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+.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
+.\"
+.\" This is free documentation; you can redistribute it and/or
+.\" modify it under the terms of the GNU General Public License as
+.\" published by the Free Software Foundation; either version 2 of
+.\" the License, or (at your option) any later version.
+.\"
+.\" References consulted:
+.\"   GNU glibc-2 source code and manual
+.\"   Dinkumware C library reference http://www.dinkumware.com/
+.\"   OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
+.\"   ISO/IEC 9899:1999
+.\"
+.TH WCSCSPN 3  1999-07-25 "GNU" "Linux Programmer's Manual"
+.SH NAME
+wcscspn \- search a wide-character string for any of a set of wide characters
+.SH SYNOPSIS
+.nf
+.B #include <wchar.h>
+.sp
+.BI "size_t wcscspn(const wchar_t *" wcs ", const wchar_t *" reject );
+.fi
+.SH DESCRIPTION
+The \fBwcscspn\fP function is the wide-character equivalent of the \fBstrcspn\fP
+function. It determines the length of the longest initial segment of \fIwcs\fP
+which consists entirely of wide-characters not listed in \fIreject\fP. In
+other words, it searches for the first occurrence in the wide-character
+string \fIwcs\fP of any of the characters in the wide-character string
+\fIreject\fP.
+.SH "RETURN VALUE"
+The \fBwcscspn\fP function returns the number of wide characters in the longest
+initial segment of \fIwcs\fP which consists entirely of wide-characters not
+listed in \fIreject\fP. In other words, it returns the position of the first
+occurrence in the wide-character string \fIwcs\fP of any of the characters in
+the wide-character string \fIreject\fP, or \fIwcslen(wcs)\fP if there is none.
+.SH "CONFORMING TO"
+ISO/ANSI C, UNIX98
+.SH "SEE ALSO"
+.BR strcspn (3),
+.BR wcspbrk (3),
+.BR wcsspn (3)