881f69699c
patch: Bring in xstrdup and use it when appropriate. The function savestr allows NULL return values during Plan A patching so in case of out of memory conditions, Plan B can step in. In many cases, NULL value is not properly handled, so use xstrdup here (it's outside Plan A/B patching, which means that even Plan B relies on successful operations). Clean up some whitespaces while here Obtained from: OpenBSD
449 lines
9.6 KiB
C
449 lines
9.6 KiB
C
/*-
|
|
* Copyright 1986, Larry Wall
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following condition is met:
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this condition and the following disclaimer.
|
|
*
|
|
* 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.
|
|
*
|
|
* patch - a program to apply diffs to original files
|
|
*
|
|
* -C option added in 1998, original code by Marc Espie, based on FreeBSD
|
|
* behaviour
|
|
*
|
|
* $OpenBSD: util.c,v 1.35 2010/07/24 01:10:12 ray Exp $
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <libgen.h>
|
|
#include <paths.h>
|
|
#include <signal.h>
|
|
#include <stdarg.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "common.h"
|
|
#include "util.h"
|
|
#include "backupfile.h"
|
|
#include "pathnames.h"
|
|
|
|
/* Rename a file, copying it if necessary. */
|
|
|
|
int
|
|
move_file(const char *from, const char *to)
|
|
{
|
|
int fromfd;
|
|
ssize_t i;
|
|
|
|
/* to stdout? */
|
|
|
|
if (strEQ(to, "-")) {
|
|
#ifdef DEBUGGING
|
|
if (debug & 4)
|
|
say("Moving %s to stdout.\n", from);
|
|
#endif
|
|
fromfd = open(from, O_RDONLY);
|
|
if (fromfd < 0)
|
|
pfatal("internal error, can't reopen %s", from);
|
|
while ((i = read(fromfd, buf, buf_size)) > 0)
|
|
if (write(STDOUT_FILENO, buf, i) != i)
|
|
pfatal("write failed");
|
|
close(fromfd);
|
|
return 0;
|
|
}
|
|
if (backup_file(to) < 0) {
|
|
say("Can't backup %s, output is in %s: %s\n", to, from,
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
#ifdef DEBUGGING
|
|
if (debug & 4)
|
|
say("Moving %s to %s.\n", from, to);
|
|
#endif
|
|
if (rename(from, to) < 0) {
|
|
if (errno != EXDEV || copy_file(from, to) < 0) {
|
|
say("Can't create %s, output is in %s: %s\n",
|
|
to, from, strerror(errno));
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Backup the original file. */
|
|
|
|
int
|
|
backup_file(const char *orig)
|
|
{
|
|
struct stat filestat;
|
|
char bakname[MAXPATHLEN], *s, *simplename;
|
|
dev_t orig_device;
|
|
ino_t orig_inode;
|
|
|
|
if (backup_type == none || stat(orig, &filestat) != 0)
|
|
return 0; /* nothing to do */
|
|
/*
|
|
* If the user used zero prefixes or suffixes, then
|
|
* he doesn't want backups. Yet we have to remove
|
|
* orig to break possible hardlinks.
|
|
*/
|
|
if ((origprae && *origprae == 0) || *simple_backup_suffix == 0) {
|
|
unlink(orig);
|
|
return 0;
|
|
}
|
|
orig_device = filestat.st_dev;
|
|
orig_inode = filestat.st_ino;
|
|
|
|
if (origprae) {
|
|
if (strlcpy(bakname, origprae, sizeof(bakname)) >= sizeof(bakname) ||
|
|
strlcat(bakname, orig, sizeof(bakname)) >= sizeof(bakname))
|
|
fatal("filename %s too long for buffer\n", origprae);
|
|
} else {
|
|
if ((s = find_backup_file_name(orig)) == NULL)
|
|
fatal("out of memory\n");
|
|
if (strlcpy(bakname, s, sizeof(bakname)) >= sizeof(bakname))
|
|
fatal("filename %s too long for buffer\n", s);
|
|
free(s);
|
|
}
|
|
|
|
if ((simplename = strrchr(bakname, '/')) != NULL)
|
|
simplename = simplename + 1;
|
|
else
|
|
simplename = bakname;
|
|
|
|
/*
|
|
* Find a backup name that is not the same file. Change the
|
|
* first lowercase char into uppercase; if that isn't
|
|
* sufficient, chop off the first char and try again.
|
|
*/
|
|
while (stat(bakname, &filestat) == 0 &&
|
|
orig_device == filestat.st_dev && orig_inode == filestat.st_ino) {
|
|
/* Skip initial non-lowercase chars. */
|
|
for (s = simplename; *s && !islower((unsigned char)*s); s++)
|
|
;
|
|
if (*s)
|
|
*s = toupper((unsigned char)*s);
|
|
else
|
|
memmove(simplename, simplename + 1,
|
|
strlen(simplename + 1) + 1);
|
|
}
|
|
#ifdef DEBUGGING
|
|
if (debug & 4)
|
|
say("Moving %s to %s.\n", orig, bakname);
|
|
#endif
|
|
if (rename(orig, bakname) < 0) {
|
|
if (errno != EXDEV || copy_file(orig, bakname) < 0)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Copy a file.
|
|
*/
|
|
int
|
|
copy_file(const char *from, const char *to)
|
|
{
|
|
int tofd, fromfd;
|
|
ssize_t i;
|
|
|
|
tofd = open(to, O_CREAT|O_TRUNC|O_WRONLY, 0666);
|
|
if (tofd < 0)
|
|
return -1;
|
|
fromfd = open(from, O_RDONLY, 0);
|
|
if (fromfd < 0)
|
|
pfatal("internal error, can't reopen %s", from);
|
|
while ((i = read(fromfd, buf, buf_size)) > 0)
|
|
if (write(tofd, buf, i) != i)
|
|
pfatal("write to %s failed", to);
|
|
close(fromfd);
|
|
close(tofd);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate a unique area for a string.
|
|
*/
|
|
char *
|
|
savestr(const char *s)
|
|
{
|
|
char *rv;
|
|
|
|
if (!s)
|
|
s = "Oops";
|
|
rv = strdup(s);
|
|
if (rv == NULL) {
|
|
if (using_plan_a)
|
|
out_of_mem = true;
|
|
else
|
|
fatal("out of memory\n");
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
/*
|
|
* Allocate a unique area for a string. Call fatal if out of memory.
|
|
*/
|
|
char *
|
|
xstrdup(const char *s)
|
|
{
|
|
char *rv;
|
|
|
|
if (!s)
|
|
s = "Oops";
|
|
rv = strdup(s);
|
|
if (rv == NULL)
|
|
fatal("out of memory\n");
|
|
return rv;
|
|
}
|
|
|
|
/*
|
|
* Vanilla terminal output (buffered).
|
|
*/
|
|
void
|
|
say(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
vfprintf(stdout, fmt, ap);
|
|
va_end(ap);
|
|
fflush(stdout);
|
|
}
|
|
|
|
/*
|
|
* Terminal output, pun intended.
|
|
*/
|
|
void
|
|
fatal(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
fprintf(stderr, "patch: **** ");
|
|
vfprintf(stderr, fmt, ap);
|
|
va_end(ap);
|
|
my_exit(2);
|
|
}
|
|
|
|
/*
|
|
* Say something from patch, something from the system, then silence . . .
|
|
*/
|
|
void
|
|
pfatal(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int errnum = errno;
|
|
|
|
fprintf(stderr, "patch: **** ");
|
|
va_start(ap, fmt);
|
|
vfprintf(stderr, fmt, ap);
|
|
va_end(ap);
|
|
fprintf(stderr, ": %s\n", strerror(errnum));
|
|
my_exit(2);
|
|
}
|
|
|
|
/*
|
|
* Get a response from the user via /dev/tty
|
|
*/
|
|
void
|
|
ask(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
ssize_t nr = 0;
|
|
static int ttyfd = -1;
|
|
|
|
va_start(ap, fmt);
|
|
vfprintf(stdout, fmt, ap);
|
|
va_end(ap);
|
|
fflush(stdout);
|
|
if (ttyfd < 0)
|
|
ttyfd = open(_PATH_TTY, O_RDONLY);
|
|
if (ttyfd >= 0) {
|
|
if ((nr = read(ttyfd, buf, buf_size)) > 0 &&
|
|
buf[nr - 1] == '\n')
|
|
buf[nr - 1] = '\0';
|
|
}
|
|
if (ttyfd < 0 || nr <= 0) {
|
|
/* no tty or error reading, pretend user entered 'return' */
|
|
putchar('\n');
|
|
buf[0] = '\0';
|
|
}
|
|
}
|
|
|
|
/*
|
|
* How to handle certain events when not in a critical region.
|
|
*/
|
|
void
|
|
set_signals(int reset)
|
|
{
|
|
static sig_t hupval, intval;
|
|
|
|
if (!reset) {
|
|
hupval = signal(SIGHUP, SIG_IGN);
|
|
if (hupval != SIG_IGN)
|
|
hupval = my_exit;
|
|
intval = signal(SIGINT, SIG_IGN);
|
|
if (intval != SIG_IGN)
|
|
intval = my_exit;
|
|
}
|
|
signal(SIGHUP, hupval);
|
|
signal(SIGINT, intval);
|
|
}
|
|
|
|
/*
|
|
* How to handle certain events when in a critical region.
|
|
*/
|
|
void
|
|
ignore_signals(void)
|
|
{
|
|
signal(SIGHUP, SIG_IGN);
|
|
signal(SIGINT, SIG_IGN);
|
|
}
|
|
|
|
/*
|
|
* Make sure we'll have the directories to create a file. If `striplast' is
|
|
* true, ignore the last element of `filename'.
|
|
*/
|
|
|
|
void
|
|
makedirs(const char *filename, bool striplast)
|
|
{
|
|
char *tmpbuf;
|
|
|
|
if ((tmpbuf = strdup(filename)) == NULL)
|
|
fatal("out of memory\n");
|
|
|
|
if (striplast) {
|
|
char *s = strrchr(tmpbuf, '/');
|
|
if (s == NULL) {
|
|
free(tmpbuf);
|
|
return; /* nothing to be done */
|
|
}
|
|
*s = '\0';
|
|
}
|
|
if (mkpath(tmpbuf) != 0)
|
|
pfatal("creation of %s failed", tmpbuf);
|
|
free(tmpbuf);
|
|
}
|
|
|
|
/*
|
|
* Make filenames more reasonable.
|
|
*/
|
|
char *
|
|
fetchname(const char *at, bool *exists, int strip_leading)
|
|
{
|
|
char *fullname, *name, *t;
|
|
int sleading, tab;
|
|
struct stat filestat;
|
|
|
|
if (at == NULL || *at == '\0')
|
|
return NULL;
|
|
while (isspace((unsigned char)*at))
|
|
at++;
|
|
#ifdef DEBUGGING
|
|
if (debug & 128)
|
|
say("fetchname %s %d\n", at, strip_leading);
|
|
#endif
|
|
/* So files can be created by diffing against /dev/null. */
|
|
if (strnEQ(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1))
|
|
return NULL;
|
|
name = fullname = t = savestr(at);
|
|
|
|
tab = strchr(t, '\t') != NULL;
|
|
/* Strip off up to `strip_leading' path components and NUL terminate. */
|
|
for (sleading = strip_leading; *t != '\0' && ((tab && *t != '\t') ||
|
|
!isspace((unsigned char)*t)); t++) {
|
|
if (t[0] == '/' && t[1] != '/' && t[1] != '\0')
|
|
if (--sleading >= 0)
|
|
name = t + 1;
|
|
}
|
|
*t = '\0';
|
|
|
|
/*
|
|
* If no -p option was given (957 is the default value!), we were
|
|
* given a relative pathname, and the leading directories that we
|
|
* just stripped off all exist, put them back on.
|
|
*/
|
|
if (strip_leading == 957 && name != fullname && *fullname != '/') {
|
|
name[-1] = '\0';
|
|
if (stat(fullname, &filestat) == 0 && S_ISDIR(filestat.st_mode)) {
|
|
name[-1] = '/';
|
|
name = fullname;
|
|
}
|
|
}
|
|
name = savestr(name);
|
|
free(fullname);
|
|
|
|
*exists = stat(name, &filestat) == 0;
|
|
return name;
|
|
}
|
|
|
|
/*
|
|
* Takes the name returned by fetchname and looks in RCS/SCCS directories
|
|
* for a checked in version.
|
|
*/
|
|
char *
|
|
checked_in(char *file)
|
|
{
|
|
char *filebase, *filedir, tmpbuf[MAXPATHLEN];
|
|
struct stat filestat;
|
|
|
|
filebase = basename(file);
|
|
filedir = dirname(file);
|
|
|
|
#define try(f, a1, a2, a3) \
|
|
(snprintf(tmpbuf, sizeof tmpbuf, f, a1, a2, a3), stat(tmpbuf, &filestat) == 0)
|
|
|
|
if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
|
|
try("%s/RCS/%s%s", filedir, filebase, "") ||
|
|
try("%s/%s%s", filedir, filebase, RCSSUFFIX) ||
|
|
try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
|
|
try("%s/%s%s", filedir, SCCSPREFIX, filebase))
|
|
return file;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
version(void)
|
|
{
|
|
printf("patch 2.0-12u10 FreeBSD\n");
|
|
my_exit(EXIT_SUCCESS);
|
|
}
|
|
|
|
/*
|
|
* Exit with cleanup.
|
|
*/
|
|
void
|
|
my_exit(int status)
|
|
{
|
|
unlink(TMPINNAME);
|
|
if (!toutkeep)
|
|
unlink(TMPOUTNAME);
|
|
if (!trejkeep)
|
|
unlink(TMPREJNAME);
|
|
unlink(TMPPATNAME);
|
|
exit(status);
|
|
}
|