src/system/libroot/posix/glibc/stdio-common/tempnam.c

   1 /* Copyright (C) 1991,1993,1996-1999,2000 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.
  18 */
  19
  20
  21 #include <stdio_private.h>
  22
  23 #include <limits.h>
  24 #include <string.h>
  25
  26
  27 /**     Generate a unique temporary filename using up to five characters of PFX
  28  *      if it is not NULL.  The directory to put this file in is searched for
  29  *      as follows: First the environment variable "TMPDIR" is checked.
  30  *      If it contains the name of a writable directory, that directory is used.
  31  *      If not and if DIR is not NULL, that value is checked.  If that fails,
  32  *      P_tmpdir is tried and finally "/tmp".  The storage for the filename
  33  *      is allocated by `malloc'.
  34  */
  35
  36 char *
  37 tempnam(const char *dir, const char *prefix)
  38 {
  39         char buffer[NAME_MAX];
  40
  41         if (__path_search(buffer, NAME_MAX, dir, prefix, 1))
  42                 return NULL;
  43
  44         if (__gen_tempname(buffer, __GT_NOCREATE))
  45                 return NULL;
  46
  47         return strdup(buffer);
  48 }
  49
  50 //link_warning(tempnam, "the use of `tempnam' is dangerous, better use `mkstemp'")