[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
b75a3ab0 TL	1	.TH CTYPE 3
	2	.SH NAME
	3	isalpha, isupper, islower, isdigit, isalnum, isspace, ispunct, isprint, iscntrl, isascii \- character classification
	4	.SH SYNOPSIS
	5	.B #include <ctype.h>
	6	.PP
	7	.B isalpha(c)
	8	.PP
	9	.B . . .
	10	.SH DESCRIPTION
	11	These macros classify ASCII-coded integer values
	12	by table lookup.
	13	Each is a predicate returning nonzero for true,
	14	zero for false.
	15	.I Isascii
	16	is defined on all integer values; the rest
	17	are defined only where
	18	.I isascii
	19	is true and on the single non-ASCII value
	20	EOF (see
	21	.IR stdio (3)).
	22	.TP 15n
	23	.I isalpha
	24	.I c
	25	is a letter
	26	.TP
	27	.I isupper
	28	.I c
	29	is an upper case letter
	30	.TP
	31	.I islower
	32	.I c
	33	is a lower case letter
	34	.TP
	35	.I isdigit
	36	.I c
	37	is a digit
	38	.TP
	39	.I isalnum
	40	.I c
	41	is an alphanumeric character
	42	.TP
	43	.I isspace
	44	.I c
	45	is a space, tab, carriage return, newline, or formfeed
	46	.TP
	47	.I ispunct
	48	.I c
	49	is a punctuation character (neither control nor alphanumeric)
	50	.TP
	51	.I isprint
	52	.I c
	53	is a printing character, code 040(8) (space) through 0176 (tilde)
	54	.TP
	55	.I iscntrl
	56	.I c
	57	is a delete character (0177) or ordinary control character
	58	(less than 040).
	59	.TP
	60	.I isascii
	61	.I c
	62	is an ASCII character, code less than 0200
	63	.SH "SEE ALSO"
	64	ascii(7)