#include "proone_util.h"


void proone_rnd_alphanumeric_str (proone_rnd_engine_t *rnd_engine, char *str, const size_t len) {
	static const char SET[] = "qwertyuiopasdfghjklzxcvbnm0123456789";
	size_t i = 0;
	uint32_t n;

	if (len >= 4) {
		for (; i < len / 4 * 4; i += 4) {
			n = proone_rnd_gen_int(rnd_engine);
			str[i + 0] = SET[((uint8_t*)&n)[0] % sizeof(SET)];
			str[i + 1] = SET[((uint8_t*)&n)[1] % sizeof(SET)];
			str[i + 2] = SET[((uint8_t*)&n)[2] % sizeof(SET)];
			str[i + 3] = SET[((uint8_t*)&n)[3] % sizeof(SET)];
		}
	}
	if (i < len) {
		n = proone_rnd_gen_int(rnd_engine);
		for (; i < len; i += 1) {
			str[i] = SET[((uint8_t*)&n)[i % 4] % sizeof(SET)];
		}
	}
}