#include <string.h>

// inp - string to tokenize
// delim - delimiter character
// out - buffer to write (must be bigger than len)
// len - max length
// returns pointer to n
// returns -1 in case of error
char* token(char *inp, const char *delims, char *out, int len) {
  int n;
  char *until = strpbrk(inp, delims);
  if (until == NULL || (n = until - inp) >= len)
    return -1;
  memcpy(out, inp, n);
  out[n] = '\0';
  return (until[1] == '\0') ? NULL : until + 1;
}