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/* $Id: compat_mkdtemp.c,v 1.4 2021/09/19 15:02:55 schwarze Exp $ */
/*
* Copyright (c) 2015, 2021 Ingo Schwarze <schwarze@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* The algorithm of this function is inspired by OpenBSD mkdtemp(3)
* by Theo de Raadt and Todd Miller, but the code differs.
*/
#include "config.h"
#include <sys/stat.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
char *
mkdtemp(char *path)
{
char *start, *cp;
unsigned int tries;
start = strchr(path, '\0');
while (start > path && start[-1] == 'X')
start--;
for (tries = INT_MAX; tries; tries--) {
if (mktemp(path) == NULL)
return NULL;
if (mkdir(path, S_IRUSR | S_IWUSR | S_IXUSR) == 0)
return path;
for (cp = start; *cp != '\0'; cp++)
*cp = 'X';
if (errno != EEXIST)
return NULL;
}
errno = EEXIST;
return NULL;
}
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