libs/libc/wchar: add getwc implementation

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

include/wchar.h

@@ -150,7 +150,7 @@ wint_t            fputwc_unlocked(wchar_t, FAR FILE *);
 int               fputws(FAR const wchar_t *, FILE *);
 int               fputws_unlocked(FAR const wchar_t *, FAR FILE *);
 int               fwide(FILE *, int);
-wint_t            getwc(FILE *);
+wint_t            getwc(FAR FILE *);
 wint_t            getwchar(void);
 int               mbsinit(FAR const mbstate_t *);
 size_t            mbrlen(FAR const char *, size_t, FAR mbstate_t *);

libs/libc/libc.csv

@@ -109,6 +109,7 @@
 "gets","stdio.h","defined(CONFIG_FILE_STREAM)","FAR char *","FAR char *"
 "gettext","libintl.h","defined(CONFIG_LIBC_LOCALE_GETTEXT)","FAR char *","FAR const char *"
 "gettimeofday","sys/time.h","","int","FAR struct timeval *","FAR struct timezone *"
+"getwc","wchar.h","defined(CONFIG_FILE_STREAM)","wint_t","FAR FILE *"
 "gmtime","time.h","","FAR struct tm *","FAR const time_t *"
 "gmtime_r","time.h","","FAR struct tm *","FAR const time_t *","FAR struct tm *"
 "htonl","arpa/inet.h","","uint32_t","uint32_t"

libs/libc/stdio/CMakeLists.txt

@@ -106,7 +106,8 @@ if(CONFIG_FILE_STREAM)
     lib_fputws.c
     lib_fopencookie.c
     lib_fmemopen.c
-    lib_fgetwc.c)
+    lib_fgetwc.c
+    lib_getwc.c)
 endif()
 
 target_sources(c PRIVATE ${SRCS})

libs/libc/stdio/Make.defs

@@ -49,6 +49,7 @@ CSRCS += lib_scanf.c lib_vscanf.c lib_fscanf.c lib_vfscanf.c lib_tmpfile.c
 CSRCS += lib_setbuf.c lib_setvbuf.c lib_libfilelock.c lib_libgetstreams.c
 CSRCS += lib_setbuffer.c lib_fputwc.c lib_putwc.c lib_fputws.c
 CSRCS += lib_fopencookie.c lib_fmemopen.c lib_open_memstream.c lib_fgetwc.c
+CSRCS += lib_getwc.c
 endif
 
 # Add the stdio directory to the build

libs/libc/stdio/lib_getwc.c

@@ -0,0 +1,60 @@
+/****************************************************************************
+ * libs/libc/stdio/lib_getwc.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>
+
+#ifdef CONFIG_FILE_STREAM
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: getwc
+ *
+ * Description:
+ *   Get wide character from stream
+ *
+ * Input Parameters:
+ *   f - Pointer to a FILE object that identifies an input stream
+ *
+ * Returned Value:
+ *   Return the character read is returned,
+ *   Return WEOF is the sequence of bytes that read cannot be interpreted as
+ *   a valid wide characted, and sets the errno to EILSEQ
+ *
+ ****************************************************************************/
+
+wint_t getwc(FAR FILE *f)
+{
+  return fgetwc(f);
+}
+
+#endif /* CONFIG_FILE_STREAM */