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add abs()

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2984 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2010-10-09 20:46:14 +00:00
parent 93426fdbd0
commit b9f328eeef
3 changed files with 59 additions and 1 deletions
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4
include/stdlib.h
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@ -144,6 +144,10 @@ EXTERN FAR void *memalign(size_t, size_t);
EXTERN FAR void *zalloc(size_t);
EXTERN FAR void *calloc(size_t, size_t);
/* Misc */
EXTERN int abs(int i);
/* Sorting */
EXTERN void qsort(void *base, size_t nmemb, size_t size,

2
lib/Makefile
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@ -75,7 +75,7 @@ ifeq ($(CONFIG_LIBC_FLOATINGPOINT),y)
STDIO_SRCS += lib_dtoa.c
endif
STDLIB_SRCS = lib_rand.c lib_qsort.c
STDLIB_SRCS = lib_abs.c lib_rand.c lib_qsort.c
MATH_SRCS = lib_rint.c lib_fixedmath.c lib_b16sin.c lib_b16cos.c

54
lib/lib_abs.c Normal file
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@ -0,0 +1,54 @@
/************************************************************************
* lib/lib_abs.c
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 <stdlib.h>
/************************************************************************
* Global Functions
************************************************************************/
int abs(int i)
{
if (i < 0)
{
i = -i;
}
return i;
}