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64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/* $Id: compat_mkstemps.c,v 1.1 2021/09/19 15:05:39 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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* Parts of the algorithm of this function are inspired by OpenBSD
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* mkdtemp(3) 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 <fcntl.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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int
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mkstemps(char *path, int suffixlen)
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{
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char *start, *end, *cp;
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int fd, tries;
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char backup;
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end = strchr(path, '\0');
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if (suffixlen < 0 || suffixlen > end - path - 6) {
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errno = EINVAL;
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return -1;
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}
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end -= suffixlen;
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for (start = end; start > path; start--)
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if (start[-1] != 'X')
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break;
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backup = *end;
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for (tries = INT_MAX; tries; tries--) {
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*end = '\0';
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cp = mktemp(path);
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*end = backup;
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if (cp == NULL)
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return -1;
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fd = open(path, O_CREAT | O_EXCL | O_RDWR, S_IRUSR | S_IWUSR);
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if (fd != -1)
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return fd;
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for (cp = start; cp < end; cp++)
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*cp = 'X';
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if (errno != EEXIST)
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return -1;
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}
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errno = EEXIST;
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return -1;
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}
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