urand

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <math.h>

int main (int argc, char **argv) {
    int rfd, i, out_size;
    out_size = 64;
    char random_output[out_size];

    rfd = open("/dev/urandom", O_RDONLY);

    if (rfd < 0) {
        fprintf(stderr, "Could not open /dev/urandom: %m\n");
        goto endofrandom;
    }

    if (read(rfd, random_output, out_size) < 0) {
        fprintf(stderr, "Could not read from /dev/urandom. %m\n");
        goto endofrandom;
    }

    if (argc == 2) {
        if ( !strcmp(argv[1], "-hex") || !strcmp(argv[1], "--hex") )  {
            for ( i = 0; i <= out_size; ++i ) {
                printf("\\x%X", abs(*(random_output +i)));
            }
        } else if ( !strcmp(argv[1], "-dec") || !strcmp(argv[1], "--dec") ) {
            for ( i = 0; i <= out_size; ++i ) {
                printf("\\%d", abs(*(random_output +i)));
            }
        } else if ( !strcmp(argv[1], "-oct") || !strcmp(argv[1], "--oct") ) {
            printf("Future feature\n");
        }

        printf("%c", 10);

    } else {
        printf("Usage: %s: -hex|-dec|-oct\n");
    }
endofrandom:
    close(rfd);
    return 0;
}