96 lines
1.7 KiB
Groff
96 lines
1.7 KiB
Groff
.\" @(#)ctype.3 6.4 (Berkeley) 5/12/86
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.\"
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.TH CTYPE 3 "May 12, 1986"
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.AT 3
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.SH NAME
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ctype, isalpha, isupper, islower, isdigit, isxdigit, isalnum, isspace, ispunct, isprint, isgraph, iscntrl, isascii, toupper, tolower, toascii \- character classification macros
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.SH SYNOPSIS
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.nf
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.ft B
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#include <ctype.h>
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int isalpha(int \fIc\fP)
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\&...
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.fi
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.SH DESCRIPTION
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These macros classify characters
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by table lookup.
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Each is a predicate returning nonzero for true,
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zero for false.
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.B Isascii
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and
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.B toascii
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are defined on all integer values; the rest
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are defined only on the range of
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.B "unsigned char"
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and on the special value
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EOF (see
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.BR stdio (3)).
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.TP 15n
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.B isalpha
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.I c
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is a letter
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.TP
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.B isupper
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.I c
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is an upper case letter
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.TP
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.B islower
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.I c
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is a lower case letter
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.TP
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.B isdigit
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.I c
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is a digit
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.TP
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.B isxdigit
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.I c
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is a hex digit
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.TP
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.B isalnum
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.I c
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is an alphanumeric character
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.TP
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.B isspace
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.I c
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is a space, tab, carriage return, newline, vertical tab, or formfeed
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.TP
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.B ispunct
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.I c
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is a punctuation character (neither control nor alphanumeric)
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.TP
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.B isprint
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.I c
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is a printing character, code 040(8) (space) through 0176 (tilde)
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.TP
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.B isgraph
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.I c
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is a printing character, similar to
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.B isprint
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except false for space.
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.TP
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.B iscntrl
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.I c
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is a delete character (0177) or ordinary control character
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(less than 040).
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.TP
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.B isascii
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.I c
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is an ASCII character, code less than 0200
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.TP
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.B tolower
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.I c
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is converted to lower case. Return value is undefined if not
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.BR isupper (\fIc\fR).
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.TP
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.B toupper
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.I c
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is converted to upper case. Return value is undefined if not
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.BR islower (\fIc\fR).
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.TP
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.B toascii
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.I c
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is converted to be a valid ascii character.
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.SH "SEE ALSO"
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.BR ascii (7)
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