1 files changed, 31 insertions, 0 deletions
diff --git a/src/pkg/net/textproto/textproto.go b/src/pkg/net/textproto/textproto.go
index ad5840cf7..eb6ced1c5 100644
--- a/src/pkg/net/textproto/textproto.go
+++ b/src/pkg/net/textproto/textproto.go
@@ -121,3 +121,34 @@ func (c *Conn) Cmd(format string, args ...interface{}) (id uint, err error) {
 	}
 	return id, nil
 }
+
+// TrimString returns s without leading and trailing ASCII space.
+func TrimString(s string) string {
+	for len(s) > 0 && isASCIISpace(s[0]) {
+		s = s[1:]
+	}
+	for len(s) > 0 && isASCIISpace(s[len(s)-1]) {
+		s = s[:len(s)-1]
+	}
+	return s
+}
+
+// TrimBytes returns b without leading and trailing ASCII space.
+func TrimBytes(b []byte) []byte {
+	for len(b) > 0 && isASCIISpace(b[0]) {
+		b = b[1:]
+	}
+	for len(b) > 0 && isASCIISpace(b[len(b)-1]) {
+		b = b[:len(b)-1]
+	}
+	return b
+}
+
+func isASCIISpace(b byte) bool {
+	return b == ' ' || b == '\t' || b == '\n' || b == '\r'
+}
+
+func isASCIILetter(b byte) bool {
+	b |= 0x20 // make lower case
+	return 'a' <= b && b <= 'z'
+}