isalnum

ctype(3avr)                        avr-libc                        ctype(3avr)



NAME
       ctype

SYNOPSIS
   Character classification routines
       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)

   Character convertion routines
       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)

Detailed Description
       These functions perform various operations on characters.

       #include <ctype.h>

Function Documentation
   int isalnum (int __c)
       Checks for an alphanumeric character. It is equivalent to (isalpha(c)
       || isdigit(c)).

   int isalpha (int __c)
       Checks for an alphabetic character. It is equivalent to (isupper(c) ||
       islower(c)).

   int isascii (int __c)
       Checks whether c is a 7-bit unsigned char value that fits into the
       ASCII character set.

   int isblank (int __c)
       Checks for a blank character, that is, a space or a tab.

   int iscntrl (int __c)
       Checks for a control character.

   int isdigit (int __c)
       Checks for a digit (0 through 9).

   int isgraph (int __c)
       Checks for any printable character except space.

   int islower (int __c)
       Checks for a lower-case character.

   int isprint (int __c)
       Checks for any printable character including space.

   int ispunct (int __c)
       Checks for any printable character which is not a space or an
       alphanumeric character.

   int isspace (int __c)
       Checks for white-space characters. For the avr-libc library, these are:
       space, form-feed ('\f'), newline ('\n'), carriage return ('\r'),
       horizontal tab ('\t'), and vertical tab ('\v').

   int isupper (int __c)
       Checks for an uppercase letter.

   int isxdigit (int __c)
       Checks for a hexadecimal digits, i.e. one of 0 1 2 3 4 5 6 7 8 9 a b c
       d e f A B C D E F.

   int toascii (int __c)
       Converts c to a 7-bit unsigned char value that fits into the ASCII
       character set, by clearing the high-order bits.

       Warning:
           Many people will be unhappy if you use this function. This function
           will convert accented letters into random characters.

   int tolower (int __c)
       Converts the letter c to lower case, if possible.

   int toupper (int __c)
       Converts the letter c to upper case, if possible.

Author
       Generated automatically by Doxygen for avr-libc from the source code.



Version 2.0.0                   Sat Feb 16 2019                    ctype(3avr)