[unix-history] / usr / src / lib / libc / locale / ctype.3

.\"	@(#)ctype.3	5.1 (Berkeley) %G%
.\"
.TH CTYPE 3  "25 February 1983"
.AT 3
.SH NAME
isalpha, isupper, islower, isdigit, isalnum, isspace, ispunct, isprint, iscntrl, isascii \- character classification macros
.SH SYNOPSIS
.B #include <ctype.h>
.PP
.B isalpha(c)
.PP
.B . . .
.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 (3S)).
.TP 15n
.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(8) (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, code less than 0200
.SH "SEE ALSO"
ascii(7)
Commit	Line	Data
b54f16c2	1	.\" @(#)ctype.3 5.1 (Berkeley) %G%
ec009048	2	.\"
b54f16c2	3	.TH CTYPE 3 "25 February 1983"
ec009048 KM	4	.AT 3
ec009048 KM	5	.SH NAME
b54f16c2	6	isalpha, isupper, islower, isdigit, isalnum, isspace, ispunct, isprint, iscntrl, isascii \- character classification macros
ec009048 KM	7	.SH SYNOPSIS
	8	.B #include <ctype.h>
	9	.PP
	10	.B isalpha(c)
	11	.PP
	12	.B . . .
	13	.SH DESCRIPTION
	14	These macros classify ASCII-coded integer values
	15	by table lookup.
	16	Each is a predicate returning nonzero for true,
	17	zero for false.
	18	.I Isascii
	19	is defined on all integer values; the rest
	20	are defined only where
	21	.I isascii
	22	is true and on the single non-ASCII value
	23	EOF (see
b54f16c2	24	.IR stdio (3S)).
ec009048 KM	25	.TP 15n
	26	.I isalpha
	27	.I c
	28	is a letter
	29	.TP
	30	.I isupper
	31	.I c
	32	is an upper case letter
	33	.TP
	34	.I islower
	35	.I c
	36	is a lower case letter
	37	.TP
	38	.I isdigit
	39	.I c
	40	is a digit
	41	.TP
	42	.I isalnum
	43	.I c
	44	is an alphanumeric character
	45	.TP
	46	.I isspace
	47	.I c
	48	is a space, tab, carriage return, newline, or formfeed
	49	.TP
	50	.I ispunct
	51	.I c
	52	is a punctuation character (neither control nor alphanumeric)
	53	.TP
	54	.I isprint
	55	.I c
	56	is a printing character, code 040(8) (space) through 0176 (tilde)
	57	.TP
	58	.I iscntrl
	59	.I c
	60	is a delete character (0177) or ordinary control character
	61	(less than 040).
	62	.TP
	63	.I isascii
	64	.I c
	65	is an ASCII character, code less than 0200
	66	.SH "SEE ALSO"
	67	ascii(7)