stdio/FreeBSD/tempnam.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         if (!pfx)
  64                 pfx = "tmp.";
  65
  66         if (issetugid() == 0 && (f = getenv("TMPDIR"))) {
  67                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
  68                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
  69                 if ((f = _mktemp(name)))
  70                         return(f);
  71         }
  72
  73         if ((f = (char *)dir)) {
  74                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
  75                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
  76                 if ((f = _mktemp(name)))
  77                         return(f);
  78         }
  79
  80         f = P_tmpdir;
  81         (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
  82         if ((f = _mktemp(name)))
  83                 return(f);
  84
  85         f = _PATH_TMP;
  86         (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
  87         if ((f = _mktemp(name)))
  88                 return(f);
  89
  90         sverrno = errno;
  91         free(name);
  92         errno = sverrno;
  93         return(NULL);
  94 }