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author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-10-09 20:46:14 +0000 |
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committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2010-10-09 20:46:14 +0000 |
commit | 6a3c669ed46650edd963f80fa3418c0413a0123b (patch) | |
tree | 23a8888ed3863e13012ee577b44485d48d888f92 | |
parent | 1470c38340ea6ffca85f1b100f2fe1f43919685c (diff) | |
download | px4-nuttx-6a3c669ed46650edd963f80fa3418c0413a0123b.tar.gz px4-nuttx-6a3c669ed46650edd963f80fa3418c0413a0123b.tar.bz2 px4-nuttx-6a3c669ed46650edd963f80fa3418c0413a0123b.zip |
add abs()
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2984 42af7a65-404d-4744-a932-0658087f49c3
-rw-r--r-- | nuttx/include/stdlib.h | 4 | ||||
-rw-r--r-- | nuttx/lib/Makefile | 2 | ||||
-rw-r--r-- | nuttx/lib/lib_abs.c | 54 |
3 files changed, 59 insertions, 1 deletions
diff --git a/nuttx/include/stdlib.h b/nuttx/include/stdlib.h index 19ed91ec4..c30d07ee3 100644 --- a/nuttx/include/stdlib.h +++ b/nuttx/include/stdlib.h @@ -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, diff --git a/nuttx/lib/Makefile b/nuttx/lib/Makefile index 4ca4735c1..b8897d842 100644 --- a/nuttx/lib/Makefile +++ b/nuttx/lib/Makefile @@ -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 diff --git a/nuttx/lib/lib_abs.c b/nuttx/lib/lib_abs.c new file mode 100644 index 000000000..8ef131b87 --- /dev/null +++ b/nuttx/lib/lib_abs.c @@ -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; +} |