Imported Upstream version 60upstream/60

1 files changed, 191 insertions, 0 deletions

diff --git a/src/pkg/strconv/atof_test.go b/src/pkg/strconv/atof_test.go
new file mode 100644
index 000000000..0fdd0ea98
--- /dev/null
+++ b/src/pkg/strconv/atof_test.go
@@ -0,0 +1,191 @@
+// Copyright 2009 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 strconv_test
+
+import (
+	"os"
+	"reflect"
+	. "strconv"
+	"testing"
+)
+
+type atofTest struct {
+	in  string
+	out string
+	err os.Error
+}
+
+var atoftests = []atofTest{
+	{"", "0", os.EINVAL},
+	{"1", "1", nil},
+	{"+1", "1", nil},
+	{"1x", "0", os.EINVAL},
+	{"1.1.", "0", os.EINVAL},
+	{"1e23", "1e+23", nil},
+	{"1E23", "1e+23", nil},
+	{"100000000000000000000000", "1e+23", nil},
+	{"1e-100", "1e-100", nil},
+	{"123456700", "1.234567e+08", nil},
+	{"99999999999999974834176", "9.999999999999997e+22", nil},
+	{"100000000000000000000001", "1.0000000000000001e+23", nil},
+	{"100000000000000008388608", "1.0000000000000001e+23", nil},
+	{"100000000000000016777215", "1.0000000000000001e+23", nil},
+	{"100000000000000016777216", "1.0000000000000003e+23", nil},
+	{"-1", "-1", nil},
+	{"-0", "-0", nil},
+	{"1e-20", "1e-20", nil},
+	{"625e-3", "0.625", nil},
+
+	// NaNs
+	{"nan", "NaN", nil},
+	{"NaN", "NaN", nil},
+	{"NAN", "NaN", nil},
+
+	// Infs
+	{"inf", "+Inf", nil},
+	{"-Inf", "-Inf", nil},
+	{"+INF", "+Inf", nil},
+	{"-Infinity", "-Inf", nil},
+	{"+INFINITY", "+Inf", nil},
+	{"Infinity", "+Inf", nil},
+
+	// largest float64
+	{"1.7976931348623157e308", "1.7976931348623157e+308", nil},
+	{"-1.7976931348623157e308", "-1.7976931348623157e+308", nil},
+	// next float64 - too large
+	{"1.7976931348623159e308", "+Inf", os.ERANGE},
+	{"-1.7976931348623159e308", "-Inf", os.ERANGE},
+	// the border is ...158079
+	// borderline - okay
+	{"1.7976931348623158e308", "1.7976931348623157e+308", nil},
+	{"-1.7976931348623158e308", "-1.7976931348623157e+308", nil},
+	// borderline - too large
+	{"1.797693134862315808e308", "+Inf", os.ERANGE},
+	{"-1.797693134862315808e308", "-Inf", os.ERANGE},
+
+	// a little too large
+	{"1e308", "1e+308", nil},
+	{"2e308", "+Inf", os.ERANGE},
+	{"1e309", "+Inf", os.ERANGE},
+
+	// way too large
+	{"1e310", "+Inf", os.ERANGE},
+	{"-1e310", "-Inf", os.ERANGE},
+	{"1e400", "+Inf", os.ERANGE},
+	{"-1e400", "-Inf", os.ERANGE},
+	{"1e400000", "+Inf", os.ERANGE},
+	{"-1e400000", "-Inf", os.ERANGE},
+
+	// denormalized
+	{"1e-305", "1e-305", nil},
+	{"1e-306", "1e-306", nil},
+	{"1e-307", "1e-307", nil},
+	{"1e-308", "1e-308", nil},
+	{"1e-309", "1e-309", nil},
+	{"1e-310", "1e-310", nil},
+	{"1e-322", "1e-322", nil},
+	// smallest denormal
+	{"5e-324", "5e-324", nil},
+	{"4e-324", "5e-324", nil},
+	{"3e-324", "5e-324", nil},
+	// too small
+	{"2e-324", "0", nil},
+	// way too small
+	{"1e-350", "0", nil},
+	{"1e-400000", "0", nil},
+
+	// try to overflow exponent
+	{"1e-4294967296", "0", nil},
+	{"1e+4294967296", "+Inf", os.ERANGE},
+	{"1e-18446744073709551616", "0", nil},
+	{"1e+18446744073709551616", "+Inf", os.ERANGE},
+
+	// Parse errors
+	{"1e", "0", os.EINVAL},
+	{"1e-", "0", os.EINVAL},
+	{".e-1", "0", os.EINVAL},
+
+	// http://www.exploringbinary.com/java-hangs-when-converting-2-2250738585072012e-308/
+	{"2.2250738585072012e-308", "2.2250738585072014e-308", nil},
+	// http://www.exploringbinary.com/php-hangs-on-numeric-value-2-2250738585072011e-308/
+	{"2.2250738585072011e-308", "2.225073858507201e-308", nil},
+}
+
+func init() {
+	// The atof routines return NumErrors wrapping
+	// the error and the string.  Convert the table above.
+	for i := range atoftests {
+		test := &atoftests[i]
+		if test.err != nil {
+			test.err = &NumError{test.in, test.err}
+		}
+	}
+}
+
+func testAtof(t *testing.T, opt bool) {
+	oldopt := SetOptimize(opt)
+	for i := 0; i < len(atoftests); i++ {
+		test := &atoftests[i]
+		out, err := Atof64(test.in)
+		outs := Ftoa64(out, 'g', -1)
+		if outs != test.out || !reflect.DeepEqual(err, test.err) {
+			t.Errorf("Atof64(%v) = %v, %v want %v, %v",
+				test.in, out, err, test.out, test.err)
+		}
+
+		out, err = AtofN(test.in, 64)
+		outs = FtoaN(out, 'g', -1, 64)
+		if outs != test.out || !reflect.DeepEqual(err, test.err) {
+			t.Errorf("AtofN(%v, 64) = %v, %v want %v, %v",
+				test.in, out, err, test.out, test.err)
+		}
+
+		if float64(float32(out)) == out {
+			out32, err := Atof32(test.in)
+			outs := Ftoa32(out32, 'g', -1)
+			if outs != test.out || !reflect.DeepEqual(err, test.err) {
+				t.Errorf("Atof32(%v) = %v, %v want %v, %v  # %v",
+					test.in, out32, err, test.out, test.err, out)
+			}
+
+			out, err := AtofN(test.in, 32)
+			out32 = float32(out)
+			outs = FtoaN(float64(out32), 'g', -1, 32)
+			if outs != test.out || !reflect.DeepEqual(err, test.err) {
+				t.Errorf("AtofN(%v, 32) = %v, %v want %v, %v  # %v",
+					test.in, out32, err, test.out, test.err, out)
+			}
+		}
+	}
+	SetOptimize(oldopt)
+}
+
+func TestAtof(t *testing.T) { testAtof(t, true) }
+
+func TestAtofSlow(t *testing.T) { testAtof(t, false) }
+
+func BenchmarkAtof64Decimal(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		Atof64("33909")
+	}
+}
+
+func BenchmarkAtof64Float(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		Atof64("339.7784")
+	}
+}
+
+func BenchmarkAtof64FloatExp(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		Atof64("-5.09e75")
+	}
+}
+
+func BenchmarkAtof64Big(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		Atof64("123456789123456789123456789")
+	}
+}