test/testloadso.c

/* Test program to test dynamic loading with the loadso subsystem. 
*/

#include <stdio.h>
#include <stdlib.h>

#include "SDL.h"

typedef int (*fntype)(const char *);

int main(int argc, char *argv[])
{
	int retval = 0;
	int hello = 0;
	const char *libname = NULL;
	const char *symname = NULL;
	void *lib = NULL;
	fntype fn = NULL;

	if (argc != 3) {
		const char *app = argv[0];
		fprintf(stderr, "USAGE: %s <library> <functionname>\n", app);
		fprintf(stderr, "       %s --hello <lib with puts()>\n", app);
		return 1;
	}

	/* Initialize SDL */
	if ( SDL_Init(0) < 0 ) {
		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
		return 2;
	}

	if (strcmp(argv[1], "--hello") == 0) {
		hello = 1;
		libname = argv[2];
		symname = "puts";
	} else {
		libname = argv[1];
		symname = argv[2];
	}

	lib = SDL_LoadObject(libname);
        if (lib == NULL) {
		fprintf(stderr, "SDL_LoadObject('%s') failed: %s\n",
		        libname, SDL_GetError());
		retval = 3;
	} else {
		fn = (fntype) SDL_LoadFunction(lib, symname);
		if (fn == NULL) {
			fprintf(stderr, "SDL_LoadFunction('%s') failed: %s\n",
			        symname, SDL_GetError());
			retval = 4;
		} else {
			printf("Found %s in %s at %p\n", symname, libname, fn);
			if (hello) {
				printf("Calling function...\n");
				fflush(stdout);
				fn("     HELLO, WORLD!\n");
				printf("...apparently, we survived.  :)\n");
				printf("Unloading library...\n");
				fflush(stdout);
			}
		}
		SDL_UnloadObject(lib);
	}
	SDL_Quit();
	return(0);
}