97 lines
3.4 KiB
C
97 lines
3.4 KiB
C
/****************************************************************************
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* libs/libc/stdio/lib_tempnam.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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#include "libc.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 *template;
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FAR char *path;
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int ret;
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ret = asprintf(&template, "%s/%s-XXXXXX", dir, pfx);
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if (ret > 0)
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{
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path = mktemp(template);
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if (path != NULL)
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{
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return path;
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}
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lib_free(template);
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}
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else
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{
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set_errno(ENOMEM);
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}
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return NULL;
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}
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