gopherjs · lologarithm · Apr 3, 2018 · Apr 4, 2018 · Apr 4, 2018 · Apr 6, 2018
diff --git a/compiler/natives/fs_vfsdata.go b/compiler/natives/fs_vfsdata.go
diff --git a/compiler/natives/src/strconv/atoi.go b/compiler/natives/src/strconv/atoi.go
@@ -0,0 +1,44 @@
+// +build js
+
+package strconv
+
+import (
+	"github.com/gopherjs/gopherjs/js"
+)
+
+const maxInt32 float64 = 1<<31 - 1
+const minInt32 float64 = -1 << 31
+
+// Atoi returns the result of ParseInt(s, 10, 0) converted to type int.
+func Atoi(s string) (int, error) {
+	const fnAtoi = "Atoi"
+	if len(s) == 0 {
+		return 0, syntaxError(fnAtoi, s)
+	}
+	// Investigate the bytes of the string
+	// Validate each byte is allowed in parsing
+	// Number allows some prefixes that Go does not: "0x" "0b", "0o"
+	// additionally Number accepts decimals where Go does not "10.2"
+	for i := 0; i < len(s); i++ {
+		v := s[i]
+
+		if v < '0' || v > '9' {
+			if v != '+' && v != '-' {
+				return 0, syntaxError(fnAtoi, s)
+			}
+		}
+	}
+	jsValue := js.Global.Call("Number", s, 10)
+	if !js.Global.Call("isFinite", jsValue).Bool() {
+		return 0, syntaxError(fnAtoi, s)
+	}
+	// Bounds checking
+	floatval := jsValue.Float()
+	if floatval > maxInt32 {
+		return int(maxInt32), rangeError(fnAtoi, s)
+	} else if floatval < minInt32 {
+		return int(minInt32), rangeError(fnAtoi, s)
+	}
+	// Success!
+	return jsValue.Int(), nil
+}
diff --git a/compiler/natives/src/strconv/itoa.go b/compiler/natives/src/strconv/itoa.go
@@ -0,0 +1,13 @@
+// +build js
+
+package strconv
+
+import (
+	"github.com/gopherjs/gopherjs/js"
+)
+
+// Itoa in gopherjs is always a 32bit int so the native toString
+// always handles it successfully.
+func Itoa(i int) string {
+	return js.InternalObject(i).Call("toString").String()
+}