[Bug 46721] New: Two quotes together (in outer quotes) not parsed correctly in argv

https://bugs.winehq.org/show_bug.cgi?id=46721

Bug ID: 46721
           Summary: Two quotes together (in outer quotes) not parsed
                    correctly in argv
           Product: Wine
           Version: 4.2
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: kernel32
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 63693
  --> https://bugs.winehq.org/attachment.cgi?id=63693
kernel32: Allow double quote style escape in argv

In Windows, two quotes together (within outer quotes) represents a
single quote (with the first quote - of the inner quotes - acting as an escape
character).

Thus calling 'CreateProcessA' with four quotes as a parameter (i.e. '""""')
will represent a single quote (i.e. '"'). In wine, this is currently being
treated as two separate sets of quotes and thus results in a empty value.

The attached patch fixes the problem.

This can be tested with the following (just copy and paste):
cat << END > test.c
#include <windows.h>
#include <stdio.h>

int main(int argc, const char *argv[])
{
    PROCESS_INFORMATION processInfo;

STARTUPINFO startupInfo;
    memset(&startupInfo, 0, sizeof startupInfo);
    startupInfo.cb = sizeof startupInfo;

if (!CreateProcessA(
            NULL,
            "printArgs.exe """"",
            0,
            0,
            TRUE,
            0,
            NULL,
            NULL,
            &startupInfo,
            &processInfo)) {
        DWORD dwLastError = GetLastError();
        fprintf(stderr, "failed to execute printArgs.exe (%lu)\n",
                dwLastError);
        return 1;
    }

return 0;
}
END

cat << END > printArgs.c
#include <stdio.h>

int main(int argc, const char *argv[]) {
   for (int i = 0; i < argc; i++)
      printf("%s\n", argv[i]);

return 0;
}
END

x86_64-w64-mingw32-gcc test.c -o test.exe
x86_64-w64-mingw32-gcc printArgs.c -o printArgs.exe

wine64 test