wctype, wctype_l - define character class
wctype_t wctype(const char *property);
[CX] wctype_t wctype_l(const char *property, locale_t locale);
For wctype(): [CX] 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() [CX] and wctype_l() functions are defined for valid character class names as defined in the current locale [CX] 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:
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() [CX] and iswctype_l().
The wctype() [CX] 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 [CX] 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.
[CX] 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() [CX] 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() [CX] and iswctype_l().
No errors are defined.
First released in Issue 4.
The following change has been made in this version for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E):
The wctype_l() function is added from The Open Group Technical Standard, 2006, Extended API Set Part 4.
POSIX.1-2008, Technical Corrigendum 1, XSH/TC1-2008/0736 , XSH/TC1-2008/0737 , and XSH/TC1-2008/0738  are applied.
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