1// Copyright 2016 The Fuchsia Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include <ctype.h> 6 7int isdigit(int c) { 8 return (c >= '0') && (c <= '9'); 9} 10 11int isspace(int c) { 12 return (c == ' ') || 13 (c == '\f') || 14 (c == '\n') || 15 (c == '\r') || 16 (c == '\t') || 17 (c == '\v'); 18} 19 20int tolower(int c) { 21 if (c >= 'A' && c <= 'Z') { 22 return c + ('a' - 'A'); 23 } 24 return c; 25} 26 27