src/firmware/gigaboot/lib/ctype.c

// Copyright 2016 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <ctype.h>

int isdigit(int c) { return (c >= '0') && (c <= '9'); }

int isspace(int c) {
  return (c == ' ') || (c == '\f') || (c == '\n') || (c == '\r') || (c == '\t') || (c == '\v');
}

int tolower(int c) {
  if (c >= 'A' && c <= 'Z') {
    return c + ('a' - 'A');
  }
  return c;
}