V8/usr/man/man3/ctype.3

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.TH CTYPE 3 
.SH NAME
isalpha, isupper, islower, isdigit, isalnum, isspace, ispunct, isprint, iscntrl, isascii \- character classification
.SH SYNOPSIS
.2C
.B #include <ctype.h>
.PP
.B isalpha(c)
.PP
.B isupper(c)
.PP
.B islower(c)
.PP
.B isdigit(c)
.PP
.B isalnum(c)
.PP
.B isspace(c)
.PP
.B ispunct(c)
.PP
.B isprint(c)
.PP
.B iscntrl(c)
.PP
.B isascii(c)
.1C
.SH DESCRIPTION
These macros classify ASCII-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-ASCII value
EOF (see
.IR stdio (3)).
.TP "\w'isalnum  'u"
.I isalpha
.I c
is a letter
.TP
.I isupper
.I c
is an upper case letter
.TP
.I islower 
.I c
is a lower case letter
.TP
.I isdigit
.I c
is a digit
.TP
.I isalnum
.I c
is an alphanumeric character
.TP
.I isspace
.I c
is a space, tab, carriage return, newline, or formfeed
.TP
.I ispunct
.I c
is a punctuation character (neither control nor alphanumeric)
.TP
.I isprint
.I c
is a printing character, code 040 octal (space) through 0176 (tilde)
.TP
.I iscntrl
.I c
is a delete character (0177) or ordinary control character
(less than 040).
.TP
.I isascii
.I c
is an ASCII character, i.e.
.RI 0\(<= c <0200.
.SH "SEE ALSO"
tolower(3), ascii(7)