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Calculate WTF-8 length before converting instead of converting into an intermediate buffer on the stack

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Michael Pfaff 2025-04-23 10:11:09 -04:00 committed by Alex Rønne Petersen
parent 3ca0f18bfe
commit 53f298cffa
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1 changed files with 4 additions and 6 deletions
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10
lib/std/fs/Dir.zig
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@ -1347,13 +1347,11 @@ pub fn realpathW(self: Dir, pathname: []const u16, out_buffer: []u8) RealPathErr
var wide_buf: [w.PATH_MAX_WIDE]u16 = undefined;
const wide_slice = try w.GetFinalPathNameByHandle(h_file, .{}, &wide_buf);
var big_out_buf: [fs.max_path_bytes]u8 = undefined;
const end_index = std.unicode.wtf16LeToWtf8(&big_out_buf, wide_slice);
if (end_index > out_buffer.len)
const len = std.unicode.calcWtf8Len(wide_slice);
if (len > out_buffer.len)
return error.NameTooLong;
const result = out_buffer[0..end_index];
@memcpy(result, big_out_buf[0..end_index]);
return result;
const end_index = std.unicode.wtf16LeToWtf8(out_buffer, wide_slice);
return out_buffer[0..end_index];
}
pub const RealPathAllocError = RealPathError || Allocator.Error;