带有 Str 的 Perl6 NativeCall 被编码（'utf16'）得到随机损坏的结果

Question

我正在使用 NativeCall 在 perl6 脚本中映射 GetFullPathName windows API，因此我写了以下内容：

#!perl6
use NativeCall;
constant \WIN32_MAX_PATH = 260;    

#I may use directly $path.IO.absolute()
sub Win32-GetFullPathName(
        Str $lpFileName is encoded('utf16'),
        int32 $nBufferLength, 
        #Str $lpBuffer is encoded('utf16') is rw,
        Blob $lpBuffer is rw,
        Str $lpFilenameIndex is rw)
    returns int32
    is native('kernel32.dll') 
    is symbol('GetFullPathNameW') 
    { * }


my $path = '.';
my $fp-size = Win32-GetFullPathName(
        $path, # $path ~ "[=11=]", # <!-- this hack make it working fine
        WIN32_MAX_PATH, 
        #my Str $fpath = ' ' x WIN32_MAX_PATH;
        my $buffer = buf16.allocate(WIN32_MAX_PATH), 
        Str );
put "[$fp-size] => ", $buffer.decode('utf16').substr(0, $fp-size);

代码随机运行，直到我在 $path 后附加一个 "[=14=]"。

[编辑] 多次调用的结果：

[12] => D:\dev\pa.t

[12] => D:\dev\pa.

[12] => D:\dev\pa.µºƒ

[9] => D:\dev\pa

[9] => D:\dev\pa

还有其他正确的方法吗？

Answer 1

我怀疑 src/strings/utf16.c 中存在 MoarVM 错误，特别是 line 403:

result = MVM_realloc(result, *output_size);

应该是

result = MVM_realloc(result, *output_size + 2);

如果您可以验证这是否解决了您的问题，请随时 file a bug report or even create a pull request。

带有 Str 的 Perl6 NativeCall 被编码（'utf16'）得到随机损坏的结果

Perl6 NativeCall with Str is encoded('utf16') got randomly corrupted result

utf-16

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nativecall