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static const char table[UCHAR_MAX] = { /* ... /* };

int first_not_in_table(const char *str) {
  const char *s = str;
  for (; *s; ++s) {
    if (table[(unsigned)*s] != *s)
      return s - str;
  return -1;
}

static const char table[UCHAR_MAX] = { /* ... /* };

ptrdiff_t first_not_in_table(const char *str) {
  const char *s = str;
  for (; *s; ++s) {
    if (table[(unsigned char)*s] != *s)
      return s - str;
  return -1;
}