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ISWCTYPE(3P) POSIX Programmer's Manual ISWCTYPE(3P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
iswctype, iswctype_l — test character for a specified class
#include <wctype.h>
int iswctype(wint_t wc, wctype_t charclass);
int iswctype_l(wint_t wc, wctype_t charclass,
locale_t locale);
For iswctype(): The functionality described on this reference page is
aligned with the ISO C standard. Any conflict between the
requirements described here and the ISO C standard is unintentional.
This volume of POSIX.1‐2008 defers to the ISO C standard.
The iswctype() and iswctype_l() functions shall 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() or charclass is
invalidated by a subsequent call to setlocale() that has affected
category LC_CTYPE) the result is unspecified.
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.
The iswctype() and iswctype_l() functions shall return non-zero
(true) if and only if wc has the property described by charclass. If
charclass is 0, these functions shall return 0.
No errors are defined.
The following sections are informative.
Testing for a Valid Character
#include <wctype.h>
...
int yes_or_no;
wint_t wc;
wctype_t valid_class;
...
if ((valid_class=wctype("vowel")) == (wctype_t)0)
/* Invalid character class. */
yes_or_no=iswctype(wc,valid_class);
The twelve strings "alnum", "alpha", "blank", "cntrl", "digit",
"graph", "lower", "print", "punct", "space", "upper", and "xdigit"
are reserved for the standard character classes. 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"))
iswalnum_l(wc, locale) iswctype_l(wc, wctype("alnum"), locale)
iswalpha(wc) iswctype(wc, wctype("alpha"))
iswalpha_l(wc, locale) iswctype_l(wc, wctype("alpha"), locale)
iswblank(wc) iswctype(wc, wctype("blank"))
iswblank_l(wc, locale) iswctype_l(wc, wctype("blank"), locale)
iswcntrl(wc) iswctype(wc, wctype("cntrl"))
iswcntrl_l(wc, locale) iswctype_l(wc, wctype("cntrl"), locale)
iswdigit(wc) iswctype(wc, wctype("digit"))
iswdigit_l(wc, locale) iswctype_l(wc, wctype("digit"), locale)
iswgraph(wc) iswctype(wc, wctype("graph"))
iswgraph_l(wc, locale) iswctype_l(wc, wctype("graph"), locale)
iswlower(wc) iswctype(wc, wctype("lower"))
iswlower_l(wc, locale) iswctype_l(wc, wctype("lower"), locale)
iswprint(wc) iswctype(wc, wctype("print"))
iswprint_l(wc, locale) iswctype_l(wc, wctype("print"), locale)
iswpunct(wc) iswctype(wc, wctype("punct"))
iswpunct_l(wc, locale) iswctype_l(wc, wctype("punct"), locale)
iswspace(wc) iswctype(wc, wctype("space"))
iswspace_l(wc, locale) iswctype_l(wc, wctype("space"), locale)
iswupper(wc) iswctype(wc, wctype("upper"))
iswupper_l(wc, locale) iswctype_l(wc, wctype("upper"), locale)
iswxdigit(wc) iswctype(wc, wctype("xdigit"))
iswxdigit_l(wc, locale) iswctype_l(wc, wctype("xdigit"), locale)
None.
None.
iswalnum(3p), iswalpha(3p), iswcntrl(3p), iswdigit(3p), iswgraph(3p),
iswlower(3p), iswprint(3p), iswpunct(3p), iswspace(3p), iswupper(3p),
iswxdigit(3p), setlocale(3p), uselocale(3p), wctype(3p)
The Base Definitions volume of POSIX.1‐2008, locale.h(0p),
wctype.h(0p)
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) In the event of any discrepancy between this version and
the original IEEE and The Open Group Standard, the original IEEE and
The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 ISWCTYPE(3P)
Pages that refer to this page: wchar.h(0p), wctype.h(0p), iswalnum(3p), iswalpha(3p), iswblank(3p), iswcntrl(3p), iswdigit(3p), iswgraph(3p), iswlower(3p), iswprint(3p), iswpunct(3p), iswspace(3p), iswupper(3p), iswxdigit(3p), setlocale(3p), wctype(3p)