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Annotation of mandoc/compat_mkdtemp.c, Revision 1.3

1.3     ! schwarze    1: /* $Id: compat_mkdtemp.c,v 1.2 2015/10/06 18:32:19 schwarze Exp $ */
1.1       schwarze    2: /*
                      3:  * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
                      4:  *
                      5:  * Permission to use, copy, modify, and distribute this software for any
                      6:  * purpose with or without fee is hereby granted, provided that the above
                      7:  * copyright notice and this permission notice appear in all copies.
                      8:  *
                      9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                     10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     16:  *
                     17:  * The algorithm of this function is inspired by OpenBSD mkdtemp(3)
                     18:  * by Theo de Raadt and Todd Miller, but the code differs.
                     19:  */
1.3     ! schwarze   20: #include "config.h"
1.1       schwarze   21:
                     22: #include <sys/stat.h>
                     23: #include <errno.h>
                     24: #include <limits.h>
                     25: #include <stdlib.h>
                     26: #include <string.h>
                     27:
                     28: char *
                     29: mkdtemp(char *path)
                     30: {
                     31:        char            *start, *cp;
                     32:        unsigned         int tries;
                     33:
                     34:        start = strchr(path, '\0');
                     35:        while (start > path && start[-1] == 'X')
                     36:                start--;
                     37:
                     38:        for (tries = INT_MAX; tries; tries--) {
                     39:                if (mktemp(path) == NULL) {
                     40:                        errno = EEXIST;
1.2       schwarze   41:                        return NULL;
1.1       schwarze   42:                }
                     43:                if (mkdir(path, S_IRUSR | S_IWUSR | S_IXUSR) == 0)
1.2       schwarze   44:                        return path;
1.1       schwarze   45:                if (errno != EEXIST)
1.2       schwarze   46:                        return NULL;
1.1       schwarze   47:                for (cp = start; *cp != '\0'; cp++)
                     48:                        *cp = 'X';
                     49:        }
                     50:        errno = EEXIST;
1.2       schwarze   51:        return NULL;
1.1       schwarze   52: }

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