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 69247 2000-11-27 06:26:48Z kris $";
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/types.h>
61
62#include <sys/ioctl.h>
63#include <sys/wait.h>
64#include <ctype.h>
65#include <locale.h>
66#include <pwd.h>
67#include <setjmp.h>
68
69#include "ed.h"
70
71
72#ifdef _POSIX_SOURCE
73sigjmp_buf env;
74#else
75jmp_buf env;
76#endif
77
78/* static buffers */
79char stdinbuf[1]; /* stdin buffer */
80char *shcmd; /* shell command buffer */
81int shcmdsz; /* shell command buffer size */
82int shcmdi; /* shell command buffer index */
83char *ibuf; /* ed command-line buffer */
84int ibufsz; /* ed command-line buffer size */
85char *ibufp; /* pointer to ed command-line buffer */
86
87/* global flags */
88int des = 0; /* if set, use crypt(3) for i/o */
89int garrulous = 0; /* if set, print all error messages */
90int isbinary; /* if set, buffer contains ASCII NULs */
91int isglobal; /* if set, doing a global command */
92int modified; /* if set, buffer modified since last write */
93int mutex = 0; /* if set, signals set "sigflags" */
94int red = 0; /* if set, restrict shell/directory access */
95int scripted = 0; /* if set, suppress diagnostics */
96int sigflags = 0; /* if set, signals received while mutex set */
97int sigactive = 0; /* if set, signal handlers are enabled */
98
99char old_filename[MAXPATHLEN + 1] = ""; /* default filename */
100long current_addr; /* current address in editor buffer */
101long addr_last; /* last address in editor buffer */
102int lineno; /* script line number */
103char *prompt; /* command-line prompt */
104char *dps = "*"; /* default command-line prompt */
105
106const char usage[] = "usage: %s [-] [-sx] [-p string] [name]\n";
107
108/* ed: line editor */
109int
110main(argc, argv)
111 int argc;
112 char **argv;
113{
114 int c, n;
115 long status = 0;
116#if __GNUC__
117 /* Avoid longjmp clobbering */
118 (void) &argc;
119 (void) &argv;
120#endif
121
122 (void)setlocale(LC_ALL, "");
123
124 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
125top:
126 while ((c = getopt(argc, argv, "p:sx")) != -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 default:
143 fprintf(stderr, usage, argv[0]);
144 exit(1);
145 }
146 argv += optind;
147 argc -= optind;
148 if (argc && **argv == '-') {
149 scripted = 1;
150 if (argc > 1) {
151 optind = 1;
152 goto top;
153 }
154 argv++;
155 argc--;
156 }
157 /* assert: reliable signals! */
158#ifdef SIGWINCH
159 handle_winch(SIGWINCH);
160 if (isatty(0)) signal(SIGWINCH, handle_winch);
161#endif
162 signal(SIGHUP, signal_hup);
163 signal(SIGQUIT, SIG_IGN);
164 signal(SIGINT, signal_int);
165#ifdef _POSIX_SOURCE
166 if ((status = sigsetjmp(env, 1)))
167#else
168 if ((status = setjmp(env)))
169#endif
170 {
171 fputs("\n?\n", stderr);
172 sprintf(errmsg, "interrupt");
173 } else {
174 init_buffers();
175 sigactive = 1; /* enable signal handlers */
176 if (argc && **argv && is_legal_filename(*argv)) {
177 if (read_file(*argv, 0) < 0 && !isatty(0))
178 quit(2);
179 else if (**argv != '!')
180 if (strlcpy(old_filename, *argv, sizeof(old_filename))
181 >= sizeof(old_filename))
182 quit(2);
183 } else if (argc) {
184 fputs("?\n", stderr);
185 if (**argv == '\0')
186 sprintf(errmsg, "invalid filename");
187 if (!isatty(0))
188 quit(2);
189 }
190 }
191 for (;;) {
192 if (status < 0 && garrulous)
193 fprintf(stderr, "%s\n", errmsg);
194 if (prompt) {
195 printf("%s", prompt);
196 fflush(stdout);
197 }
198 if ((n = get_tty_line()) < 0) {
199 status = ERR;
200 continue;
201 } else if (n == 0) {
202 if (modified && !scripted) {
203 fputs("?\n", stderr);
204 sprintf(errmsg, "warning: file modified");
205 if (!isatty(0)) {
206 fprintf(stderr, garrulous ?
207 "script, line %d: %s\n" :
208 "", lineno, errmsg);
209 quit(2);
210 }
211 clearerr(stdin);
212 modified = 0;
213 status = EMOD;
214 continue;
215 } else
216 quit(0);
217 } else if (ibuf[n - 1] != '\n') {
218 /* discard line */
219 sprintf(errmsg, "unexpected end-of-file");
220 clearerr(stdin);
221 status = ERR;
222 continue;
223 }
224 isglobal = 0;
225 if ((status = extract_addr_range()) >= 0 &&
226 (status = exec_command()) >= 0)
227 if (!status ||
228 (status = display_lines(current_addr, current_addr,
229 status)) >= 0)
230 continue;
231 switch (status) {
232 case EOF:
233 quit(0);
234 case EMOD:
235 modified = 0;
236 fputs("?\n", stderr); /* give warning */
237 sprintf(errmsg, "warning: file modified");
238 if (!isatty(0)) {
239 fprintf(stderr, garrulous ?
240 "script, line %d: %s\n" :
241 "", lineno, errmsg);
242 quit(2);
243 }
244 break;
245 case FATAL:
246 if (!isatty(0))
247 fprintf(stderr, garrulous ?
248 "script, line %d: %s\n" : "",
249 lineno, errmsg);
250 else
251 fprintf(stderr, garrulous ? "%s\n" : "",
252 errmsg);
253 quit(3);
254 default:
255 fputs("?\n", stderr);
256 if (!isatty(0)) {
257 fprintf(stderr, garrulous ?
258 "script, line %d: %s\n" : "",
259 lineno, errmsg);
260 quit(2);
261 }
262 break;
263 }
264 }
265 /*NOTREACHED*/
266}
267
268long first_addr, second_addr, addr_cnt;
269
270/* extract_addr_range: get line addresses from the command buffer until an
271 illegal address is seen; return status */
272int
273extract_addr_range()
274{
275 long addr;
276
277 addr_cnt = 0;
278 first_addr = second_addr = current_addr;
279 while ((addr = next_addr()) >= 0) {
280 addr_cnt++;
281 first_addr = second_addr;
282 second_addr = addr;
283 if (*ibufp != ',' && *ibufp != ';')
284 break;
285 else if (*ibufp++ == ';')
286 current_addr = addr;
287 }
288 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
289 first_addr = second_addr;
290 return (addr == ERR) ? ERR : 0;
291}
292
293
294#define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
295
296#define MUST_BE_FIRST() \
297 if (!first) { sprintf(errmsg, "invalid address"); return ERR; }
298
299/* next_addr: return the next line address in the command buffer */
300long
301next_addr()
302{
303 char *hd;
304 long addr = current_addr;
305 long n;
306 int first = 1;
307 int c;
308
309 SKIP_BLANKS();
310 for (hd = ibufp;; first = 0)
311 switch (c = *ibufp) {
312 case '+':
313 case '\t':
314 case ' ':
315 case '-':
316 case '^':
317 ibufp++;
318 SKIP_BLANKS();
319 if (isdigit((unsigned char)*ibufp)) {
320 STRTOL(n, ibufp);
321 addr += (c == '-' || c == '^') ? -n : n;
322 } else if (!isspace((unsigned char)c))
323 addr += (c == '-' || c == '^') ? -1 : 1;
324 break;
325 case '0': case '1': case '2':
326 case '3': case '4': case '5':
327 case '6': case '7': case '8': case '9':
328 MUST_BE_FIRST();
329 STRTOL(addr, ibufp);
330 break;
331 case '.':
332 case '$':
333 MUST_BE_FIRST();
334 ibufp++;
335 addr = (c == '.') ? current_addr : addr_last;
336 break;
337 case '/':
338 case '?':
339 MUST_BE_FIRST();
340 if ((addr = get_matching_node_addr(
341 get_compiled_pattern(), c == '/')) < 0)
342 return ERR;
343 else if (c == *ibufp)
344 ibufp++;
345 break;
346 case '\'':
347 MUST_BE_FIRST();
348 ibufp++;
349 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
350 return ERR;
351 break;
352 case '%':
353 case ',':
354 case ';':
355 if (first) {
356 ibufp++;
357 addr_cnt++;
358 second_addr = (c == ';') ? current_addr : 1;
359 addr = addr_last;
360 break;
361 }
362 /* FALL THROUGH */
363 default:
364 if (ibufp == hd)
365 return EOF;
366 else if (addr < 0 || addr_last < addr) {
367 sprintf(errmsg, "invalid address");
368 return ERR;
369 } else
370 return addr;
371 }
372 /* NOTREACHED */
373}
374
375
376#ifdef BACKWARDS
377/* GET_THIRD_ADDR: get a legal address from the command buffer */
378#define GET_THIRD_ADDR(addr) \
379{ \
380 long ol1, ol2; \
381\
382 ol1 = first_addr, ol2 = second_addr; \
383 if (extract_addr_range() < 0) \
384 return ERR; \
385 else if (addr_cnt == 0) { \
386 sprintf(errmsg, "destination expected"); \
387 return ERR; \
388 } else if (second_addr < 0 || addr_last < second_addr) { \
389 sprintf(errmsg, "invalid address"); \
390 return ERR; \
391 } \
392 addr = second_addr; \
393 first_addr = ol1, second_addr = ol2; \
394}
395#else /* BACKWARDS */
396/* GET_THIRD_ADDR: get a legal address from the command buffer */
397#define GET_THIRD_ADDR(addr) \
398{ \
399 long ol1, ol2; \
400\
401 ol1 = first_addr, ol2 = second_addr; \
402 if (extract_addr_range() < 0) \
403 return ERR; \
404 if (second_addr < 0 || addr_last < second_addr) { \
405 sprintf(errmsg, "invalid address"); \
406 return ERR; \
407 } \
408 addr = second_addr; \
409 first_addr = ol1, second_addr = ol2; \
410}
411#endif
412
413
414/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
415#define GET_COMMAND_SUFFIX() { \
416 int done = 0; \
417 do { \
418 switch(*ibufp) { \
419 case 'p': \
420 gflag |= GPR, ibufp++; \
421 break; \
422 case 'l': \
423 gflag |= GLS, ibufp++; \
424 break; \
425 case 'n': \
426 gflag |= GNP, ibufp++; \
427 break; \
428 default: \
429 done++; \
430 } \
431 } while (!done); \
432 if (*ibufp++ != '\n') { \
433 sprintf(errmsg, "invalid command suffix"); \
434 return ERR; \
435 } \
436}
437
438
439/* sflags */
440#define SGG 001 /* complement previous global substitute suffix */
441#define SGP 002 /* complement previous print suffix */
442#define SGR 004 /* use last regex instead of last pat */
443#define SGF 010 /* repeat last substitution */
444
445int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
446
447long rows = 22; /* scroll length: ws_row - 2 */
448
449/* exec_command: execute the next command in command buffer; return print
450 request, if any */
451int
452exec_command()
453{
454 extern long u_current_addr;
455 extern long u_addr_last;
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')))
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 */
885int
886check_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 */
905long
906get_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) : DEC_MOD(n, addr_last))) {
917 lp = get_addressed_line_node(n);
918 if ((s = get_sbuf_line(lp)) == NULL)
919 return ERR;
920 if (isbinary)
921 NUL_TO_NEWLINE(s, lp->len);
922 if (!regexec(pat, s, 0, NULL, 0))
923 return n;
924 }
925 } while (n != current_addr);
926 sprintf(errmsg, "no match");
927 return ERR;
928}
929
930
931/* get_filename: return pointer to copy of filename in the command buffer */
932char *
933get_filename()
934{
935 static char *file = NULL;
936 static int filesz = 0;
937
938 int n;
939
940 if (*ibufp != '\n') {
941 SKIP_BLANKS();
942 if (*ibufp == '\n') {
943 sprintf(errmsg, "invalid filename");
944 return NULL;
945 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
946 return NULL;
947 else if (*ibufp == '!') {
948 ibufp++;
949 if ((n = get_shell_command()) < 0)
950 return NULL;
951 if (n) printf("%s\n", shcmd + 1);
952 return shcmd;
953 } else if (n - 1 > MAXPATHLEN) {
954 sprintf(errmsg, "filename too long");
955 return NULL;
956 }
957 }
958#ifndef BACKWARDS
959 else if (*old_filename == '\0') {
960 sprintf(errmsg, "no current filename");
961 return NULL;
962 }
963#endif
964 REALLOC(file, filesz, MAXPATHLEN + 1, NULL);
965 for (n = 0; *ibufp != '\n';)
966 file[n++] = *ibufp++;
967 file[n] = '\0';
968 return is_legal_filename(file) ? file : NULL;
969}
970
971
972/* get_shell_command: read a shell command from stdin; return substitution
973 status */
974int
975get_shell_command()
976{
977 static char *buf = NULL;
978 static int n = 0;
979
980 char *s; /* substitution char pointer */
981 int i = 0;
982 int j = 0;
983
984 if (red) {
985 sprintf(errmsg, "shell access restricted");
986 return ERR;
987 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
988 return ERR;
989 REALLOC(buf, n, j + 1, ERR);
990 buf[i++] = '!'; /* prefix command w/ bang */
991 while (*ibufp != '\n')
992 switch (*ibufp) {
993 default:
994 REALLOC(buf, n, i + 2, ERR);
995 buf[i++] = *ibufp;
996 if (*ibufp++ == '\\')
997 buf[i++] = *ibufp++;
998 break;
999 case '!':
1000 if (s != ibufp) {
1001 REALLOC(buf, n, i + 1, ERR);
1002 buf[i++] = *ibufp++;
1003 }
1004#ifdef BACKWARDS
1005 else if (shcmd == NULL || *(shcmd + 1) == '\0')
1006#else
1007 else if (shcmd == NULL)
1008#endif
1009 {
1010 sprintf(errmsg, "no previous command");
1011 return ERR;
1012 } else {
1013 REALLOC(buf, n, i + shcmdi, ERR);
1014 for (s = shcmd + 1; s < shcmd + shcmdi;)
1015 buf[i++] = *s++;
1016 s = ibufp++;
1017 }
1018 break;
1019 case '%':
1020 if (*old_filename == '\0') {
1021 sprintf(errmsg, "no current filename");
1022 return ERR;
1023 }
1024 j = strlen(s = strip_escapes(old_filename));
1025 REALLOC(buf, n, i + j, ERR);
1026 while (j--)
1027 buf[i++] = *s++;
1028 s = ibufp++;
1029 break;
1030 }
1031 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1032 memcpy(shcmd, buf, i);
1033 shcmd[shcmdi = i] = '\0';
1034 return *s == '!' || *s == '%';
1035}
1036
1037
1038/* append_lines: insert text from stdin to after line n; stop when either a
1039 single period is read or EOF; return status */
1040int
1041append_lines(n)
1042 long n;
1043{
1044 int l;
1045 char *lp = ibuf;
1046 char *eot;
1047 undo_t *up = NULL;
1048
1049 for (current_addr = n;;) {
1050 if (!isglobal) {
1051 if ((l = get_tty_line()) < 0)
1052 return ERR;
1053 else if (l == 0 || ibuf[l - 1] != '\n') {
1054 clearerr(stdin);
1055 return l ? EOF : 0;
1056 }
1057 lp = ibuf;
1058 } else if (*(lp = ibufp) == '\0')
1059 return 0;
1060 else {
1061 while (*ibufp++ != '\n')
1062 ;
1063 l = ibufp - lp;
1064 }
1065 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1066 return 0;
1067 }
1068 eot = lp + l;
1069 SPL1();
1070 do {
1071 if ((lp = put_sbuf_line(lp)) == NULL) {
1072 SPL0();
1073 return ERR;
1074 } else if (up)
1075 up->t = get_addressed_line_node(current_addr);
1076 else if ((up = push_undo_stack(UADD, current_addr,
1077 current_addr)) == NULL) {
1078 SPL0();
1079 return ERR;
1080 }
1081 } while (lp != eot);
1082 modified = 1;
1083 SPL0();
1084 }
1085 /* NOTREACHED */
1086}
1087
1088
1089/* join_lines: replace a range of lines with the joined text of those lines */
1090int
1091join_lines(from, to)
1092 long from;
1093 long to;
1094{
1095 static char *buf = NULL;
1096 static int n;
1097
1098 char *s;
1099 int size = 0;
1100 line_t *bp, *ep;
1101
1102 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1103 bp = get_addressed_line_node(from);
1104 for (; bp != ep; bp = bp->q_forw) {
1105 if ((s = get_sbuf_line(bp)) == NULL)
1106 return ERR;
1107 REALLOC(buf, n, size + bp->len, ERR);
1108 memcpy(buf + size, s, bp->len);
1109 size += bp->len;
1110 }
1111 REALLOC(buf, n, size + 2, ERR);
1112 memcpy(buf + size, "\n", 2);
1113 if (delete_lines(from, to) < 0)
1114 return ERR;
1115 current_addr = from - 1;
1116 SPL1();
1117 if (put_sbuf_line(buf) == NULL ||
1118 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1119 SPL0();
1120 return ERR;
1121 }
1122 modified = 1;
1123 SPL0();
1124 return 0;
1125}
1126
1127
1128/* move_lines: move a range of lines */
1129int
1130move_lines(addr)
1131 long addr;
1132{
1133 line_t *b1, *a1, *b2, *a2;
1134 long n = INC_MOD(second_addr, addr_last);
1135 long p = first_addr - 1;
1136 int done = (addr == first_addr - 1 || addr == second_addr);
1137
1138 SPL1();
1139 if (done) {
1140 a2 = get_addressed_line_node(n);
1141 b2 = get_addressed_line_node(p);
1142 current_addr = second_addr;
1143 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1144 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1145 SPL0();
1146 return ERR;
1147 } else {
1148 a1 = get_addressed_line_node(n);
1149 if (addr < first_addr) {
1150 b1 = get_addressed_line_node(p);
1151 b2 = get_addressed_line_node(addr);
1152 /* this get_addressed_line_node last! */
1153 } else {
1154 b2 = get_addressed_line_node(addr);
1155 b1 = get_addressed_line_node(p);
1156 /* this get_addressed_line_node last! */
1157 }
1158 a2 = b2->q_forw;
1159 REQUE(b2, b1->q_forw);
1160 REQUE(a1->q_back, a2);
1161 REQUE(b1, a1);
1162 current_addr = addr + ((addr < first_addr) ?
1163 second_addr - first_addr + 1 : 0);
1164 }
1165 if (isglobal)
1166 unset_active_nodes(b2->q_forw, a2);
1167 modified = 1;
1168 SPL0();
1169 return 0;
1170}
1171
1172
1173/* copy_lines: copy a range of lines; return status */
1174int
1175copy_lines(addr)
1176 long addr;
1177{
1178 line_t *lp, *np = get_addressed_line_node(first_addr);
1179 undo_t *up = NULL;
1180 long n = second_addr - first_addr + 1;
1181 long m = 0;
1182
1183 current_addr = addr;
1184 if (first_addr <= addr && addr < second_addr) {
1185 n = addr - first_addr + 1;
1186 m = second_addr - addr;
1187 }
1188 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1189 for (; n-- > 0; np = np->q_forw) {
1190 SPL1();
1191 if ((lp = dup_line_node(np)) == NULL) {
1192 SPL0();
1193 return ERR;
1194 }
1195 add_line_node(lp);
1196 if (up)
1197 up->t = lp;
1198 else if ((up = push_undo_stack(UADD, current_addr,
1199 current_addr)) == NULL) {
1200 SPL0();
1201 return ERR;
1202 }
1203 modified = 1;
1204 SPL0();
1205 }
1206 return 0;
1207}
1208
1209
1210/* delete_lines: delete a range of lines */
1211int
1212delete_lines(from, to)
1213 long from, to;
1214{
1215 line_t *n, *p;
1216
1217 SPL1();
1218 if (push_undo_stack(UDEL, from, to) == NULL) {
1219 SPL0();
1220 return ERR;
1221 }
1222 n = get_addressed_line_node(INC_MOD(to, addr_last));
1223 p = get_addressed_line_node(from - 1);
1224 /* this get_addressed_line_node last! */
1225 if (isglobal)
1226 unset_active_nodes(p->q_forw, n);
1227 REQUE(p, n);
1228 addr_last -= to - from + 1;
1229 current_addr = from - 1;
1230 modified = 1;
1231 SPL0();
1232 return 0;
1233}
1234
1235
1236/* display_lines: print a range of lines to stdout */
1237int
1238display_lines(from, to, gflag)
1239 long from;
1240 long to;
1241 int gflag;
1242{
1243 line_t *bp;
1244 line_t *ep;
1245 char *s;
1246
1247 if (!from) {
1248 sprintf(errmsg, "invalid address");
1249 return ERR;
1250 }
1251 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1252 bp = get_addressed_line_node(from);
1253 for (; bp != ep; bp = bp->q_forw) {
1254 if ((s = get_sbuf_line(bp)) == NULL)
1255 return ERR;
1256 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1257 return ERR;
1258 }
1259 return 0;
1260}
1261
1262
1263#define MAXMARK 26 /* max number of marks */
1264
1265line_t *mark[MAXMARK]; /* line markers */
1266int markno; /* line marker count */
1267
1268/* mark_line_node: set a line node mark */
1269int
1270mark_line_node(lp, n)
1271 line_t *lp;
1272 int n;
1273{
1274 if (!islower((unsigned char)n)) {
1275 sprintf(errmsg, "invalid mark character");
1276 return ERR;
1277 } else if (mark[n - 'a'] == NULL)
1278 markno++;
1279 mark[n - 'a'] = lp;
1280 return 0;
1281}
1282
1283
1284/* get_marked_node_addr: return address of a marked line */
1285long
1286get_marked_node_addr(n)
1287 int n;
1288{
1289 if (!islower((unsigned char)n)) {
1290 sprintf(errmsg, "invalid mark character");
1291 return ERR;
1292 }
1293 return get_line_node_addr(mark[n - 'a']);
1294}
1295
1296
1297/* unmark_line_node: clear line node mark */
1298void
1299unmark_line_node(lp)
1300 line_t *lp;
1301{
1302 int i;
1303
1304 for (i = 0; markno && i < MAXMARK; i++)
1305 if (mark[i] == lp) {
1306 mark[i] = NULL;
1307 markno--;
1308 }
1309}
1310
1311
1312/* dup_line_node: return a pointer to a copy of a line node */
1313line_t *
1314dup_line_node(lp)
1315 line_t *lp;
1316{
1317 line_t *np;
1318
1319 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1320 fprintf(stderr, "%s\n", strerror(errno));
1321 sprintf(errmsg, "out of memory");
1322 return NULL;
1323 }
1324 np->seek = lp->seek;
1325 np->len = lp->len;
1326 return np;
1327}
1328
1329
1330/* has_trailing_escape: return the parity of escapes preceding a character
1331 in a string */
1332int
1333has_trailing_escape(s, t)
1334 char *s;
1335 char *t;
1336{
1337 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1338}
1339
1340
1341/* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */
1342char *
1343strip_escapes(s)
1344 char *s;
1345{
1346 static char *file = NULL;
1347 static int filesz = 0;
1348
1349 int i = 0;
1350
1351 REALLOC(file, filesz, MAXPATHLEN + 1, NULL);
1352 while (i < filesz - 1 /* Worry about a possible trailing escape */
1353 && (file[i++] = (*s == '\\') ? *++s : *s))
1354 s++;
1355 return file;
1356}
1357
1358
1359void
1360signal_hup(signo)
1361 int signo;
1362{
1363 if (mutex)
1364 sigflags |= (1 << (signo - 1));
1365 else
1366 handle_hup(signo);
1367}
1368
1369
1370void
1371signal_int(signo)
1372 int signo;
1373{
1374 if (mutex)
1375 sigflags |= (1 << (signo - 1));
1376 else
1377 handle_int(signo);
1378}
1379
1380
1381void
1382handle_hup(signo)
1383 int signo;
1384{
1385 char *hup = NULL; /* hup filename */
1386 char *s;
1387 int n;
1388
1389 if (!sigactive)
1390 quit(1);
1391 sigflags &= ~(1 << (signo - 1));
1392 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 &&
1393 (s = getenv("HOME")) != NULL &&
1394 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */
1395 (hup = (char *) malloc(n + 10)) != NULL) {
1396 strcpy(hup, s);
1397 if (hup[n - 1] != '/')
1398 hup[n] = '/', hup[n+1] = '\0';
1399 strcat(hup, "ed.hup");
1400 write_file(hup, "w", 1, addr_last);
1401 }
1402 quit(2);
1403}
1404
1405
1406void
1407handle_int(signo)
1408 int signo;
1409{
1410 if (!sigactive)
1411 quit(1);
1412 sigflags &= ~(1 << (signo - 1));
1413#ifdef _POSIX_SOURCE
1414 siglongjmp(env, -1);
1415#else
1416 longjmp(env, -1);
1417#endif
1418}
1419
1420
1421int cols = 72; /* wrap column */
1422
1423void
1424handle_winch(signo)
1425 int signo;
1426{
1427 int save_errno = errno;
1428
1429 struct winsize ws; /* window size structure */
1430
1431 sigflags &= ~(1 << (signo - 1));
1432 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1433 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1434 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1435 }
1436 errno = save_errno;
1437}
1438
1439
1440/* is_legal_filename: return a legal filename */
1441int
1442is_legal_filename(s)
1443 char *s;
1444{
1445 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1446 sprintf(errmsg, "shell access restricted");
1447 return 0;
1448 }
1449 return 1;
1450}
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 69247 2000-11-27 06:26:48Z kris $";
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/types.h>
61
62#include <sys/ioctl.h>
63#include <sys/wait.h>
64#include <ctype.h>
65#include <locale.h>
66#include <pwd.h>
67#include <setjmp.h>
68
69#include "ed.h"
70
71
72#ifdef _POSIX_SOURCE
73sigjmp_buf env;
74#else
75jmp_buf env;
76#endif
77
78/* static buffers */
79char stdinbuf[1]; /* stdin buffer */
80char *shcmd; /* shell command buffer */
81int shcmdsz; /* shell command buffer size */
82int shcmdi; /* shell command buffer index */
83char *ibuf; /* ed command-line buffer */
84int ibufsz; /* ed command-line buffer size */
85char *ibufp; /* pointer to ed command-line buffer */
86
87/* global flags */
88int des = 0; /* if set, use crypt(3) for i/o */
89int garrulous = 0; /* if set, print all error messages */
90int isbinary; /* if set, buffer contains ASCII NULs */
91int isglobal; /* if set, doing a global command */
92int modified; /* if set, buffer modified since last write */
93int mutex = 0; /* if set, signals set "sigflags" */
94int red = 0; /* if set, restrict shell/directory access */
95int scripted = 0; /* if set, suppress diagnostics */
96int sigflags = 0; /* if set, signals received while mutex set */
97int sigactive = 0; /* if set, signal handlers are enabled */
98
99char old_filename[MAXPATHLEN + 1] = ""; /* default filename */
100long current_addr; /* current address in editor buffer */
101long addr_last; /* last address in editor buffer */
102int lineno; /* script line number */
103char *prompt; /* command-line prompt */
104char *dps = "*"; /* default command-line prompt */
105
106const char usage[] = "usage: %s [-] [-sx] [-p string] [name]\n";
107
108/* ed: line editor */
109int
110main(argc, argv)
111 int argc;
112 char **argv;
113{
114 int c, n;
115 long status = 0;
116#if __GNUC__
117 /* Avoid longjmp clobbering */
118 (void) &argc;
119 (void) &argv;
120#endif
121
122 (void)setlocale(LC_ALL, "");
123
124 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
125top:
126 while ((c = getopt(argc, argv, "p:sx")) != -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 default:
143 fprintf(stderr, usage, argv[0]);
144 exit(1);
145 }
146 argv += optind;
147 argc -= optind;
148 if (argc && **argv == '-') {
149 scripted = 1;
150 if (argc > 1) {
151 optind = 1;
152 goto top;
153 }
154 argv++;
155 argc--;
156 }
157 /* assert: reliable signals! */
158#ifdef SIGWINCH
159 handle_winch(SIGWINCH);
160 if (isatty(0)) signal(SIGWINCH, handle_winch);
161#endif
162 signal(SIGHUP, signal_hup);
163 signal(SIGQUIT, SIG_IGN);
164 signal(SIGINT, signal_int);
165#ifdef _POSIX_SOURCE
166 if ((status = sigsetjmp(env, 1)))
167#else
168 if ((status = setjmp(env)))
169#endif
170 {
171 fputs("\n?\n", stderr);
172 sprintf(errmsg, "interrupt");
173 } else {
174 init_buffers();
175 sigactive = 1; /* enable signal handlers */
176 if (argc && **argv && is_legal_filename(*argv)) {
177 if (read_file(*argv, 0) < 0 && !isatty(0))
178 quit(2);
179 else if (**argv != '!')
180 if (strlcpy(old_filename, *argv, sizeof(old_filename))
181 >= sizeof(old_filename))
182 quit(2);
183 } else if (argc) {
184 fputs("?\n", stderr);
185 if (**argv == '\0')
186 sprintf(errmsg, "invalid filename");
187 if (!isatty(0))
188 quit(2);
189 }
190 }
191 for (;;) {
192 if (status < 0 && garrulous)
193 fprintf(stderr, "%s\n", errmsg);
194 if (prompt) {
195 printf("%s", prompt);
196 fflush(stdout);
197 }
198 if ((n = get_tty_line()) < 0) {
199 status = ERR;
200 continue;
201 } else if (n == 0) {
202 if (modified && !scripted) {
203 fputs("?\n", stderr);
204 sprintf(errmsg, "warning: file modified");
205 if (!isatty(0)) {
206 fprintf(stderr, garrulous ?
207 "script, line %d: %s\n" :
208 "", lineno, errmsg);
209 quit(2);
210 }
211 clearerr(stdin);
212 modified = 0;
213 status = EMOD;
214 continue;
215 } else
216 quit(0);
217 } else if (ibuf[n - 1] != '\n') {
218 /* discard line */
219 sprintf(errmsg, "unexpected end-of-file");
220 clearerr(stdin);
221 status = ERR;
222 continue;
223 }
224 isglobal = 0;
225 if ((status = extract_addr_range()) >= 0 &&
226 (status = exec_command()) >= 0)
227 if (!status ||
228 (status = display_lines(current_addr, current_addr,
229 status)) >= 0)
230 continue;
231 switch (status) {
232 case EOF:
233 quit(0);
234 case EMOD:
235 modified = 0;
236 fputs("?\n", stderr); /* give warning */
237 sprintf(errmsg, "warning: file modified");
238 if (!isatty(0)) {
239 fprintf(stderr, garrulous ?
240 "script, line %d: %s\n" :
241 "", lineno, errmsg);
242 quit(2);
243 }
244 break;
245 case FATAL:
246 if (!isatty(0))
247 fprintf(stderr, garrulous ?
248 "script, line %d: %s\n" : "",
249 lineno, errmsg);
250 else
251 fprintf(stderr, garrulous ? "%s\n" : "",
252 errmsg);
253 quit(3);
254 default:
255 fputs("?\n", stderr);
256 if (!isatty(0)) {
257 fprintf(stderr, garrulous ?
258 "script, line %d: %s\n" : "",
259 lineno, errmsg);
260 quit(2);
261 }
262 break;
263 }
264 }
265 /*NOTREACHED*/
266}
267
268long first_addr, second_addr, addr_cnt;
269
270/* extract_addr_range: get line addresses from the command buffer until an
271 illegal address is seen; return status */
272int
273extract_addr_range()
274{
275 long addr;
276
277 addr_cnt = 0;
278 first_addr = second_addr = current_addr;
279 while ((addr = next_addr()) >= 0) {
280 addr_cnt++;
281 first_addr = second_addr;
282 second_addr = addr;
283 if (*ibufp != ',' && *ibufp != ';')
284 break;
285 else if (*ibufp++ == ';')
286 current_addr = addr;
287 }
288 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
289 first_addr = second_addr;
290 return (addr == ERR) ? ERR : 0;
291}
292
293
294#define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
295
296#define MUST_BE_FIRST() \
297 if (!first) { sprintf(errmsg, "invalid address"); return ERR; }
298
299/* next_addr: return the next line address in the command buffer */
300long
301next_addr()
302{
303 char *hd;
304 long addr = current_addr;
305 long n;
306 int first = 1;
307 int c;
308
309 SKIP_BLANKS();
310 for (hd = ibufp;; first = 0)
311 switch (c = *ibufp) {
312 case '+':
313 case '\t':
314 case ' ':
315 case '-':
316 case '^':
317 ibufp++;
318 SKIP_BLANKS();
319 if (isdigit((unsigned char)*ibufp)) {
320 STRTOL(n, ibufp);
321 addr += (c == '-' || c == '^') ? -n : n;
322 } else if (!isspace((unsigned char)c))
323 addr += (c == '-' || c == '^') ? -1 : 1;
324 break;
325 case '0': case '1': case '2':
326 case '3': case '4': case '5':
327 case '6': case '7': case '8': case '9':
328 MUST_BE_FIRST();
329 STRTOL(addr, ibufp);
330 break;
331 case '.':
332 case '$':
333 MUST_BE_FIRST();
334 ibufp++;
335 addr = (c == '.') ? current_addr : addr_last;
336 break;
337 case '/':
338 case '?':
339 MUST_BE_FIRST();
340 if ((addr = get_matching_node_addr(
341 get_compiled_pattern(), c == '/')) < 0)
342 return ERR;
343 else if (c == *ibufp)
344 ibufp++;
345 break;
346 case '\'':
347 MUST_BE_FIRST();
348 ibufp++;
349 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
350 return ERR;
351 break;
352 case '%':
353 case ',':
354 case ';':
355 if (first) {
356 ibufp++;
357 addr_cnt++;
358 second_addr = (c == ';') ? current_addr : 1;
359 addr = addr_last;
360 break;
361 }
362 /* FALL THROUGH */
363 default:
364 if (ibufp == hd)
365 return EOF;
366 else if (addr < 0 || addr_last < addr) {
367 sprintf(errmsg, "invalid address");
368 return ERR;
369 } else
370 return addr;
371 }
372 /* NOTREACHED */
373}
374
375
376#ifdef BACKWARDS
377/* GET_THIRD_ADDR: get a legal address from the command buffer */
378#define GET_THIRD_ADDR(addr) \
379{ \
380 long ol1, ol2; \
381\
382 ol1 = first_addr, ol2 = second_addr; \
383 if (extract_addr_range() < 0) \
384 return ERR; \
385 else if (addr_cnt == 0) { \
386 sprintf(errmsg, "destination expected"); \
387 return ERR; \
388 } else if (second_addr < 0 || addr_last < second_addr) { \
389 sprintf(errmsg, "invalid address"); \
390 return ERR; \
391 } \
392 addr = second_addr; \
393 first_addr = ol1, second_addr = ol2; \
394}
395#else /* BACKWARDS */
396/* GET_THIRD_ADDR: get a legal address from the command buffer */
397#define GET_THIRD_ADDR(addr) \
398{ \
399 long ol1, ol2; \
400\
401 ol1 = first_addr, ol2 = second_addr; \
402 if (extract_addr_range() < 0) \
403 return ERR; \
404 if (second_addr < 0 || addr_last < second_addr) { \
405 sprintf(errmsg, "invalid address"); \
406 return ERR; \
407 } \
408 addr = second_addr; \
409 first_addr = ol1, second_addr = ol2; \
410}
411#endif
412
413
414/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
415#define GET_COMMAND_SUFFIX() { \
416 int done = 0; \
417 do { \
418 switch(*ibufp) { \
419 case 'p': \
420 gflag |= GPR, ibufp++; \
421 break; \
422 case 'l': \
423 gflag |= GLS, ibufp++; \
424 break; \
425 case 'n': \
426 gflag |= GNP, ibufp++; \
427 break; \
428 default: \
429 done++; \
430 } \
431 } while (!done); \
432 if (*ibufp++ != '\n') { \
433 sprintf(errmsg, "invalid command suffix"); \
434 return ERR; \
435 } \
436}
437
438
439/* sflags */
440#define SGG 001 /* complement previous global substitute suffix */
441#define SGP 002 /* complement previous print suffix */
442#define SGR 004 /* use last regex instead of last pat */
443#define SGF 010 /* repeat last substitution */
444
445int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
446
447long rows = 22; /* scroll length: ws_row - 2 */
448
449/* exec_command: execute the next command in command buffer; return print
450 request, if any */
451int
452exec_command()
453{
454 extern long u_current_addr;
455 extern long u_addr_last;
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')))
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 */
885int
886check_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 */
905long
906get_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) : DEC_MOD(n, addr_last))) {
917 lp = get_addressed_line_node(n);
918 if ((s = get_sbuf_line(lp)) == NULL)
919 return ERR;
920 if (isbinary)
921 NUL_TO_NEWLINE(s, lp->len);
922 if (!regexec(pat, s, 0, NULL, 0))
923 return n;
924 }
925 } while (n != current_addr);
926 sprintf(errmsg, "no match");
927 return ERR;
928}
929
930
931/* get_filename: return pointer to copy of filename in the command buffer */
932char *
933get_filename()
934{
935 static char *file = NULL;
936 static int filesz = 0;
937
938 int n;
939
940 if (*ibufp != '\n') {
941 SKIP_BLANKS();
942 if (*ibufp == '\n') {
943 sprintf(errmsg, "invalid filename");
944 return NULL;
945 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
946 return NULL;
947 else if (*ibufp == '!') {
948 ibufp++;
949 if ((n = get_shell_command()) < 0)
950 return NULL;
951 if (n) printf("%s\n", shcmd + 1);
952 return shcmd;
953 } else if (n - 1 > MAXPATHLEN) {
954 sprintf(errmsg, "filename too long");
955 return NULL;
956 }
957 }
958#ifndef BACKWARDS
959 else if (*old_filename == '\0') {
960 sprintf(errmsg, "no current filename");
961 return NULL;
962 }
963#endif
964 REALLOC(file, filesz, MAXPATHLEN + 1, NULL);
965 for (n = 0; *ibufp != '\n';)
966 file[n++] = *ibufp++;
967 file[n] = '\0';
968 return is_legal_filename(file) ? file : NULL;
969}
970
971
972/* get_shell_command: read a shell command from stdin; return substitution
973 status */
974int
975get_shell_command()
976{
977 static char *buf = NULL;
978 static int n = 0;
979
980 char *s; /* substitution char pointer */
981 int i = 0;
982 int j = 0;
983
984 if (red) {
985 sprintf(errmsg, "shell access restricted");
986 return ERR;
987 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
988 return ERR;
989 REALLOC(buf, n, j + 1, ERR);
990 buf[i++] = '!'; /* prefix command w/ bang */
991 while (*ibufp != '\n')
992 switch (*ibufp) {
993 default:
994 REALLOC(buf, n, i + 2, ERR);
995 buf[i++] = *ibufp;
996 if (*ibufp++ == '\\')
997 buf[i++] = *ibufp++;
998 break;
999 case '!':
1000 if (s != ibufp) {
1001 REALLOC(buf, n, i + 1, ERR);
1002 buf[i++] = *ibufp++;
1003 }
1004#ifdef BACKWARDS
1005 else if (shcmd == NULL || *(shcmd + 1) == '\0')
1006#else
1007 else if (shcmd == NULL)
1008#endif
1009 {
1010 sprintf(errmsg, "no previous command");
1011 return ERR;
1012 } else {
1013 REALLOC(buf, n, i + shcmdi, ERR);
1014 for (s = shcmd + 1; s < shcmd + shcmdi;)
1015 buf[i++] = *s++;
1016 s = ibufp++;
1017 }
1018 break;
1019 case '%':
1020 if (*old_filename == '\0') {
1021 sprintf(errmsg, "no current filename");
1022 return ERR;
1023 }
1024 j = strlen(s = strip_escapes(old_filename));
1025 REALLOC(buf, n, i + j, ERR);
1026 while (j--)
1027 buf[i++] = *s++;
1028 s = ibufp++;
1029 break;
1030 }
1031 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1032 memcpy(shcmd, buf, i);
1033 shcmd[shcmdi = i] = '\0';
1034 return *s == '!' || *s == '%';
1035}
1036
1037
1038/* append_lines: insert text from stdin to after line n; stop when either a
1039 single period is read or EOF; return status */
1040int
1041append_lines(n)
1042 long n;
1043{
1044 int l;
1045 char *lp = ibuf;
1046 char *eot;
1047 undo_t *up = NULL;
1048
1049 for (current_addr = n;;) {
1050 if (!isglobal) {
1051 if ((l = get_tty_line()) < 0)
1052 return ERR;
1053 else if (l == 0 || ibuf[l - 1] != '\n') {
1054 clearerr(stdin);
1055 return l ? EOF : 0;
1056 }
1057 lp = ibuf;
1058 } else if (*(lp = ibufp) == '\0')
1059 return 0;
1060 else {
1061 while (*ibufp++ != '\n')
1062 ;
1063 l = ibufp - lp;
1064 }
1065 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1066 return 0;
1067 }
1068 eot = lp + l;
1069 SPL1();
1070 do {
1071 if ((lp = put_sbuf_line(lp)) == NULL) {
1072 SPL0();
1073 return ERR;
1074 } else if (up)
1075 up->t = get_addressed_line_node(current_addr);
1076 else if ((up = push_undo_stack(UADD, current_addr,
1077 current_addr)) == NULL) {
1078 SPL0();
1079 return ERR;
1080 }
1081 } while (lp != eot);
1082 modified = 1;
1083 SPL0();
1084 }
1085 /* NOTREACHED */
1086}
1087
1088
1089/* join_lines: replace a range of lines with the joined text of those lines */
1090int
1091join_lines(from, to)
1092 long from;
1093 long to;
1094{
1095 static char *buf = NULL;
1096 static int n;
1097
1098 char *s;
1099 int size = 0;
1100 line_t *bp, *ep;
1101
1102 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1103 bp = get_addressed_line_node(from);
1104 for (; bp != ep; bp = bp->q_forw) {
1105 if ((s = get_sbuf_line(bp)) == NULL)
1106 return ERR;
1107 REALLOC(buf, n, size + bp->len, ERR);
1108 memcpy(buf + size, s, bp->len);
1109 size += bp->len;
1110 }
1111 REALLOC(buf, n, size + 2, ERR);
1112 memcpy(buf + size, "\n", 2);
1113 if (delete_lines(from, to) < 0)
1114 return ERR;
1115 current_addr = from - 1;
1116 SPL1();
1117 if (put_sbuf_line(buf) == NULL ||
1118 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1119 SPL0();
1120 return ERR;
1121 }
1122 modified = 1;
1123 SPL0();
1124 return 0;
1125}
1126
1127
1128/* move_lines: move a range of lines */
1129int
1130move_lines(addr)
1131 long addr;
1132{
1133 line_t *b1, *a1, *b2, *a2;
1134 long n = INC_MOD(second_addr, addr_last);
1135 long p = first_addr - 1;
1136 int done = (addr == first_addr - 1 || addr == second_addr);
1137
1138 SPL1();
1139 if (done) {
1140 a2 = get_addressed_line_node(n);
1141 b2 = get_addressed_line_node(p);
1142 current_addr = second_addr;
1143 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1144 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1145 SPL0();
1146 return ERR;
1147 } else {
1148 a1 = get_addressed_line_node(n);
1149 if (addr < first_addr) {
1150 b1 = get_addressed_line_node(p);
1151 b2 = get_addressed_line_node(addr);
1152 /* this get_addressed_line_node last! */
1153 } else {
1154 b2 = get_addressed_line_node(addr);
1155 b1 = get_addressed_line_node(p);
1156 /* this get_addressed_line_node last! */
1157 }
1158 a2 = b2->q_forw;
1159 REQUE(b2, b1->q_forw);
1160 REQUE(a1->q_back, a2);
1161 REQUE(b1, a1);
1162 current_addr = addr + ((addr < first_addr) ?
1163 second_addr - first_addr + 1 : 0);
1164 }
1165 if (isglobal)
1166 unset_active_nodes(b2->q_forw, a2);
1167 modified = 1;
1168 SPL0();
1169 return 0;
1170}
1171
1172
1173/* copy_lines: copy a range of lines; return status */
1174int
1175copy_lines(addr)
1176 long addr;
1177{
1178 line_t *lp, *np = get_addressed_line_node(first_addr);
1179 undo_t *up = NULL;
1180 long n = second_addr - first_addr + 1;
1181 long m = 0;
1182
1183 current_addr = addr;
1184 if (first_addr <= addr && addr < second_addr) {
1185 n = addr - first_addr + 1;
1186 m = second_addr - addr;
1187 }
1188 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1189 for (; n-- > 0; np = np->q_forw) {
1190 SPL1();
1191 if ((lp = dup_line_node(np)) == NULL) {
1192 SPL0();
1193 return ERR;
1194 }
1195 add_line_node(lp);
1196 if (up)
1197 up->t = lp;
1198 else if ((up = push_undo_stack(UADD, current_addr,
1199 current_addr)) == NULL) {
1200 SPL0();
1201 return ERR;
1202 }
1203 modified = 1;
1204 SPL0();
1205 }
1206 return 0;
1207}
1208
1209
1210/* delete_lines: delete a range of lines */
1211int
1212delete_lines(from, to)
1213 long from, to;
1214{
1215 line_t *n, *p;
1216
1217 SPL1();
1218 if (push_undo_stack(UDEL, from, to) == NULL) {
1219 SPL0();
1220 return ERR;
1221 }
1222 n = get_addressed_line_node(INC_MOD(to, addr_last));
1223 p = get_addressed_line_node(from - 1);
1224 /* this get_addressed_line_node last! */
1225 if (isglobal)
1226 unset_active_nodes(p->q_forw, n);
1227 REQUE(p, n);
1228 addr_last -= to - from + 1;
1229 current_addr = from - 1;
1230 modified = 1;
1231 SPL0();
1232 return 0;
1233}
1234
1235
1236/* display_lines: print a range of lines to stdout */
1237int
1238display_lines(from, to, gflag)
1239 long from;
1240 long to;
1241 int gflag;
1242{
1243 line_t *bp;
1244 line_t *ep;
1245 char *s;
1246
1247 if (!from) {
1248 sprintf(errmsg, "invalid address");
1249 return ERR;
1250 }
1251 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1252 bp = get_addressed_line_node(from);
1253 for (; bp != ep; bp = bp->q_forw) {
1254 if ((s = get_sbuf_line(bp)) == NULL)
1255 return ERR;
1256 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1257 return ERR;
1258 }
1259 return 0;
1260}
1261
1262
1263#define MAXMARK 26 /* max number of marks */
1264
1265line_t *mark[MAXMARK]; /* line markers */
1266int markno; /* line marker count */
1267
1268/* mark_line_node: set a line node mark */
1269int
1270mark_line_node(lp, n)
1271 line_t *lp;
1272 int n;
1273{
1274 if (!islower((unsigned char)n)) {
1275 sprintf(errmsg, "invalid mark character");
1276 return ERR;
1277 } else if (mark[n - 'a'] == NULL)
1278 markno++;
1279 mark[n - 'a'] = lp;
1280 return 0;
1281}
1282
1283
1284/* get_marked_node_addr: return address of a marked line */
1285long
1286get_marked_node_addr(n)
1287 int n;
1288{
1289 if (!islower((unsigned char)n)) {
1290 sprintf(errmsg, "invalid mark character");
1291 return ERR;
1292 }
1293 return get_line_node_addr(mark[n - 'a']);
1294}
1295
1296
1297/* unmark_line_node: clear line node mark */
1298void
1299unmark_line_node(lp)
1300 line_t *lp;
1301{
1302 int i;
1303
1304 for (i = 0; markno && i < MAXMARK; i++)
1305 if (mark[i] == lp) {
1306 mark[i] = NULL;
1307 markno--;
1308 }
1309}
1310
1311
1312/* dup_line_node: return a pointer to a copy of a line node */
1313line_t *
1314dup_line_node(lp)
1315 line_t *lp;
1316{
1317 line_t *np;
1318
1319 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1320 fprintf(stderr, "%s\n", strerror(errno));
1321 sprintf(errmsg, "out of memory");
1322 return NULL;
1323 }
1324 np->seek = lp->seek;
1325 np->len = lp->len;
1326 return np;
1327}
1328
1329
1330/* has_trailing_escape: return the parity of escapes preceding a character
1331 in a string */
1332int
1333has_trailing_escape(s, t)
1334 char *s;
1335 char *t;
1336{
1337 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1338}
1339
1340
1341/* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */
1342char *
1343strip_escapes(s)
1344 char *s;
1345{
1346 static char *file = NULL;
1347 static int filesz = 0;
1348
1349 int i = 0;
1350
1351 REALLOC(file, filesz, MAXPATHLEN + 1, NULL);
1352 while (i < filesz - 1 /* Worry about a possible trailing escape */
1353 && (file[i++] = (*s == '\\') ? *++s : *s))
1354 s++;
1355 return file;
1356}
1357
1358
1359void
1360signal_hup(signo)
1361 int signo;
1362{
1363 if (mutex)
1364 sigflags |= (1 << (signo - 1));
1365 else
1366 handle_hup(signo);
1367}
1368
1369
1370void
1371signal_int(signo)
1372 int signo;
1373{
1374 if (mutex)
1375 sigflags |= (1 << (signo - 1));
1376 else
1377 handle_int(signo);
1378}
1379
1380
1381void
1382handle_hup(signo)
1383 int signo;
1384{
1385 char *hup = NULL; /* hup filename */
1386 char *s;
1387 int n;
1388
1389 if (!sigactive)
1390 quit(1);
1391 sigflags &= ~(1 << (signo - 1));
1392 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 &&
1393 (s = getenv("HOME")) != NULL &&
1394 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */
1395 (hup = (char *) malloc(n + 10)) != NULL) {
1396 strcpy(hup, s);
1397 if (hup[n - 1] != '/')
1398 hup[n] = '/', hup[n+1] = '\0';
1399 strcat(hup, "ed.hup");
1400 write_file(hup, "w", 1, addr_last);
1401 }
1402 quit(2);
1403}
1404
1405
1406void
1407handle_int(signo)
1408 int signo;
1409{
1410 if (!sigactive)
1411 quit(1);
1412 sigflags &= ~(1 << (signo - 1));
1413#ifdef _POSIX_SOURCE
1414 siglongjmp(env, -1);
1415#else
1416 longjmp(env, -1);
1417#endif
1418}
1419
1420
1421int cols = 72; /* wrap column */
1422
1423void
1424handle_winch(signo)
1425 int signo;
1426{
1427 int save_errno = errno;
1428
1429 struct winsize ws; /* window size structure */
1430
1431 sigflags &= ~(1 << (signo - 1));
1432 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1433 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1434 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1435 }
1436 errno = save_errno;
1437}
1438
1439
1440/* is_legal_filename: return a legal filename */
1441int
1442is_legal_filename(s)
1443 char *s;
1444{
1445 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1446 sprintf(errmsg, "shell access restricted");
1447 return 0;
1448 }
1449 return 1;
1450}