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tempnam.c revision 1.12 
      1 /*	$NetBSD: tempnam.c,v 1.12 1998/10/13 14:19:21 kleink 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 1.12 1998/10/13 14:19:21 kleink 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 "local.h"
     54 
     55 __warn_references(tempnam,
     56     "warning: tempnam() possibly used unsafely, use mkstemp() or mkdtemp()")
     57 
     58 char *
     59 tempnam(dir, pfx)
     60 	const char *dir, *pfx;
     61 {
     62 	int sverrno;
     63 	char *f, *name;
     64 
     65 	if (!(name = malloc(MAXPATHLEN)))
     66 		return(NULL);
     67 
     68 	if (!pfx)
     69 		pfx = "tmp.";
     70 
     71 	if ((f = getenv("TMPDIR")) != NULL) {
     72 		(void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXXX", f,
     73 		    *(f + strlen(f) - 1) == '/'? "": "/", pfx);
     74 		if ((f = _mktemp(name)) != NULL)
     75 			return(f);
     76 	}
     77 
     78 	if ((f = (char *)dir) != NULL) {
     79 		(void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXXX", f,
     80 		    *(f + strlen(f) - 1) == '/'? "": "/", pfx);
     81 		if ((f = _mktemp(name)) != NULL)
     82 			return(f);
     83 	}
     84 
     85 	f = P_tmpdir;
     86 	(void)snprintf(name, MAXPATHLEN, "%s%sXXXXXXX", f, pfx);
     87 	if ((f = _mktemp(name)) != NULL)
     88 		return(f);
     89 
     90 	f = _PATH_TMP;
     91 	(void)snprintf(name, MAXPATHLEN, "%s%sXXXXXXX", f, pfx);
     92 	if ((f = _mktemp(name)) != NULL)
     93 		return(f);
     94 
     95 	sverrno = errno;
     96 	free(name);
     97 	errno = sverrno;
     98 	return(NULL);
     99 }
    100