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
30 #if 0
31 static const char copyright[] =
32 "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\
33 All rights reserved.\n";
34 #endif
35 #endif /* not lint */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
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
69 static sigjmp_buf env;
70 #else
71 static jmp_buf env;
72 #endif
73
74 /* static buffers */
75 char stdinbuf[1]; /* stdin buffer */
76 static char *shcmd; /* shell command buffer */
77 static int shcmdsz; /* shell command buffer size */
78 static int shcmdi; /* shell command buffer index */
79 char *ibuf; /* ed command-line buffer */
80 int ibufsz; /* ed command-line buffer size */
81 char *ibufp; /* pointer to ed command-line buffer */
82
83 /* global flags */
84 int des = 0; /* if set, use crypt(3) for i/o */
85 static int garrulous = 0; /* if set, print all error messages */
86 int isbinary; /* if set, buffer contains ASCII NULs */
87 int isglobal; /* if set, doing a global command */
88 int modified; /* if set, buffer modified since last write */
89 int mutex = 0; /* if set, signals set "sigflags" */
90 static int red = 0; /* if set, restrict shell/directory access */
91 int scripted = 0; /* if set, suppress diagnostics */
92 int sigflags = 0; /* if set, signals received while mutex set */
93 static int sigactive = 0; /* if set, signal handlers are enabled */
94
95 static char old_filename[PATH_MAX] = ""; /* default filename */
96 long current_addr; /* current address in editor buffer */
97 long addr_last; /* last address in editor buffer */
98 int lineno; /* script line number */
99 static const char *prompt; /* command-line prompt */
100 static const char *dps = "*"; /* default command-line prompt */
101
102 static const char *usage = "usage: %s [-] [-sx] [-p string] [file]\n";
103
104 /* ed: line editor */
105 int
main(volatile int argc,char ** volatile argv)106 main(volatile int argc, char ** volatile argv)
107 {
108 int c, n;
109 long status = 0;
110
111 (void)setlocale(LC_ALL, "");
112
113 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
114 top:
115 while ((c = getopt(argc, argv, "p:sx")) != -1)
116 switch(c) {
117 case 'p': /* set prompt */
118 prompt = optarg;
119 break;
120 case 's': /* run script */
121 scripted = 1;
122 break;
123 case 'x': /* use crypt */
124 #ifdef DES
125 des = get_keyword();
126 #else
127 fprintf(stderr, "crypt unavailable\n?\n");
128 #endif
129 break;
130
131 default:
132 fprintf(stderr, usage, red ? "red" : "ed");
133 exit(1);
134 }
135 argv += optind;
136 argc -= optind;
137 if (argc && **argv == '-') {
138 scripted = 1;
139 if (argc > 1) {
140 optind = 1;
141 goto top;
142 }
143 argv++;
144 argc--;
145 }
146 /* assert: reliable signals! */
147 #ifdef SIGWINCH
148 handle_winch(SIGWINCH);
149 if (isatty(0)) signal(SIGWINCH, handle_winch);
150 #endif
151 signal(SIGHUP, signal_hup);
152 signal(SIGQUIT, SIG_IGN);
153 signal(SIGINT, signal_int);
154 #ifdef _POSIX_SOURCE
155 if ((status = sigsetjmp(env, 1)))
156 #else
157 if ((status = setjmp(env)))
158 #endif
159 {
160 fputs("\n?\n", stderr);
161 errmsg = "interrupt";
162 } else {
163 init_buffers();
164 sigactive = 1; /* enable signal handlers */
165 if (argc && **argv && is_legal_filename(*argv)) {
166 if (read_file(*argv, 0) < 0 && !isatty(0))
167 quit(2);
168 else if (**argv != '!')
169 if (strlcpy(old_filename, *argv, sizeof(old_filename))
170 >= sizeof(old_filename))
171 quit(2);
172 } else if (argc) {
173 fputs("?\n", stderr);
174 if (**argv == '\0')
175 errmsg = "invalid filename";
176 if (!isatty(0))
177 quit(2);
178 }
179 }
180 for (;;) {
181 if (status < 0 && garrulous)
182 fprintf(stderr, "%s\n", errmsg);
183 if (prompt) {
184 printf("%s", prompt);
185 fflush(stdout);
186 }
187 if ((n = get_tty_line()) < 0) {
188 status = ERR;
189 continue;
190 } else if (n == 0) {
191 if (modified && !scripted) {
192 fputs("?\n", stderr);
193 errmsg = "warning: file modified";
194 if (!isatty(0)) {
195 if (garrulous)
196 fprintf(stderr,
197 "script, line %d: %s\n",
198 lineno, errmsg);
199 quit(2);
200 }
201 clearerr(stdin);
202 modified = 0;
203 status = EMOD;
204 continue;
205 } else
206 quit(0);
207 } else if (ibuf[n - 1] != '\n') {
208 /* discard line */
209 errmsg = "unexpected end-of-file";
210 clearerr(stdin);
211 status = ERR;
212 continue;
213 }
214 isglobal = 0;
215 if ((status = extract_addr_range()) >= 0 &&
216 (status = exec_command()) >= 0)
217 if (!status ||
218 (status = display_lines(current_addr, current_addr,
219 status)) >= 0)
220 continue;
221 switch (status) {
222 case EOF:
223 quit(0);
224 case EMOD:
225 modified = 0;
226 fputs("?\n", stderr); /* give warning */
227 errmsg = "warning: file modified";
228 if (!isatty(0)) {
229 if (garrulous)
230 fprintf(stderr, "script, line %d: %s\n",
231 lineno, errmsg);
232 quit(2);
233 }
234 break;
235 case FATAL:
236 if (!isatty(0)) {
237 if (garrulous)
238 fprintf(stderr, "script, line %d: %s\n",
239 lineno, errmsg);
240 } else if (garrulous)
241 fprintf(stderr, "%s\n", errmsg);
242 quit(3);
243 default:
244 fputs("?\n", stderr);
245 if (!isatty(0)) {
246 if (garrulous)
247 fprintf(stderr, "script, line %d: %s\n",
248 lineno, errmsg);
249 quit(2);
250 }
251 break;
252 }
253 }
254 /*NOTREACHED*/
255 }
256
257 long first_addr, second_addr;
258 static long addr_cnt;
259
260 /* extract_addr_range: get line addresses from the command buffer until an
261 illegal address is seen; return status */
262 int
extract_addr_range(void)263 extract_addr_range(void)
264 {
265 long addr;
266
267 addr_cnt = 0;
268 first_addr = second_addr = current_addr;
269 while ((addr = next_addr()) >= 0) {
270 addr_cnt++;
271 first_addr = second_addr;
272 second_addr = addr;
273 if (*ibufp != ',' && *ibufp != ';')
274 break;
275 else if (*ibufp++ == ';')
276 current_addr = addr;
277 }
278 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
279 first_addr = second_addr;
280 return (addr == ERR) ? ERR : 0;
281 }
282
283
284 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
285
286 #define MUST_BE_FIRST() do { \
287 if (!first) { \
288 errmsg = "invalid address"; \
289 return ERR; \
290 } \
291 } while (0)
292
293 /* next_addr: return the next line address in the command buffer */
294 long
next_addr(void)295 next_addr(void)
296 {
297 const char *hd;
298 long addr = current_addr;
299 long n;
300 int first = 1;
301 int c;
302
303 SKIP_BLANKS();
304 for (hd = ibufp;; first = 0)
305 switch (c = *ibufp) {
306 case '+':
307 case '\t':
308 case ' ':
309 case '-':
310 case '^':
311 ibufp++;
312 SKIP_BLANKS();
313 if (isdigit((unsigned char)*ibufp)) {
314 STRTOL(n, ibufp);
315 addr += (c == '-' || c == '^') ? -n : n;
316 } else if (!isspace((unsigned char)c))
317 addr += (c == '-' || c == '^') ? -1 : 1;
318 break;
319 case '0': case '1': case '2':
320 case '3': case '4': case '5':
321 case '6': case '7': case '8': case '9':
322 MUST_BE_FIRST();
323 STRTOL(addr, ibufp);
324 break;
325 case '.':
326 case '$':
327 MUST_BE_FIRST();
328 ibufp++;
329 addr = (c == '.') ? current_addr : addr_last;
330 break;
331 case '/':
332 case '?':
333 MUST_BE_FIRST();
334 if ((addr = get_matching_node_addr(
335 get_compiled_pattern(), c == '/')) < 0)
336 return ERR;
337 else if (c == *ibufp)
338 ibufp++;
339 break;
340 case '\'':
341 MUST_BE_FIRST();
342 ibufp++;
343 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
344 return ERR;
345 break;
346 case '%':
347 case ',':
348 case ';':
349 if (first) {
350 ibufp++;
351 addr_cnt++;
352 second_addr = (c == ';') ? current_addr : 1;
353 addr = addr_last;
354 break;
355 }
356 /* FALLTHROUGH */
357 default:
358 if (ibufp == hd)
359 return EOF;
360 else if (addr < 0 || addr_last < addr) {
361 errmsg = "invalid address";
362 return ERR;
363 } else
364 return addr;
365 }
366 /* NOTREACHED */
367 }
368
369
370 #ifdef BACKWARDS
371 /* GET_THIRD_ADDR: get a legal address from the command buffer */
372 #define GET_THIRD_ADDR(addr) \
373 { \
374 long ol1, ol2; \
375 \
376 ol1 = first_addr, ol2 = second_addr; \
377 if (extract_addr_range() < 0) \
378 return ERR; \
379 else if (addr_cnt == 0) { \
380 errmsg = "destination expected"; \
381 return ERR; \
382 } else if (second_addr < 0 || addr_last < second_addr) { \
383 errmsg = "invalid address"; \
384 return ERR; \
385 } \
386 addr = second_addr; \
387 first_addr = ol1, second_addr = ol2; \
388 }
389 #else /* BACKWARDS */
390 /* GET_THIRD_ADDR: get a legal address from the command buffer */
391 #define GET_THIRD_ADDR(addr) \
392 { \
393 long ol1, ol2; \
394 \
395 ol1 = first_addr, ol2 = second_addr; \
396 if (extract_addr_range() < 0) \
397 return ERR; \
398 if (second_addr < 0 || addr_last < second_addr) { \
399 errmsg = "invalid address"; \
400 return ERR; \
401 } \
402 addr = second_addr; \
403 first_addr = ol1, second_addr = ol2; \
404 }
405 #endif
406
407
408 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
409 #define GET_COMMAND_SUFFIX() { \
410 int done = 0; \
411 do { \
412 switch(*ibufp) { \
413 case 'p': \
414 gflag |= GPR, ibufp++; \
415 break; \
416 case 'l': \
417 gflag |= GLS, ibufp++; \
418 break; \
419 case 'n': \
420 gflag |= GNP, ibufp++; \
421 break; \
422 default: \
423 done++; \
424 } \
425 } while (!done); \
426 if (*ibufp++ != '\n') { \
427 errmsg = "invalid command suffix"; \
428 return ERR; \
429 } \
430 }
431
432
433 /* sflags */
434 #define SGG 001 /* complement previous global substitute suffix */
435 #define SGP 002 /* complement previous print suffix */
436 #define SGR 004 /* use last regex instead of last pat */
437 #define SGF 010 /* repeat last substitution */
438
439 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
440
441 long rows = 22; /* scroll length: ws_row - 2 */
442
443 /* exec_command: execute the next command in command buffer; return print
444 request, if any */
445 int
exec_command(void)446 exec_command(void)
447 {
448 static pattern_t *pat = NULL;
449 static int sgflag = 0;
450 static long sgnum = 0;
451
452 pattern_t *tpat;
453 char *fnp;
454 int gflag = 0;
455 int sflags = 0;
456 long addr = 0;
457 int n = 0;
458 int c;
459
460 SKIP_BLANKS();
461 switch(c = *ibufp++) {
462 case 'a':
463 GET_COMMAND_SUFFIX();
464 if (!isglobal) clear_undo_stack();
465 if (append_lines(second_addr) < 0)
466 return ERR;
467 break;
468 case 'c':
469 if (check_addr_range(current_addr, current_addr) < 0)
470 return ERR;
471 GET_COMMAND_SUFFIX();
472 if (!isglobal) clear_undo_stack();
473 if (delete_lines(first_addr, second_addr) < 0 ||
474 append_lines(current_addr) < 0)
475 return ERR;
476 break;
477 case 'd':
478 if (check_addr_range(current_addr, current_addr) < 0)
479 return ERR;
480 GET_COMMAND_SUFFIX();
481 if (!isglobal) clear_undo_stack();
482 if (delete_lines(first_addr, second_addr) < 0)
483 return ERR;
484 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
485 current_addr = addr;
486 break;
487 case 'e':
488 if (modified && !scripted)
489 return EMOD;
490 /* FALLTHROUGH */
491 case 'E':
492 if (addr_cnt > 0) {
493 errmsg = "unexpected address";
494 return ERR;
495 } else if (!isspace((unsigned char)*ibufp)) {
496 errmsg = "unexpected command suffix";
497 return ERR;
498 } else if ((fnp = get_filename()) == NULL)
499 return ERR;
500 GET_COMMAND_SUFFIX();
501 if (delete_lines(1, addr_last) < 0)
502 return ERR;
503 clear_undo_stack();
504 if (close_sbuf() < 0)
505 return ERR;
506 else if (open_sbuf() < 0)
507 return FATAL;
508 if (*fnp && *fnp != '!')
509 strlcpy(old_filename, fnp, PATH_MAX);
510 #ifdef BACKWARDS
511 if (*fnp == '\0' && *old_filename == '\0') {
512 errmsg = "no current filename";
513 return ERR;
514 }
515 #endif
516 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
517 return ERR;
518 clear_undo_stack();
519 modified = 0;
520 u_current_addr = u_addr_last = -1;
521 break;
522 case 'f':
523 if (addr_cnt > 0) {
524 errmsg = "unexpected address";
525 return ERR;
526 } else if (!isspace((unsigned char)*ibufp)) {
527 errmsg = "unexpected command suffix";
528 return ERR;
529 } else if ((fnp = get_filename()) == NULL)
530 return ERR;
531 else if (*fnp == '!') {
532 errmsg = "invalid redirection";
533 return ERR;
534 }
535 GET_COMMAND_SUFFIX();
536 if (*fnp)
537 strlcpy(old_filename, fnp, PATH_MAX);
538 printf("%s\n", strip_escapes(old_filename));
539 break;
540 case 'g':
541 case 'v':
542 case 'G':
543 case 'V':
544 if (isglobal) {
545 errmsg = "cannot nest global commands";
546 return ERR;
547 } else if (check_addr_range(1, addr_last) < 0)
548 return ERR;
549 else if (build_active_list(c == 'g' || c == 'G') < 0)
550 return ERR;
551 else if ((n = (c == 'G' || c == 'V')))
552 GET_COMMAND_SUFFIX();
553 isglobal++;
554 if (exec_global(n, gflag) < 0)
555 return ERR;
556 break;
557 case 'h':
558 if (addr_cnt > 0) {
559 errmsg = "unexpected address";
560 return ERR;
561 }
562 GET_COMMAND_SUFFIX();
563 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
564 break;
565 case 'H':
566 if (addr_cnt > 0) {
567 errmsg = "unexpected address";
568 return ERR;
569 }
570 GET_COMMAND_SUFFIX();
571 if ((garrulous = 1 - garrulous) && *errmsg)
572 fprintf(stderr, "%s\n", errmsg);
573 break;
574 case 'i':
575 if (second_addr == 0) {
576 errmsg = "invalid address";
577 return ERR;
578 }
579 GET_COMMAND_SUFFIX();
580 if (!isglobal) clear_undo_stack();
581 if (append_lines(second_addr - 1) < 0)
582 return ERR;
583 break;
584 case 'j':
585 if (check_addr_range(current_addr, current_addr + 1) < 0)
586 return ERR;
587 GET_COMMAND_SUFFIX();
588 if (!isglobal) clear_undo_stack();
589 if (first_addr != second_addr &&
590 join_lines(first_addr, second_addr) < 0)
591 return ERR;
592 break;
593 case 'k':
594 c = *ibufp++;
595 if (second_addr == 0) {
596 errmsg = "invalid address";
597 return ERR;
598 }
599 GET_COMMAND_SUFFIX();
600 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
601 return ERR;
602 break;
603 case 'l':
604 if (check_addr_range(current_addr, current_addr) < 0)
605 return ERR;
606 GET_COMMAND_SUFFIX();
607 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
608 return ERR;
609 gflag = 0;
610 break;
611 case 'm':
612 if (check_addr_range(current_addr, current_addr) < 0)
613 return ERR;
614 GET_THIRD_ADDR(addr);
615 if (first_addr <= addr && addr < second_addr) {
616 errmsg = "invalid destination";
617 return ERR;
618 }
619 GET_COMMAND_SUFFIX();
620 if (!isglobal) clear_undo_stack();
621 if (move_lines(addr) < 0)
622 return ERR;
623 break;
624 case 'n':
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 | GNP) < 0)
629 return ERR;
630 gflag = 0;
631 break;
632 case 'p':
633 if (check_addr_range(current_addr, current_addr) < 0)
634 return ERR;
635 GET_COMMAND_SUFFIX();
636 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
637 return ERR;
638 gflag = 0;
639 break;
640 case 'P':
641 if (addr_cnt > 0) {
642 errmsg = "unexpected address";
643 return ERR;
644 }
645 GET_COMMAND_SUFFIX();
646 prompt = prompt ? NULL : optarg ? optarg : dps;
647 break;
648 case 'q':
649 case 'Q':
650 if (addr_cnt > 0) {
651 errmsg = "unexpected address";
652 return ERR;
653 }
654 GET_COMMAND_SUFFIX();
655 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
656 break;
657 case 'r':
658 if (!isspace((unsigned char)*ibufp)) {
659 errmsg = "unexpected command suffix";
660 return ERR;
661 } else if (addr_cnt == 0)
662 second_addr = addr_last;
663 if ((fnp = get_filename()) == NULL)
664 return ERR;
665 GET_COMMAND_SUFFIX();
666 if (!isglobal) clear_undo_stack();
667 if (*old_filename == '\0' && *fnp != '!')
668 strlcpy(old_filename, fnp, PATH_MAX);
669 #ifdef BACKWARDS
670 if (*fnp == '\0' && *old_filename == '\0') {
671 errmsg = "no current filename";
672 return ERR;
673 }
674 #endif
675 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
676 return ERR;
677 else if (addr && addr != addr_last)
678 modified = 1;
679 break;
680 case 's':
681 do {
682 switch(*ibufp) {
683 case '\n':
684 sflags |=SGF;
685 break;
686 case 'g':
687 sflags |= SGG;
688 ibufp++;
689 break;
690 case 'p':
691 sflags |= SGP;
692 ibufp++;
693 break;
694 case 'r':
695 sflags |= SGR;
696 ibufp++;
697 break;
698 case '0': case '1': case '2': case '3': case '4':
699 case '5': case '6': case '7': case '8': case '9':
700 STRTOL(sgnum, ibufp);
701 sflags |= SGF;
702 sgflag &= ~GSG; /* override GSG */
703 break;
704 default:
705 if (sflags) {
706 errmsg = "invalid command suffix";
707 return ERR;
708 }
709 }
710 } while (sflags && *ibufp != '\n');
711 if (sflags && !pat) {
712 errmsg = "no previous substitution";
713 return ERR;
714 } else if (sflags & SGG)
715 sgnum = 0; /* override numeric arg */
716 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
717 errmsg = "invalid pattern delimiter";
718 return ERR;
719 }
720 tpat = pat;
721 SPL1();
722 if ((!sflags || (sflags & SGR)) &&
723 (tpat = get_compiled_pattern()) == NULL) {
724 SPL0();
725 return ERR;
726 } else if (tpat != pat) {
727 if (pat) {
728 regfree(pat);
729 free(pat);
730 }
731 pat = tpat;
732 patlock = 1; /* reserve pattern */
733 }
734 SPL0();
735 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
736 return ERR;
737 else if (isglobal)
738 sgflag |= GLB;
739 else
740 sgflag &= ~GLB;
741 if (sflags & SGG)
742 sgflag ^= GSG;
743 if (sflags & SGP)
744 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
745 do {
746 switch(*ibufp) {
747 case 'p':
748 sgflag |= GPR, ibufp++;
749 break;
750 case 'l':
751 sgflag |= GLS, ibufp++;
752 break;
753 case 'n':
754 sgflag |= GNP, ibufp++;
755 break;
756 default:
757 n++;
758 }
759 } while (!n);
760 if (check_addr_range(current_addr, current_addr) < 0)
761 return ERR;
762 GET_COMMAND_SUFFIX();
763 if (!isglobal) clear_undo_stack();
764 if (search_and_replace(pat, sgflag, sgnum) < 0)
765 return ERR;
766 break;
767 case 't':
768 if (check_addr_range(current_addr, current_addr) < 0)
769 return ERR;
770 GET_THIRD_ADDR(addr);
771 GET_COMMAND_SUFFIX();
772 if (!isglobal) clear_undo_stack();
773 if (copy_lines(addr) < 0)
774 return ERR;
775 break;
776 case 'u':
777 if (addr_cnt > 0) {
778 errmsg = "unexpected address";
779 return ERR;
780 }
781 GET_COMMAND_SUFFIX();
782 if (pop_undo_stack() < 0)
783 return ERR;
784 break;
785 case 'w':
786 case 'W':
787 if ((n = *ibufp) == 'q' || n == 'Q') {
788 gflag = EOF;
789 ibufp++;
790 }
791 if (!isspace((unsigned char)*ibufp)) {
792 errmsg = "unexpected command suffix";
793 return ERR;
794 } else if ((fnp = get_filename()) == NULL)
795 return ERR;
796 if (addr_cnt == 0 && !addr_last)
797 first_addr = second_addr = 0;
798 else if (check_addr_range(1, addr_last) < 0)
799 return ERR;
800 GET_COMMAND_SUFFIX();
801 if (*old_filename == '\0' && *fnp != '!')
802 strlcpy(old_filename, fnp, PATH_MAX);
803 #ifdef BACKWARDS
804 if (*fnp == '\0' && *old_filename == '\0') {
805 errmsg = "no current filename";
806 return ERR;
807 }
808 #endif
809 if ((addr = write_file(*fnp ? fnp : old_filename,
810 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
811 return ERR;
812 else if (addr == addr_last)
813 modified = 0;
814 else if (modified && !scripted && n == 'q')
815 gflag = EMOD;
816 break;
817 case 'x':
818 if (addr_cnt > 0) {
819 errmsg = "unexpected address";
820 return ERR;
821 }
822 GET_COMMAND_SUFFIX();
823 #ifdef DES
824 des = get_keyword();
825 break;
826 #else
827 errmsg = "crypt unavailable";
828 return ERR;
829 #endif
830 case 'z':
831 #ifdef BACKWARDS
832 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
833 #else
834 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
835 #endif
836 return ERR;
837 else if ('0' < *ibufp && *ibufp <= '9')
838 STRTOL(rows, ibufp);
839 GET_COMMAND_SUFFIX();
840 if (display_lines(second_addr, min(addr_last,
841 second_addr + rows), gflag) < 0)
842 return ERR;
843 gflag = 0;
844 break;
845 case '=':
846 GET_COMMAND_SUFFIX();
847 printf("%ld\n", addr_cnt ? second_addr : addr_last);
848 break;
849 case '!':
850 if (addr_cnt > 0) {
851 errmsg = "unexpected address";
852 return ERR;
853 } else if ((sflags = get_shell_command()) < 0)
854 return ERR;
855 GET_COMMAND_SUFFIX();
856 if (sflags) printf("%s\n", shcmd + 1);
857 system(shcmd + 1);
858 if (!scripted) printf("!\n");
859 break;
860 case '\n':
861 #ifdef BACKWARDS
862 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
863 #else
864 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
865 #endif
866 || display_lines(second_addr, second_addr, 0) < 0)
867 return ERR;
868 break;
869 default:
870 errmsg = "unknown command";
871 return ERR;
872 }
873 return gflag;
874 }
875
876
877 /* check_addr_range: return status of address range check */
878 int
check_addr_range(long n,long m)879 check_addr_range(long n, long m)
880 {
881 if (addr_cnt == 0) {
882 first_addr = n;
883 second_addr = m;
884 }
885 if (first_addr > second_addr || 1 > first_addr ||
886 second_addr > addr_last) {
887 errmsg = "invalid address";
888 return ERR;
889 }
890 return 0;
891 }
892
893
894 /* get_matching_node_addr: return the address of the next line matching a
895 pattern in a given direction. wrap around begin/end of editor buffer if
896 necessary */
897 long
get_matching_node_addr(pattern_t * pat,int dir)898 get_matching_node_addr(pattern_t *pat, int dir)
899 {
900 char *s;
901 long n = current_addr;
902 line_t *lp;
903
904 if (!pat) return ERR;
905 do {
906 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
907 lp = get_addressed_line_node(n);
908 if ((s = get_sbuf_line(lp)) == NULL)
909 return ERR;
910 if (isbinary)
911 NUL_TO_NEWLINE(s, lp->len);
912 if (!regexec(pat, s, 0, NULL, 0))
913 return n;
914 }
915 } while (n != current_addr);
916 errmsg = "no match";
917 return ERR;
918 }
919
920
921 /* get_filename: return pointer to copy of filename in the command buffer */
922 char *
get_filename(void)923 get_filename(void)
924 {
925 static char *file = NULL;
926 static int filesz = 0;
927
928 int n;
929
930 if (*ibufp != '\n') {
931 SKIP_BLANKS();
932 if (*ibufp == '\n') {
933 errmsg = "invalid filename";
934 return NULL;
935 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
936 return NULL;
937 else if (*ibufp == '!') {
938 ibufp++;
939 if ((n = get_shell_command()) < 0)
940 return NULL;
941 if (n)
942 printf("%s\n", shcmd + 1);
943 return shcmd;
944 } else if (n > PATH_MAX - 1) {
945 errmsg = "filename too long";
946 return NULL;
947 }
948 }
949 #ifndef BACKWARDS
950 else if (*old_filename == '\0') {
951 errmsg = "no current filename";
952 return NULL;
953 }
954 #endif
955 REALLOC(file, filesz, PATH_MAX, NULL);
956 for (n = 0; *ibufp != '\n';)
957 file[n++] = *ibufp++;
958 file[n] = '\0';
959 return is_legal_filename(file) ? file : NULL;
960 }
961
962
963 /* get_shell_command: read a shell command from stdin; return substitution
964 status */
965 int
get_shell_command(void)966 get_shell_command(void)
967 {
968 static char *buf = NULL;
969 static int n = 0;
970
971 char *s; /* substitution char pointer */
972 int i = 0;
973 int j = 0;
974
975 if (red) {
976 errmsg = "shell access restricted";
977 return ERR;
978 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
979 return ERR;
980 REALLOC(buf, n, j + 1, ERR);
981 buf[i++] = '!'; /* prefix command w/ bang */
982 while (*ibufp != '\n')
983 switch (*ibufp) {
984 default:
985 REALLOC(buf, n, i + 2, ERR);
986 buf[i++] = *ibufp;
987 if (*ibufp++ == '\\')
988 buf[i++] = *ibufp++;
989 break;
990 case '!':
991 if (s != ibufp) {
992 REALLOC(buf, n, i + 1, ERR);
993 buf[i++] = *ibufp++;
994 }
995 #ifdef BACKWARDS
996 else if (shcmd == NULL || *(shcmd + 1) == '\0')
997 #else
998 else if (shcmd == NULL)
999 #endif
1000 {
1001 errmsg = "no previous command";
1002 return ERR;
1003 } else {
1004 REALLOC(buf, n, i + shcmdi, ERR);
1005 for (s = shcmd + 1; s < shcmd + shcmdi;)
1006 buf[i++] = *s++;
1007 s = ibufp++;
1008 }
1009 break;
1010 case '%':
1011 if (*old_filename == '\0') {
1012 errmsg = "no current filename";
1013 return ERR;
1014 }
1015 j = strlen(s = strip_escapes(old_filename));
1016 REALLOC(buf, n, i + j, ERR);
1017 while (j--)
1018 buf[i++] = *s++;
1019 s = ibufp++;
1020 break;
1021 }
1022 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1023 memcpy(shcmd, buf, i);
1024 shcmd[shcmdi = i] = '\0';
1025 return *s == '!' || *s == '%';
1026 }
1027
1028
1029 /* append_lines: insert text from stdin to after line n; stop when either a
1030 single period is read or EOF; return status */
1031 int
append_lines(long n)1032 append_lines(long n)
1033 {
1034 int l;
1035 const char *lp = ibuf;
1036 const char *eot;
1037 undo_t *up = NULL;
1038
1039 for (current_addr = n;;) {
1040 if (!isglobal) {
1041 if ((l = get_tty_line()) < 0)
1042 return ERR;
1043 else if (l == 0 || ibuf[l - 1] != '\n') {
1044 clearerr(stdin);
1045 return l ? EOF : 0;
1046 }
1047 lp = ibuf;
1048 } else if (*(lp = ibufp) == '\0')
1049 return 0;
1050 else {
1051 while (*ibufp++ != '\n')
1052 ;
1053 l = ibufp - lp;
1054 }
1055 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1056 return 0;
1057 }
1058 eot = lp + l;
1059 SPL1();
1060 do {
1061 if ((lp = put_sbuf_line(lp)) == NULL) {
1062 SPL0();
1063 return ERR;
1064 } else if (up)
1065 up->t = get_addressed_line_node(current_addr);
1066 else if ((up = push_undo_stack(UADD, current_addr,
1067 current_addr)) == NULL) {
1068 SPL0();
1069 return ERR;
1070 }
1071 } while (lp != eot);
1072 modified = 1;
1073 SPL0();
1074 }
1075 /* NOTREACHED */
1076 }
1077
1078
1079 /* join_lines: replace a range of lines with the joined text of those lines */
1080 int
join_lines(long from,long to)1081 join_lines(long from, long to)
1082 {
1083 static char *buf = NULL;
1084 static int n;
1085
1086 char *s;
1087 int size = 0;
1088 line_t *bp, *ep;
1089
1090 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1091 bp = get_addressed_line_node(from);
1092 for (; bp != ep; bp = bp->q_forw) {
1093 if ((s = get_sbuf_line(bp)) == NULL)
1094 return ERR;
1095 REALLOC(buf, n, size + bp->len, ERR);
1096 memcpy(buf + size, s, bp->len);
1097 size += bp->len;
1098 }
1099 REALLOC(buf, n, size + 2, ERR);
1100 memcpy(buf + size, "\n", 2);
1101 if (delete_lines(from, to) < 0)
1102 return ERR;
1103 current_addr = from - 1;
1104 SPL1();
1105 if (put_sbuf_line(buf) == NULL ||
1106 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1107 SPL0();
1108 return ERR;
1109 }
1110 modified = 1;
1111 SPL0();
1112 return 0;
1113 }
1114
1115
1116 /* move_lines: move a range of lines */
1117 int
move_lines(long addr)1118 move_lines(long addr)
1119 {
1120 line_t *b1, *a1, *b2, *a2;
1121 long n = INC_MOD(second_addr, addr_last);
1122 long p = first_addr - 1;
1123 int done = (addr == first_addr - 1 || addr == second_addr);
1124
1125 SPL1();
1126 if (done) {
1127 a2 = get_addressed_line_node(n);
1128 b2 = get_addressed_line_node(p);
1129 current_addr = second_addr;
1130 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1131 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1132 SPL0();
1133 return ERR;
1134 } else {
1135 a1 = get_addressed_line_node(n);
1136 if (addr < first_addr) {
1137 b1 = get_addressed_line_node(p);
1138 b2 = get_addressed_line_node(addr);
1139 /* this get_addressed_line_node last! */
1140 } else {
1141 b2 = get_addressed_line_node(addr);
1142 b1 = get_addressed_line_node(p);
1143 /* this get_addressed_line_node last! */
1144 }
1145 a2 = b2->q_forw;
1146 REQUE(b2, b1->q_forw);
1147 REQUE(a1->q_back, a2);
1148 REQUE(b1, a1);
1149 current_addr = addr + ((addr < first_addr) ?
1150 second_addr - first_addr + 1 : 0);
1151 }
1152 if (isglobal)
1153 unset_active_nodes(b2->q_forw, a2);
1154 modified = 1;
1155 SPL0();
1156 return 0;
1157 }
1158
1159
1160 /* copy_lines: copy a range of lines; return status */
1161 int
copy_lines(long addr)1162 copy_lines(long addr)
1163 {
1164 line_t *lp, *np = get_addressed_line_node(first_addr);
1165 undo_t *up = NULL;
1166 long n = second_addr - first_addr + 1;
1167 long m = 0;
1168
1169 current_addr = addr;
1170 if (first_addr <= addr && addr < second_addr) {
1171 n = addr - first_addr + 1;
1172 m = second_addr - addr;
1173 }
1174 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1175 for (; n-- > 0; np = np->q_forw) {
1176 SPL1();
1177 if ((lp = dup_line_node(np)) == NULL) {
1178 SPL0();
1179 return ERR;
1180 }
1181 add_line_node(lp);
1182 if (up)
1183 up->t = lp;
1184 else if ((up = push_undo_stack(UADD, current_addr,
1185 current_addr)) == NULL) {
1186 SPL0();
1187 return ERR;
1188 }
1189 modified = 1;
1190 SPL0();
1191 }
1192 return 0;
1193 }
1194
1195
1196 /* delete_lines: delete a range of lines */
1197 int
delete_lines(long from,long to)1198 delete_lines(long from, long to)
1199 {
1200 line_t *n, *p;
1201
1202 SPL1();
1203 if (push_undo_stack(UDEL, from, to) == NULL) {
1204 SPL0();
1205 return ERR;
1206 }
1207 n = get_addressed_line_node(INC_MOD(to, addr_last));
1208 p = get_addressed_line_node(from - 1);
1209 /* this get_addressed_line_node last! */
1210 if (isglobal)
1211 unset_active_nodes(p->q_forw, n);
1212 REQUE(p, n);
1213 addr_last -= to - from + 1;
1214 current_addr = from - 1;
1215 modified = 1;
1216 SPL0();
1217 return 0;
1218 }
1219
1220
1221 /* display_lines: print a range of lines to stdout */
1222 int
display_lines(long from,long to,int gflag)1223 display_lines(long from, long to, int gflag)
1224 {
1225 line_t *bp;
1226 line_t *ep;
1227 char *s;
1228
1229 if (!from) {
1230 errmsg = "invalid address";
1231 return ERR;
1232 }
1233 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1234 bp = get_addressed_line_node(from);
1235 for (; bp != ep; bp = bp->q_forw) {
1236 if ((s = get_sbuf_line(bp)) == NULL)
1237 return ERR;
1238 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1239 return ERR;
1240 }
1241 return 0;
1242 }
1243
1244
1245 #define MAXMARK 26 /* max number of marks */
1246
1247 static line_t *mark[MAXMARK]; /* line markers */
1248 static int markno; /* line marker count */
1249
1250 /* mark_line_node: set a line node mark */
1251 int
mark_line_node(line_t * lp,int n)1252 mark_line_node(line_t *lp, int n)
1253 {
1254 if (!islower((unsigned char)n)) {
1255 errmsg = "invalid mark character";
1256 return ERR;
1257 } else if (mark[n - 'a'] == NULL)
1258 markno++;
1259 mark[n - 'a'] = lp;
1260 return 0;
1261 }
1262
1263
1264 /* get_marked_node_addr: return address of a marked line */
1265 long
get_marked_node_addr(int n)1266 get_marked_node_addr(int n)
1267 {
1268 if (!islower((unsigned char)n)) {
1269 errmsg = "invalid mark character";
1270 return ERR;
1271 }
1272 return get_line_node_addr(mark[n - 'a']);
1273 }
1274
1275
1276 /* unmark_line_node: clear line node mark */
1277 void
unmark_line_node(line_t * lp)1278 unmark_line_node(line_t *lp)
1279 {
1280 int i;
1281
1282 for (i = 0; markno && i < MAXMARK; i++)
1283 if (mark[i] == lp) {
1284 mark[i] = NULL;
1285 markno--;
1286 }
1287 }
1288
1289
1290 /* dup_line_node: return a pointer to a copy of a line node */
1291 line_t *
dup_line_node(line_t * lp)1292 dup_line_node(line_t *lp)
1293 {
1294 line_t *np;
1295
1296 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1297 fprintf(stderr, "%s\n", strerror(errno));
1298 errmsg = "out of memory";
1299 return NULL;
1300 }
1301 np->seek = lp->seek;
1302 np->len = lp->len;
1303 return np;
1304 }
1305
1306
1307 /* has_trailing_escape: return the parity of escapes preceding a character
1308 in a string */
1309 int
has_trailing_escape(char * s,char * t)1310 has_trailing_escape(char *s, char *t)
1311 {
1312 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1313 }
1314
1315
1316 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1317 char *
strip_escapes(char * s)1318 strip_escapes(char *s)
1319 {
1320 static char *file = NULL;
1321 static int filesz = 0;
1322
1323 int i = 0;
1324
1325 REALLOC(file, filesz, PATH_MAX, NULL);
1326 while (i < filesz - 1 /* Worry about a possible trailing escape */
1327 && (file[i++] = (*s == '\\') ? *++s : *s))
1328 s++;
1329 return file;
1330 }
1331
1332
1333 void
signal_hup(int signo)1334 signal_hup(int signo)
1335 {
1336 if (mutex)
1337 sigflags |= (1 << (signo - 1));
1338 else
1339 handle_hup(signo);
1340 }
1341
1342
1343 void
signal_int(int signo)1344 signal_int(int signo)
1345 {
1346 if (mutex)
1347 sigflags |= (1 << (signo - 1));
1348 else
1349 handle_int(signo);
1350 }
1351
1352
1353 void
handle_hup(int signo)1354 handle_hup(int signo)
1355 {
1356 char *hup = NULL; /* hup filename */
1357 char *s;
1358 char ed_hup[] = "ed.hup";
1359 int n;
1360
1361 if (!sigactive)
1362 quit(1);
1363 sigflags &= ~(1 << (signo - 1));
1364 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
1365 (s = getenv("HOME")) != NULL &&
1366 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1367 (hup = (char *) malloc(n + 10)) != NULL) {
1368 strcpy(hup, s);
1369 if (hup[n - 1] != '/')
1370 hup[n] = '/', hup[n+1] = '\0';
1371 strcat(hup, "ed.hup");
1372 write_file(hup, "w", 1, addr_last);
1373 }
1374 quit(2);
1375 }
1376
1377
1378 void
handle_int(int signo)1379 handle_int(int signo)
1380 {
1381 if (!sigactive)
1382 quit(1);
1383 sigflags &= ~(1 << (signo - 1));
1384 #ifdef _POSIX_SOURCE
1385 siglongjmp(env, -1);
1386 #else
1387 longjmp(env, -1);
1388 #endif
1389 }
1390
1391
1392 int cols = 72; /* wrap column */
1393
1394 void
handle_winch(int signo)1395 handle_winch(int signo)
1396 {
1397 int save_errno = errno;
1398
1399 struct winsize ws; /* window size structure */
1400
1401 sigflags &= ~(1 << (signo - 1));
1402 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1403 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1404 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1405 }
1406 errno = save_errno;
1407 }
1408
1409
1410 /* is_legal_filename: return a legal filename */
1411 int
is_legal_filename(char * s)1412 is_legal_filename(char *s)
1413 {
1414 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1415 errmsg = "shell access restricted";
1416 return 0;
1417 }
1418 return 1;
1419 }
1420