libs/libc/wchar: add wcstok implementation

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

libs/libc/wchar/CMakeLists.txt

@@ -60,4 +60,5 @@ target_sources(
           lib_wcscspn.c
           lib_wcspbrk.c
           lib_wcsspn.c
-          lib_wcsstr.c)
+          lib_wcsstr.c
+          lib_wcstok.c)

libs/libc/wchar/Make.defs

@@ -29,7 +29,7 @@ CSRCS += lib_swprintf.c lib_mbsnrtowcs.c lib_wcsnrtombs.c lib_mbsinit.c
 CSRCS += lib_mbrlen.c lib_mbsrtowcs.c lib_wcsrtombs.c lib_wcscpy.c
 CSRCS += lib_wcscat.c lib_wcslcat.c lib_wcsncat.c lib_wcsrchr.c lib_wcschr.c
 CSRCS += lib_wcsncpy.c lib_wcsncmp.c lib_wcscspn.c lib_wcspbrk.c lib_wcsspn.c
-CSRCS += lib_wcsstr.c
+CSRCS += lib_wcsstr.c lib_wcstok.c
 
 # Add the wchar directory to the build
 

libs/libc/wchar/lib_wcstok.c

@@ -0,0 +1,80 @@
+/****************************************************************************
+ * libs/libc/wchar/lib_wcstok.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>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name:  wcstok
+ *
+ * Description:
+ *    Split wide string into tokens
+ *
+ * Input Parameters:
+ *   s - the source wide string to truncate
+ *   sep - the wide string containing the separator wide characters
+ *   p - the pointer of which using to store of the current tokenization
+ *       sequence
+ *
+ * Returned Value:
+ *   Return a pointer to the last token found in the wide string;
+ *   Return null pointer if there are no tokens left to retrieve
+ *
+ ****************************************************************************/
+
+FAR wchar_t *wcstok(FAR wchar_t *s, FAR const wchar_t *sep, FAR wchar_t **p)
+{
+  if (!s && !(s = *p))
+    {
+      return NULL;
+    }
+
+  s += wcsspn(s, sep);
+  if (!*s)
+    {
+      return *p = NULL;
+    }
+
+  *p = s + wcscspn(s, sep);
+
+  if (**p)
+    {
+      *(*p)++ = 0;
+    }
+  else
+    {
+      *p = NULL;
+    }
+
+  return s;
+}