main.c revision 59797
1/* main.c: This file contains the main control and user-interface routines 2 for the ed line editor. */ 3/*- 4 * Copyright (c) 1993 Andrew Moore, Talke Studio. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#ifndef lint 30static char * const copyright = 31"@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\ 32 All rights reserved.\n"; 33#endif /* not lint */ 34 35#ifndef lint 36#if 0 37static char * const rcsid = "@(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp"; 38#else 39static char * const rcsid = 40 "$FreeBSD: head/bin/ed/main.c 59797 2000-04-30 20:46:14Z joe $"; 41#endif 42#endif /* not lint */ 43 44/* 45 * CREDITS 46 * 47 * This program is based on the editor algorithm described in 48 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 49 * in Pascal," Addison-Wesley, 1981. 50 * 51 * The buffering algorithm is attributed to Rodney Ruddock of 52 * the University of Guelph, Guelph, Ontario. 53 * 54 * The cbc.c encryption code is adapted from 55 * the bdes program by Matt Bishop of Dartmouth College, 56 * Hanover, NH. 57 * 58 */ 59 60#include <sys/ioctl.h> 61#include <sys/wait.h> 62#include <ctype.h> 63#include <locale.h> 64#include <pwd.h> 65#include <setjmp.h> 66 67#include "ed.h" 68 69 70#ifdef _POSIX_SOURCE 71sigjmp_buf env; 72#else 73jmp_buf env; 74#endif 75 76/* static buffers */ 77char stdinbuf[1]; /* stdin buffer */ 78char *shcmd; /* shell command buffer */ 79int shcmdsz; /* shell command buffer size */ 80int shcmdi; /* shell command buffer index */ 81char *ibuf; /* ed command-line buffer */ 82int ibufsz; /* ed command-line buffer size */ 83char *ibufp; /* pointer to ed command-line buffer */ 84 85/* global flags */ 86int des = 0; /* if set, use crypt(3) for i/o */ 87int garrulous = 0; /* if set, print all error messages */ 88int isbinary; /* if set, buffer contains ASCII NULs */ 89int isglobal; /* if set, doing a global command */ 90int modified; /* if set, buffer modified since last write */ 91int mutex = 0; /* if set, signals set "sigflags" */ 92int red = 0; /* if set, restrict shell/directory access */ 93int scripted = 0; /* if set, suppress diagnostics */ 94int sigflags = 0; /* if set, signals received while mutex set */ 95int sigactive = 0; /* if set, signal handlers are enabled */ 96 97char old_filename[MAXPATHLEN + 1] = ""; /* default filename */ 98long current_addr; /* current address in editor buffer */ 99long addr_last; /* last address in editor buffer */ 100int lineno; /* script line number */ 101char *prompt; /* command-line prompt */ 102char *dps = "*"; /* default command-line prompt */ 103 104char *usage = "usage: %s [-] [-sx] [-p string] [name]\n"; 105 106/* ed: line editor */ 107int 108main(argc, argv) 109 int argc; 110 char **argv; 111{ 112 int c, n; 113 long status = 0; 114#if __GNUC__ 115 /* Avoid longjmp clobbering */ 116 (void) &argc; 117 (void) &argv; 118#endif 119 120 (void)setlocale(LC_ALL, ""); 121 122 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 123top: 124 while ((c = getopt(argc, argv, "p:sx")) != -1) 125 switch(c) { 126 case 'p': /* set prompt */ 127 prompt = optarg; 128 break; 129 case 's': /* run script */ 130 scripted = 1; 131 break; 132 case 'x': /* use crypt */ 133#ifdef DES 134 des = get_keyword(); 135#else 136 fprintf(stderr, "crypt unavailable\n?\n"); 137#endif 138 break; 139 140 default: 141 fprintf(stderr, usage, argv[0]); 142 exit(1); 143 } 144 argv += optind; 145 argc -= optind; 146 if (argc && **argv == '-') { 147 scripted = 1; 148 if (argc > 1) { 149 optind = 1; 150 goto top; 151 } 152 argv++; 153 argc--; 154 } 155 /* assert: reliable signals! */ 156#ifdef SIGWINCH 157 handle_winch(SIGWINCH); 158 if (isatty(0)) signal(SIGWINCH, handle_winch); 159#endif 160 signal(SIGHUP, signal_hup); 161 signal(SIGQUIT, SIG_IGN); 162 signal(SIGINT, signal_int); 163#ifdef _POSIX_SOURCE 164 if ((status = sigsetjmp(env, 1))) 165#else 166 if ((status = setjmp(env))) 167#endif 168 { 169 fputs("\n?\n", stderr); 170 sprintf(errmsg, "interrupt"); 171 } else { 172 init_buffers(); 173 sigactive = 1; /* enable signal handlers */ 174 if (argc && **argv && is_legal_filename(*argv)) { 175 if (read_file(*argv, 0) < 0 && !isatty(0)) 176 quit(2); 177 else if (**argv != '!') 178 if (strlcpy(old_filename, *argv, sizeof(old_filename)) 179 >= sizeof(old_filename)) 180 quit(2); 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 || 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 266long 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 */ 270int 271extract_addr_range() 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') ibufp++ 293 294#define MUST_BE_FIRST() \ 295 if (!first) { sprintf(errmsg, "invalid address"); return ERR; } 296 297/* next_addr: return the next line address in the command buffer */ 298long 299next_addr() 300{ 301 char *hd; 302 long addr = current_addr; 303 long n; 304 int first = 1; 305 int c; 306 307 SKIP_BLANKS(); 308 for (hd = ibufp;; first = 0) 309 switch (c = *ibufp) { 310 case '+': 311 case '\t': 312 case ' ': 313 case '-': 314 case '^': 315 ibufp++; 316 SKIP_BLANKS(); 317 if (isdigit((unsigned char)*ibufp)) { 318 STRTOL(n, ibufp); 319 addr += (c == '-' || c == '^') ? -n : n; 320 } else if (!isspace((unsigned char)c)) 321 addr += (c == '-' || c == '^') ? -1 : 1; 322 break; 323 case '0': case '1': case '2': 324 case '3': case '4': case '5': 325 case '6': case '7': case '8': case '9': 326 MUST_BE_FIRST(); 327 STRTOL(addr, ibufp); 328 break; 329 case '.': 330 case '$': 331 MUST_BE_FIRST(); 332 ibufp++; 333 addr = (c == '.') ? current_addr : addr_last; 334 break; 335 case '/': 336 case '?': 337 MUST_BE_FIRST(); 338 if ((addr = get_matching_node_addr( 339 get_compiled_pattern(), c == '/')) < 0) 340 return ERR; 341 else if (c == *ibufp) 342 ibufp++; 343 break; 344 case '\'': 345 MUST_BE_FIRST(); 346 ibufp++; 347 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 348 return ERR; 349 break; 350 case '%': 351 case ',': 352 case ';': 353 if (first) { 354 ibufp++; 355 addr_cnt++; 356 second_addr = (c == ';') ? current_addr : 1; 357 addr = addr_last; 358 break; 359 } 360 /* FALL THROUGH */ 361 default: 362 if (ibufp == hd) 363 return EOF; 364 else if (addr < 0 || addr_last < addr) { 365 sprintf(errmsg, "invalid address"); 366 return ERR; 367 } else 368 return addr; 369 } 370 /* NOTREACHED */ 371} 372 373 374#ifdef BACKWARDS 375/* GET_THIRD_ADDR: get a legal address from the command buffer */ 376#define GET_THIRD_ADDR(addr) \ 377{ \ 378 long ol1, ol2; \ 379\ 380 ol1 = first_addr, ol2 = second_addr; \ 381 if (extract_addr_range() < 0) \ 382 return ERR; \ 383 else if (addr_cnt == 0) { \ 384 sprintf(errmsg, "destination expected"); \ 385 return ERR; \ 386 } else if (second_addr < 0 || addr_last < second_addr) { \ 387 sprintf(errmsg, "invalid address"); \ 388 return ERR; \ 389 } \ 390 addr = second_addr; \ 391 first_addr = ol1, second_addr = ol2; \ 392} 393#else /* BACKWARDS */ 394/* GET_THIRD_ADDR: get a legal address from the command buffer */ 395#define GET_THIRD_ADDR(addr) \ 396{ \ 397 long ol1, ol2; \ 398\ 399 ol1 = first_addr, ol2 = second_addr; \ 400 if (extract_addr_range() < 0) \ 401 return ERR; \ 402 if (second_addr < 0 || addr_last < second_addr) { \ 403 sprintf(errmsg, "invalid address"); \ 404 return ERR; \ 405 } \ 406 addr = second_addr; \ 407 first_addr = ol1, second_addr = ol2; \ 408} 409#endif 410 411 412/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 413#define GET_COMMAND_SUFFIX() { \ 414 int done = 0; \ 415 do { \ 416 switch(*ibufp) { \ 417 case 'p': \ 418 gflag |= GPR, ibufp++; \ 419 break; \ 420 case 'l': \ 421 gflag |= GLS, ibufp++; \ 422 break; \ 423 case 'n': \ 424 gflag |= GNP, ibufp++; \ 425 break; \ 426 default: \ 427 done++; \ 428 } \ 429 } while (!done); \ 430 if (*ibufp++ != '\n') { \ 431 sprintf(errmsg, "invalid command suffix"); \ 432 return ERR; \ 433 } \ 434} 435 436 437/* sflags */ 438#define SGG 001 /* complement previous global substitute suffix */ 439#define SGP 002 /* complement previous print suffix */ 440#define SGR 004 /* use last regex instead of last pat */ 441#define SGF 010 /* repeat last substitution */ 442 443int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 444 445long rows = 22; /* scroll length: ws_row - 2 */ 446 447/* exec_command: execute the next command in command buffer; return print 448 request, if any */ 449int 450exec_command() 451{ 452 extern long u_current_addr; 453 extern long u_addr_last; 454 455 static pattern_t *pat = NULL; 456 static int sgflag = 0; 457 static long sgnum = 0; 458 459 pattern_t *tpat; 460 char *fnp; 461 int gflag = 0; 462 int sflags = 0; 463 long addr = 0; 464 int n = 0; 465 int c; 466 467 SKIP_BLANKS(); 468 switch(c = *ibufp++) { 469 case 'a': 470 GET_COMMAND_SUFFIX(); 471 if (!isglobal) clear_undo_stack(); 472 if (append_lines(second_addr) < 0) 473 return ERR; 474 break; 475 case 'c': 476 if (check_addr_range(current_addr, current_addr) < 0) 477 return ERR; 478 GET_COMMAND_SUFFIX(); 479 if (!isglobal) clear_undo_stack(); 480 if (delete_lines(first_addr, second_addr) < 0 || 481 append_lines(current_addr) < 0) 482 return ERR; 483 break; 484 case 'd': 485 if (check_addr_range(current_addr, current_addr) < 0) 486 return ERR; 487 GET_COMMAND_SUFFIX(); 488 if (!isglobal) clear_undo_stack(); 489 if (delete_lines(first_addr, second_addr) < 0) 490 return ERR; 491 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 492 current_addr = addr; 493 break; 494 case 'e': 495 if (modified && !scripted) 496 return EMOD; 497 /* fall through */ 498 case 'E': 499 if (addr_cnt > 0) { 500 sprintf(errmsg, "unexpected address"); 501 return ERR; 502 } else if (!isspace((unsigned char)*ibufp)) { 503 sprintf(errmsg, "unexpected command suffix"); 504 return ERR; 505 } else if ((fnp = get_filename()) == NULL) 506 return ERR; 507 GET_COMMAND_SUFFIX(); 508 if (delete_lines(1, addr_last) < 0) 509 return ERR; 510 clear_undo_stack(); 511 if (close_sbuf() < 0) 512 return ERR; 513 else if (open_sbuf() < 0) 514 return FATAL; 515 if (*fnp && *fnp != '!') strcpy(old_filename, fnp); 516#ifdef BACKWARDS 517 if (*fnp == '\0' && *old_filename == '\0') { 518 sprintf(errmsg, "no current filename"); 519 return ERR; 520 } 521#endif 522 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 523 return ERR; 524 clear_undo_stack(); 525 modified = 0; 526 u_current_addr = u_addr_last = -1; 527 break; 528 case 'f': 529 if (addr_cnt > 0) { 530 sprintf(errmsg, "unexpected address"); 531 return ERR; 532 } else if (!isspace((unsigned char)*ibufp)) { 533 sprintf(errmsg, "unexpected command suffix"); 534 return ERR; 535 } else if ((fnp = get_filename()) == NULL) 536 return ERR; 537 else if (*fnp == '!') { 538 sprintf(errmsg, "invalid redirection"); 539 return ERR; 540 } 541 GET_COMMAND_SUFFIX(); 542 if (*fnp) strcpy(old_filename, fnp); 543 printf("%s\n", strip_escapes(old_filename)); 544 break; 545 case 'g': 546 case 'v': 547 case 'G': 548 case 'V': 549 if (isglobal) { 550 sprintf(errmsg, "cannot nest global commands"); 551 return ERR; 552 } else if (check_addr_range(1, addr_last) < 0) 553 return ERR; 554 else if (build_active_list(c == 'g' || c == 'G') < 0) 555 return ERR; 556 else if ((n = (c == 'G' || c == 'V'))) 557 GET_COMMAND_SUFFIX(); 558 isglobal++; 559 if (exec_global(n, gflag) < 0) 560 return ERR; 561 break; 562 case 'h': 563 if (addr_cnt > 0) { 564 sprintf(errmsg, "unexpected address"); 565 return ERR; 566 } 567 GET_COMMAND_SUFFIX(); 568 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 569 break; 570 case 'H': 571 if (addr_cnt > 0) { 572 sprintf(errmsg, "unexpected address"); 573 return ERR; 574 } 575 GET_COMMAND_SUFFIX(); 576 if ((garrulous = 1 - garrulous) && *errmsg) 577 fprintf(stderr, "%s\n", errmsg); 578 break; 579 case 'i': 580 if (second_addr == 0) { 581 sprintf(errmsg, "invalid address"); 582 return ERR; 583 } 584 GET_COMMAND_SUFFIX(); 585 if (!isglobal) clear_undo_stack(); 586 if (append_lines(second_addr - 1) < 0) 587 return ERR; 588 break; 589 case 'j': 590 if (check_addr_range(current_addr, current_addr + 1) < 0) 591 return ERR; 592 GET_COMMAND_SUFFIX(); 593 if (!isglobal) clear_undo_stack(); 594 if (first_addr != second_addr && 595 join_lines(first_addr, second_addr) < 0) 596 return ERR; 597 break; 598 case 'k': 599 c = *ibufp++; 600 if (second_addr == 0) { 601 sprintf(errmsg, "invalid address"); 602 return ERR; 603 } 604 GET_COMMAND_SUFFIX(); 605 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 606 return ERR; 607 break; 608 case 'l': 609 if (check_addr_range(current_addr, current_addr) < 0) 610 return ERR; 611 GET_COMMAND_SUFFIX(); 612 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 613 return ERR; 614 gflag = 0; 615 break; 616 case 'm': 617 if (check_addr_range(current_addr, current_addr) < 0) 618 return ERR; 619 GET_THIRD_ADDR(addr); 620 if (first_addr <= addr && addr < second_addr) { 621 sprintf(errmsg, "invalid destination"); 622 return ERR; 623 } 624 GET_COMMAND_SUFFIX(); 625 if (!isglobal) clear_undo_stack(); 626 if (move_lines(addr) < 0) 627 return ERR; 628 break; 629 case 'n': 630 if (check_addr_range(current_addr, current_addr) < 0) 631 return ERR; 632 GET_COMMAND_SUFFIX(); 633 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 634 return ERR; 635 gflag = 0; 636 break; 637 case 'p': 638 if (check_addr_range(current_addr, current_addr) < 0) 639 return ERR; 640 GET_COMMAND_SUFFIX(); 641 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 642 return ERR; 643 gflag = 0; 644 break; 645 case 'P': 646 if (addr_cnt > 0) { 647 sprintf(errmsg, "unexpected address"); 648 return ERR; 649 } 650 GET_COMMAND_SUFFIX(); 651 prompt = prompt ? NULL : optarg ? optarg : dps; 652 break; 653 case 'q': 654 case 'Q': 655 if (addr_cnt > 0) { 656 sprintf(errmsg, "unexpected address"); 657 return ERR; 658 } 659 GET_COMMAND_SUFFIX(); 660 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 661 break; 662 case 'r': 663 if (!isspace((unsigned char)*ibufp)) { 664 sprintf(errmsg, "unexpected command suffix"); 665 return ERR; 666 } else if (addr_cnt == 0) 667 second_addr = addr_last; 668 if ((fnp = get_filename()) == NULL) 669 return ERR; 670 GET_COMMAND_SUFFIX(); 671 if (!isglobal) clear_undo_stack(); 672 if (*old_filename == '\0' && *fnp != '!') 673 strcpy(old_filename, fnp); 674#ifdef BACKWARDS 675 if (*fnp == '\0' && *old_filename == '\0') { 676 sprintf(errmsg, "no current filename"); 677 return ERR; 678 } 679#endif 680 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 681 return ERR; 682 else if (addr && addr != addr_last) 683 modified = 1; 684 break; 685 case 's': 686 do { 687 switch(*ibufp) { 688 case '\n': 689 sflags |=SGF; 690 break; 691 case 'g': 692 sflags |= SGG; 693 ibufp++; 694 break; 695 case 'p': 696 sflags |= SGP; 697 ibufp++; 698 break; 699 case 'r': 700 sflags |= SGR; 701 ibufp++; 702 break; 703 case '0': case '1': case '2': case '3': case '4': 704 case '5': case '6': case '7': case '8': case '9': 705 STRTOL(sgnum, ibufp); 706 sflags |= SGF; 707 sgflag &= ~GSG; /* override GSG */ 708 break; 709 default: 710 if (sflags) { 711 sprintf(errmsg, "invalid command suffix"); 712 return ERR; 713 } 714 } 715 } while (sflags && *ibufp != '\n'); 716 if (sflags && !pat) { 717 sprintf(errmsg, "no previous substitution"); 718 return ERR; 719 } else if (sflags & SGG) 720 sgnum = 0; /* override numeric arg */ 721 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 722 sprintf(errmsg, "invalid pattern delimiter"); 723 return ERR; 724 } 725 tpat = pat; 726 SPL1(); 727 if ((!sflags || (sflags & SGR)) && 728 (tpat = get_compiled_pattern()) == NULL) { 729 SPL0(); 730 return ERR; 731 } else if (tpat != pat) { 732 if (pat) { 733 regfree(pat); 734 free(pat); 735 } 736 pat = tpat; 737 patlock = 1; /* reserve pattern */ 738 } 739 SPL0(); 740 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 741 return ERR; 742 else if (isglobal) 743 sgflag |= GLB; 744 else 745 sgflag &= ~GLB; 746 if (sflags & SGG) 747 sgflag ^= GSG; 748 if (sflags & SGP) 749 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 750 do { 751 switch(*ibufp) { 752 case 'p': 753 sgflag |= GPR, ibufp++; 754 break; 755 case 'l': 756 sgflag |= GLS, ibufp++; 757 break; 758 case 'n': 759 sgflag |= GNP, ibufp++; 760 break; 761 default: 762 n++; 763 } 764 } while (!n); 765 if (check_addr_range(current_addr, current_addr) < 0) 766 return ERR; 767 GET_COMMAND_SUFFIX(); 768 if (!isglobal) clear_undo_stack(); 769 if (search_and_replace(pat, sgflag, sgnum) < 0) 770 return ERR; 771 break; 772 case 't': 773 if (check_addr_range(current_addr, current_addr) < 0) 774 return ERR; 775 GET_THIRD_ADDR(addr); 776 GET_COMMAND_SUFFIX(); 777 if (!isglobal) clear_undo_stack(); 778 if (copy_lines(addr) < 0) 779 return ERR; 780 break; 781 case 'u': 782 if (addr_cnt > 0) { 783 sprintf(errmsg, "unexpected address"); 784 return ERR; 785 } 786 GET_COMMAND_SUFFIX(); 787 if (pop_undo_stack() < 0) 788 return ERR; 789 break; 790 case 'w': 791 case 'W': 792 if ((n = *ibufp) == 'q' || n == 'Q') { 793 gflag = EOF; 794 ibufp++; 795 } 796 if (!isspace((unsigned char)*ibufp)) { 797 sprintf(errmsg, "unexpected command suffix"); 798 return ERR; 799 } else if ((fnp = get_filename()) == NULL) 800 return ERR; 801 if (addr_cnt == 0 && !addr_last) 802 first_addr = second_addr = 0; 803 else if (check_addr_range(1, addr_last) < 0) 804 return ERR; 805 GET_COMMAND_SUFFIX(); 806 if (*old_filename == '\0' && *fnp != '!') 807 strcpy(old_filename, fnp); 808#ifdef BACKWARDS 809 if (*fnp == '\0' && *old_filename == '\0') { 810 sprintf(errmsg, "no current filename"); 811 return ERR; 812 } 813#endif 814 if ((addr = write_file(*fnp ? fnp : old_filename, 815 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 816 return ERR; 817 else if (addr == addr_last) 818 modified = 0; 819 else if (modified && !scripted && n == 'q') 820 gflag = EMOD; 821 break; 822 case 'x': 823 if (addr_cnt > 0) { 824 sprintf(errmsg, "unexpected address"); 825 return ERR; 826 } 827 GET_COMMAND_SUFFIX(); 828#ifdef DES 829 des = get_keyword(); 830#else 831 sprintf(errmsg, "crypt unavailable"); 832 return ERR; 833#endif 834 break; 835 case 'z': 836#ifdef BACKWARDS 837 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 838#else 839 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 840#endif 841 return ERR; 842 else if ('0' < *ibufp && *ibufp <= '9') 843 STRTOL(rows, ibufp); 844 GET_COMMAND_SUFFIX(); 845 if (display_lines(second_addr, min(addr_last, 846 second_addr + rows), gflag) < 0) 847 return ERR; 848 gflag = 0; 849 break; 850 case '=': 851 GET_COMMAND_SUFFIX(); 852 printf("%ld\n", addr_cnt ? second_addr : addr_last); 853 break; 854 case '!': 855 if (addr_cnt > 0) { 856 sprintf(errmsg, "unexpected address"); 857 return ERR; 858 } else if ((sflags = get_shell_command()) < 0) 859 return ERR; 860 GET_COMMAND_SUFFIX(); 861 if (sflags) printf("%s\n", shcmd + 1); 862 system(shcmd + 1); 863 if (!scripted) printf("!\n"); 864 break; 865 case '\n': 866#ifdef BACKWARDS 867 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 868#else 869 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 870#endif 871 || display_lines(second_addr, second_addr, 0) < 0) 872 return ERR; 873 break; 874 default: 875 sprintf(errmsg, "unknown command"); 876 return ERR; 877 } 878 return gflag; 879} 880 881 882/* check_addr_range: return status of address range check */ 883int 884check_addr_range(n, m) 885 long n, m; 886{ 887 if (addr_cnt == 0) { 888 first_addr = n; 889 second_addr = m; 890 } 891 if (first_addr > second_addr || 1 > first_addr || 892 second_addr > addr_last) { 893 sprintf(errmsg, "invalid address"); 894 return ERR; 895 } 896 return 0; 897} 898 899 900/* get_matching_node_addr: return the address of the next line matching a 901 pattern in a given direction. wrap around begin/end of editor buffer if 902 necessary */ 903long 904get_matching_node_addr(pat, dir) 905 pattern_t *pat; 906 int dir; 907{ 908 char *s; 909 long n = current_addr; 910 line_t *lp; 911 912 if (!pat) return ERR; 913 do { 914 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) { 915 lp = get_addressed_line_node(n); 916 if ((s = get_sbuf_line(lp)) == NULL) 917 return ERR; 918 if (isbinary) 919 NUL_TO_NEWLINE(s, lp->len); 920 if (!regexec(pat, s, 0, NULL, 0)) 921 return n; 922 } 923 } while (n != current_addr); 924 sprintf(errmsg, "no match"); 925 return ERR; 926} 927 928 929/* get_filename: return pointer to copy of filename in the command buffer */ 930char * 931get_filename() 932{ 933 static char *file = NULL; 934 static int filesz = 0; 935 936 int n; 937 938 if (*ibufp != '\n') { 939 SKIP_BLANKS(); 940 if (*ibufp == '\n') { 941 sprintf(errmsg, "invalid filename"); 942 return NULL; 943 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 944 return NULL; 945 else if (*ibufp == '!') { 946 ibufp++; 947 if ((n = get_shell_command()) < 0) 948 return NULL; 949 if (n) printf("%s\n", shcmd + 1); 950 return shcmd; 951 } else if (n - 1 > MAXPATHLEN) { 952 sprintf(errmsg, "filename too long"); 953 return NULL; 954 } 955 } 956#ifndef BACKWARDS 957 else if (*old_filename == '\0') { 958 sprintf(errmsg, "no current filename"); 959 return NULL; 960 } 961#endif 962 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 963 for (n = 0; *ibufp != '\n';) 964 file[n++] = *ibufp++; 965 file[n] = '\0'; 966 return is_legal_filename(file) ? file : NULL; 967} 968 969 970/* get_shell_command: read a shell command from stdin; return substitution 971 status */ 972int 973get_shell_command() 974{ 975 static char *buf = NULL; 976 static int n = 0; 977 978 char *s; /* substitution char pointer */ 979 int i = 0; 980 int j = 0; 981 982 if (red) { 983 sprintf(errmsg, "shell access restricted"); 984 return ERR; 985 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 986 return ERR; 987 REALLOC(buf, n, j + 1, ERR); 988 buf[i++] = '!'; /* prefix command w/ bang */ 989 while (*ibufp != '\n') 990 switch (*ibufp) { 991 default: 992 REALLOC(buf, n, i + 2, ERR); 993 buf[i++] = *ibufp; 994 if (*ibufp++ == '\\') 995 buf[i++] = *ibufp++; 996 break; 997 case '!': 998 if (s != ibufp) { 999 REALLOC(buf, n, i + 1, ERR); 1000 buf[i++] = *ibufp++; 1001 } 1002#ifdef BACKWARDS 1003 else if (shcmd == NULL || *(shcmd + 1) == '\0') 1004#else 1005 else if (shcmd == NULL) 1006#endif 1007 { 1008 sprintf(errmsg, "no previous command"); 1009 return ERR; 1010 } else { 1011 REALLOC(buf, n, i + shcmdi, ERR); 1012 for (s = shcmd + 1; s < shcmd + shcmdi;) 1013 buf[i++] = *s++; 1014 s = ibufp++; 1015 } 1016 break; 1017 case '%': 1018 if (*old_filename == '\0') { 1019 sprintf(errmsg, "no current filename"); 1020 return ERR; 1021 } 1022 j = strlen(s = strip_escapes(old_filename)); 1023 REALLOC(buf, n, i + j, ERR); 1024 while (j--) 1025 buf[i++] = *s++; 1026 s = ibufp++; 1027 break; 1028 } 1029 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1030 memcpy(shcmd, buf, i); 1031 shcmd[shcmdi = i] = '\0'; 1032 return *s == '!' || *s == '%'; 1033} 1034 1035 1036/* append_lines: insert text from stdin to after line n; stop when either a 1037 single period is read or EOF; return status */ 1038int 1039append_lines(n) 1040 long n; 1041{ 1042 int l; 1043 char *lp = ibuf; 1044 char *eot; 1045 undo_t *up = NULL; 1046 1047 for (current_addr = n;;) { 1048 if (!isglobal) { 1049 if ((l = get_tty_line()) < 0) 1050 return ERR; 1051 else if (l == 0 || ibuf[l - 1] != '\n') { 1052 clearerr(stdin); 1053 return l ? EOF : 0; 1054 } 1055 lp = ibuf; 1056 } else if (*(lp = ibufp) == '\0') 1057 return 0; 1058 else { 1059 while (*ibufp++ != '\n') 1060 ; 1061 l = ibufp - lp; 1062 } 1063 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1064 return 0; 1065 } 1066 eot = lp + l; 1067 SPL1(); 1068 do { 1069 if ((lp = put_sbuf_line(lp)) == NULL) { 1070 SPL0(); 1071 return ERR; 1072 } else if (up) 1073 up->t = get_addressed_line_node(current_addr); 1074 else if ((up = push_undo_stack(UADD, current_addr, 1075 current_addr)) == NULL) { 1076 SPL0(); 1077 return ERR; 1078 } 1079 } while (lp != eot); 1080 modified = 1; 1081 SPL0(); 1082 } 1083 /* NOTREACHED */ 1084} 1085 1086 1087/* join_lines: replace a range of lines with the joined text of those lines */ 1088int 1089join_lines(from, to) 1090 long from; 1091 long to; 1092{ 1093 static char *buf = NULL; 1094 static int n; 1095 1096 char *s; 1097 int size = 0; 1098 line_t *bp, *ep; 1099 1100 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1101 bp = get_addressed_line_node(from); 1102 for (; bp != ep; bp = bp->q_forw) { 1103 if ((s = get_sbuf_line(bp)) == NULL) 1104 return ERR; 1105 REALLOC(buf, n, size + bp->len, ERR); 1106 memcpy(buf + size, s, bp->len); 1107 size += bp->len; 1108 } 1109 REALLOC(buf, n, size + 2, ERR); 1110 memcpy(buf + size, "\n", 2); 1111 if (delete_lines(from, to) < 0) 1112 return ERR; 1113 current_addr = from - 1; 1114 SPL1(); 1115 if (put_sbuf_line(buf) == NULL || 1116 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1117 SPL0(); 1118 return ERR; 1119 } 1120 modified = 1; 1121 SPL0(); 1122 return 0; 1123} 1124 1125 1126/* move_lines: move a range of lines */ 1127int 1128move_lines(addr) 1129 long addr; 1130{ 1131 line_t *b1, *a1, *b2, *a2; 1132 long n = INC_MOD(second_addr, addr_last); 1133 long p = first_addr - 1; 1134 int done = (addr == first_addr - 1 || addr == second_addr); 1135 1136 SPL1(); 1137 if (done) { 1138 a2 = get_addressed_line_node(n); 1139 b2 = get_addressed_line_node(p); 1140 current_addr = second_addr; 1141 } else if (push_undo_stack(UMOV, p, n) == NULL || 1142 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1143 SPL0(); 1144 return ERR; 1145 } else { 1146 a1 = get_addressed_line_node(n); 1147 if (addr < first_addr) { 1148 b1 = get_addressed_line_node(p); 1149 b2 = get_addressed_line_node(addr); 1150 /* this get_addressed_line_node last! */ 1151 } else { 1152 b2 = get_addressed_line_node(addr); 1153 b1 = get_addressed_line_node(p); 1154 /* this get_addressed_line_node last! */ 1155 } 1156 a2 = b2->q_forw; 1157 REQUE(b2, b1->q_forw); 1158 REQUE(a1->q_back, a2); 1159 REQUE(b1, a1); 1160 current_addr = addr + ((addr < first_addr) ? 1161 second_addr - first_addr + 1 : 0); 1162 } 1163 if (isglobal) 1164 unset_active_nodes(b2->q_forw, a2); 1165 modified = 1; 1166 SPL0(); 1167 return 0; 1168} 1169 1170 1171/* copy_lines: copy a range of lines; return status */ 1172int 1173copy_lines(addr) 1174 long addr; 1175{ 1176 line_t *lp, *np = get_addressed_line_node(first_addr); 1177 undo_t *up = NULL; 1178 long n = second_addr - first_addr + 1; 1179 long m = 0; 1180 1181 current_addr = addr; 1182 if (first_addr <= addr && addr < second_addr) { 1183 n = addr - first_addr + 1; 1184 m = second_addr - addr; 1185 } 1186 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1187 for (; n-- > 0; np = np->q_forw) { 1188 SPL1(); 1189 if ((lp = dup_line_node(np)) == NULL) { 1190 SPL0(); 1191 return ERR; 1192 } 1193 add_line_node(lp); 1194 if (up) 1195 up->t = lp; 1196 else if ((up = push_undo_stack(UADD, current_addr, 1197 current_addr)) == NULL) { 1198 SPL0(); 1199 return ERR; 1200 } 1201 modified = 1; 1202 SPL0(); 1203 } 1204 return 0; 1205} 1206 1207 1208/* delete_lines: delete a range of lines */ 1209int 1210delete_lines(from, to) 1211 long from, to; 1212{ 1213 line_t *n, *p; 1214 1215 SPL1(); 1216 if (push_undo_stack(UDEL, from, to) == NULL) { 1217 SPL0(); 1218 return ERR; 1219 } 1220 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1221 p = get_addressed_line_node(from - 1); 1222 /* this get_addressed_line_node last! */ 1223 if (isglobal) 1224 unset_active_nodes(p->q_forw, n); 1225 REQUE(p, n); 1226 addr_last -= to - from + 1; 1227 current_addr = from - 1; 1228 modified = 1; 1229 SPL0(); 1230 return 0; 1231} 1232 1233 1234/* display_lines: print a range of lines to stdout */ 1235int 1236display_lines(from, to, gflag) 1237 long from; 1238 long to; 1239 int gflag; 1240{ 1241 line_t *bp; 1242 line_t *ep; 1243 char *s; 1244 1245 if (!from) { 1246 sprintf(errmsg, "invalid address"); 1247 return ERR; 1248 } 1249 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1250 bp = get_addressed_line_node(from); 1251 for (; bp != ep; bp = bp->q_forw) { 1252 if ((s = get_sbuf_line(bp)) == NULL) 1253 return ERR; 1254 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1255 return ERR; 1256 } 1257 return 0; 1258} 1259 1260 1261#define MAXMARK 26 /* max number of marks */ 1262 1263line_t *mark[MAXMARK]; /* line markers */ 1264int markno; /* line marker count */ 1265 1266/* mark_line_node: set a line node mark */ 1267int 1268mark_line_node(lp, n) 1269 line_t *lp; 1270 int n; 1271{ 1272 if (!islower((unsigned char)n)) { 1273 sprintf(errmsg, "invalid mark character"); 1274 return ERR; 1275 } else if (mark[n - 'a'] == NULL) 1276 markno++; 1277 mark[n - 'a'] = lp; 1278 return 0; 1279} 1280 1281 1282/* get_marked_node_addr: return address of a marked line */ 1283long 1284get_marked_node_addr(n) 1285 int n; 1286{ 1287 if (!islower((unsigned char)n)) { 1288 sprintf(errmsg, "invalid mark character"); 1289 return ERR; 1290 } 1291 return get_line_node_addr(mark[n - 'a']); 1292} 1293 1294 1295/* unmark_line_node: clear line node mark */ 1296void 1297unmark_line_node(lp) 1298 line_t *lp; 1299{ 1300 int i; 1301 1302 for (i = 0; markno && i < MAXMARK; i++) 1303 if (mark[i] == lp) { 1304 mark[i] = NULL; 1305 markno--; 1306 } 1307} 1308 1309 1310/* dup_line_node: return a pointer to a copy of a line node */ 1311line_t * 1312dup_line_node(lp) 1313 line_t *lp; 1314{ 1315 line_t *np; 1316 1317 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1318 fprintf(stderr, "%s\n", strerror(errno)); 1319 sprintf(errmsg, "out of memory"); 1320 return NULL; 1321 } 1322 np->seek = lp->seek; 1323 np->len = lp->len; 1324 return np; 1325} 1326 1327 1328/* has_trailing_escape: return the parity of escapes preceding a character 1329 in a string */ 1330int 1331has_trailing_escape(s, t) 1332 char *s; 1333 char *t; 1334{ 1335 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1336} 1337 1338 1339/* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1340char * 1341strip_escapes(s) 1342 char *s; 1343{ 1344 static char *file = NULL; 1345 static int filesz = 0; 1346 1347 int i = 0; 1348 1349 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 1350 while (i < filesz - 1 /* Worry about a possible trailing escape */ 1351 && (file[i++] = (*s == '\\') ? *++s : *s)) 1352 s++; 1353 return file; 1354} 1355 1356 1357void 1358signal_hup(signo) 1359 int signo; 1360{ 1361 if (mutex) 1362 sigflags |= (1 << (signo - 1)); 1363 else 1364 handle_hup(signo); 1365} 1366 1367 1368void 1369signal_int(signo) 1370 int signo; 1371{ 1372 if (mutex) 1373 sigflags |= (1 << (signo - 1)); 1374 else 1375 handle_int(signo); 1376} 1377 1378 1379void 1380handle_hup(signo) 1381 int signo; 1382{ 1383 char *hup = NULL; /* hup filename */ 1384 char *s; 1385 int n; 1386 1387 if (!sigactive) 1388 quit(1); 1389 sigflags &= ~(1 << (signo - 1)); 1390 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1391 (s = getenv("HOME")) != NULL && 1392 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */ 1393 (hup = (char *) malloc(n + 10)) != NULL) { 1394 strcpy(hup, s); 1395 if (hup[n - 1] != '/') 1396 hup[n] = '/', hup[n+1] = '\0'; 1397 strcat(hup, "ed.hup"); 1398 write_file(hup, "w", 1, addr_last); 1399 } 1400 quit(2); 1401} 1402 1403 1404void 1405handle_int(signo) 1406 int signo; 1407{ 1408 if (!sigactive) 1409 quit(1); 1410 sigflags &= ~(1 << (signo - 1)); 1411#ifdef _POSIX_SOURCE 1412 siglongjmp(env, -1); 1413#else 1414 longjmp(env, -1); 1415#endif 1416} 1417 1418 1419int cols = 72; /* wrap column */ 1420 1421void 1422handle_winch(signo) 1423 int signo; 1424{ 1425 int save_errno = errno; 1426 1427 struct winsize ws; /* window size structure */ 1428 1429 sigflags &= ~(1 << (signo - 1)); 1430 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1431 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1432 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1433 } 1434 errno = save_errno; 1435} 1436 1437 1438/* is_legal_filename: return a legal filename */ 1439int 1440is_legal_filename(s) 1441 char *s; 1442{ 1443 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1444 sprintf(errmsg, "shell access restricted"); 1445 return 0; 1446 } 1447 return 1; 1448} 1449