Resync new repository with old repo r5166

git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5153 42af7a65-404d-4744-a932-0658087f49c3
2026-10-22 22:43:34 +08:00 · 2012-09-17 18:18:44 +00:00
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+/****************************************************************************
+ * lib/stdio/lib_libfwrite.c
+ *
+ *   Copyright (C) 2007-2009, 2011 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>  /* for CONFIG_STDIO_BUFFER_SIZE */
+
+#include <sys/types.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "lib_internal.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Constant Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: lib_fwrite
+ ****************************************************************************/
+
+ssize_t lib_fwrite(FAR const void *ptr, size_t count, FAR FILE *stream)
+#if CONFIG_STDIO_BUFFER_SIZE > 0
+{
+  FAR const unsigned char *start = ptr;
+  FAR const unsigned char *src   = ptr;
+  ssize_t ret = ERROR;
+  unsigned char *dest;
+
+  /* Make sure that writing to this stream is allowed */
+
+  if (!stream || (stream->fs_oflags & O_WROK) == 0)
+    {
+      set_errno(EBADF);
+      goto errout;
+    }
+
+  /* Get exclusive access to the stream */
+
+  lib_take_semaphore(stream);
+
+  /* If the buffer is currently being used for read access, then
+   * discard all of the read-ahead data.  We do not support concurrent
+   * buffered read/write access.
+   */
+
+  if (lib_rdflush(stream) < 0)
+    {
+      goto errout_with_semaphore;
+    }
+
+  /* Loop until all of the bytes have been buffered */
+
+  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 = lib_fflush(stream, false);
+          if (bytes_buffered < 0)
+            {
+              goto errout_with_semaphore;
+            }
+        }
+    }
+
+  /* Return the number of bytes written */
+
+  ret = src - start;
+
+errout_with_semaphore:
+  lib_give_semaphore(stream);
+
+errout:
+  return ret;
+}
+#else
+{
+  return write(stream->fs_filedes, ptr, count);
+}
+#endif /* CONFIG_STDIO_BUFFER_SIZE */
+