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glibc  2.9
tempnam.c
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00001 /* Copyright (C) 1991,1993,1996-2000,2007 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stdio.h>
00020 #include <string.h>
00021 
00022 /* Generate a unique temporary filename using up to five characters of
00023    PFX if it is not NULL.  The directory to put this file in is
00024    searched for as follows: First the environment variable "TMPDIR" is
00025    checked.  If it contains the name of a directory, that directory is
00026    used.  If not and if DIR is not NULL, that value is checked.  If
00027    that fails, P_tmpdir is tried and finally "/tmp".  The storage for
00028    the filename is allocated by `malloc'.  */
00029 char *
00030 tempnam (const char *dir, const char *pfx)
00031 {
00032   char buf[FILENAME_MAX];
00033 
00034   if (__path_search (buf, FILENAME_MAX, dir, pfx, 1))
00035     return NULL;
00036 
00037   if (__gen_tempname (buf, 0, __GT_NOCREATE))
00038     return NULL;
00039 
00040   return __strdup (buf);
00041 }
00042 
00043 link_warning (tempnam,
00044              "the use of `tempnam' is dangerous, better use `mkstemp'")