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