Brute Forcing Algo

#include <stdio.h>#include <stdlib.h>#include <string.h>char *charset;int *buffer, len, max;void printchar() {  int i;  for (i = 0; i < len; ++i)    putchar(charset[buf[i]]);  putchar('\n');}int next() {  int i;  for ( i = 0; i < len; ++i)    if (++buffer[i] < max) return 1;    else buffer[i] = 0;  return 0;}int main(int argc, char *argv[]) {  set = argv[1];  max = strlen(charset);  len = atoi(argv[2]);  buf = calloc(len, sizeof(int));   do printchar(); while (next());  return 0;}