 case 'p': 755 sgflag |= GPR, ibufp++; 756 break; 757 case 'l': 758 sgflag |= GLS, ibufp++; 759 break; 760 case 'n': 761 sgflag |= GNP, ibufp++; 762 break; 763 default: 764 n++; 765 } 766 } while (!n); 767 if (check_addr_range(current_addr, current_addr) < 0) 768 return ERR; 769 GET_COMMAND_SUFFIX(); 770 if (!isglobal) clear_undo_stack(); 771 if (search_and_replace(pat, sgflag, sgnum) < 0) 772 return ERR; 773 break; 774 case 't': 775 if (check_addr_range(current_addr, current_addr) < 0) 776 return ERR; 777 GET_THIRD_ADDR(addr); 778 GET_COMMAND_SUFFIX(); 779 if (!isglobal) clear_undo_stack(); 780 if (copy_lines(addr) < 0) 781 return ERR; 782 break; 783 case 'u': 784 if (addr_cnt > 0) { 785 sprintf(errmsg, "unexpected address"); 786 return ERR; 787 } 788 GET_COMMAND_SUFFIX(); 789 if (pop_undo_stack() < 0) 790 return ERR; 791 break; 792 case 'w': 793 case 'W': 794 if ((n = *ibufp) == 'q' || n == 'Q') { 795 gflag = EOF; 796 ibufp++; 797 } 798 if (!isspace((unsigned char)*ibufp)) { 799 sprintf(errmsg, "unexpected command suffix"); 800 return ERR; 801 } else if ((fnp = get_filename()) == NULL) 802 return ERR; 803 if (addr_cnt == 0 && !addr_last) 804 first_addr = second_addr = 0; 805 else if (check_addr_range(1, addr_last) < 0) 806 return ERR; 807 GET_COMMAND_SUFFIX(); 808 if (*old_filename == '\0' && *fnp != '!') 809 strcpy(old_filename, fnp); 810 #ifdef BACKWARDS 811 if (*fnp == '\0' && *old_filename == '\0') { 812 sprintf(errmsg, "no current filename"); 813 return ERR; 814 } 815 #endif 816 if ((addr = write_file(*fnp ? fnp : old_filename, 817 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 818 return ERR; 819 else if (addr == addr_last) 820 modified = 0; 821 else if (modified && !scripted && n == 'q') 822 gflag = EMOD; 823 break; 824 case 'x': 825 if (addr_cnt > 0) { 826 sprintf(errmsg, "unexpected address"); 827 return ERR; 828 } 829 GET_COMMAND_SUFFIX(); 830 #ifdef DES 831 des = get_keyword(); 832 #else 833 sprintf(errmsg, "crypt unavailable"); 834 return ERR; 835 #endif 836 break; 837 case 'z': 838 #ifdef BACKWARDS 839 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 840 #else 841 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 842 #endif 843 return ERR; 844 else if ('0' < *ibufp && *ibufp <= '9') 845 STRTOL(rows, ibufp); 846 GET_COMMAND_SUFFIX(); 847 if (display_lines(second_addr, min(addr_last, 848 second_addr + rows), gflag) < 0) 849 return ERR; 850 gflag = 0; 851 break; 852 case '=': 853 GET_COMMAND_SUFFIX(); 854 printf("%ld\n", addr_cnt ? second_addr : addr_last); 855 break; 856 case '!': 857 if (addr_cnt > 0) { 858 sprintf(errmsg, "unexpected address"); 859 return ERR; 860 } else if ((sflags = get_shell_command()) < 0) 861 return ERR; 862 GET_COMMAND_SUFFIX(); 863 if (sflags) printf("%s\n", shcmd + 1); 864 system(shcmd + 1); 865 if (!scripted) printf("!\n"); 866 break; 867 case '\n': 868 #ifdef BACKWARDS 869 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 870 #else 871 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 872 #endif 873 || display_lines(second_addr, second_addr, 0) < 0) 874 return ERR; 875 break; 876 default: 877 sprintf(errmsg, "unknown command"); 878 return ERR; 879 } 880 return gflag; 881 } 882 883 884 /* check_addr_range: return status of address range check */ 885 int 886 check_addr_range(n, m) 887 long n, m; 888 { 889 if (addr_cnt == 0) { 890 first_addr = n; 891 second_addr = m; 892 } 893 if (first_addr > second_addr || 1 > first_addr || 894 second_addr > addr_last) { 895 sprintf(errmsg, "invalid address"); 896 return ERR; 897 } 898 return 0; 899 } 900 901 902 /* get_matching_node_addr: return the address of the next line matching a 903 pattern in a given direction. wrap around begin/end of editor buffer if 904 necessary */ 905 long 906 get_matching_node_addr(pat, dir) 907 pattern_t *pat; 908 int dir; 909 { 910 char *s; 911 long n = current_addr; 912 line_t *lp; 913 914 if (!pat) return ERR; 915 do { 916 if ((n = dir ? INC_MOD(n, addr_last) : 917 DEC_MOD(n, addr_last)) != 0) { 918 lp = get_addressed_line_node(n); 919 if ((s = get_sbuf_line(lp)) == NULL) 920 return ERR; 921 if (isbinary) 922 NUL_TO_NEWLINE(s, lp->len); 923 if (!regexec(pat, s, 0, NULL, 0)) 924 return n; 925 } 926 } while (n != current_addr); 927 sprintf(errmsg, "no match"); 928 return ERR; 929 } 930 931 932 /* get_filename: return pointer to copy of filename in the command buffer */ 933 char * 934 get_filename() 935 { 936 static char *file = NULL; 937 static int filesz = 0; 938 939 int n; 940 941 if (*ibufp != '\n') { 942 SKIP_BLANKS(); 943 if (*ibufp == '\n') { 944 sprintf(errmsg, "invalid filename"); 945 return NULL; 946 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 947 return NULL; 948 else if (*ibufp == '!') { 949 ibufp++; 950 if ((n = get_shell_command()) < 0) 951 return NULL; 952 if (n) printf("%s\n", shcmd + 1); 953 return shcmd; 954 } else if (n - 1 > MAXPATHLEN) { 955 sprintf(errmsg, "filename too long"); 956 return NULL; 957 } 958 } 959 #ifndef BACKWARDS 960 else if (*old_filename == '\0') { 961 sprintf(errmsg, "no current filename"); 962 return NULL; 963 } 964 #endif 965 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 966 for (n = 0; *ibufp != '\n';) 967 file[n++] = *ibufp++; 968 file[n] = '\0'; 969 return is_legal_filename(file) ? file : NULL; 970 } 971 972 973 /* get_shell_command: read a shell command from stdin; return substitution 974 status */ 975 int 976 get_shell_command() 977 { 978 static char *buf = NULL; 979 static int n = 0; 980 981 char *s; /* substitution char pointer */ 982 int i = 0; 983 int j = 0; 984 985 if (red) { 986 sprintf(errmsg, "shell access restricted"); 987 return ERR; 988 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 989 return ERR; 990 REALLOC(buf, n, j + 1, ERR); 991 buf[i++] = '!'; /* prefix command w/ bang */ 992 while (*ibufp != '\n') 993 switch (*ibufp) { 994 default: 995 REALLOC(buf, n, i + 2, ERR); 996 buf[i++] = *ibufp; 997 if (*ibufp++ == '\\') 998 buf[i++] = *ibufp++; 999 break; 1000 case '!': 1001 if (s != ibufp) { 1002 REALLOC(buf, n, i + 1, ERR); 1003 buf[i++] = *ibufp++; 1004 } 1005 #ifdef BACKWARDS 1006 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1007 #else 1008 else if (shcmd == NULL) 1009 #endif 1010 { 1011 sprintf(errmsg, "no previous command"); 1012 return ERR; 1013 } else { 1014 REALLOC(buf, n, i + shcmdi, ERR); 1015 for (s = shcmd + 1; s < shcmd + shcmdi;) 1016 buf[i++] = *s++; 1017 s = ibufp++; 1018 } 1019 break; 1020 case '%': 1021 if (*old_filename == '\0') { 1022 sprintf(errmsg, "no current filename"); 1023 return ERR; 1024 } 1025 j = strlen(s = strip_escapes(old_filename)); 1026 REALLOC(buf, n, i + j, ERR); 1027 while (j--) 1028 buf[i++] = *s++; 1029 s = ibufp++; 1030 break; 1031 } 1032 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1033 memcpy(shcmd, buf, i); 1034 shcmd[shcmdi = i] = '\0'; 1035 return *s == '!' || *s == '%'; 1036 } 1037 1038 1039 /* append_lines: insert text from stdin to after line n; stop when either a 1040 single period is read or EOF; return status */ 1041 int 1042 append_lines(n) 1043 long n; 1044 { 1045 int l; 1046 char *lp = ibuf; 1047 char *eot; 1048 undo_t *up = NULL; 1049 1050 for (current_addr = n;;) { 1051 if (!isglobal) { 1052 if ((l = get_tty_line()) < 0) 1053 return ERR; 1054 else if (l == 0 || ibuf[l - 1] != '\n') { 1055 clearerr(stdin); 1056 return l ? EOF : 0; 1057 } 1058 lp = ibuf; 1059 } else if (*(lp = ibufp) == '\0') 1060 return 0; 1061 else { 1062 while (*ibufp++ != '\n') 1063 ; 1064 l = ibufp - lp; 1065 } 1066 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1067 return 0; 1068 } 1069 eot = lp + l; 1070 SPL1(); 1071 do { 1072 if ((lp = put_sbuf_line(lp)) == NULL) { 1073 SPL0(); 1074 return ERR; 1075 } else if (up) 1076 up->t = get_addressed_line_node(current_addr); 1077 else if ((up = push_undo_stack(UADD, current_addr, 1078 current_addr)) == NULL) { 1079 SPL0(); 1080 return ERR; 1081 } 1082 } while (lp != eot); 1083 modified = 1; 1084 SPL0(); 1085 } 1086 /* NOTREACHED */ 1087 } 1088 1089 1090 /* join_lines: replace a range of lines with the joined text of those lines */ 1091 int 1092 join_lines(from, to) 1093 long from; 1094 long to; 1095 { 1096 static char *buf = NULL; 1097 static int n; 1098 1099 char *s; 1100 int size = 0; 1101 line_t *bp, *ep; 1102 1103 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1104 bp = get_addressed_line_node(from); 1105 for (; bp != ep; bp = bp->q_forw) { 1106 if ((s = get_sbuf_line(bp)) == NULL) 1107 return ERR; 1108 REALLOC(buf, n, size + bp->len, ERR); 1109 memcpy(buf + size, s, bp->len); 1110 size += bp->len; 1111 } 1112 REALLOC(buf, n, size + 2, ERR); 1113 memcpy(buf + size, "\n", 2); 1114 if (delete_lines(from, to) < 0) 1115 return ERR; 1116 current_addr = from - 1; 1117 SPL1(); 1118 if (put_sbuf_line(buf) == NULL || 1119 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1120 SPL0(); 1121 return ERR; 1122 } 1123 modified = 1; 1124 SPL0(); 1125 return 0; 1126 } 1127 1128 1129 /* move_lines: move a range of lines */ 1130 int 1131 move_lines(addr) 1132 long addr; 1133 { 1134 line_t *b1, *a1, *b2, *a2; 1135 long n = INC_MOD(second_addr, addr_last); 1136 long p = first_addr - 1; 1137 int done = (addr == first_addr - 1 || addr == second_addr); 1138 1139 SPL1(); 1140 if (done) { 1141 a2 = get_addressed_line_node(n); 1142 b2 = get_addressed_line_node(p); 1143 current_addr = second_addr; 1144 } else if (push_undo_stack(UMOV, p, n) == NULL || 1145 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1146 SPL0(); 1147 return ERR; 1148 } else { 1149 a1 = get_addressed_line_node(n); 1150 if (addr < first_addr) { 1151 b1 = get_addressed_line_node(p); 1152 b2 = get_addressed_line_node(addr); 1153 /* this get_addressed_line_node last! */ 1154 } else { 1155 b2 = get_addressed_line_node(addr); 1156 b1 = get_addressed_line_node(p); 1157 /* this get_addressed_line_node last! */ 1158 } 1159 a2 = b2->q_forw; 1160 REQUE(b2, b1->q_forw); 1161 REQUE(a1->q_back, a2); 1162 REQUE(b1, a1); 1163 current_addr = addr + ((addr < first_addr) ? 1164 second_addr - first_addr + 1 : 0); 1165 } 1166 if (isglobal) 1167 unset_active_nodes(b2->q_forw, a2); 1168 modified = 1; 1169 SPL0(); 1170 return 0; 1171 } 1172 1173 1174 /* copy_lines: copy a range of lines; return status */ 1175 int 1176 copy_lines(addr) 1177 long addr; 1178 { 1179 line_t *lp, *np = get_addressed_line_node(first_addr); 1180 undo_t *up = NULL; 1181 long n = second_addr - first_addr + 1; 1182 long m = 0; 1183 1184 current_addr = addr; 1185 if (first_addr <= addr && addr < second_addr) { 1186 n = addr - first_addr + 1; 1187 m = second_addr - addr; 1188 } 1189 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1190 for (; n-- > 0; np = np->q_forw) { 1191 SPL1(); 1192 if ((lp = dup_line_node(np)) == NULL) { 1193 SPL0(); 1194 return ERR; 1195 } 1196 add_line_node(lp); 1197 if (up) 1198 up->t = lp; 1199 else if ((up = push_undo_stack(UADD, current_addr, 1200 current_addr)) == NULL) { 1201 SPL0(); 1202 return ERR; 1203 } 1204 modified = 1; 1205 SPL0(); 1206 } 1207 return 0; 1208 } 1209 1210 1211 /* delete_lines: delete a range of lines */ 1212 int 1213 delete_lines(from, to) 1214 long from, to; 1215 { 1216 line_t *n, *p; 1217 1218 SPL1(); 1219 if (push_undo_stack(UDEL, from, to) == NULL) { 1220 SPL0(); 1221 return ERR; 1222 } 1223 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1224 p = get_addressed_line_node(from - 1); 1225 /* this get_addressed_line_node last! */ 1226 if (isglobal) 1227 unset_active_nodes(p->q_forw, n); 1228 REQUE(p, n); 1229 addr_last -= to - from + 1; 1230 current_addr = from - 1; 1231 modified = 1; 1232 SPL0(); 1233 return 0; 1234 } 1235 1236 1237 /* display_lines: print a range of lines to stdout */ 1238 int 1239 display_lines(from, to, gflag) 1240 long from; 1241 long to; 1242 int gflag; 1243 { 1244 line_t *bp; 1245 line_t *ep; 1246 char *s; 1247 1248 if (!from) { 1249 sprintf(errmsg, "invalid address"); 1250 return ERR; 1251 } 1252 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1253 bp = get_addressed_line_node(from); 1254 for (; bp != ep; bp = bp->q_forw) { 1255 if ((s = get_sbuf_line(bp)) == NULL) 1256 return ERR; 1257 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1258 return ERR; 1259 } 1260 return 0; 1261 } 1262 1263 1264 #define MAXMARK 26 /* max number of marks */ 1265 1266 line_t *mark[MAXMARK]; /* line markers */ 1267 int markno; /* line marker count */ 1268 1269 /* mark_line_node: set a line node mark */ 1270 int 1271 mark_line_node(lp, n) 1272 line_t *lp; 1273 int n; 1274 { 1275 if (!islower(n)) { 1276 sprintf(errmsg, "invalid mark character"); 1277 return ERR; 1278 } else if (mark[n - 'a'] == NULL) 1279 markno++; 1280 mark[n - 'a'] = lp; 1281 return 0; 1282 } 1283 1284 1285 /* get_marked_node_addr: return address of a marked line */ 1286 long 1287 get_marked_node_addr(n) 1288 int n; 1289 { 1290 if (!islower(n)) { 1291 sprintf(errmsg, "invalid mark character"); 1292 return ERR; 1293 } 1294 return get_line_node_addr(mark[n - 'a']); 1295 } 1296 1297 1298 /* unmark_line_node: clear line node mark */ 1299 void 1300 unmark_line_node(lp) 1301 line_t *lp; 1302 { 1303 int i; 1304 1305 for (i = 0; markno && i < MAXMARK; i++) 1306 if (mark[i] == lp) { 1307 mark[i] = NULL; 1308 markno--; 1309 } 1310 } 1311 1312 1313 /* dup_line_node: return a pointer to a copy of a line node */ 1314 line_t * 1315 dup_line_node(lp) 1316 line_t *lp; 1317 { 1318 line_t *np; 1319 1320 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1321 fprintf(stderr, "%s\n", strerror(errno)); 1322 sprintf(errmsg, "out of memory"); 1323 return NULL; 1324 } 1325 np->seek = lp->seek; 1326 np->len = lp->len; 1327 return np; 1328 } 1329 1330 1331 /* has_trailing_escape: return the parity of escapes preceding a character 1332 in a string */ 1333 int 1334 has_trailing_escape(s, t) 1335 char *s; 1336 char *t; 1337 { 1338 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1339 } 1340 1341 1342 /* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1343 char * 1344 strip_escapes(s) 1345 char *s; 1346 { 1347 static char *file = NULL; 1348 static int filesz = 0; 1349 1350 int i = 0; 1351 1352 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 1353 /* assert: no trailing escape */ 1354 while ((file[i++] = (*s == '\\') != '\0' ? *++s : *s)) 1355 s++; 1356 return file; 1357 } 1358 1359 1360 void 1361 signal_hup(signo) 1362 int signo; 1363 { 1364 if (mutex) 1365 sigflags |= (1 << (signo - 1)); 1366 else handle_hup(signo); 1367 } 1368 1369 1370 void 1371 signal_int(signo) 1372 int signo; 1373 { 1374 if (mutex) 1375 sigflags |= (1 << (signo - 1)); 1376 else handle_int(signo); 1377 } 1378 1379 1380 void 1381 handle_hup(signo) 1382 int signo; 1383 { 1384 char *hup = NULL; /* hup filename */ 1385 char *s; 1386 int n; 1387 1388 if (!sigactive) 1389 quit(1); 1390 sigflags &= ~(1 << (signo - 1)); 1391 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1392 (s = getenv("HOME")) != NULL && 1393 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */ 1394 (hup = (char *) malloc(n + 10)) != NULL) { 1395 strcpy(hup, s); 1396 if (hup[n - 1] != '/') 1397 hup[n] = '/', hup[n+1] = '\0'; 1398 strcat(hup, "ed.hup"); 1399 write_file(hup, "w", 1, addr_last); 1400 } 1401 quit(2); 1402 } 1403 1404 1405 void 1406 handle_int(signo) 1407 int signo; 1408 { 1409 if (!sigactive) 1410 quit(1); 1411 sigflags &= ~(1 << (signo - 1)); 1412 #ifdef _POSIX_SOURCE 1413 siglongjmp(env, -1); 1414 #else 1415 longjmp(env, -1); 1416 #endif 1417 } 1418 1419 1420 int cols = 72; /* wrap column */ 1421 1422 void 1423 handle_winch(signo) 1424 int signo; 1425 { 1426 struct winsize ws; /* window size structure */ 1427 1428 sigflags &= ~(1 << (signo - 1)); 1429 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1430 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1431 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1432 } 1433 } 1434 1435 1436 /* is_legal_filename: return a legal filename */ 1437 int 1438 is_legal_filename(s) 1439 char *s; 1440 { 1441 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1442 sprintf(errmsg, "shell access restricted"); 1443 return 0; 1444 } 1445 return 1; 1446 } 1447