size_t wcscspn(const wchar_t *wcs, const wchar_t *reject);
The wcscspn() function is the wide-character equivalent of the strc-
spn(3) function. It determines the length of the longest initial seg-
ment of wcs which consists entirely of wide-characters not listed in
reject. In other words, it searches for the first occurrence in the
wide-character string wcs of any of the characters in the wide-charac-
ter string reject.
The wcscspn() function returns the number of wide characters in the
longest initial segment of wcs which consists entirely of wide-charac-
ters not listed in reject. In other words, it returns the position of
the first occurrence in the wide-character string wcs of any of the
characters in the wide-character string reject, or wcslen(wcs) if there
strcspn(3), wcspbrk(3), wcsspn(3)
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