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/* $OpenBSD: tempnam.c,v 1.20 2017/11/28 06:55:49 tb 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,
"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);
}
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