forked from Archive/PX4-Autopilot
94 lines
3.6 KiB
C
94 lines
3.6 KiB
C
/************************************************************************
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* lib/string//lib_strndup.c
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*
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* Copyright (C) 2011 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 <string.h>
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#include "lib_internal.h"
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/************************************************************************
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* Global Functions
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************************************************************************/
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/************************************************************************
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* Name: strndup
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*
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* Description:
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* The strndup() function is equivalent to the strdup() function,
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* duplicating the provided 's' in a new block of memory allocated as
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* if by using malloc(), with the exception being that strndup() copies
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* at most 'size' plus one bytes into the newly allocated memory,
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* terminating the new string with a NUL character. If the length of 's'
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* is larger than 'size', only 'size' bytes will be duplicated. If
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* 'size' is larger than the length of 's', all bytes in s will be
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* copied into the new memory buffer, including the terminating NUL
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* character. The newly created string will always be properly
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* terminated.
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*
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************************************************************************/
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FAR char *strndup(FAR const char *s, size_t size)
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{
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FAR char *news = NULL;
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if (s)
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{
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/* Get the size of the new string = MIN(strlen(s), size) */
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size_t allocsize = strlen(s);
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if (allocsize > size)
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{
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allocsize = size;
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}
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/* Allocate the new string, adding 1 for the NUL terminator */
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news = (FAR char*)lib_malloc(allocsize + 1);
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if (news)
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{
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/* Copy the string into the allocated memory and add a NUL
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* terminator in any case.
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*/
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memcpy(news, s, allocsize);
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news[allocsize] = '\0';
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}
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}
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return news;
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}
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