ctype.h

       Generated automatically by Doxygen for AVR-LibC from the source code.

AVR-LibC                                          Version 2.2.1                                    ctype.h(3avr)

       ctype.h

FunctionsCharacterclassificationroutines
       These functions perform character classification. They return true or false status depending whether the
       character passed to the function falls into the function's classification (i.e. isdigit() returns true if
       its argument is any value '0' though '9', inclusive). If the input is not an unsigned char value, all of
       this function return false.

           int isalnum (int __c)
           int isalpha (int __c)
           int isascii (int __c)
           int isblank (int __c)
           int iscntrl (int __c)
           int isdigit (int __c)
           int isgraph (int __c)
           int islower (int __c)
           int isprint (int __c)
           int ispunct (int __c)
           int isspace (int __c)
           int isupper (int __c)
           int isxdigit (int __c)

       Characterconvertionroutines
       This realization permits all possible values of integer argument. The toascii() function clears all
       highest bits. The tolower() and toupper() functions return an input argument as is, if it is not an
       unsigned char value.

           int toascii (int __c)
           int tolower (int __c)
           int toupper (int __c)