main.c revision 1057
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 30char *copyright = 31"@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\ 32 All rights reserved.\n"; 33#endif /* not lint */ 34 35#ifndef lint 36static char *rcsid = "@(#)$Id: main.c,v 1.5 1993/12/15 15:22:02 alm Exp alm $"; 37#endif /* not lint */ 38 39/* 40 * CREDITS 41 * 42 * This program is based on the editor algorithm described in 43 * Brian W. Kernighan and P. J. Plauger's book "Software Tools 44 * in Pascal," Addison-Wesley, 1981. 45 * 46 * The buffering algorithm is attributed to Rodney Ruddock of 47 * the University of Guelph, Guelph, Ontario. 48 * 49 * The cbc.c encryption code is adapted from 50 * the bdes program by Matt Bishop of Dartmouth College, 51 * Hanover, NH. 52 * 53 */ 54 55#include <sys/ioctl.h> 56#include <sys/wait.h> 57#include <ctype.h> 58#include <setjmp.h> 59#include <pwd.h> 60 61#include "ed.h" 62 63 64#ifdef _POSIX_SOURCE 65sigjmp_buf env; 66#else 67jmp_buf env; 68#endif 69 70/* static buffers */ 71char stdinbuf[1]; /* stdin buffer */ 72char *shcmd; /* shell command buffer */ 73int shcmdsz; /* shell command buffer size */ 74int shcmdi; /* shell command buffer index */ 75char *ibuf; /* ed command-line buffer */ 76int ibufsz; /* ed command-line buffer size */ 77char *ibufp; /* pointer to ed command-line buffer */ 78 79/* global flags */ 80int des = 0; /* if set, use crypt(3) for i/o */ 81int garrulous = 0; /* if set, print all error messages */ 82int isbinary; /* if set, buffer contains ASCII NULs */ 83int isglobal; /* if set, doing a global command */ 84int modified; /* if set, buffer modified since last write */ 85int mutex = 0; /* if set, signals set "sigflags" */ 86int red = 0; /* if set, restrict shell/directory access */ 87int scripted = 0; /* if set, suppress diagnostics */ 88int sigflags = 0; /* if set, signals received while mutex set */ 89int sigactive = 0; /* if set, signal handlers are enabled */ 90 91char old_filename[MAXPATHLEN + 1] = ""; /* default filename */ 92long current_addr; /* current address in editor buffer */ 93long addr_last; /* last address in editor buffer */ 94int lineno; /* script line number */ 95char *prompt; /* command-line prompt */ 96char *dps = "*"; /* default command-line prompt */ 97 98char *usage = "usage: %s [-] [-sx] [-p string] [name]\n"; 99 100extern char errmsg[]; 101extern int optind; 102extern char *optarg; 103 104/* ed: line editor */ 105int 106main(argc, argv) 107 int argc; 108 char **argv; 109{ 110 int c, n; 111 long status = 0; 112 113 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r'; 114top: 115 while ((c = getopt(argc, argv, "p:sx")) != EOF) 116 switch(c) { 117 case 'p': /* set prompt */ 118 prompt = optarg; 119 break; 120 case 's': /* run script */ 121 scripted = 1; 122 break; 123 case 'x': /* use crypt */ 124#ifdef DES 125 des = get_keyword(); 126#else 127 fprintf(stderr, "crypt unavailable\n?\n"); 128#endif 129 break; 130 131 default: 132 fprintf(stderr, usage, argv[0]); 133 exit(1); 134 } 135 argv += optind; 136 argc -= optind; 137 if (argc && **argv == '-') { 138 scripted = 1; 139 if (argc > 1) { 140 optind = 1; 141 goto top; 142 } 143 argv++; 144 argc--; 145 } 146 /* assert: reliable signals! */ 147#ifdef SIGWINCH 148 handle_winch(SIGWINCH); 149 if (isatty(0)) signal(SIGWINCH, handle_winch); 150#endif 151 signal(SIGHUP, signal_hup); 152 signal(SIGQUIT, SIG_IGN); 153 signal(SIGINT, signal_int); 154#ifdef _POSIX_SOURCE 155 if (status = sigsetjmp(env, 1)) 156#else 157 if (status = setjmp(env)) 158#endif 159 { 160 fputs("\n?\n", stderr); 161 sprintf(errmsg, "interrupt"); 162 } else { 163 init_buffers(); 164 sigactive = 1; /* enable signal handlers */ 165 if (argc && **argv && is_legal_filename(*argv)) { 166 if (read_file(*argv, 0) < 0 && !isatty(0)) 167 quit(2); 168 else if (**argv != '!') 169 strcpy(old_filename, *argv); 170 } else if (argc) { 171 fputs("?\n", stderr); 172 if (**argv == '\0') 173 sprintf(errmsg, "invalid filename"); 174 if (!isatty(0)) 175 quit(2); 176 } 177 } 178 for (;;) { 179 if (status < 0 && garrulous) 180 fprintf(stderr, "%s\n", errmsg); 181 if (prompt) { 182 printf("%s", prompt); 183 fflush(stdout); 184 } 185 if ((n = get_tty_line()) < 0) { 186 status = ERR; 187 continue; 188 } else if (n == 0) { 189 if (modified && !scripted) { 190 fputs("?\n", stderr); 191 sprintf(errmsg, "warning: file modified"); 192 if (!isatty(0)) { 193 fprintf(stderr, garrulous ? 194 "script, line %d: %s\n" : 195 "", lineno, errmsg); 196 quit(2); 197 } 198 clearerr(stdin); 199 modified = 0; 200 status = EMOD; 201 continue; 202 } else 203 quit(0); 204 } else if (ibuf[n - 1] != '\n') { 205 /* discard line */ 206 sprintf(errmsg, "unexpected end-of-file"); 207 clearerr(stdin); 208 status = ERR; 209 continue; 210 } 211 isglobal = 0; 212 if ((status = extract_addr_range()) >= 0 && 213 (status = exec_command()) >= 0) 214 if (!status || status && 215 (status = display_lines(current_addr, current_addr, 216 status)) >= 0) 217 continue; 218 switch (status) { 219 case EOF: 220 quit(0); 221 case EMOD: 222 modified = 0; 223 fputs("?\n", stderr); /* give warning */ 224 sprintf(errmsg, "warning: file modified"); 225 if (!isatty(0)) { 226 fprintf(stderr, garrulous ? 227 "script, line %d: %s\n" : 228 "", lineno, errmsg); 229 quit(2); 230 } 231 break; 232 case FATAL: 233 if (!isatty(0)) 234 fprintf(stderr, garrulous ? 235 "script, line %d: %s\n" : "", 236 lineno, errmsg); 237 else 238 fprintf(stderr, garrulous ? "%s\n" : "", 239 errmsg); 240 quit(3); 241 default: 242 fputs("?\n", stderr); 243 if (!isatty(0)) { 244 fprintf(stderr, garrulous ? 245 "script, line %d: %s\n" : "", 246 lineno, errmsg); 247 quit(2); 248 } 249 break; 250 } 251 } 252 /*NOTREACHED*/ 253} 254 255long first_addr, second_addr, addr_cnt; 256 257/* extract_addr_range: get line addresses from the command buffer until an 258 illegal address is seen; return status */ 259int 260extract_addr_range() 261{ 262 long addr; 263 264 addr_cnt = 0; 265 first_addr = second_addr = current_addr; 266 while ((addr = next_addr()) >= 0) { 267 addr_cnt++; 268 first_addr = second_addr; 269 second_addr = addr; 270 if (*ibufp != ',' && *ibufp != ';') 271 break; 272 else if (*ibufp++ == ';') 273 current_addr = addr; 274 } 275 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr) 276 first_addr = second_addr; 277 return (addr == ERR) ? ERR : 0; 278} 279 280 281#define SKIP_BLANKS() while (isspace(*ibufp) && *ibufp != '\n') ibufp++ 282 283#define MUST_BE_FIRST() \ 284 if (!first) { sprintf(errmsg, "invalid address"); return ERR; } 285 286/* next_addr: return the next line address in the command buffer */ 287long 288next_addr() 289{ 290 char *hd; 291 long addr = current_addr; 292 long n; 293 int first = 1; 294 int c; 295 296 SKIP_BLANKS(); 297 for (hd = ibufp;; first = 0) 298 switch (c = *ibufp) { 299 case '+': 300 case '\t': 301 case ' ': 302 case '-': 303 case '^': 304 ibufp++; 305 SKIP_BLANKS(); 306 if (isdigit(*ibufp)) { 307 STRTOL(n, ibufp); 308 addr += (c == '-' || c == '^') ? -n : n; 309 } else if (!isspace(c)) 310 addr += (c == '-' || c == '^') ? -1 : 1; 311 break; 312 case '0': case '1': case '2': 313 case '3': case '4': case '5': 314 case '6': case '7': case '8': case '9': 315 MUST_BE_FIRST(); 316 STRTOL(addr, ibufp); 317 break; 318 case '.': 319 case '$': 320 MUST_BE_FIRST(); 321 ibufp++; 322 addr = (c == '.') ? current_addr : addr_last; 323 break; 324 case '/': 325 case '?': 326 MUST_BE_FIRST(); 327 if ((addr = get_matching_node_addr( 328 get_compiled_pattern(), c == '/')) < 0) 329 return ERR; 330 else if (c == *ibufp) 331 ibufp++; 332 break; 333 case '\'': 334 MUST_BE_FIRST(); 335 ibufp++; 336 if ((addr = get_marked_node_addr(*ibufp++)) < 0) 337 return ERR; 338 break; 339 case '%': 340 case ',': 341 case ';': 342 if (first) { 343 ibufp++; 344 addr_cnt++; 345 second_addr = (c == ';') ? current_addr : 1; 346 addr = addr_last; 347 break; 348 } 349 /* FALL THROUGH */ 350 default: 351 if (ibufp == hd) 352 return EOF; 353 else if (addr < 0 || addr_last < addr) { 354 sprintf(errmsg, "invalid address"); 355 return ERR; 356 } else 357 return addr; 358 } 359 /* NOTREACHED */ 360} 361 362 363#ifdef BACKWARDS 364/* GET_THIRD_ADDR: get a legal address from the command buffer */ 365#define GET_THIRD_ADDR(addr) \ 366{ \ 367 long ol1, ol2; \ 368\ 369 ol1 = first_addr, ol2 = second_addr; \ 370 if (extract_addr_range() < 0) \ 371 return ERR; \ 372 else if (addr_cnt == 0) { \ 373 sprintf(errmsg, "destination expected"); \ 374 return ERR; \ 375 } else if (second_addr < 0 || addr_last < second_addr) { \ 376 sprintf(errmsg, "invalid address"); \ 377 return ERR; \ 378 } \ 379 addr = second_addr; \ 380 first_addr = ol1, second_addr = ol2; \ 381} 382#else /* BACKWARDS */ 383/* GET_THIRD_ADDR: get a legal address from the command buffer */ 384#define GET_THIRD_ADDR(addr) \ 385{ \ 386 long ol1, ol2; \ 387\ 388 ol1 = first_addr, ol2 = second_addr; \ 389 if (extract_addr_range() < 0) \ 390 return ERR; \ 391 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#endif 399 400 401/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */ 402#define GET_COMMAND_SUFFIX() { \ 403 int done = 0; \ 404 do { \ 405 switch(*ibufp) { \ 406 case 'p': \ 407 gflag |= GPR, ibufp++; \ 408 break; \ 409 case 'l': \ 410 gflag |= GLS, ibufp++; \ 411 break; \ 412 case 'n': \ 413 gflag |= GNP, ibufp++; \ 414 break; \ 415 default: \ 416 done++; \ 417 } \ 418 } while (!done); \ 419 if (*ibufp++ != '\n') { \ 420 sprintf(errmsg, "invalid command suffix"); \ 421 return ERR; \ 422 } \ 423} 424 425 426/* sflags */ 427#define SGG 001 /* complement previous global substitute suffix */ 428#define SGP 002 /* complement previous print suffix */ 429#define SGR 004 /* use last regex instead of last pat */ 430#define SGF 010 /* repeat last substitution */ 431 432int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */ 433 434long rows = 22; /* scroll length: ws_row - 2 */ 435 436/* exec_command: execute the next command in command buffer; return print 437 request, if any */ 438int 439exec_command() 440{ 441 extern long u_current_addr; 442 extern long u_addr_last; 443 444 static pattern_t *pat = NULL; 445 static int sgflag = 0; 446 static int sgnum = 0; 447 448 pattern_t *tpat; 449 char *fnp; 450 int gflag = 0; 451 int sflags = 0; 452 long addr = 0; 453 int n = 0; 454 int c; 455 456 SKIP_BLANKS(); 457 switch(c = *ibufp++) { 458 case 'a': 459 GET_COMMAND_SUFFIX(); 460 if (!isglobal) clear_undo_stack(); 461 if (append_lines(second_addr) < 0) 462 return ERR; 463 break; 464 case 'c': 465 if (check_addr_range(current_addr, current_addr) < 0) 466 return ERR; 467 GET_COMMAND_SUFFIX(); 468 if (!isglobal) clear_undo_stack(); 469 if (delete_lines(first_addr, second_addr) < 0 || 470 append_lines(current_addr) < 0) 471 return ERR; 472 break; 473 case 'd': 474 if (check_addr_range(current_addr, current_addr) < 0) 475 return ERR; 476 GET_COMMAND_SUFFIX(); 477 if (!isglobal) clear_undo_stack(); 478 if (delete_lines(first_addr, second_addr) < 0) 479 return ERR; 480 else if ((addr = INC_MOD(current_addr, addr_last)) != 0) 481 current_addr = addr; 482 break; 483 case 'e': 484 if (modified && !scripted) 485 return EMOD; 486 /* fall through */ 487 case 'E': 488 if (addr_cnt > 0) { 489 sprintf(errmsg, "unexpected address"); 490 return ERR; 491 } else if (!isspace(*ibufp)) { 492 sprintf(errmsg, "unexpected command suffix"); 493 return ERR; 494 } else if ((fnp = get_filename()) == NULL) 495 return ERR; 496 GET_COMMAND_SUFFIX(); 497 if (delete_lines(1, addr_last) < 0) 498 return ERR; 499 clear_undo_stack(); 500 if (close_sbuf() < 0) 501 return ERR; 502 else if (open_sbuf() < 0) 503 return FATAL; 504 if (*fnp && *fnp != '!') strcpy(old_filename, fnp); 505#ifdef BACKWARDS 506 if (*fnp == '\0' && *old_filename == '\0') { 507 sprintf(errmsg, "no current filename"); 508 return ERR; 509 } 510#endif 511 if (read_file(*fnp ? fnp : old_filename, 0) < 0) 512 return ERR; 513 clear_undo_stack(); 514 modified = 0; 515 u_current_addr = u_addr_last = -1; 516 break; 517 case 'f': 518 if (addr_cnt > 0) { 519 sprintf(errmsg, "unexpected address"); 520 return ERR; 521 } else if (!isspace(*ibufp)) { 522 sprintf(errmsg, "unexpected command suffix"); 523 return ERR; 524 } else if ((fnp = get_filename()) == NULL) 525 return ERR; 526 else if (*fnp == '!') { 527 sprintf(errmsg, "invalid redirection"); 528 return ERR; 529 } 530 GET_COMMAND_SUFFIX(); 531 if (*fnp) strcpy(old_filename, fnp); 532 printf("%s\n", strip_escapes(old_filename)); 533 break; 534 case 'g': 535 case 'v': 536 case 'G': 537 case 'V': 538 if (isglobal) { 539 sprintf(errmsg, "cannot nest global commands"); 540 return ERR; 541 } else if (check_addr_range(1, addr_last) < 0) 542 return ERR; 543 else if (build_active_list(c == 'g' || c == 'G') < 0) 544 return ERR; 545 else if (n = (c == 'G' || c == 'V')) 546 GET_COMMAND_SUFFIX(); 547 isglobal++; 548 if (exec_global(n, gflag) < 0) 549 return ERR; 550 break; 551 case 'h': 552 if (addr_cnt > 0) { 553 sprintf(errmsg, "unexpected address"); 554 return ERR; 555 } 556 GET_COMMAND_SUFFIX(); 557 if (*errmsg) fprintf(stderr, "%s\n", errmsg); 558 break; 559 case 'H': 560 if (addr_cnt > 0) { 561 sprintf(errmsg, "unexpected address"); 562 return ERR; 563 } 564 GET_COMMAND_SUFFIX(); 565 if ((garrulous = 1 - garrulous) && *errmsg) 566 fprintf(stderr, "%s\n", errmsg); 567 break; 568 case 'i': 569 if (second_addr == 0) { 570 sprintf(errmsg, "invalid address"); 571 return ERR; 572 } 573 GET_COMMAND_SUFFIX(); 574 if (!isglobal) clear_undo_stack(); 575 if (append_lines(second_addr - 1) < 0) 576 return ERR; 577 break; 578 case 'j': 579 if (check_addr_range(current_addr, current_addr + 1) < 0) 580 return ERR; 581 GET_COMMAND_SUFFIX(); 582 if (!isglobal) clear_undo_stack(); 583 if (first_addr != second_addr && 584 join_lines(first_addr, second_addr) < 0) 585 return ERR; 586 break; 587 case 'k': 588 c = *ibufp++; 589 if (second_addr == 0) { 590 sprintf(errmsg, "invalid address"); 591 return ERR; 592 } 593 GET_COMMAND_SUFFIX(); 594 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0) 595 return ERR; 596 break; 597 case 'l': 598 if (check_addr_range(current_addr, current_addr) < 0) 599 return ERR; 600 GET_COMMAND_SUFFIX(); 601 if (display_lines(first_addr, second_addr, gflag | GLS) < 0) 602 return ERR; 603 gflag = 0; 604 break; 605 case 'm': 606 if (check_addr_range(current_addr, current_addr) < 0) 607 return ERR; 608 GET_THIRD_ADDR(addr); 609 if (first_addr <= addr && addr < second_addr) { 610 sprintf(errmsg, "invalid destination"); 611 return ERR; 612 } 613 GET_COMMAND_SUFFIX(); 614 if (!isglobal) clear_undo_stack(); 615 if (move_lines(addr) < 0) 616 return ERR; 617 break; 618 case 'n': 619 if (check_addr_range(current_addr, current_addr) < 0) 620 return ERR; 621 GET_COMMAND_SUFFIX(); 622 if (display_lines(first_addr, second_addr, gflag | GNP) < 0) 623 return ERR; 624 gflag = 0; 625 break; 626 case 'p': 627 if (check_addr_range(current_addr, current_addr) < 0) 628 return ERR; 629 GET_COMMAND_SUFFIX(); 630 if (display_lines(first_addr, second_addr, gflag | GPR) < 0) 631 return ERR; 632 gflag = 0; 633 break; 634 case 'P': 635 if (addr_cnt > 0) { 636 sprintf(errmsg, "unexpected address"); 637 return ERR; 638 } 639 GET_COMMAND_SUFFIX(); 640 prompt = prompt ? NULL : optarg ? optarg : dps; 641 break; 642 case 'q': 643 case 'Q': 644 if (addr_cnt > 0) { 645 sprintf(errmsg, "unexpected address"); 646 return ERR; 647 } 648 GET_COMMAND_SUFFIX(); 649 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF; 650 break; 651 case 'r': 652 if (!isspace(*ibufp)) { 653 sprintf(errmsg, "unexpected command suffix"); 654 return ERR; 655 } else if (addr_cnt == 0) 656 second_addr = addr_last; 657 if ((fnp = get_filename()) == NULL) 658 return ERR; 659 GET_COMMAND_SUFFIX(); 660 if (!isglobal) clear_undo_stack(); 661 if (*old_filename == '\0' && *fnp != '!') 662 strcpy(old_filename, fnp); 663#ifdef BACKWARDS 664 if (*fnp == '\0' && *old_filename == '\0') { 665 sprintf(errmsg, "no current filename"); 666 return ERR; 667 } 668#endif 669 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0) 670 return ERR; 671 else if (addr && addr != addr_last) 672 modified = 1; 673 break; 674 case 's': 675 do { 676 switch(*ibufp) { 677 case '\n': 678 sflags |=SGF; 679 break; 680 case 'g': 681 sflags |= SGG; 682 ibufp++; 683 break; 684 case 'p': 685 sflags |= SGP; 686 ibufp++; 687 break; 688 case 'r': 689 sflags |= SGR; 690 ibufp++; 691 break; 692 case '0': case '1': case '2': case '3': case '4': 693 case '5': case '6': case '7': case '8': case '9': 694 STRTOL(sgnum, ibufp); 695 sflags |= SGF; 696 sgflag &= ~GSG; /* override GSG */ 697 break; 698 default: 699 if (sflags) { 700 sprintf(errmsg, "invalid command suffix"); 701 return ERR; 702 } 703 } 704 } while (sflags && *ibufp != '\n'); 705 if (sflags && !pat) { 706 sprintf(errmsg, "no previous substitution"); 707 return ERR; 708 } else if (sflags & SGG) 709 sgnum = 0; /* override numeric arg */ 710 if (*ibufp != '\n' && *(ibufp + 1) == '\n') { 711 sprintf(errmsg, "invalid pattern delimiter"); 712 return ERR; 713 } 714 tpat = pat; 715 SPL1(); 716 if ((!sflags || (sflags & SGR)) && 717 (tpat = get_compiled_pattern()) == NULL) { 718 SPL0(); 719 return ERR; 720 } else if (tpat != pat) { 721 if (pat) { 722 regfree(pat); 723 free(pat); 724 } 725 pat = tpat; 726 patlock = 1; /* reserve pattern */ 727 } 728 SPL0(); 729 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0) 730 return ERR; 731 else if (isglobal) 732 sgflag |= GLB; 733 else 734 sgflag &= ~GLB; 735 if (sflags & SGG) 736 sgflag ^= GSG; 737 if (sflags & SGP) 738 sgflag ^= GPR, sgflag &= ~(GLS | GNP); 739 do { 740 switch(*ibufp) { 741 case 'p': 742 sgflag |= GPR, ibufp++; 743 break; 744 case 'l': 745 sgflag |= GLS, ibufp++; 746 break; 747 case 'n': 748 sgflag |= GNP, ibufp++; 749 break; 750 default: 751 n++; 752 } 753 } while (!n); 754 if (check_addr_range(current_addr, current_addr) < 0) 755 return ERR; 756 GET_COMMAND_SUFFIX(); 757 if (!isglobal) clear_undo_stack(); 758 if (search_and_replace(pat, sgflag, sgnum) < 0) 759 return ERR; 760 break; 761 case 't': 762 if (check_addr_range(current_addr, current_addr) < 0) 763 return ERR; 764 GET_THIRD_ADDR(addr); 765 GET_COMMAND_SUFFIX(); 766 if (!isglobal) clear_undo_stack(); 767 if (copy_lines(addr) < 0) 768 return ERR; 769 break; 770 case 'u': 771 if (addr_cnt > 0) { 772 sprintf(errmsg, "unexpected address"); 773 return ERR; 774 } 775 GET_COMMAND_SUFFIX(); 776 if (pop_undo_stack() < 0) 777 return ERR; 778 break; 779 case 'w': 780 case 'W': 781 if ((n = *ibufp) == 'q' || n == 'Q') { 782 gflag = EOF; 783 ibufp++; 784 } 785 if (!isspace(*ibufp)) { 786 sprintf(errmsg, "unexpected command suffix"); 787 return ERR; 788 } else if ((fnp = get_filename()) == NULL) 789 return ERR; 790 if (addr_cnt == 0 && !addr_last) 791 first_addr = second_addr = 0; 792 else if (check_addr_range(1, addr_last) < 0) 793 return ERR; 794 GET_COMMAND_SUFFIX(); 795 if (*old_filename == '\0' && *fnp != '!') 796 strcpy(old_filename, fnp); 797#ifdef BACKWARDS 798 if (*fnp == '\0' && *old_filename == '\0') { 799 sprintf(errmsg, "no current filename"); 800 return ERR; 801 } 802#endif 803 if ((addr = write_file(*fnp ? fnp : old_filename, 804 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0) 805 return ERR; 806 else if (addr == addr_last) 807 modified = 0; 808 else if (modified && !scripted && n == 'q') 809 gflag = EMOD; 810 break; 811 case 'x': 812 if (addr_cnt > 0) { 813 sprintf(errmsg, "unexpected address"); 814 return ERR; 815 } 816 GET_COMMAND_SUFFIX(); 817#ifdef DES 818 des = get_keyword(); 819#else 820 sprintf(errmsg, "crypt unavailable"); 821 return ERR; 822#endif 823 break; 824 case 'z': 825#ifdef BACKWARDS 826 if (check_addr_range(first_addr = 1, current_addr + 1) < 0) 827#else 828 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0) 829#endif 830 return ERR; 831 else if ('0' < *ibufp && *ibufp <= '9') 832 STRTOL(rows, ibufp); 833 GET_COMMAND_SUFFIX(); 834 if (display_lines(second_addr, min(addr_last, 835 second_addr + rows), gflag) < 0) 836 return ERR; 837 gflag = 0; 838 break; 839 case '=': 840 GET_COMMAND_SUFFIX(); 841 printf("%d\n", addr_cnt ? second_addr : addr_last); 842 break; 843 case '!': 844 if (addr_cnt > 0) { 845 sprintf(errmsg, "unexpected address"); 846 return ERR; 847 } else if ((sflags = get_shell_command()) < 0) 848 return ERR; 849 GET_COMMAND_SUFFIX(); 850 if (sflags) printf("%s\n", shcmd + 1); 851 system(shcmd + 1); 852 if (!scripted) printf("!\n"); 853 break; 854 case '\n': 855#ifdef BACKWARDS 856 if (check_addr_range(first_addr = 1, current_addr + 1) < 0 857#else 858 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0 859#endif 860 || display_lines(second_addr, second_addr, 0) < 0) 861 return ERR; 862 break; 863 default: 864 sprintf(errmsg, "unknown command"); 865 return ERR; 866 } 867 return gflag; 868} 869 870 871/* check_addr_range: return status of address range check */ 872int 873check_addr_range(n, m) 874 long n, m; 875{ 876 if (addr_cnt == 0) { 877 first_addr = n; 878 second_addr = m; 879 } 880 if (first_addr > second_addr || 1 > first_addr || 881 second_addr > addr_last) { 882 sprintf(errmsg, "invalid address"); 883 return ERR; 884 } 885 return 0; 886} 887 888 889/* get_matching_node_addr: return the address of the next line matching a 890 pattern in a given direction. wrap around begin/end of editor buffer if 891 necessary */ 892long 893get_matching_node_addr(pat, dir) 894 pattern_t *pat; 895 int dir; 896{ 897 char *s; 898 long n = current_addr; 899 line_t *lp; 900 901 if (!pat) return ERR; 902 do { 903 if (n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last)) { 904 lp = get_addressed_line_node(n); 905 if ((s = get_sbuf_line(lp)) == NULL) 906 return ERR; 907 if (isbinary) 908 NUL_TO_NEWLINE(s, lp->len); 909 if (!regexec(pat, s, 0, NULL, 0)) 910 return n; 911 } 912 } while (n != current_addr); 913 sprintf(errmsg, "no match"); 914 return ERR; 915} 916 917 918/* get_filename: return pointer to copy of filename in the command buffer */ 919char * 920get_filename() 921{ 922 static char *file = NULL; 923 static int filesz = 0; 924 925 int n; 926 927 if (*ibufp != '\n') { 928 SKIP_BLANKS(); 929 if (*ibufp == '\n') { 930 sprintf(errmsg, "invalid filename"); 931 return NULL; 932 } else if ((ibufp = get_extended_line(&n, 1)) == NULL) 933 return NULL; 934 else if (*ibufp == '!') { 935 ibufp++; 936 if ((n = get_shell_command()) < 0) 937 return NULL; 938 if (n) printf("%s\n", shcmd + 1); 939 return shcmd; 940 } else if (n - 1 > MAXPATHLEN) { 941 sprintf(errmsg, "filename too long"); 942 return NULL; 943 } 944 } 945#ifndef BACKWARDS 946 else if (*old_filename == '\0') { 947 sprintf(errmsg, "no current filename"); 948 return NULL; 949 } 950#endif 951 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 952 for (n = 0; *ibufp != '\n';) 953 file[n++] = *ibufp++; 954 file[n] = '\0'; 955 return is_legal_filename(file) ? file : NULL; 956} 957 958 959/* get_shell_command: read a shell command from stdin; return substitution 960 status */ 961int 962get_shell_command() 963{ 964 static char *buf = NULL; 965 static int n = 0; 966 967 char *s; /* substitution char pointer */ 968 int i = 0; 969 int j = 0; 970 971 if (red) { 972 sprintf(errmsg, "shell access restricted"); 973 return ERR; 974 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL) 975 return ERR; 976 REALLOC(buf, n, j + 1, ERR); 977 buf[i++] = '!'; /* prefix command w/ bang */ 978 while (*ibufp != '\n') 979 switch (*ibufp) { 980 default: 981 REALLOC(buf, n, i + 2, ERR); 982 buf[i++] = *ibufp; 983 if (*ibufp++ == '\\') 984 buf[i++] = *ibufp++; 985 break; 986 case '!': 987 if (s != ibufp) { 988 REALLOC(buf, n, i + 1, ERR); 989 buf[i++] = *ibufp++; 990 } 991#ifdef BACKWARDS 992 else if (shcmd == NULL || *(shcmd + 1) == '\0') 993#else 994 else if (shcmd == NULL) 995#endif 996 { 997 sprintf(errmsg, "no previous command"); 998 return ERR; 999 } else { 1000 REALLOC(buf, n, i + shcmdi, ERR); 1001 for (s = shcmd + 1; s < shcmd + shcmdi;) 1002 buf[i++] = *s++; 1003 s = ibufp++; 1004 } 1005 break; 1006 case '%': 1007 if (*old_filename == '\0') { 1008 sprintf(errmsg, "no current filename"); 1009 return ERR; 1010 } 1011 j = strlen(s = strip_escapes(old_filename)); 1012 REALLOC(buf, n, i + j, ERR); 1013 while (j--) 1014 buf[i++] = *s++; 1015 s = ibufp++; 1016 break; 1017 } 1018 REALLOC(shcmd, shcmdsz, i + 1, ERR); 1019 memcpy(shcmd, buf, i); 1020 shcmd[shcmdi = i] = '\0'; 1021 return *s == '!' || *s == '%'; 1022} 1023 1024 1025/* append_lines: insert text from stdin to after line n; stop when either a 1026 single period is read or EOF; return status */ 1027int 1028append_lines(n) 1029 long n; 1030{ 1031 int l; 1032 char *lp = ibuf; 1033 char *eot; 1034 undo_t *up = NULL; 1035 1036 for (current_addr = n;;) { 1037 if (!isglobal) { 1038 if ((l = get_tty_line()) < 0) 1039 return ERR; 1040 else if (l == 0 || ibuf[l - 1] != '\n') { 1041 clearerr(stdin); 1042 return l ? EOF : 0; 1043 } 1044 lp = ibuf; 1045 } else if (*(lp = ibufp) == '\0') 1046 return 0; 1047 else { 1048 while (*ibufp++ != '\n') 1049 ; 1050 l = ibufp - lp; 1051 } 1052 if (l == 2 && lp[0] == '.' && lp[1] == '\n') { 1053 return 0; 1054 } 1055 eot = lp + l; 1056 SPL1(); 1057 do { 1058 if ((lp = put_sbuf_line(lp)) == NULL) { 1059 SPL0(); 1060 return ERR; 1061 } else if (up) 1062 up->t = get_addressed_line_node(current_addr); 1063 else if ((up = push_undo_stack(UADD, current_addr, 1064 current_addr)) == NULL) { 1065 SPL0(); 1066 return ERR; 1067 } 1068 } while (lp != eot); 1069 modified = 1; 1070 SPL0(); 1071 } 1072 /* NOTREACHED */ 1073} 1074 1075 1076/* join_lines: replace a range of lines with the joined text of those lines */ 1077int 1078join_lines(from, to) 1079 long from; 1080 long to; 1081{ 1082 static char *buf = NULL; 1083 static int n; 1084 1085 char *s; 1086 int size = 0; 1087 line_t *bp, *ep; 1088 1089 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1090 bp = get_addressed_line_node(from); 1091 for (; bp != ep; bp = bp->q_forw) { 1092 if ((s = get_sbuf_line(bp)) == NULL) 1093 return ERR; 1094 REALLOC(buf, n, size + bp->len, ERR); 1095 memcpy(buf + size, s, bp->len); 1096 size += bp->len; 1097 } 1098 REALLOC(buf, n, size + 2, ERR); 1099 memcpy(buf + size, "\n", 2); 1100 if (delete_lines(from, to) < 0) 1101 return ERR; 1102 current_addr = from - 1; 1103 SPL1(); 1104 if (put_sbuf_line(buf) == NULL || 1105 push_undo_stack(UADD, current_addr, current_addr) == NULL) { 1106 SPL0(); 1107 return ERR; 1108 } 1109 modified = 1; 1110 SPL0(); 1111 return 0; 1112} 1113 1114 1115/* move_lines: move a range of lines */ 1116int 1117move_lines(addr) 1118 long addr; 1119{ 1120 line_t *b1, *a1, *b2, *a2; 1121 long n = INC_MOD(second_addr, addr_last); 1122 long p = first_addr - 1; 1123 int done = (addr == first_addr - 1 || addr == second_addr); 1124 1125 SPL1(); 1126 if (done) { 1127 a2 = get_addressed_line_node(n); 1128 b2 = get_addressed_line_node(p); 1129 current_addr = second_addr; 1130 } else if (push_undo_stack(UMOV, p, n) == NULL || 1131 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) { 1132 SPL0(); 1133 return ERR; 1134 } else { 1135 a1 = get_addressed_line_node(n); 1136 if (addr < first_addr) { 1137 b1 = get_addressed_line_node(p); 1138 b2 = get_addressed_line_node(addr); 1139 /* this get_addressed_line_node last! */ 1140 } else { 1141 b2 = get_addressed_line_node(addr); 1142 b1 = get_addressed_line_node(p); 1143 /* this get_addressed_line_node last! */ 1144 } 1145 a2 = b2->q_forw; 1146 REQUE(b2, b1->q_forw); 1147 REQUE(a1->q_back, a2); 1148 REQUE(b1, a1); 1149 current_addr = addr + ((addr < first_addr) ? 1150 second_addr - first_addr + 1 : 0); 1151 } 1152 if (isglobal) 1153 unset_active_nodes(b2->q_forw, a2); 1154 modified = 1; 1155 SPL0(); 1156 return 0; 1157} 1158 1159 1160/* copy_lines: copy a range of lines; return status */ 1161int 1162copy_lines(addr) 1163 long addr; 1164{ 1165 line_t *lp, *np = get_addressed_line_node(first_addr); 1166 undo_t *up = NULL; 1167 long n = second_addr - first_addr + 1; 1168 long m = 0; 1169 1170 current_addr = addr; 1171 if (first_addr <= addr && addr < second_addr) { 1172 n = addr - first_addr + 1; 1173 m = second_addr - addr; 1174 } 1175 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1)) 1176 for (; n-- > 0; np = np->q_forw) { 1177 SPL1(); 1178 if ((lp = dup_line_node(np)) == NULL) { 1179 SPL0(); 1180 return ERR; 1181 } 1182 add_line_node(lp); 1183 if (up) 1184 up->t = lp; 1185 else if ((up = push_undo_stack(UADD, current_addr, 1186 current_addr)) == NULL) { 1187 SPL0(); 1188 return ERR; 1189 } 1190 modified = 1; 1191 SPL0(); 1192 } 1193 return 0; 1194} 1195 1196 1197/* delete_lines: delete a range of lines */ 1198int 1199delete_lines(from, to) 1200 long from, to; 1201{ 1202 line_t *n, *p; 1203 1204 SPL1(); 1205 if (push_undo_stack(UDEL, from, to) == NULL) { 1206 SPL0(); 1207 return ERR; 1208 } 1209 n = get_addressed_line_node(INC_MOD(to, addr_last)); 1210 p = get_addressed_line_node(from - 1); 1211 /* this get_addressed_line_node last! */ 1212 if (isglobal) 1213 unset_active_nodes(p->q_forw, n); 1214 REQUE(p, n); 1215 addr_last -= to - from + 1; 1216 current_addr = from - 1; 1217 modified = 1; 1218 SPL0(); 1219 return 0; 1220} 1221 1222 1223/* display_lines: print a range of lines to stdout */ 1224int 1225display_lines(from, to, gflag) 1226 long from; 1227 long to; 1228 int gflag; 1229{ 1230 line_t *bp; 1231 line_t *ep; 1232 char *s; 1233 1234 if (!from) { 1235 sprintf(errmsg, "invalid address"); 1236 return ERR; 1237 } 1238 ep = get_addressed_line_node(INC_MOD(to, addr_last)); 1239 bp = get_addressed_line_node(from); 1240 for (; bp != ep; bp = bp->q_forw) { 1241 if ((s = get_sbuf_line(bp)) == NULL) 1242 return ERR; 1243 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0) 1244 return ERR; 1245 } 1246 return 0; 1247} 1248 1249 1250#define MAXMARK 26 /* max number of marks */ 1251 1252line_t *mark[MAXMARK]; /* line markers */ 1253int markno; /* line marker count */ 1254 1255/* mark_line_node: set a line node mark */ 1256int 1257mark_line_node(lp, n) 1258 line_t *lp; 1259 int n; 1260{ 1261 if (!islower(n)) { 1262 sprintf(errmsg, "invalid mark character"); 1263 return ERR; 1264 } else if (mark[n - 'a'] == NULL) 1265 markno++; 1266 mark[n - 'a'] = lp; 1267 return 0; 1268} 1269 1270 1271/* get_marked_node_addr: return address of a marked line */ 1272long 1273get_marked_node_addr(n) 1274 int n; 1275{ 1276 if (!islower(n)) { 1277 sprintf(errmsg, "invalid mark character"); 1278 return ERR; 1279 } 1280 return get_line_node_addr(mark[n - 'a']); 1281} 1282 1283 1284/* unmark_line_node: clear line node mark */ 1285void 1286unmark_line_node(lp) 1287 line_t *lp; 1288{ 1289 int i; 1290 1291 for (i = 0; markno && i < MAXMARK; i++) 1292 if (mark[i] == lp) { 1293 mark[i] = NULL; 1294 markno--; 1295 } 1296} 1297 1298 1299/* dup_line_node: return a pointer to a copy of a line node */ 1300line_t * 1301dup_line_node(lp) 1302 line_t *lp; 1303{ 1304 line_t *np; 1305 1306 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) { 1307 fprintf(stderr, "%s\n", strerror(errno)); 1308 sprintf(errmsg, "out of memory"); 1309 return NULL; 1310 } 1311 np->seek = lp->seek; 1312 np->len = lp->len; 1313 return np; 1314} 1315 1316 1317/* has_trailing_escape: return the parity of escapes preceding a character 1318 in a string */ 1319int 1320has_trailing_escape(s, t) 1321 char *s; 1322 char *t; 1323{ 1324 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1); 1325} 1326 1327 1328/* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */ 1329char * 1330strip_escapes(s) 1331 char *s; 1332{ 1333 static char *file = NULL; 1334 static int filesz = 0; 1335 1336 int i = 0; 1337 1338 REALLOC(file, filesz, MAXPATHLEN + 1, NULL); 1339 /* assert: no trailing escape */ 1340 while (file[i++] = (*s == '\\') ? *++s : *s) 1341 s++; 1342 return file; 1343} 1344 1345 1346void 1347signal_hup(signo) 1348 int signo; 1349{ 1350 if (mutex) 1351 sigflags |= (1 << (signo - 1)); 1352 else handle_hup(signo); 1353} 1354 1355 1356void 1357signal_int(signo) 1358 int signo; 1359{ 1360 if (mutex) 1361 sigflags |= (1 << (signo - 1)); 1362 else handle_int(signo); 1363} 1364 1365 1366void 1367handle_hup(signo) 1368 int signo; 1369{ 1370 char *hup = NULL; /* hup filename */ 1371 char *s; 1372 int n; 1373 1374 if (!sigactive) 1375 quit(1); 1376 sigflags &= ~(1 << (signo - 1)); 1377 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 && 1378 (s = getenv("HOME")) != NULL && 1379 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */ 1380 (hup = (char *) malloc(n + 10)) != NULL) { 1381 strcpy(hup, s); 1382 if (hup[n - 1] != '/') 1383 hup[n] = '/', hup[n+1] = '\0'; 1384 strcat(hup, "ed.hup"); 1385 write_file(hup, "w", 1, addr_last); 1386 } 1387 quit(2); 1388} 1389 1390 1391void 1392handle_int(signo) 1393 int signo; 1394{ 1395 if (!sigactive) 1396 quit(1); 1397 sigflags &= ~(1 << (signo - 1)); 1398#ifdef _POSIX_SOURCE 1399 siglongjmp(env, -1); 1400#else 1401 longjmp(env, -1); 1402#endif 1403} 1404 1405 1406int cols = 72; /* wrap column */ 1407 1408void 1409handle_winch(signo) 1410 int signo; 1411{ 1412 struct winsize ws; /* window size structure */ 1413 1414 sigflags &= ~(1 << (signo - 1)); 1415 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) { 1416 if (ws.ws_row > 2) rows = ws.ws_row - 2; 1417 if (ws.ws_col > 8) cols = ws.ws_col - 8; 1418 } 1419} 1420 1421 1422/* is_legal_filename: return a legal filename */ 1423int 1424is_legal_filename(s) 1425 char *s; 1426{ 1427 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) { 1428 sprintf(errmsg, "shell access restricted"); 1429 return 0; 1430 } 1431 return 1; 1432} 1433