Remove not needed void casts.
[dragonfly.git] / bin / ed / main.c
CommitLineData
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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.
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27 *
28 * @(#) Copyright (c) 1993 Andrew Moore, Talke Studio. All rights reserved.
29 * @(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp
30 * $FreeBSD: src/bin/ed/main.c,v 1.14.2.4 2001/08/01 02:36:03 obrien Exp $
57fed2af 31 * $DragonFly: src/bin/ed/main.c,v 1.7 2004/11/07 20:54:51 eirikn Exp $
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32 */
33
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34/*
35 * CREDITS
36 *
37 * This program is based on the editor algorithm described in
38 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
39 * in Pascal," Addison-Wesley, 1981.
40 *
41 * The buffering algorithm is attributed to Rodney Ruddock of
42 * the University of Guelph, Guelph, Ontario.
43 *
44 * The cbc.c encryption code is adapted from
45 * the bdes program by Matt Bishop of Dartmouth College,
46 * Hanover, NH.
47 *
48 */
49
50#include <sys/types.h>
51
52#include <sys/ioctl.h>
53#include <sys/wait.h>
54#include <ctype.h>
55#include <locale.h>
56#include <pwd.h>
57#include <setjmp.h>
58
59#include "ed.h"
60
61
62#ifdef _POSIX_SOURCE
63sigjmp_buf env;
64#else
65jmp_buf env;
66#endif
67
68/* static buffers */
69char stdinbuf[1]; /* stdin buffer */
70char *shcmd; /* shell command buffer */
71int shcmdsz; /* shell command buffer size */
72int shcmdi; /* shell command buffer index */
73char *ibuf; /* ed command-line buffer */
74int ibufsz; /* ed command-line buffer size */
75char *ibufp; /* pointer to ed command-line buffer */
76
77/* global flags */
78int des = 0; /* if set, use crypt(3) for i/o */
79int garrulous = 0; /* if set, print all error messages */
80int isbinary; /* if set, buffer contains ASCII NULs */
81int isglobal; /* if set, doing a global command */
82int modified; /* if set, buffer modified since last write */
83int mutex = 0; /* if set, signals set "sigflags" */
84int red = 0; /* if set, restrict shell/directory access */
85int scripted = 0; /* if set, suppress diagnostics */
86int sigflags = 0; /* if set, signals received while mutex set */
87int sigactive = 0; /* if set, signal handlers are enabled */
88
89char old_filename[PATH_MAX] = ""; /* default filename */
90long current_addr; /* current address in editor buffer */
91long addr_last; /* last address in editor buffer */
92int lineno; /* script line number */
c443019b
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93const char *prompt; /* command-line prompt */
94const char *dps = "*"; /* default command-line prompt */
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95
96const char usage[] = "usage: %s [-] [-sx] [-p string] [name]\n";
97
98/* ed: line editor */
99int
b5744197 100main(int argc, char **argv)
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101{
102 int c, n;
103 long status = 0;
104#if __GNUC__
105 /* Avoid longjmp clobbering */
106 (void) &argc;
107 (void) &argv;
108#endif
109
57fed2af 110 setlocale(LC_ALL, "");
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111
112 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
113top:
114 while ((c = getopt(argc, argv, "p:sx")) != -1)
115 switch(c) {
116 case 'p': /* set prompt */
117 prompt = optarg;
118 break;
119 case 's': /* run script */
120 scripted = 1;
121 break;
122 case 'x': /* use crypt */
123#ifdef DES
124 des = get_keyword();
125#else
126 fprintf(stderr, "crypt unavailable\n?\n");
127#endif
128 break;
129
130 default:
131 fprintf(stderr, usage, argv[0]);
132 exit(1);
133 }
134 argv += optind;
135 argc -= optind;
136 if (argc && **argv == '-') {
137 scripted = 1;
138 if (argc > 1) {
139 optind = 1;
140 goto top;
141 }
142 argv++;
143 argc--;
144 }
145 /* assert: reliable signals! */
146#ifdef SIGWINCH
147 handle_winch(SIGWINCH);
148 if (isatty(0)) signal(SIGWINCH, handle_winch);
149#endif
150 signal(SIGHUP, signal_hup);
151 signal(SIGQUIT, SIG_IGN);
152 signal(SIGINT, signal_int);
153#ifdef _POSIX_SOURCE
154 if ((status = sigsetjmp(env, 1)))
155#else
156 if ((status = setjmp(env)))
157#endif
158 {
159 fputs("\n?\n", stderr);
160 sprintf(errmsg, "interrupt");
161 } else {
162 init_buffers();
163 sigactive = 1; /* enable signal handlers */
164 if (argc && **argv && is_legal_filename(*argv)) {
165 if (read_file(*argv, 0) < 0 && !isatty(0))
166 quit(2);
167 else if (**argv != '!')
168 if (strlcpy(old_filename, *argv, sizeof(old_filename))
169 >= sizeof(old_filename))
170 quit(2);
171 } else if (argc) {
172 fputs("?\n", stderr);
173 if (**argv == '\0')
174 sprintf(errmsg, "invalid filename");
175 if (!isatty(0))
176 quit(2);
177 }
178 }
179 for (;;) {
180 if (status < 0 && garrulous)
181 fprintf(stderr, "%s\n", errmsg);
182 if (prompt) {
183 printf("%s", prompt);
184 fflush(stdout);
185 }
186 if ((n = get_tty_line()) < 0) {
187 status = ERR;
188 continue;
189 } else if (n == 0) {
190 if (modified && !scripted) {
191 fputs("?\n", stderr);
192 sprintf(errmsg, "warning: file modified");
193 if (!isatty(0)) {
194 fprintf(stderr, garrulous ?
195 "script, line %d: %s\n" :
196 "", lineno, errmsg);
197 quit(2);
198 }
199 clearerr(stdin);
200 modified = 0;
201 status = EMOD;
202 continue;
203 } else
204 quit(0);
205 } else if (ibuf[n - 1] != '\n') {
206 /* discard line */
207 sprintf(errmsg, "unexpected end-of-file");
208 clearerr(stdin);
209 status = ERR;
210 continue;
211 }
212 isglobal = 0;
213 if ((status = extract_addr_range()) >= 0 &&
214 (status = exec_command()) >= 0)
215 if (!status ||
216 (status = display_lines(current_addr, current_addr,
217 status)) >= 0)
218 continue;
219 switch (status) {
220 case EOF:
221 quit(0);
222 case EMOD:
223 modified = 0;
224 fputs("?\n", stderr); /* give warning */
225 sprintf(errmsg, "warning: file modified");
226 if (!isatty(0)) {
227 fprintf(stderr, garrulous ?
228 "script, line %d: %s\n" :
229 "", lineno, errmsg);
230 quit(2);
231 }
232 break;
233 case FATAL:
234 if (!isatty(0))
235 fprintf(stderr, garrulous ?
236 "script, line %d: %s\n" : "",
237 lineno, errmsg);
238 else
239 fprintf(stderr, garrulous ? "%s\n" : "",
240 errmsg);
241 quit(3);
242 default:
243 fputs("?\n", stderr);
244 if (!isatty(0)) {
245 fprintf(stderr, garrulous ?
246 "script, line %d: %s\n" : "",
247 lineno, errmsg);
248 quit(2);
249 }
250 break;
251 }
252 }
253 /*NOTREACHED*/
254}
255
256long first_addr, second_addr, addr_cnt;
257
258/* extract_addr_range: get line addresses from the command buffer until an
259 illegal address is seen; return status */
260int
b5744197 261extract_addr_range(void)
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262{
263 long addr;
264
265 addr_cnt = 0;
266 first_addr = second_addr = current_addr;
267 while ((addr = next_addr()) >= 0) {
268 addr_cnt++;
269 first_addr = second_addr;
270 second_addr = addr;
271 if (*ibufp != ',' && *ibufp != ';')
272 break;
273 else if (*ibufp++ == ';')
274 current_addr = addr;
275 }
276 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
277 first_addr = second_addr;
278 return (addr == ERR) ? ERR : 0;
279}
280
281
282#define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
283
284#define MUST_BE_FIRST() \
285 if (!first) { sprintf(errmsg, "invalid address"); return ERR; }
286
287/* next_addr: return the next line address in the command buffer */
288long
b5744197 289next_addr(void)
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290{
291 char *hd;
292 long addr = current_addr;
293 long n;
294 int first = 1;
295 int c;
296
297 SKIP_BLANKS();
298 for (hd = ibufp;; first = 0)
299 switch (c = *ibufp) {
300 case '+':
301 case '\t':
302 case ' ':
303 case '-':
304 case '^':
305 ibufp++;
306 SKIP_BLANKS();
307 if (isdigit((unsigned char)*ibufp)) {
308 STRTOL(n, ibufp);
309 addr += (c == '-' || c == '^') ? -n : n;
310 } else if (!isspace((unsigned char)c))
311 addr += (c == '-' || c == '^') ? -1 : 1;
312 break;
313 case '0': case '1': case '2':
314 case '3': case '4': case '5':
315 case '6': case '7': case '8': case '9':
316 MUST_BE_FIRST();
317 STRTOL(addr, ibufp);
318 break;
319 case '.':
320 case '$':
321 MUST_BE_FIRST();
322 ibufp++;
323 addr = (c == '.') ? current_addr : addr_last;
324 break;
325 case '/':
326 case '?':
327 MUST_BE_FIRST();
328 if ((addr = get_matching_node_addr(
329 get_compiled_pattern(), c == '/')) < 0)
330 return ERR;
331 else if (c == *ibufp)
332 ibufp++;
333 break;
334 case '\'':
335 MUST_BE_FIRST();
336 ibufp++;
337 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
338 return ERR;
339 break;
340 case '%':
341 case ',':
342 case ';':
343 if (first) {
344 ibufp++;
345 addr_cnt++;
346 second_addr = (c == ';') ? current_addr : 1;
347 addr = addr_last;
348 break;
349 }
350 /* FALL THROUGH */
351 default:
352 if (ibufp == hd)
353 return EOF;
354 else if (addr < 0 || addr_last < addr) {
355 sprintf(errmsg, "invalid address");
356 return ERR;
357 } else
358 return addr;
359 }
360 /* NOTREACHED */
361}
362
363
364#ifdef BACKWARDS
365/* GET_THIRD_ADDR: get a legal address from the command buffer */
366#define GET_THIRD_ADDR(addr) \
367{ \
368 long ol1, ol2; \
369\
370 ol1 = first_addr, ol2 = second_addr; \
371 if (extract_addr_range() < 0) \
372 return ERR; \
373 else if (addr_cnt == 0) { \
374 sprintf(errmsg, "destination expected"); \
375 return ERR; \
376 } else if (second_addr < 0 || addr_last < second_addr) { \
377 sprintf(errmsg, "invalid address"); \
378 return ERR; \
379 } \
380 addr = second_addr; \
381 first_addr = ol1, second_addr = ol2; \
382}
383#else /* BACKWARDS */
384/* GET_THIRD_ADDR: get a legal address from the command buffer */
385#define GET_THIRD_ADDR(addr) \
386{ \
387 long ol1, ol2; \
388\
389 ol1 = first_addr, ol2 = second_addr; \
390 if (extract_addr_range() < 0) \
391 return ERR; \
392 if (second_addr < 0 || addr_last < second_addr) { \
393 sprintf(errmsg, "invalid address"); \
394 return ERR; \
395 } \
396 addr = second_addr; \
397 first_addr = ol1, second_addr = ol2; \
398}
399#endif
400
401
402/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
403#define GET_COMMAND_SUFFIX() { \
404 int done = 0; \
405 do { \
406 switch(*ibufp) { \
407 case 'p': \
408 gflag |= GPR, ibufp++; \
409 break; \
410 case 'l': \
411 gflag |= GLS, ibufp++; \
412 break; \
413 case 'n': \
414 gflag |= GNP, ibufp++; \
415 break; \
416 default: \
417 done++; \
418 } \
419 } while (!done); \
420 if (*ibufp++ != '\n') { \
421 sprintf(errmsg, "invalid command suffix"); \
422 return ERR; \
423 } \
424}
425
426
427/* sflags */
428#define SGG 001 /* complement previous global substitute suffix */
429#define SGP 002 /* complement previous print suffix */
430#define SGR 004 /* use last regex instead of last pat */
431#define SGF 010 /* repeat last substitution */
432
433int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
434
435long rows = 22; /* scroll length: ws_row - 2 */
436
437/* exec_command: execute the next command in command buffer; return print
438 request, if any */
439int
b5744197 440exec_command(void)
984263bc 441{
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MD
442 static pattern_t *pat = NULL;
443 static int sgflag = 0;
444 static long sgnum = 0;
445
446 pattern_t *tpat;
447 char *fnp;
448 int gflag = 0;
449 int sflags = 0;
450 long addr = 0;
451 int n = 0;
452 int c;
453
454 SKIP_BLANKS();
455 switch(c = *ibufp++) {
456 case 'a':
457 GET_COMMAND_SUFFIX();
458 if (!isglobal) clear_undo_stack();
459 if (append_lines(second_addr) < 0)
460 return ERR;
461 break;
462 case 'c':
463 if (check_addr_range(current_addr, current_addr) < 0)
464 return ERR;
465 GET_COMMAND_SUFFIX();
466 if (!isglobal) clear_undo_stack();
467 if (delete_lines(first_addr, second_addr) < 0 ||
468 append_lines(current_addr) < 0)
469 return ERR;
470 break;
471 case 'd':
472 if (check_addr_range(current_addr, current_addr) < 0)
473 return ERR;
474 GET_COMMAND_SUFFIX();
475 if (!isglobal) clear_undo_stack();
476 if (delete_lines(first_addr, second_addr) < 0)
477 return ERR;
478 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
479 current_addr = addr;
480 break;
481 case 'e':
482 if (modified && !scripted)
483 return EMOD;
484 /* fall through */
485 case 'E':
486 if (addr_cnt > 0) {
487 sprintf(errmsg, "unexpected address");
488 return ERR;
489 } else if (!isspace((unsigned char)*ibufp)) {
490 sprintf(errmsg, "unexpected command suffix");
491 return ERR;
492 } else if ((fnp = get_filename()) == NULL)
493 return ERR;
494 GET_COMMAND_SUFFIX();
495 if (delete_lines(1, addr_last) < 0)
496 return ERR;
497 clear_undo_stack();
498 if (close_sbuf() < 0)
499 return ERR;
500 else if (open_sbuf() < 0)
501 return FATAL;
502 if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
503#ifdef BACKWARDS
504 if (*fnp == '\0' && *old_filename == '\0') {
505 sprintf(errmsg, "no current filename");
506 return ERR;
507 }
508#endif
509 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
510 return ERR;
511 clear_undo_stack();
512 modified = 0;
513 u_current_addr = u_addr_last = -1;
514 break;
515 case 'f':
516 if (addr_cnt > 0) {
517 sprintf(errmsg, "unexpected address");
518 return ERR;
519 } else if (!isspace((unsigned char)*ibufp)) {
520 sprintf(errmsg, "unexpected command suffix");
521 return ERR;
522 } else if ((fnp = get_filename()) == NULL)
523 return ERR;
524 else if (*fnp == '!') {
525 sprintf(errmsg, "invalid redirection");
526 return ERR;
527 }
528 GET_COMMAND_SUFFIX();
529 if (*fnp) strcpy(old_filename, fnp);
530 printf("%s\n", strip_escapes(old_filename));
531 break;
532 case 'g':
533 case 'v':
534 case 'G':
535 case 'V':
536 if (isglobal) {
537 sprintf(errmsg, "cannot nest global commands");
538 return ERR;
539 } else if (check_addr_range(1, addr_last) < 0)
540 return ERR;
541 else if (build_active_list(c == 'g' || c == 'G') < 0)
542 return ERR;
543 else if ((n = (c == 'G' || c == 'V')))
544 GET_COMMAND_SUFFIX();
545 isglobal++;
546 if (exec_global(n, gflag) < 0)
547 return ERR;
548 break;
549 case 'h':
550 if (addr_cnt > 0) {
551 sprintf(errmsg, "unexpected address");
552 return ERR;
553 }
554 GET_COMMAND_SUFFIX();
555 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
556 break;
557 case 'H':
558 if (addr_cnt > 0) {
559 sprintf(errmsg, "unexpected address");
560 return ERR;
561 }
562 GET_COMMAND_SUFFIX();
563 if ((garrulous = 1 - garrulous) && *errmsg)
564 fprintf(stderr, "%s\n", errmsg);
565 break;
566 case 'i':
567 if (second_addr == 0) {
568 sprintf(errmsg, "invalid address");
569 return ERR;
570 }
571 GET_COMMAND_SUFFIX();
572 if (!isglobal) clear_undo_stack();
573 if (append_lines(second_addr - 1) < 0)
574 return ERR;
575 break;
576 case 'j':
577 if (check_addr_range(current_addr, current_addr + 1) < 0)
578 return ERR;
579 GET_COMMAND_SUFFIX();
580 if (!isglobal) clear_undo_stack();
581 if (first_addr != second_addr &&
582 join_lines(first_addr, second_addr) < 0)
583 return ERR;
584 break;
585 case 'k':
586 c = *ibufp++;
587 if (second_addr == 0) {
588 sprintf(errmsg, "invalid address");
589 return ERR;
590 }
591 GET_COMMAND_SUFFIX();
592 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
593 return ERR;
594 break;
595 case 'l':
596 if (check_addr_range(current_addr, current_addr) < 0)
597 return ERR;
598 GET_COMMAND_SUFFIX();
599 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
600 return ERR;
601 gflag = 0;
602 break;
603 case 'm':
604 if (check_addr_range(current_addr, current_addr) < 0)
605 return ERR;
606 GET_THIRD_ADDR(addr);
607 if (first_addr <= addr && addr < second_addr) {
608 sprintf(errmsg, "invalid destination");
609 return ERR;
610 }
611 GET_COMMAND_SUFFIX();
612 if (!isglobal) clear_undo_stack();
613 if (move_lines(addr) < 0)
614 return ERR;
615 break;
616 case 'n':
617 if (check_addr_range(current_addr, current_addr) < 0)
618 return ERR;
619 GET_COMMAND_SUFFIX();
620 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
621 return ERR;
622 gflag = 0;
623 break;
624 case 'p':
625 if (check_addr_range(current_addr, current_addr) < 0)
626 return ERR;
627 GET_COMMAND_SUFFIX();
628 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
629 return ERR;
630 gflag = 0;
631 break;
632 case 'P':
633 if (addr_cnt > 0) {
634 sprintf(errmsg, "unexpected address");
635 return ERR;
636 }
637 GET_COMMAND_SUFFIX();
638 prompt = prompt ? NULL : optarg ? optarg : dps;
639 break;
640 case 'q':
641 case 'Q':
642 if (addr_cnt > 0) {
643 sprintf(errmsg, "unexpected address");
644 return ERR;
645 }
646 GET_COMMAND_SUFFIX();
647 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
648 break;
649 case 'r':
650 if (!isspace((unsigned char)*ibufp)) {
651 sprintf(errmsg, "unexpected command suffix");
652 return ERR;
653 } else if (addr_cnt == 0)
654 second_addr = addr_last;
655 if ((fnp = get_filename()) == NULL)
656 return ERR;
657 GET_COMMAND_SUFFIX();
658 if (!isglobal) clear_undo_stack();
659 if (*old_filename == '\0' && *fnp != '!')
660 strcpy(old_filename, fnp);
661#ifdef BACKWARDS
662 if (*fnp == '\0' && *old_filename == '\0') {
663 sprintf(errmsg, "no current filename");
664 return ERR;
665 }
666#endif
667 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
668 return ERR;
669 else if (addr && addr != addr_last)
670 modified = 1;
671 break;
672 case 's':
673 do {
674 switch(*ibufp) {
675 case '\n':
676 sflags |=SGF;
677 break;
678 case 'g':
679 sflags |= SGG;
680 ibufp++;
681 break;
682 case 'p':
683 sflags |= SGP;
684 ibufp++;
685 break;
686 case 'r':
687 sflags |= SGR;
688 ibufp++;
689 break;
690 case '0': case '1': case '2': case '3': case '4':
691 case '5': case '6': case '7': case '8': case '9':
692 STRTOL(sgnum, ibufp);
693 sflags |= SGF;
694 sgflag &= ~GSG; /* override GSG */
695 break;
696 default:
697 if (sflags) {
698 sprintf(errmsg, "invalid command suffix");
699 return ERR;
700 }
701 }
702 } while (sflags && *ibufp != '\n');
703 if (sflags && !pat) {
704 sprintf(errmsg, "no previous substitution");
705 return ERR;
706 } else if (sflags & SGG)
707 sgnum = 0; /* override numeric arg */
708 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
709 sprintf(errmsg, "invalid pattern delimiter");
710 return ERR;
711 }
712 tpat = pat;
713 SPL1();
714 if ((!sflags || (sflags & SGR)) &&
715 (tpat = get_compiled_pattern()) == NULL) {
716 SPL0();
717 return ERR;
718 } else if (tpat != pat) {
719 if (pat) {
720 regfree(pat);
721 free(pat);
722 }
723 pat = tpat;
724 patlock = 1; /* reserve pattern */
725 }
726 SPL0();
727 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
728 return ERR;
729 else if (isglobal)
730 sgflag |= GLB;
731 else
732 sgflag &= ~GLB;
733 if (sflags & SGG)
734 sgflag ^= GSG;
735 if (sflags & SGP)
736 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
737 do {
738 switch(*ibufp) {
739 case 'p':
740 sgflag |= GPR, ibufp++;
741 break;
742 case 'l':
743 sgflag |= GLS, ibufp++;
744 break;
745 case 'n':
746 sgflag |= GNP, ibufp++;
747 break;
748 default:
749 n++;
750 }
751 } while (!n);
752 if (check_addr_range(current_addr, current_addr) < 0)
753 return ERR;
754 GET_COMMAND_SUFFIX();
755 if (!isglobal) clear_undo_stack();
756 if (search_and_replace(pat, sgflag, sgnum) < 0)
757 return ERR;
758 break;
759 case 't':
760 if (check_addr_range(current_addr, current_addr) < 0)
761 return ERR;
762 GET_THIRD_ADDR(addr);
763 GET_COMMAND_SUFFIX();
764 if (!isglobal) clear_undo_stack();
765 if (copy_lines(addr) < 0)
766 return ERR;
767 break;
768 case 'u':
769 if (addr_cnt > 0) {
770 sprintf(errmsg, "unexpected address");
771 return ERR;
772 }
773 GET_COMMAND_SUFFIX();
774 if (pop_undo_stack() < 0)
775 return ERR;
776 break;
777 case 'w':
778 case 'W':
779 if ((n = *ibufp) == 'q' || n == 'Q') {
780 gflag = EOF;
781 ibufp++;
782 }
783 if (!isspace((unsigned char)*ibufp)) {
784 sprintf(errmsg, "unexpected command suffix");
785 return ERR;
786 } else if ((fnp = get_filename()) == NULL)
787 return ERR;
788 if (addr_cnt == 0 && !addr_last)
789 first_addr = second_addr = 0;
790 else if (check_addr_range(1, addr_last) < 0)
791 return ERR;
792 GET_COMMAND_SUFFIX();
793 if (*old_filename == '\0' && *fnp != '!')
794 strcpy(old_filename, fnp);
795#ifdef BACKWARDS
796 if (*fnp == '\0' && *old_filename == '\0') {
797 sprintf(errmsg, "no current filename");
798 return ERR;
799 }
800#endif
801 if ((addr = write_file(*fnp ? fnp : old_filename,
802 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
803 return ERR;
804 else if (addr == addr_last)
805 modified = 0;
806 else if (modified && !scripted && n == 'q')
807 gflag = EMOD;
808 break;
809 case 'x':
810 if (addr_cnt > 0) {
811 sprintf(errmsg, "unexpected address");
812 return ERR;
813 }
814 GET_COMMAND_SUFFIX();
815#ifdef DES
816 des = get_keyword();
817#else
818 sprintf(errmsg, "crypt unavailable");
819 return ERR;
820#endif
821 break;
822 case 'z':
823#ifdef BACKWARDS
824 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
825#else
826 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
827#endif
828 return ERR;
829 else if ('0' < *ibufp && *ibufp <= '9')
830 STRTOL(rows, ibufp);
831 GET_COMMAND_SUFFIX();
832 if (display_lines(second_addr, min(addr_last,
833 second_addr + rows), gflag) < 0)
834 return ERR;
835 gflag = 0;
836 break;
837 case '=':
838 GET_COMMAND_SUFFIX();
839 printf("%ld\n", addr_cnt ? second_addr : addr_last);
840 break;
841 case '!':
842 if (addr_cnt > 0) {
843 sprintf(errmsg, "unexpected address");
844 return ERR;
845 } else if ((sflags = get_shell_command()) < 0)
846 return ERR;
847 GET_COMMAND_SUFFIX();
848 if (sflags) printf("%s\n", shcmd + 1);
849 system(shcmd + 1);
850 if (!scripted) printf("!\n");
851 break;
852 case '\n':
853#ifdef BACKWARDS
854 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
855#else
856 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
857#endif
858 || display_lines(second_addr, second_addr, 0) < 0)
859 return ERR;
860 break;
861 default:
862 sprintf(errmsg, "unknown command");
863 return ERR;
864 }
865 return gflag;
866}
867
868
869/* check_addr_range: return status of address range check */
870int
b5744197 871check_addr_range(long n, long m)
984263bc
MD
872{
873 if (addr_cnt == 0) {
874 first_addr = n;
875 second_addr = m;
876 }
877 if (first_addr > second_addr || 1 > first_addr ||
878 second_addr > addr_last) {
879 sprintf(errmsg, "invalid address");
880 return ERR;
881 }
882 return 0;
883}
884
885
886/* get_matching_node_addr: return the address of the next line matching a
887 pattern in a given direction. wrap around begin/end of editor buffer if
888 necessary */
889long
b5744197 890get_matching_node_addr(pattern_t *pat, int dir)
984263bc
MD
891{
892 char *s;
893 long n = current_addr;
894 line_t *lp;
895
896 if (!pat) return ERR;
897 do {
898 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
899 lp = get_addressed_line_node(n);
900 if ((s = get_sbuf_line(lp)) == NULL)
901 return ERR;
902 if (isbinary)
903 NUL_TO_NEWLINE(s, lp->len);
904 if (!regexec(pat, s, 0, NULL, 0))
905 return n;
906 }
907 } while (n != current_addr);
908 sprintf(errmsg, "no match");
909 return ERR;
910}
911
912
913/* get_filename: return pointer to copy of filename in the command buffer */
914char *
b5744197 915get_filename(void)
984263bc
MD
916{
917 static char *file = NULL;
918 static int filesz = 0;
919
920 int n;
921
922 if (*ibufp != '\n') {
923 SKIP_BLANKS();
924 if (*ibufp == '\n') {
925 sprintf(errmsg, "invalid filename");
926 return NULL;
927 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
928 return NULL;
929 else if (*ibufp == '!') {
930 ibufp++;
931 if ((n = get_shell_command()) < 0)
932 return NULL;
933 if (n)
934 printf("%s\n", shcmd + 1);
935 return shcmd;
936 } else if (n > PATH_MAX - 1) {
937 sprintf(errmsg, "filename too long");
938 return NULL;
939 }
940 }
941#ifndef BACKWARDS
942 else if (*old_filename == '\0') {
943 sprintf(errmsg, "no current filename");
944 return NULL;
945 }
946#endif
947 REALLOC(file, filesz, PATH_MAX, NULL);
948 for (n = 0; *ibufp != '\n';)
949 file[n++] = *ibufp++;
950 file[n] = '\0';
951 return is_legal_filename(file) ? file : NULL;
952}
953
954
955/* get_shell_command: read a shell command from stdin; return substitution
956 status */
957int
b5744197 958get_shell_command(void)
984263bc
MD
959{
960 static char *buf = NULL;
961 static int n = 0;
962
963 char *s; /* substitution char pointer */
964 int i = 0;
965 int j = 0;
966
967 if (red) {
968 sprintf(errmsg, "shell access restricted");
969 return ERR;
970 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
971 return ERR;
972 REALLOC(buf, n, j + 1, ERR);
973 buf[i++] = '!'; /* prefix command w/ bang */
974 while (*ibufp != '\n')
975 switch (*ibufp) {
976 default:
977 REALLOC(buf, n, i + 2, ERR);
978 buf[i++] = *ibufp;
979 if (*ibufp++ == '\\')
980 buf[i++] = *ibufp++;
981 break;
982 case '!':
983 if (s != ibufp) {
984 REALLOC(buf, n, i + 1, ERR);
985 buf[i++] = *ibufp++;
986 }
987#ifdef BACKWARDS
988 else if (shcmd == NULL || *(shcmd + 1) == '\0')
989#else
990 else if (shcmd == NULL)
991#endif
992 {
993 sprintf(errmsg, "no previous command");
994 return ERR;
995 } else {
996 REALLOC(buf, n, i + shcmdi, ERR);
997 for (s = shcmd + 1; s < shcmd + shcmdi;)
998 buf[i++] = *s++;
999 s = ibufp++;
1000 }
1001 break;
1002 case '%':
1003 if (*old_filename == '\0') {
1004 sprintf(errmsg, "no current filename");
1005 return ERR;
1006 }
1007 j = strlen(s = strip_escapes(old_filename));
1008 REALLOC(buf, n, i + j, ERR);
1009 while (j--)
1010 buf[i++] = *s++;
1011 s = ibufp++;
1012 break;
1013 }
1014 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1015 memcpy(shcmd, buf, i);
1016 shcmd[shcmdi = i] = '\0';
1017 return *s == '!' || *s == '%';
1018}
1019
1020
1021/* append_lines: insert text from stdin to after line n; stop when either a
1022 single period is read or EOF; return status */
1023int
b5744197 1024append_lines(long n)
984263bc
MD
1025{
1026 int l;
1027 char *lp = ibuf;
1028 char *eot;
1029 undo_t *up = NULL;
1030
1031 for (current_addr = n;;) {
1032 if (!isglobal) {
1033 if ((l = get_tty_line()) < 0)
1034 return ERR;
1035 else if (l == 0 || ibuf[l - 1] != '\n') {
1036 clearerr(stdin);
1037 return l ? EOF : 0;
1038 }
1039 lp = ibuf;
1040 } else if (*(lp = ibufp) == '\0')
1041 return 0;
1042 else {
1043 while (*ibufp++ != '\n')
1044 ;
1045 l = ibufp - lp;
1046 }
1047 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1048 return 0;
1049 }
1050 eot = lp + l;
1051 SPL1();
1052 do {
1053 if ((lp = put_sbuf_line(lp)) == NULL) {
1054 SPL0();
1055 return ERR;
1056 } else if (up)
1057 up->t = get_addressed_line_node(current_addr);
1058 else if ((up = push_undo_stack(UADD, current_addr,
1059 current_addr)) == NULL) {
1060 SPL0();
1061 return ERR;
1062 }
1063 } while (lp != eot);
1064 modified = 1;
1065 SPL0();
1066 }
1067 /* NOTREACHED */
1068}
1069
1070
1071/* join_lines: replace a range of lines with the joined text of those lines */
1072int
b5744197 1073join_lines(long from, long to)
984263bc
MD
1074{
1075 static char *buf = NULL;
1076 static int n;
1077
1078 char *s;
1079 int size = 0;
1080 line_t *bp, *ep;
1081
1082 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1083 bp = get_addressed_line_node(from);
1084 for (; bp != ep; bp = bp->q_forw) {
1085 if ((s = get_sbuf_line(bp)) == NULL)
1086 return ERR;
1087 REALLOC(buf, n, size + bp->len, ERR);
1088 memcpy(buf + size, s, bp->len);
1089 size += bp->len;
1090 }
1091 REALLOC(buf, n, size + 2, ERR);
1092 memcpy(buf + size, "\n", 2);
1093 if (delete_lines(from, to) < 0)
1094 return ERR;
1095 current_addr = from - 1;
1096 SPL1();
1097 if (put_sbuf_line(buf) == NULL ||
1098 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1099 SPL0();
1100 return ERR;
1101 }
1102 modified = 1;
1103 SPL0();
1104 return 0;
1105}
1106
1107
1108/* move_lines: move a range of lines */
1109int
b5744197 1110move_lines(long addr)
984263bc
MD
1111{
1112 line_t *b1, *a1, *b2, *a2;
1113 long n = INC_MOD(second_addr, addr_last);
1114 long p = first_addr - 1;
1115 int done = (addr == first_addr - 1 || addr == second_addr);
1116
1117 SPL1();
1118 if (done) {
1119 a2 = get_addressed_line_node(n);
1120 b2 = get_addressed_line_node(p);
1121 current_addr = second_addr;
1122 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1123 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1124 SPL0();
1125 return ERR;
1126 } else {
1127 a1 = get_addressed_line_node(n);
1128 if (addr < first_addr) {
1129 b1 = get_addressed_line_node(p);
1130 b2 = get_addressed_line_node(addr);
1131 /* this get_addressed_line_node last! */
1132 } else {
1133 b2 = get_addressed_line_node(addr);
1134 b1 = get_addressed_line_node(p);
1135 /* this get_addressed_line_node last! */
1136 }
1137 a2 = b2->q_forw;
1138 REQUE(b2, b1->q_forw);
1139 REQUE(a1->q_back, a2);
1140 REQUE(b1, a1);
1141 current_addr = addr + ((addr < first_addr) ?
1142 second_addr - first_addr + 1 : 0);
1143 }
1144 if (isglobal)
1145 unset_active_nodes(b2->q_forw, a2);
1146 modified = 1;
1147 SPL0();
1148 return 0;
1149}
1150
1151
1152/* copy_lines: copy a range of lines; return status */
1153int
b5744197 1154copy_lines(long addr)
984263bc
MD
1155{
1156 line_t *lp, *np = get_addressed_line_node(first_addr);
1157 undo_t *up = NULL;
1158 long n = second_addr - first_addr + 1;
1159 long m = 0;
1160
1161 current_addr = addr;
1162 if (first_addr <= addr && addr < second_addr) {
1163 n = addr - first_addr + 1;
1164 m = second_addr - addr;
1165 }
1166 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1167 for (; n-- > 0; np = np->q_forw) {
1168 SPL1();
1169 if ((lp = dup_line_node(np)) == NULL) {
1170 SPL0();
1171 return ERR;
1172 }
1173 add_line_node(lp);
1174 if (up)
1175 up->t = lp;
1176 else if ((up = push_undo_stack(UADD, current_addr,
1177 current_addr)) == NULL) {
1178 SPL0();
1179 return ERR;
1180 }
1181 modified = 1;
1182 SPL0();
1183 }
1184 return 0;
1185}
1186
1187
1188/* delete_lines: delete a range of lines */
1189int
b5744197 1190delete_lines(long from, long to)
984263bc
MD
1191{
1192 line_t *n, *p;
1193
1194 SPL1();
1195 if (push_undo_stack(UDEL, from, to) == NULL) {
1196 SPL0();
1197 return ERR;
1198 }
1199 n = get_addressed_line_node(INC_MOD(to, addr_last));
1200 p = get_addressed_line_node(from - 1);
1201 /* this get_addressed_line_node last! */
1202 if (isglobal)
1203 unset_active_nodes(p->q_forw, n);
1204 REQUE(p, n);
1205 addr_last -= to - from + 1;
1206 current_addr = from - 1;
1207 modified = 1;
1208 SPL0();
1209 return 0;
1210}
1211
1212
1213/* display_lines: print a range of lines to stdout */
1214int
b5744197 1215display_lines(long from, long to, int gflag)
984263bc
MD
1216{
1217 line_t *bp;
1218 line_t *ep;
1219 char *s;
1220
1221 if (!from) {
1222 sprintf(errmsg, "invalid address");
1223 return ERR;
1224 }
1225 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1226 bp = get_addressed_line_node(from);
1227 for (; bp != ep; bp = bp->q_forw) {
1228 if ((s = get_sbuf_line(bp)) == NULL)
1229 return ERR;
1230 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1231 return ERR;
1232 }
1233 return 0;
1234}
1235
1236
1237#define MAXMARK 26 /* max number of marks */
1238
1239line_t *mark[MAXMARK]; /* line markers */
1240int markno; /* line marker count */
1241
1242/* mark_line_node: set a line node mark */
1243int
b5744197 1244mark_line_node(line_t *lp, int n)
984263bc
MD
1245{
1246 if (!islower((unsigned char)n)) {
1247 sprintf(errmsg, "invalid mark character");
1248 return ERR;
1249 } else if (mark[n - 'a'] == NULL)
1250 markno++;
1251 mark[n - 'a'] = lp;
1252 return 0;
1253}
1254
1255
1256/* get_marked_node_addr: return address of a marked line */
1257long
b5744197 1258get_marked_node_addr(int n)
984263bc
MD
1259{
1260 if (!islower((unsigned char)n)) {
1261 sprintf(errmsg, "invalid mark character");
1262 return ERR;
1263 }
1264 return get_line_node_addr(mark[n - 'a']);
1265}
1266
1267
1268/* unmark_line_node: clear line node mark */
1269void
b5744197 1270unmark_line_node(line_t *lp)
984263bc
MD
1271{
1272 int i;
1273
1274 for (i = 0; markno && i < MAXMARK; i++)
1275 if (mark[i] == lp) {
1276 mark[i] = NULL;
1277 markno--;
1278 }
1279}
1280
1281
1282/* dup_line_node: return a pointer to a copy of a line node */
1283line_t *
b5744197 1284dup_line_node(line_t *lp)
984263bc
MD
1285{
1286 line_t *np;
1287
1288 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1289 fprintf(stderr, "%s\n", strerror(errno));
1290 sprintf(errmsg, "out of memory");
1291 return NULL;
1292 }
1293 np->seek = lp->seek;
1294 np->len = lp->len;
1295 return np;
1296}
1297
1298
1299/* has_trailing_escape: return the parity of escapes preceding a character
1300 in a string */
1301int
b5744197 1302has_trailing_escape(char *s, char *t)
984263bc
MD
1303{
1304 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1305}
1306
1307
1308/* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1309char *
c443019b 1310strip_escapes(const char *s)
984263bc
MD
1311{
1312 static char *file = NULL;
1313 static int filesz = 0;
1314
1315 int i = 0;
1316
1317 REALLOC(file, filesz, PATH_MAX, NULL);
1318 while (i < filesz - 1 /* Worry about a possible trailing escape */
1319 && (file[i++] = (*s == '\\') ? *++s : *s))
1320 s++;
1321 return file;
1322}
1323
1324
1325void
b5744197 1326signal_hup(int signo)
984263bc
MD
1327{
1328 if (mutex)
1329 sigflags |= (1 << (signo - 1));
1330 else
1331 handle_hup(signo);
1332}
1333
1334
1335void
b5744197 1336signal_int(int signo)
984263bc
MD
1337{
1338 if (mutex)
1339 sigflags |= (1 << (signo - 1));
1340 else
1341 handle_int(signo);
1342}
1343
1344
1345void
b5744197 1346handle_hup(int signo)
984263bc
MD
1347{
1348 char *hup = NULL; /* hup filename */
1349 char *s;
1350 int n;
1351
1352 if (!sigactive)
1353 quit(1);
1354 sigflags &= ~(1 << (signo - 1));
1355 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 &&
1356 (s = getenv("HOME")) != NULL &&
1357 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1358 (hup = (char *) malloc(n + 10)) != NULL) {
1359 strcpy(hup, s);
1360 if (hup[n - 1] != '/')
1361 hup[n] = '/', hup[n+1] = '\0';
1362 strcat(hup, "ed.hup");
1363 write_file(hup, "w", 1, addr_last);
1364 }
1365 quit(2);
1366}
1367
1368
1369void
b5744197 1370handle_int(int signo)
984263bc
MD
1371{
1372 if (!sigactive)
1373 quit(1);
1374 sigflags &= ~(1 << (signo - 1));
1375#ifdef _POSIX_SOURCE
1376 siglongjmp(env, -1);
1377#else
1378 longjmp(env, -1);
1379#endif
1380}
1381
1382
1383int cols = 72; /* wrap column */
1384
1385void
b5744197 1386handle_winch(int signo)
984263bc
MD
1387{
1388 int save_errno = errno;
1389
1390 struct winsize ws; /* window size structure */
1391
1392 sigflags &= ~(1 << (signo - 1));
1393 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1394 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1395 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1396 }
1397 errno = save_errno;
1398}
1399
1400
1401/* is_legal_filename: return a legal filename */
1402int
b5744197 1403is_legal_filename(char *s)
984263bc
MD
1404{
1405 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1406 sprintf(errmsg, "shell access restricted");
1407 return 0;
1408 }
1409 return 1;
1410}