diff options
Diffstat (limited to 'src/Mini.zig')
| -rw-r--r-- | src/Mini.zig | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/Mini.zig b/src/Mini.zig index ac9a8e85..a6aef15a 100644 --- a/src/Mini.zig +++ b/src/Mini.zig @@ -49,6 +49,7 @@ const Row = struct { const end = modal.nextGrapheme(row.text, row.at); const grapheme = row.text[row.at..end]; row.left = File.graphemeDisplayWidth(grapheme); + // unreachable below: `generate` refuses a source that is no UTF-8 const n = std.unicode.utf8ByteSequenceLength(grapheme[0]) catch unreachable; const cp = std.unicode.utf8Decode(grapheme[0..n]) catch unreachable; const blank = switch (cp) { @@ -108,6 +109,7 @@ fn render(output: ?Result, source: []const u8, styles: []const u8) !usize { if (output) |out| { @memset(out.content[offset..][0..spaces], ' '); @memset(out.colors[offset..][0..spaces], 0); + // unreachable: U+2800 plus a u8 mask is a braille codepoint, always three bytes _ = std.unicode.utf8Encode(@as(u21, 0x2800) + mask, out.content[offset + spaces ..][0..3]) catch unreachable; @memset(out.colors[offset + spaces ..][0..3], color); } @@ -313,3 +315,7 @@ test "Mini publishes only complete snapshots and content replacement drops metad const path = try std.fmt.bufPrint(&path_buf, "{s}/mini.txt", .{dir}); try std.testing.checkAllAllocationFailures(std.testing.allocator, Case.run, .{path}); } + +test "Mini refuses a file that is no UTF-8, before its decoding could panic" { + try std.testing.expectError(error.InvalidUtf8, generate(std.testing.allocator, "ok \xff\xfe bad\n\xc3", "")); +} |