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tempnam.c revision 1.16 
      1 /*	$NetBSD: tempnam.c,v 1.16 2003/01/18 11:29:58 thorpej Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #if defined(LIBC_SCCS) && !defined(lint)
     38 #if 0
     39 static char sccsid[] = "@(#)tempnam.c	8.1 (Berkeley) 6/4/93";
     40 #else
     41 __RCSID("$NetBSD: tempnam.c,v 1.16 2003/01/18 11:29:58 thorpej Exp $");
     42 #endif
     43 #endif /* LIBC_SCCS and not lint */
     44 
     45 #include "namespace.h"
     46 #include <sys/param.h>
     47 #include <errno.h>
     48 #include <stdio.h>
     49 #include <stdlib.h>
     50 #include <string.h>
     51 #include <unistd.h>
     52 #include <paths.h>
     53 #include "reentrant.h"
     54 #include "local.h"
     55 
     56 __warn_references(tempnam,
     57     "warning: tempnam() possibly used unsafely, use mkstemp() or mkdtemp()")
     58 
     59 char *
     60 tempnam(dir, pfx)
     61 	const char *dir, *pfx;
     62 {
     63 	int sverrno;
     64 	char *f, *name;
     65 
     66 	if (!(name = malloc((size_t)MAXPATHLEN)))
     67 		return(NULL);
     68 
     69 	if (!pfx)
     70 		pfx = "tmp.";
     71 
     72 	if ((f = getenv("TMPDIR")) != NULL) {
     73 		(void)snprintf(name, (size_t)MAXPATHLEN, "%s%s%sXXXXXXXXXX", f,
     74 		    *(f + strlen(f) - 1) == '/'? "": "/", pfx);
     75 		if ((f = _mktemp(name)) != NULL)
     76 			return(f);
     77 	}
     78 
     79 	if ((/* LINTED */f = (char *)dir) != NULL) {
     80 		(void)snprintf(name, (size_t)MAXPATHLEN, "%s%s%sXXXXXXXXXX", f,
     81 		    *(f + strlen(f) - 1) == '/'? "": "/", pfx);
     82 		if ((f = _mktemp(name)) != NULL)
     83 			return(f);
     84 	}
     85 
     86 	f = P_tmpdir;
     87 	(void)snprintf(name, (size_t)MAXPATHLEN, "%s%sXXXXXXXXXX", f, pfx);
     88 	if ((f = _mktemp(name)) != NULL)
     89 		return(f);
     90 
     91 	f = _PATH_TMP;
     92 	(void)snprintf(name, (size_t)MAXPATHLEN, "%s%sXXXXXXXXXX", f, pfx);
     93 	if ((f = _mktemp(name)) != NULL)
     94 		return(f);
     95 
     96 	sverrno = errno;
     97 	free(name);
     98 	errno = sverrno;
     99 	return(NULL);
    100 }
    101