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#ifndef LAZYLOAD_H
#define LAZYLOAD_H
/* simplify loading of DLL functions */
struct proc_addr {
FARPROC pfunction;
unsigned initialized;
};
/* Declares a function to be loaded dynamically from a DLL. */
#define DECLARE_PROC_ADDR(rettype, function, ...) \
static struct proc_addr proc_addr_##function = { NULL, 0 }; \
rettype (WINAPI *function)(__VA_ARGS__)
/*
* Loads a function from a DLL (once-only).
* Returns non-NULL function pointer on success.
* Returns NULL and sets errno == ENOSYS on failure.
*/
#define INIT_PROC_ADDR(dll, function) \
(function = get_proc_addr(#dll, #function, &proc_addr_##function))
static inline void *get_proc_addr(const char *dll, const char *function, struct proc_addr *proc)
{
/* only do this once */
if (!proc->initialized) {
HANDLE hnd = LoadLibraryExA(dll, NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);
if (hnd)
proc->pfunction = GetProcAddress(hnd, function);
proc->initialized = 1;
}
/* set ENOSYS if DLL or function was not found */
if (!proc->pfunction)
errno = ENOSYS;
return proc->pfunction;
}
#endif
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