From 7a2a491fdf72a1648e6b138a8eefd05ab81f65a0 Mon Sep 17 00:00:00 2001
From: John Marino <draco@marino.st>
Date: Mon, 21 Nov 2011 23:30:09 +0100
Subject: [PATCH] libc: Add wcsncasecmp function

This function performs a case-insensitive string comparison test of
not more than a specified number of wide characters.  It is a GNU
extension, not POSIX.  Some packages in pkgsrc may require it.
---
 include/wchar.h               |  1 +
 lib/libc/string/Makefile.inc  |  2 ++
 lib/libc/string/wcsncasecmp.c | 46 +++++++++++++++++++++++++++++++++++
 lib/libc/string/wmemchr.3     |  4 +++
 4 files changed, 53 insertions(+)
 create mode 100644 lib/libc/string/wcsncasecmp.c

diff --git a/include/wchar.h b/include/wchar.h
index 9a7e0277d0..3f602d2aed 100644
--- a/include/wchar.h
+++ b/include/wchar.h
@@ -134,6 +134,7 @@ size_t	wcscspn(const wchar_t *, const wchar_t *);
 size_t	wcsftime(wchar_t * __restrict, size_t, const wchar_t * __restrict,
 		 const struct tm * __restrict);
 int	wcscasecmp(const wchar_t *, const wchar_t *);
+int	wcsncasecmp(const wchar_t *, const wchar_t *, size_t n);
 size_t	wcslen(const wchar_t *);
 wchar_t	*wcsncat(wchar_t * __restrict, const wchar_t * __restrict, size_t);
 int	wcsncmp(const wchar_t *, const wchar_t *, size_t);
diff --git a/lib/libc/string/Makefile.inc b/lib/libc/string/Makefile.inc
index c6b60b042c..7b3168da36 100644
--- a/lib/libc/string/Makefile.inc
+++ b/lib/libc/string/Makefile.inc
@@ -19,6 +19,7 @@ MISRCS+=bcmp.c bcopy.c bzero.c ffs.c ffsl.c ffsll.c fls.c flsl.c flsll.c \
 	wcslcat.c wcslcpy.c wcslen.c wcsncat.c wcsncmp.c wcsncpy.c wcsnlen.c \
 	wcspbrk.c \
 	wcscasecmp.c \
+	wcsncasecmp.c \
 	wcsrchr.c wcsspn.c wcsstr.c wcstok.c wcswidth.c wcsxfrm.c wmemchr.c \
 	wmemcmp.c \
 	wmemcpy.c wmemmove.c wmemset.c
@@ -77,6 +78,7 @@ MLINKS+=wmemchr.3 wcscat.3 \
 	wmemchr.3 wcsspn.3 \
 	wmemchr.3 wcsstr.3 \
 	wmemchr.3 wcscasecmp.3 \
+	wmemchr.3 wcsncasecmp.3 \
 	wmemchr.3 wmemcmp.3 \
 	wmemchr.3 wmemcpy.3 \
 	wmemchr.3 wmemmove.3 \
diff --git a/lib/libc/string/wcsncasecmp.c b/lib/libc/string/wcsncasecmp.c
new file mode 100644
index 0000000000..820068dddb
--- /dev/null
+++ b/lib/libc/string/wcsncasecmp.c
@@ -0,0 +1,46 @@
+/*-
+ * Copyright (c) 2009 David Schultz <das@FreeBSD.org>
+ * 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.
+ */
+
+#include <wchar.h>
+#include <wctype.h>
+
+int
+wcsncasecmp(const wchar_t *s1, const wchar_t *s2, size_t n)
+{
+	wchar_t c1, c2;
+
+	if (n == 0)
+		return (0);
+	for (; *s1; s1++, s2++) {
+		c1 = towlower(*s1);
+		c2 = towlower(*s2);
+		if (c1 != c2)
+			return ((int)c1 - c2);
+		if (--n == 0)
+			return (0);
+	}
+	return (-*s2);
+}
diff --git a/lib/libc/string/wmemchr.3 b/lib/libc/string/wmemchr.3
index f26abc7714..d3d43d4a91 100644
--- a/lib/libc/string/wmemchr.3
+++ b/lib/libc/string/wmemchr.3
@@ -55,6 +55,7 @@
 .Nm wcslcat ,
 .Nm wcslcpy ,
 .Nm wcslen ,
+.Nm wcsncasecmp ,
 .Nm wcsncat ,
 .Nm wcsncmp ,
 .Nm wcsncpy ,
@@ -98,6 +99,8 @@
 .Fn wcslcpy "wchar_t *s1" "const wchar_t *s2" "size_t n"
 .Ft size_t
 .Fn wcslen "const wchar_t *s"
+.Ft int
+.Fn wcsncasecmp "const wchar_t *s1" "const wchar_t *s2" "size_t n"
 .Ft wchar_t *
 .Fn wcsncat "wchar_t * restrict s1" "const wchar_t * restrict s2" "size_t n"
 .Ft int
@@ -151,6 +154,7 @@ These functions conform to
 with the exception of
 .Fn wcscasecmp ,
 .Fn wcsdup ,
+.Fn wcsncasecmp ,
 and
 .Fn wcsnlen ,
 which conform to
-- 
2.41.0