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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #if defined(LIBC_SCCS) && !defined(lint)
  31 static char sccsid[] = "@(#)tempnam.c   8.1 (Berkeley) 6/4/93";
  32 #endif /* LIBC_SCCS and not lint */
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD: src/lib/libc/stdio/tempnam.c,v 1.11 2007/01/09 00:28:07 imp Exp $");
  35
  36 #include <sys/param.h>
  37 #include <errno.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42 #include <paths.h>
  43
  44 __warn_references(tempnam,
  45     "warning: tempnam() possibly used unsafely; consider using mkstemp()");
  46
  47 extern char *_mktemp(char *);
  48
  49 char *
  50 tempnam(dir, pfx)
  51         const char *dir, *pfx;
  52 {
  53         int sverrno;
  54         char *f, *name;
  55
  56         if (!(name = malloc(MAXPATHLEN)))
  57                 return(NULL);
  58
  59         if (!pfx)
  60                 pfx = "tmp.";
  61
  62         if (issetugid() == 0 && (f = getenv("TMPDIR"))) {
  63                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
  64                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
  65                 if ((f = _mktemp(name)))
  66                         return(f);
  67         }
  68
  69         if ((f = (char *)dir)) {
  70                 (void)snprintf(name, MAXPATHLEN, "%s%s%sXXXXXX", f,
  71                     *(f + strlen(f) - 1) == '/'? "": "/", pfx);
  72                 if ((f = _mktemp(name)))
  73                         return(f);
  74         }
  75
  76         f = P_tmpdir;
  77         (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
  78         if ((f = _mktemp(name)))
  79                 return(f);
  80
  81         f = _PATH_TMP;
  82         (void)snprintf(name, MAXPATHLEN, "%s%sXXXXXX", f, pfx);
  83         if ((f = _mktemp(name)))
  84                 return(f);
  85
  86         sverrno = errno;
  87         free(name);
  88         errno = sverrno;
  89         return(NULL);
  90 }