diff options
author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2012-07-29 14:50:02 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2012-07-29 14:50:02 +0000 |
commit | c28168e6888089662f84f65e848797a2d3f73eed (patch) | |
tree | 77e5f804f4e375eb10fec291862f331f9a20556d /nuttx/lib | |
parent | 16cadcf45159dfa6fa4b57be276cde3c259d83a3 (diff) | |
download | px4-nuttx-c28168e6888089662f84f65e848797a2d3f73eed.tar.gz px4-nuttx-c28168e6888089662f84f65e848797a2d3f73eed.tar.bz2 px4-nuttx-c28168e6888089662f84f65e848797a2d3f73eed.zip |
Add memccpy{}
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4990 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/lib')
-rw-r--r-- | nuttx/lib/string/Make.defs | 2 | ||||
-rw-r--r-- | nuttx/lib/string/lib_memccpy.c | 99 | ||||
-rw-r--r-- | nuttx/lib/string/lib_memcpy.c | 28 |
3 files changed, 116 insertions, 13 deletions
diff --git a/nuttx/lib/string/Make.defs b/nuttx/lib/string/Make.defs index c0a477c53..86fdaba02 100644 --- a/nuttx/lib/string/Make.defs +++ b/nuttx/lib/string/Make.defs @@ -34,7 +34,7 @@ ############################################################################ STRING_SRCS = lib_checkbase.c lib_isbasedigit.c lib_memset.c lib_memchr.c \ - lib_memcpy.c lib_memcmp.c lib_memmove.c lib_skipspace.c \ + lib_memccpy.c lib_memcpy.c lib_memcmp.c lib_memmove.c lib_skipspace.c \ lib_strcasecmp.c lib_strcat.c lib_strchr.c lib_strcpy.c lib_strcmp.c \ lib_strcspn.c lib_strdup.c lib_strerror.c lib_strlen.c lib_strnlen.c \ lib_strncasecmp.c lib_strncat.c lib_strncmp.c lib_strncpy.c \ diff --git a/nuttx/lib/string/lib_memccpy.c b/nuttx/lib/string/lib_memccpy.c new file mode 100644 index 000000000..1f3dbb52d --- /dev/null +++ b/nuttx/lib/string/lib_memccpy.c @@ -0,0 +1,99 @@ +/**************************************************************************** + * lib/string/lib_memccpy.c + * + * Copyright (C) 2012 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. + * + ****************************************************************************/ + +/**************************************************************************** + * Compilation Switches + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <sys/types.h> +#include <string.h> + +/**************************************************************************** + * Global Functions + ****************************************************************************/ + + +/**************************************************************************** + * Name: memccpy + * + * Description: + * The memccpy() function copies bytes from memory area s2 into s1, + * stopping after the first occurrence of byte c (converted to an unsigned + * char) is copied, or after n bytes are copied, whichever comes first. If + * copying takes place between objects that overlap, the behavior is + * undefined. + * + * Returned Value: + * The memccpy() function returns a pointer to the byte after the copy of c + * in s1, or a null pointer if c was not found in the first n bytes of s2. + * + ****************************************************************************/ + +FAR void *memccpy(FAR void *s1, FAR const void *s2, int c, size_t n) +{ + FAR unsigned char *pout = (FAR unsigned char*)s1; + FAR unsigned char *pin = (FAR unsigned char*)s2; + + /* Copy at most n bytes */ + + while (n-- > 0) + { + /* Copy one byte */ + + *pout = *pin++; + + /* Did we just copy the terminating byte c? */ + + if (*pout == (unsigned char)c) + { + /* Yes return a pointer to the byte after the copy of c into s1 */ + + return (FAR void *)pout; + } + + /* No increment to the next destination location */ + + pout++; + } + + /* C was not found in the first n bytes of s2 */ + + return NULL; +} diff --git a/nuttx/lib/string/lib_memcpy.c b/nuttx/lib/string/lib_memcpy.c index 745bafe98..3b62edbab 100644 --- a/nuttx/lib/string/lib_memcpy.c +++ b/nuttx/lib/string/lib_memcpy.c @@ -1,8 +1,8 @@ -/************************************************************ +/**************************************************************************** * lib/string/lib_memcpy.c * * Copyright (C) 2007, 2011 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * 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 @@ -31,29 +31,33 @@ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * - ************************************************************/ + ****************************************************************************/ -/************************************************************ +/**************************************************************************** * Compilation Switches - ************************************************************/ + ****************************************************************************/ -/************************************************************ +/**************************************************************************** * Included Files - ************************************************************/ + ****************************************************************************/ #include <nuttx/config.h> #include <sys/types.h> #include <string.h> -/************************************************************ +/**************************************************************************** * Global Functions - ************************************************************/ + ****************************************************************************/ + +/**************************************************************************** + * Name: memcpy + ****************************************************************************/ #ifndef CONFIG_ARCH_MEMCPY -void *memcpy(void *dest, const void *src, size_t n) +FAR void *memcpy(FAR void *dest, FAR const void *src, size_t n) { - unsigned char *pout = (unsigned char*)dest; - unsigned char *pin = (unsigned char*)src; + FAR unsigned char *pout = (FAR unsigned char*)dest; + FAR unsigned char *pin = (FAR unsigned char*)src; while (n-- > 0) *pout++ = *pin++; return dest; } |