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freebsd-skq/bin/ed/main.c
Ulrich Spörlein 55fa734d20 ed(1): make WARNS=6 clean 
Although argc and argv are never read after the longjmp is complete,
gcc is not clever enough to see that and needlessly warns about it.
So add volatile to silence the compiler.

Approved by:	ed (the co-mentor, not ed(1))
2010-03-04 16:08:01 +00:00

1417 lines
31 KiB
C
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/* 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)) {
fprintf(stderr, garrulous ?
"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)) {
fprintf(stderr, garrulous ?
"script, line %d: %s\n" :
"", lineno, errmsg);
quit(2);
}
break;
case FATAL:
if (!isatty(0))
fprintf(stderr, garrulous ?
"script, line %d: %s\n" : "",
lineno, errmsg);
else
fprintf(stderr, garrulous ? "%s\n" : "",
errmsg);
quit(3);
default:
fputs("?\n", stderr);
if (!isatty(0)) {
fprintf(stderr, garrulous ?
"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;
}
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