Add an implementation of the semi-standard wcsdup() function, as found

on Microsoft and GNU systems.

include/wchar.h

@@ -214,6 +214,7 @@ int	wcwidth(wchar_t);
 wchar_t	*fgetwln(struct __sFILE * __restrict, size_t * __restrict);
 size_t	mbsnrtowcs(wchar_t * __restrict, const char ** __restrict, size_t,
 	    size_t, mbstate_t * __restrict);
+wchar_t	*wcsdup(const wchar_t *);
 size_t	wcsnrtombs(char * __restrict, const wchar_t ** __restrict, size_t,
 	    size_t, mbstate_t * __restrict);
 size_t	wcslcat(wchar_t *, const wchar_t *, size_t);

lib/libc/string/Makefile.inc

@@ -14,7 +14,7 @@ MISRCS+=bcmp.c bcopy.c bzero.c ffs.c ffsl.c fls.c flsl.c index.c memccpy.c \
 	strcasestr.c strnstr.c \
 	strpbrk.c strrchr.c strsep.c strsignal.c strspn.c strstr.c strtok.c \
 	strxfrm.c swab.c wcscat.c wcschr.c wcscmp.c wcscoll.c wcscpy.c \
-	wcscspn.c \
+	wcscspn.c wcsdup.c \
 	wcslcat.c wcslcpy.c wcslen.c wcsncat.c wcsncmp.c wcsncpy.c wcspbrk.c \
 	wcsrchr.c wcsspn.c wcsstr.c wcstok.c wcswidth.c wcsxfrm.c wmemchr.c \
 	wmemcmp.c \
@@ -53,7 +53,8 @@ MLINKS+=wmemchr.3 wmemcmp.3 wmemchr.3 wmemcpy.3 \
 	wmemchr.3 wmemmove.3 wmemchr.3 wmemset.3 \
 	wmemchr.3 wcscat.3 wmemchr.3 wcschr.3 \
 	wmemchr.3 wcscmp.3 wmemchr.3 wcscpy.3 \
-	wmemchr.3 wcscspn.3 wmemchr.3 wcslcat.3 \
+	wmemchr.3 wcscspn.3 wmemchr.3 wcsdup.3 \
+	wmemchr.3 wcslcat.3 \
 	wmemchr.3 wcslcpy.3 wmemchr.3 wcslen.3 \
 	wmemchr.3 wcsncat.3 wmemchr.3 wcsncmp.3 \
 	wmemchr.3 wcsncpy.3 wmemchr.3 wcspbrk.3 \

lib/libc/string/wcsdup.c

@@ -0,0 +1,43 @@
+/*-
+ * Copyright (c) 2005 Tim J. Robbins.
+ * 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 <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stdlib.h>
+#include <wchar.h>
+
+wchar_t *
+wcsdup(const wchar_t *s)
+{
+	wchar_t *copy;
+	size_t len;
+
+	len = wcslen(s) + 1;
+	if ((copy = malloc(len * sizeof(wchar_t))) == NULL)
+		return (NULL);
+	return (wmemcpy(copy, s, len));
+}

lib/libc/string/wmemchr.3

@@ -39,7 +39,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd December 22, 2000
+.Dd August 13, 2005
 .Dt WMEMCHR 3
 .Os
 .Sh NAME
@@ -53,6 +53,7 @@
 .Nm wcscmp ,
 .Nm wcscpy ,
 .Nm wcscspn ,
+.Nm wcsdup ,
 .Nm wcslcat ,
 .Nm wcslcpy ,
 .Nm wcslen ,
@@ -88,6 +89,8 @@
 .Fn wcscpy "wchar_t * restrict s1" "const wchar_t * restrict s2"
 .Ft size_t
 .Fn wcscspn "const wchar_t *s1" "const wchar_t *s2"
+.Ft wchar_t *
+.Fn wcsdup "const wchar_t *s"
 .Ft size_t
 .Fn wcslcat "wchar_t *s1" "const wchar_t *s2" "size_t n"
 .Ft size_t
@@ -125,6 +128,7 @@ counterpart, such as
 .Xr strcmp 3 ,
 .Xr strcpy 3 ,
 .Xr strcspn 3 ,
+.Xr strdup 3 ,
 .Xr strlcat 3 ,
 .Xr strlcpy 3 ,
 .Xr strlen 3 ,
@@ -139,7 +143,8 @@ counterpart, such as
 These functions conform to
 .St -isoC-99 ,
 with the exception of
-.Fn wcslcat
+.Fn wcsdup ,
+.Fn wcslcat ,
 and
 .Fn wcslcpy ,
 which are extensions.