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