man pages section 3: Basic Library Functions

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Updated: July 2014
 
 

iswctype(3C)

Name

iswctype - test character for specified class

Synopsis

#include <wchar.h> 

int iswctype(wint_t wc, wctype_t charclass);

Description

The iswctype() function determines whether the wide-character code wc has the character class charclass, returning TRUE or FALSE. The iswctype() function is defined on WEOF and wide-character codes corresponding to the valid character encodings in the current locale. If the wc argument is not in the domain of the function, the result is undefined. If the value of charclass is invalid (that is, not obtained by a call to wctype(3C) or charclass is invalidated by a subsequent call to setlocale(3C) that has affected category LC_CTYPE), the result is indeterminate.

Return Values

The iswctype() function returns 0 for FALSE and non-zero for TRUE.

Usage

There are twelve strings that are reserved for the standard character classes:

"alnum"
"alpha"
"blank"
"cntrl"
"digit"
"graph"
"lower"
"print"
"punct"
"space"
"upper"
"xdigit"

In the table below, the functions in the left column are equivalent to the functions in the right column.

iswalnum(wc)
iswctype(wc, wctype("alnum"))
iswalpha(wc)
iswctype(wc, wctype("alpha"))
iswcntrl(wc)
iswctype(wc, wctype("cntrl"))
iswdigit( wc)
iswctype(wc, wctype("digit"))
iswgraph(wc)
iswctype(wc, wctype("graph"))
iswlower(wc)
iswctype(wc, wctype("lower"))
iswprint(wc)
iswctype(wc, wctype("print"))
iswpunct(wc)
iswctype( wc, wctype("punct"))
iswspace(wc)
iswctype(wc, wctype("space"))
iswupper(wc)
iswctype(wc, wctype("upper"))
iswxdigit(wc)
iswctype(wc, wctype("xdigit"))

The call

iswctype(wc, wctype("blank"))

does not have an equivalent isw*( ) function.

Attributes

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE
ATTRIBUTE VALUE
CSI
Enabled
Interface Stability
Standard
MT-Level
MT-Safe with exceptions

See Also

iswalpha(3C), setlocale(3C), wctype(3C), attributes(5), environ(5), standards(5)