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