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man pages section 3: Basic Library Functions

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Updated: Thursday, June 13, 2019
 
 

iswctype_l(3C)

Name

iswctype, iswctype_l - test character for specified class

Synopsis

#include <wchar.h> 

int iswctype(wint_t wc, wctype_t charclass);
#include <wctype.h>

int iswctype_l(wint_t wc, wctype_t charclass, locale_t locale);

Description

The iswctype() and iswctype_l() functions determine whether the wide-character code wc has the character class charclass, returning TRUE or FALSE. The iswctype() and iswctype_l() functions are defined on WEOF and wide-character codes corresponding to the valid character encodings in the current locale, or in the locale represented by <locale>, respectively. 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.

The behavior is undefined if the <locale> argument to iswctype_l() is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle.

Return Values

The iswctype() and iswctype_l() functions return 0 for FALSE and non-zero for TRUE. If charclass is 0, these functions return 0.

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"))
iswblank(wc)
iswctype(wc, wctype("blank"))
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"))
iswalnum_l(wc, locale)
iswctype_l(wc, wctype("alnum"), locale)
iswalpha_l(wc, locale)
iswctype_l(wc, wctype("alpha"), locale)
iswblank_l(wc, locale)
iswctype_l(wc, wctype("blank"), locale)
iswcntrl_l(wc, locale)
iswctype_l(wc, wctype("cntrl"), locale)
iswdigit_l(wc, locale)
iswctype_l(wc, wctype("digit"), locale)
iswgraph_l(wc, locale)
iswctype_l(wc, wctype("graph"), locale)
iswlower_l(wc, locale)
iswctype_l(wc, wctype("lower"), locale)
iswprint_l(wc, locale)
iswctype_l(wc, wctype("print"), locale)
iswpunct_l(wc, locale)
iswctype_l(wc, wctype("punct"), locale)
iswspace_l(wc, locale)
iswctype_l(wc, wctype("space"), locale)
iswupper_l(wc, locale)
iswctype_l(wc, wctype("upper"), locale)
iswxdigit_l(wc, locale)
iswctype_l(wc, wctype("xdigit"), locale)

Attributes

See attributes(7) for descriptions of the following attributes:

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

See Also

duplocale(3C), freelocale(3C), iswalpha(3C), newlocale(3C), setlocale(3C), uselocale(3C), wctype(3C), attributes(7), environ(7), standards(7)