stream: Add syslogstream implementation

which forward the output to syslog

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
Signed-off-by: chao an <anchao@xiaomi.com>

Author: xiaoxiang781216

include/nuttx/streams.h

@@ -230,6 +230,12 @@ struct lib_bufferedoutstream_s
  * lib_outstream_s
  */
 
+struct lib_syslogstream_s
+{
+  struct lib_outstream_s public;
+  int priority;
+};
+
 struct iob_s;  /* Forward reference */
 
 struct lib_syslograwstream_s
@@ -458,6 +464,24 @@ void lib_zeroinstream(FAR struct lib_instream_s *zeroinstream);
 void lib_nullinstream(FAR struct lib_instream_s *nullinstream);
 void lib_nulloutstream(FAR struct lib_outstream_s *nulloutstream);
 
+/****************************************************************************
+ * Name: lib_syslogstream
+ *
+ * Description:
+ *   Initializes syslog stream
+ *
+ * Input Parameters:
+ *   stream   - User allocated, uninitialized instance of struct
+ *              lib_syslogstream_s to be initialized.
+ *   priority - log priority.
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_syslogstream(FAR struct lib_syslogstream_s *stream, int priority);
+
 /****************************************************************************
  * Name: lib_syslograwstream_open
  *

libs/libc/stream/Make.defs

@@ -26,7 +26,7 @@ CSRCS += lib_memsostream.c lib_lowoutstream.c lib_rawinstream.c
 CSRCS += lib_rawoutstream.c lib_rawsistream.c lib_rawsostream.c
 CSRCS += lib_zeroinstream.c lib_nullinstream.c lib_nulloutstream.c
 CSRCS += lib_mtdoutstream.c lib_libnoflush.c lib_libsnoflush.c
-CSRCS += lib_syslograwstream.c lib_bufferedoutstream.c
+CSRCS += lib_syslogstream.c lib_syslograwstream.c lib_bufferedoutstream.c
 
 # The remaining sources files depend upon C streams
 

libs/libc/stream/lib_syslogstream.c

@@ -0,0 +1,97 @@
+/****************************************************************************
+ * libs/libc/stream/lib_syslogstream.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <assert.h>
+#include <errno.h>
+#include <stddef.h>
+#include <syslog.h>
+
+#include <nuttx/streams.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: syslogstream_putc
+ ****************************************************************************/
+
+static void syslogstream_putc(FAR struct lib_outstream_s *this, int ch)
+{
+  FAR struct lib_syslogstream_s *stream =
+                                       (FAR struct lib_syslogstream_s *)this;
+
+  DEBUGASSERT(stream != NULL);
+  syslog(stream->priority, "%c", ch);
+  stream->public.nput++;
+}
+
+static int syslogstream_puts(FAR struct lib_outstream_s *this,
+                             FAR const void *buff, int len)
+{
+  FAR struct lib_syslogstream_s *stream =
+                                       (FAR struct lib_syslogstream_s *)this;
+
+  DEBUGASSERT(stream != NULL);
+  if (len <= 0)
+    {
+      return 0;
+    }
+
+  syslog(stream->priority, "%.*s", len, (FAR const char *)buff);
+  return len;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_syslogstream
+ *
+ * Description:
+ *   Initializes syslog stream
+ *
+ * Input Parameters:
+ *   stream   - User allocated, uninitialized instance of struct
+ *              lib_syslogstream_s to be initialized.
+ *   priority - log priority.
+ *
+ * Returned Value:
+ *   None (User allocated instance initialized).
+ *
+ ****************************************************************************/
+
+void lib_syslogstream(FAR struct lib_syslogstream_s *stream, int priority)
+{
+  DEBUGASSERT(stream != NULL);
+
+  /* Initialize the common fields */
+
+  stream->public.nput  = 0;
+  stream->public.putc  = syslogstream_putc;
+  stream->public.puts  = syslogstream_puts;
+  stream->public.flush = lib_noflush;
+  stream->priority     = priority;
+}