Random integer within given range

uirndrng.c

#include <time.h>

unsigned int uirndrng(unsigned int low, unsigned int high)
{
    static char randomized;

    if (low >= high)
    {
        exit(EXIT_FAILURE);
    }

    if (randomized == 0)
    {
        srand(time(NULL));
        randomized = 1;
    }

    // As suggested by c-faq.com:
    return low + rand() / (RAND_MAX / (high - low + 1) + 1);
}