/*
 * example.c
 * 
 * gcc example.c -o example -ldl
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>

#include <libusb-1.0/libusb.h>
typedef int (* FDMS1_HW_INIT)(libusb_device_handle *);

int main(int argc, char **argv) {
	char dll_name[128];
	void *dll_handle;
	FDMS1_HW_INIT init;
	
	/* Given a choice made by the user
	 * (in this case a string like 192k from cmd
	 * */
	if (argc != 2) {
		printf("Usage: %s [192k|384k|768k|1536k]\n\n",argv[0]);
		exit(0);
	}
	
	/* some basic check */
	if (strlen(argv[1]) > 5) {
		printf("Invalid parameter\n\n");
		exit(1);
	}
	
	/* Build the so name, for example using sprintf() */
	sprintf(dll_name,"/home/nando/Source/fdm/libfdms1_hw_init_%s.so.1.0", argv[1]);
	
	/* Now load the dll (the dll must be in a sys path or full
	 * path name must be given) */
	
	dll_handle = dlopen(dll_name, RTLD_NOW);
	if (dll_handle == NULL) {
		printf("%s\n\n",dlerror());
		exit(1);
	}
	
	/* get the pointer to the init function
	 * Remember to downcast to the real function pointer because
	 * dlsym returns a generic void*  */
	init = (FDMS1_HW_INIT) dlsym(dll_handle,(const char *)"fdms1_hw_init");
	
	if (init == NULL) {
		printf("Function not found in library\n\n");
	}
	else {
		/* Call the init... but do not expect that works...*/
		libusb_device_handle *usb_handle = NULL;
		init(usb_handle);
	}
	
	/* cleanup */
	dlclose(dll_handle);	
	
}