39 lines
966 B
C
39 lines
966 B
C
/****************************************************************************
|
|
* libs/libc/math/lib_roundf.c
|
|
*
|
|
* This file is a part of NuttX:
|
|
*
|
|
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
|
|
* (C) 2012 Petteri Aimonen <jpa@nx.mail.kapsi.fi>
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
#include <nuttx/compiler.h>
|
|
|
|
#include <math.h>
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
float roundf(float x)
|
|
{
|
|
float f = modff(x, &x);
|
|
if (x <= 0.0f && f <= -0.5f)
|
|
{
|
|
x -= 1.0f;
|
|
}
|
|
|
|
if (x >= 0.0f && f >= 0.5f)
|
|
{
|
|
x += 1.0f;
|
|
}
|
|
|
|
return x;
|
|
}
|