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