wcsspn - get the length of a wide substring
size_t wcsspn(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 wcsspn() 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 from the wide-character string pointed to by ws2.
The wcsspn() 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 wcsspn() returns the length of ws1 rather that ws1 itself.
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