libc/locale: support iconv_open,iconv,iconv_close

Refs to:https://github.com/bminor/musl

Signed-off-by: dongjiuzhu1 <[email protected]>

Author: Donny9

LICENSE

@@ -6615,6 +6615,38 @@ 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.
 
+libs/libc/locale/big5.h
+libs/libc/locale/codepages.h
+libs/libc/locale/gb18030.h
+libs/libc/locale/hkscs.h
+libs/libc/locale/jis0208.h
+libs/libc/locale/ksc.h
+libs/libc/locale/legacychars.h
+libs/libc/locale/revjis.h
+libs/libc/locale/lib_iconv.c
+===================
+
+Copyright © 2005-2020 Rich Felker, et al.
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
 drivers/wireless/bluetooth/bt_uart.c
 drivers/wireless/bluetooth/bt_uart.h
 wireless/bluetooth

include/iconv.h

@@ -0,0 +1,60 @@
+/****************************************************************************
+ * include/iconv.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_ICONV_H
+#define __INCLUDE_ICONV_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/compiler.h>
+#include <sys/types.h>
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+typedef FAR void *iconv_t;
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+iconv_t iconv_open(FAR const char *to, FAR const char *from);
+size_t iconv(iconv_t cd, FAR char **in, FAR size_t *inb,
+             FAR char **out, FAR size_t *outb);
+int iconv_close(iconv_t cd);
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __INCLUDE_ICONV_H */

libs/libc/locale/Kconfig

@@ -35,6 +35,22 @@ config LIBC_LOCALE_PATH
 		This is the default search path to the location where
 		the message catalog file is expected to be found.
 
+config LIBC_LOCALE_CHINESE
+	bool "Enable chinese encoding"
+	default n
+
+config LIBC_LOCALE_CODEPAGES
+	bool "Enable codepages encoding"
+	default n
+
+config LIBC_LOCALE_JAPANESE
+	bool "Enable japanese encoding"
+	default n
+
+config LIBC_LOCALE_KOREAN
+	bool "Enable korean encoding"
+	default n
+
 endif
 
 endmenu # Locale Support

libs/libc/locale/Make.defs

@@ -24,7 +24,7 @@ ifeq ($(CONFIG_LIBC_LOCALE),y)
 
 CSRCS += lib_duplocale.c lib_freelocale.c lib_localeconv.c
 CSRCS += lib_newlocale.c lib_setlocale.c lib_uselocale.c
-CSRCS += lib_catalog.c lib_gettext.c lib_langinfo.c
+CSRCS += lib_catalog.c lib_gettext.c lib_langinfo.c lib_iconv.c
 
 # Add the locale directory to the build