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'") 51