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