wcscspn(3)		    Library Functions Manual		      wcscspn(3)

NAME
     wcscspn  -	 search a wide-character string for any of a set of wide charac-
     ters

LIBRARY
     Standard C library (libc, -lc)

SYNOPSIS
     #include <wchar.h>

     size_t wcscspn(const wchar_t *wcs, const wchar_t *reject);

DESCRIPTION
     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.

RETURN VALUE
     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 oc-
     currence  in  the wide-character string wcs of any of the characters in the
     wide-character string reject, or wcslen(wcs) if there is none.

ATTRIBUTES
     For an explanation of the terms used in this  section,  see  attributes(7).
     allbox; lbx lb lb l l l.  Interface Attribute Value T{ wcscspn()
     T}	  Thread safety	  MT-Safe

STANDARDS
     C11, POSIX.1-2008.

HISTORY
     POSIX.1-2001, C99.

SEE ALSO
     strcspn(3), wcspbrk(3), wcsspn(3)

Linux man-pages 6.18		   2026-02-08			      wcscspn(3)