wcscspn - search a wide-character string for any of a set of wide characters

       For an explanation of the terms used in this section, see attributes(7).
       ┌─────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │ Interface                                                                   │ Attribute     │ Value   │
       ├─────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │ wcscspn()                                                                   │ Thread safety │ MT-Safe │
       └─────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────┘

       The  wcscspn()  function  is the wide-character equivalent of the strcspn(3) function.  It determines the
       length of the longest initial segment 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-character string reject.

       POSIX.1-2001, C99.

       Standard C library (libc, -lc)

       wcscspn - search a wide-character string for any of a set of wide characters

       The wcscspn() function returns the number of wide characters in the longest initial segment of wcs  which
       consists  entirely  of  wide-characters 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 is none.

strcspn(3), wcspbrk(3), wcsspn(3)

Linux man-pages 6.9.1                              2024-05-02                                         wcscspn(3)

       C11, POSIX.1-2008.

#include<wchar.h>size_twcscspn(constwchar_t*wcs,constwchar_t*reject);