tiny random password generator

main.c

#include "sodium.h"
#include <stdlib.h>
#include <errno.h>

#define ENCODING "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"

int main(int argc, char** argv) {
    if (argc != 2) {
        fprintf(stderr, "usage: %s <count>", argv[0]);
        return 1;
    }

    long chars = strtol(argv[1], NULL, 10);

    if (errno != 0) {
        fprintf(stderr, "usage: %s <count>", argv[0]);
        return 1;
    }

    uint32_t index;

    for (short n = 0; n < chars; n++) {
        index = randombytes_uniform((sizeof ENCODING) - 1);

        printf("%c", ENCODING[index]);
    }
}

Makefile

pwgen: main.c
	gcc -lsodium -o $@ $<