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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [strconv/] [fp_test.go] - Blame information for rev 747

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Line No. Rev Author Line
1 747 jeremybenn 
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package strconv_test
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import (
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        "bufio"
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        "fmt"
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        "io"
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        "os"
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        "strconv"
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        "strings"
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        "testing"
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)
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func pow2(i int) float64 {
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        switch {
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        case i < 0:
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                return 1 / pow2(-i)
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        case i == 0:
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                return 1
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        case i == 1:
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                return 2
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        }
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        return pow2(i/2) * pow2(i-i/2)
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}
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// Wrapper around strconv.ParseFloat(x, 64).  Handles dddddp+ddd (binary exponent)
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// itself, passes the rest on to strconv.ParseFloat.
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func myatof64(s string) (f float64, ok bool) {
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        a := strings.SplitN(s, "p", 2)
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        if len(a) == 2 {
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                n, err := strconv.ParseInt(a[0], 10, 64)
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                if err != nil {
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                        return 0, false
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                }
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                e, err1 := strconv.Atoi(a[1])
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                if err1 != nil {
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                        println("bad e", a[1])
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                        return 0, false
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                }
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                v := float64(n)
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                // We expect that v*pow2(e) fits in a float64,
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                // but pow2(e) by itself may not.  Be careful.
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                if e <= -1000 {
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                        v *= pow2(-1000)
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                        e += 1000
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                        for e < 0 {
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                                v /= 2
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                                e++
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                        }
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                        return v, true
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                }
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                if e >= 1000 {
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                        v *= pow2(1000)
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                        e -= 1000
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                        for e > 0 {
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                                v *= 2
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                                e--
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                        }
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                        return v, true
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                }
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                return v * pow2(e), true
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        }
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        f1, err := strconv.ParseFloat(s, 64)
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        if err != nil {
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                return 0, false
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        }
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        return f1, true
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}
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// Wrapper around strconv.ParseFloat(x, 32).  Handles dddddp+ddd (binary exponent)
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// itself, passes the rest on to strconv.ParseFloat.
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func myatof32(s string) (f float32, ok bool) {
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        a := strings.SplitN(s, "p", 2)
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        if len(a) == 2 {
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                n, err := strconv.Atoi(a[0])
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                if err != nil {
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                        println("bad n", a[0])
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                        return 0, false
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                }
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                e, err1 := strconv.Atoi(a[1])
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                if err1 != nil {
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                        println("bad p", a[1])
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                        return 0, false
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                }
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                return float32(float64(n) * pow2(e)), true
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        }
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        f64, err1 := strconv.ParseFloat(s, 32)
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        f1 := float32(f64)
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        if err1 != nil {
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                return 0, false
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        }
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        return f1, true
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}
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func TestFp(t *testing.T) {
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        f, err := os.Open("testfp.txt")
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        if err != nil {
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                t.Fatal("testfp: open testfp.txt:", err)
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        }
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        defer f.Close()
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        b := bufio.NewReader(f)
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        lineno := 0
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        for {
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                line, err2 := b.ReadString('\n')
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                if err2 == io.EOF {
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                        break
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                }
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                if err2 != nil {
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                        t.Fatal("testfp: read testfp.txt: " + err2.Error())
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                }
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                line = line[0 : len(line)-1]
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                lineno++
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                if len(line) == 0 || line[0] == '#' {
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                        continue
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                }
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                a := strings.Split(line, " ")
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                if len(a) != 4 {
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                        t.Error("testfp.txt:", lineno, ": wrong field count")
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                        continue
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                }
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                var s string
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                var v float64
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                switch a[0] {
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                case "float64":
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                        var ok bool
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                        v, ok = myatof64(a[2])
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                        if !ok {
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                                t.Error("testfp.txt:", lineno, ": cannot atof64 ", a[2])
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                                continue
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                        }
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                        s = fmt.Sprintf(a[1], v)
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                case "float32":
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                        v1, ok := myatof32(a[2])
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                        if !ok {
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                                t.Error("testfp.txt:", lineno, ": cannot atof32 ", a[2])
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                                continue
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                        }
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                        s = fmt.Sprintf(a[1], v1)
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                        v = float64(v1)
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                }
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                if s != a[3] {
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                        t.Error("testfp.txt:", lineno, ": ", a[0], " ", a[1], " ", a[2], " (", v, ") ",
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                                "want ", a[3], " got ", s)
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                }
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        }
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}

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