lib: add ByteToUpper

1 files changed, 9 insertions, 5 deletions

diff --git a/lib/str.go b/lib/str.go
index 8211ea8..8db415f 100644
--- a/lib/str.go
+++ b/lib/str.go
@@ -123,15 +123,19 @@ func StrSplitAt(c byte, s string) []string {
 func StrToUpper(s string) string {
 	us := ""
 	for i := 0; i < len(s); i++ {
-		if 'a' <= s[i] && s[i] <= 'z' {
-			us += string('A' + (s[i] - 'a'))
-		} else {
-			us += string(s[i])
-		}
+		us += string(ByteToUpper(s[i]))
 	}
 	return us
 }
 
+func ByteToUpper(b byte) byte {
+	if 'a' <= b && b <= 'z' {
+		return 'A' + (b - 'a')
+	} else {
+		return b
+	}
+}
+
 // Returns true if string 's' has string 'n' in it.
 func StrHas(s, n string) bool {
 	for i := 0; i < len(s); i++ {