1 files changed, 75 insertions, 0 deletions
diff --git a/src/lib/strconv/atoi.go b/src/lib/strconv/atoi.go
new file mode 100644
index 0000000000..7f741c3041
--- /dev/null
+++ b/src/lib/strconv/atoi.go
@@ -0,0 +1,75 @@
+// 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
+
+// Convert decimal string to unsigned integer.
+// TODO: Doesn't check for overflow.
+export func atoui64(s string) (i uint64, ok bool) {
+	// empty string bad
+	if len(s) == 0 { 
+		return 0, false
+	}
+
+	// pick off zero
+	if s == "0" {
+		return 0, true
+	}
+	
+	// otherwise, leading zero bad
+	if s[0] == '0' {
+		return 0, false
+	}
+
+	// parse number
+	n := uint64(0);
+	for i := 0; i < len(s); i++ {
+		if s[i] < '0' || s[i] > '9' {
+			return 0, false
+		}
+		n = n*10 + uint64(s[i] - '0')
+	}
+	return n, true
+}
+
+// Convert decimal string to integer.
+// TODO: Doesn't check for overflow.
+export func atoi64(s string) (i int64, ok bool) {
+	// empty string bad
+	if len(s) == 0 {
+		return 0, false
+	}
+
+	// pick off leading sign
+	neg := false;
+	if s[0] == '+' {
+		s = s[1:len(s)]
+	} else if s[0] == '-' {
+		neg = true;
+		s = s[1:len(s)]
+	}
+
+	var un uint64;
+	un, ok = atoui64(s);
+	if !ok {
+		return 0, false
+	}
+	n := int64(un);
+	if neg {
+		n = -n
+	}
+	return n, true
+}
+
+export func atoui(s string) (i uint, ok bool) {
+	ii, okok := atoui64(s);
+	i = uint(ii);
+	return i, okok
+}
+
+export func atoi(s string) (i int, ok bool) {
+	ii, okok := atoi64(s);
+	i = int(ii);
+	return i, okok
+}