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.
#include <wctype.h> wctype_t wctype(const char *property); wctype_t wctype_l(const char *property, locale_t locale);
For wctype(): 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.1-2017 defers to the ISO C standard.
The wctype() and wctype_l() functions are defined for valid character class names as defined in the current locale or in the locale represented by locale, respectively.
The property argument is a string identifying a generic character class for which codeset-specific type information is required. The following character class names shall be defined in all locales:
alnum alpha blank cntrl
digit graph lower print
punct space upper xdigit
Additional character class names defined in the locale definition file (category LC_CTYPE) can also be specified.
These functions shall return a value of type wctype_t, which can be used as the second argument to subsequent calls of iswctype() and iswctype_l().
The wctype() and wctype_l() functions shall determine values of wctype_t according to the rules of the coded character set defined by character type information in the current locale or in the locale represented by locale, respectively (category LC_CTYPE).
The values returned by wctype() shall be valid until a call to setlocale() that modifies the category LC_CTYPE.
The values returned by wctype_l() shall be valid only in calls to iswctype_l() with a locale represented by locale with the same LC_CTYPE category value.
The behavior is undefined if the locale argument to wctype_l() is the special locale object LC_GLOBAL_LOCALE or is not a valid locale object handle.
The wctype() and wctype_l() functions shall return 0 if the given character class name is not valid for the current locale (category LC_CTYPE); otherwise, they shall return an object of type wctype_t that can be used in calls to iswctype() and iswctype_l().
No errors are defined.
The following sections are informative.
The Base Definitions volume of POSIX.1-2017, <wctype.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. 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.opengroup.org/unix/online.html .
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iswctype(3p), wchar.h(0p), wctype.h(0p).