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 IEEE Std 1003.1-2001 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.
wcsspn(), the Base Definitions volume of IEEE Std 1003.1-2001, <wchar.h>
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.