1 /* $OpenBSD: main.c,v 1.68 2022/11/18 14:52:03 millert Exp $ */
2 /* $NetBSD: main.c,v 1.3 1995/03/21 09:04:44 cgd Exp $ */
3
4 /* main.c: This file contains the main control and user-interface routines
5 for the ed line editor. */
6 /*-
7 * Copyright (c) 1993 Andrew Moore, Talke Studio.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*
33 * CREDITS
34 *
35 * This program is based on the editor algorithm described in
36 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
37 * in Pascal," Addison-Wesley, 1981.
38 *
39 * The buffering algorithm is attributed to Rodney Ruddock of
40 * the University of Guelph, Guelph, Ontario.
41 *
42 */
43
44 #include <sys/ioctl.h>
45 #include <sys/stat.h>
46 #include <sys/wait.h>
47
48 #include <ctype.h>
49 #include <err.h>
50 #include <errno.h>
51 #include <limits.h>
52 #include <pwd.h>
53 #include <regex.h>
54 #include <setjmp.h>
55 #include <signal.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <string.h>
59 #include <unistd.h>
60
61 #include "ed.h"
62
63 void signal_hup(int);
64 void signal_int(int);
65 void handle_winch(int);
66
67 static int next_addr(void);
68 static int check_addr_range(int, int);
69 static int get_matching_node_addr(regex_t *, int);
70 static char *get_filename(int);
71 static int get_shell_command(void);
72 static int append_lines(int);
73 static int join_lines(int, int);
74 static int move_lines(int);
75 static int copy_lines(int);
76 static int mark_line_node(line_t *, int);
77 static int get_marked_node_addr(int);
78 static line_t *dup_line_node(line_t *);
79
80 sigjmp_buf env;
81
82 /* static buffers */
83 static char errmsg[PATH_MAX + 40]; /* error message buffer */
84 static char *shcmd; /* shell command buffer */
85 static int shcmdsz; /* shell command buffer size */
86 static int shcmdi; /* shell command buffer index */
87 static char old_filename[PATH_MAX]; /* default filename */
88
89 /* global buffers */
90 char *ibuf; /* ed command-line buffer */
91 int ibufsz; /* ed command-line buffer size */
92 char *ibufp; /* pointer to ed command-line buffer */
93
94 /* global flags */
95 int garrulous = 0; /* if set, print all error messages */
96 int isbinary; /* if set, buffer contains ASCII NULs */
97 int isglobal; /* if set, doing a global command */
98 int modified; /* if set, buffer modified since last write */
99 int scripted = 0; /* if set, suppress diagnostics */
100 int interactive = 0; /* if set, we are in interactive mode */
101
102 volatile sig_atomic_t mutex = 0; /* if set, signals set flags */
103 volatile sig_atomic_t sighup = 0; /* if set, sighup received while mutex set */
104 volatile sig_atomic_t sigint = 0; /* if set, sigint received while mutex set */
105
106 /* if set, signal handlers are enabled */
107 volatile sig_atomic_t sigactive = 0;
108
109 int current_addr; /* current address in editor buffer */
110 int addr_last; /* last address in editor buffer */
111 int lineno; /* script line number */
112 static char *prompt; /* command-line prompt */
113 static char *dps = "*"; /* default command-line prompt */
114
115 static const char usage[] = "usage: %s [-] [-s] [-p string] [file]\n";
116
117 static char *home; /* home directory */
118
119 void
seterrmsg(char * s)120 seterrmsg(char *s)
121 {
122 strlcpy(errmsg, s, sizeof(errmsg));
123 }
124
125 /* ed: line editor */
126 int
main(volatile int argc,char ** volatile argv)127 main(volatile int argc, char ** volatile argv)
128 {
129 int c, n;
130 int status = 0;
131
132 if (pledge("stdio rpath wpath cpath proc exec tty", NULL) == -1)
133 err(1, "pledge");
134
135 home = getenv("HOME");
136
137 top:
138 while ((c = getopt(argc, argv, "p:sx")) != -1)
139 switch (c) {
140 case 'p': /* set prompt */
141 dps = prompt = optarg;
142 break;
143 case 's': /* run script */
144 scripted = 1;
145 break;
146 case 'x': /* use crypt */
147 fprintf(stderr, "crypt unavailable\n?\n");
148 break;
149 default:
150 fprintf(stderr, usage, argv[0]);
151 exit(1);
152 }
153 argv += optind;
154 argc -= optind;
155 if (argc && **argv == '-') {
156 scripted = 1;
157 if (argc > 1) {
158 optind = 1;
159 goto top;
160 }
161 argv++;
162 argc--;
163 }
164
165 if (!(interactive = isatty(0))) {
166 struct stat sb;
167
168 /* assert: pipes show up as fifo's when fstat'd */
169 if (fstat(STDIN_FILENO, &sb) || !S_ISFIFO(sb.st_mode)) {
170 if (lseek(STDIN_FILENO, 0, SEEK_CUR)) {
171 interactive = 1;
172 setvbuf(stdout, NULL, _IOLBF, 0);
173 }
174 }
175 }
176
177 /* assert: reliable signals! */
178 if (isatty(STDIN_FILENO)) {
179 handle_winch(SIGWINCH);
180 signal(SIGWINCH, handle_winch);
181 }
182 signal(SIGHUP, signal_hup);
183 signal(SIGQUIT, SIG_IGN);
184 signal(SIGINT, signal_int);
185 if (sigsetjmp(env, 1)) {
186 status = -1;
187 fputs("\n?\n", stdout);
188 seterrmsg("interrupt");
189 } else {
190 init_buffers();
191 sigactive = 1; /* enable signal handlers */
192 if (argc && **argv) {
193 if (read_file(*argv, 0) < 0 && !interactive)
194 quit(2);
195 else if (**argv != '!')
196 strlcpy(old_filename, *argv,
197 sizeof old_filename);
198 } else if (argc) {
199 fputs("?\n", stdout);
200 if (**argv == '\0')
201 seterrmsg("invalid filename");
202 if (!interactive)
203 quit(2);
204 }
205 }
206 for (;;) {
207 if (status < 0 && garrulous)
208 fprintf(stderr, "%s\n", errmsg);
209 if (prompt) {
210 fputs(prompt, stdout);
211 fflush(stdout);
212 }
213 if ((n = get_tty_line()) < 0) {
214 status = ERR;
215 continue;
216 } else if (n == 0) {
217 if (modified && !scripted) {
218 fputs("?\n", stdout);
219 seterrmsg("warning: file modified");
220 if (!interactive) {
221 if (garrulous)
222 fprintf(stderr,
223 "script, line %d: %s\n",
224 lineno, errmsg);
225 quit(2);
226 }
227 clearerr(stdin);
228 modified = 0;
229 status = EMOD;
230 continue;
231 } else
232 quit(0);
233 } else if (ibuf[n - 1] != '\n') {
234 /* discard line */
235 seterrmsg("unexpected end-of-file");
236 clearerr(stdin);
237 status = ERR;
238 continue;
239 }
240 isglobal = 0;
241 if ((status = extract_addr_range()) >= 0 &&
242 (status = exec_command()) >= 0)
243 if (!status || (status &&
244 (status = display_lines(current_addr, current_addr,
245 status)) >= 0))
246 continue;
247 switch (status) {
248 case EOF:
249 quit(0);
250 break;
251 case EMOD:
252 modified = 0;
253 fputs("?\n", stdout); /* give warning */
254 seterrmsg("warning: file modified");
255 if (!interactive) {
256 if (garrulous)
257 fprintf(stderr,
258 "script, line %d: %s\n",
259 lineno, errmsg);
260 quit(2);
261 }
262 break;
263 case FATAL:
264 if (!interactive) {
265 if (garrulous)
266 fprintf(stderr,
267 "script, line %d: %s\n",
268 lineno, errmsg);
269 } else if (garrulous)
270 fprintf(stderr, "%s\n", errmsg);
271 quit(3);
272 break;
273 default:
274 fputs("?\n", stdout);
275 if (!interactive) {
276 if (garrulous)
277 fprintf(stderr,
278 "script, line %d: %s\n",
279 lineno, errmsg);
280 quit(2);
281 }
282 break;
283 }
284 }
285 /*NOTREACHED*/
286 }
287
288 int first_addr, second_addr, addr_cnt;
289
290 /* extract_addr_range: get line addresses from the command buffer until an
291 illegal address is seen; return status */
292 int
extract_addr_range(void)293 extract_addr_range(void)
294 {
295 int addr;
296
297 addr_cnt = 0;
298 first_addr = second_addr = current_addr;
299 while ((addr = next_addr()) >= 0) {
300 addr_cnt++;
301 first_addr = second_addr;
302 second_addr = addr;
303 if (*ibufp != ',' && *ibufp != ';')
304 break;
305 else if (*ibufp++ == ';')
306 current_addr = addr;
307 }
308 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
309 first_addr = second_addr;
310 return (addr == ERR) ? ERR : 0;
311 }
312
313
314 #define SKIP_BLANKS() \
315 do { \
316 while (isspace((unsigned char)*ibufp) && *ibufp != '\n') \
317 ibufp++; \
318 } while (0)
319
320 #define MUST_BE_FIRST() \
321 do { \
322 if (!first) { \
323 seterrmsg("invalid address"); \
324 return ERR; \
325 } \
326 } while (0)
327
328
329 /* next_addr: return the next line address in the command buffer */
330 static int
next_addr(void)331 next_addr(void)
332 {
333 char *hd;
334 int addr = current_addr;
335 int n;
336 int first = 1;
337 int c;
338
339 SKIP_BLANKS();
340 for (hd = ibufp;; first = 0)
341 switch ((c = (unsigned char)*ibufp)) {
342 case '+':
343 case '\t':
344 case ' ':
345 case '-':
346 case '^':
347 ibufp++;
348 SKIP_BLANKS();
349 if (isdigit((unsigned char)*ibufp)) {
350 STRTOI(n, ibufp);
351 addr += (c == '-' || c == '^') ? -n : n;
352 } else if (!isspace(c))
353 addr += (c == '-' || c == '^') ? -1 : 1;
354 break;
355 case '0': case '1': case '2':
356 case '3': case '4': case '5':
357 case '6': case '7': case '8': case '9':
358 MUST_BE_FIRST();
359 STRTOI(addr, ibufp);
360 break;
361 case '.':
362 case '$':
363 MUST_BE_FIRST();
364 ibufp++;
365 addr = (c == '.') ? current_addr : addr_last;
366 break;
367 case '/':
368 case '?':
369 MUST_BE_FIRST();
370 if ((addr = get_matching_node_addr(
371 get_compiled_pattern(), c == '/')) < 0)
372 return ERR;
373 else if (c == *ibufp)
374 ibufp++;
375 break;
376 case '\'':
377 MUST_BE_FIRST();
378 ibufp++;
379 if ((addr = get_marked_node_addr((unsigned char)*ibufp++)) < 0)
380 return ERR;
381 break;
382 case '%':
383 case ',':
384 case ';':
385 if (first) {
386 ibufp++;
387 addr_cnt++;
388 second_addr = (c == ';') ? current_addr : 1;
389 if ((addr = next_addr()) < 0)
390 addr = addr_last;
391 break;
392 }
393 /* FALLTHROUGH */
394 default:
395 if (ibufp == hd)
396 return EOF;
397 else if (addr < 0 || addr_last < addr) {
398 seterrmsg("invalid address");
399 return ERR;
400 } else
401 return addr;
402 }
403 /* NOTREACHED */
404 }
405
406
407 /* GET_THIRD_ADDR: get a legal address from the command buffer */
408 #define GET_THIRD_ADDR(addr) \
409 do { \
410 int ol1, ol2; \
411 \
412 ol1 = first_addr; \
413 ol2 = second_addr; \
414 if (extract_addr_range() < 0) \
415 return ERR; \
416 else if (addr_cnt == 0) { \
417 seterrmsg("destination expected"); \
418 return ERR; \
419 } else if (second_addr < 0 || addr_last < second_addr) { \
420 seterrmsg("invalid address"); \
421 return ERR; \
422 } \
423 addr = second_addr; \
424 first_addr = ol1; \
425 second_addr = ol2; \
426 } while (0)
427
428
429 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
430 #define GET_COMMAND_SUFFIX() \
431 do { \
432 int done = 0; \
433 do { \
434 switch (*ibufp) { \
435 case 'p': \
436 gflag |= GPR; \
437 ibufp++; \
438 break; \
439 case 'l': \
440 gflag |= GLS; \
441 ibufp++; \
442 break; \
443 case 'n': \
444 gflag |= GNP; \
445 ibufp++; \
446 break; \
447 default: \
448 done++; \
449 } \
450 } while (!done); \
451 if (*ibufp++ != '\n') { \
452 seterrmsg("invalid command suffix"); \
453 return ERR; \
454 } \
455 } while (0)
456
457 /* sflags */
458 #define SGG 001 /* complement previous global substitute suffix */
459 #define SGP 002 /* complement previous print suffix */
460 #define SGR 004 /* use last regex instead of last pat */
461 #define SGF 010 /* repeat last substitution */
462
463 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
464
465 volatile sig_atomic_t rows = 22; /* scroll length: ws_row - 2 */
466 volatile sig_atomic_t cols = 72; /* wrap column */
467
468 /* exec_command: execute the next command in command buffer; return print
469 request, if any */
470 int
exec_command(void)471 exec_command(void)
472 {
473 extern int u_current_addr;
474 extern int u_addr_last;
475
476 static regex_t *pat = NULL;
477 static int sgflag = 0;
478 static int sgnum = 0;
479
480 regex_t *tpat;
481 char *fnp;
482 int gflag = 0;
483 int sflags = 0;
484 int addr = 0;
485 int n = 0;
486 int c;
487
488 SKIP_BLANKS();
489 switch ((c = (unsigned char)*ibufp++)) {
490 case 'a':
491 GET_COMMAND_SUFFIX();
492 if (!isglobal) clear_undo_stack();
493 if (append_lines(second_addr) < 0)
494 return ERR;
495 break;
496 case 'c':
497 if (check_addr_range(current_addr, current_addr) < 0)
498 return ERR;
499 GET_COMMAND_SUFFIX();
500 if (!isglobal) clear_undo_stack();
501 if (delete_lines(first_addr, second_addr) < 0 ||
502 append_lines(current_addr) < 0)
503 return ERR;
504 break;
505 case 'd':
506 if (check_addr_range(current_addr, current_addr) < 0)
507 return ERR;
508 GET_COMMAND_SUFFIX();
509 if (!isglobal) clear_undo_stack();
510 if (delete_lines(first_addr, second_addr) < 0)
511 return ERR;
512 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
513 current_addr = addr;
514 break;
515 case 'e':
516 if (modified && !scripted)
517 return EMOD;
518 /* FALLTHROUGH */
519 case 'E':
520 if (addr_cnt > 0) {
521 seterrmsg("unexpected address");
522 return ERR;
523 } else if (!isspace((unsigned char)*ibufp)) {
524 seterrmsg("unexpected command suffix");
525 return ERR;
526 } else if ((fnp = get_filename(1)) == NULL)
527 return ERR;
528 GET_COMMAND_SUFFIX();
529 if (delete_lines(1, addr_last) < 0)
530 return ERR;
531 clear_undo_stack();
532 if (close_sbuf() < 0)
533 return ERR;
534 else if (open_sbuf() < 0)
535 return FATAL;
536 if (read_file(fnp, 0) < 0)
537 return ERR;
538 clear_undo_stack();
539 modified = 0;
540 u_current_addr = u_addr_last = -1;
541 break;
542 case 'f':
543 if (addr_cnt > 0) {
544 seterrmsg("unexpected address");
545 return ERR;
546 } else if (!isspace((unsigned char)*ibufp)) {
547 seterrmsg("unexpected command suffix");
548 return ERR;
549 } else if ((fnp = get_filename(1)) == NULL)
550 return ERR;
551 else if (*fnp == '!') {
552 seterrmsg("invalid redirection");
553 return ERR;
554 }
555 GET_COMMAND_SUFFIX();
556 puts(strip_escapes(fnp));
557 break;
558 case 'g':
559 case 'v':
560 case 'G':
561 case 'V':
562 if (isglobal) {
563 seterrmsg("cannot nest global commands");
564 return ERR;
565 } else if (check_addr_range(1, addr_last) < 0)
566 return ERR;
567 else if (build_active_list(c == 'g' || c == 'G') < 0)
568 return ERR;
569 else if ((n = (c == 'G' || c == 'V')))
570 GET_COMMAND_SUFFIX();
571 isglobal++;
572 if (exec_global(n, gflag) < 0)
573 return ERR;
574 break;
575 case 'h':
576 if (addr_cnt > 0) {
577 seterrmsg("unexpected address");
578 return ERR;
579 }
580 GET_COMMAND_SUFFIX();
581 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
582 break;
583 case 'H':
584 if (addr_cnt > 0) {
585 seterrmsg("unexpected address");
586 return ERR;
587 }
588 GET_COMMAND_SUFFIX();
589 if ((garrulous = 1 - garrulous) && *errmsg)
590 fprintf(stderr, "%s\n", errmsg);
591 break;
592 case 'i':
593 if (second_addr == 0) {
594 second_addr = 1;
595 }
596 GET_COMMAND_SUFFIX();
597 if (!isglobal) clear_undo_stack();
598 if (append_lines(second_addr - 1) < 0)
599 return ERR;
600 break;
601 case 'j':
602 if (check_addr_range(current_addr, current_addr + 1) < 0)
603 return ERR;
604 GET_COMMAND_SUFFIX();
605 if (!isglobal) clear_undo_stack();
606 if (first_addr != second_addr &&
607 join_lines(first_addr, second_addr) < 0)
608 return ERR;
609 break;
610 case 'k':
611 c = (unsigned char)*ibufp++;
612 if (second_addr == 0) {
613 seterrmsg("invalid address");
614 return ERR;
615 }
616 GET_COMMAND_SUFFIX();
617 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
618 return ERR;
619 break;
620 case 'l':
621 if (check_addr_range(current_addr, current_addr) < 0)
622 return ERR;
623 GET_COMMAND_SUFFIX();
624 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
625 return ERR;
626 gflag = 0;
627 break;
628 case 'm':
629 if (check_addr_range(current_addr, current_addr) < 0)
630 return ERR;
631 GET_THIRD_ADDR(addr);
632 if (first_addr <= addr && addr < second_addr) {
633 seterrmsg("invalid destination");
634 return ERR;
635 }
636 GET_COMMAND_SUFFIX();
637 if (!isglobal) clear_undo_stack();
638 if (move_lines(addr) < 0)
639 return ERR;
640 break;
641 case 'n':
642 if (check_addr_range(current_addr, current_addr) < 0)
643 return ERR;
644 GET_COMMAND_SUFFIX();
645 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
646 return ERR;
647 gflag = 0;
648 break;
649 case 'p':
650 if (check_addr_range(current_addr, current_addr) < 0)
651 return ERR;
652 GET_COMMAND_SUFFIX();
653 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
654 return ERR;
655 gflag = 0;
656 break;
657 case 'P':
658 if (addr_cnt > 0) {
659 seterrmsg("unexpected address");
660 return ERR;
661 }
662 GET_COMMAND_SUFFIX();
663 prompt = prompt ? NULL : optarg ? optarg : dps;
664 break;
665 case 'q':
666 case 'Q':
667 if (addr_cnt > 0) {
668 seterrmsg("unexpected address");
669 return ERR;
670 }
671 GET_COMMAND_SUFFIX();
672 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
673 break;
674 case 'r':
675 if (!isspace((unsigned char)*ibufp)) {
676 seterrmsg("unexpected command suffix");
677 return ERR;
678 } else if (addr_cnt == 0)
679 second_addr = addr_last;
680 if ((fnp = get_filename(0)) == NULL)
681 return ERR;
682 GET_COMMAND_SUFFIX();
683 if (!isglobal) clear_undo_stack();
684 if ((addr = read_file(fnp, second_addr)) < 0)
685 return ERR;
686 else if (addr)
687 modified = 1;
688 break;
689 case 's':
690 do {
691 switch (*ibufp) {
692 case '\n':
693 sflags |=SGF;
694 break;
695 case 'g':
696 sflags |= SGG;
697 ibufp++;
698 break;
699 case 'p':
700 sflags |= SGP;
701 ibufp++;
702 break;
703 case 'r':
704 sflags |= SGR;
705 ibufp++;
706 break;
707 case '0': case '1': case '2': case '3': case '4':
708 case '5': case '6': case '7': case '8': case '9':
709 STRTOI(sgnum, ibufp);
710 sflags |= SGF;
711 sgflag &= ~GSG; /* override GSG */
712 break;
713 default:
714 if (sflags) {
715 seterrmsg("invalid command suffix");
716 return ERR;
717 }
718 }
719 } while (sflags && *ibufp != '\n');
720 if (sflags && !pat) {
721 seterrmsg("no previous substitution");
722 return ERR;
723 } else if (sflags & SGG)
724 sgnum = 0; /* override numeric arg */
725 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
726 seterrmsg("invalid pattern delimiter");
727 return ERR;
728 }
729 tpat = pat;
730 SPL1();
731 if ((!sflags || (sflags & SGR)) &&
732 (tpat = get_compiled_pattern()) == NULL) {
733 SPL0();
734 return ERR;
735 } else if (tpat != pat) {
736 if (pat) {
737 regfree(pat);
738 free(pat);
739 }
740 pat = tpat;
741 patlock = 1; /* reserve pattern */
742 }
743 SPL0();
744 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
745 return ERR;
746 else if (isglobal)
747 sgflag |= GLB;
748 else
749 sgflag &= ~GLB;
750 if (sflags & SGG)
751 sgflag ^= GSG;
752 if (sflags & SGP) {
753 sgflag ^= GPR;
754 sgflag &= ~(GLS | GNP);
755 }
756 do {
757 switch (*ibufp) {
758 case 'p':
759 sgflag |= GPR;
760 ibufp++;
761 break;
762 case 'l':
763 sgflag |= GLS;
764 ibufp++;
765 break;
766 case 'n':
767 sgflag |= GNP;
768 ibufp++;
769 break;
770 default:
771 n++;
772 }
773 } while (!n);
774 if (check_addr_range(current_addr, current_addr) < 0)
775 return ERR;
776 GET_COMMAND_SUFFIX();
777 if (!isglobal) clear_undo_stack();
778 if (search_and_replace(pat, sgflag, sgnum) < 0)
779 return ERR;
780 break;
781 case 't':
782 if (check_addr_range(current_addr, current_addr) < 0)
783 return ERR;
784 GET_THIRD_ADDR(addr);
785 GET_COMMAND_SUFFIX();
786 if (!isglobal) clear_undo_stack();
787 if (copy_lines(addr) < 0)
788 return ERR;
789 break;
790 case 'u':
791 if (addr_cnt > 0) {
792 seterrmsg("unexpected address");
793 return ERR;
794 }
795 GET_COMMAND_SUFFIX();
796 if (pop_undo_stack() < 0)
797 return ERR;
798 break;
799 case 'w':
800 case 'W':
801 if ((n = *ibufp) == 'q' || n == 'Q') {
802 gflag = EOF;
803 ibufp++;
804 }
805 if (!isspace((unsigned char)*ibufp)) {
806 seterrmsg("unexpected command suffix");
807 return ERR;
808 } else if ((fnp = get_filename(0)) == NULL)
809 return ERR;
810 if (addr_cnt == 0 && !addr_last)
811 first_addr = second_addr = 0;
812 else if (check_addr_range(1, addr_last) < 0)
813 return ERR;
814 GET_COMMAND_SUFFIX();
815 if ((addr = write_file(fnp, (c == 'W') ? "a" : "w",
816 first_addr, second_addr)) < 0)
817 return ERR;
818 else if (addr == addr_last && *fnp != '!')
819 modified = 0;
820 else if (modified && !scripted && n == 'q')
821 gflag = EMOD;
822 break;
823 case 'x':
824 if (addr_cnt > 0) {
825 seterrmsg("unexpected address");
826 return ERR;
827 }
828 GET_COMMAND_SUFFIX();
829 seterrmsg("crypt unavailable");
830 return ERR;
831 case 'z':
832 first_addr = 1;
833 if (check_addr_range(first_addr, current_addr + 1) < 0)
834 return ERR;
835 else if ('0' < *ibufp && *ibufp <= '9')
836 STRTOI(rows, ibufp);
837 GET_COMMAND_SUFFIX();
838 if (display_lines(second_addr, min(addr_last,
839 second_addr + rows), gflag) < 0)
840 return ERR;
841 gflag = 0;
842 break;
843 case '=':
844 GET_COMMAND_SUFFIX();
845 printf("%d\n", addr_cnt ? second_addr : addr_last);
846 break;
847 case '!':
848 if (addr_cnt > 0) {
849 seterrmsg("unexpected address");
850 return ERR;
851 } else if ((sflags = get_shell_command()) < 0)
852 return ERR;
853 GET_COMMAND_SUFFIX();
854 if (sflags) printf("%s\n", shcmd + 1);
855 fflush(NULL); /* flush any buffered I/O */
856 system(shcmd + 1);
857 if (!scripted) printf("!\n");
858 break;
859 case '\n':
860 first_addr = 1;
861 if (check_addr_range(first_addr, current_addr + 1) < 0
862 || display_lines(second_addr, second_addr, 0) < 0)
863 return ERR;
864 break;
865 default:
866 seterrmsg("unknown command");
867 return ERR;
868 }
869 return gflag;
870 }
871
872
873 /* check_addr_range: return status of address range check */
874 static int
check_addr_range(int n,int m)875 check_addr_range(int n, int m)
876 {
877 if (addr_cnt == 0) {
878 first_addr = n;
879 second_addr = m;
880 }
881 if (first_addr > second_addr || 1 > first_addr ||
882 second_addr > addr_last) {
883 seterrmsg("invalid address");
884 return ERR;
885 }
886 return 0;
887 }
888
889
890 /* get_matching_node_addr: return the address of the next line matching a
891 pattern in a given direction. wrap around begin/end of editor buffer if
892 necessary */
893 static int
get_matching_node_addr(regex_t * pat,int dir)894 get_matching_node_addr(regex_t *pat, int dir)
895 {
896 char *s;
897 int n = current_addr;
898 line_t *lp;
899
900 if (!pat) return ERR;
901 do {
902 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
903 lp = get_addressed_line_node(n);
904 if ((s = get_sbuf_line(lp)) == NULL)
905 return ERR;
906 if (isbinary)
907 NUL_TO_NEWLINE(s, lp->len);
908 if (!regexec(pat, s, 0, NULL, 0))
909 return n;
910 }
911 } while (n != current_addr);
912 seterrmsg("no match");
913 return ERR;
914 }
915
916
917 /* get_filename: return pointer to copy of filename in the command buffer */
918 static char *
get_filename(int save)919 get_filename(int save)
920 {
921 static char filename[PATH_MAX];
922 char *p;
923 int n;
924
925 if (*ibufp != '\n') {
926 SKIP_BLANKS();
927 if (*ibufp == '\n') {
928 seterrmsg("invalid filename");
929 return NULL;
930 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
931 return NULL;
932 else if (*ibufp == '!') {
933 ibufp++;
934 if ((n = get_shell_command()) < 0)
935 return NULL;
936 if (n) printf("%s\n", shcmd + 1);
937 return shcmd;
938 } else if (n >= PATH_MAX - 1) {
939 seterrmsg("filename too long");
940 return NULL;
941 }
942 } else {
943 if (*old_filename == '\0') {
944 seterrmsg("no current filename");
945 return NULL;
946 }
947 return old_filename;
948 }
949
950 p = save ? old_filename : *old_filename ? filename : old_filename;
951 for (n = 0; *ibufp != '\n';)
952 p[n++] = *ibufp++;
953 p[n] = '\0';
954 return p;
955 }
956
957
958 /* get_shell_command: read a shell command from stdin; return substitution
959 status */
960 static int
get_shell_command(void)961 get_shell_command(void)
962 {
963 static char *buf = NULL;
964 static int n = 0;
965
966 char *s; /* substitution char pointer */
967 int i = 0;
968 int j = 0;
969
970 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 else if (shcmd == NULL)
988 {
989 seterrmsg("no previous command");
990 return ERR;
991 } else {
992 REALLOC(buf, n, i + shcmdi, ERR);
993 for (s = shcmd + 1; s < shcmd + shcmdi;)
994 buf[i++] = *s++;
995 s = ibufp++;
996 }
997 break;
998 case '%':
999 if (*old_filename == '\0') {
1000 seterrmsg("no current filename");
1001 return ERR;
1002 }
1003 j = strlen(s = strip_escapes(old_filename));
1004 REALLOC(buf, n, i + j, ERR);
1005 while (j--)
1006 buf[i++] = *s++;
1007 s = ibufp++;
1008 break;
1009 }
1010 if (i == 1) {
1011 seterrmsg("no command");
1012 return ERR;
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 */
1023 static int
append_lines(int n)1024 append_lines(int n)
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 */
1072 static int
join_lines(int from,int to)1073 join_lines(int from, int to)
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 */
1109 static int
move_lines(int addr)1110 move_lines(int addr)
1111 {
1112 line_t *b1, *a1, *b2, *a2;
1113 int n = INC_MOD(second_addr, addr_last);
1114 int 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 */
1153 static int
copy_lines(int addr)1154 copy_lines(int addr)
1155 {
1156 line_t *lp, *np = get_addressed_line_node(first_addr);
1157 undo_t *up = NULL;
1158 int n = second_addr - first_addr + 1;
1159 int 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 */
1189 int
delete_lines(int from,int to)1190 delete_lines(int from, int to)
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 */
1214 int
display_lines(int from,int to,int gflag)1215 display_lines(int from, int to, int gflag)
1216 {
1217 line_t *bp;
1218 line_t *ep;
1219 char *s;
1220
1221 if (!from) {
1222 seterrmsg("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
1239 static line_t *mark[MAXMARK]; /* line markers */
1240 static int markno; /* line marker count */
1241
1242 /* mark_line_node: set a line node mark */
1243 static int
mark_line_node(line_t * lp,int n)1244 mark_line_node(line_t *lp, int n)
1245 {
1246 if (!islower(n)) {
1247 seterrmsg("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 */
1257 static int
get_marked_node_addr(int n)1258 get_marked_node_addr(int n)
1259 {
1260 if (!islower(n)) {
1261 seterrmsg("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 */
1269 void
unmark_line_node(line_t * lp)1270 unmark_line_node(line_t *lp)
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 */
1283 static line_t *
dup_line_node(line_t * lp)1284 dup_line_node(line_t *lp)
1285 {
1286 line_t *np;
1287
1288 if ((np = malloc(sizeof(line_t))) == NULL) {
1289 perror(NULL);
1290 seterrmsg("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 */
1301 int
has_trailing_escape(char * s,char * t)1302 has_trailing_escape(char *s, char *t)
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 */
1309 char *
strip_escapes(char * s)1310 strip_escapes(char *s)
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 /* assert: no trailing escape */
1319 while ((file[i++] = (*s == '\\') ? *++s : *s) != '\0' &&
1320 i < PATH_MAX-1)
1321 s++;
1322 file[PATH_MAX-1] = '\0';
1323 return file;
1324 }
1325
1326
1327 void
signal_hup(int signo)1328 signal_hup(int signo)
1329 {
1330 int save_errno = errno;
1331
1332 if (mutex)
1333 sighup = 1;
1334 else
1335 handle_hup(signo);
1336 errno = save_errno;
1337 }
1338
1339
1340 void
signal_int(int signo)1341 signal_int(int signo)
1342 {
1343 int save_errno = errno;
1344
1345 if (mutex)
1346 sigint = 1;
1347 else
1348 handle_int(signo);
1349 errno = save_errno;
1350 }
1351
1352
1353 void
handle_hup(int signo)1354 handle_hup(int signo)
1355 {
1356 char hup[PATH_MAX];
1357
1358 if (!sigactive)
1359 quit(1); /* XXX signal race */
1360 sighup = 0;
1361 /* XXX signal race */
1362 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 &&
1363 home != NULL && home[0] == '/') {
1364 if (strlcpy(hup, home, sizeof(hup)) < sizeof(hup) &&
1365 strlcat(hup, "/ed.hup", sizeof(hup)) < sizeof(hup))
1366 write_file(hup, "w", 1, addr_last);
1367 }
1368 _exit(2);
1369 }
1370
1371
1372 void
handle_int(int signo)1373 handle_int(int signo)
1374 {
1375 if (!sigactive)
1376 _exit(1);
1377 sigint = 0;
1378 siglongjmp(env, -1);
1379 }
1380
1381
1382 void
handle_winch(int signo)1383 handle_winch(int signo)
1384 {
1385 int save_errno = errno;
1386 struct winsize ws; /* window size structure */
1387
1388 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == 0) {
1389 if (ws.ws_row > 2)
1390 rows = ws.ws_row - 2;
1391 if (ws.ws_col > 8)
1392 cols = ws.ws_col - 8;
1393 }
1394 errno = save_errno;
1395 }
1396