/*
* $OpenBSD: util.c,v 1.32 2006/03/11 19:41:30 otto Exp $
* $DragonFly: src/usr.bin/patch/util.c,v 1.9 2007/09/29 23:11:10 swildner Exp $
* $NetBSD: util.c,v 1.28 2018/06/18 18:33:31 christos Exp $
*/
/*
* patch - a program to apply diffs to original files
*
* 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.
*
* -C option added in 1998, original code by Marc Espie, based on FreeBSD
* behaviour
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.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_len)) > 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_len)) > 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;
}
/*
* Vanilla terminal output (buffered).
*/
void
say(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(stderr, fmt, ap);
va_end(ap);
fflush(stderr);
}
/*
* 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_len)) > 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 version 2.0-12u8-NetBSD\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);
}
void *
pch_realloc(void *ptr, size_t number, size_t size)
{
if (number > SIZE_MAX / size) {
errno = EOVERFLOW;
return NULL;
}
return realloc(ptr, number * size);
}
