[unix-history] / usr / man / man3 / ctype.3

.TH CTYPE 3 
.SH NAME
isalpha, isupper, islower, isdigit, isalnum, isspace, ispunct, 
isprint, iscntrl, isascii \-
character classification
.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 (3)).
.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
9aa02762 DR	1	.TH CTYPE 3
	2	.SH NAME
	3	isalpha, isupper, islower, isdigit, isalnum, isspace, ispunct,
	4	isprint, iscntrl, isascii \-
	5	character classification
	6	.SH SYNOPSIS
	7	.B #include <ctype.h>
	8	.PP
	9	.B isalpha(c)
	10	.PP
	11	.B . . .
	12	.SH DESCRIPTION
	13	These macros classify ASCII-coded integer values
	14	by table lookup.
	15	Each is a predicate returning nonzero for true,
	16	zero for false.
	17	.I Isascii
	18	is defined on all integer values; the rest
	19	are defined only where
	20	.I isascii
	21	is true and on the single non-ASCII value
	22	EOF (see
	23	.IR stdio (3)).
	24	.TP 15n
	25	.I isalpha
	26	.I c
	27	is a letter
	28	.TP
	29	.I isupper
	30	.I c
	31	is an upper case letter
	32	.TP
	33	.I islower
	34	.I c
	35	is a lower case letter
	36	.TP
	37	.I isdigit
	38	.I c
	39	is a digit
	40	.TP
	41	.I isalnum
	42	.I c
	43	is an alphanumeric character
	44	.TP
	45	.I isspace
	46	.I c
	47	is a space, tab, carriage return, newline, or formfeed
	48	.TP
	49	.I ispunct
	50	.I c
	51	is a punctuation character (neither control nor alphanumeric)
	52	.TP
	53	.I isprint
	54	.I c
	55	is a printing character, code 040(8) (space) through 0176 (tilde)
	56	.TP
	57	.I iscntrl
	58	.I c
	59	is a delete character (0177) or ordinary control character
	60	(less than 040).
	61	.TP
	62	.I isascii
	63	.I c
	64	is an ASCII character, code less than 0200
65	.SH "SEE ALSO"
66	ascii(7)