/bin/ed/main.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 1416 lines · 1229 code · 101 blank · 86 comment · 461 complexity · 0a58accc4c917837a060587fc3dc93c2 MD5 · raw file
- /* main.c: This file contains the main control and user-interface routines
- for the ed line editor. */
- /*-
- * Copyright (c) 1993 Andrew Moore, Talke Studio.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #ifndef lint
- #if 0
- static const char copyright[] =
- "@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\
- All rights reserved.\n";
- #endif
- #endif /* not lint */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- /*
- * CREDITS
- *
- * This program is based on the editor algorithm described in
- * Brian W. Kernighan and P. J. Plauger's book "Software Tools
- * in Pascal," Addison-Wesley, 1981.
- *
- * The buffering algorithm is attributed to Rodney Ruddock of
- * the University of Guelph, Guelph, Ontario.
- *
- * The cbc.c encryption code is adapted from
- * the bdes program by Matt Bishop of Dartmouth College,
- * Hanover, NH.
- *
- */
- #include <sys/types.h>
- #include <sys/ioctl.h>
- #include <sys/wait.h>
- #include <ctype.h>
- #include <locale.h>
- #include <pwd.h>
- #include <setjmp.h>
- #include "ed.h"
- #ifdef _POSIX_SOURCE
- sigjmp_buf env;
- #else
- jmp_buf env;
- #endif
- /* static buffers */
- char stdinbuf[1]; /* stdin buffer */
- char *shcmd; /* shell command buffer */
- int shcmdsz; /* shell command buffer size */
- int shcmdi; /* shell command buffer index */
- char *ibuf; /* ed command-line buffer */
- int ibufsz; /* ed command-line buffer size */
- char *ibufp; /* pointer to ed command-line buffer */
- /* global flags */
- int des = 0; /* if set, use crypt(3) for i/o */
- int garrulous = 0; /* if set, print all error messages */
- int isbinary; /* if set, buffer contains ASCII NULs */
- int isglobal; /* if set, doing a global command */
- int modified; /* if set, buffer modified since last write */
- int mutex = 0; /* if set, signals set "sigflags" */
- int red = 0; /* if set, restrict shell/directory access */
- int scripted = 0; /* if set, suppress diagnostics */
- int sigflags = 0; /* if set, signals received while mutex set */
- int sigactive = 0; /* if set, signal handlers are enabled */
- char old_filename[PATH_MAX] = ""; /* default filename */
- long current_addr; /* current address in editor buffer */
- long addr_last; /* last address in editor buffer */
- int lineno; /* script line number */
- const char *prompt; /* command-line prompt */
- const char *dps = "*"; /* default command-line prompt */
- const char usage[] = "usage: %s [-] [-sx] [-p string] [file]\n";
- /* ed: line editor */
- int
- main(volatile int argc, char ** volatile argv)
- {
- int c, n;
- long status = 0;
- (void)setlocale(LC_ALL, "");
- red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
- top:
- while ((c = getopt(argc, argv, "p:sx")) != -1)
- switch(c) {
- case 'p': /* set prompt */
- prompt = optarg;
- break;
- case 's': /* run script */
- scripted = 1;
- break;
- case 'x': /* use crypt */
- #ifdef DES
- des = get_keyword();
- #else
- fprintf(stderr, "crypt unavailable\n?\n");
- #endif
- break;
- default:
- fprintf(stderr, usage, red ? "red" : "ed");
- exit(1);
- }
- argv += optind;
- argc -= optind;
- if (argc && **argv == '-') {
- scripted = 1;
- if (argc > 1) {
- optind = 1;
- goto top;
- }
- argv++;
- argc--;
- }
- /* assert: reliable signals! */
- #ifdef SIGWINCH
- handle_winch(SIGWINCH);
- if (isatty(0)) signal(SIGWINCH, handle_winch);
- #endif
- signal(SIGHUP, signal_hup);
- signal(SIGQUIT, SIG_IGN);
- signal(SIGINT, signal_int);
- #ifdef _POSIX_SOURCE
- if ((status = sigsetjmp(env, 1)))
- #else
- if ((status = setjmp(env)))
- #endif
- {
- fputs("\n?\n", stderr);
- errmsg = "interrupt";
- } else {
- init_buffers();
- sigactive = 1; /* enable signal handlers */
- if (argc && **argv && is_legal_filename(*argv)) {
- if (read_file(*argv, 0) < 0 && !isatty(0))
- quit(2);
- else if (**argv != '!')
- if (strlcpy(old_filename, *argv, sizeof(old_filename))
- >= sizeof(old_filename))
- quit(2);
- } else if (argc) {
- fputs("?\n", stderr);
- if (**argv == '\0')
- errmsg = "invalid filename";
- if (!isatty(0))
- quit(2);
- }
- }
- for (;;) {
- if (status < 0 && garrulous)
- fprintf(stderr, "%s\n", errmsg);
- if (prompt) {
- printf("%s", prompt);
- fflush(stdout);
- }
- if ((n = get_tty_line()) < 0) {
- status = ERR;
- continue;
- } else if (n == 0) {
- if (modified && !scripted) {
- fputs("?\n", stderr);
- errmsg = "warning: file modified";
- if (!isatty(0)) {
- if (garrulous)
- fprintf(stderr,
- "script, line %d: %s\n",
- lineno, errmsg);
- quit(2);
- }
- clearerr(stdin);
- modified = 0;
- status = EMOD;
- continue;
- } else
- quit(0);
- } else if (ibuf[n - 1] != '\n') {
- /* discard line */
- errmsg = "unexpected end-of-file";
- clearerr(stdin);
- status = ERR;
- continue;
- }
- isglobal = 0;
- if ((status = extract_addr_range()) >= 0 &&
- (status = exec_command()) >= 0)
- if (!status ||
- (status = display_lines(current_addr, current_addr,
- status)) >= 0)
- continue;
- switch (status) {
- case EOF:
- quit(0);
- case EMOD:
- modified = 0;
- fputs("?\n", stderr); /* give warning */
- errmsg = "warning: file modified";
- if (!isatty(0)) {
- if (garrulous)
- fprintf(stderr, "script, line %d: %s\n",
- lineno, errmsg);
- quit(2);
- }
- break;
- case FATAL:
- if (!isatty(0)) {
- if (garrulous)
- fprintf(stderr, "script, line %d: %s\n",
- lineno, errmsg);
- } else if (garrulous)
- fprintf(stderr, "%s\n", errmsg);
- quit(3);
- default:
- fputs("?\n", stderr);
- if (!isatty(0)) {
- if (garrulous)
- fprintf(stderr, "script, line %d: %s\n",
- lineno, errmsg);
- quit(2);
- }
- break;
- }
- }
- /*NOTREACHED*/
- }
- long first_addr, second_addr, addr_cnt;
- /* extract_addr_range: get line addresses from the command buffer until an
- illegal address is seen; return status */
- int
- extract_addr_range(void)
- {
- long addr;
- addr_cnt = 0;
- first_addr = second_addr = current_addr;
- while ((addr = next_addr()) >= 0) {
- addr_cnt++;
- first_addr = second_addr;
- second_addr = addr;
- if (*ibufp != ',' && *ibufp != ';')
- break;
- else if (*ibufp++ == ';')
- current_addr = addr;
- }
- if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
- first_addr = second_addr;
- return (addr == ERR) ? ERR : 0;
- }
- #define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
- #define MUST_BE_FIRST() do { \
- if (!first) { \
- errmsg = "invalid address"; \
- return ERR; \
- } \
- } while (0)
- /* next_addr: return the next line address in the command buffer */
- long
- next_addr(void)
- {
- const char *hd;
- long addr = current_addr;
- long n;
- int first = 1;
- int c;
- SKIP_BLANKS();
- for (hd = ibufp;; first = 0)
- switch (c = *ibufp) {
- case '+':
- case '\t':
- case ' ':
- case '-':
- case '^':
- ibufp++;
- SKIP_BLANKS();
- if (isdigit((unsigned char)*ibufp)) {
- STRTOL(n, ibufp);
- addr += (c == '-' || c == '^') ? -n : n;
- } else if (!isspace((unsigned char)c))
- addr += (c == '-' || c == '^') ? -1 : 1;
- break;
- case '0': case '1': case '2':
- case '3': case '4': case '5':
- case '6': case '7': case '8': case '9':
- MUST_BE_FIRST();
- STRTOL(addr, ibufp);
- break;
- case '.':
- case '$':
- MUST_BE_FIRST();
- ibufp++;
- addr = (c == '.') ? current_addr : addr_last;
- break;
- case '/':
- case '?':
- MUST_BE_FIRST();
- if ((addr = get_matching_node_addr(
- get_compiled_pattern(), c == '/')) < 0)
- return ERR;
- else if (c == *ibufp)
- ibufp++;
- break;
- case '\'':
- MUST_BE_FIRST();
- ibufp++;
- if ((addr = get_marked_node_addr(*ibufp++)) < 0)
- return ERR;
- break;
- case '%':
- case ',':
- case ';':
- if (first) {
- ibufp++;
- addr_cnt++;
- second_addr = (c == ';') ? current_addr : 1;
- addr = addr_last;
- break;
- }
- /* FALLTHROUGH */
- default:
- if (ibufp == hd)
- return EOF;
- else if (addr < 0 || addr_last < addr) {
- errmsg = "invalid address";
- return ERR;
- } else
- return addr;
- }
- /* NOTREACHED */
- }
- #ifdef BACKWARDS
- /* GET_THIRD_ADDR: get a legal address from the command buffer */
- #define GET_THIRD_ADDR(addr) \
- { \
- long ol1, ol2; \
- \
- ol1 = first_addr, ol2 = second_addr; \
- if (extract_addr_range() < 0) \
- return ERR; \
- else if (addr_cnt == 0) { \
- errmsg = "destination expected"; \
- return ERR; \
- } else if (second_addr < 0 || addr_last < second_addr) { \
- errmsg = "invalid address"; \
- return ERR; \
- } \
- addr = second_addr; \
- first_addr = ol1, second_addr = ol2; \
- }
- #else /* BACKWARDS */
- /* GET_THIRD_ADDR: get a legal address from the command buffer */
- #define GET_THIRD_ADDR(addr) \
- { \
- long ol1, ol2; \
- \
- ol1 = first_addr, ol2 = second_addr; \
- if (extract_addr_range() < 0) \
- return ERR; \
- if (second_addr < 0 || addr_last < second_addr) { \
- errmsg = "invalid address"; \
- return ERR; \
- } \
- addr = second_addr; \
- first_addr = ol1, second_addr = ol2; \
- }
- #endif
- /* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
- #define GET_COMMAND_SUFFIX() { \
- int done = 0; \
- do { \
- switch(*ibufp) { \
- case 'p': \
- gflag |= GPR, ibufp++; \
- break; \
- case 'l': \
- gflag |= GLS, ibufp++; \
- break; \
- case 'n': \
- gflag |= GNP, ibufp++; \
- break; \
- default: \
- done++; \
- } \
- } while (!done); \
- if (*ibufp++ != '\n') { \
- errmsg = "invalid command suffix"; \
- return ERR; \
- } \
- }
- /* sflags */
- #define SGG 001 /* complement previous global substitute suffix */
- #define SGP 002 /* complement previous print suffix */
- #define SGR 004 /* use last regex instead of last pat */
- #define SGF 010 /* repeat last substitution */
- int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
- long rows = 22; /* scroll length: ws_row - 2 */
- /* exec_command: execute the next command in command buffer; return print
- request, if any */
- int
- exec_command(void)
- {
- static pattern_t *pat = NULL;
- static int sgflag = 0;
- static long sgnum = 0;
- pattern_t *tpat;
- char *fnp;
- int gflag = 0;
- int sflags = 0;
- long addr = 0;
- int n = 0;
- int c;
- SKIP_BLANKS();
- switch(c = *ibufp++) {
- case 'a':
- GET_COMMAND_SUFFIX();
- if (!isglobal) clear_undo_stack();
- if (append_lines(second_addr) < 0)
- return ERR;
- break;
- case 'c':
- if (check_addr_range(current_addr, current_addr) < 0)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (!isglobal) clear_undo_stack();
- if (delete_lines(first_addr, second_addr) < 0 ||
- append_lines(current_addr) < 0)
- return ERR;
- break;
- case 'd':
- if (check_addr_range(current_addr, current_addr) < 0)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (!isglobal) clear_undo_stack();
- if (delete_lines(first_addr, second_addr) < 0)
- return ERR;
- else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
- current_addr = addr;
- break;
- case 'e':
- if (modified && !scripted)
- return EMOD;
- /* FALLTHROUGH */
- case 'E':
- if (addr_cnt > 0) {
- errmsg = "unexpected address";
- return ERR;
- } else if (!isspace((unsigned char)*ibufp)) {
- errmsg = "unexpected command suffix";
- return ERR;
- } else if ((fnp = get_filename()) == NULL)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (delete_lines(1, addr_last) < 0)
- return ERR;
- clear_undo_stack();
- if (close_sbuf() < 0)
- return ERR;
- else if (open_sbuf() < 0)
- return FATAL;
- if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
- #ifdef BACKWARDS
- if (*fnp == '\0' && *old_filename == '\0') {
- errmsg = "no current filename";
- return ERR;
- }
- #endif
- if (read_file(*fnp ? fnp : old_filename, 0) < 0)
- return ERR;
- clear_undo_stack();
- modified = 0;
- u_current_addr = u_addr_last = -1;
- break;
- case 'f':
- if (addr_cnt > 0) {
- errmsg = "unexpected address";
- return ERR;
- } else if (!isspace((unsigned char)*ibufp)) {
- errmsg = "unexpected command suffix";
- return ERR;
- } else if ((fnp = get_filename()) == NULL)
- return ERR;
- else if (*fnp == '!') {
- errmsg = "invalid redirection";
- return ERR;
- }
- GET_COMMAND_SUFFIX();
- if (*fnp) strcpy(old_filename, fnp);
- printf("%s\n", strip_escapes(old_filename));
- break;
- case 'g':
- case 'v':
- case 'G':
- case 'V':
- if (isglobal) {
- errmsg = "cannot nest global commands";
- return ERR;
- } else if (check_addr_range(1, addr_last) < 0)
- return ERR;
- else if (build_active_list(c == 'g' || c == 'G') < 0)
- return ERR;
- else if ((n = (c == 'G' || c == 'V')))
- GET_COMMAND_SUFFIX();
- isglobal++;
- if (exec_global(n, gflag) < 0)
- return ERR;
- break;
- case 'h':
- if (addr_cnt > 0) {
- errmsg = "unexpected address";
- return ERR;
- }
- GET_COMMAND_SUFFIX();
- if (*errmsg) fprintf(stderr, "%s\n", errmsg);
- break;
- case 'H':
- if (addr_cnt > 0) {
- errmsg = "unexpected address";
- return ERR;
- }
- GET_COMMAND_SUFFIX();
- if ((garrulous = 1 - garrulous) && *errmsg)
- fprintf(stderr, "%s\n", errmsg);
- break;
- case 'i':
- if (second_addr == 0) {
- errmsg = "invalid address";
- return ERR;
- }
- GET_COMMAND_SUFFIX();
- if (!isglobal) clear_undo_stack();
- if (append_lines(second_addr - 1) < 0)
- return ERR;
- break;
- case 'j':
- if (check_addr_range(current_addr, current_addr + 1) < 0)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (!isglobal) clear_undo_stack();
- if (first_addr != second_addr &&
- join_lines(first_addr, second_addr) < 0)
- return ERR;
- break;
- case 'k':
- c = *ibufp++;
- if (second_addr == 0) {
- errmsg = "invalid address";
- return ERR;
- }
- GET_COMMAND_SUFFIX();
- if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
- return ERR;
- break;
- case 'l':
- if (check_addr_range(current_addr, current_addr) < 0)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
- return ERR;
- gflag = 0;
- break;
- case 'm':
- if (check_addr_range(current_addr, current_addr) < 0)
- return ERR;
- GET_THIRD_ADDR(addr);
- if (first_addr <= addr && addr < second_addr) {
- errmsg = "invalid destination";
- return ERR;
- }
- GET_COMMAND_SUFFIX();
- if (!isglobal) clear_undo_stack();
- if (move_lines(addr) < 0)
- return ERR;
- break;
- case 'n':
- if (check_addr_range(current_addr, current_addr) < 0)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
- return ERR;
- gflag = 0;
- break;
- case 'p':
- if (check_addr_range(current_addr, current_addr) < 0)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
- return ERR;
- gflag = 0;
- break;
- case 'P':
- if (addr_cnt > 0) {
- errmsg = "unexpected address";
- return ERR;
- }
- GET_COMMAND_SUFFIX();
- prompt = prompt ? NULL : optarg ? optarg : dps;
- break;
- case 'q':
- case 'Q':
- if (addr_cnt > 0) {
- errmsg = "unexpected address";
- return ERR;
- }
- GET_COMMAND_SUFFIX();
- gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
- break;
- case 'r':
- if (!isspace((unsigned char)*ibufp)) {
- errmsg = "unexpected command suffix";
- return ERR;
- } else if (addr_cnt == 0)
- second_addr = addr_last;
- if ((fnp = get_filename()) == NULL)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (!isglobal) clear_undo_stack();
- if (*old_filename == '\0' && *fnp != '!')
- strcpy(old_filename, fnp);
- #ifdef BACKWARDS
- if (*fnp == '\0' && *old_filename == '\0') {
- errmsg = "no current filename";
- return ERR;
- }
- #endif
- if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
- return ERR;
- else if (addr && addr != addr_last)
- modified = 1;
- break;
- case 's':
- do {
- switch(*ibufp) {
- case '\n':
- sflags |=SGF;
- break;
- case 'g':
- sflags |= SGG;
- ibufp++;
- break;
- case 'p':
- sflags |= SGP;
- ibufp++;
- break;
- case 'r':
- sflags |= SGR;
- ibufp++;
- break;
- case '0': case '1': case '2': case '3': case '4':
- case '5': case '6': case '7': case '8': case '9':
- STRTOL(sgnum, ibufp);
- sflags |= SGF;
- sgflag &= ~GSG; /* override GSG */
- break;
- default:
- if (sflags) {
- errmsg = "invalid command suffix";
- return ERR;
- }
- }
- } while (sflags && *ibufp != '\n');
- if (sflags && !pat) {
- errmsg = "no previous substitution";
- return ERR;
- } else if (sflags & SGG)
- sgnum = 0; /* override numeric arg */
- if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
- errmsg = "invalid pattern delimiter";
- return ERR;
- }
- tpat = pat;
- SPL1();
- if ((!sflags || (sflags & SGR)) &&
- (tpat = get_compiled_pattern()) == NULL) {
- SPL0();
- return ERR;
- } else if (tpat != pat) {
- if (pat) {
- regfree(pat);
- free(pat);
- }
- pat = tpat;
- patlock = 1; /* reserve pattern */
- }
- SPL0();
- if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
- return ERR;
- else if (isglobal)
- sgflag |= GLB;
- else
- sgflag &= ~GLB;
- if (sflags & SGG)
- sgflag ^= GSG;
- if (sflags & SGP)
- sgflag ^= GPR, sgflag &= ~(GLS | GNP);
- do {
- switch(*ibufp) {
- case 'p':
- sgflag |= GPR, ibufp++;
- break;
- case 'l':
- sgflag |= GLS, ibufp++;
- break;
- case 'n':
- sgflag |= GNP, ibufp++;
- break;
- default:
- n++;
- }
- } while (!n);
- if (check_addr_range(current_addr, current_addr) < 0)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (!isglobal) clear_undo_stack();
- if (search_and_replace(pat, sgflag, sgnum) < 0)
- return ERR;
- break;
- case 't':
- if (check_addr_range(current_addr, current_addr) < 0)
- return ERR;
- GET_THIRD_ADDR(addr);
- GET_COMMAND_SUFFIX();
- if (!isglobal) clear_undo_stack();
- if (copy_lines(addr) < 0)
- return ERR;
- break;
- case 'u':
- if (addr_cnt > 0) {
- errmsg = "unexpected address";
- return ERR;
- }
- GET_COMMAND_SUFFIX();
- if (pop_undo_stack() < 0)
- return ERR;
- break;
- case 'w':
- case 'W':
- if ((n = *ibufp) == 'q' || n == 'Q') {
- gflag = EOF;
- ibufp++;
- }
- if (!isspace((unsigned char)*ibufp)) {
- errmsg = "unexpected command suffix";
- return ERR;
- } else if ((fnp = get_filename()) == NULL)
- return ERR;
- if (addr_cnt == 0 && !addr_last)
- first_addr = second_addr = 0;
- else if (check_addr_range(1, addr_last) < 0)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (*old_filename == '\0' && *fnp != '!')
- strcpy(old_filename, fnp);
- #ifdef BACKWARDS
- if (*fnp == '\0' && *old_filename == '\0') {
- errmsg = "no current filename";
- return ERR;
- }
- #endif
- if ((addr = write_file(*fnp ? fnp : old_filename,
- (c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
- return ERR;
- else if (addr == addr_last)
- modified = 0;
- else if (modified && !scripted && n == 'q')
- gflag = EMOD;
- break;
- case 'x':
- if (addr_cnt > 0) {
- errmsg = "unexpected address";
- return ERR;
- }
- GET_COMMAND_SUFFIX();
- #ifdef DES
- des = get_keyword();
- break;
- #else
- errmsg = "crypt unavailable";
- return ERR;
- #endif
- case 'z':
- #ifdef BACKWARDS
- if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
- #else
- if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
- #endif
- return ERR;
- else if ('0' < *ibufp && *ibufp <= '9')
- STRTOL(rows, ibufp);
- GET_COMMAND_SUFFIX();
- if (display_lines(second_addr, min(addr_last,
- second_addr + rows), gflag) < 0)
- return ERR;
- gflag = 0;
- break;
- case '=':
- GET_COMMAND_SUFFIX();
- printf("%ld\n", addr_cnt ? second_addr : addr_last);
- break;
- case '!':
- if (addr_cnt > 0) {
- errmsg = "unexpected address";
- return ERR;
- } else if ((sflags = get_shell_command()) < 0)
- return ERR;
- GET_COMMAND_SUFFIX();
- if (sflags) printf("%s\n", shcmd + 1);
- system(shcmd + 1);
- if (!scripted) printf("!\n");
- break;
- case '\n':
- #ifdef BACKWARDS
- if (check_addr_range(first_addr = 1, current_addr + 1) < 0
- #else
- if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
- #endif
- || display_lines(second_addr, second_addr, 0) < 0)
- return ERR;
- break;
- default:
- errmsg = "unknown command";
- return ERR;
- }
- return gflag;
- }
- /* check_addr_range: return status of address range check */
- int
- check_addr_range(long n, long m)
- {
- if (addr_cnt == 0) {
- first_addr = n;
- second_addr = m;
- }
- if (first_addr > second_addr || 1 > first_addr ||
- second_addr > addr_last) {
- errmsg = "invalid address";
- return ERR;
- }
- return 0;
- }
- /* get_matching_node_addr: return the address of the next line matching a
- pattern in a given direction. wrap around begin/end of editor buffer if
- necessary */
- long
- get_matching_node_addr(pattern_t *pat, int dir)
- {
- char *s;
- long n = current_addr;
- line_t *lp;
- if (!pat) return ERR;
- do {
- if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
- lp = get_addressed_line_node(n);
- if ((s = get_sbuf_line(lp)) == NULL)
- return ERR;
- if (isbinary)
- NUL_TO_NEWLINE(s, lp->len);
- if (!regexec(pat, s, 0, NULL, 0))
- return n;
- }
- } while (n != current_addr);
- errmsg = "no match";
- return ERR;
- }
- /* get_filename: return pointer to copy of filename in the command buffer */
- char *
- get_filename(void)
- {
- static char *file = NULL;
- static int filesz = 0;
- int n;
- if (*ibufp != '\n') {
- SKIP_BLANKS();
- if (*ibufp == '\n') {
- errmsg = "invalid filename";
- return NULL;
- } else if ((ibufp = get_extended_line(&n, 1)) == NULL)
- return NULL;
- else if (*ibufp == '!') {
- ibufp++;
- if ((n = get_shell_command()) < 0)
- return NULL;
- if (n)
- printf("%s\n", shcmd + 1);
- return shcmd;
- } else if (n > PATH_MAX - 1) {
- errmsg = "filename too long";
- return NULL;
- }
- }
- #ifndef BACKWARDS
- else if (*old_filename == '\0') {
- errmsg = "no current filename";
- return NULL;
- }
- #endif
- REALLOC(file, filesz, PATH_MAX, NULL);
- for (n = 0; *ibufp != '\n';)
- file[n++] = *ibufp++;
- file[n] = '\0';
- return is_legal_filename(file) ? file : NULL;
- }
- /* get_shell_command: read a shell command from stdin; return substitution
- status */
- int
- get_shell_command(void)
- {
- static char *buf = NULL;
- static int n = 0;
- char *s; /* substitution char pointer */
- int i = 0;
- int j = 0;
- if (red) {
- errmsg = "shell access restricted";
- return ERR;
- } else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
- return ERR;
- REALLOC(buf, n, j + 1, ERR);
- buf[i++] = '!'; /* prefix command w/ bang */
- while (*ibufp != '\n')
- switch (*ibufp) {
- default:
- REALLOC(buf, n, i + 2, ERR);
- buf[i++] = *ibufp;
- if (*ibufp++ == '\\')
- buf[i++] = *ibufp++;
- break;
- case '!':
- if (s != ibufp) {
- REALLOC(buf, n, i + 1, ERR);
- buf[i++] = *ibufp++;
- }
- #ifdef BACKWARDS
- else if (shcmd == NULL || *(shcmd + 1) == '\0')
- #else
- else if (shcmd == NULL)
- #endif
- {
- errmsg = "no previous command";
- return ERR;
- } else {
- REALLOC(buf, n, i + shcmdi, ERR);
- for (s = shcmd + 1; s < shcmd + shcmdi;)
- buf[i++] = *s++;
- s = ibufp++;
- }
- break;
- case '%':
- if (*old_filename == '\0') {
- errmsg = "no current filename";
- return ERR;
- }
- j = strlen(s = strip_escapes(old_filename));
- REALLOC(buf, n, i + j, ERR);
- while (j--)
- buf[i++] = *s++;
- s = ibufp++;
- break;
- }
- REALLOC(shcmd, shcmdsz, i + 1, ERR);
- memcpy(shcmd, buf, i);
- shcmd[shcmdi = i] = '\0';
- return *s == '!' || *s == '%';
- }
- /* append_lines: insert text from stdin to after line n; stop when either a
- single period is read or EOF; return status */
- int
- append_lines(long n)
- {
- int l;
- const char *lp = ibuf;
- const char *eot;
- undo_t *up = NULL;
- for (current_addr = n;;) {
- if (!isglobal) {
- if ((l = get_tty_line()) < 0)
- return ERR;
- else if (l == 0 || ibuf[l - 1] != '\n') {
- clearerr(stdin);
- return l ? EOF : 0;
- }
- lp = ibuf;
- } else if (*(lp = ibufp) == '\0')
- return 0;
- else {
- while (*ibufp++ != '\n')
- ;
- l = ibufp - lp;
- }
- if (l == 2 && lp[0] == '.' && lp[1] == '\n') {
- return 0;
- }
- eot = lp + l;
- SPL1();
- do {
- if ((lp = put_sbuf_line(lp)) == NULL) {
- SPL0();
- return ERR;
- } else if (up)
- up->t = get_addressed_line_node(current_addr);
- else if ((up = push_undo_stack(UADD, current_addr,
- current_addr)) == NULL) {
- SPL0();
- return ERR;
- }
- } while (lp != eot);
- modified = 1;
- SPL0();
- }
- /* NOTREACHED */
- }
- /* join_lines: replace a range of lines with the joined text of those lines */
- int
- join_lines(long from, long to)
- {
- static char *buf = NULL;
- static int n;
- char *s;
- int size = 0;
- line_t *bp, *ep;
- ep = get_addressed_line_node(INC_MOD(to, addr_last));
- bp = get_addressed_line_node(from);
- for (; bp != ep; bp = bp->q_forw) {
- if ((s = get_sbuf_line(bp)) == NULL)
- return ERR;
- REALLOC(buf, n, size + bp->len, ERR);
- memcpy(buf + size, s, bp->len);
- size += bp->len;
- }
- REALLOC(buf, n, size + 2, ERR);
- memcpy(buf + size, "\n", 2);
- if (delete_lines(from, to) < 0)
- return ERR;
- current_addr = from - 1;
- SPL1();
- if (put_sbuf_line(buf) == NULL ||
- push_undo_stack(UADD, current_addr, current_addr) == NULL) {
- SPL0();
- return ERR;
- }
- modified = 1;
- SPL0();
- return 0;
- }
- /* move_lines: move a range of lines */
- int
- move_lines(long addr)
- {
- line_t *b1, *a1, *b2, *a2;
- long n = INC_MOD(second_addr, addr_last);
- long p = first_addr - 1;
- int done = (addr == first_addr - 1 || addr == second_addr);
- SPL1();
- if (done) {
- a2 = get_addressed_line_node(n);
- b2 = get_addressed_line_node(p);
- current_addr = second_addr;
- } else if (push_undo_stack(UMOV, p, n) == NULL ||
- push_undo_stack(UMOV, addr, INC_MOD(addr, addr_last)) == NULL) {
- SPL0();
- return ERR;
- } else {
- a1 = get_addressed_line_node(n);
- if (addr < first_addr) {
- b1 = get_addressed_line_node(p);
- b2 = get_addressed_line_node(addr);
- /* this get_addressed_line_node last! */
- } else {
- b2 = get_addressed_line_node(addr);
- b1 = get_addressed_line_node(p);
- /* this get_addressed_line_node last! */
- }
- a2 = b2->q_forw;
- REQUE(b2, b1->q_forw);
- REQUE(a1->q_back, a2);
- REQUE(b1, a1);
- current_addr = addr + ((addr < first_addr) ?
- second_addr - first_addr + 1 : 0);
- }
- if (isglobal)
- unset_active_nodes(b2->q_forw, a2);
- modified = 1;
- SPL0();
- return 0;
- }
- /* copy_lines: copy a range of lines; return status */
- int
- copy_lines(long addr)
- {
- line_t *lp, *np = get_addressed_line_node(first_addr);
- undo_t *up = NULL;
- long n = second_addr - first_addr + 1;
- long m = 0;
- current_addr = addr;
- if (first_addr <= addr && addr < second_addr) {
- n = addr - first_addr + 1;
- m = second_addr - addr;
- }
- for (; n > 0; n=m, m=0, np = get_addressed_line_node(current_addr + 1))
- for (; n-- > 0; np = np->q_forw) {
- SPL1();
- if ((lp = dup_line_node(np)) == NULL) {
- SPL0();
- return ERR;
- }
- add_line_node(lp);
- if (up)
- up->t = lp;
- else if ((up = push_undo_stack(UADD, current_addr,
- current_addr)) == NULL) {
- SPL0();
- return ERR;
- }
- modified = 1;
- SPL0();
- }
- return 0;
- }
- /* delete_lines: delete a range of lines */
- int
- delete_lines(long from, long to)
- {
- line_t *n, *p;
- SPL1();
- if (push_undo_stack(UDEL, from, to) == NULL) {
- SPL0();
- return ERR;
- }
- n = get_addressed_line_node(INC_MOD(to, addr_last));
- p = get_addressed_line_node(from - 1);
- /* this get_addressed_line_node last! */
- if (isglobal)
- unset_active_nodes(p->q_forw, n);
- REQUE(p, n);
- addr_last -= to - from + 1;
- current_addr = from - 1;
- modified = 1;
- SPL0();
- return 0;
- }
- /* display_lines: print a range of lines to stdout */
- int
- display_lines(long from, long to, int gflag)
- {
- line_t *bp;
- line_t *ep;
- char *s;
- if (!from) {
- errmsg = "invalid address";
- return ERR;
- }
- ep = get_addressed_line_node(INC_MOD(to, addr_last));
- bp = get_addressed_line_node(from);
- for (; bp != ep; bp = bp->q_forw) {
- if ((s = get_sbuf_line(bp)) == NULL)
- return ERR;
- if (put_tty_line(s, bp->len, current_addr = from++, gflag) < 0)
- return ERR;
- }
- return 0;
- }
- #define MAXMARK 26 /* max number of marks */
- line_t *mark[MAXMARK]; /* line markers */
- int markno; /* line marker count */
- /* mark_line_node: set a line node mark */
- int
- mark_line_node(line_t *lp, int n)
- {
- if (!islower((unsigned char)n)) {
- errmsg = "invalid mark character";
- return ERR;
- } else if (mark[n - 'a'] == NULL)
- markno++;
- mark[n - 'a'] = lp;
- return 0;
- }
- /* get_marked_node_addr: return address of a marked line */
- long
- get_marked_node_addr(int n)
- {
- if (!islower((unsigned char)n)) {
- errmsg = "invalid mark character";
- return ERR;
- }
- return get_line_node_addr(mark[n - 'a']);
- }
- /* unmark_line_node: clear line node mark */
- void
- unmark_line_node(line_t *lp)
- {
- int i;
- for (i = 0; markno && i < MAXMARK; i++)
- if (mark[i] == lp) {
- mark[i] = NULL;
- markno--;
- }
- }
- /* dup_line_node: return a pointer to a copy of a line node */
- line_t *
- dup_line_node(line_t *lp)
- {
- line_t *np;
- if ((np = (line_t *) malloc(sizeof(line_t))) == NULL) {
- fprintf(stderr, "%s\n", strerror(errno));
- errmsg = "out of memory";
- return NULL;
- }
- np->seek = lp->seek;
- np->len = lp->len;
- return np;
- }
- /* has_trailing_escape: return the parity of escapes preceding a character
- in a string */
- int
- has_trailing_escape(char *s, char *t)
- {
- return (s == t || *(t - 1) != '\\') ? 0 : !has_trailing_escape(s, t - 1);
- }
- /* strip_escapes: return copy of escaped string of at most length PATH_MAX */
- char *
- strip_escapes(char *s)
- {
- static char *file = NULL;
- static int filesz = 0;
- int i = 0;
- REALLOC(file, filesz, PATH_MAX, NULL);
- while (i < filesz - 1 /* Worry about a possible trailing escape */
- && (file[i++] = (*s == '\\') ? *++s : *s))
- s++;
- return file;
- }
- void
- signal_hup(int signo)
- {
- if (mutex)
- sigflags |= (1 << (signo - 1));
- else
- handle_hup(signo);
- }
- void
- signal_int(int signo)
- {
- if (mutex)
- sigflags |= (1 << (signo - 1));
- else
- handle_int(signo);
- }
- void
- handle_hup(int signo)
- {
- char *hup = NULL; /* hup filename */
- char *s;
- char ed_hup[] = "ed.hup";
- int n;
- if (!sigactive)
- quit(1);
- sigflags &= ~(1 << (signo - 1));
- if (addr_last && write_file(ed_hup, "w", 1, addr_last) < 0 &&
- (s = getenv("HOME")) != NULL &&
- (n = strlen(s)) + 8 <= PATH_MAX && /* "ed.hup" + '/' */
- (hup = (char *) malloc(n + 10)) != NULL) {
- strcpy(hup, s);
- if (hup[n - 1] != '/')
- hup[n] = '/', hup[n+1] = '\0';
- strcat(hup, "ed.hup");
- write_file(hup, "w", 1, addr_last);
- }
- quit(2);
- }
- void
- handle_int(int signo)
- {
- if (!sigactive)
- quit(1);
- sigflags &= ~(1 << (signo - 1));
- #ifdef _POSIX_SOURCE
- siglongjmp(env, -1);
- #else
- longjmp(env, -1);
- #endif
- }
- int cols = 72; /* wrap column */
- void
- handle_winch(int signo)
- {
- int save_errno = errno;
- struct winsize ws; /* window size structure */
- sigflags &= ~(1 << (signo - 1));
- if (ioctl(0, TIOCGWINSZ, (char *) &ws) >= 0) {
- if (ws.ws_row > 2) rows = ws.ws_row - 2;
- if (ws.ws_col > 8) cols = ws.ws_col - 8;
- }
- errno = save_errno;
- }
- /* is_legal_filename: return a legal filename */
- int
- is_legal_filename(char *s)
- {
- if (red && (*s == '!' || !strcmp(s, "..") || strchr(s, '/'))) {
- errmsg = "shell access restricted";
- return 0;
- }
- return 1;
- }