mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-10 07:10:06 +00:00
65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/* Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
#include <ansidecl.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
|
|
/* Generate a unique temporary file name from TEMPLATE.
|
|
The last six characters of TEMPLATE must be "XXXXXX";
|
|
they are replaced with a string that makes the filename unique. */
|
|
char *
|
|
DEFUN(mktemp, (template), char *template)
|
|
{
|
|
static CONST char letters[]
|
|
= "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
|
|
size_t len;
|
|
size_t i;
|
|
|
|
len = strlen (template);
|
|
if (len < 6 || strcmp (&template[len - 6], "XXXXXX"))
|
|
{
|
|
errno = EINVAL;
|
|
return NULL;
|
|
}
|
|
|
|
if (sprintf (&template[len - 5], "%.5u",
|
|
(unsigned int) getpid () % 100000) != 5)
|
|
/* Inconceivable lossage. */
|
|
return NULL;
|
|
|
|
for (i = 0; i < sizeof (letters); ++i)
|
|
{
|
|
struct stat ignored;
|
|
|
|
template[len - 6] = letters[i];
|
|
|
|
if (stat (template, &ignored) < 0 && errno == ENOENT)
|
|
/* The file does not exist. So return this name. */
|
|
return template;
|
|
}
|
|
|
|
/* We return the null string if we can't find a unique file name. */
|
|
template[0] = '\0';
|
|
return template;
|
|
}
|