Add swprintf function

libc/libc.csv

@@ -176,6 +176,7 @@
 "strtoull","stdlib.h","defined(CONFIG_HAVE_LONG_LONG)","unsigned long long","FAR const char *","FAR char **","int"
 "strxfrm","string.h","defined(CONFIG_LIBC_LOCALE)","size_t","FAR char *","FAR const char *","size_t"
 "swab","unistd.h","","void","int","FAR const void *","FAR void *","ssize_t"
+"swprintf","wchar.h","defined(CONFIG_LIBC_WCHAR)","int","FAR wchar_t *","size_t","FAR const wchar_t *","..."
 "syslog","syslog.h","","int","int","FAR const char *","..."
 "tcflush","termios.h","CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_SERIAL_TERMIOS)","int","int","int"
 "tcgetattr","termios.h","CONFIG_NFILE_DESCRIPTORS > 0 && defined(CONFIG_SERIAL_TERMIOS)","int","int","FAR struct termios *"

libc/wchar/Make.defs

@@ -42,7 +42,7 @@ CSRCS += lib_wmemcpy.c lib_wmemmove.c lib_wmemset.c lib_btowc.c
 CSRCS += lib_mbrtowc.c lib_wctob.c lib_wcslcpy.c lib_wcsxfrm.c
 CSRCS += lib_wcrtomb.c lib_wcsftime.c lib_wcscoll.c lib_wcstol.c
 CSRCS += lib_wcstoll.c lib_wcstoul.c lib_wcstold.c lib_wcstof.c
-CSRCS += lib_wcstod.c
+CSRCS += lib_wcstod.c lib_swprintf.c
 
 # Add the wchar directory to the build
 

libc/wchar/lib_swprintf.c

@@ -0,0 +1,77 @@
+/****************************************************************************
+ * libc/wchar/lib_swprintf.c
+ *
+ *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <wchar.h>
+#include "libc.h"
+
+#include <nuttx/streams.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * swprintf
+ ****************************************************************************/
+
+int swprintf(FAR wchar_t *buf, size_t maxlen, FAR const wchar_t *fmt, ...)
+{
+  struct lib_memoutstream_s memoutstream;
+  va_list ap;
+  int n;
+
+  /* Initialize a memory stream to write to the buffer */
+
+  lib_memoutstream((FAR struct lib_memoutstream_s *)&memoutstream,
+                   (FAR char *) buf, LIB_BUFLEN_UNKNOWN);
+
+  /* Then let lib_vsprintf do the real work */
+
+  va_start(ap, fmt);
+  n = lib_vsprintf((FAR struct lib_outstream_s *)&memoutstream.public,
+                   (FAR const char *)fmt, ap);
+  va_end(ap);
+
+  return n;
+}