libs/libc/wchar: add fputwc implementation

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

include/wchar.h

@@ -145,6 +145,7 @@ int               fwscanf(FILE *, FAR const wchar_t *, ...);
 wint_t            fgetwc(FILE *);
 FAR wchar_t      *fgetws(wchar_t *, int, FILE *);
 wint_t            fputwc(wchar_t, FILE *);
+wint_t            fputwc_unlocked(wchar_t, FAR FILE *);
 int               fputws(FAR const wchar_t *, FILE *);
 int               fwide(FILE *, int);
 wint_t            getwc(FILE *);

libs/libc/stdio/CMakeLists.txt

@@ -100,7 +100,8 @@ if(CONFIG_FILE_STREAM)
     lib_setvbuf.c
     lib_libstream.c
     lib_libfilelock.c
-    lib_libgetstreams.c)
+    lib_libgetstreams.c
+    lib_fputwc.c)
 endif()
 
 target_sources(c PRIVATE ${SRCS})

libs/libc/stdio/Make.defs

@@ -47,7 +47,7 @@ CSRCS += lib_fputs.c lib_ungetc.c lib_fprintf.c lib_vfprintf.c
 CSRCS += lib_feof.c lib_ferror.c lib_rewind.c lib_clearerr.c
 CSRCS += lib_scanf.c lib_vscanf.c lib_fscanf.c lib_vfscanf.c lib_tmpfile.c
 CSRCS += lib_setbuf.c lib_setvbuf.c lib_libstream.c lib_libfilelock.c
-CSRCS += lib_libgetstreams.c lib_setbuffer.c
+CSRCS += lib_libgetstreams.c lib_setbuffer.c lib_fputwc.c
 endif
 
 # Add the stdio directory to the build

libs/libc/stdio/lib_fputwc.c

@@ -0,0 +1,105 @@
+/****************************************************************************
+ * libs/libc/stdio/lib_fputwc.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 <wchar.h>
+#include <limits.h>
+#include <ctype.h>
+#include <nuttx/fs/fs.h>
+
+#include "libc.h"
+
+#ifdef CONFIG_FILE_STREAM
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: fputwc_unlocked
+ *
+ * Description:
+ *   Write wide character to stream without lock the stream
+ *
+ * Input Parameters:
+ *   c - the wide character to write
+ *   f - the FILE object that identifies an output stream
+ *
+ * Returned Value:
+ *   Return the wide character that written in to the stream on success,
+ *   return WEOF on fail write to the stream
+ *
+ ****************************************************************************/
+
+wint_t fputwc_unlocked(wchar_t c, FAR FILE *f)
+{
+  char mbc[MB_LEN_MAX];
+  int l;
+
+  if (isascii(c))
+    {
+      c = putc(c, f);
+    }
+  else
+    {
+      l = wctomb(mbc, c);
+      if (l < 0 || lib_fwrite_unlocked(mbc, l, f) < l)
+        {
+          c = WEOF;
+        }
+    }
+
+  return c;
+}
+
+/****************************************************************************
+ * Name: fputwc
+ *
+ * Description:
+ *   Write wide character to stream
+ *
+ * Input Parameters:
+ *   c - the wide character to write
+ *   f - the FILE object that identifies an output stream
+ *
+ * Returned Value:
+ *   Return the wide character that written in to the stream on success,
+ *   return WEOF on fail write to the stream
+ *
+ ****************************************************************************/
+
+wint_t fputwc(wchar_t c, FAR FILE *f)
+{
+  flockfile(f);
+  c = fputwc_unlocked(c, f);
+  funlockfile(f);
+  return c;
+}
+
+#endif /* CONFIG_FILE_STREAM */