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
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