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CC, Run-time functions, wcsspn

 *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Compares the characters in a wide-character string against a set of
  wide characters.  The function returns the length of the initial
  substring comprised entirely of characters in the set of wide
  characters.

  Syntax:

       #include <wchar.h>

       size_t wcsspn (const wchar_t *wstr1, const wchar_t *wstr2);
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