ctype.h

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#ifndef _CTYPE_H
#define _CTYPE_H

/** @file
 *
 * Character types
 *
 */

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );

/**
 * Check if character is ASCII
 *
 * @v character         Character
 * @ret is_ascii        Character is an ASCII character
 */
static inline int isascii ( int character ) {

        return ( character <= '\x7f' );
}

/**
 * Check if character is a decimal digit
 *
 * @v character         ASCII character
 * @ret is_digit        Character is a decimal digit
 */
static inline int isdigit ( int character ) {

        return ( ( character >= '0' ) && ( character <= '9' ) );
}

/**
 * Check if character is a hexadecimal digit
 *
 * @v character         ASCII character
 * @ret is_xdigit       Character is a hexadecimal digit
 */
static inline int isxdigit ( int character ) {

        return ( ( ( character >= '0' ) && ( character <= '9' ) ) ||
                 ( ( character >= 'A' ) && ( character <= 'F' ) ) ||
                 ( ( character >= 'a' ) && ( character <= 'f' ) ) );
}

/**
 * Check if character is an upper-case letter
 *
 * @v character         ASCII character
 * @ret is_upper        Character is an upper-case letter
 */
static inline int isupper ( int character ) {

        return ( ( character >= 'A' ) && ( character <= 'Z' ) );
}

/**
 * Check if character is a lower-case letter
 *
 * @v character         ASCII character
 * @ret is_lower        Character is a lower-case letter
 */
static inline int islower ( int character ) {

        return ( ( character >= 'a' ) && ( character <= 'z' ) );
}

/**
 * Check if character is alphabetic
 *
 * @v character         ASCII character
 * @ret is_alpha        Character is alphabetic
 */
static inline int isalpha ( int character ) {

        return ( isupper ( character ) || islower ( character ) );
}

/**
 * Check if character is alphanumeric
 *
 * @v character         ASCII character
 * @ret is_alnum        Character is alphanumeric
 */
static inline int isalnum ( int character ) {

        return ( isalpha ( character ) || isdigit ( character ) );
}

/**
 * Check if character is printable
 *
 * @v character         ASCII character
 * @ret is_print        Character is printable
 */
static inline int isprint ( int character ) {

        return ( ( character >= ' ' ) && ( character <= '~' ) );
}

/**
 * Convert character to lower case
 *
 * @v character         Character
 * @v character         Lower-case character
 */
static inline int tolower ( int character ) {

        return ( isupper ( character ) ?
                 ( character - 'A' + 'a' ) : character );
}

/**
 * Convert character to upper case
 *
 * @v character         Character
 * @v character         Upper-case character
 */
static inline int toupper ( int character ) {

        return ( islower ( character ) ?
                 ( character - 'a' + 'A' ) : character );
}

extern int isspace ( int character );

#endif /* _CTYPE_H */