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: src/bin/ed/main.c,v 1.29 2006/08/17 23:00:33 imp Exp $
31 * $DragonFly: src/bin/ed/main.c,v 1.9 2007/04/06 23:36:54 pavalos Exp $
37 * This program is based on the editor algorithm described in
38 * Brian W. Kernighan and P. J. Plauger's book "Software Tools
39 * in Pascal," Addison-Wesley, 1981.
41 * The buffering algorithm is attributed to Rodney Ruddock of
42 * the University of Guelph, Guelph, Ontario.
44 * The cbc.c encryption code is adapted from
45 * the bdes program by Matt Bishop of Dartmouth College,
50 #include <sys/types.h>
52 #include <sys/ioctl.h>
69 char stdinbuf[1]; /* stdin buffer */
70 char *shcmd; /* shell command buffer */
71 int shcmdsz; /* shell command buffer size */
72 int shcmdi; /* shell command buffer index */
73 char *ibuf; /* ed command-line buffer */
74 int ibufsz; /* ed command-line buffer size */
75 char *ibufp; /* pointer to ed command-line buffer */
78 int des = 0; /* if set, use crypt(3) for i/o */
79 int garrulous = 0; /* if set, print all error messages */
80 int isbinary; /* if set, buffer contains ASCII NULs */
81 int isglobal; /* if set, doing a global command */
82 int modified; /* if set, buffer modified since last write */
83 int mutex = 0; /* if set, signals set "sigflags" */
84 int red = 0; /* if set, restrict shell/directory access */
85 int scripted = 0; /* if set, suppress diagnostics */
86 int sigflags = 0; /* if set, signals received while mutex set */
87 int sigactive = 0; /* if set, signal handlers are enabled */
89 char old_filename[PATH_MAX] = ""; /* default filename */
90 long current_addr; /* current address in editor buffer */
91 long addr_last; /* last address in editor buffer */
92 int lineno; /* script line number */
93 const char *prompt; /* command-line prompt */
94 const char *dps = "*"; /* default command-line prompt */
96 const char usage[] = "usage: %s [-] [-sx] [-p string] [file]\n";
100 main(int argc, char *argv[])
105 /* Avoid longjmp clobbering */
110 setlocale(LC_ALL, "");
112 red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
114 while ((c = getopt(argc, argv, "p:sx")) != -1)
116 case 'p': /* set prompt */
119 case 's': /* run script */
122 case 'x': /* use crypt */
126 fprintf(stderr, "crypt unavailable\n?\n");
131 fprintf(stderr, usage, red ? "red" : "ed");
136 if (argc && **argv == '-') {
145 /* assert: reliable signals! */
147 handle_winch(SIGWINCH);
148 if (isatty(0)) signal(SIGWINCH, handle_winch);
150 signal(SIGHUP, signal_hup);
151 signal(SIGQUIT, SIG_IGN);
152 signal(SIGINT, signal_int);
154 if ((status = sigsetjmp(env, 1)))
156 if ((status = setjmp(env)))
159 fputs("\n?\n", stderr);
160 errmsg = "interrupt";
163 sigactive = 1; /* enable signal handlers */
164 if (argc && **argv && is_legal_filename(*argv)) {
165 if (read_file(*argv, 0) < 0 && !isatty(0))
167 else if (**argv != '!')
168 if (strlcpy(old_filename, *argv, sizeof(old_filename))
169 >= sizeof(old_filename))
172 fputs("?\n", stderr);
174 errmsg = "invalid filename";
180 if (status < 0 && garrulous)
181 fprintf(stderr, "%s\n", errmsg);
183 printf("%s", prompt);
186 if ((n = get_tty_line()) < 0) {
190 if (modified && !scripted) {
191 fputs("?\n", stderr);
192 errmsg = "warning: file modified";
194 fprintf(stderr, garrulous ?
195 "script, line %d: %s\n" :
205 } else if (ibuf[n - 1] != '\n') {
207 errmsg = "unexpected end-of-file";
213 if ((status = extract_addr_range()) >= 0 &&
214 (status = exec_command()) >= 0)
216 (status = display_lines(current_addr, current_addr,
224 fputs("?\n", stderr); /* give warning */
225 errmsg = "warning: file modified";
227 fprintf(stderr, garrulous ?
228 "script, line %d: %s\n" :
235 fprintf(stderr, garrulous ?
236 "script, line %d: %s\n" : "",
239 fprintf(stderr, garrulous ? "%s\n" : "",
243 fputs("?\n", stderr);
245 fprintf(stderr, garrulous ?
246 "script, line %d: %s\n" : "",
256 long first_addr, second_addr, addr_cnt;
258 /* extract_addr_range: get line addresses from the command buffer until an
259 illegal address is seen; return status */
261 extract_addr_range(void)
266 first_addr = second_addr = current_addr;
267 while ((addr = next_addr()) >= 0) {
269 first_addr = second_addr;
271 if (*ibufp != ',' && *ibufp != ';')
273 else if (*ibufp++ == ';')
276 if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
277 first_addr = second_addr;
278 return (addr == ERR) ? ERR : 0;
282 #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
284 #define MUST_BE_FIRST() do { \
286 errmsg = "invalid address"; \
291 /* next_addr: return the next line address in the command buffer */
296 long addr = current_addr;
302 for (hd = ibufp;; first = 0)
303 switch (c = *ibufp) {
311 if (isdigit((unsigned char)*ibufp)) {
313 addr += (c == '-' || c == '^') ? -n : n;
314 } else if (!isspace((unsigned char)c))
315 addr += (c == '-' || c == '^') ? -1 : 1;
317 case '0': case '1': case '2':
318 case '3': case '4': case '5':
319 case '6': case '7': case '8': case '9':
327 addr = (c == '.') ? current_addr : addr_last;
332 if ((addr = get_matching_node_addr(
333 get_compiled_pattern(), c == '/')) < 0)
335 else if (c == *ibufp)
341 if ((addr = get_marked_node_addr(*ibufp++)) < 0)
350 second_addr = (c == ';') ? current_addr : 1;
358 else if (addr < 0 || addr_last < addr) {
359 errmsg = "invalid address";
369 /* GET_THIRD_ADDR: get a legal address from the command buffer */
370 #define GET_THIRD_ADDR(addr) \
374 ol1 = first_addr, ol2 = second_addr; \
375 if (extract_addr_range() < 0) \
377 else if (addr_cnt == 0) { \
378 errmsg = "destination expected"; \
380 } else if (second_addr < 0 || addr_last < second_addr) { \
381 errmsg = "invalid address"; \
384 addr = second_addr; \
385 first_addr = ol1, second_addr = ol2; \
387 #else /* BACKWARDS */
388 /* GET_THIRD_ADDR: get a legal address from the command buffer */
389 #define GET_THIRD_ADDR(addr) \
393 ol1 = first_addr, ol2 = second_addr; \
394 if (extract_addr_range() < 0) \
396 if (second_addr < 0 || addr_last < second_addr) { \
397 errmsg = "invalid address"; \
400 addr = second_addr; \
401 first_addr = ol1, second_addr = ol2; \
406 /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
407 #define GET_COMMAND_SUFFIX() { \
412 gflag |= GPR, ibufp++; \
415 gflag |= GLS, ibufp++; \
418 gflag |= GNP, ibufp++; \
424 if (*ibufp++ != '\n') { \
425 errmsg = "invalid command suffix"; \
432 #define SGG 001 /* complement previous global substitute suffix */
433 #define SGP 002 /* complement previous print suffix */
434 #define SGR 004 /* use last regex instead of last pat */
435 #define SGF 010 /* repeat last substitution */
437 int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
439 long rows = 22; /* scroll length: ws_row - 2 */
441 /* exec_command: execute the next command in command buffer; return print
446 static pattern_t *pat = NULL;
447 static int sgflag = 0;
448 static long sgnum = 0;
459 switch(c = *ibufp++) {
461 GET_COMMAND_SUFFIX();
462 if (!isglobal) clear_undo_stack();
463 if (append_lines(second_addr) < 0)
467 if (check_addr_range(current_addr, current_addr) < 0)
469 GET_COMMAND_SUFFIX();
470 if (!isglobal) clear_undo_stack();
471 if (delete_lines(first_addr, second_addr) < 0 ||
472 append_lines(current_addr) < 0)
476 if (check_addr_range(current_addr, current_addr) < 0)
478 GET_COMMAND_SUFFIX();
479 if (!isglobal) clear_undo_stack();
480 if (delete_lines(first_addr, second_addr) < 0)
482 else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
486 if (modified && !scripted)
491 errmsg = "unexpected address";
493 } else if (!isspace((unsigned char)*ibufp)) {
494 errmsg = "unexpected command suffix";
496 } else if ((fnp = get_filename()) == NULL)
498 GET_COMMAND_SUFFIX();
499 if (delete_lines(1, addr_last) < 0)
502 if (close_sbuf() < 0)
504 else if (open_sbuf() < 0)
506 if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
508 if (*fnp == '\0' && *old_filename == '\0') {
509 errmsg = "no current filename";
513 if (read_file(*fnp ? fnp : old_filename, 0) < 0)
517 u_current_addr = u_addr_last = -1;
521 errmsg = "unexpected address";
523 } else if (!isspace((unsigned char)*ibufp)) {
524 errmsg = "unexpected command suffix";
526 } else if ((fnp = get_filename()) == NULL)
528 else if (*fnp == '!') {
529 errmsg = "invalid redirection";
532 GET_COMMAND_SUFFIX();
533 if (*fnp) strcpy(old_filename, fnp);
534 printf("%s\n", strip_escapes(old_filename));
541 errmsg = "cannot nest global commands";
543 } else if (check_addr_range(1, addr_last) < 0)
545 else if (build_active_list(c == 'g' || c == 'G') < 0)
547 else if ((n = (c == 'G' || c == 'V')))
548 GET_COMMAND_SUFFIX();
550 if (exec_global(n, gflag) < 0)
555 errmsg = "unexpected address";
558 GET_COMMAND_SUFFIX();
559 if (*errmsg) fprintf(stderr, "%s\n", errmsg);
563 errmsg = "unexpected address";
566 GET_COMMAND_SUFFIX();
567 if ((garrulous = 1 - garrulous) && *errmsg)
568 fprintf(stderr, "%s\n", errmsg);
571 if (second_addr == 0) {
572 errmsg = "invalid address";
575 GET_COMMAND_SUFFIX();
576 if (!isglobal) clear_undo_stack();
577 if (append_lines(second_addr - 1) < 0)
581 if (check_addr_range(current_addr, current_addr + 1) < 0)
583 GET_COMMAND_SUFFIX();
584 if (!isglobal) clear_undo_stack();
585 if (first_addr != second_addr &&
586 join_lines(first_addr, second_addr) < 0)
591 if (second_addr == 0) {
592 errmsg = "invalid address";
595 GET_COMMAND_SUFFIX();
596 if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
600 if (check_addr_range(current_addr, current_addr) < 0)
602 GET_COMMAND_SUFFIX();
603 if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
608 if (check_addr_range(current_addr, current_addr) < 0)
610 GET_THIRD_ADDR(addr);
611 if (first_addr <= addr && addr < second_addr) {
612 errmsg = "invalid destination";
615 GET_COMMAND_SUFFIX();
616 if (!isglobal) clear_undo_stack();
617 if (move_lines(addr) < 0)
621 if (check_addr_range(current_addr, current_addr) < 0)
623 GET_COMMAND_SUFFIX();
624 if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
629 if (check_addr_range(current_addr, current_addr) < 0)
631 GET_COMMAND_SUFFIX();
632 if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
638 errmsg = "unexpected address";
641 GET_COMMAND_SUFFIX();
642 prompt = prompt ? NULL : optarg ? optarg : dps;
647 errmsg = "unexpected address";
650 GET_COMMAND_SUFFIX();
651 gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
654 if (!isspace((unsigned char)*ibufp)) {
655 errmsg = "unexpected command suffix";
657 } else if (addr_cnt == 0)
658 second_addr = addr_last;
659 if ((fnp = get_filename()) == NULL)
661 GET_COMMAND_SUFFIX();
662 if (!isglobal) clear_undo_stack();
663 if (*old_filename == '\0' && *fnp != '!')
664 strcpy(old_filename, fnp);
666 if (*fnp == '\0' && *old_filename == '\0') {
667 errmsg = "no current filename";
671 if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
673 else if (addr && addr != addr_last)
694 case '0': case '1': case '2': case '3': case '4':
695 case '5': case '6': case '7': case '8': case '9':
696 STRTOL(sgnum, ibufp);
698 sgflag &= ~GSG; /* override GSG */
702 errmsg = "invalid command suffix";
706 } while (sflags && *ibufp != '\n');
707 if (sflags && !pat) {
708 errmsg = "no previous substitution";
710 } else if (sflags & SGG)
711 sgnum = 0; /* override numeric arg */
712 if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
713 errmsg = "invalid pattern delimiter";
718 if ((!sflags || (sflags & SGR)) &&
719 (tpat = get_compiled_pattern()) == NULL) {
722 } else if (tpat != pat) {
728 patlock = 1; /* reserve pattern */
731 if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
740 sgflag ^= GPR, sgflag &= ~(GLS | GNP);
744 sgflag |= GPR, ibufp++;
747 sgflag |= GLS, ibufp++;
750 sgflag |= GNP, ibufp++;
756 if (check_addr_range(current_addr, current_addr) < 0)
758 GET_COMMAND_SUFFIX();
759 if (!isglobal) clear_undo_stack();
760 if (search_and_replace(pat, sgflag, sgnum) < 0)
764 if (check_addr_range(current_addr, current_addr) < 0)
766 GET_THIRD_ADDR(addr);
767 GET_COMMAND_SUFFIX();
768 if (!isglobal) clear_undo_stack();
769 if (copy_lines(addr) < 0)
774 errmsg = "unexpected address";
777 GET_COMMAND_SUFFIX();
778 if (pop_undo_stack() < 0)
783 if ((n = *ibufp) == 'q' || n == 'Q') {
787 if (!isspace((unsigned char)*ibufp)) {
788 errmsg = "unexpected command suffix";
790 } else if ((fnp = get_filename()) == NULL)
792 if (addr_cnt == 0 && !addr_last)
793 first_addr = second_addr = 0;
794 else if (check_addr_range(1, addr_last) < 0)
796 GET_COMMAND_SUFFIX();
797 if (*old_filename == '\0' && *fnp != '!')
798 strcpy(old_filename, fnp);
800 if (*fnp == '\0' && *old_filename == '\0') {
801 errmsg = "no current filename";
805 if ((addr = write_file(*fnp ? fnp : old_filename,
806 (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
808 else if (addr == addr_last)
810 else if (modified && !scripted && n == 'q')
815 errmsg = "unexpected address";
818 GET_COMMAND_SUFFIX();
823 errmsg = "crypt unavailable";
828 if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
830 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
833 else if ('0' < *ibufp && *ibufp <= '9')
835 GET_COMMAND_SUFFIX();
836 if (display_lines(second_addr, min(addr_last,
837 second_addr + rows), gflag) < 0)
842 GET_COMMAND_SUFFIX();
843 printf("%ld\n", addr_cnt ? second_addr : addr_last);
847 errmsg = "unexpected address";
849 } else if ((sflags = get_shell_command()) < 0)
851 GET_COMMAND_SUFFIX();
852 if (sflags) printf("%s\n", shcmd + 1);
854 if (!scripted) printf("!\n");
858 if (check_addr_range(first_addr = 1, current_addr + 1) < 0
860 if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
862 || display_lines(second_addr, second_addr, 0) < 0)
866 errmsg = "unknown command";
873 /* check_addr_range: return status of address range check */
875 check_addr_range(long n, long m)
881 if (first_addr > second_addr || 1 > first_addr ||
882 second_addr > addr_last) {
883 errmsg = "invalid address";
890 /* get_matching_node_addr: return the address of the next line matching a
891 pattern in a given direction. wrap around begin/end of editor buffer if
894 get_matching_node_addr(pattern_t *pat, int dir)
897 long n = current_addr;
900 if (!pat) return ERR;
902 if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
903 lp = get_addressed_line_node(n);
904 if ((s = get_sbuf_line(lp)) == NULL)
907 NUL_TO_NEWLINE(s, lp->len);
908 if (!regexec(pat, s, 0, NULL, 0))
911 } while (n != current_addr);
917 /* get_filename: return pointer to copy of filename in the command buffer */
921 static char *file = NULL;
922 static int filesz = 0;
926 if (*ibufp != '\n') {
928 if (*ibufp == '\n') {
929 errmsg = "invalid filename";
931 } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
933 else if (*ibufp == '!') {
935 if ((n = get_shell_command()) < 0)
938 printf("%s\n", shcmd + 1);
940 } else if (n > PATH_MAX - 1) {
941 errmsg = "filename too long";
946 else if (*old_filename == '\0') {
947 errmsg = "no current filename";
951 REALLOC(file, filesz, PATH_MAX, NULL);
952 for (n = 0; *ibufp != '\n';)
953 file[n++] = *ibufp++;
955 return is_legal_filename(file) ? file : NULL;
959 /* get_shell_command: read a shell command from stdin; return substitution
962 get_shell_command(void)
964 static char *buf = NULL;
967 char *s; /* substitution char pointer */
972 errmsg = "shell access restricted";
974 } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
976 REALLOC(buf, n, j + 1, ERR);
977 buf[i++] = '!'; /* prefix command w/ bang */
978 while (*ibufp != '\n')
981 REALLOC(buf, n, i + 2, ERR);
983 if (*ibufp++ == '\\')
988 REALLOC(buf, n, i + 1, ERR);
992 else if (shcmd == NULL || *(shcmd + 1) == '\0')
994 else if (shcmd == NULL)
997 errmsg = "no previous command";
1000 REALLOC(buf, n, i + shcmdi, ERR);
1001 for (s = shcmd + 1; s < shcmd + shcmdi;)
1007 if (*old_filename == '\0') {
1008 errmsg = "no current filename";
1011 j = strlen(s = strip_escapes(old_filename));
1012 REALLOC(buf, n, i + j, ERR);
1018 REALLOC(shcmd, shcmdsz, i + 1, ERR);
1019 memcpy(shcmd, buf, i);
1020 shcmd[shcmdi = i] = '\0';
1021 return *s == '!' || *s == '%';
1025 /* append_lines: insert text from stdin to after line n; stop when either a
1026 single period is read or EOF; return status */
1028 append_lines(long n)
1031 const char *lp = ibuf;
1035 for (current_addr = n;;) {
1037 if ((l = get_tty_line()) < 0)
1039 else if (l == 0 || ibuf[l - 1] != '\n') {
1044 } else if (*(lp = ibufp) == '\0')
1047 while (*ibufp++ != '\n')
1051 if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
1057 if ((lp = put_sbuf_line(lp)) == NULL) {
1061 up->t = get_addressed_line_node(current_addr);
1062 else if ((up = push_undo_stack(UADD, current_addr,
1063 current_addr)) == NULL) {
1067 } while (lp != eot);
1075 /* join_lines: replace a range of lines with the joined text of those lines */
1077 join_lines(long from, long to)
1079 static char *buf = NULL;
1086 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1087 bp = get_addressed_line_node(from);
1088 for (; bp != ep; bp = bp->q_forw) {
1089 if ((s = get_sbuf_line(bp)) == NULL)
1091 REALLOC(buf, n, size + bp->len, ERR);
1092 memcpy(buf + size, s, bp->len);
1095 REALLOC(buf, n, size + 2, ERR);
1096 memcpy(buf + size, "\n", 2);
1097 if (delete_lines(from, to) < 0)
1099 current_addr = from - 1;
1101 if (put_sbuf_line(buf) == NULL ||
1102 push_undo_stack(UADD, current_addr, current_addr) == NULL) {
1112 /* move_lines: move a range of lines */
1114 move_lines(long addr)
1116 line_t *b1, *a1, *b2, *a2;
1117 long n = INC_MOD(second_addr, addr_last);
1118 long p = first_addr - 1;
1119 int done = (addr == first_addr - 1 || addr == second_addr);
1123 a2 = get_addressed_line_node(n);
1124 b2 = get_addressed_line_node(p);
1125 current_addr = second_addr;
1126 } else if (push_undo_stack(UMOV, p, n) == NULL ||
1127 push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
1131 a1 = get_addressed_line_node(n);
1132 if (addr < first_addr) {
1133 b1 = get_addressed_line_node(p);
1134 b2 = get_addressed_line_node(addr);
1135 /* this get_addressed_line_node last! */
1137 b2 = get_addressed_line_node(addr);
1138 b1 = get_addressed_line_node(p);
1139 /* this get_addressed_line_node last! */
1142 REQUE(b2, b1->q_forw);
1143 REQUE(a1->q_back, a2);
1145 current_addr = addr + ((addr < first_addr) ?
1146 second_addr - first_addr + 1 : 0);
1149 unset_active_nodes(b2->q_forw, a2);
1156 /* copy_lines: copy a range of lines; return status */
1158 copy_lines(long addr)
1160 line_t *lp, *np = get_addressed_line_node(first_addr);
1162 long n = second_addr - first_addr + 1;
1165 current_addr = addr;
1166 if (first_addr <= addr && addr < second_addr) {
1167 n = addr - first_addr + 1;
1168 m = second_addr - addr;
1170 for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
1171 for (; n-- > 0; np = np->q_forw) {
1173 if ((lp = dup_line_node(np)) == NULL) {
1180 else if ((up = push_undo_stack(UADD, current_addr,
1181 current_addr)) == NULL) {
1192 /* delete_lines: delete a range of lines */
1194 delete_lines(long from, long to)
1199 if (push_undo_stack(UDEL, from, to) == NULL) {
1203 n = get_addressed_line_node(INC_MOD(to, addr_last));
1204 p = get_addressed_line_node(from - 1);
1205 /* this get_addressed_line_node last! */
1207 unset_active_nodes(p->q_forw, n);
1209 addr_last -= to - from + 1;
1210 current_addr = from - 1;
1217 /* display_lines: print a range of lines to stdout */
1219 display_lines(long from, long to, int gflag)
1226 errmsg = "invalid address";
1229 ep = get_addressed_line_node(INC_MOD(to, addr_last));
1230 bp = get_addressed_line_node(from);
1231 for (; bp != ep; bp = bp->q_forw) {
1232 if ((s = get_sbuf_line(bp)) == NULL)
1234 if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
1241 #define MAXMARK 26 /* max number of marks */
1243 line_t *mark[MAXMARK]; /* line markers */
1244 int markno; /* line marker count */
1246 /* mark_line_node: set a line node mark */
1248 mark_line_node(line_t *lp, int n)
1250 if (!islower((unsigned char)n)) {
1251 errmsg = "invalid mark character";
1253 } else if (mark[n - 'a'] == NULL)
1260 /* get_marked_node_addr: return address of a marked line */
1262 get_marked_node_addr(int n)
1264 if (!islower((unsigned char)n)) {
1265 errmsg = "invalid mark character";
1268 return get_line_node_addr(mark[n - 'a']);
1272 /* unmark_line_node: clear line node mark */
1274 unmark_line_node(line_t *lp)
1278 for (i = 0; markno && i < MAXMARK; i++)
1279 if (mark[i] == lp) {
1286 /* dup_line_node: return a pointer to a copy of a line node */
1288 dup_line_node(line_t *lp)
1292 if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
1293 fprintf(stderr, "%s\n", strerror(errno));
1294 errmsg = "out of memory";
1297 np->seek = lp->seek;
1303 /* has_trailing_escape: return the parity of escapes preceding a character
1306 has_trailing_escape(char *s, char *t)
1308 return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
1312 /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
1314 strip_escapes(const char *s)
1316 static char *file = NULL;
1317 static int filesz = 0;
1321 REALLOC(file, filesz, PATH_MAX, NULL);
1322 while (i < filesz - 1 /* Worry about a possible trailing escape */
1323 && (file[i++] = (*s == '\\') ? *++s : *s))
1330 signal_hup(int signo)
1333 sigflags |= (1 << (signo - 1));
1340 signal_int(int signo)
1343 sigflags |= (1 << (signo - 1));
1350 handle_hup(int signo)
1352 char *hup = NULL; /* hup filename */
1354 char ed_hup[] = "ed.hup";
1359 sigflags &= ~(1 << (signo - 1));
1360 if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
1361 (s = getenv("HOME")) != NULL &&
1362 (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
1363 (hup = (char *) malloc(n + 10)) != NULL) {
1365 if (hup[n - 1] != '/')
1366 hup[n] = '/', hup[n+1] = '\0';
1367 strcat(hup, "ed.hup");
1368 write_file(hup, "w", 1, addr_last);
1375 handle_int(int signo)
1379 sigflags &= ~(1 << (signo - 1));
1380 #ifdef _POSIX_SOURCE
1381 siglongjmp(env, -1);
1388 int cols = 72; /* wrap column */
1391 handle_winch(int signo)
1393 int save_errno = errno;
1395 struct winsize ws; /* window size structure */
1397 sigflags &= ~(1 << (signo - 1));
1398 if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
1399 if (ws.ws_row > 2) rows = ws.ws_row - 2;
1400 if (ws.ws_col > 8) cols = ws.ws_col - 8;
1406 /* is_legal_filename: return a legal filename */
1408 is_legal_filename(char *s)
1410 if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
1411 errmsg = "shell access restricted";