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Annotation of mandoc/compat_mkdtemp.c, Revision 1.1

1.1     ! schwarze    1: #include "config.h"
        !             2:
        !             3: #if HAVE_MKDTEMP
        !             4:
        !             5: int dummy;
        !             6:
        !             7: #else
        !             8:
        !             9: /*     $Id$    */
        !            10: /*
        !            11:  * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
        !            12:  *
        !            13:  * Permission to use, copy, modify, and distribute this software for any
        !            14:  * purpose with or without fee is hereby granted, provided that the above
        !            15:  * copyright notice and this permission notice appear in all copies.
        !            16:  *
        !            17:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
        !            18:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            19:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
        !            20:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            21:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            22:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
        !            23:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            24:  *
        !            25:  * The algorithm of this function is inspired by OpenBSD mkdtemp(3)
        !            26:  * by Theo de Raadt and Todd Miller, but the code differs.
        !            27:  */
        !            28:
        !            29: #include <sys/stat.h>
        !            30: #include <errno.h>
        !            31: #include <limits.h>
        !            32: #include <stdlib.h>
        !            33: #include <string.h>
        !            34:
        !            35: char *
        !            36: mkdtemp(char *path)
        !            37: {
        !            38:        char            *start, *cp;
        !            39:        unsigned         int tries;
        !            40:
        !            41:        start = strchr(path, '\0');
        !            42:        while (start > path && start[-1] == 'X')
        !            43:                start--;
        !            44:
        !            45:        for (tries = INT_MAX; tries; tries--) {
        !            46:                if (mktemp(path) == NULL) {
        !            47:                        errno = EEXIST;
        !            48:                        return(NULL);
        !            49:                }
        !            50:                if (mkdir(path, S_IRUSR | S_IWUSR | S_IXUSR) == 0)
        !            51:                        return(path);
        !            52:                if (errno != EEXIST)
        !            53:                        return(NULL);
        !            54:                for (cp = start; *cp != '\0'; cp++)
        !            55:                        *cp = 'X';
        !            56:        }
        !            57:        errno = EEXIST;
        !            58:        return(NULL);
        !            59: }
        !            60:
        !            61: #endif