Add 32bit support.

.travis.yml

@@ -3,9 +3,16 @@ go:
   - 1.4.2
   - 1.5
   - tip
+env:
+  global:
+    - BUILD_GOARCH=amd64
+  matrix:
+    - BUILD_GOOS=linux
+    - BUILD_GOOS=darwin
+    - BUILD_GOOS=windows
 before_install:
   - go get github.com/axw/gocov/gocov
   - go get github.com/mattn/goveralls
   - if ! go get code.google.com/p/go.tools/cmd/cover; then go get golang.org/x/tools/cmd/cover; fi
 script:
-    - $HOME/gopath/bin/goveralls -service=travis-ci
+    - $HOME/gopath/bin/goveralls -service=travis-ci

formatnumber.go

@@ -3,7 +3,6 @@ package accounting
 import (
 	"bytes"
 	"fmt"
-	"math"
 	"math/big"
 	"reflect"
 	"strings"
@@ -87,11 +86,11 @@ func FormatNumberInt(x int, precision int, thousand string, decimal string) stri
 	var result string
 	var minus bool
 
-	if x == math.MinInt64 {
-		return FormatNumber(x, precision, thousand, decimal)
-	}
-
 	if x < 0 {
+		if x*-1 < 0 {
+			return FormatNumber(x, precision, thousand, decimal)
+		}
+
 		minus = true
 		x *= -1
 	}

formatnumber_32bit_test.go

@@ -0,0 +1,13 @@
+// +build 386
+
+package accounting
+
+import (
+	"math"
+	"testing"
+)
+
+func TestFormatNumber32Bit(t *testing.T) {
+	AssertEqual(t, FormatNumber(math.MaxInt32, 10, ",", "."), "2,147,483,647.0000000000")
+	AssertEqual(t, FormatNumber(math.MinInt32, 10, ",", "."), "-2,147,483,648.0000000000")
+}

formatnumber_64bit_test.go

@@ -0,0 +1,19 @@
+// +build amd64
+
+package accounting
+
+import (
+	"math"
+	"testing"
+)
+
+func TestFormatNumber64Bit(t *testing.T) {
+	AssertEqual(t, FormatNumber(math.MaxInt64, 10, ",", "."), "9,223,372,036,854,775,807.0000000000")
+	AssertEqual(t, FormatNumber(math.MinInt64, 10, ",", "."), "-9,223,372,036,854,775,808.0000000000")
+}
+
+func TestFormatNumberInt64Bit(t *testing.T) {
+	AssertEqual(t, FormatNumberInt(math.MaxInt64, 10, ",", "."), "9,223,372,036,854,775,807.0000000000")
+	AssertEqual(t, FormatNumberInt(math.MinInt64+1, 10, ",", "."), "-9,223,372,036,854,775,807.0000000000")
+	AssertEqual(t, FormatNumberInt(math.MinInt64, 10, ",", "."), "-9,223,372,036,854,775,808.0000000000")
+}

formatnumber_test.go

@@ -1,7 +1,6 @@
 package accounting
 
 import (
-	"math"
 	"math/big"
 	"testing"
 )
@@ -14,8 +13,6 @@ func TestFormatNumber(t *testing.T) {
 	AssertEqual(t, FormatNumber(-123.123123, 5, ",", "."), "-123.12312")
 	AssertEqual(t, FormatNumber(-12.123123, 5, ",", "."), "-12.12312")
 	AssertEqual(t, FormatNumber(-1.123123, 5, ",", "."), "-1.12312")
-	AssertEqual(t, FormatNumber(math.MaxInt64, 10, ",", "."), "9,223,372,036,854,775,807.0000000000")
-	AssertEqual(t, FormatNumber(math.MinInt64, 10, ",", "."), "-9,223,372,036,854,775,808.0000000000")
 	AssertEqual(t, FormatNumber(-1, 3, ",", "."), "-1.000")
 	AssertEqual(t, FormatNumber(-10, 3, ",", "."), "-10.000")
 	AssertEqual(t, FormatNumber(-100, 3, ",", "."), "-100.000")
@@ -54,9 +51,6 @@ func TestFormatNumber(t *testing.T) {
 }
 
 func TestFormatNumberInt(t *testing.T) {
-	AssertEqual(t, FormatNumberInt(math.MaxInt64, 10, ",", "."), "9,223,372,036,854,775,807.0000000000")
-	AssertEqual(t, FormatNumberInt(math.MinInt64+1, 10, ",", "."), "-9,223,372,036,854,775,807.0000000000")
-	AssertEqual(t, FormatNumberInt(math.MinInt64, 10, ",", "."), "-9,223,372,036,854,775,808.0000000000")
 	AssertEqual(t, FormatNumberInt(-1, 3, ",", "."), "-1.000")
 	AssertEqual(t, FormatNumberInt(-10, 3, ",", "."), "-10.000")
 	AssertEqual(t, FormatNumberInt(-100, 3, ",", "."), "-100.000")