| /* $OpenBSD: tempnam.c,v 1.19 2015/08/31 02:53:57 guenther Exp $ */ |
| /* |
| * Copyright (c) 1988, 1993 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
| |
| #include <errno.h> |
| #include <limits.h> |
| #include <paths.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <unistd.h> |
| |
| __warn_references(tempnam, |
| "warning: tempnam() possibly used unsafely; consider using mkstemp()"); |
| |
| char * |
| tempnam(const char *dir, const char *pfx) |
| { |
| int sverrno, len; |
| char *f, *name; |
| |
| if (!(name = malloc(PATH_MAX))) |
| return(NULL); |
| |
| if (!pfx) |
| pfx = "tmp."; |
| |
| if (issetugid() == 0 && (f = getenv("TMPDIR")) && *f != '\0') { |
| len = snprintf(name, PATH_MAX, "%s%s%sXXXXXXXXXX", f, |
| f[strlen(f) - 1] == '/' ? "" : "/", pfx); |
| if (len < 0 || len >= PATH_MAX) { |
| errno = ENAMETOOLONG; |
| goto fail; |
| } |
| if ((f = _mktemp(name))) |
| return(f); |
| } |
| |
| if (dir != NULL) { |
| f = *dir ? (char *)dir : "."; |
| len = snprintf(name, PATH_MAX, "%s%s%sXXXXXXXXXX", f, |
| f[strlen(f) - 1] == '/' ? "" : "/", pfx); |
| if (len < 0 || len >= PATH_MAX) { |
| errno = ENAMETOOLONG; |
| goto fail; |
| } |
| if ((f = _mktemp(name))) |
| return(f); |
| } |
| |
| f = P_tmpdir; |
| len = snprintf(name, PATH_MAX, "%s%sXXXXXXXXX", f, pfx); |
| if (len < 0 || len >= PATH_MAX) { |
| errno = ENAMETOOLONG; |
| goto fail; |
| } |
| if ((f = _mktemp(name))) |
| return(f); |
| |
| f = _PATH_TMP; |
| len = snprintf(name, PATH_MAX, "%s%sXXXXXXXXX", f, pfx); |
| if (len < 0 || len >= PATH_MAX) { |
| errno = ENAMETOOLONG; |
| goto fail; |
| } |
| if ((f = _mktemp(name))) |
| return(f); |
| |
| fail: |
| sverrno = errno; |
| free(name); |
| errno = sverrno; |
| return(NULL); |
| } |