Commit ba1a8b64c4

@@ -21,6 +21,7 @@ const assert = std.debug.assert;
 const math = std.math;
 const mem = std.mem;
 const elf = std.elf;
+const unicode = std.unicode;
 const dl = @import("dynamic_library.zig");
 const MAX_PATH_BYTES = std.fs.MAX_PATH_BYTES;
 
@@ -1206,6 +1207,19 @@ pub fn getenvZ(key: [*:0]const u8) ?[]const u8 {
     return getenv(mem.spanZ(key));
 }
 
+fn utf16LeAsciiEqlIgnoreCase(a: []const u16, b: []const u16) bool {
+    if (a.len != b.len) return false;
+    var a_it = unicode.Utf16LeIterator.init(a);
+    var b_it = unicode.Utf16LeIterator.init(b);
+    while (a_it.nextCodepoint() catch return false) |a_codepoint| {
+        const b_codepoint = (b_it.nextCodepoint() catch return false) orelse return false;
+        const upper_a = if (a_codepoint >= 97 and a_codepoint <= 122) a_codepoint & 0b11011111 else a_codepoint;
+        const upper_b = if (b_codepoint >= 97 and b_codepoint <= 122) b_codepoint & 0b11011111 else b_codepoint;
+        if (upper_a != upper_b) return false;
+    }
+    return true;
+}
+
 /// Windows-only. Get an environment variable with a null-terminated, WTF-16 encoded name.
 /// See also `getenv`.
 pub fn getenvW(key: [*:0]const u16) ?[:0]const u16 {
@@ -1227,7 +1241,7 @@ pub fn getenvW(key: [*:0]const u16) ?[:0]const u16 {
         while (ptr[i] != 0) : (i += 1) {}
         const this_value = ptr[value_start..i :0];
 
-        if (mem.eql(u16, key_slice, this_key)) return this_value;
+        if (utf16LeAsciiEqlIgnoreCase(key_slice, this_key)) return this_value;
 
         i += 1; // skip over null byte
     }