NuttX RTOS

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 162 insertions, 0 deletions

diff --git a/nuttx/lib/lib_libfwrite.c b/nuttx/lib/lib_libfwrite.c
new file mode 100644
index 000000000..cee26b194
--- /dev/null
+++ b/nuttx/lib/lib_libfwrite.c
@@ -0,0 +1,162 @@
+/************************************************************
+ * lib_libfwrite.c
+ *
+ *   Copyright (C) 2007 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 Gregory Nutt 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.
+ *
+ ************************************************************/
+
+/************************************************************
+ * Compilation Switches
+ ************************************************************/
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+#include <nuttx/config.h>  /* for CONFIG_STDIO_BUFFER_SIZE */
+#include <stdio.h>
+#include <errno.h>
+#include "lib_internal.h"
+
+/************************************************************
+ * Definitions
+ ************************************************************/
+
+/************************************************************
+ * Private Type Declarations
+ ************************************************************/
+
+/************************************************************
+ * Private Function Prototypes
+ ************************************************************/
+
+/************************************************************
+ * Global Constant Data
+ ************************************************************/
+
+/************************************************************
+ * Global Variables
+ ************************************************************/
+
+/************************************************************
+ * Private Constant Data
+ ************************************************************/
+
+/************************************************************
+ * Private Variables
+ ************************************************************/
+
+/************************************************************
+ * Global Functions
+ ************************************************************/
+
+/************************************************************
+ * lib_fwrite
+ ************************************************************/
+
+ssize_t lib_fwrite(const void *ptr, size_t count, FILE *stream)
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+{
+  const unsigned char *start = ptr;
+  const unsigned char *src   = ptr;
+  ssize_t bytes_written;
+  unsigned char *dest;
+
+  /* Make sure that writing to this stream is allowed */
+
+  if ((!stream) || ((stream->fs_oflags & O_WROK) == 0))
+    {
+      *get_errno_ptr() = EBADF;
+      bytes_written = -1;
+    }
+  else
+    {
+      /* Loop until all of the bytes have been buffered */
+
+      lib_take_semaphore(stream);
+      while (count > 0)
+	{
+	  /* Determine the number of bytes left in the buffer */
+
+	  size_t gulp_size = stream->fs_bufend - stream->fs_bufpos;
+
+	  /* Will the user data fit into the amount of buffer space
+	   * that we have left?
+	   */
+
+	  if (gulp_size > count)
+	    {
+	      /* Yes, clip the gulp to the size of the user data */
+
+	      gulp_size = count;
+	    }
+
+	  /* Adjust the number of bytes remaining to be transferred
+	   * on the next pass through the loop (might be zero).
+	   */
+
+	  count -= gulp_size;
+
+	  /* Transfer the data into the buffer */
+
+	  for (dest = stream->fs_bufpos; gulp_size > 0; gulp_size--)
+	    {
+	      *dest++ = *src++;
+	    }
+	  stream->fs_bufpos = dest;
+
+	  /* Is the buffer full? */
+
+	  if (dest >= stream->fs_bufend)
+	    {
+	      /* flush the buffered data to the IO stream */
+
+	      int bytes_buffered = fflush(stream);
+	      if (bytes_buffered < 0)
+		{
+		  bytes_written = bytes_buffered;
+		  goto err_out;
+		}
+	    }
+	}
+  
+      bytes_written = src - start;
+
+    err_out:
+      lib_give_semaphore(stream);
+    }
+  return bytes_written;
+}
+#else
+{
+  return write(stream->fs_filedes, ptr, count);
+}
+#endif