#include <stdlib.h>
#include <string.h>

static char alphs[] = {'-', '_', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e',
                       'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
                       'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
                       'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '\0'};

// Generate an id used for messages.
//  Could be less than 16 chars, but thats what fits into the `command` field of `msgbuf_t`.
void get_id(char *id_buf) {
  int alph_size = strlen(alphs) - 1;

  for (int i = 0; i < 16; i++) {
    int random_num;
    do {
      random_num = rand();
    } while (random_num >= (RAND_MAX - RAND_MAX % alph_size));

    random_num %= alph_size;
    id_buf[i] = alphs[random_num];
  }
  id_buf[15] = '\0';
}