Changes to NSH and readline to permit NSH to work on a platform with no file system

1 files changed, 158 insertions, 0 deletions

diff --git a/apps/system/readline/std_readline.c b/apps/system/readline/std_readline.c
new file mode 100644
index 000000000..8778f1677
--- /dev/null
+++ b/apps/system/readline/std_readline.c
@@ -0,0 +1,158 @@
+/****************************************************************************
+ * apps/system/readline/std_readline.c
+ *
+ *   Copyright (C) 2013 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 <sys/types.h>
+#include <nuttx/arch.h>
+#include <apps/readline.h>
+
+#include "readline.h"
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+static int  readline_getc(FAR struct rl_common_s *vtbl);
+static void readline_putc(FAR struct rl_common_s *vtbl, int ch);
+static void readline_write(FAR struct rl_common_s *vtbl,
+                           FAR const char *buffer, size_t buflen);
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct rl_common_s g_stdreadline =
+{
+  readline_getc
+#ifdef CONFIG_READLINE_ECHO
+  , readline_putc
+  , readline_write
+#endif
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: readline_getc
+ ****************************************************************************/
+
+static int readline_getc(FAR struct rl_common_s *vtbl)
+{
+  return up_getc();
+}
+
+/****************************************************************************
+ * Name: readline_putc
+ ****************************************************************************/
+
+#ifdef CONFIG_READLINE_ECHO
+static void readline_putc(FAR struct rl_common_s *vtbl, int ch)
+{
+  up_putc(ch);
+}
+#endif
+
+/****************************************************************************
+ * Name: readline_write
+ ****************************************************************************/
+
+#ifdef CONFIG_READLINE_ECHO
+static void readline_write(FAR struct rl_common_s *vtbl,
+                           FAR const char *buffer, size_t buflen)
+{
+  for (; buflen > 0; buflen--)
+    {
+     up_putc(*buffer++);
+    }
+}
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: std_readline
+ *
+ *   readline() reads in at most one less than 'buflen' characters from
+ *   'instream' and stores them into the buffer pointed to by 'buf'.
+ *   Characters are echoed on 'outstream'.  Reading stops after an EOF or a
+ *   newline.  If a newline is read, it is stored into the buffer.  A null
+ *   terminator is stored after the last character in the buffer.
+ *
+ *   This version of realine assumes that we are reading and writing to
+ *   a VT100 console.  This will not work well if 'instream' or 'outstream'
+ *   corresponds to a raw byte steam.
+ *
+ *   This function is inspired by the GNU readline but is an entirely
+ *   different creature.
+ *
+ * Input Parameters:
+ *   buf       - The user allocated buffer to be filled.
+ *   buflen    - the size of the buffer.
+ *   instream  - The stream to read characters from
+ *   outstream - The stream to each characters to.
+ *
+ * Returned values:
+ *   On success, the (positive) number of bytes transferred is returned.
+ *   EOF is returned to indicate either an end of file condition or a
+ *   failure.
+ *
+ **************************************************************************/
+
+ssize_t std_readline(FAR char *buf, int buflen)
+{
+  return readline_common((FAR struct rl_common_s *)&g_stdreadline,
+                         buf, buflen);
+}