iswctype - Determines the properties of a wide character
Standard C Library (libc.so, libc.a)
The XPG4 standard specifies that applications define this function by including wchar.h rather than wctype.h, which is required by the current version of the ISO C standard. Both include statements are supported.
Interfaces documented on this reference page conform to industry standards as follows:
iswctype(): ISO C, XPG4
Refer to the standards(5) reference page for more information about industry standards and associated tags.
Specifies the wide character to be tested. Specifies a handle for the property to be tested for.
The iswctype() function tests the wide character specified by the wc parameter to determine if it has the property specified by the wc_prop parameter. The wctype() function associates a character property with a wctype_t handle. You should get the value of the wc_prop parameter from a call to wctype() before using it in a call to iswctype(). The iswctype() function is defined for the wide-character null and for values in the character range of the current code set defined in the current locale.
Using an iswclass function, such as iswalnum(), is equivalent to using the iswctype() and wctype() functions to test for a basic property, such as alnum. However, iswctype() and wctype() can test wide characters against any class defined in a locale; the functions are not limited to testing for basic properties.
The following example tests if a wide character belongs to the class of blank characters as defined for the current locale. In this case, the required call to wctype() is included directly as the wc_prop parameter:
If the wc parameter has the property specified by the wc_prop parameter, the iswctype() function returns a nonzero value. If the value specified by the wc parameter does not have the property specified by the wc_prop parameter, the iswctype() function returns a value of 0 (zero). If the value specified by the wc parameter is not in the function's domain, the result is undefined. If the value specified by the wc_prop parameter is not valid, the result is undefined. The value of the wc_prop parameter can be invalid because it was not obtained by a call to the wctype() function. The wc_prop value can also be invalidated by an intervening call to the setlocale() function that has affected the LC_CTYPE environment variable.
Functions: ctype(3), towctrans(3), wctrans(3), wctype(3), setlocale(3), iswalnum(3) delim off