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99 lines
3.7 KiB
99 lines
3.7 KiB
/**************************************************************************** |
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* lib/string/lib_memccpy.c |
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* |
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* Copyright (C) 2012 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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* Compilation Switches |
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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 <sys/types.h> |
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#include <string.h> |
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/**************************************************************************** |
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* Global Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: memccpy |
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* |
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* Description: |
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* The memccpy() function copies bytes from memory area s2 into s1, |
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* stopping after the first occurrence of byte c (converted to an unsigned |
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* char) is copied, or after n bytes are copied, whichever comes first. If |
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* copying takes place between objects that overlap, the behavior is |
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* undefined. |
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* |
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* Returned Value: |
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* The memccpy() function returns a pointer to the byte after the copy of c |
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* in s1, or a null pointer if c was not found in the first n bytes of s2. |
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* |
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****************************************************************************/ |
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FAR void *memccpy(FAR void *s1, FAR const void *s2, int c, size_t n) |
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{ |
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FAR unsigned char *pout = (FAR unsigned char*)s1; |
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FAR unsigned char *pin = (FAR unsigned char*)s2; |
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/* Copy at most n bytes */ |
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while (n-- > 0) |
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{ |
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/* Copy one byte */ |
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*pout = *pin++; |
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/* Did we just copy the terminating byte c? */ |
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if (*pout == (unsigned char)c) |
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{ |
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/* Yes return a pointer to the byte after the copy of c into s1 */ |
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return (FAR void *)pout; |
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} |
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/* No increment to the next destination location */ |
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pout++; |
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} |
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/* C was not found in the first n bytes of s2 */ |
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return NULL; |
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}
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