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 <sys/stat.h>
  42 #include <errno.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include <paths.h>
  48
  49 __warn_references(tempnam,
  50     "warning: tempnam() possibly used unsafely; consider using mkstemp()");
  51
  52 extern char *_mktemp(char *);
  53
  54 char *
  55 tempnam(dir, pfx)
  56         const char *dir, *pfx;
  57 {
  58         int sverrno;
  59         char *f, *name;
  60
  61 #if __DARWIN_UNIX03
  62         struct stat sb;
  63 #endif /* __DARWIN_UNIX03 */
  64         if (!(name = malloc(MAXPATHLEN))) {
  65                 return(NULL);
  66         }
  67
  68         if (!pfx)
  69                 pfx = "tmp.";
  70
  71 #if !__DARWIN_UNIX03
  72         if (issetugid() == 0 && (f = getenv("TMPDIR"))) {
  73                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
  74                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
  75                 if ((f = _mktemp(name))) {
  76                         return(f);
  77                 }
  78         }
  79 #endif /* !__DARWIN_UNIX03 */
  80         if ((f = (char *)dir)) {
  81 #if __DARWIN_UNIX03
  82                 if (!access(dir, W_OK)) {
  83 #endif /* __DARWIN_UNIX03 */
  84                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
  85                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
  86                 if ((f = _mktemp(name))) {
  87                         return(f);
  88                 }
  89 #if __DARWIN_UNIX03
  90         }
  91 #endif /* __DARWIN_UNIX03 */
  92         }
  93
  94         f = P_tmpdir;
  95 #if __DARWIN_UNIX03
  96         if (stat(f, &sb) == 0) {        /* directory accessible? */
  97 #endif /* __DARWIN_UNIX03 */
  98         (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
  99         if ((f = _mktemp(name))) {
 100                 return(f);
 101         }
 102
 103 #if __DARWIN_UNIX03
 104         }
 105 #endif /* __DARWIN_UNIX03 */
 106         f = _PATH_TMP;
 107 #if __DARWIN_UNIX03
 108         if (stat(f, &sb) < 0) {
 109                 f = "./";       /* directory inaccessible */
 110         }
 111 #endif /* __DARWIN_UNIX03 */
 112         (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
 113         if ((f = _mktemp(name))) {
 114                 return(f);
 115         }
 116
 117         sverrno = errno;
 118         free(name);
 119         errno = sverrno;
 120         return(NULL);
 121 }