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/************************************************************************
* lib/string//lib_strndup.c
*
* Copyright (C) 2011 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 <string.h>
#include "lib_internal.h"
/************************************************************************
* Global Functions
************************************************************************/
/************************************************************************
* Name: strndup
*
* Description:
* The strndup() function is equivalent to the strdup() function,
* duplicating the provided 's' in a new block of memory allocated as
* if by using malloc(), with the exception being that strndup() copies
* at most 'size' plus one bytes into the newly allocated memory,
* terminating the new string with a NUL character. If the length of 's'
* is larger than 'size', only 'size' bytes will be duplicated. If
* 'size' is larger than the length of 's', all bytes in s will be
* copied into the new memory buffer, including the terminating NUL
* character. The newly created string will always be properly
* terminated.
*
************************************************************************/
FAR char *strndup(FAR const char *s, size_t size)
{
FAR char *news = NULL;
if (s)
{
/* Get the size of the new string = MIN(strlen(s), size) */
size_t allocsize = strlen(s);
if (allocsize > size)
{
allocsize = size;
}
/* Allocate the new string, adding 1 for the NUL terminator */
news = (FAR char*)lib_malloc(allocsize + 1);
if (news)
{
/* Copy the string into the allocated memory and add a NUL
* terminator in any case.
*/
memcpy(news, s, allocsize);
news[allocsize] = '\0';
}
}
return news;
}
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