Update fmt for runes; Add strings.contains_rune

core/strings.odin

@@ -1,22 +1,29 @@
 import "core:mem.odin"
 
 new_string :: proc(s: string) -> string {
-	c := make([]u8, len(s)+1);
-	copy(c, cast([]u8)s);
+	c := make([]byte, len(s)+1);
+	copy(c, cast([]byte)s);
 	c[len(s)] = 0;
 	return string(c[..len(s)]);
 }
 
-new_c_string :: proc(s: string) -> ^u8 {
-	c := make([]u8, len(s)+1);
-	copy(c, cast([]u8)s);
+new_c_string :: proc(s: string) -> ^byte {
+	c := make([]byte, len(s)+1);
+	copy(c, cast([]byte)s);
 	c[len(s)] = 0;
 	return &c[0];
 }
 
-to_odin_string :: proc(str: ^u8) -> string {
+to_odin_string :: proc(str: ^byte) -> string {
 	if str == nil do return "";
 	end := str;
 	for end^ != 0 do end+=1;
 	return string(mem.slice_ptr(str, end-str));
 }
+
+contains_rune :: proc(s: string, r: rune) -> int {
+	for c, offset in s {
+		if c == r do return offset;
+	}
+	return -1;
+}