Add GBK encoding

PR:             51504
Submitted by:   Statue <statue@freebsd.sinica.edu.tw>

3 files changed, 121 insertions, 2 deletions

diff --git a/lib/libc/locale/Makefile.inc b/lib/libc/locale/Makefile.inc
index 911fea4..fb02819 100644
--- a/lib/libc/locale/Makefile.inc
+++ b/lib/libc/locale/Makefile.inc
@@ -5,7 +5,7 @@
 .PATH: ${.CURDIR}/${MACHINE_ARCH}/locale ${.CURDIR}/locale
 
 SRCS+=	big5.c btowc.c collate.c collcmp.c euc.c fix_grouping.c frune.c \
-	isctype.c iswctype.c \
+	gbk.c isctype.c iswctype.c \
 	ldpart.c lmessages.c lmonetary.c lnumeric.c localeconv.c mblen.c \
 	mbrlen.c \
 	mbrtowc.c mbrune.c mbsinit.c mbsrtowcs.c mbtowc.c mbstowcs.c \
diff --git a/lib/libc/locale/gbk.c b/lib/libc/locale/gbk.c
new file mode 100644
index 0000000..8384070
--- /dev/null
+++ b/lib/libc/locale/gbk.c
@@ -0,0 +1,116 @@
+/*-
+ * Copyright (c) 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Paul Borman at Krystal Technologies.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <rune.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+rune_t  _GBK_sgetrune(const char *, size_t, char const **);
+int     _GBK_sputrune(rune_t, char *, size_t, char **);
+
+int
+_GBK_init(rl)
+	_RuneLocale *rl;
+{
+	rl->sgetrune = _GBK_sgetrune;
+	rl->sputrune = _GBK_sputrune;
+	_CurrentRuneLocale = rl;
+	__mb_cur_max = 2;
+	return (0);
+}
+
+static inline int
+_gbk_check(c)
+	u_int c;
+{
+	c &= 0xff;
+	return ((c >= 0x80 && c <= 0xfe) ? 2 : 1);
+}
+
+rune_t
+_GBK_sgetrune(string, n, result)
+	const char *string;
+	size_t n;
+	char const **result;
+{
+	rune_t rune = 0;
+	int len;
+
+	if (n < 1 || (len = _gbk_check(*string)) > n) {
+		if (result)
+			*result = string;
+		return (_INVALID_RUNE);
+	}
+	while (--len >= 0)
+		rune = (rune << 8) | ((u_int)(*string++) & 0xff);
+	if (result)
+		*result = string;
+	return rune;
+}
+
+int
+_GBK_sputrune(c, string, n, result)
+	rune_t c;
+	char *string, **result;
+	size_t n;
+{
+	if (c & 0x8000) {
+		if (n >= 2) {
+			string[0] = (c >> 8) & 0xff;
+			string[1] = c & 0xff;
+			if (result)
+				*result = string + 2;
+			return (2);
+		}
+	}
+	else {
+		if (n >= 1) {
+			*string = c & 0xff;
+			if (result)
+				*result = string + 1;
+			return (1);
+		}
+	}
+	if (result)
+		*result = string;
+	return (0);
+	
+}
diff --git a/lib/libc/locale/setrunelocale.c b/lib/libc/locale/setrunelocale.c
index 9cfe8d6..cd5384b 100644
--- a/lib/libc/locale/setrunelocale.c
+++ b/lib/libc/locale/setrunelocale.c
@@ -50,9 +50,10 @@ extern int		_none_init(_RuneLocale *);
 extern int		_UTF2_init(_RuneLocale *);
 extern int		_UTF8_init(_RuneLocale *);
 extern int		_EUC_init(_RuneLocale *);
+extern int		_GBK_init(_RuneLocale *);
 extern int		_BIG5_init(_RuneLocale *);
 extern int		_MSKanji_init(_RuneLocale *);
-extern _RuneLocale      *_Read_RuneMagi(FILE *);
+extern _RuneLocale	*_Read_RuneMagi(FILE *);
 
 int
 setrunelocale(char *encoding)
@@ -135,6 +136,8 @@ setrunelocale(char *encoding)
 		ret = _UTF8_init(rl);
 	else if (strcmp(rl->encoding, "EUC") == 0)
 		ret = _EUC_init(rl);
+	else if (strcmp(rl->encoding, "GBK") == 0)
+		ret = _GBK_init(rl);
 	else if (strcmp(rl->encoding, "BIG5") == 0)
 		ret = _BIG5_init(rl);
 	else if (strcmp(rl->encoding, "MSKanji") == 0)