Add wcsnlen(3), wcslen(3) with a max len argument

Missing function hit by fcambus@ some time ago.  ok millert@

1 files changed, 45 insertions, 0 deletions

diff --git a/src/lib/libc/string/wcsnlen.c b/src/lib/libc/string/wcsnlen.c
new file mode 100644
index 0000000000..eb1d08e85b
--- /dev/null
+++ b/src/lib/libc/string/wcsnlen.c
@@ -0,0 +1,45 @@
+/*      $OpenBSD: wcsnlen.c,v 1.1 2024/07/14 09:51:18 jca Exp $ */
+/*      $NetBSD: wcslen.c,v 1.2 2001/01/03 14:29:36 lukem Exp $ */
+
+/*-
+ * Copyright (c)1999 Citrus Project,
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *      citrus Id: wcslen.c,v 1.1 1999/12/29 21:47:45 tshiozak Exp
+ */
+
+#include <wchar.h>
+
+size_t
+wcsnlen(const wchar_t *s, size_t maxlen)
+{
+        const wchar_t *p;
+
+        p = s;
+        while (maxlen-- && *p)
+                p++;
+
+        return p - s;
+}
+