bring in EXAMPLES from openbsd.

lib/libc/string/strcspn.3

@@ -34,9 +34,9 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     from: @(#)strcspn.3	8.1 (Berkeley) 6/4/93
-.\"	$NetBSD: strcspn.3,v 1.6 2002/02/07 07:00:32 ross Exp $
+.\"	$NetBSD: strcspn.3,v 1.7 2002/08/11 07:50:04 yamt Exp $
 .\"
-.Dd June 4, 1993
+.Dd August 11, 2002
 .Dt STRCSPN 3
 .Os
 .Sh NAME
@@ -68,6 +68,20 @@ The
 .Fn strcspn
 function
 returns the number of characters spanned.
+.Sh EXAMPLES
+The following call to
+.Fn strcspn
+will return 3, since the first three characters of string
+.Fa s
+do not occur in string
+.Fa charset :
+.Bd -literal -offset indent
+char *s = "foobar";
+char *charset = "bar";
+size_t span;
+
+span = strcspn(s, charset);
+.Ed
 .Sh SEE ALSO
 .Xr index 3 ,
 .Xr memchr 3 ,