/* Compile and link with:
 * 
 * gcc -rdynamic -ldl -o dltest dltest.c
 */

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

int foo_11 = 16;
int foo_8  = 19;
int foo_5  = 20;
int foo_14 = 22;
int foo_10 = 32;
int foo_2  = 42;
int foo_6  = 50;
int foo_15 = 51;
int foo_1  = 57;
int foo_3  = 68;
int foo_0  = 76;
int foo_12 = 80;
int foo_4  = 82;
int foo_9  = 84;
int foo_13 = 88;
int foo_7  = 98;


int main(int argc, char **argv) {
    void *dlhand;
    int *foo = NULL; /* Our dynamically loaded stuff */
    int userin = -1;
    char symname[100];

    dlhand = dlopen(NULL, RTLD_LAZY|RTLD_LOCAL);

    if(dlhand == NULL) { /* ack fail */
        fprintf(stderr, "%s\n", dlerror());
        exit(EXIT_FAILURE);
    }

    dlerror(); /* clear error flag */

    while (1) {
        printf("Enter a number between 0 and 15, -1 to quit: ");
        scanf(" %i", &userin);

        if(userin == -1) {
            break;
        }
        else if(userin > 15 || userin < 0) {
            continue;
        }

        snprintf(symname, 100, "foo_%i", userin);

        foo = dlsym(dlhand, symname);
        if(foo == NULL) {
            fprintf(stderr, "%s\n", dlerror());
            exit(EXIT_FAILURE);
        }

        printf("Your magically-obtained result is: %d\n", *foo);
    }

    dlclose(dlhand);
    return 0;
}