FreeBSD/Linux Kernel Cross Reference
sys/sys/ctype.h

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * Copyright (c) 1982, 1988, 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
     * the permission of UNIX System Laboratories, Inc.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _SYS_CTYPE_H_
    #define _SYS_CTYPE_H_
    
    #ifdef _KERNEL
    
    static __inline int
    isspace(int c)
    {
            return (c == ' ' || (c >= '\t' && c <= '\r'));
    }
    
    static __inline int
    isascii(int c)
    {
            return ((c & ~0x7f) == 0);
    }
    
    static __inline int
    isupper(int c)
    {
            return (c >= 'A' && c <= 'Z');
    }
    
    static __inline int
    islower(int c)
    {
            return (c >= 'a' && c <= 'z');
    }
    
    static __inline int
    isalpha(int c)
    {
            return (isupper(c) || islower(c));
    }
    
    static __inline int
    isdigit(int c)
    {
            return (c >= '' && c <= '9');
    }
    
    static __inline int
    isxdigit(int c)
    {
            return (isdigit(c) || (c >= 'A' && c <= 'F') || (c >= 'a' && c <= 'f'));
    }
    
    static __inline int
    isprint(int c)
    {
            return (c >= ' ' && c <= '~');
    }
    
    static __inline int
    toupper(int c)
    {
            return (c - 0x20 * ((c >= 'a') && (c <= 'z')));
    }
    
    static __inline int
    tolower(int c)
   {
           return (c + 0x20 * ((c >= 'A') && (c <= 'Z')));
   }
   
   #endif
   #endif /* !_SYS_CTYPE_H_ */

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