ctype.h

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#ifndef _CTYPE_H
#define _CTYPE_H

/** @file
 *
 * Character types
 */

FILE_LICENCE ( GPL2_OR_LATER );

#define isdigit(c)      ((c) >= '0' && (c) <= '9')
#define islower(c)      ((c) >= 'a' && (c) <= 'z')
#define isupper(c)      ((c) >= 'A' && (c) <= 'Z')

static inline unsigned char tolower(unsigned char c)
{
        if (isupper(c))
                c -= 'A'-'a';
        return c;
}

static inline unsigned char toupper(unsigned char c)
{
        if (islower(c))
                c -= 'a'-'A';
        return c;
}

extern int isspace ( int c );

#endif /* _CTYPE_H */