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