1 files changed, 97 insertions, 0 deletions
diff --git a/nuttx/lib/stdio/lib_meminstream.c b/nuttx/lib/stdio/lib_meminstream.c
new file mode 100644
index 000000000..839e56219
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+++ b/nuttx/lib/stdio/lib_meminstream.c
@@ -0,0 +1,97 @@
+/****************************************************************************
+ * lib/stdio/lib_meminstream.c
+ *
+ *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 "lib_internal.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: meminstream_getc
+ ****************************************************************************/
+
+static int meminstream_getc(FAR struct lib_instream_s *this)
+{
+  FAR struct lib_meminstream_s *mthis = (FAR struct lib_meminstream_s *)this;
+  int ret;
+
+  if (this && this->nget < mthis->buflen)
+    {
+      ret = mthis->buffer[this->nget];
+      this->nget++;
+    }
+  else
+    {
+      ret = EOF;
+    }
+  return ret;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_meminstream
+ *
+ * Description:
+ *   Initializes a stream for use with a fixed-size memory buffer.
+ *
+ * Input parameters:
+ *   meminstream - User allocated, uninitialized instance of struct
+ *                 lib_meminstream_s to be initialized.
+ *   bufstart    - Address of the beginning of the fixed-size memory buffer
+ *   buflen      - Size of the fixed-sized memory buffer in bytes
+ *
+ * Returned Value:
+ *   None (meminstream initialized).
+ *
+ ****************************************************************************/
+
+void lib_meminstream(FAR struct lib_meminstream_s *meminstream,
+                     FAR const char *bufstart, int buflen)
+{
+  meminstream->public.get  = meminstream_getc;
+  meminstream->public.nget = 0;          /* Will be buffer index */
+  meminstream->buffer      = bufstart;   /* Start of buffer */
+  meminstream->buflen      = buflen;     /* Length of the buffer */
+}
+
+