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Add support for div() to the C library. From OrbitalFox

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This commit is contained in:
Stavros Polymenis 2015-08-14 08:35:01 -06:00 committed by Gregory Nutt
parent dd7ffa481c
commit 301f215638
4 changed files with 101 additions and 5 deletions
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2
Documentation

@ -1 +1 @@
Subproject commit 8cc114a79fd2b9b61aa4dd6185feafd9b4acf805
Subproject commit ce750c0899c2138b37b52a48d020a3eceb92fd04

20
include/stdlib.h
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@ -1,7 +1,7 @@
/****************************************************************************
* include/stdlib.h
*
* Copyright (C) 2007-2014 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2015 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -95,6 +95,16 @@ struct mallinfo
* by free (not in use) chunks.*/
};
/* Structure type returned by the div() function. */
struct div_s
{
int quot; /* Quotient */
int rem; /* Remainder */
};
typedef struct div_s div_t;
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
@ -170,13 +180,19 @@ FAR void *memalign(size_t, size_t);
FAR void *zalloc(size_t);
FAR void *calloc(size_t, size_t);
/* Misc */
/* Arithmetic */
int abs(int j);
#ifdef CONFIG_CAN_PASS_STRUCTS
div_t div(int numer, int denom);
#endif
long int labs(long int j);
#ifdef CONFIG_HAVE_LONG_LONG
long long int llabs(long long int j);
#endif
/* Temporary files */
int mktemp(FAR char *path_template);
int mkstemp(FAR char *path_template);

4
libc/stdlib/Make.defs
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@ -1,7 +1,7 @@
############################################################################
# libc/stdlib/Make.defs
#
# Copyright (C) 2012 Gregory Nutt. All rights reserved.
# Copyright (C) 2012, 2015 Gregory Nutt. All rights reserved.
# Author: Gregory Nutt <gnutt@nuttx.org>
#
# Redistribution and use in source and binary forms, with or without
@ -35,7 +35,7 @@
# Add the stdlib C files to the build
CSRCS += lib_abs.c lib_abort.c lib_imaxabs.c lib_itoa.c lib_labs.c
CSRCS += lib_abs.c lib_abort.c lib_div.c lib_imaxabs.c lib_itoa.c lib_labs.c
CSRCS += lib_llabs.c lib_rand.c lib_qsort.c
CSRCS += lib_strtol.c lib_strtoll.c lib_strtoul.c lib_strtoull.c
CSRCS += lib_strtod.c lib_checkbase.c

80
libc/stdlib/lib_div.c Normal file
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@ -0,0 +1,80 @@
/****************************************************************************
* libc/stdlib/lib_div.c
*
* Copyright (C) 2015 Stavros Polymenis. All rights reserved.
* Author: Stavros Polymenis <sp@orbitalfox.com>
*
* 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 <nuttx/compiler.h>
#include <stdlib.h>
#ifdef CONFIG_CAN_PASS_STRUCTS
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: div
*
* Description:
* The div() function computes the quotient and remainder of the division
* of the numerator 'numer' by the denominator 'denom". If the division is
* inexact, the resulting quotient is the integer of lesser magnitude that
* is the nearest to the algebraic quotient. If the result cannot be
* represented, the behavior is undefined; otherwise, quot * denom + rem
* will equal 'numer'.
*
* Input Parameters:
* numer - Numerator of the Division
* denom - Denominator of the division
*
* Returned Value:
* The result of the devision represent as values of type div_t
*
****************************************************************************/
div_t div(int numer, int denom)
{
div_t f;
f.quot = numer / denom;
f.rem = numer % denom;
return f;
}
#endif /* CONFIG_CAN_PASS_STRUCTS */