1 /* main.c: This file contains the main control and user-interface routines
2 for the ed line editor. */
4 * Copyright (c) 1993 Andrew Moore, Talke Studio.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * @(#) Copyright (c) 1993 Andrew Moore, Talke Studio. All rights reserved.
29 * @(#)main.c,v 1.1 1994/02/01 00:34:42 alm Exp
30 * $FreeBSD: head/bin/ed/main.c 292455 2015-12-18 23:05:36Z pfg $
36 * This program is based on the editor algorithm described in
37 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
38 * in Pascal," Addison-Wesley, 1981.
40 * The buffering algorithm is attributed to Rodney Ruddock of
41 * the University of Guelph, Guelph, Ontario.
43 * The cbc.c encryption code is adapted from
44 * the bdes program by Matt Bishop of Dartmouth College,
49 #include <sys/types.h>
51 #include <sys/ioctl.h>
61 static sigjmp_buf env;
64 char stdinbuf[1]; /* stdin buffer */
65 static char *shcmd; /* shell command buffer */
66 static int shcmdsz; /* shell command buffer size */
67 static int shcmdi; /* shell command buffer index */
68 char *ibuf; /* ed command-line buffer */
69 int ibufsz; /* ed command-line buffer size */
70 char *ibufp; /* pointer to ed command-line buffer */
73 int des = 0; /* if set, use crypt(3) for i/o */
74 static int garrulous = 0; /* if set, print all error messages */
75 int isbinary; /* if set, buffer contains ASCII NULs */
76 int isglobal; /* if set, doing a global command */
77 int modified; /* if set, buffer modified since last write */
78 int mutex = 0; /* if set, signals set "sigflags" */
79 static int red = 0; /* if set, restrict shell/directory access */
80 int scripted = 0; /* if set, suppress diagnostics */
81 int sigflags = 0; /* if set, signals received while mutex set */
82 static int sigactive = 0; /* if set, signal handlers are enabled */
84 static char old_filename[PATH_MAX] = ""; /* default filename */
85 long current_addr; /* current address in editor buffer */
86 long addr_last; /* last address in editor buffer */
87 int lineno; /* script line number */
88 static const char *prompt; /* command-line prompt */
89 static const char *dps = "*"; /* default command-line prompt */
91 static const char *usage = "usage: %s [-] [-sx] [-p string] [file]\n";
95 main(volatile int argc, char ** volatile argv)
100 setlocale(LC_ALL, "");
102 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
104 while ((c = getopt(argc, argv, "p:sx")) != -1)
106 case 'p': /* set prompt */
109 case 's': /* run script */
112 case 'x': /* use crypt */
116 fprintf(stderr, "crypt unavailable\n?\n");
121 fprintf(stderr, usage, red ? "red" : "ed");
126 if (argc && **argv == '-') {
135 /* assert: reliable signals! */
137 handle_winch(SIGWINCH);
138 if (isatty(0)) signal(SIGWINCH, handle_winch);
140 signal(SIGHUP, signal_hup);
141 signal(SIGQUIT, SIG_IGN);
142 signal(SIGINT, signal_int);
143 if ((status = sigsetjmp(env, 1))) {
144 fputs("\n?\n", stderr);
145 errmsg = "interrupt";
148 sigactive = 1; /* enable signal handlers */
149 if (argc && **argv && is_legal_filename(*argv)) {
150 if (read_file(*argv, 0) < 0 && !isatty(0))
152 else if (**argv != '!')
153 if (strlcpy(old_filename, *argv, sizeof(old_filename))
154 >= sizeof(old_filename))
157 fputs("?\n", stderr);
159 errmsg = "invalid filename";
165 if (status < 0 && garrulous)
166 fprintf(stderr, "%s\n", errmsg);
168 printf("%s", prompt);
171 if ((n = get_tty_line()) < 0) {
175 if (modified && !scripted) {
176 fputs("?\n", stderr);
177 errmsg = "warning: file modified";
181 "script, line %d: %s\n",
191 } else if (ibuf[n - 1] != '\n') {
193 errmsg = "unexpected end-of-file";
199 if ((status = extract_addr_range()) >= 0 &&
200 (status = exec_command()) >= 0)
202 (status = display_lines(current_addr, current_addr,
210 fputs("?\n", stderr); /* give warning */
211 errmsg = "warning: file modified";
214 fprintf(stderr, "script, line %d: %s\n",
222 fprintf(stderr, "script, line %d: %s\n",
224 } else if (garrulous)
225 fprintf(stderr, "%s\n", errmsg);
228 fputs("?\n", stderr);
231 fprintf(stderr, "script, line %d: %s\n",
241 long first_addr, second_addr;
242 static long addr_cnt;
244 /* extract_addr_range: get line addresses from the command buffer until an
245 illegal address is seen; return status */
247 extract_addr_range(void)
252 first_addr = second_addr = current_addr;
253 while ((addr = next_addr()) >= 0) {
255 first_addr = second_addr;
257 if (*ibufp != ',' && *ibufp != ';')
259 else if (*ibufp++ == ';')
262 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
263 first_addr = second_addr;
264 return (addr == ERR) ? ERR : 0;
268 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
270 #define MUST_BE_FIRST() do { \
272 errmsg = "invalid address"; \
277 /* next_addr: return the next line address in the command buffer */
282 long addr = current_addr;
288 for (hd = ibufp;; first = 0)
289 switch (c = *ibufp) {
297 if (isdigit((unsigned char)*ibufp)) {
299 addr += (c == '-' || c == '^') ? -n : n;
300 } else if (!isspace((unsigned char)c))
301 addr += (c == '-' || c == '^') ? -1 : 1;
303 case '0': case '1': case '2':
304 case '3': case '4': case '5':
305 case '6': case '7': case '8': case '9':
313 addr = (c == '.') ? current_addr : addr_last;
318 if ((addr = get_matching_node_addr(
319 get_compiled_pattern(), c == '/')) < 0)
321 else if (c == *ibufp)
327 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
336 second_addr = (c == ';') ? current_addr : 1;
344 else if (addr < 0 || addr_last < addr) {
345 errmsg = "invalid address";
355 /* GET_THIRD_ADDR: get a legal address from the command buffer */
356 #define GET_THIRD_ADDR(addr) \
360 ol1 = first_addr, ol2 = second_addr; \
361 if (extract_addr_range() < 0) \
363 else if (addr_cnt == 0) { \
364 errmsg = "destination expected"; \
366 } else if (second_addr < 0 || addr_last < second_addr) { \
367 errmsg = "invalid address"; \
370 addr = second_addr; \
371 first_addr = ol1, second_addr = ol2; \
373 #else /* BACKWARDS */
374 /* GET_THIRD_ADDR: get a legal address from the command buffer */
375 #define GET_THIRD_ADDR(addr) \
379 ol1 = first_addr, ol2 = second_addr; \
380 if (extract_addr_range() < 0) \
382 if (second_addr < 0 || addr_last < second_addr) { \
383 errmsg = "invalid address"; \
386 addr = second_addr; \
387 first_addr = ol1, second_addr = ol2; \
392 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
393 #define GET_COMMAND_SUFFIX() { \
398 gflag |= GPR, ibufp++; \
401 gflag |= GLS, ibufp++; \
404 gflag |= GNP, ibufp++; \
410 if (*ibufp++ != '\n') { \
411 errmsg = "invalid command suffix"; \
418 #define SGG 001 /* complement previous global substitute suffix */
419 #define SGP 002 /* complement previous print suffix */
420 #define SGR 004 /* use last regex instead of last pat */
421 #define SGF 010 /* repeat last substitution */
423 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
425 long rows = 22; /* scroll length: ws_row - 2 */
427 /* exec_command: execute the next command in command buffer; return print
432 static pattern_t *pat = NULL;
433 static int sgflag = 0;
434 static long sgnum = 0;
445 switch(c = *ibufp++) {
447 GET_COMMAND_SUFFIX();
448 if (!isglobal) clear_undo_stack();
449 if (append_lines(second_addr) < 0)
453 if (check_addr_range(current_addr, current_addr) < 0)
455 GET_COMMAND_SUFFIX();
456 if (!isglobal) clear_undo_stack();
457 if (delete_lines(first_addr, second_addr) < 0 ||
458 append_lines(current_addr) < 0)
462 if (check_addr_range(current_addr, current_addr) < 0)
464 GET_COMMAND_SUFFIX();
465 if (!isglobal) clear_undo_stack();
466 if (delete_lines(first_addr, second_addr) < 0)
468 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
472 if (modified && !scripted)
477 errmsg = "unexpected address";
479 } else if (!isspace((unsigned char)*ibufp)) {
480 errmsg = "unexpected command suffix";
482 } else if ((fnp = get_filename()) == NULL)
484 GET_COMMAND_SUFFIX();
485 if (delete_lines(1, addr_last) < 0)
488 if (close_sbuf() < 0)
490 else if (open_sbuf() < 0)
492 if (*fnp && *fnp != '!')
493 strlcpy(old_filename, fnp, PATH_MAX);
495 if (*fnp == '\0' && *old_filename == '\0') {
496 errmsg = "no current filename";
500 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
504 u_current_addr = u_addr_last = -1;
508 errmsg = "unexpected address";
510 } else if (!isspace((unsigned char)*ibufp)) {
511 errmsg = "unexpected command suffix";
513 } else if ((fnp = get_filename()) == NULL)
515 else if (*fnp == '!') {
516 errmsg = "invalid redirection";
519 GET_COMMAND_SUFFIX();
521 strlcpy(old_filename, fnp, PATH_MAX);
522 printf("%s\n", strip_escapes(old_filename));
529 errmsg = "cannot nest global commands";
531 } else if (check_addr_range(1, addr_last) < 0)
533 else if (build_active_list(c == 'g' || c == 'G') < 0)
535 else if ((n = (c == 'G' || c == 'V')))
536 GET_COMMAND_SUFFIX();
538 if (exec_global(n, gflag) < 0)
543 errmsg = "unexpected address";
546 GET_COMMAND_SUFFIX();
547 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
551 errmsg = "unexpected address";
554 GET_COMMAND_SUFFIX();
555 if ((garrulous = 1 - garrulous) && *errmsg)
556 fprintf(stderr, "%s\n", errmsg);
559 if (second_addr == 0) {
560 errmsg = "invalid address";
563 GET_COMMAND_SUFFIX();
564 if (!isglobal) clear_undo_stack();
565 if (append_lines(second_addr - 1) < 0)
569 if (check_addr_range(current_addr, current_addr + 1) < 0)
571 GET_COMMAND_SUFFIX();
572 if (!isglobal) clear_undo_stack();
573 if (first_addr != second_addr &&
574 join_lines(first_addr, second_addr) < 0)
579 if (second_addr == 0) {
580 errmsg = "invalid address";
583 GET_COMMAND_SUFFIX();
584 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
588 if (check_addr_range(current_addr, current_addr) < 0)
590 GET_COMMAND_SUFFIX();
591 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
596 if (check_addr_range(current_addr, current_addr) < 0)
598 GET_THIRD_ADDR(addr);
599 if (first_addr <= addr && addr < second_addr) {
600 errmsg = "invalid destination";
603 GET_COMMAND_SUFFIX();
604 if (!isglobal) clear_undo_stack();
605 if (move_lines(addr) < 0)
609 if (check_addr_range(current_addr, current_addr) < 0)
611 GET_COMMAND_SUFFIX();
612 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
617 if (check_addr_range(current_addr, current_addr) < 0)
619 GET_COMMAND_SUFFIX();
620 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
626 errmsg = "unexpected address";
629 GET_COMMAND_SUFFIX();
630 prompt = prompt ? NULL : optarg ? optarg : dps;
635 errmsg = "unexpected address";
638 GET_COMMAND_SUFFIX();
639 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
642 if (!isspace((unsigned char)*ibufp)) {
643 errmsg = "unexpected command suffix";
645 } else if (addr_cnt == 0)
646 second_addr = addr_last;
647 if ((fnp = get_filename()) == NULL)
649 GET_COMMAND_SUFFIX();
650 if (!isglobal) clear_undo_stack();
651 if (*old_filename == '\0' && *fnp != '!')
652 strlcpy(old_filename, fnp, PATH_MAX);
654 if (*fnp == '\0' && *old_filename == '\0') {
655 errmsg = "no current filename";
659 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
661 else if (addr && addr != addr_last)
682 case '0': case '1': case '2': case '3': case '4':
683 case '5': case '6': case '7': case '8': case '9':
684 STRTOL(sgnum, ibufp);
686 sgflag &= ~GSG; /* override GSG */
690 errmsg = "invalid command suffix";
694 } while (sflags && *ibufp != '\n');
695 if (sflags && !pat) {
696 errmsg = "no previous substitution";
698 } else if (sflags & SGG)
699 sgnum = 0; /* override numeric arg */
700 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
701 errmsg = "invalid pattern delimiter";
706 if ((!sflags || (sflags & SGR)) &&
707 (tpat = get_compiled_pattern()) == NULL) {
710 } else if (tpat != pat) {
716 patlock = 1; /* reserve pattern */
719 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
728 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
732 sgflag |= GPR, ibufp++;
735 sgflag |= GLS, ibufp++;
738 sgflag |= GNP, ibufp++;
744 if (check_addr_range(current_addr, current_addr) < 0)
746 GET_COMMAND_SUFFIX();
747 if (!isglobal) clear_undo_stack();
748 if (search_and_replace(pat, sgflag, sgnum) < 0)
752 if (check_addr_range(current_addr, current_addr) < 0)
754 GET_THIRD_ADDR(addr);
755 GET_COMMAND_SUFFIX();
756 if (!isglobal) clear_undo_stack();
757 if (copy_lines(addr) < 0)
762 errmsg = "unexpected address";
765 GET_COMMAND_SUFFIX();
766 if (pop_undo_stack() < 0)
771 if ((n = *ibufp) == 'q' || n == 'Q') {
775 if (!isspace((unsigned char)*ibufp)) {
776 errmsg = "unexpected command suffix";
778 } else if ((fnp = get_filename()) == NULL)
780 if (addr_cnt == 0 && !addr_last)
781 first_addr = second_addr = 0;
782 else if (check_addr_range(1, addr_last) < 0)
784 GET_COMMAND_SUFFIX();
785 if (*old_filename == '\0' && *fnp != '!')
786 strlcpy(old_filename, fnp, PATH_MAX);
788 if (*fnp == '\0' && *old_filename == '\0') {
789 errmsg = "no current filename";
793 if ((addr = write_file(*fnp ? fnp : old_filename,
794 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
796 else if (addr == addr_last)
798 else if (modified && !scripted && n == 'q')
803 errmsg = "unexpected address";
806 GET_COMMAND_SUFFIX();
811 errmsg = "crypt unavailable";
816 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
818 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
821 else if ('0' < *ibufp && *ibufp <= '9')
823 GET_COMMAND_SUFFIX();
824 if (display_lines(second_addr, min(addr_last,
825 second_addr + rows), gflag) < 0)
830 GET_COMMAND_SUFFIX();
831 printf("%ld\n", addr_cnt ? second_addr : addr_last);
835 errmsg = "unexpected address";
837 } else if ((sflags = get_shell_command()) < 0)
839 GET_COMMAND_SUFFIX();
840 if (sflags) printf("%s\n", shcmd + 1);
842 if (!scripted) printf("!\n");
846 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
848 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
850 || display_lines(second_addr, second_addr, 0) < 0)
854 errmsg = "unknown command";
861 /* check_addr_range: return status of address range check */
863 check_addr_range(long n, long m)
869 if (first_addr > second_addr || 1 > first_addr ||
870 second_addr > addr_last) {
871 errmsg = "invalid address";
878 /* get_matching_node_addr: return the address of the next line matching a
879 pattern in a given direction. wrap around begin/end of editor buffer if
882 get_matching_node_addr(pattern_t *pat, int dir)
885 long n = current_addr;
888 if (!pat) return ERR;
890 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
891 lp = get_addressed_line_node(n);
892 if ((s = get_sbuf_line(lp)) == NULL)
895 NUL_TO_NEWLINE(s, lp->len);
896 if (!regexec(pat, s, 0, NULL, 0))
899 } while (n != current_addr);
905 /* get_filename: return pointer to copy of filename in the command buffer */
909 static char *file = NULL;
910 static int filesz = 0;
914 if (*ibufp != '\n') {
916 if (*ibufp == '\n') {
917 errmsg = "invalid filename";
919 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
921 else if (*ibufp == '!') {
923 if ((n = get_shell_command()) < 0)
926 printf("%s\n", shcmd + 1);
928 } else if (n > PATH_MAX - 1) {
929 errmsg = "filename too long";
934 else if (*old_filename == '\0') {
935 errmsg = "no current filename";
939 REALLOC(file, filesz, PATH_MAX, NULL);
940 for (n = 0; *ibufp != '\n';)
941 file[n++] = *ibufp++;
943 return is_legal_filename(file) ? file : NULL;
947 /* get_shell_command: read a shell command from stdin; return substitution
950 get_shell_command(void)
952 static char *buf = NULL;
955 char *s; /* substitution char pointer */
960 errmsg = "shell access restricted";
962 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
964 REALLOC(buf, n, j + 1, ERR);
965 buf[i++] = '!'; /* prefix command w/ bang */
966 while (*ibufp != '\n')
969 REALLOC(buf, n, i + 2, ERR);
971 if (*ibufp++ == '\\')
976 REALLOC(buf, n, i + 1, ERR);
980 else if (shcmd == NULL || *(shcmd + 1) == '\0')
982 else if (shcmd == NULL)
985 errmsg = "no previous command";
988 REALLOC(buf, n, i + shcmdi, ERR);
989 for (s = shcmd + 1; s < shcmd + shcmdi;)
995 if (*old_filename == '\0') {
996 errmsg = "no current filename";
999 j = strlen(s = strip_escapes(old_filename));
1000 REALLOC(buf, n, i + j, ERR);
1006 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1007 memcpy(shcmd, buf, i);
1008 shcmd[shcmdi = i] = '\0';
1009 return *s == '!' || *s == '%';
1013 /* append_lines: insert text from stdin to after line n; stop when either a
1014 single period is read or EOF; return status */
1016 append_lines(long n)
1019 const char *lp = ibuf;
1023 for (current_addr = n;;) {
1025 if ((l = get_tty_line()) < 0)
1027 else if (l == 0 || ibuf[l - 1] != '\n') {
1032 } else if (*(lp = ibufp) == '\0')
1035 while (*ibufp++ != '\n')
1039 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1045 if ((lp = put_sbuf_line(lp)) == NULL) {
1049 up->t = get_addressed_line_node(current_addr);
1050 else if ((up = push_undo_stack(UADD, current_addr,
1051 current_addr)) == NULL) {
1055 } while (lp != eot);
1063 /* join_lines: replace a range of lines with the joined text of those lines */
1065 join_lines(long from, long to)
1067 static char *buf = NULL;
1074 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1075 bp = get_addressed_line_node(from);
1076 for (; bp != ep; bp = bp->q_forw) {
1077 if ((s = get_sbuf_line(bp)) == NULL)
1079 REALLOC(buf, n, size + bp->len, ERR);
1080 memcpy(buf + size, s, bp->len);
1083 REALLOC(buf, n, size + 2, ERR);
1084 memcpy(buf + size, "\n", 2);
1085 if (delete_lines(from, to) < 0)
1087 current_addr = from - 1;
1089 if (put_sbuf_line(buf) == NULL ||
1090 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1100 /* move_lines: move a range of lines */
1102 move_lines(long addr)
1104 line_t *b1, *a1, *b2, *a2;
1105 long n = INC_MOD(second_addr, addr_last);
1106 long p = first_addr - 1;
1107 int done = (addr == first_addr - 1 || addr == second_addr);
1111 a2 = get_addressed_line_node(n);
1112 b2 = get_addressed_line_node(p);
1113 current_addr = second_addr;
1114 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1115 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1119 a1 = get_addressed_line_node(n);
1120 if (addr < first_addr) {
1121 b1 = get_addressed_line_node(p);
1122 b2 = get_addressed_line_node(addr);
1123 /* this get_addressed_line_node last! */
1125 b2 = get_addressed_line_node(addr);
1126 b1 = get_addressed_line_node(p);
1127 /* this get_addressed_line_node last! */
1130 REQUE(b2, b1->q_forw);
1131 REQUE(a1->q_back, a2);
1133 current_addr = addr + ((addr < first_addr) ?
1134 second_addr - first_addr + 1 : 0);
1137 unset_active_nodes(b2->q_forw, a2);
1144 /* copy_lines: copy a range of lines; return status */
1146 copy_lines(long addr)
1148 line_t *lp, *np = get_addressed_line_node(first_addr);
1150 long n = second_addr - first_addr + 1;
1153 current_addr = addr;
1154 if (first_addr <= addr && addr < second_addr) {
1155 n = addr - first_addr + 1;
1156 m = second_addr - addr;
1158 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1159 for (; n-- > 0; np = np->q_forw) {
1161 if ((lp = dup_line_node(np)) == NULL) {
1168 else if ((up = push_undo_stack(UADD, current_addr,
1169 current_addr)) == NULL) {
1180 /* delete_lines: delete a range of lines */
1182 delete_lines(long from, long to)
1187 if (push_undo_stack(UDEL, from, to) == NULL) {
1191 n = get_addressed_line_node(INC_MOD(to, addr_last));
1192 p = get_addressed_line_node(from - 1);
1193 /* this get_addressed_line_node last! */
1195 unset_active_nodes(p->q_forw, n);
1197 addr_last -= to - from + 1;
1198 current_addr = from - 1;
1205 /* display_lines: print a range of lines to stdout */
1207 display_lines(long from, long to, int gflag)
1214 errmsg = "invalid address";
1217 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1218 bp = get_addressed_line_node(from);
1219 for (; bp != ep; bp = bp->q_forw) {
1220 if ((s = get_sbuf_line(bp)) == NULL)
1222 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1229 #define MAXMARK 26 /* max number of marks */
1231 static line_t *mark[MAXMARK]; /* line markers */
1232 static int markno; /* line marker count */
1234 /* mark_line_node: set a line node mark */
1236 mark_line_node(line_t *lp, int n)
1238 if (!islower((unsigned char)n)) {
1239 errmsg = "invalid mark character";
1241 } else if (mark[n - 'a'] == NULL)
1248 /* get_marked_node_addr: return address of a marked line */
1250 get_marked_node_addr(int n)
1252 if (!islower((unsigned char)n)) {
1253 errmsg = "invalid mark character";
1256 return get_line_node_addr(mark[n - 'a']);
1260 /* unmark_line_node: clear line node mark */
1262 unmark_line_node(line_t *lp)
1266 for (i = 0; markno && i < MAXMARK; i++)
1267 if (mark[i] == lp) {
1274 /* dup_line_node: return a pointer to a copy of a line node */
1276 dup_line_node(line_t *lp)
1280 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1281 fprintf(stderr, "%s\n", strerror(errno));
1282 errmsg = "out of memory";
1285 np->seek = lp->seek;
1291 /* has_trailing_escape: return the parity of escapes preceding a character
1294 has_trailing_escape(char *s, char *t)
1296 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1300 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1302 strip_escapes(char *s)
1304 static char *file = NULL;
1305 static int filesz = 0;
1309 REALLOC(file, filesz, PATH_MAX, NULL);
1310 while (i < filesz - 1 /* Worry about a possible trailing escape */
1311 && (file[i++] = (*s == '\\') ? *++s : *s))
1318 signal_hup(int signo)
1321 sigflags |= (1 << (signo - 1));
1328 signal_int(int signo)
1331 sigflags |= (1 << (signo - 1));
1338 handle_hup(int signo)
1340 char *hup = NULL; /* hup filename */
1342 char ed_hup[] = "ed.hup";
1347 sigflags &= ~(1 << (signo - 1));
1348 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
1349 (s = getenv("HOME")) != NULL &&
1350 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1351 (hup = (char *) malloc(n + 10)) != NULL) {
1353 if (hup[n - 1] != '/')
1354 hup[n] = '/', hup[n+1] = '\0';
1355 strcat(hup, "ed.hup");
1356 write_file(hup, "w", 1, addr_last);
1363 handle_int(int signo)
1367 sigflags &= ~(1 << (signo - 1));
1368 siglongjmp(env, -1);
1372 int cols = 72; /* wrap column */
1375 handle_winch(int signo)
1377 int save_errno = errno;
1379 struct winsize ws; /* window size structure */
1381 sigflags &= ~(1 << (signo - 1));
1382 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1383 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1384 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1390 /* is_legal_filename: return a legal filename */
1392 is_legal_filename(char *s)
1394 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1395 errmsg = "shell access restricted";