You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
93 lines
3.6 KiB
93 lines
3.6 KiB
/************************************************************************ |
|
* libc/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; |
|
}
|
|
|