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-.TH CTYPE 3
-.SH NAME
-isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph, iscntrl, isascii, toascii, _toupper, _tolower, toupper, tolower \- ASCII character classification
-.SH SYNOPSIS
-.B #include <u.h>
-.br
-.B #include <libc.h>
-.br
-.B #include <ctype.h>
-.PP
-.if t .2C
-.B isalpha(c)
-.PP
-.B isupper(c)
-.PP
-.B islower(c)
-.PP
-.B isdigit(c)
-.PP
-.B isxdigit(c)
-.PP
-.B isalnum(c)
-.PP
-.B isspace(c)
-.PP
-.B ispunct(c)
-.PP
-.B isprint(c)
-.PP
-.B isgraph(c)
-.PP
-.B iscntrl(c)
-.PP
-.B isascii(c)
-.PP
-.B _toupper(c)
-.PP
-.B _tolower(c)
-.PP
-.B toupper(c)
-.PP
-.B tolower(c)
-.PP
-.B toascii(c)
-.if t .1C
-.SH DESCRIPTION
-These macros classify
-.SM ASCII\c
--coded integer values
-by table lookup.
-Each is a predicate returning nonzero for true,
-zero for false.
-.I Isascii
-is defined on all integer values; the rest
-are defined only where
-.I isascii
-is true and on the single non-\c
-.SM ASCII
-value
-.BR EOF ;
-see
-.IR fopen (3).
-.TP "\w'isalnum  'u"
-.I isalpha
-.I c
-is a letter, a\-z or A\-Z
-.TP
-.I isupper
-.I c
-is an upper case letter, A\-Z
-.TP
-.I islower
-.I c
-is a lower case letter, a\-z
-.TP
-.I isdigit
-.I c
-is a digit, 0\-9
-.TP
-.I isxdigit
-.I c
-is a hexadecimal digit, 0\-9 or a\-f or A\-F
-.TP
-.I isalnum
-.I c
-is an alphanumeric character, a\-z or A\-Z or 0\-9
-.TP
-.I isspace
-.I c
-is a space, horizontal tab, newline, vertical tab, formfeed, or carriage return
-(0x20, 0x9, 0xA, 0xB, 0xC, 0xD)
-.TP
-.I ispunct
-.I c
-is a punctuation character
-(one of
-.L
-!"#$%&'()*+,-./:;<=>?@[\e]^_`{|}~\fR)
-.TP
-.I isprint
-.I c
-is a printing character, 0x20 (space)
-through 0x7E (tilde) 
-.TP
-.I isgraph
-.I c
-is a visible printing character, 0x21 (exclamation) through 0x7E
-(tilde)
-.TP
-.I iscntrl
-.I c
-is a delete character, 0x7F,
-or ordinary control character, 0x0 through 0x1F
-.TP
-.I isascii
-.I c
-is an
-.SM ASCII
-character, 0x0 through 0x7F
-.PP
-.I Toascii
-is not a classification macro;
-it converts its argument to
-.SM ASCII
-range by
-.IR and ing
-with 0x7F.
-.PP
-If
-.I c
-is an upper case letter,
-.I tolower
-returns the lower case version of the character;
-otherwise it returns the original character.
-.I Toupper
-is similar, returning the upper case version of a character
-or the original character.
-.I Tolower
-and
-.I toupper
-are functions;
-.I _tolower
-and
-.I _toupper
-are corresponding macros which should only be used when it
-is known that the argument is upper case or lower case, respectively.
-.SH SOURCE
-.TF /usr/local/plan9/src/libc/port/ctype.c
-.TP
-.B /sys/include/ctype.h
-for the macros.
-.TP
-.B /usr/local/plan9/src/libc/port/ctype.c
-for the tables.
-.SH "SEE ALSO
-.IR isalpharune (3)
-.SH BUGS
-These macros are
-.SM ASCII \c
--centric.