/****************************************************************************
 * apps/system/readline/readline.h
 *
 *   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.
 *
 ****************************************************************************/

#ifndef __APPS_SYSTEM_READLINE_READLINE_H
#define __APPS_SYSTEM_READLINE_READLINE_H 1

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/
/* In some systems, the underlying serial logic may automatically echo
 * characters back to the console.  We will assume that that is not the case
 & here
 */

#define CONFIG_READLINE_ECHO 1

/* Some environments may return CR as end-of-line, others LF, and others
 * both.  If not specified, the logic here assumes either (but not both) as
 * the default.
 */

#if defined(CONFIG_EOL_IS_CR)
#  undef  CONFIG_EOL_IS_LF
#  undef  CONFIG_EOL_IS_BOTH_CRLF
#  undef  CONFIG_EOL_IS_EITHER_CRLF
#elif defined(CONFIG_EOL_IS_LF)
#  undef  CONFIG_EOL_IS_CR
#  undef  CONFIG_EOL_IS_BOTH_CRLF
#  undef  CONFIG_EOL_IS_EITHER_CRLF
#elif defined(CONFIG_EOL_IS_BOTH_CRLF)
#  undef  CONFIG_EOL_IS_CR
#  undef  CONFIG_EOL_IS_LF
#  undef  CONFIG_EOL_IS_EITHER_CRLF
#elif defined(CONFIG_EOL_IS_EITHER_CRLF)
#  undef  CONFIG_EOL_IS_CR
#  undef  CONFIG_EOL_IS_LF
#  undef  CONFIG_EOL_IS_BOTH_CRLF
#else
#  undef  CONFIG_EOL_IS_CR
#  undef  CONFIG_EOL_IS_LF
#  undef  CONFIG_EOL_IS_BOTH_CRLF
#  define CONFIG_EOL_IS_EITHER_CRLF 1
#endif

/* Helper macros */

#define RL_GETC(v)      ((v)->rl_getc(v))
#define RL_PUTC(v,ch)   ((v)->rl_putc(v,ch))
#define RL_WRITE(v,b,s) ((v)->rl_write(v,b,s))

/****************************************************************************
 * Public Type Declarations
 ****************************************************************************/

struct rl_common_s
{
   int  (*rl_getc)(FAR struct rl_common_s *vtbl);
#ifdef CONFIG_READLINE_ECHO
   void (*rl_putc)(FAR struct rl_common_s *vtbl, int ch);
   void (*rl_write)(FAR struct rl_common_s *vtbl, FAR const char *buffer,
                    size_t buflen);
#endif
};

/****************************************************************************
 * Public Data
 ****************************************************************************/

/****************************************************************************
 * Public Function Prototypes
 ****************************************************************************/

/****************************************************************************
 * Name: readline_common
 *
 *   Common logic shared by readline and std_readline().
 *
 * 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 readline_common(FAR struct rl_common_s *vtbl, FAR char *buf, int buflen);

#endif /* __APPS_SYSTEM_READLINE_READLINE_H */