stdio/tempnam-fbsd.c

   1 /*
   2  * Copyright (c) 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if defined(LIBC_SCCS) && !defined(lint)
  35 static char sccsid[] = "@(#)tempnam.c   8.1 (Berkeley) 6/4/93";
  36 #endif /* LIBC_SCCS and not lint */
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD: src/lib/libc/stdio/tempnam.c,v 1.10 2002/03/22 21:53:04 obrien Exp $");
  39
  40 #include <sys/param.h>
  41 #include <errno.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46 #include <paths.h>
  47
  48 __warn_references(tempnam,
  49     "warning: tempnam() possibly used unsafely; consider using mkstemp()");
  50
  51 extern char *_mktemp(char *);
  52
  53 char *
  54 tempnam(dir, pfx)
  55         const char *dir, *pfx;
  56 {
  57         int sverrno;
  58         char *f, *name;
  59
  60         if (!(name = malloc(MAXPATHLEN))) {
  61                 return(NULL);
  62         }
  63
  64         if (!pfx)
  65                 pfx = "tmp.";
  66
  67 #if !__DARWIN_UNIX03
  68         if (issetugid() == 0 && (f = getenv("TMPDIR"))) {
  69                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
  70                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
  71                 if ((f = _mktemp(name))) {
  72                         return(f);
  73                 }
  74         }
  75 #endif /* !__DARWIN_UNIX03 */
  76         if ((f = (char *)dir)) {
  77 #if __DARWIN_UNIX03
  78             if (access(dir, W_OK) == 0) {
  79 #endif /* __DARWIN_UNIX03 */
  80                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
  81                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
  82                 if ((f = _mktemp(name))) {
  83                         return(f);
  84                 }
  85 #if __DARWIN_UNIX03
  86             }
  87 #endif /* __DARWIN_UNIX03 */
  88         }
  89
  90         f = P_tmpdir;
  91 #if __DARWIN_UNIX03
  92         if (access(f, W_OK) == 0) {     /* directory accessible? */
  93 #endif /* __DARWIN_UNIX03 */
  94         (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
  95         if ((f = _mktemp(name))) {
  96                 return(f);
  97         }
  98
  99 #if __DARWIN_UNIX03
 100         }
 101         if (issetugid() == 0 && (f = getenv("TMPDIR")) && access(f, W_OK) == 0) {
 102                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
 103                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
 104                 if ((f = _mktemp(name))) {
 105                         return(f);
 106                 }
 107         }
 108 #endif /* __DARWIN_UNIX03 */
 109         f = _PATH_TMP;
 110 #if __DARWIN_UNIX03
 111         if (access(f, W_OK) < 0) {
 112                 f = "./";       /* directory inaccessible */
 113                 if (access(f, W_OK) < 0) {
 114                         return(NULL);
 115                 }
 116         }
 117 #endif /* __DARWIN_UNIX03 */
 118         (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
 119         if ((f = _mktemp(name))) {
 120                 return(f);
 121         }
 122
 123         sverrno = errno;
 124         free(name);
 125         errno = sverrno;
 126         return(NULL);
 127 }