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// Copyright 2009-2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package math

// Floor returns the greatest integer value less than or equal to x.
//
// Special cases are:
//      Floor(±0) = ±0
//      Floor(±Inf) = ±Inf
//      Floor(NaN) = NaN

//extern floor
func libc_floor(float64) float64

func Floor(x float64) float64 {
        return libc_floor(x)
}

func floor(x float64) float64 {
        if x == 0 || IsNaN(x) || IsInf(x, 0) {
                return x
        }
        if x < 0 {
                d, fract := Modf(-x)
                if fract != 0.0 {
                        d = d + 1
                }
                return -d
        }
        d, _ := Modf(x)
        return d
}

// Ceil returns the least integer value greater than or equal to x.
//
// Special cases are:
//      Ceil(±0) = ±0
//      Ceil(±Inf) = ±Inf
//      Ceil(NaN) = NaN

//extern ceil
func libc_ceil(float64) float64

func Ceil(x float64) float64 {
        return libc_ceil(x)
}

func ceil(x float64) float64 {
        return -Floor(-x)
}

// Trunc returns the integer value of x.
//
// Special cases are:
//      Trunc(±0) = ±0
//      Trunc(±Inf) = ±Inf
//      Trunc(NaN) = NaN

func Trunc(x float64) float64 {
        return trunc(x)
}

func trunc(x float64) float64 {
        if x == 0 || IsNaN(x) || IsInf(x, 0) {
                return x
        }
        d, _ := Modf(x)
        return d
}