stdio/FreeBSD/tmpnam.c

   1 /*-
   2  * Copyright (c) 1990, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Chris Torek.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 static char sccsid[] = "@(#)tmpnam.c    8.3 (Berkeley) 3/28/94";
  35 #endif /* LIBC_SCCS and not lint */
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD: src/lib/libc/stdio/tmpnam.c,v 1.6 2007/01/09 00:28:07 imp Exp $");
  38
  39 #include <sys/types.h>
  40
  41 #include <stdio.h>
  42 #include <unistd.h>
  43 #include <pthread.h>
  44 #include <stdlib.h>
  45
  46 __warn_references(tmpnam,
  47     "warning: tmpnam() possibly used unsafely; consider using mkstemp()");
  48
  49 extern char *_mktemp(char *);
  50
  51 static char *tmpnam_buf = NULL;
  52 static pthread_once_t tmpnam_buf_control = PTHREAD_ONCE_INIT;
  53
  54 static void tmpnam_buf_allocate(void)
  55 {
  56         tmpnam_buf = malloc(L_tmpnam);
  57 }
  58
  59 char *
  60 tmpnam(s)
  61         char *s;
  62 {
  63         static u_long tmpcount;
  64
  65         if (s == NULL) {
  66                 if (pthread_once(&tmpnam_buf_control, tmpnam_buf_allocate)
  67                         || !tmpnam_buf) {
  68                         return NULL;
  69                 }
  70                 s = tmpnam_buf;
  71         }
  72         (void)snprintf(s, L_tmpnam, "%stmp.%lu.XXXXXX", P_tmpdir, tmpcount);
  73         ++tmpcount;
  74         return (_mktemp(s));
  75 }