source: mainline/common/stdc/ctype.c

/*
 * Copyright (c) 2006 Josef Cejka
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup libc
 * @{
 */
/** @file
 */

#include <ctype.h>

int islower(int c)
{
        return ((c >= 'a') && (c <= 'z'));
}

int isupper(int c)
{
        return ((c >= 'A') && (c <= 'Z'));
}

int isalpha(int c)
{
        return (islower(c) || isupper(c));
}

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

int isalnum(int c)
{
        return (isalpha(c) || isdigit(c));
}

int isblank(int c)
{
        return c == ' ' || c == '\t';
}

int iscntrl(int c)
{
        return (c >= 0 && c < 0x20) || c == 0x7E;
}

int isprint(int c)
{
        return c >= 0 && c < 0x80 && !iscntrl(c);
}

int isgraph(int c)
{
        return isprint(c) && c != ' ';
}

int isspace(int c)
{
        switch (c) {
        case ' ':
        case '\n':
        case '\t':
        case '\f':
        case '\r':
        case '\v':
                return 1;
        default:
                return 0;
        }
}

int ispunct(int c)
{
        return !isspace(c) && !isalnum(c) && isprint(c);
}

int isxdigit(int c)
{
        return isdigit(c) ||
            (c >= 'a' && c <= 'f') ||
            (c >= 'A' && c <= 'F');
}

int tolower(int c)
{
        if (isupper(c))
                return (c + ('a' - 'A'));
        else
                return c;
}

int toupper(int c)
{
        if (islower(c))
                return (c + ('A' - 'a'));
        else
                return c;
}

/** @}
 */