41#endif
42#endif /* not lint */
43
44/*
45 * CREDITS
46 *
47 * This program is based on the editor algorithm described in
48 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
49 * in Pascal," Addison-Wesley, 1981.
50 *
51 * The buffering algorithm is attributed to Rodney Ruddock of
52 * the University of Guelph, Guelph, Ontario.
53 *
54 * The cbc.c encryption code is adapted from
55 * the bdes program by Matt Bishop of Dartmouth College,
56 * Hanover, NH.
57 *
58 */
59
60#include <sys/ioctl.h>
61#include <sys/wait.h>
62#include <ctype.h>
63#include <locale.h>
64#include <pwd.h>
65#include <setjmp.h>
66
67#include "ed.h"
68
69
70#ifdef _POSIX_SOURCE
71sigjmp_buf env;
72#else
73jmp_buf env;
74#endif
75
76/* static buffers */
77char stdinbuf[1]; /* stdin buffer */
78char *shcmd; /* shell command buffer */
79int shcmdsz; /* shell command buffer size */
80int shcmdi; /* shell command buffer index */
81char *ibuf; /* ed command-line buffer */
82int ibufsz; /* ed command-line buffer size */
83char *ibufp; /* pointer to ed command-line buffer */
84
85/* global flags */
86int des = 0; /* if set, use crypt(3) for i/o */
87int garrulous = 0; /* if set, print all error messages */
88int isbinary; /* if set, buffer contains ASCII NULs */
89int isglobal; /* if set, doing a global command */
90int modified; /* if set, buffer modified since last write */
91int mutex = 0; /* if set, signals set "sigflags" */
92int red = 0; /* if set, restrict shell/directory access */
93int scripted = 0; /* if set, suppress diagnostics */
94int sigflags = 0; /* if set, signals received while mutex set */
95int sigactive = 0; /* if set, signal handlers are enabled */
96
97char old_filename[MAXPATHLEN + 1] = ""; /* default filename */
98long current_addr; /* current address in editor buffer */
99long addr_last; /* last address in editor buffer */
100int lineno; /* script line number */
101char *prompt; /* command-line prompt */
102char *dps = "*"; /* default command-line prompt */
103
104char *usage = "usage: %s [-] [-sx] [-p string] [name]\n";
105
106/* ed: line editor */
107int
108main(argc, argv)
109 int argc;
110 char **argv;
111{
112 int c, n;
113 long status = 0;
114#if __GNUC__
115 /* Avoid longjmp clobbering */
116 (void) &argc;
117 (void) &argv;
118#endif
119
120 (void)setlocale(LC_ALL, "");
121
122 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
123top:
124 while ((c = getopt(argc, argv, "p:sx")) != -1)
125 switch(c) {
126 case 'p': /* set prompt */
127 prompt = optarg;
128 break;
129 case 's': /* run script */
130 scripted = 1;
131 break;
132 case 'x': /* use crypt */
133#ifdef DES
134 des = get_keyword();
135#else
136 fprintf(stderr, "crypt unavailable\n?\n");
137#endif
138 break;
139
140 default:
141 fprintf(stderr, usage, argv[0]);
142 exit(1);
143 }
144 argv += optind;
145 argc -= optind;
146 if (argc && **argv == '-') {
147 scripted = 1;
148 if (argc > 1) {
149 optind = 1;
150 goto top;
151 }
152 argv++;
153 argc--;
154 }
155 /* assert: reliable signals! */
156#ifdef SIGWINCH
157 handle_winch(SIGWINCH);
158 if (isatty(0)) signal(SIGWINCH, handle_winch);
159#endif
160 signal(SIGHUP, signal_hup);
161 signal(SIGQUIT, SIG_IGN);
162 signal(SIGINT, signal_int);
163#ifdef _POSIX_SOURCE
164 if ((status = sigsetjmp(env, 1)))
165#else
166 if ((status = setjmp(env)))
167#endif
168 {
169 fputs("\n?\n", stderr);
170 sprintf(errmsg, "interrupt");
171 } else {
172 init_buffers();
173 sigactive = 1; /* enable signal handlers */
174 if (argc && **argv && is_legal_filename(*argv)) {
175 if (read_file(*argv, 0) < 0 && !isatty(0))
176 quit(2);
177 else if (**argv != '!')
178 strcpy(old_filename, *argv);
179 } else if (argc) {
180 fputs("?\n", stderr);
181 if (**argv == '\0')
182 sprintf(errmsg, "invalid filename");
183 if (!isatty(0))
184 quit(2);
185 }
186 }
187 for (;;) {
188 if (status < 0 && garrulous)
189 fprintf(stderr, "%s\n", errmsg);
190 if (prompt) {
191 printf("%s", prompt);
192 fflush(stdout);
193 }
194 if ((n = get_tty_line()) < 0) {
195 status = ERR;
196 continue;
197 } else if (n == 0) {
198 if (modified && !scripted) {
199 fputs("?\n", stderr);
200 sprintf(errmsg, "warning: file modified");
201 if (!isatty(0)) {
202 fprintf(stderr, garrulous ?
203 "script, line %d: %s\n" :
204 "", lineno, errmsg);
205 quit(2);
206 }
207 clearerr(stdin);
208 modified = 0;
209 status = EMOD;
210 continue;
211 } else
212 quit(0);
213 } else if (ibuf[n - 1] != '\n') {
214 /* discard line */
215 sprintf(errmsg, "unexpected end-of-file");
216 clearerr(stdin);
217 status = ERR;
218 continue;
219 }
220 isglobal = 0;
221 if ((status = extract_addr_range()) >= 0 &&
222 (status = exec_command()) >= 0)
223 if (!status ||
224 (status = display_lines(current_addr, current_addr,
225 status)) >= 0)
226 continue;
227 switch (status) {
228 case EOF:
229 quit(0);
230 case EMOD:
231 modified = 0;
232 fputs("?\n", stderr); /* give warning */
233 sprintf(errmsg, "warning: file modified");
234 if (!isatty(0)) {
235 fprintf(stderr, garrulous ?
236 "script, line %d: %s\n" :
237 "", lineno, errmsg);
238 quit(2);
239 }
240 break;
241 case FATAL:
242 if (!isatty(0))
243 fprintf(stderr, garrulous ?
244 "script, line %d: %s\n" : "",
245 lineno, errmsg);
246 else
247 fprintf(stderr, garrulous ? "%s\n" : "",
248 errmsg);
249 quit(3);
250 default:
251 fputs("?\n", stderr);
252 if (!isatty(0)) {
253 fprintf(stderr, garrulous ?
254 "script, line %d: %s\n" : "",
255 lineno, errmsg);
256 quit(2);
257 }
258 break;
259 }
260 }
261 /*NOTREACHED*/
262}
263
264long first_addr, second_addr, addr_cnt;
265
266/* extract_addr_range: get line addresses from the command buffer until an
267 illegal address is seen; return status */
268int
269extract_addr_range()
270{
271 long addr;
272
273 addr_cnt = 0;
274 first_addr = second_addr = current_addr;
275 while ((addr = next_addr()) >= 0) {
276 addr_cnt++;
277 first_addr = second_addr;
278 second_addr = addr;
279 if (*ibufp != ',' && *ibufp != ';')
280 break;
281 else if (*ibufp++ == ';')
282 current_addr = addr;
283 }
284 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
285 first_addr = second_addr;
286 return (addr == ERR) ? ERR : 0;
287}
288
289
290#define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
291
292#define MUST_BE_FIRST() \
293 if (!first) { sprintf(errmsg, "invalid address"); return ERR; }
294
295/* next_addr: return the next line address in the command buffer */
296long
297next_addr()
298{
299 char *hd;
300 long addr = current_addr;
301 long n;
302 int first = 1;
303 int c;
304
305 SKIP_BLANKS();
306 for (hd = ibufp;; first = 0)
307 switch (c = *ibufp) {
308 case '+':
309 case '\t':
310 case ' ':
311 case '-':
312 case '^':
313 ibufp++;
314 SKIP_BLANKS();
315 if (isdigit((unsigned char)*ibufp)) {
316 STRTOL(n, ibufp);
317 addr += (c == '-' || c == '^') ? -n : n;
318 } else if (!isspace((unsigned char)c))
319 addr += (c == '-' || c == '^') ? -1 : 1;
320 break;
321 case '0': case '1': case '2':
322 case '3': case '4': case '5':
323 case '6': case '7': case '8': case '9':
324 MUST_BE_FIRST();
325 STRTOL(addr, ibufp);
326 break;
327 case '.':
328 case '$':
329 MUST_BE_FIRST();
330 ibufp++;
331 addr = (c == '.') ? current_addr : addr_last;
332 break;
333 case '/':
334 case '?':
335 MUST_BE_FIRST();
336 if ((addr = get_matching_node_addr(
337 get_compiled_pattern(), c == '/')) < 0)
338 return ERR;
339 else if (c == *ibufp)
340 ibufp++;
341 break;
342 case '\'':
343 MUST_BE_FIRST();
344 ibufp++;
345 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
346 return ERR;
347 break;
348 case '%':
349 case ',':
350 case ';':
351 if (first) {
352 ibufp++;
353 addr_cnt++;
354 second_addr = (c == ';') ? current_addr : 1;
355 addr = addr_last;
356 break;
357 }
358 /* FALL THROUGH */
359 default:
360 if (ibufp == hd)
361 return EOF;
362 else if (addr < 0 || addr_last < addr) {
363 sprintf(errmsg, "invalid address");
364 return ERR;
365 } else
366 return addr;
367 }
368 /* NOTREACHED */
369}
370
371
372#ifdef BACKWARDS
373/* GET_THIRD_ADDR: get a legal address from the command buffer */
374#define GET_THIRD_ADDR(addr) \
375{ \
376 long ol1, ol2; \
377\
378 ol1 = first_addr, ol2 = second_addr; \
379 if (extract_addr_range() < 0) \
380 return ERR; \
381 else if (addr_cnt == 0) { \
382 sprintf(errmsg, "destination expected"); \
383 return ERR; \
384 } else if (second_addr < 0 || addr_last < second_addr) { \
385 sprintf(errmsg, "invalid address"); \
386 return ERR; \
387 } \
388 addr = second_addr; \
389 first_addr = ol1, second_addr = ol2; \
390}
391#else /* BACKWARDS */
392/* GET_THIRD_ADDR: get a legal address from the command buffer */
393#define GET_THIRD_ADDR(addr) \
394{ \
395 long ol1, ol2; \
396\
397 ol1 = first_addr, ol2 = second_addr; \
398 if (extract_addr_range() < 0) \
399 return ERR; \
400 if (second_addr < 0 || addr_last < second_addr) { \
401 sprintf(errmsg, "invalid address"); \
402 return ERR; \
403 } \
404 addr = second_addr; \
405 first_addr = ol1, second_addr = ol2; \
406}
407#endif
408
409
410/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
411#define GET_COMMAND_SUFFIX() { \
412 int done = 0; \
413 do { \
414 switch(*ibufp) { \
415 case 'p': \
416 gflag |= GPR, ibufp++; \
417 break; \
418 case 'l': \
419 gflag |= GLS, ibufp++; \
420 break; \
421 case 'n': \
422 gflag |= GNP, ibufp++; \
423 break; \
424 default: \
425 done++; \
426 } \
427 } while (!done); \
428 if (*ibufp++ != '\n') { \
429 sprintf(errmsg, "invalid command suffix"); \
430 return ERR; \
431 } \
432}
433
434
435/* sflags */
436#define SGG 001 /* complement previous global substitute suffix */
437#define SGP 002 /* complement previous print suffix */
438#define SGR 004 /* use last regex instead of last pat */
439#define SGF 010 /* repeat last substitution */
440
441int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
442
443long rows = 22; /* scroll length: ws_row - 2 */
444
445/* exec_command: execute the next command in command buffer; return print
446 request, if any */
447int
448exec_command()
449{
450 extern long u_current_addr;
451 extern long u_addr_last;
452
453 static pattern_t *pat = NULL;
454 static int sgflag = 0;
455 static long sgnum = 0;
456
457 pattern_t *tpat;
458 char *fnp;
459 int gflag = 0;
460 int sflags = 0;
461 long addr = 0;
462 int n = 0;
463 int c;
464
465 SKIP_BLANKS();
466 switch(c = *ibufp++) {
467 case 'a':
468 GET_COMMAND_SUFFIX();
469 if (!isglobal) clear_undo_stack();
470 if (append_lines(second_addr) < 0)
471 return ERR;
472 break;
473 case 'c':
474 if (check_addr_range(current_addr, current_addr) < 0)
475 return ERR;
476 GET_COMMAND_SUFFIX();
477 if (!isglobal) clear_undo_stack();
478 if (delete_lines(first_addr, second_addr) < 0 ||
479 append_lines(current_addr) < 0)
480 return ERR;
481 break;
482 case 'd':
483 if (check_addr_range(current_addr, current_addr) < 0)
484 return ERR;
485 GET_COMMAND_SUFFIX();
486 if (!isglobal) clear_undo_stack();
487 if (delete_lines(first_addr, second_addr) < 0)
488 return ERR;
489 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
490 current_addr = addr;
491 break;
492 case 'e':
493 if (modified && !scripted)
494 return EMOD;
495 /* fall through */
496 case 'E':
497 if (addr_cnt > 0) {
498 sprintf(errmsg, "unexpected address");
499 return ERR;
500 } else if (!isspace((unsigned char)*ibufp)) {
501 sprintf(errmsg, "unexpected command suffix");
502 return ERR;
503 } else if ((fnp = get_filename()) == NULL)
504 return ERR;
505 GET_COMMAND_SUFFIX();
506 if (delete_lines(1, addr_last) < 0)
507 return ERR;
508 clear_undo_stack();
509 if (close_sbuf() < 0)
510 return ERR;
511 else if (open_sbuf() < 0)
512 return FATAL;
513 if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
514#ifdef BACKWARDS
515 if (*fnp == '\0' && *old_filename == '\0') {
516 sprintf(errmsg, "no current filename");
517 return ERR;
518 }
519#endif
520 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
521 return ERR;
522 clear_undo_stack();
523 modified = 0;
524 u_current_addr = u_addr_last = -1;
525 break;
526 case 'f':
527 if (addr_cnt > 0) {
528 sprintf(errmsg, "unexpected address");
529 return ERR;
530 } else if (!isspace((unsigned char)*ibufp)) {
531 sprintf(errmsg, "unexpected command suffix");
532 return ERR;
533 } else if ((fnp = get_filename()) == NULL)
534 return ERR;
535 else if (*fnp == '!') {
536 sprintf(errmsg, "invalid redirection");
537 return ERR;
538 }
539 GET_COMMAND_SUFFIX();
540 if (*fnp) strcpy(old_filename, fnp);
541 printf("%s\n", strip_escapes(old_filename));
542 break;
543 case 'g':
544 case 'v':
545 case 'G':
546 case 'V':
547 if (isglobal) {
548 sprintf(errmsg, "cannot nest global commands");
549 return ERR;
550 } else if (check_addr_range(1, addr_last) < 0)
551 return ERR;
552 else if (build_active_list(c == 'g' || c == 'G') < 0)
553 return ERR;
554 else if ((n = (c == 'G' || c == 'V')))
555 GET_COMMAND_SUFFIX();
556 isglobal++;
557 if (exec_global(n, gflag) < 0)
558 return ERR;
559 break;
560 case 'h':
561 if (addr_cnt > 0) {
562 sprintf(errmsg, "unexpected address");
563 return ERR;
564 }
565 GET_COMMAND_SUFFIX();
566 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
567 break;
568 case 'H':
569 if (addr_cnt > 0) {
570 sprintf(errmsg, "unexpected address");
571 return ERR;
572 }
573 GET_COMMAND_SUFFIX();
574 if ((garrulous = 1 - garrulous) && *errmsg)
575 fprintf(stderr, "%s\n", errmsg);
576 break;
577 case 'i':
578 if (second_addr == 0) {
579 sprintf(errmsg, "invalid address");
580 return ERR;
581 }
582 GET_COMMAND_SUFFIX();
583 if (!isglobal) clear_undo_stack();
584 if (append_lines(second_addr - 1) < 0)
585 return ERR;
586 break;
587 case 'j':
588 if (check_addr_range(current_addr, current_addr + 1) < 0)
589 return ERR;
590 GET_COMMAND_SUFFIX();
591 if (!isglobal) clear_undo_stack();
592 if (first_addr != second_addr &&
593 join_lines(first_addr, second_addr) < 0)
594 return ERR;
595 break;
596 case 'k':
597 c = *ibufp++;
598 if (second_addr == 0) {
599 sprintf(errmsg, "invalid address");
600 return ERR;
601 }
602 GET_COMMAND_SUFFIX();
603 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
604 return ERR;
605 break;
606 case 'l':
607 if (check_addr_range(current_addr, current_addr) < 0)
608 return ERR;
609 GET_COMMAND_SUFFIX();
610 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
611 return ERR;
612 gflag = 0;
613 break;
614 case 'm':
615 if (check_addr_range(current_addr, current_addr) < 0)
616 return ERR;
617 GET_THIRD_ADDR(addr);
618 if (first_addr <= addr && addr < second_addr) {
619 sprintf(errmsg, "invalid destination");
620 return ERR;
621 }
622 GET_COMMAND_SUFFIX();
623 if (!isglobal) clear_undo_stack();
624 if (move_lines(addr) < 0)
625 return ERR;
626 break;
627 case 'n':
628 if (check_addr_range(current_addr, current_addr) < 0)
629 return ERR;
630 GET_COMMAND_SUFFIX();
631 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
632 return ERR;
633 gflag = 0;
634 break;
635 case 'p':
636 if (check_addr_range(current_addr, current_addr) < 0)
637 return ERR;
638 GET_COMMAND_SUFFIX();
639 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
640 return ERR;
641 gflag = 0;
642 break;
643 case 'P':
644 if (addr_cnt > 0) {
645 sprintf(errmsg, "unexpected address");
646 return ERR;
647 }
648 GET_COMMAND_SUFFIX();
649 prompt = prompt ? NULL : optarg ? optarg : dps;
650 break;
651 case 'q':
652 case 'Q':
653 if (addr_cnt > 0) {
654 sprintf(errmsg, "unexpected address");
655 return ERR;
656 }
657 GET_COMMAND_SUFFIX();
658 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
659 break;
660 case 'r':
661 if (!isspace((unsigned char)*ibufp)) {
662 sprintf(errmsg, "unexpected command suffix");
663 return ERR;
664 } else if (addr_cnt == 0)
665 second_addr = addr_last;
666 if ((fnp = get_filename()) == NULL)
667 return ERR;
668 GET_COMMAND_SUFFIX();
669 if (!isglobal) clear_undo_stack();
670 if (*old_filename == '\0' && *fnp != '!')
671 strcpy(old_filename, fnp);
672#ifdef BACKWARDS
673 if (*fnp == '\0' && *old_filename == '\0') {
674 sprintf(errmsg, "no current filename");
675 return ERR;
676 }
677#endif
678 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
679 return ERR;
680 else if (addr && addr != addr_last)
681 modified = 1;
682 break;
683 case 's':
684 do {
685 switch(*ibufp) {
686 case '\n':
687 sflags |=SGF;
688 break;
689 case 'g':
690 sflags |= SGG;
691 ibufp++;
692 break;
693 case 'p':
694 sflags |= SGP;
695 ibufp++;
696 break;
697 case 'r':
698 sflags |= SGR;
699 ibufp++;
700 break;
701 case '0': case '1': case '2': case '3': case '4':
702 case '5': case '6': case '7': case '8': case '9':
703 STRTOL(sgnum, ibufp);
704 sflags |= SGF;
705 sgflag &= ~GSG; /* override GSG */
706 break;
707 default:
708 if (sflags) {
709 sprintf(errmsg, "invalid command suffix");
710 return ERR;
711 }
712 }
713 } while (sflags && *ibufp != '\n');
714 if (sflags && !pat) {
715 sprintf(errmsg, "no previous substitution");
716 return ERR;
717 } else if (sflags & SGG)
718 sgnum = 0; /* override numeric arg */
719 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
720 sprintf(errmsg, "invalid pattern delimiter");
721 return ERR;
722 }
723 tpat = pat;
724 SPL1();
725 if ((!sflags || (sflags & SGR)) &&
726 (tpat = get_compiled_pattern()) == NULL) {
727 SPL0();
728 return ERR;
729 } else if (tpat != pat) {
730 if (pat) {
731 regfree(pat);
732 free(pat);
733 }
734 pat = tpat;
735 patlock = 1; /* reserve pattern */
736 }
737 SPL0();
738 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
739 return ERR;
740 else if (isglobal)
741 sgflag |= GLB;
742 else
743 sgflag &= ~GLB;
744 if (sflags & SGG)
745 sgflag ^= GSG;
746 if (sflags & SGP)
747 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
748 do {
749 switch(*ibufp) {
750 case 'p':
751 sgflag |= GPR, ibufp++;
752 break;
753 case 'l':
754 sgflag |= GLS, ibufp++;
755 break;
756 case 'n':
757 sgflag |= GNP, ibufp++;
758 break;
759 default:
760 n++;
761 }
762 } while (!n);
763 if (check_addr_range(current_addr, current_addr) < 0)
764 return ERR;
765 GET_COMMAND_SUFFIX();
766 if (!isglobal) clear_undo_stack();
767 if (search_and_replace(pat, sgflag, sgnum) < 0)
768 return ERR;
769 break;
770 case 't':
771 if (check_addr_range(current_addr, current_addr) < 0)
772 return ERR;
773 GET_THIRD_ADDR(addr);
774 GET_COMMAND_SUFFIX();
775 if (!isglobal) clear_undo_stack();
776 if (copy_lines(addr) < 0)
777 return ERR;
778 break;
779 case 'u':
780 if (addr_cnt > 0) {
781 sprintf(errmsg, "unexpected address");
782 return ERR;
783 }
784 GET_COMMAND_SUFFIX();
785 if (pop_undo_stack() < 0)
786 return ERR;
787 break;
788 case 'w':
789 case 'W':
790 if ((n = *ibufp) == 'q' || n == 'Q') {
791 gflag = EOF;
792 ibufp++;
793 }
794 if (!isspace((unsigned char)*ibufp)) {
795 sprintf(errmsg, "unexpected command suffix");
796 return ERR;
797 } else if ((fnp = get_filename()) == NULL)
798 return ERR;
799 if (addr_cnt == 0 && !addr_last)
800 first_addr = second_addr = 0;
801 else if (check_addr_range(1, addr_last) < 0)
802 return ERR;
803 GET_COMMAND_SUFFIX();
804 if (*old_filename == '\0' && *fnp != '!')
805 strcpy(old_filename, fnp);
806#ifdef BACKWARDS
807 if (*fnp == '\0' && *old_filename == '\0') {
808 sprintf(errmsg, "no current filename");
809 return ERR;
810 }
811#endif
812 if ((addr = write_file(*fnp ? fnp : old_filename,
813 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
814 return ERR;
815 else if (addr == addr_last)
816 modified = 0;
817 else if (modified && !scripted && n == 'q')
818 gflag = EMOD;
819 break;
820 case 'x':
821 if (addr_cnt > 0) {
822 sprintf(errmsg, "unexpected address");
823 return ERR;
824 }
825 GET_COMMAND_SUFFIX();
826#ifdef DES
827 des = get_keyword();
828#else
829 sprintf(errmsg, "crypt unavailable");
830 return ERR;
831#endif
832 break;
833 case 'z':
834#ifdef BACKWARDS
835 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
836#else
837 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
838#endif
839 return ERR;
840 else if ('0' < *ibufp && *ibufp <= '9')
841 STRTOL(rows, ibufp);
842 GET_COMMAND_SUFFIX();
843 if (display_lines(second_addr, min(addr_last,
844 second_addr + rows), gflag) < 0)
845 return ERR;
846 gflag = 0;
847 break;
848 case '=':
849 GET_COMMAND_SUFFIX();
850 printf("%ld\n", addr_cnt ? second_addr : addr_last);
851 break;
852 case '!':
853 if (addr_cnt > 0) {
854 sprintf(errmsg, "unexpected address");
855 return ERR;
856 } else if ((sflags = get_shell_command()) < 0)
857 return ERR;
858 GET_COMMAND_SUFFIX();
859 if (sflags) printf("%s\n", shcmd + 1);
860 system(shcmd + 1);
861 if (!scripted) printf("!\n");
862 break;
863 case '\n':
864#ifdef BACKWARDS
865 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
866#else
867 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
868#endif
869 || display_lines(second_addr, second_addr, 0) < 0)
870 return ERR;
871 break;
872 default:
873 sprintf(errmsg, "unknown command");
874 return ERR;
875 }
876 return gflag;
877}
878
879
880/* check_addr_range: return status of address range check */
881int
882check_addr_range(n, m)
883 long n, m;
884{
885 if (addr_cnt == 0) {
886 first_addr = n;
887 second_addr = m;
888 }
889 if (first_addr > second_addr || 1 > first_addr ||
890 second_addr > addr_last) {
891 sprintf(errmsg, "invalid address");
892 return ERR;
893 }
894 return 0;
895}
896
897
898/* get_matching_node_addr: return the address of the next line matching a
899 pattern in a given direction. wrap around begin/end of editor buffer if
900 necessary */
901long
902get_matching_node_addr(pat, dir)
903 pattern_t *pat;
904 int dir;
905{
906 char *s;
907 long n = current_addr;
908 line_t *lp;
909
910 if (!pat) return ERR;
911 do {
912 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
913 lp = get_addressed_line_node(n);
914 if ((s = get_sbuf_line(lp)) == NULL)
915 return ERR;
916 if (isbinary)
917 NUL_TO_NEWLINE(s, lp->len);
918 if (!regexec(pat, s, 0, NULL, 0))
919 return n;
920 }
921 } while (n != current_addr);
922 sprintf(errmsg, "no match");
923 return ERR;
924}
925
926
927/* get_filename: return pointer to copy of filename in the command buffer */
928char *
929get_filename()
930{
931 static char *file = NULL;
932 static int filesz = 0;
933
934 int n;
935
936 if (*ibufp != '\n') {
937 SKIP_BLANKS();
938 if (*ibufp == '\n') {
939 sprintf(errmsg, "invalid filename");
940 return NULL;
941 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
942 return NULL;
943 else if (*ibufp == '!') {
944 ibufp++;
945 if ((n = get_shell_command()) < 0)
946 return NULL;
947 if (n) printf("%s\n", shcmd + 1);
948 return shcmd;
949 } else if (n - 1 > MAXPATHLEN) {
950 sprintf(errmsg, "filename too long");
951 return NULL;
952 }
953 }
954#ifndef BACKWARDS
955 else if (*old_filename == '\0') {
956 sprintf(errmsg, "no current filename");
957 return NULL;
958 }
959#endif
960 REALLOC(file, filesz, MAXPATHLEN + 1, NULL);
961 for (n = 0; *ibufp != '\n';)
962 file[n++] = *ibufp++;
963 file[n] = '\0';
964 return is_legal_filename(file) ? file : NULL;
965}
966
967
968/* get_shell_command: read a shell command from stdin; return substitution
969 status */
970int
971get_shell_command()
972{
973 static char *buf = NULL;
974 static int n = 0;
975
976 char *s; /* substitution char pointer */
977 int i = 0;
978 int j = 0;
979
980 if (red) {
981 sprintf(errmsg, "shell access restricted");
982 return ERR;
983 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
984 return ERR;
985 REALLOC(buf, n, j + 1, ERR);
986 buf[i++] = '!'; /* prefix command w/ bang */
987 while (*ibufp != '\n')
988 switch (*ibufp) {
989 default:
990 REALLOC(buf, n, i + 2, ERR);
991 buf[i++] = *ibufp;
992 if (*ibufp++ == '\\')
993 buf[i++] = *ibufp++;
994 break;
995 case '!':
996 if (s != ibufp) {
997 REALLOC(buf, n, i + 1, ERR);
998 buf[i++] = *ibufp++;
999 }
1000#ifdef BACKWARDS
1001 else if (shcmd == NULL || *(shcmd + 1) == '\0')
1002#else
1003 else if (shcmd == NULL)
1004#endif
1005 {
1006 sprintf(errmsg, "no previous command");
1007 return ERR;
1008 } else {
1009 REALLOC(buf, n, i + shcmdi, ERR);
1010 for (s = shcmd + 1; s < shcmd + shcmdi;)
1011 buf[i++] = *s++;
1012 s = ibufp++;
1013 }
1014 break;
1015 case '%':
1016 if (*old_filename == '\0') {
1017 sprintf(errmsg, "no current filename");
1018 return ERR;
1019 }
1020 j = strlen(s = strip_escapes(old_filename));
1021 REALLOC(buf, n, i + j, ERR);
1022 while (j--)
1023 buf[i++] = *s++;
1024 s = ibufp++;
1025 break;
1026 }
1027 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1028 memcpy(shcmd, buf, i);
1029 shcmd[shcmdi = i] = '\0';
1030 return *s == '!' || *s == '%';
1031}
1032
1033
1034/* append_lines: insert text from stdin to after line n; stop when either a
1035 single period is read or EOF; return status */
1036int
1037append_lines(n)
1038 long n;
1039{
1040 int l;
1041 char *lp = ibuf;
1042 char *eot;
1043 undo_t *up = NULL;
1044
1045 for (current_addr = n;;) {
1046 if (!isglobal) {
1047 if ((l = get_tty_line()) < 0)
1048 return ERR;
1049 else if (l == 0 || ibuf[l - 1] != '\n') {
1050 clearerr(stdin);
1051 return l ? EOF : 0;
1052 }
1053 lp = ibuf;
1054 } else if (*(lp = ibufp) == '\0')
1055 return 0;
1056 else {
1057 while (*ibufp++ != '\n')
1058 ;
1059 l = ibufp - lp;
1060 }
1061 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1062 return 0;
1063 }
1064 eot = lp + l;
1065 SPL1();
1066 do {
1067 if ((lp = put_sbuf_line(lp)) == NULL) {
1068 SPL0();
1069 return ERR;
1070 } else if (up)
1071 up->t = get_addressed_line_node(current_addr);
1072 else if ((up = push_undo_stack(UADD, current_addr,
1073 current_addr)) == NULL) {
1074 SPL0();
1075 return ERR;
1076 }
1077 } while (lp != eot);
1078 modified = 1;
1079 SPL0();
1080 }
1081 /* NOTREACHED */
1082}
1083
1084
1085/* join_lines: replace a range of lines with the joined text of those lines */
1086int
1087join_lines(from, to)
1088 long from;
1089 long to;
1090{
1091 static char *buf = NULL;
1092 static int n;
1093
1094 char *s;
1095 int size = 0;
1096 line_t *bp, *ep;
1097
1098 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1099 bp = get_addressed_line_node(from);
1100 for (; bp != ep; bp = bp->q_forw) {
1101 if ((s = get_sbuf_line(bp)) == NULL)
1102 return ERR;
1103 REALLOC(buf, n, size + bp->len, ERR);
1104 memcpy(buf + size, s, bp->len);
1105 size += bp->len;
1106 }
1107 REALLOC(buf, n, size + 2, ERR);
1108 memcpy(buf + size, "\n", 2);
1109 if (delete_lines(from, to) < 0)
1110 return ERR;
1111 current_addr = from - 1;
1112 SPL1();
1113 if (put_sbuf_line(buf) == NULL ||
1114 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1115 SPL0();
1116 return ERR;
1117 }
1118 modified = 1;
1119 SPL0();
1120 return 0;
1121}
1122
1123
1124/* move_lines: move a range of lines */
1125int
1126move_lines(addr)
1127 long addr;
1128{
1129 line_t *b1, *a1, *b2, *a2;
1130 long n = INC_MOD(second_addr, addr_last);
1131 long p = first_addr - 1;
1132 int done = (addr == first_addr - 1 || addr == second_addr);
1133
1134 SPL1();
1135 if (done) {
1136 a2 = get_addressed_line_node(n);
1137 b2 = get_addressed_line_node(p);
1138 current_addr = second_addr;
1139 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1140 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1141 SPL0();
1142 return ERR;
1143 } else {
1144 a1 = get_addressed_line_node(n);
1145 if (addr < first_addr) {
1146 b1 = get_addressed_line_node(p);
1147 b2 = get_addressed_line_node(addr);
1148 /* this get_addressed_line_node last! */
1149 } else {
1150 b2 = get_addressed_line_node(addr);
1151 b1 = get_addressed_line_node(p);
1152 /* this get_addressed_line_node last! */
1153 }
1154 a2 = b2->q_forw;
1155 REQUE(b2, b1->q_forw);
1156 REQUE(a1->q_back, a2);
1157 REQUE(b1, a1);
1158 current_addr = addr + ((addr < first_addr) ?
1159 second_addr - first_addr + 1 : 0);
1160 }
1161 if (isglobal)
1162 unset_active_nodes(b2->q_forw, a2);
1163 modified = 1;
1164 SPL0();
1165 return 0;
1166}
1167
1168
1169/* copy_lines: copy a range of lines; return status */
1170int
1171copy_lines(addr)
1172 long addr;
1173{
1174 line_t *lp, *np = get_addressed_line_node(first_addr);
1175 undo_t *up = NULL;
1176 long n = second_addr - first_addr + 1;
1177 long m = 0;
1178
1179 current_addr = addr;
1180 if (first_addr <= addr && addr < second_addr) {
1181 n = addr - first_addr + 1;
1182 m = second_addr - addr;
1183 }
1184 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1185 for (; n-- > 0; np = np->q_forw) {
1186 SPL1();
1187 if ((lp = dup_line_node(np)) == NULL) {
1188 SPL0();
1189 return ERR;
1190 }
1191 add_line_node(lp);
1192 if (up)
1193 up->t = lp;
1194 else if ((up = push_undo_stack(UADD, current_addr,
1195 current_addr)) == NULL) {
1196 SPL0();
1197 return ERR;
1198 }
1199 modified = 1;
1200 SPL0();
1201 }
1202 return 0;
1203}
1204
1205
1206/* delete_lines: delete a range of lines */
1207int
1208delete_lines(from, to)
1209 long from, to;
1210{
1211 line_t *n, *p;
1212
1213 SPL1();
1214 if (push_undo_stack(UDEL, from, to) == NULL) {
1215 SPL0();
1216 return ERR;
1217 }
1218 n = get_addressed_line_node(INC_MOD(to, addr_last));
1219 p = get_addressed_line_node(from - 1);
1220 /* this get_addressed_line_node last! */
1221 if (isglobal)
1222 unset_active_nodes(p->q_forw, n);
1223 REQUE(p, n);
1224 addr_last -= to - from + 1;
1225 current_addr = from - 1;
1226 modified = 1;
1227 SPL0();
1228 return 0;
1229}
1230
1231
1232/* display_lines: print a range of lines to stdout */
1233int
1234display_lines(from, to, gflag)
1235 long from;
1236 long to;
1237 int gflag;
1238{
1239 line_t *bp;
1240 line_t *ep;
1241 char *s;
1242
1243 if (!from) {
1244 sprintf(errmsg, "invalid address");
1245 return ERR;
1246 }
1247 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1248 bp = get_addressed_line_node(from);
1249 for (; bp != ep; bp = bp->q_forw) {
1250 if ((s = get_sbuf_line(bp)) == NULL)
1251 return ERR;
1252 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1253 return ERR;
1254 }
1255 return 0;
1256}
1257
1258
1259#define MAXMARK 26 /* max number of marks */
1260
1261line_t *mark[MAXMARK]; /* line markers */
1262int markno; /* line marker count */
1263
1264/* mark_line_node: set a line node mark */
1265int
1266mark_line_node(lp, n)
1267 line_t *lp;
1268 int n;
1269{
1270 if (!islower((unsigned char)n)) {
1271 sprintf(errmsg, "invalid mark character");
1272 return ERR;
1273 } else if (mark[n - 'a'] == NULL)
1274 markno++;
1275 mark[n - 'a'] = lp;
1276 return 0;
1277}
1278
1279
1280/* get_marked_node_addr: return address of a marked line */
1281long
1282get_marked_node_addr(n)
1283 int n;
1284{
1285 if (!islower((unsigned char)n)) {
1286 sprintf(errmsg, "invalid mark character");
1287 return ERR;
1288 }
1289 return get_line_node_addr(mark[n - 'a']);
1290}
1291
1292
1293/* unmark_line_node: clear line node mark */
1294void
1295unmark_line_node(lp)
1296 line_t *lp;
1297{
1298 int i;
1299
1300 for (i = 0; markno && i < MAXMARK; i++)
1301 if (mark[i] == lp) {
1302 mark[i] = NULL;
1303 markno--;
1304 }
1305}
1306
1307
1308/* dup_line_node: return a pointer to a copy of a line node */
1309line_t *
1310dup_line_node(lp)
1311 line_t *lp;
1312{
1313 line_t *np;
1314
1315 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1316 fprintf(stderr, "%s\n", strerror(errno));
1317 sprintf(errmsg, "out of memory");
1318 return NULL;
1319 }
1320 np->seek = lp->seek;
1321 np->len = lp->len;
1322 return np;
1323}
1324
1325
1326/* has_trailing_escape: return the parity of escapes preceding a character
1327 in a string */
1328int
1329has_trailing_escape(s, t)
1330 char *s;
1331 char *t;
1332{
1333 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1334}
1335
1336
1337/* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */
1338char *
1339strip_escapes(s)
1340 char *s;
1341{
1342 static char *file = NULL;
1343 static int filesz = 0;
1344
1345 int i = 0;
1346
1347 REALLOC(file, filesz, MAXPATHLEN + 1, NULL);
1348 /* assert: no trailing escape */
1349 while ((file[i++] = (*s == '\\') ? *++s : *s))
1350 s++;
1351 return file;
1352}
1353
1354
1355void
1356signal_hup(signo)
1357 int signo;
1358{
1359 if (mutex)
1360 sigflags |= (1 << (signo - 1));
1361 else
1362 handle_hup(signo);
1363}
1364
1365
1366void
1367signal_int(signo)
1368 int signo;
1369{
1370 if (mutex)
1371 sigflags |= (1 << (signo - 1));
1372 else
1373 handle_int(signo);
1374}
1375
1376
1377void
1378handle_hup(signo)
1379 int signo;
1380{
1381 char *hup = NULL; /* hup filename */
1382 char *s;
1383 int n;
1384
1385 if (!sigactive)
1386 quit(1);
1387 sigflags &= ~(1 << (signo - 1));
1388 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 &&
1389 (s = getenv("HOME")) != NULL &&
1390 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */
1391 (hup = (char *) malloc(n + 10)) != NULL) {
1392 strcpy(hup, s);
1393 if (hup[n - 1] != '/')
1394 hup[n] = '/', hup[n+1] = '\0';
1395 strcat(hup, "ed.hup");
1396 write_file(hup, "w", 1, addr_last);
1397 }
1398 quit(2);
1399}
1400
1401
1402void
1403handle_int(signo)
1404 int signo;
1405{
1406 if (!sigactive)
1407 quit(1);
1408 sigflags &= ~(1 << (signo - 1));
1409#ifdef _POSIX_SOURCE
1410 siglongjmp(env, -1);
1411#else
1412 longjmp(env, -1);
1413#endif
1414}
1415
1416
1417int cols = 72; /* wrap column */
1418
1419void
1420handle_winch(signo)
1421 int signo;
1422{
1423 int save_errno = errno;
1424
1425 struct winsize ws; /* window size structure */
1426
1427 sigflags &= ~(1 << (signo - 1));
1428 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1429 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1430 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1431 }
1432 errno = save_errno;
1433}
1434
1435
1436/* is_legal_filename: return a legal filename */
1437int
1438is_legal_filename(s)
1439 char *s;
1440{
1441 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1442 sprintf(errmsg, "shell access restricted");
1443 return 0;
1444 }
1445 return 1;
1446}
| 41#endif
42#endif /* not lint */
43
44/*
45 * CREDITS
46 *
47 * This program is based on the editor algorithm described in
48 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
49 * in Pascal," Addison-Wesley, 1981.
50 *
51 * The buffering algorithm is attributed to Rodney Ruddock of
52 * the University of Guelph, Guelph, Ontario.
53 *
54 * The cbc.c encryption code is adapted from
55 * the bdes program by Matt Bishop of Dartmouth College,
56 * Hanover, NH.
57 *
58 */
59
60#include <sys/ioctl.h>
61#include <sys/wait.h>
62#include <ctype.h>
63#include <locale.h>
64#include <pwd.h>
65#include <setjmp.h>
66
67#include "ed.h"
68
69
70#ifdef _POSIX_SOURCE
71sigjmp_buf env;
72#else
73jmp_buf env;
74#endif
75
76/* static buffers */
77char stdinbuf[1]; /* stdin buffer */
78char *shcmd; /* shell command buffer */
79int shcmdsz; /* shell command buffer size */
80int shcmdi; /* shell command buffer index */
81char *ibuf; /* ed command-line buffer */
82int ibufsz; /* ed command-line buffer size */
83char *ibufp; /* pointer to ed command-line buffer */
84
85/* global flags */
86int des = 0; /* if set, use crypt(3) for i/o */
87int garrulous = 0; /* if set, print all error messages */
88int isbinary; /* if set, buffer contains ASCII NULs */
89int isglobal; /* if set, doing a global command */
90int modified; /* if set, buffer modified since last write */
91int mutex = 0; /* if set, signals set "sigflags" */
92int red = 0; /* if set, restrict shell/directory access */
93int scripted = 0; /* if set, suppress diagnostics */
94int sigflags = 0; /* if set, signals received while mutex set */
95int sigactive = 0; /* if set, signal handlers are enabled */
96
97char old_filename[MAXPATHLEN + 1] = ""; /* default filename */
98long current_addr; /* current address in editor buffer */
99long addr_last; /* last address in editor buffer */
100int lineno; /* script line number */
101char *prompt; /* command-line prompt */
102char *dps = "*"; /* default command-line prompt */
103
104char *usage = "usage: %s [-] [-sx] [-p string] [name]\n";
105
106/* ed: line editor */
107int
108main(argc, argv)
109 int argc;
110 char **argv;
111{
112 int c, n;
113 long status = 0;
114#if __GNUC__
115 /* Avoid longjmp clobbering */
116 (void) &argc;
117 (void) &argv;
118#endif
119
120 (void)setlocale(LC_ALL, "");
121
122 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
123top:
124 while ((c = getopt(argc, argv, "p:sx")) != -1)
125 switch(c) {
126 case 'p': /* set prompt */
127 prompt = optarg;
128 break;
129 case 's': /* run script */
130 scripted = 1;
131 break;
132 case 'x': /* use crypt */
133#ifdef DES
134 des = get_keyword();
135#else
136 fprintf(stderr, "crypt unavailable\n?\n");
137#endif
138 break;
139
140 default:
141 fprintf(stderr, usage, argv[0]);
142 exit(1);
143 }
144 argv += optind;
145 argc -= optind;
146 if (argc && **argv == '-') {
147 scripted = 1;
148 if (argc > 1) {
149 optind = 1;
150 goto top;
151 }
152 argv++;
153 argc--;
154 }
155 /* assert: reliable signals! */
156#ifdef SIGWINCH
157 handle_winch(SIGWINCH);
158 if (isatty(0)) signal(SIGWINCH, handle_winch);
159#endif
160 signal(SIGHUP, signal_hup);
161 signal(SIGQUIT, SIG_IGN);
162 signal(SIGINT, signal_int);
163#ifdef _POSIX_SOURCE
164 if ((status = sigsetjmp(env, 1)))
165#else
166 if ((status = setjmp(env)))
167#endif
168 {
169 fputs("\n?\n", stderr);
170 sprintf(errmsg, "interrupt");
171 } else {
172 init_buffers();
173 sigactive = 1; /* enable signal handlers */
174 if (argc && **argv && is_legal_filename(*argv)) {
175 if (read_file(*argv, 0) < 0 && !isatty(0))
176 quit(2);
177 else if (**argv != '!')
178 strcpy(old_filename, *argv);
179 } else if (argc) {
180 fputs("?\n", stderr);
181 if (**argv == '\0')
182 sprintf(errmsg, "invalid filename");
183 if (!isatty(0))
184 quit(2);
185 }
186 }
187 for (;;) {
188 if (status < 0 && garrulous)
189 fprintf(stderr, "%s\n", errmsg);
190 if (prompt) {
191 printf("%s", prompt);
192 fflush(stdout);
193 }
194 if ((n = get_tty_line()) < 0) {
195 status = ERR;
196 continue;
197 } else if (n == 0) {
198 if (modified && !scripted) {
199 fputs("?\n", stderr);
200 sprintf(errmsg, "warning: file modified");
201 if (!isatty(0)) {
202 fprintf(stderr, garrulous ?
203 "script, line %d: %s\n" :
204 "", lineno, errmsg);
205 quit(2);
206 }
207 clearerr(stdin);
208 modified = 0;
209 status = EMOD;
210 continue;
211 } else
212 quit(0);
213 } else if (ibuf[n - 1] != '\n') {
214 /* discard line */
215 sprintf(errmsg, "unexpected end-of-file");
216 clearerr(stdin);
217 status = ERR;
218 continue;
219 }
220 isglobal = 0;
221 if ((status = extract_addr_range()) >= 0 &&
222 (status = exec_command()) >= 0)
223 if (!status ||
224 (status = display_lines(current_addr, current_addr,
225 status)) >= 0)
226 continue;
227 switch (status) {
228 case EOF:
229 quit(0);
230 case EMOD:
231 modified = 0;
232 fputs("?\n", stderr); /* give warning */
233 sprintf(errmsg, "warning: file modified");
234 if (!isatty(0)) {
235 fprintf(stderr, garrulous ?
236 "script, line %d: %s\n" :
237 "", lineno, errmsg);
238 quit(2);
239 }
240 break;
241 case FATAL:
242 if (!isatty(0))
243 fprintf(stderr, garrulous ?
244 "script, line %d: %s\n" : "",
245 lineno, errmsg);
246 else
247 fprintf(stderr, garrulous ? "%s\n" : "",
248 errmsg);
249 quit(3);
250 default:
251 fputs("?\n", stderr);
252 if (!isatty(0)) {
253 fprintf(stderr, garrulous ?
254 "script, line %d: %s\n" : "",
255 lineno, errmsg);
256 quit(2);
257 }
258 break;
259 }
260 }
261 /*NOTREACHED*/
262}
263
264long first_addr, second_addr, addr_cnt;
265
266/* extract_addr_range: get line addresses from the command buffer until an
267 illegal address is seen; return status */
268int
269extract_addr_range()
270{
271 long addr;
272
273 addr_cnt = 0;
274 first_addr = second_addr = current_addr;
275 while ((addr = next_addr()) >= 0) {
276 addr_cnt++;
277 first_addr = second_addr;
278 second_addr = addr;
279 if (*ibufp != ',' && *ibufp != ';')
280 break;
281 else if (*ibufp++ == ';')
282 current_addr = addr;
283 }
284 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
285 first_addr = second_addr;
286 return (addr == ERR) ? ERR : 0;
287}
288
289
290#define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
291
292#define MUST_BE_FIRST() \
293 if (!first) { sprintf(errmsg, "invalid address"); return ERR; }
294
295/* next_addr: return the next line address in the command buffer */
296long
297next_addr()
298{
299 char *hd;
300 long addr = current_addr;
301 long n;
302 int first = 1;
303 int c;
304
305 SKIP_BLANKS();
306 for (hd = ibufp;; first = 0)
307 switch (c = *ibufp) {
308 case '+':
309 case '\t':
310 case ' ':
311 case '-':
312 case '^':
313 ibufp++;
314 SKIP_BLANKS();
315 if (isdigit((unsigned char)*ibufp)) {
316 STRTOL(n, ibufp);
317 addr += (c == '-' || c == '^') ? -n : n;
318 } else if (!isspace((unsigned char)c))
319 addr += (c == '-' || c == '^') ? -1 : 1;
320 break;
321 case '0': case '1': case '2':
322 case '3': case '4': case '5':
323 case '6': case '7': case '8': case '9':
324 MUST_BE_FIRST();
325 STRTOL(addr, ibufp);
326 break;
327 case '.':
328 case '$':
329 MUST_BE_FIRST();
330 ibufp++;
331 addr = (c == '.') ? current_addr : addr_last;
332 break;
333 case '/':
334 case '?':
335 MUST_BE_FIRST();
336 if ((addr = get_matching_node_addr(
337 get_compiled_pattern(), c == '/')) < 0)
338 return ERR;
339 else if (c == *ibufp)
340 ibufp++;
341 break;
342 case '\'':
343 MUST_BE_FIRST();
344 ibufp++;
345 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
346 return ERR;
347 break;
348 case '%':
349 case ',':
350 case ';':
351 if (first) {
352 ibufp++;
353 addr_cnt++;
354 second_addr = (c == ';') ? current_addr : 1;
355 addr = addr_last;
356 break;
357 }
358 /* FALL THROUGH */
359 default:
360 if (ibufp == hd)
361 return EOF;
362 else if (addr < 0 || addr_last < addr) {
363 sprintf(errmsg, "invalid address");
364 return ERR;
365 } else
366 return addr;
367 }
368 /* NOTREACHED */
369}
370
371
372#ifdef BACKWARDS
373/* GET_THIRD_ADDR: get a legal address from the command buffer */
374#define GET_THIRD_ADDR(addr) \
375{ \
376 long ol1, ol2; \
377\
378 ol1 = first_addr, ol2 = second_addr; \
379 if (extract_addr_range() < 0) \
380 return ERR; \
381 else if (addr_cnt == 0) { \
382 sprintf(errmsg, "destination expected"); \
383 return ERR; \
384 } else if (second_addr < 0 || addr_last < second_addr) { \
385 sprintf(errmsg, "invalid address"); \
386 return ERR; \
387 } \
388 addr = second_addr; \
389 first_addr = ol1, second_addr = ol2; \
390}
391#else /* BACKWARDS */
392/* GET_THIRD_ADDR: get a legal address from the command buffer */
393#define GET_THIRD_ADDR(addr) \
394{ \
395 long ol1, ol2; \
396\
397 ol1 = first_addr, ol2 = second_addr; \
398 if (extract_addr_range() < 0) \
399 return ERR; \
400 if (second_addr < 0 || addr_last < second_addr) { \
401 sprintf(errmsg, "invalid address"); \
402 return ERR; \
403 } \
404 addr = second_addr; \
405 first_addr = ol1, second_addr = ol2; \
406}
407#endif
408
409
410/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
411#define GET_COMMAND_SUFFIX() { \
412 int done = 0; \
413 do { \
414 switch(*ibufp) { \
415 case 'p': \
416 gflag |= GPR, ibufp++; \
417 break; \
418 case 'l': \
419 gflag |= GLS, ibufp++; \
420 break; \
421 case 'n': \
422 gflag |= GNP, ibufp++; \
423 break; \
424 default: \
425 done++; \
426 } \
427 } while (!done); \
428 if (*ibufp++ != '\n') { \
429 sprintf(errmsg, "invalid command suffix"); \
430 return ERR; \
431 } \
432}
433
434
435/* sflags */
436#define SGG 001 /* complement previous global substitute suffix */
437#define SGP 002 /* complement previous print suffix */
438#define SGR 004 /* use last regex instead of last pat */
439#define SGF 010 /* repeat last substitution */
440
441int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
442
443long rows = 22; /* scroll length: ws_row - 2 */
444
445/* exec_command: execute the next command in command buffer; return print
446 request, if any */
447int
448exec_command()
449{
450 extern long u_current_addr;
451 extern long u_addr_last;
452
453 static pattern_t *pat = NULL;
454 static int sgflag = 0;
455 static long sgnum = 0;
456
457 pattern_t *tpat;
458 char *fnp;
459 int gflag = 0;
460 int sflags = 0;
461 long addr = 0;
462 int n = 0;
463 int c;
464
465 SKIP_BLANKS();
466 switch(c = *ibufp++) {
467 case 'a':
468 GET_COMMAND_SUFFIX();
469 if (!isglobal) clear_undo_stack();
470 if (append_lines(second_addr) < 0)
471 return ERR;
472 break;
473 case 'c':
474 if (check_addr_range(current_addr, current_addr) < 0)
475 return ERR;
476 GET_COMMAND_SUFFIX();
477 if (!isglobal) clear_undo_stack();
478 if (delete_lines(first_addr, second_addr) < 0 ||
479 append_lines(current_addr) < 0)
480 return ERR;
481 break;
482 case 'd':
483 if (check_addr_range(current_addr, current_addr) < 0)
484 return ERR;
485 GET_COMMAND_SUFFIX();
486 if (!isglobal) clear_undo_stack();
487 if (delete_lines(first_addr, second_addr) < 0)
488 return ERR;
489 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
490 current_addr = addr;
491 break;
492 case 'e':
493 if (modified && !scripted)
494 return EMOD;
495 /* fall through */
496 case 'E':
497 if (addr_cnt > 0) {
498 sprintf(errmsg, "unexpected address");
499 return ERR;
500 } else if (!isspace((unsigned char)*ibufp)) {
501 sprintf(errmsg, "unexpected command suffix");
502 return ERR;
503 } else if ((fnp = get_filename()) == NULL)
504 return ERR;
505 GET_COMMAND_SUFFIX();
506 if (delete_lines(1, addr_last) < 0)
507 return ERR;
508 clear_undo_stack();
509 if (close_sbuf() < 0)
510 return ERR;
511 else if (open_sbuf() < 0)
512 return FATAL;
513 if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
514#ifdef BACKWARDS
515 if (*fnp == '\0' && *old_filename == '\0') {
516 sprintf(errmsg, "no current filename");
517 return ERR;
518 }
519#endif
520 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
521 return ERR;
522 clear_undo_stack();
523 modified = 0;
524 u_current_addr = u_addr_last = -1;
525 break;
526 case 'f':
527 if (addr_cnt > 0) {
528 sprintf(errmsg, "unexpected address");
529 return ERR;
530 } else if (!isspace((unsigned char)*ibufp)) {
531 sprintf(errmsg, "unexpected command suffix");
532 return ERR;
533 } else if ((fnp = get_filename()) == NULL)
534 return ERR;
535 else if (*fnp == '!') {
536 sprintf(errmsg, "invalid redirection");
537 return ERR;
538 }
539 GET_COMMAND_SUFFIX();
540 if (*fnp) strcpy(old_filename, fnp);
541 printf("%s\n", strip_escapes(old_filename));
542 break;
543 case 'g':
544 case 'v':
545 case 'G':
546 case 'V':
547 if (isglobal) {
548 sprintf(errmsg, "cannot nest global commands");
549 return ERR;
550 } else if (check_addr_range(1, addr_last) < 0)
551 return ERR;
552 else if (build_active_list(c == 'g' || c == 'G') < 0)
553 return ERR;
554 else if ((n = (c == 'G' || c == 'V')))
555 GET_COMMAND_SUFFIX();
556 isglobal++;
557 if (exec_global(n, gflag) < 0)
558 return ERR;
559 break;
560 case 'h':
561 if (addr_cnt > 0) {
562 sprintf(errmsg, "unexpected address");
563 return ERR;
564 }
565 GET_COMMAND_SUFFIX();
566 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
567 break;
568 case 'H':
569 if (addr_cnt > 0) {
570 sprintf(errmsg, "unexpected address");
571 return ERR;
572 }
573 GET_COMMAND_SUFFIX();
574 if ((garrulous = 1 - garrulous) && *errmsg)
575 fprintf(stderr, "%s\n", errmsg);
576 break;
577 case 'i':
578 if (second_addr == 0) {
579 sprintf(errmsg, "invalid address");
580 return ERR;
581 }
582 GET_COMMAND_SUFFIX();
583 if (!isglobal) clear_undo_stack();
584 if (append_lines(second_addr - 1) < 0)
585 return ERR;
586 break;
587 case 'j':
588 if (check_addr_range(current_addr, current_addr + 1) < 0)
589 return ERR;
590 GET_COMMAND_SUFFIX();
591 if (!isglobal) clear_undo_stack();
592 if (first_addr != second_addr &&
593 join_lines(first_addr, second_addr) < 0)
594 return ERR;
595 break;
596 case 'k':
597 c = *ibufp++;
598 if (second_addr == 0) {
599 sprintf(errmsg, "invalid address");
600 return ERR;
601 }
602 GET_COMMAND_SUFFIX();
603 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
604 return ERR;
605 break;
606 case 'l':
607 if (check_addr_range(current_addr, current_addr) < 0)
608 return ERR;
609 GET_COMMAND_SUFFIX();
610 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
611 return ERR;
612 gflag = 0;
613 break;
614 case 'm':
615 if (check_addr_range(current_addr, current_addr) < 0)
616 return ERR;
617 GET_THIRD_ADDR(addr);
618 if (first_addr <= addr && addr < second_addr) {
619 sprintf(errmsg, "invalid destination");
620 return ERR;
621 }
622 GET_COMMAND_SUFFIX();
623 if (!isglobal) clear_undo_stack();
624 if (move_lines(addr) < 0)
625 return ERR;
626 break;
627 case 'n':
628 if (check_addr_range(current_addr, current_addr) < 0)
629 return ERR;
630 GET_COMMAND_SUFFIX();
631 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
632 return ERR;
633 gflag = 0;
634 break;
635 case 'p':
636 if (check_addr_range(current_addr, current_addr) < 0)
637 return ERR;
638 GET_COMMAND_SUFFIX();
639 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
640 return ERR;
641 gflag = 0;
642 break;
643 case 'P':
644 if (addr_cnt > 0) {
645 sprintf(errmsg, "unexpected address");
646 return ERR;
647 }
648 GET_COMMAND_SUFFIX();
649 prompt = prompt ? NULL : optarg ? optarg : dps;
650 break;
651 case 'q':
652 case 'Q':
653 if (addr_cnt > 0) {
654 sprintf(errmsg, "unexpected address");
655 return ERR;
656 }
657 GET_COMMAND_SUFFIX();
658 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
659 break;
660 case 'r':
661 if (!isspace((unsigned char)*ibufp)) {
662 sprintf(errmsg, "unexpected command suffix");
663 return ERR;
664 } else if (addr_cnt == 0)
665 second_addr = addr_last;
666 if ((fnp = get_filename()) == NULL)
667 return ERR;
668 GET_COMMAND_SUFFIX();
669 if (!isglobal) clear_undo_stack();
670 if (*old_filename == '\0' && *fnp != '!')
671 strcpy(old_filename, fnp);
672#ifdef BACKWARDS
673 if (*fnp == '\0' && *old_filename == '\0') {
674 sprintf(errmsg, "no current filename");
675 return ERR;
676 }
677#endif
678 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
679 return ERR;
680 else if (addr && addr != addr_last)
681 modified = 1;
682 break;
683 case 's':
684 do {
685 switch(*ibufp) {
686 case '\n':
687 sflags |=SGF;
688 break;
689 case 'g':
690 sflags |= SGG;
691 ibufp++;
692 break;
693 case 'p':
694 sflags |= SGP;
695 ibufp++;
696 break;
697 case 'r':
698 sflags |= SGR;
699 ibufp++;
700 break;
701 case '0': case '1': case '2': case '3': case '4':
702 case '5': case '6': case '7': case '8': case '9':
703 STRTOL(sgnum, ibufp);
704 sflags |= SGF;
705 sgflag &= ~GSG; /* override GSG */
706 break;
707 default:
708 if (sflags) {
709 sprintf(errmsg, "invalid command suffix");
710 return ERR;
711 }
712 }
713 } while (sflags && *ibufp != '\n');
714 if (sflags && !pat) {
715 sprintf(errmsg, "no previous substitution");
716 return ERR;
717 } else if (sflags & SGG)
718 sgnum = 0; /* override numeric arg */
719 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
720 sprintf(errmsg, "invalid pattern delimiter");
721 return ERR;
722 }
723 tpat = pat;
724 SPL1();
725 if ((!sflags || (sflags & SGR)) &&
726 (tpat = get_compiled_pattern()) == NULL) {
727 SPL0();
728 return ERR;
729 } else if (tpat != pat) {
730 if (pat) {
731 regfree(pat);
732 free(pat);
733 }
734 pat = tpat;
735 patlock = 1; /* reserve pattern */
736 }
737 SPL0();
738 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
739 return ERR;
740 else if (isglobal)
741 sgflag |= GLB;
742 else
743 sgflag &= ~GLB;
744 if (sflags & SGG)
745 sgflag ^= GSG;
746 if (sflags & SGP)
747 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
748 do {
749 switch(*ibufp) {
750 case 'p':
751 sgflag |= GPR, ibufp++;
752 break;
753 case 'l':
754 sgflag |= GLS, ibufp++;
755 break;
756 case 'n':
757 sgflag |= GNP, ibufp++;
758 break;
759 default:
760 n++;
761 }
762 } while (!n);
763 if (check_addr_range(current_addr, current_addr) < 0)
764 return ERR;
765 GET_COMMAND_SUFFIX();
766 if (!isglobal) clear_undo_stack();
767 if (search_and_replace(pat, sgflag, sgnum) < 0)
768 return ERR;
769 break;
770 case 't':
771 if (check_addr_range(current_addr, current_addr) < 0)
772 return ERR;
773 GET_THIRD_ADDR(addr);
774 GET_COMMAND_SUFFIX();
775 if (!isglobal) clear_undo_stack();
776 if (copy_lines(addr) < 0)
777 return ERR;
778 break;
779 case 'u':
780 if (addr_cnt > 0) {
781 sprintf(errmsg, "unexpected address");
782 return ERR;
783 }
784 GET_COMMAND_SUFFIX();
785 if (pop_undo_stack() < 0)
786 return ERR;
787 break;
788 case 'w':
789 case 'W':
790 if ((n = *ibufp) == 'q' || n == 'Q') {
791 gflag = EOF;
792 ibufp++;
793 }
794 if (!isspace((unsigned char)*ibufp)) {
795 sprintf(errmsg, "unexpected command suffix");
796 return ERR;
797 } else if ((fnp = get_filename()) == NULL)
798 return ERR;
799 if (addr_cnt == 0 && !addr_last)
800 first_addr = second_addr = 0;
801 else if (check_addr_range(1, addr_last) < 0)
802 return ERR;
803 GET_COMMAND_SUFFIX();
804 if (*old_filename == '\0' && *fnp != '!')
805 strcpy(old_filename, fnp);
806#ifdef BACKWARDS
807 if (*fnp == '\0' && *old_filename == '\0') {
808 sprintf(errmsg, "no current filename");
809 return ERR;
810 }
811#endif
812 if ((addr = write_file(*fnp ? fnp : old_filename,
813 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
814 return ERR;
815 else if (addr == addr_last)
816 modified = 0;
817 else if (modified && !scripted && n == 'q')
818 gflag = EMOD;
819 break;
820 case 'x':
821 if (addr_cnt > 0) {
822 sprintf(errmsg, "unexpected address");
823 return ERR;
824 }
825 GET_COMMAND_SUFFIX();
826#ifdef DES
827 des = get_keyword();
828#else
829 sprintf(errmsg, "crypt unavailable");
830 return ERR;
831#endif
832 break;
833 case 'z':
834#ifdef BACKWARDS
835 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
836#else
837 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
838#endif
839 return ERR;
840 else if ('0' < *ibufp && *ibufp <= '9')
841 STRTOL(rows, ibufp);
842 GET_COMMAND_SUFFIX();
843 if (display_lines(second_addr, min(addr_last,
844 second_addr + rows), gflag) < 0)
845 return ERR;
846 gflag = 0;
847 break;
848 case '=':
849 GET_COMMAND_SUFFIX();
850 printf("%ld\n", addr_cnt ? second_addr : addr_last);
851 break;
852 case '!':
853 if (addr_cnt > 0) {
854 sprintf(errmsg, "unexpected address");
855 return ERR;
856 } else if ((sflags = get_shell_command()) < 0)
857 return ERR;
858 GET_COMMAND_SUFFIX();
859 if (sflags) printf("%s\n", shcmd + 1);
860 system(shcmd + 1);
861 if (!scripted) printf("!\n");
862 break;
863 case '\n':
864#ifdef BACKWARDS
865 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
866#else
867 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
868#endif
869 || display_lines(second_addr, second_addr, 0) < 0)
870 return ERR;
871 break;
872 default:
873 sprintf(errmsg, "unknown command");
874 return ERR;
875 }
876 return gflag;
877}
878
879
880/* check_addr_range: return status of address range check */
881int
882check_addr_range(n, m)
883 long n, m;
884{
885 if (addr_cnt == 0) {
886 first_addr = n;
887 second_addr = m;
888 }
889 if (first_addr > second_addr || 1 > first_addr ||
890 second_addr > addr_last) {
891 sprintf(errmsg, "invalid address");
892 return ERR;
893 }
894 return 0;
895}
896
897
898/* get_matching_node_addr: return the address of the next line matching a
899 pattern in a given direction. wrap around begin/end of editor buffer if
900 necessary */
901long
902get_matching_node_addr(pat, dir)
903 pattern_t *pat;
904 int dir;
905{
906 char *s;
907 long n = current_addr;
908 line_t *lp;
909
910 if (!pat) return ERR;
911 do {
912 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
913 lp = get_addressed_line_node(n);
914 if ((s = get_sbuf_line(lp)) == NULL)
915 return ERR;
916 if (isbinary)
917 NUL_TO_NEWLINE(s, lp->len);
918 if (!regexec(pat, s, 0, NULL, 0))
919 return n;
920 }
921 } while (n != current_addr);
922 sprintf(errmsg, "no match");
923 return ERR;
924}
925
926
927/* get_filename: return pointer to copy of filename in the command buffer */
928char *
929get_filename()
930{
931 static char *file = NULL;
932 static int filesz = 0;
933
934 int n;
935
936 if (*ibufp != '\n') {
937 SKIP_BLANKS();
938 if (*ibufp == '\n') {
939 sprintf(errmsg, "invalid filename");
940 return NULL;
941 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
942 return NULL;
943 else if (*ibufp == '!') {
944 ibufp++;
945 if ((n = get_shell_command()) < 0)
946 return NULL;
947 if (n) printf("%s\n", shcmd + 1);
948 return shcmd;
949 } else if (n - 1 > MAXPATHLEN) {
950 sprintf(errmsg, "filename too long");
951 return NULL;
952 }
953 }
954#ifndef BACKWARDS
955 else if (*old_filename == '\0') {
956 sprintf(errmsg, "no current filename");
957 return NULL;
958 }
959#endif
960 REALLOC(file, filesz, MAXPATHLEN + 1, NULL);
961 for (n = 0; *ibufp != '\n';)
962 file[n++] = *ibufp++;
963 file[n] = '\0';
964 return is_legal_filename(file) ? file : NULL;
965}
966
967
968/* get_shell_command: read a shell command from stdin; return substitution
969 status */
970int
971get_shell_command()
972{
973 static char *buf = NULL;
974 static int n = 0;
975
976 char *s; /* substitution char pointer */
977 int i = 0;
978 int j = 0;
979
980 if (red) {
981 sprintf(errmsg, "shell access restricted");
982 return ERR;
983 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
984 return ERR;
985 REALLOC(buf, n, j + 1, ERR);
986 buf[i++] = '!'; /* prefix command w/ bang */
987 while (*ibufp != '\n')
988 switch (*ibufp) {
989 default:
990 REALLOC(buf, n, i + 2, ERR);
991 buf[i++] = *ibufp;
992 if (*ibufp++ == '\\')
993 buf[i++] = *ibufp++;
994 break;
995 case '!':
996 if (s != ibufp) {
997 REALLOC(buf, n, i + 1, ERR);
998 buf[i++] = *ibufp++;
999 }
1000#ifdef BACKWARDS
1001 else if (shcmd == NULL || *(shcmd + 1) == '\0')
1002#else
1003 else if (shcmd == NULL)
1004#endif
1005 {
1006 sprintf(errmsg, "no previous command");
1007 return ERR;
1008 } else {
1009 REALLOC(buf, n, i + shcmdi, ERR);
1010 for (s = shcmd + 1; s < shcmd + shcmdi;)
1011 buf[i++] = *s++;
1012 s = ibufp++;
1013 }
1014 break;
1015 case '%':
1016 if (*old_filename == '\0') {
1017 sprintf(errmsg, "no current filename");
1018 return ERR;
1019 }
1020 j = strlen(s = strip_escapes(old_filename));
1021 REALLOC(buf, n, i + j, ERR);
1022 while (j--)
1023 buf[i++] = *s++;
1024 s = ibufp++;
1025 break;
1026 }
1027 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1028 memcpy(shcmd, buf, i);
1029 shcmd[shcmdi = i] = '\0';
1030 return *s == '!' || *s == '%';
1031}
1032
1033
1034/* append_lines: insert text from stdin to after line n; stop when either a
1035 single period is read or EOF; return status */
1036int
1037append_lines(n)
1038 long n;
1039{
1040 int l;
1041 char *lp = ibuf;
1042 char *eot;
1043 undo_t *up = NULL;
1044
1045 for (current_addr = n;;) {
1046 if (!isglobal) {
1047 if ((l = get_tty_line()) < 0)
1048 return ERR;
1049 else if (l == 0 || ibuf[l - 1] != '\n') {
1050 clearerr(stdin);
1051 return l ? EOF : 0;
1052 }
1053 lp = ibuf;
1054 } else if (*(lp = ibufp) == '\0')
1055 return 0;
1056 else {
1057 while (*ibufp++ != '\n')
1058 ;
1059 l = ibufp - lp;
1060 }
1061 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1062 return 0;
1063 }
1064 eot = lp + l;
1065 SPL1();
1066 do {
1067 if ((lp = put_sbuf_line(lp)) == NULL) {
1068 SPL0();
1069 return ERR;
1070 } else if (up)
1071 up->t = get_addressed_line_node(current_addr);
1072 else if ((up = push_undo_stack(UADD, current_addr,
1073 current_addr)) == NULL) {
1074 SPL0();
1075 return ERR;
1076 }
1077 } while (lp != eot);
1078 modified = 1;
1079 SPL0();
1080 }
1081 /* NOTREACHED */
1082}
1083
1084
1085/* join_lines: replace a range of lines with the joined text of those lines */
1086int
1087join_lines(from, to)
1088 long from;
1089 long to;
1090{
1091 static char *buf = NULL;
1092 static int n;
1093
1094 char *s;
1095 int size = 0;
1096 line_t *bp, *ep;
1097
1098 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1099 bp = get_addressed_line_node(from);
1100 for (; bp != ep; bp = bp->q_forw) {
1101 if ((s = get_sbuf_line(bp)) == NULL)
1102 return ERR;
1103 REALLOC(buf, n, size + bp->len, ERR);
1104 memcpy(buf + size, s, bp->len);
1105 size += bp->len;
1106 }
1107 REALLOC(buf, n, size + 2, ERR);
1108 memcpy(buf + size, "\n", 2);
1109 if (delete_lines(from, to) < 0)
1110 return ERR;
1111 current_addr = from - 1;
1112 SPL1();
1113 if (put_sbuf_line(buf) == NULL ||
1114 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1115 SPL0();
1116 return ERR;
1117 }
1118 modified = 1;
1119 SPL0();
1120 return 0;
1121}
1122
1123
1124/* move_lines: move a range of lines */
1125int
1126move_lines(addr)
1127 long addr;
1128{
1129 line_t *b1, *a1, *b2, *a2;
1130 long n = INC_MOD(second_addr, addr_last);
1131 long p = first_addr - 1;
1132 int done = (addr == first_addr - 1 || addr == second_addr);
1133
1134 SPL1();
1135 if (done) {
1136 a2 = get_addressed_line_node(n);
1137 b2 = get_addressed_line_node(p);
1138 current_addr = second_addr;
1139 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1140 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1141 SPL0();
1142 return ERR;
1143 } else {
1144 a1 = get_addressed_line_node(n);
1145 if (addr < first_addr) {
1146 b1 = get_addressed_line_node(p);
1147 b2 = get_addressed_line_node(addr);
1148 /* this get_addressed_line_node last! */
1149 } else {
1150 b2 = get_addressed_line_node(addr);
1151 b1 = get_addressed_line_node(p);
1152 /* this get_addressed_line_node last! */
1153 }
1154 a2 = b2->q_forw;
1155 REQUE(b2, b1->q_forw);
1156 REQUE(a1->q_back, a2);
1157 REQUE(b1, a1);
1158 current_addr = addr + ((addr < first_addr) ?
1159 second_addr - first_addr + 1 : 0);
1160 }
1161 if (isglobal)
1162 unset_active_nodes(b2->q_forw, a2);
1163 modified = 1;
1164 SPL0();
1165 return 0;
1166}
1167
1168
1169/* copy_lines: copy a range of lines; return status */
1170int
1171copy_lines(addr)
1172 long addr;
1173{
1174 line_t *lp, *np = get_addressed_line_node(first_addr);
1175 undo_t *up = NULL;
1176 long n = second_addr - first_addr + 1;
1177 long m = 0;
1178
1179 current_addr = addr;
1180 if (first_addr <= addr && addr < second_addr) {
1181 n = addr - first_addr + 1;
1182 m = second_addr - addr;
1183 }
1184 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1185 for (; n-- > 0; np = np->q_forw) {
1186 SPL1();
1187 if ((lp = dup_line_node(np)) == NULL) {
1188 SPL0();
1189 return ERR;
1190 }
1191 add_line_node(lp);
1192 if (up)
1193 up->t = lp;
1194 else if ((up = push_undo_stack(UADD, current_addr,
1195 current_addr)) == NULL) {
1196 SPL0();
1197 return ERR;
1198 }
1199 modified = 1;
1200 SPL0();
1201 }
1202 return 0;
1203}
1204
1205
1206/* delete_lines: delete a range of lines */
1207int
1208delete_lines(from, to)
1209 long from, to;
1210{
1211 line_t *n, *p;
1212
1213 SPL1();
1214 if (push_undo_stack(UDEL, from, to) == NULL) {
1215 SPL0();
1216 return ERR;
1217 }
1218 n = get_addressed_line_node(INC_MOD(to, addr_last));
1219 p = get_addressed_line_node(from - 1);
1220 /* this get_addressed_line_node last! */
1221 if (isglobal)
1222 unset_active_nodes(p->q_forw, n);
1223 REQUE(p, n);
1224 addr_last -= to - from + 1;
1225 current_addr = from - 1;
1226 modified = 1;
1227 SPL0();
1228 return 0;
1229}
1230
1231
1232/* display_lines: print a range of lines to stdout */
1233int
1234display_lines(from, to, gflag)
1235 long from;
1236 long to;
1237 int gflag;
1238{
1239 line_t *bp;
1240 line_t *ep;
1241 char *s;
1242
1243 if (!from) {
1244 sprintf(errmsg, "invalid address");
1245 return ERR;
1246 }
1247 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1248 bp = get_addressed_line_node(from);
1249 for (; bp != ep; bp = bp->q_forw) {
1250 if ((s = get_sbuf_line(bp)) == NULL)
1251 return ERR;
1252 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1253 return ERR;
1254 }
1255 return 0;
1256}
1257
1258
1259#define MAXMARK 26 /* max number of marks */
1260
1261line_t *mark[MAXMARK]; /* line markers */
1262int markno; /* line marker count */
1263
1264/* mark_line_node: set a line node mark */
1265int
1266mark_line_node(lp, n)
1267 line_t *lp;
1268 int n;
1269{
1270 if (!islower((unsigned char)n)) {
1271 sprintf(errmsg, "invalid mark character");
1272 return ERR;
1273 } else if (mark[n - 'a'] == NULL)
1274 markno++;
1275 mark[n - 'a'] = lp;
1276 return 0;
1277}
1278
1279
1280/* get_marked_node_addr: return address of a marked line */
1281long
1282get_marked_node_addr(n)
1283 int n;
1284{
1285 if (!islower((unsigned char)n)) {
1286 sprintf(errmsg, "invalid mark character");
1287 return ERR;
1288 }
1289 return get_line_node_addr(mark[n - 'a']);
1290}
1291
1292
1293/* unmark_line_node: clear line node mark */
1294void
1295unmark_line_node(lp)
1296 line_t *lp;
1297{
1298 int i;
1299
1300 for (i = 0; markno && i < MAXMARK; i++)
1301 if (mark[i] == lp) {
1302 mark[i] = NULL;
1303 markno--;
1304 }
1305}
1306
1307
1308/* dup_line_node: return a pointer to a copy of a line node */
1309line_t *
1310dup_line_node(lp)
1311 line_t *lp;
1312{
1313 line_t *np;
1314
1315 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1316 fprintf(stderr, "%s\n", strerror(errno));
1317 sprintf(errmsg, "out of memory");
1318 return NULL;
1319 }
1320 np->seek = lp->seek;
1321 np->len = lp->len;
1322 return np;
1323}
1324
1325
1326/* has_trailing_escape: return the parity of escapes preceding a character
1327 in a string */
1328int
1329has_trailing_escape(s, t)
1330 char *s;
1331 char *t;
1332{
1333 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1334}
1335
1336
1337/* strip_escapes: return copy of escaped string of at most length MAXPATHLEN */
1338char *
1339strip_escapes(s)
1340 char *s;
1341{
1342 static char *file = NULL;
1343 static int filesz = 0;
1344
1345 int i = 0;
1346
1347 REALLOC(file, filesz, MAXPATHLEN + 1, NULL);
1348 /* assert: no trailing escape */
1349 while ((file[i++] = (*s == '\\') ? *++s : *s))
1350 s++;
1351 return file;
1352}
1353
1354
1355void
1356signal_hup(signo)
1357 int signo;
1358{
1359 if (mutex)
1360 sigflags |= (1 << (signo - 1));
1361 else
1362 handle_hup(signo);
1363}
1364
1365
1366void
1367signal_int(signo)
1368 int signo;
1369{
1370 if (mutex)
1371 sigflags |= (1 << (signo - 1));
1372 else
1373 handle_int(signo);
1374}
1375
1376
1377void
1378handle_hup(signo)
1379 int signo;
1380{
1381 char *hup = NULL; /* hup filename */
1382 char *s;
1383 int n;
1384
1385 if (!sigactive)
1386 quit(1);
1387 sigflags &= ~(1 << (signo - 1));
1388 if (addr_last && write_file("ed.hup", "w", 1, addr_last) < 0 &&
1389 (s = getenv("HOME")) != NULL &&
1390 (n = strlen(s)) + 8 <= MAXPATHLEN && /* "ed.hup" + '/' */
1391 (hup = (char *) malloc(n + 10)) != NULL) {
1392 strcpy(hup, s);
1393 if (hup[n - 1] != '/')
1394 hup[n] = '/', hup[n+1] = '\0';
1395 strcat(hup, "ed.hup");
1396 write_file(hup, "w", 1, addr_last);
1397 }
1398 quit(2);
1399}
1400
1401
1402void
1403handle_int(signo)
1404 int signo;
1405{
1406 if (!sigactive)
1407 quit(1);
1408 sigflags &= ~(1 << (signo - 1));
1409#ifdef _POSIX_SOURCE
1410 siglongjmp(env, -1);
1411#else
1412 longjmp(env, -1);
1413#endif
1414}
1415
1416
1417int cols = 72; /* wrap column */
1418
1419void
1420handle_winch(signo)
1421 int signo;
1422{
1423 int save_errno = errno;
1424
1425 struct winsize ws; /* window size structure */
1426
1427 sigflags &= ~(1 << (signo - 1));
1428 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1429 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1430 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1431 }
1432 errno = save_errno;
1433}
1434
1435
1436/* is_legal_filename: return a legal filename */
1437int
1438is_legal_filename(s)
1439 char *s;
1440{
1441 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1442 sprintf(errmsg, "shell access restricted");
1443 return 0;
1444 }
1445 return 1;
1446}
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