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.Dd $Mdocdate: July 17 2013 $
.Dt CTYPE 3
.Os
.Sh NAME
.Nm ctype
.Nd character classification macros
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn isalpha "int c"
.Ft int
.Fn isupper "int c"
.Ft int
.Fn islower "int c"
.Ft int
.Fn isdigit "int c"
.Ft int
.Fn isxdigit "int c"
.Ft int
.Fn isalnum "int c"
.Ft int
.Fn isspace "int c"
.Ft int
.Fn ispunct "int c"
.Ft int
.Fn isprint "int c"
.Ft int
.Fn isgraph "int c"
.Ft int
.Fn iscntrl "int c"
.Ft int
.Fn isblank "int c"
.Ft int
.Fn isascii "int c"
.Ft int
.Fn toupper "int c"
.Ft int
.Fn tolower "int c"
.Ft int
.Fn toascii "int c"
.Sh DESCRIPTION
The above macros perform character tests and conversions on the integer
.Fa c .
.Pp
See each function's own manual page for more information.
.Sh SEE ALSO
.Xr isalnum 3 ,
.Xr isalpha 3 ,
.Xr isascii 3 ,
.Xr isblank 3 ,
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr isgraph 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isspace 3 ,
.Xr isupper 3 ,
.Xr isxdigit 3 ,
.Xr stdio 3 ,
.Xr toascii 3 ,
.Xr tolower 3 ,
.Xr toupper 3 ,
.Xr ascii 7
.Sh STANDARDS
These functions, with the exception of
.Fn isblank
and
.Fn toascii ,
conform to
.St -ansiC .
.Sh HISTORY
The functions
.Fn isalpha ,
.Fn isupper ,
.Fn islower ,
.Fn isdigit ,
.Fn isalnum ,
.Fn isspace ,
.Fn ispunct , 
.Fn isprint ,
.Fn iscntrl ,
and
.Fn isascii
first appeared in
.At v7 .