Wine version detector and dll procedure wrapper

wine_version.c

#include <windows.h>
#include <stdio.h>

// FIXME Pass arguments to proc()
#define WRAP_DLL_PROC(_type, _proc, _dll, _default, ...) \
    _type _proc(__VA_ARGS__)                             \
    {                                                    \
        HMODULE dll = GetModuleHandle(_dll);             \
                                                         \
        if (!dll)                                        \
            return _default;                             \
                                                         \
        _type (CDECL *proc)(__VA_ARGS__) =               \
            (void *) GetProcAddress(dll, #_proc);        \
                                                         \
        return (proc) ? proc() : _default;               \
    }

static const char * wine_get_version(void)
{
    HMODULE ntdll = GetModuleHandle("ntdll.dll");

    if (!ntdll)
        return NULL;

    const char * (CDECL *w_g_v)(void) =
        (void *) GetProcAddress(ntdll, "wine_get_version");

    return (w_g_v)? w_g_v() : NULL;
}

WRAP_DLL_PROC(const char *, wine_get_build_id, "ntdll.dll", NULL, void);

int main(int argc, char *argv[])
{
    const char *wine_version  = wine_get_version(),
               *wine_build_id = wine_get_build_id();

    if (wine_version)
        printf("Wine version  : %s\n", wine_version);

    if (wine_build_id)
        printf("Wine build id : %s\n", wine_build_id);

    return 0;
}