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 const char copyright[] =
31"@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\
32 All rights reserved.\n";
33#endif /* not lint */
34
35#ifndef lint
36static const char rcsid[] =
|
37 "$FreeBSD: head/bin/ed/main.c 81220 2001-08-06 22:01:31Z mike $";
|
| 37 "$FreeBSD: head/bin/ed/main.c 90109 2002-02-02 06:36:49Z imp $"; |
38#endif /* not lint */
39
40/*
41 * CREDITS
42 *
43 * This program is based on the editor algorithm described in
44 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
45 * in Pascal," Addison-Wesley, 1981.
46 *
47 * The buffering algorithm is attributed to Rodney Ruddock of
48 * the University of Guelph, Guelph, Ontario.
49 *
50 * The cbc.c encryption code is adapted from
51 * the bdes program by Matt Bishop of Dartmouth College,
52 * Hanover, NH.
53 *
54 */
55
56#include <sys/types.h>
57
58#include <sys/ioctl.h>
59#include <sys/wait.h>
60#include <ctype.h>
61#include <locale.h>
62#include <pwd.h>
63#include <setjmp.h>
64
65#include "ed.h"
66
67
68#ifdef _POSIX_SOURCE
69sigjmp_buf env;
70#else
71jmp_buf env;
72#endif
73
74/* static buffers */
75char stdinbuf[1]; /* stdin buffer */
76char *shcmd; /* shell command buffer */
77int shcmdsz; /* shell command buffer size */
78int shcmdi; /* shell command buffer index */
79char *ibuf; /* ed command-line buffer */
80int ibufsz; /* ed command-line buffer size */
81char *ibufp; /* pointer to ed command-line buffer */
82
83/* global flags */
84int des = 0; /* if set, use crypt(3) for i/o */
85int garrulous = 0; /* if set, print all error messages */
86int isbinary; /* if set, buffer contains ASCII NULs */
87int isglobal; /* if set, doing a global command */
88int modified; /* if set, buffer modified since last write */
89int mutex = 0; /* if set, signals set "sigflags" */
90int red = 0; /* if set, restrict shell/directory access */
91int scripted = 0; /* if set, suppress diagnostics */
92int sigflags = 0; /* if set, signals received while mutex set */
93int sigactive = 0; /* if set, signal handlers are enabled */
94
95char old_filename[PATH_MAX] = ""; /* default filename */
96long current_addr; /* current address in editor buffer */
97long addr_last; /* last address in editor buffer */
98int lineno; /* script line number */
99const char *prompt; /* command-line prompt */
100const char *dps = "*"; /* default command-line prompt */
101
102const char usage[] = "usage: %s [-] [-sx] [-p string] [name]\n";
103
104/* ed: line editor */
105int
|
106main(argc, argv)
107 int argc;
108 char **argv;
|
| 106main(int argc, char *argv[]) |
107{
108 int c, n;
109 long status = 0;
110#if __GNUC__
111 /* Avoid longjmp clobbering */
112 (void) &argc;
113 (void) &argv;
114#endif
115
116 (void)setlocale(LC_ALL, "");
117
118 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
119top:
120 while ((c = getopt(argc, argv, "p:sx")) != -1)
121 switch(c) {
122 case 'p': /* set prompt */
123 prompt = optarg;
124 break;
125 case 's': /* run script */
126 scripted = 1;
127 break;
128 case 'x': /* use crypt */
129#ifdef DES
130 des = get_keyword();
131#else
132 fprintf(stderr, "crypt unavailable\n?\n");
133#endif
134 break;
135
136 default:
137 fprintf(stderr, usage, argv[0]);
138 exit(1);
139 }
140 argv += optind;
141 argc -= optind;
142 if (argc && **argv == '-') {
143 scripted = 1;
144 if (argc > 1) {
145 optind = 1;
146 goto top;
147 }
148 argv++;
149 argc--;
150 }
151 /* assert: reliable signals! */
152#ifdef SIGWINCH
153 handle_winch(SIGWINCH);
154 if (isatty(0)) signal(SIGWINCH, handle_winch);
155#endif
156 signal(SIGHUP, signal_hup);
157 signal(SIGQUIT, SIG_IGN);
158 signal(SIGINT, signal_int);
159#ifdef _POSIX_SOURCE
160 if ((status = sigsetjmp(env, 1)))
161#else
162 if ((status = setjmp(env)))
163#endif
164 {
165 fputs("\n?\n", stderr);
166 errmsg = "interrupt";
167 } else {
168 init_buffers();
169 sigactive = 1; /* enable signal handlers */
170 if (argc && **argv && is_legal_filename(*argv)) {
171 if (read_file(*argv, 0) < 0 && !isatty(0))
172 quit(2);
173 else if (**argv != '!')
174 if (strlcpy(old_filename, *argv, sizeof(old_filename))
175 >= sizeof(old_filename))
176 quit(2);
177 } else if (argc) {
178 fputs("?\n", stderr);
179 if (**argv == '\0')
180 errmsg = "invalid filename";
181 if (!isatty(0))
182 quit(2);
183 }
184 }
185 for (;;) {
186 if (status < 0 && garrulous)
187 fprintf(stderr, "%s\n", errmsg);
188 if (prompt) {
189 printf("%s", prompt);
190 fflush(stdout);
191 }
192 if ((n = get_tty_line()) < 0) {
193 status = ERR;
194 continue;
195 } else if (n == 0) {
196 if (modified && !scripted) {
197 fputs("?\n", stderr);
198 errmsg = "warning: file modified";
199 if (!isatty(0)) {
200 fprintf(stderr, garrulous ?
201 "script, line %d: %s\n" :
202 "", lineno, errmsg);
203 quit(2);
204 }
205 clearerr(stdin);
206 modified = 0;
207 status = EMOD;
208 continue;
209 } else
210 quit(0);
211 } else if (ibuf[n - 1] != '\n') {
212 /* discard line */
213 errmsg = "unexpected end-of-file";
214 clearerr(stdin);
215 status = ERR;
216 continue;
217 }
218 isglobal = 0;
219 if ((status = extract_addr_range()) >= 0 &&
220 (status = exec_command()) >= 0)
221 if (!status ||
222 (status = display_lines(current_addr, current_addr,
223 status)) >= 0)
224 continue;
225 switch (status) {
226 case EOF:
227 quit(0);
228 case EMOD:
229 modified = 0;
230 fputs("?\n", stderr); /* give warning */
231 errmsg = "warning: file modified";
232 if (!isatty(0)) {
233 fprintf(stderr, garrulous ?
234 "script, line %d: %s\n" :
235 "", lineno, errmsg);
236 quit(2);
237 }
238 break;
239 case FATAL:
240 if (!isatty(0))
241 fprintf(stderr, garrulous ?
242 "script, line %d: %s\n" : "",
243 lineno, errmsg);
244 else
245 fprintf(stderr, garrulous ? "%s\n" : "",
246 errmsg);
247 quit(3);
248 default:
249 fputs("?\n", stderr);
250 if (!isatty(0)) {
251 fprintf(stderr, garrulous ?
252 "script, line %d: %s\n" : "",
253 lineno, errmsg);
254 quit(2);
255 }
256 break;
257 }
258 }
259 /*NOTREACHED*/
260}
261
262long first_addr, second_addr, addr_cnt;
263
264/* extract_addr_range: get line addresses from the command buffer until an
265 illegal address is seen; return status */
266int
|
269extract_addr_range()
|
| 267extract_addr_range(void) |
268{
269 long addr;
270
271 addr_cnt = 0;
272 first_addr = second_addr = current_addr;
273 while ((addr = next_addr()) >= 0) {
274 addr_cnt++;
275 first_addr = second_addr;
276 second_addr = addr;
277 if (*ibufp != ',' && *ibufp != ';')
278 break;
279 else if (*ibufp++ == ';')
280 current_addr = addr;
281 }
282 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
283 first_addr = second_addr;
284 return (addr == ERR) ? ERR : 0;
285}
286
287
288#define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
289
290#define MUST_BE_FIRST() do { \
291 if (!first) { \
292 errmsg = "invalid address"; \
293 return ERR; \
294 } \
295} while (0);
296
297/* next_addr: return the next line address in the command buffer */
298long
|
301next_addr()
|
| 299next_addr(void) |
300{
301 const char *hd;
302 long addr = current_addr;
303 long n;
304 int first = 1;
305 int c;
306
307 SKIP_BLANKS();
308 for (hd = ibufp;; first = 0)
309 switch (c = *ibufp) {
310 case '+':
311 case '\t':
312 case ' ':
313 case '-':
314 case '^':
315 ibufp++;
316 SKIP_BLANKS();
317 if (isdigit((unsigned char)*ibufp)) {
318 STRTOL(n, ibufp);
319 addr += (c == '-' || c == '^') ? -n : n;
320 } else if (!isspace((unsigned char)c))
321 addr += (c == '-' || c == '^') ? -1 : 1;
322 break;
323 case '0': case '1': case '2':
324 case '3': case '4': case '5':
325 case '6': case '7': case '8': case '9':
326 MUST_BE_FIRST();
327 STRTOL(addr, ibufp);
328 break;
329 case '.':
330 case '$':
331 MUST_BE_FIRST();
332 ibufp++;
333 addr = (c == '.') ? current_addr : addr_last;
334 break;
335 case '/':
336 case '?':
337 MUST_BE_FIRST();
338 if ((addr = get_matching_node_addr(
339 get_compiled_pattern(), c == '/')) < 0)
340 return ERR;
341 else if (c == *ibufp)
342 ibufp++;
343 break;
344 case '\'':
345 MUST_BE_FIRST();
346 ibufp++;
347 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
348 return ERR;
349 break;
350 case '%':
351 case ',':
352 case ';':
353 if (first) {
354 ibufp++;
355 addr_cnt++;
356 second_addr = (c == ';') ? current_addr : 1;
357 addr = addr_last;
358 break;
359 }
360 /* FALL THROUGH */
361 default:
362 if (ibufp == hd)
363 return EOF;
364 else if (addr < 0 || addr_last < addr) {
365 errmsg = "invalid address";
366 return ERR;
367 } else
368 return addr;
369 }
370 /* NOTREACHED */
371}
372
373
374#ifdef BACKWARDS
375/* GET_THIRD_ADDR: get a legal address from the command buffer */
376#define GET_THIRD_ADDR(addr) \
377{ \
378 long ol1, ol2; \
379\
380 ol1 = first_addr, ol2 = second_addr; \
381 if (extract_addr_range() < 0) \
382 return ERR; \
383 else if (addr_cnt == 0) { \
384 errmsg = "destination expected"; \
385 return ERR; \
386 } else if (second_addr < 0 || addr_last < second_addr) { \
387 errmsg = "invalid address"; \
388 return ERR; \
389 } \
390 addr = second_addr; \
391 first_addr = ol1, second_addr = ol2; \
392}
393#else /* BACKWARDS */
394/* GET_THIRD_ADDR: get a legal address from the command buffer */
395#define GET_THIRD_ADDR(addr) \
396{ \
397 long ol1, ol2; \
398\
399 ol1 = first_addr, ol2 = second_addr; \
400 if (extract_addr_range() < 0) \
401 return ERR; \
402 if (second_addr < 0 || addr_last < second_addr) { \
403 errmsg = "invalid address"; \
404 return ERR; \
405 } \
406 addr = second_addr; \
407 first_addr = ol1, second_addr = ol2; \
408}
409#endif
410
411
412/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
413#define GET_COMMAND_SUFFIX() { \
414 int done = 0; \
415 do { \
416 switch(*ibufp) { \
417 case 'p': \
418 gflag |= GPR, ibufp++; \
419 break; \
420 case 'l': \
421 gflag |= GLS, ibufp++; \
422 break; \
423 case 'n': \
424 gflag |= GNP, ibufp++; \
425 break; \
426 default: \
427 done++; \
428 } \
429 } while (!done); \
430 if (*ibufp++ != '\n') { \
431 errmsg = "invalid command suffix"; \
432 return ERR; \
433 } \
434}
435
436
437/* sflags */
438#define SGG 001 /* complement previous global substitute suffix */
439#define SGP 002 /* complement previous print suffix */
440#define SGR 004 /* use last regex instead of last pat */
441#define SGF 010 /* repeat last substitution */
442
443int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
444
445long rows = 22; /* scroll length: ws_row - 2 */
446
447/* exec_command: execute the next command in command buffer; return print
448 request, if any */
449int
|
452exec_command()
|
| 450exec_command(void) |
451{
452 extern long u_current_addr;
453 extern long u_addr_last;
454
455 static pattern_t *pat = NULL;
456 static int sgflag = 0;
457 static long sgnum = 0;
458
459 pattern_t *tpat;
460 char *fnp;
461 int gflag = 0;
462 int sflags = 0;
463 long addr = 0;
464 int n = 0;
465 int c;
466
467 SKIP_BLANKS();
468 switch(c = *ibufp++) {
469 case 'a':
470 GET_COMMAND_SUFFIX();
471 if (!isglobal) clear_undo_stack();
472 if (append_lines(second_addr) < 0)
473 return ERR;
474 break;
475 case 'c':
476 if (check_addr_range(current_addr, current_addr) < 0)
477 return ERR;
478 GET_COMMAND_SUFFIX();
479 if (!isglobal) clear_undo_stack();
480 if (delete_lines(first_addr, second_addr) < 0 ||
481 append_lines(current_addr) < 0)
482 return ERR;
483 break;
484 case 'd':
485 if (check_addr_range(current_addr, current_addr) < 0)
486 return ERR;
487 GET_COMMAND_SUFFIX();
488 if (!isglobal) clear_undo_stack();
489 if (delete_lines(first_addr, second_addr) < 0)
490 return ERR;
491 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
492 current_addr = addr;
493 break;
494 case 'e':
495 if (modified && !scripted)
496 return EMOD;
497 /* fall through */
498 case 'E':
499 if (addr_cnt > 0) {
500 errmsg = "unexpected address";
501 return ERR;
502 } else if (!isspace((unsigned char)*ibufp)) {
503 errmsg = "unexpected command suffix";
504 return ERR;
505 } else if ((fnp = get_filename()) == NULL)
506 return ERR;
507 GET_COMMAND_SUFFIX();
508 if (delete_lines(1, addr_last) < 0)
509 return ERR;
510 clear_undo_stack();
511 if (close_sbuf() < 0)
512 return ERR;
513 else if (open_sbuf() < 0)
514 return FATAL;
515 if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
516#ifdef BACKWARDS
517 if (*fnp == '\0' && *old_filename == '\0') {
518 errmsg = "no current filename";
519 return ERR;
520 }
521#endif
522 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
523 return ERR;
524 clear_undo_stack();
525 modified = 0;
526 u_current_addr = u_addr_last = -1;
527 break;
528 case 'f':
529 if (addr_cnt > 0) {
530 errmsg = "unexpected address";
531 return ERR;
532 } else if (!isspace((unsigned char)*ibufp)) {
533 errmsg = "unexpected command suffix";
534 return ERR;
535 } else if ((fnp = get_filename()) == NULL)
536 return ERR;
537 else if (*fnp == '!') {
538 errmsg = "invalid redirection";
539 return ERR;
540 }
541 GET_COMMAND_SUFFIX();
542 if (*fnp) strcpy(old_filename, fnp);
543 printf("%s\n", strip_escapes(old_filename));
544 break;
545 case 'g':
546 case 'v':
547 case 'G':
548 case 'V':
549 if (isglobal) {
550 errmsg = "cannot nest global commands";
551 return ERR;
552 } else if (check_addr_range(1, addr_last) < 0)
553 return ERR;
554 else if (build_active_list(c == 'g' || c == 'G') < 0)
555 return ERR;
556 else if ((n = (c == 'G' || c == 'V')))
557 GET_COMMAND_SUFFIX();
558 isglobal++;
559 if (exec_global(n, gflag) < 0)
560 return ERR;
561 break;
562 case 'h':
563 if (addr_cnt > 0) {
564 errmsg = "unexpected address";
565 return ERR;
566 }
567 GET_COMMAND_SUFFIX();
568 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
569 break;
570 case 'H':
571 if (addr_cnt > 0) {
572 errmsg = "unexpected address";
573 return ERR;
574 }
575 GET_COMMAND_SUFFIX();
576 if ((garrulous = 1 - garrulous) && *errmsg)
577 fprintf(stderr, "%s\n", errmsg);
578 break;
579 case 'i':
580 if (second_addr == 0) {
581 errmsg = "invalid address";
582 return ERR;
583 }
584 GET_COMMAND_SUFFIX();
585 if (!isglobal) clear_undo_stack();
586 if (append_lines(second_addr - 1) < 0)
587 return ERR;
588 break;
589 case 'j':
590 if (check_addr_range(current_addr, current_addr + 1) < 0)
591 return ERR;
592 GET_COMMAND_SUFFIX();
593 if (!isglobal) clear_undo_stack();
594 if (first_addr != second_addr &&
595 join_lines(first_addr, second_addr) < 0)
596 return ERR;
597 break;
598 case 'k':
599 c = *ibufp++;
600 if (second_addr == 0) {
601 errmsg = "invalid address";
602 return ERR;
603 }
604 GET_COMMAND_SUFFIX();
605 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
606 return ERR;
607 break;
608 case 'l':
609 if (check_addr_range(current_addr, current_addr) < 0)
610 return ERR;
611 GET_COMMAND_SUFFIX();
612 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
613 return ERR;
614 gflag = 0;
615 break;
616 case 'm':
617 if (check_addr_range(current_addr, current_addr) < 0)
618 return ERR;
619 GET_THIRD_ADDR(addr);
620 if (first_addr <= addr && addr < second_addr) {
621 errmsg = "invalid destination";
622 return ERR;
623 }
624 GET_COMMAND_SUFFIX();
625 if (!isglobal) clear_undo_stack();
626 if (move_lines(addr) < 0)
627 return ERR;
628 break;
629 case 'n':
630 if (check_addr_range(current_addr, current_addr) < 0)
631 return ERR;
632 GET_COMMAND_SUFFIX();
633 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
634 return ERR;
635 gflag = 0;
636 break;
637 case 'p':
638 if (check_addr_range(current_addr, current_addr) < 0)
639 return ERR;
640 GET_COMMAND_SUFFIX();
641 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
642 return ERR;
643 gflag = 0;
644 break;
645 case 'P':
646 if (addr_cnt > 0) {
647 errmsg = "unexpected address";
648 return ERR;
649 }
650 GET_COMMAND_SUFFIX();
651 prompt = prompt ? NULL : optarg ? optarg : dps;
652 break;
653 case 'q':
654 case 'Q':
655 if (addr_cnt > 0) {
656 errmsg = "unexpected address";
657 return ERR;
658 }
659 GET_COMMAND_SUFFIX();
660 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
661 break;
662 case 'r':
663 if (!isspace((unsigned char)*ibufp)) {
664 errmsg = "unexpected command suffix";
665 return ERR;
666 } else if (addr_cnt == 0)
667 second_addr = addr_last;
668 if ((fnp = get_filename()) == NULL)
669 return ERR;
670 GET_COMMAND_SUFFIX();
671 if (!isglobal) clear_undo_stack();
672 if (*old_filename == '\0' && *fnp != '!')
673 strcpy(old_filename, fnp);
674#ifdef BACKWARDS
675 if (*fnp == '\0' && *old_filename == '\0') {
676 errmsg = "no current filename";
677 return ERR;
678 }
679#endif
680 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
681 return ERR;
682 else if (addr && addr != addr_last)
683 modified = 1;
684 break;
685 case 's':
686 do {
687 switch(*ibufp) {
688 case '\n':
689 sflags |=SGF;
690 break;
691 case 'g':
692 sflags |= SGG;
693 ibufp++;
694 break;
695 case 'p':
696 sflags |= SGP;
697 ibufp++;
698 break;
699 case 'r':
700 sflags |= SGR;
701 ibufp++;
702 break;
703 case '0': case '1': case '2': case '3': case '4':
704 case '5': case '6': case '7': case '8': case '9':
705 STRTOL(sgnum, ibufp);
706 sflags |= SGF;
707 sgflag &= ~GSG; /* override GSG */
708 break;
709 default:
710 if (sflags) {
711 errmsg = "invalid command suffix";
712 return ERR;
713 }
714 }
715 } while (sflags && *ibufp != '\n');
716 if (sflags && !pat) {
717 errmsg = "no previous substitution";
718 return ERR;
719 } else if (sflags & SGG)
720 sgnum = 0; /* override numeric arg */
721 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
722 errmsg = "invalid pattern delimiter";
723 return ERR;
724 }
725 tpat = pat;
726 SPL1();
727 if ((!sflags || (sflags & SGR)) &&
728 (tpat = get_compiled_pattern()) == NULL) {
729 SPL0();
730 return ERR;
731 } else if (tpat != pat) {
732 if (pat) {
733 regfree(pat);
734 free(pat);
735 }
736 pat = tpat;
737 patlock = 1; /* reserve pattern */
738 }
739 SPL0();
740 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
741 return ERR;
742 else if (isglobal)
743 sgflag |= GLB;
744 else
745 sgflag &= ~GLB;
746 if (sflags & SGG)
747 sgflag ^= GSG;
748 if (sflags & SGP)
749 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
750 do {
751 switch(*ibufp) {
752 case 'p':
753 sgflag |= GPR, ibufp++;
754 break;
755 case 'l':
756 sgflag |= GLS, ibufp++;
757 break;
758 case 'n':
759 sgflag |= GNP, ibufp++;
760 break;
761 default:
762 n++;
763 }
764 } while (!n);
765 if (check_addr_range(current_addr, current_addr) < 0)
766 return ERR;
767 GET_COMMAND_SUFFIX();
768 if (!isglobal) clear_undo_stack();
769 if (search_and_replace(pat, sgflag, sgnum) < 0)
770 return ERR;
771 break;
772 case 't':
773 if (check_addr_range(current_addr, current_addr) < 0)
774 return ERR;
775 GET_THIRD_ADDR(addr);
776 GET_COMMAND_SUFFIX();
777 if (!isglobal) clear_undo_stack();
778 if (copy_lines(addr) < 0)
779 return ERR;
780 break;
781 case 'u':
782 if (addr_cnt > 0) {
783 errmsg = "unexpected address";
784 return ERR;
785 }
786 GET_COMMAND_SUFFIX();
787 if (pop_undo_stack() < 0)
788 return ERR;
789 break;
790 case 'w':
791 case 'W':
792 if ((n = *ibufp) == 'q' || n == 'Q') {
793 gflag = EOF;
794 ibufp++;
795 }
796 if (!isspace((unsigned char)*ibufp)) {
797 errmsg = "unexpected command suffix";
798 return ERR;
799 } else if ((fnp = get_filename()) == NULL)
800 return ERR;
801 if (addr_cnt == 0 && !addr_last)
802 first_addr = second_addr = 0;
803 else if (check_addr_range(1, addr_last) < 0)
804 return ERR;
805 GET_COMMAND_SUFFIX();
806 if (*old_filename == '\0' && *fnp != '!')
807 strcpy(old_filename, fnp);
808#ifdef BACKWARDS
809 if (*fnp == '\0' && *old_filename == '\0') {
810 errmsg = "no current filename";
811 return ERR;
812 }
813#endif
814 if ((addr = write_file(*fnp ? fnp : old_filename,
815 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
816 return ERR;
817 else if (addr == addr_last)
818 modified = 0;
819 else if (modified && !scripted && n == 'q')
820 gflag = EMOD;
821 break;
822 case 'x':
823 if (addr_cnt > 0) {
824 errmsg = "unexpected address";
825 return ERR;
826 }
827 GET_COMMAND_SUFFIX();
828#ifdef DES
829 des = get_keyword();
830#else
831 errmsg = "crypt unavailable";
832 return ERR;
833#endif
834 break;
835 case 'z':
836#ifdef BACKWARDS
837 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
838#else
839 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
840#endif
841 return ERR;
842 else if ('0' < *ibufp && *ibufp <= '9')
843 STRTOL(rows, ibufp);
844 GET_COMMAND_SUFFIX();
845 if (display_lines(second_addr, min(addr_last,
846 second_addr + rows), gflag) < 0)
847 return ERR;
848 gflag = 0;
849 break;
850 case '=':
851 GET_COMMAND_SUFFIX();
852 printf("%ld\n", addr_cnt ? second_addr : addr_last);
853 break;
854 case '!':
855 if (addr_cnt > 0) {
856 errmsg = "unexpected address";
857 return ERR;
858 } else if ((sflags = get_shell_command()) < 0)
859 return ERR;
860 GET_COMMAND_SUFFIX();
861 if (sflags) printf("%s\n", shcmd + 1);
862 system(shcmd + 1);
863 if (!scripted) printf("!\n");
864 break;
865 case '\n':
866#ifdef BACKWARDS
867 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
868#else
869 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
870#endif
871 || display_lines(second_addr, second_addr, 0) < 0)
872 return ERR;
873 break;
874 default:
875 errmsg = "unknown command";
876 return ERR;
877 }
878 return gflag;
879}
880
881
882/* check_addr_range: return status of address range check */
883int
|
886check_addr_range(n, m)
887 long n, m;
|
| 884check_addr_range(long n, long m) |
885{
886 if (addr_cnt == 0) {
887 first_addr = n;
888 second_addr = m;
889 }
890 if (first_addr > second_addr || 1 > first_addr ||
891 second_addr > addr_last) {
892 errmsg = "invalid address";
893 return ERR;
894 }
895 return 0;
896}
897
898
899/* get_matching_node_addr: return the address of the next line matching a
900 pattern in a given direction. wrap around begin/end of editor buffer if
901 necessary */
902long
|
906get_matching_node_addr(pat, dir)
907 pattern_t *pat;
908 int dir;
|
| 903get_matching_node_addr(pattern_t *pat, int dir) |
904{
905 char *s;
906 long n = current_addr;
907 line_t *lp;
908
909 if (!pat) return ERR;
910 do {
911 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
912 lp = get_addressed_line_node(n);
913 if ((s = get_sbuf_line(lp)) == NULL)
914 return ERR;
915 if (isbinary)
916 NUL_TO_NEWLINE(s, lp->len);
917 if (!regexec(pat, s, 0, NULL, 0))
918 return n;
919 }
920 } while (n != current_addr);
921 errmsg = "no match";
922 return ERR;
923}
924
925
926/* get_filename: return pointer to copy of filename in the command buffer */
927char *
|
933get_filename()
|
| 928get_filename(void) |
929{
930 static char *file = NULL;
931 static int filesz = 0;
932
933 int n;
934
935 if (*ibufp != '\n') {
936 SKIP_BLANKS();
937 if (*ibufp == '\n') {
938 errmsg = "invalid filename";
939 return NULL;
940 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
941 return NULL;
942 else if (*ibufp == '!') {
943 ibufp++;
944 if ((n = get_shell_command()) < 0)
945 return NULL;
946 if (n)
947 printf("%s\n", shcmd + 1);
948 return shcmd;
949 } else if (n > PATH_MAX - 1) {
950 errmsg = "filename too long";
951 return NULL;
952 }
953 }
954#ifndef BACKWARDS
955 else if (*old_filename == '\0') {
956 errmsg = "no current filename";
957 return NULL;
958 }
959#endif
960 REALLOC(file, filesz, PATH_MAX, NULL);
961 for (n = 0; *ibufp != '\n';)
962 file[n++] = *ibufp++;
963 file[n] = '\0';
964 return is_legal_filename(file) ? file : NULL;
965}
966
967
968/* get_shell_command: read a shell command from stdin; return substitution
969 status */
970int
|
976get_shell_command()
|
| 971get_shell_command(void) |
972{
973 static char *buf = NULL;
974 static int n = 0;
975
976 char *s; /* substitution char pointer */
977 int i = 0;
978 int j = 0;
979
980 if (red) {
981 errmsg = "shell access restricted";
982 return ERR;
983 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
984 return ERR;
985 REALLOC(buf, n, j + 1, ERR);
986 buf[i++] = '!'; /* prefix command w/ bang */
987 while (*ibufp != '\n')
988 switch (*ibufp) {
989 default:
990 REALLOC(buf, n, i + 2, ERR);
991 buf[i++] = *ibufp;
992 if (*ibufp++ == '\\')
993 buf[i++] = *ibufp++;
994 break;
995 case '!':
996 if (s != ibufp) {
997 REALLOC(buf, n, i + 1, ERR);
998 buf[i++] = *ibufp++;
999 }
1000#ifdef BACKWARDS
1001 else if (shcmd == NULL || *(shcmd + 1) == '\0')
1002#else
1003 else if (shcmd == NULL)
1004#endif
1005 {
1006 errmsg = "no previous command";
1007 return ERR;
1008 } else {
1009 REALLOC(buf, n, i + shcmdi, ERR);
1010 for (s = shcmd + 1; s < shcmd + shcmdi;)
1011 buf[i++] = *s++;
1012 s = ibufp++;
1013 }
1014 break;
1015 case '%':
1016 if (*old_filename == '\0') {
1017 errmsg = "no current filename";
1018 return ERR;
1019 }
1020 j = strlen(s = strip_escapes(old_filename));
1021 REALLOC(buf, n, i + j, ERR);
1022 while (j--)
1023 buf[i++] = *s++;
1024 s = ibufp++;
1025 break;
1026 }
1027 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1028 memcpy(shcmd, buf, i);
1029 shcmd[shcmdi = i] = '\0';
1030 return *s == '!' || *s == '%';
1031}
1032
1033
1034/* append_lines: insert text from stdin to after line n; stop when either a
1035 single period is read or EOF; return status */
1036int
|
1042append_lines(n)
1043 long n;
|
| 1037append_lines(long n) |
1038{
1039 int l;
1040 const char *lp = ibuf;
1041 const char *eot;
1042 undo_t *up = NULL;
1043
1044 for (current_addr = n;;) {
1045 if (!isglobal) {
1046 if ((l = get_tty_line()) < 0)
1047 return ERR;
1048 else if (l == 0 || ibuf[l - 1] != '\n') {
1049 clearerr(stdin);
1050 return l ? EOF : 0;
1051 }
1052 lp = ibuf;
1053 } else if (*(lp = ibufp) == '\0')
1054 return 0;
1055 else {
1056 while (*ibufp++ != '\n')
1057 ;
1058 l = ibufp - lp;
1059 }
1060 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1061 return 0;
1062 }
1063 eot = lp + l;
1064 SPL1();
1065 do {
1066 if ((lp = put_sbuf_line(lp)) == NULL) {
1067 SPL0();
1068 return ERR;
1069 } else if (up)
1070 up->t = get_addressed_line_node(current_addr);
1071 else if ((up = push_undo_stack(UADD, current_addr,
1072 current_addr)) == NULL) {
1073 SPL0();
1074 return ERR;
1075 }
1076 } while (lp != eot);
1077 modified = 1;
1078 SPL0();
1079 }
1080 /* NOTREACHED */
1081}
1082
1083
1084/* join_lines: replace a range of lines with the joined text of those lines */
1085int
|
1092join_lines(from, to)
1093 long from;
1094 long to;
|
| 1086join_lines(long from, long to) |
1087{
1088 static char *buf = NULL;
1089 static int n;
1090
1091 char *s;
1092 int size = 0;
1093 line_t *bp, *ep;
1094
1095 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1096 bp = get_addressed_line_node(from);
1097 for (; bp != ep; bp = bp->q_forw) {
1098 if ((s = get_sbuf_line(bp)) == NULL)
1099 return ERR;
1100 REALLOC(buf, n, size + bp->len, ERR);
1101 memcpy(buf + size, s, bp->len);
1102 size += bp->len;
1103 }
1104 REALLOC(buf, n, size + 2, ERR);
1105 memcpy(buf + size, "\n", 2);
1106 if (delete_lines(from, to) < 0)
1107 return ERR;
1108 current_addr = from - 1;
1109 SPL1();
1110 if (put_sbuf_line(buf) == NULL ||
1111 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1112 SPL0();
1113 return ERR;
1114 }
1115 modified = 1;
1116 SPL0();
1117 return 0;
1118}
1119
1120
1121/* move_lines: move a range of lines */
1122int
|
1131move_lines(addr)
1132 long addr;
|
| 1123move_lines(long addr) |
1124{
1125 line_t *b1, *a1, *b2, *a2;
1126 long n = INC_MOD(second_addr, addr_last);
1127 long p = first_addr - 1;
1128 int done = (addr == first_addr - 1 || addr == second_addr);
1129
1130 SPL1();
1131 if (done) {
1132 a2 = get_addressed_line_node(n);
1133 b2 = get_addressed_line_node(p);
1134 current_addr = second_addr;
1135 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1136 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1137 SPL0();
1138 return ERR;
1139 } else {
1140 a1 = get_addressed_line_node(n);
1141 if (addr < first_addr) {
1142 b1 = get_addressed_line_node(p);
1143 b2 = get_addressed_line_node(addr);
1144 /* this get_addressed_line_node last! */
1145 } else {
1146 b2 = get_addressed_line_node(addr);
1147 b1 = get_addressed_line_node(p);
1148 /* this get_addressed_line_node last! */
1149 }
1150 a2 = b2->q_forw;
1151 REQUE(b2, b1->q_forw);
1152 REQUE(a1->q_back, a2);
1153 REQUE(b1, a1);
1154 current_addr = addr + ((addr < first_addr) ?
1155 second_addr - first_addr + 1 : 0);
1156 }
1157 if (isglobal)
1158 unset_active_nodes(b2->q_forw, a2);
1159 modified = 1;
1160 SPL0();
1161 return 0;
1162}
1163
1164
1165/* copy_lines: copy a range of lines; return status */
1166int
|
1176copy_lines(addr)
1177 long addr;
|
| 1167copy_lines(long addr) |
1168{
1169 line_t *lp, *np = get_addressed_line_node(first_addr);
1170 undo_t *up = NULL;
1171 long n = second_addr - first_addr + 1;
1172 long m = 0;
1173
1174 current_addr = addr;
1175 if (first_addr <= addr && addr < second_addr) {
1176 n = addr - first_addr + 1;
1177 m = second_addr - addr;
1178 }
1179 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1180 for (; n-- > 0; np = np->q_forw) {
1181 SPL1();
1182 if ((lp = dup_line_node(np)) == NULL) {
1183 SPL0();
1184 return ERR;
1185 }
1186 add_line_node(lp);
1187 if (up)
1188 up->t = lp;
1189 else if ((up = push_undo_stack(UADD, current_addr,
1190 current_addr)) == NULL) {
1191 SPL0();
1192 return ERR;
1193 }
1194 modified = 1;
1195 SPL0();
1196 }
1197 return 0;
1198}
1199
1200
1201/* delete_lines: delete a range of lines */
1202int
|
1213delete_lines(from, to)
1214 long from, to;
|
| 1203delete_lines(long from, long to) |
1204{
1205 line_t *n, *p;
1206
1207 SPL1();
1208 if (push_undo_stack(UDEL, from, to) == NULL) {
1209 SPL0();
1210 return ERR;
1211 }
1212 n = get_addressed_line_node(INC_MOD(to, addr_last));
1213 p = get_addressed_line_node(from - 1);
1214 /* this get_addressed_line_node last! */
1215 if (isglobal)
1216 unset_active_nodes(p->q_forw, n);
1217 REQUE(p, n);
1218 addr_last -= to - from + 1;
1219 current_addr = from - 1;
1220 modified = 1;
1221 SPL0();
1222 return 0;
1223}
1224
1225
1226/* display_lines: print a range of lines to stdout */
1227int
|
1239display_lines(from, to, gflag)
1240 long from;
1241 long to;
1242 int gflag;
|
| 1228display_lines(long from, long to, int gflag) |
1229{
1230 line_t *bp;
1231 line_t *ep;
1232 char *s;
1233
1234 if (!from) {
1235 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
|
1271mark_line_node(lp, n)
1272 line_t *lp;
1273 int n;
|
| 1257mark_line_node(line_t *lp, int n) |
1258{
1259 if (!islower((unsigned char)n)) {
1260 errmsg = "invalid mark character";
1261 return ERR;
1262 } else if (mark[n - 'a'] == NULL)
1263 markno++;
1264 mark[n - 'a'] = lp;
1265 return 0;
1266}
1267
1268
1269/* get_marked_node_addr: return address of a marked line */
1270long
|
1287get_marked_node_addr(n)
1288 int n;
|
| 1271get_marked_node_addr(int n) |
1272{
1273 if (!islower((unsigned char)n)) {
1274 errmsg = "invalid mark character";
1275 return ERR;
1276 }
1277 return get_line_node_addr(mark[n - 'a']);
1278}
1279
1280
1281/* unmark_line_node: clear line node mark */
1282void
|
1300unmark_line_node(lp)
1301 line_t *lp;
|
| 1283unmark_line_node(line_t *lp) |
1284{
1285 int i;
1286
1287 for (i = 0; markno && i < MAXMARK; i++)
1288 if (mark[i] == lp) {
1289 mark[i] = NULL;
1290 markno--;
1291 }
1292}
1293
1294
1295/* dup_line_node: return a pointer to a copy of a line node */
1296line_t *
|
1315dup_line_node(lp)
1316 line_t *lp;
|
| 1297dup_line_node(line_t *lp) |
1298{
1299 line_t *np;
1300
1301 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1302 fprintf(stderr, "%s\n", strerror(errno));
1303 errmsg = "out of memory";
1304 return NULL;
1305 }
1306 np->seek = lp->seek;
1307 np->len = lp->len;
1308 return np;
1309}
1310
1311
1312/* has_trailing_escape: return the parity of escapes preceding a character
1313 in a string */
1314int
|
1334has_trailing_escape(s, t)
1335 char *s;
1336 char *t;
|
| 1315has_trailing_escape(char *s, char *t) |
1316{
1317 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1318}
1319
1320
1321/* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1322char *
|
1344strip_escapes(s)
1345 char *s;
|
| 1323strip_escapes(char *s) |
1324{
1325 static char *file = NULL;
1326 static int filesz = 0;
1327
1328 int i = 0;
1329
1330 REALLOC(file, filesz, PATH_MAX, NULL);
1331 while (i < filesz - 1 /* Worry about a possible trailing escape */
1332 && (file[i++] = (*s == '\\') ? *++s : *s))
1333 s++;
1334 return file;
1335}
1336
1337
1338void
|
1361signal_hup(signo)
1362 int signo;
|
| 1339signal_hup(int signo) |
1340{
1341 if (mutex)
1342 sigflags |= (1 << (signo - 1));
1343 else
1344 handle_hup(signo);
1345}
1346
1347
1348void
|
1372signal_int(signo)
1373 int signo;
|
| 1349signal_int(int signo) |
1350{
1351 if (mutex)
1352 sigflags |= (1 << (signo - 1));
1353 else
1354 handle_int(signo);
1355}
1356
1357
1358void
|
1383handle_hup(signo)
1384 int signo;
|
| 1359handle_hup(int signo) |
1360{
1361 char *hup = NULL; /* hup filename */
1362 char *s;
1363 char ed_hup[] = "ed.hup";
1364 int n;
1365
1366 if (!sigactive)
1367 quit(1);
1368 sigflags &= ~(1 << (signo - 1));
1369 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
1370 (s = getenv("HOME")) != NULL &&
1371 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1372 (hup = (char *) malloc(n + 10)) != NULL) {
1373 strcpy(hup, s);
1374 if (hup[n - 1] != '/')
1375 hup[n] = '/', hup[n+1] = '\0';
1376 strcat(hup, "ed.hup");
1377 write_file(hup, "w", 1, addr_last);
1378 }
1379 quit(2);
1380}
1381
1382
1383void
|
1409handle_int(signo)
1410 int signo;
|
| 1384handle_int(int signo) |
1385{
1386 if (!sigactive)
1387 quit(1);
1388 sigflags &= ~(1 << (signo - 1));
1389#ifdef _POSIX_SOURCE
1390 siglongjmp(env, -1);
1391#else
1392 longjmp(env, -1);
1393#endif
1394}
1395
1396
1397int cols = 72; /* wrap column */
1398
1399void
|
1426handle_winch(signo)
1427 int signo;
|
| 1400handle_winch(int signo) |
1401{
1402 int save_errno = errno;
1403
1404 struct winsize ws; /* window size structure */
1405
1406 sigflags &= ~(1 << (signo - 1));
1407 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1408 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1409 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1410 }
1411 errno = save_errno;
1412}
1413
1414
1415/* is_legal_filename: return a legal filename */
1416int
|
1444is_legal_filename(s)
1445 char *s;
|
| 1417is_legal_filename(char *s) |
1418{
1419 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1420 errmsg = "shell access restricted";
1421 return 0;
1422 }
1423 return 1;
1424}
|