File: [cvsweb.bsd.lv] / mandoc / compat_mkdtemp.c (download)
Revision 1.3, Mon Jun 15 01:37:15 2020 UTC (3 years, 11 months ago) by schwarze
Branch: MAIN
Changes since 1.2: +2 -11 lines
Only compile compat_*.c implementations that are actually needed.
That's cleaner and it is supposed to fix compiler warnings with gcc 10
reported by Wynn Wolf Arbor <wolf at oriole dot systems> on discuss@.
|
/* $Id: compat_mkdtemp.c,v 1.3 2020/06/15 01:37:15 schwarze Exp $ */
/*
* Copyright (c) 2015 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) {
errno = EEXIST;
return NULL;
}
if (mkdir(path, S_IRUSR | S_IWUSR | S_IXUSR) == 0)
return path;
if (errno != EEXIST)
return NULL;
for (cp = start; *cp != '\0'; cp++)
*cp = 'X';
}
errno = EEXIST;
return NULL;
}