struct nls [src]

Alias for std.os.windows.nls

Implementations of functionality related to National Language Support on Windows.

Members

Source

//! Implementations of functionality related to National Language Support //! on Windows. const builtin = @import("builtin"); const std = @import("../../std.zig"); /// This corresponds to the uppercase table within the locale-independent /// l_intl.nls data (found at system32\l_intl.nls). /// - In l_intl.nls, this data starts at offset 0x04. /// - In the PEB, this data starts at index [2] of peb.UnicodeCaseTableData when /// it is casted to `[*]u16`. /// /// Note: This data has not changed since Windows 8.1, and has become out-of-sync with /// the Unicode standard. const uppercase_table = [2544]u16{ 272, 288, 304, 320, 336, 352, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 368, 384, 400, 256, 416, 256, 256, 432, 256, 256, 256, 256, 256, 256, 256, 448, 464, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 256, 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Transforms the UTF-16 code unit in `c` to its uppercased version /// if there is one. Otherwise, returns `c` unmodified. /// /// Note: When this function is referenced, it will need to include /// `uppercase_table.len * 2` bytes of data in the resulting binary /// since it depends on the `uppercase_table` data. When /// targeting Windows, `ntdll.RtlUpcaseUnicodeChar` can be /// used instead to avoid having to include a copy of this data. pub fn upcaseW(c: u16) u16 { if (c < 'a') { return c; } if (c <= 'z') { return c - ('a' - 'A'); } if (c >= 0xC0) { var offset: u16 = 0; offset += @as(u8, @truncate(c >> 8)); offset = uppercase_table[offset]; offset += @as(u4, @truncate(c >> 4)); offset = uppercase_table[offset]; offset += @as(u4, @truncate(c)); offset = uppercase_table[offset]; return c +% offset; } return c; } test "upcaseW matches RtlUpcaseUnicodeChar" { if (builtin.os.tag != .windows) return error.SkipZigTest; var c: u16 = 0; while (true) : (c += 1) { std.testing.expectEqual(std.os.windows.ntdll.RtlUpcaseUnicodeChar(c), upcaseW(c)) catch |err| { std.debug.print("mismatch for codepoint U+{X}\n", .{c}); return err; }; if (c == 0xFFFF) break; } }