From 7ac9666b8d9c840dfed8105768becaf5e228f84a Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Mon, 29 Jan 2018 23:28:38 +1100
Subject: src/lstrlib.js: Add binary safe string.lower and string.upper

---
 src/lstrlib.js | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

(limited to 'src')

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;
 };
 
-- 
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