/****************************************************************************
* libc/stdio/lib_tempnam.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: tempnam
*
* Description:
* The tempnam() function generates a pathname that may be used for a
* temporary file.
*
* The tempnam() function allows the user to control the choice of a
* directory. The dir argument points to the name of the directory in which
* the file is to be created. If dir is a null pointer or points to a
* string which is not a name for an appropriate directory, the path prefix
* defined as P_tmpdir in the <stdio.h> header will be used. If that
* directory is not accessible, an implementation-defined directory may be
* used.
*
* Many applications prefer their temporary files to have certain initial
* letter sequences in their names. The pfx argument should be used for
* this. This argument may be a null pointer or point to a string of up
* to five bytes to be used as the beginning of the filename.
*
* Returned Value:
* Upon successful completion, tempnam() will allocate space for a string
* put the generated pathname in that space, and return a pointer to it.
* The pointer will be suitable for use in a subsequent call to free().
* Otherwise, it will return a null pointer and set errno to indicate the
* error.
*
* The tempnam() function will fail if:
* ENOMEM - Insufficient storage space is available.
*
****************************************************************************/
FAR char *tempnam(FAR const char *dir, FAR const char *pfx)
{
FAR char *path;
int ret;
(void)asprintf(&path, "%s/%s-XXXXXX.tmp", dir, pfx);
if (path)
{
ret = mktemp(path);
if (ret == OK)
{
return path;
}
free(path);
}
set_errno(ENOMEM);
return NULL;
}
