uuid.c

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

int small_rand() {
    double d = drand48();
    printf("Generated double: %f\n", d);
    return (int)((uint64_t)d & 0xFFFF);
}

void print_uuid() {
    printf("Generated int: %d\n", small_rand());
    printf("%04x%04x-%04x-%04x-%04x-%04x%04x%04x\n",
        small_rand(), small_rand(),
        small_rand(),
        small_rand() & 0x0FFF | 0x4000,
        small_rand() & 0x0FFF | 0x8000,
        small_rand(), small_rand(), small_rand());
}

int main(int argc, char* argv) {
    int i;
    srand48(time(0));
    printf("%d\n", sizeof(long));
    for(i=0; i<10; i++) {
        print_uuid();
    }
    return 0;
}