mirror of
https://github.com/mpv-player/mpv
synced 2024-12-27 09:32:40 +00:00
88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/*
|
|
* I/O utility functions
|
|
*
|
|
* This file is part of mpv.
|
|
*
|
|
* mpv is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* mpv is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <sys/types.h>
|
|
#include <limits.h>
|
|
|
|
#include "mpv_talloc.h"
|
|
#include "config.h"
|
|
#include "common/common.h"
|
|
#include "misc/random.h"
|
|
#include "misc/io_utils.h"
|
|
#include "osdep/io.h"
|
|
|
|
int mp_mkostemps(char *template, int suffixlen, int flags)
|
|
{
|
|
size_t len = strlen(template);
|
|
char *t = len >= 6 + suffixlen ? &template[len - (6 + suffixlen)] : NULL;
|
|
if (!t || strncmp(t, "XXXXXX", 6) != 0) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
for (size_t fuckshit = 0; fuckshit < UINT32_MAX; fuckshit++) {
|
|
// Using a random value may make it require fewer iterations (even if
|
|
// not truly random; just a counter would be sufficient).
|
|
size_t fuckmess = mp_rand_next();
|
|
char crap[7] = "";
|
|
snprintf(crap, sizeof(crap), "%06zx", fuckmess);
|
|
memcpy(t, crap, 6);
|
|
|
|
int res = open(template, O_RDWR | O_CREAT | O_EXCL | flags, 0600);
|
|
if (res >= 0 || errno != EEXIST)
|
|
return res;
|
|
}
|
|
|
|
errno = EEXIST;
|
|
return -1;
|
|
}
|
|
|
|
bool mp_save_to_file(const char *filepath, const void *data, size_t size)
|
|
{
|
|
assert(filepath && data && size);
|
|
|
|
bool result = false;
|
|
char *tmp = talloc_asprintf(NULL, "%sXXXXXX", filepath);
|
|
int fd = mp_mkostemps(tmp, 0, O_CLOEXEC);
|
|
if (fd < 0)
|
|
goto done;
|
|
FILE *cache = fdopen(fd, "wb");
|
|
if (!cache) {
|
|
close(fd);
|
|
unlink(tmp);
|
|
goto done;
|
|
}
|
|
size_t written = fwrite(data, size, 1, cache);
|
|
int ret = fclose(cache);
|
|
if (written > 0 && !ret) {
|
|
ret = rename(tmp, filepath);
|
|
result = !ret;
|
|
} else {
|
|
unlink(tmp);
|
|
}
|
|
|
|
done:
|
|
talloc_free(tmp);
|
|
return result;
|
|
}
|