1 files changed, 90 insertions, 0 deletions
diff --git a/nuttx/libc/stdio/lib_ferror.c b/nuttx/libc/stdio/lib_ferror.c
new file mode 100644
index 000000000..4ad7d8cfc
--- /dev/null
+++ b/nuttx/libc/stdio/lib_ferror.c
@@ -0,0 +1,90 @@
+/****************************************************************************
+ * lib/stdio/lib_ferror.c
+ *
+ *   Copyright (C) 2012 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 <stdio.h>
+#include <errno.h>
+
+#include <nuttx/fs/fs.h>
+
+#if CONFIG_NFILE_STREAMS > 0
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: ferror
+ *
+ * Description:
+ *   This function will test if the last operation resulted in an eror.  This
+ *   is used to disambiguate EOF and error conditions.
+ *
+ * Return Value:
+ *   A non-zero value is returned to indicate the error condition.
+ *
+ ****************************************************************************/
+
+int ferror(FILE *stream)
+{
+#if 0
+  /* If an error is encountered by any of the C-buffered I/O functions, they
+   * should set the __FS_FLAG_ERROR in the fs_flags field of struct
+   * file_struct.
+   */
+
+  return (stream->fs_flags & __FS_FLAG_ERROR) != 0;
+#else
+  /* However, nothing currenlty sets the __FS_FLAG_ERROR flag (that is a job
+   * for another day).  The __FS_FLAG_EOF is set by operations that perform
+   * read operations.  Since ferror()  is probably only called to disambiguate
+   * the meaning of other functions that return EOF, to indicate either EOF or
+   * an error, just testing for not EOF is probably sufficient for now.
+   *
+   * This approach would not work if ferror() is called in other contexts. In
+   * those cases, ferror() will always report an error.
+   */
+
+  return (stream->fs_flags & __FS_FLAG_EOF) == 0;
+#endif
+}
+
+#endif /* CONFIG_NFILE_STREAMS */
+