Add tmpnam() and tempnam()
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Gregory Nutt
parent
787cd466d2
commit
48888ad65b
105
libc/stdio/lib_tempnam.c
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105
libc/stdio/lib_tempnam.c
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/****************************************************************************
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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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95
libc/stdio/lib_tmpnam.c
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95
libc/stdio/lib_tmpnam.c
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@ -0,0 +1,95 @@
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/****************************************************************************
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* libc/stdio/lib_tmpnam.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: tmpnam
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*
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* Description:
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* The tmpnam() function generates a string that is a valid filename and
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* that is not the same as the name of an existing file. The function is
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* potentially capable of generating TMP_MAX different strings, but any or
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* all of them may already be in use by existing files and thus not be
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* suitable return values.
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*
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* The tmpnam() function generates a different string each time it is
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* called from the same process, up to {TMP_MAX} times. If it is called
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* more than {TMP_MAX} times, the behavior is implementation-defined.
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*
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* Returned Value:
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* Upon successful completion, tmpnam() returns a pointer to a string. I
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* no suitable string can be generated, the tmpnam() function will
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* return a null pointer.
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*
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* If the argument s is a null pointer, tmpnam() will leave its result
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* in an internal static object and return a pointer to that object.
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* Subsequent calls to tmpnam() may modify the same object. If the
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* argument s is not a null pointer, it is presumed to point to an
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* array of at least L_tmpnam chars; tmpnam() will write its result in
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* that array and will return the argument as its value.
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*
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****************************************************************************/
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FAR char *tmpnam(FAR char *s)
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{
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static char path[L_tmpnam];
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int ret;
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if (s == NULL)
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{
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s = path;
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}
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(void)snprintf(s, L_tmpnam, "%s/XXXXXX.tmp", P_tmpdir);
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ret = mktemp(s);
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return (ret == OK) ? s : NULL;
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}
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