RFR: JDK-8292866: Java_sun_awt_shell_Win32ShellFolder2_getLinkLocation check MultiByteToWideChar return value for failures

[Phil Race]

On Thu, 25 Aug 2022 08:02:00 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> https://docs.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-multibytetowidechar
> states about MultiByteToWideChar : "The function returns 0 if it does not succeed" and lists a few failure cases.
> However we miss checking the failure case in Java_sun_awt_shell_Win32ShellFolder2_getLinkLocation , seems we assume the function always works nicely (in most of the JDK coding the return value is checked ).

src/java.desktop/windows/native/libawt/windows/ShellFolder2.cpp line 724:

> 722:         // IShellFolder::ParseDisplayName requires the path name in Unicode.
> 723:         ret = MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, strret.cStr, -1, olePath, MAX_PATH);
> 724:         if (ret == 0) return 0;

if (ret == 0) {
    return NULL;
}

Since (1) We always use parens, (2) the other cases return NULL .. unless you want to also change all those to return 0.

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PR: https://git.openjdk.org/jdk/pull/10015