libs/libc/wchar: add putwchar implementation

Signed-off-by: guoshichao <guoshichao@xiaomi.com>

libs/libc/stdio/CMakeLists.txt

@@ -44,7 +44,8 @@ set(SRCS
     lib_remove.c
     lib_tempnam.c
     lib_tmpnam.c
-    lib_ultoa_invert.c)
+    lib_ultoa_invert.c
+    lib_putwchar.c)
 
 if(CONFIG_LIBC_FLOATINGPOINT)
   list(APPEND SRCS lib_dtoa_engine.c lib_dtoa_data.c)

libs/libc/stdio/Make.defs

@@ -28,7 +28,7 @@ CSRCS += lib_perror.c lib_putchar.c lib_getchar.c lib_puts.c
 CSRCS += lib_gets_s.c lib_gets.c lib_libdgets.c
 CSRCS += lib_sscanf.c lib_vsscanf.c lib_libvscanf.c lib_libvsprintf.c
 CSRCS += lib_remove.c lib_tempnam.c lib_tmpnam.c lib_ultoa_invert.c
-CSRCS += lib_renameat.c
+CSRCS += lib_renameat.c lib_putwchar.c
 
 ifeq ($(CONFIG_LIBC_FLOATINGPOINT),y)
 CSRCS += lib_dtoa_engine.c lib_dtoa_data.c

libs/libc/stdio/lib_putwchar.c

@@ -0,0 +1,69 @@
+/****************************************************************************
+ * libs/libc/stdio/lib_putwchar.c
+ *
+ * Copyright © 2005-2014 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <limits.h>
+#include <stdio.h>
+#include <wchar.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: putwchar
+ *
+ * Description:
+ *   Write wide character to stdout
+ *
+ * Input Parameters:
+ *   c - the wide character to write
+ *
+ * Returned Value:
+ *   Return the wide character that written in to the stdout on success,
+ *   return WEOF on fail write to the stdout
+ *
+ ****************************************************************************/
+
+wint_t putwchar(wchar_t c)
+{
+#ifdef CONFIG_FILE_STREAM
+  return fputwc(c, stdout);
+#else
+  char mbc[MB_LEN_MAX];
+  int l;
+  l = wctomb(mbc, c);
+  if (l < 0)
+    {
+      return WEOF;
+    }
+
+  return write(STDOUT_FILENO, mbc, l) == l ? c : WEOF;
+#endif
+}