wcscspn - get the length of a complementary wide substring
size_t wcscspn(const wchar_t *ws1, const wchar_t *ws2);
[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 wcscspn() function shall compute the length (in wide characters) of the maximum initial segment of the wide-character string pointed to by ws1 which consists entirely of wide-character codes not from the wide-character string pointed to by ws2.
The wcscspn() function shall return the length of the initial substring of ws1; no return value is reserved to indicate an error.
No errors are defined.
First released in Issue 4. Derived from the MSE working draft.
The RETURN VALUE section is updated to indicate that wcscspn() returns the length of ws1, rather than ws1 itself.
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