Random string generator.

tag.c

/**
 * tag.c
 *
 * Generates a pseudo-random string of lowercase
 * letters of length TAG_LEN. A specific seed
 * for rand can be passed as an argument.
 */

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

#define TAG_LEN 3

int main(int argc, char *argv[]) {
    static const int a='a', z='z';
    int iseed, i;

    if (argv[1]) iseed = atoi(argv[1]);
    if (!iseed) iseed = (unsigned int)time(NULL);

    srand(iseed);

    for(i=0; i<TAG_LEN; i++) printf("%c", rand() % (z-a+1)+a );

    return EXIT_SUCCESS;
}