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-rw-r--r--src/lstrlib.js22
1 files changed, 18 insertions, 4 deletions
diff --git a/src/lstrlib.js b/src/lstrlib.js
index b2c2818..fcaea79 100644
--- a/src/lstrlib.js
+++ b/src/lstrlib.js
@@ -673,15 +673,29 @@ const str_reverse = function(L) {
const str_lower = function(L) {
let s = luaL_checkstring(L, 1);
- // TODO: will fail on invalid UTF-8
- lua_pushstring(L, to_luastring(to_jsstring(s).toLowerCase()));
+ let l = s.length;
+ let r = new Uint8Array(l);
+ for (let i=0; i<l; i++) {
+ let c = s[i];
+ if (isupper(c))
+ c = c | 0x20;
+ r[i] = c;
+ }
+ lua_pushstring(L, r);
return 1;
};
const str_upper = function(L) {
let s = luaL_checkstring(L, 1);
- // TODO: will fail on invalid UTF-8
- lua_pushstring(L, to_luastring(to_jsstring(s).toUpperCase()));
+ let l = s.length;
+ let r = new Uint8Array(l);
+ for (let i=0; i<l; i++) {
+ let c = s[i];
+ if (islower(c))
+ c = c & 0xdf;
+ r[i] = c;
+ }
+ lua_pushstring(L, r);
return 1;
};