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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation.
* Copyright (c) 2009, Olivier MATZ <zer0@droids-corp.org>
* All rights reserved.
*/
#ifndef _RDLINE_H_
#define _RDLINE_H_
/**
* This file is a small equivalent to the GNU readline library, but it
* was originally designed for small systems, like Atmel AVR
* microcontrollers (8 bits). Indeed, we don't use any malloc that is
* sometimes not implemented (or just not recommended) on such
* systems.
*
* Obviously, it does not support as many things as the GNU readline,
* but at least it supports some interesting features like a kill
* buffer and a command history.
*
* It also have a feature that does not have the GNU readline (as far
* as I know): we can have several instances of it running at the same
* time, even on a monothread program, since it works with callbacks.
*
* The lib is designed for a client-side or a server-side use:
* - server-side: the server receives all data from a socket, including
* control chars, like arrows, tabulations, ... The client is
* very simple, it can be a telnet or a minicom through a serial line.
* - client-side: the client receives its data through its stdin for
* instance.
*/
#include <stdio.h>
#include <cmdline_cirbuf.h>
#include <cmdline_vt100.h>
#ifdef __cplusplus
extern "C" {
#endif
/* configuration */
#define RDLINE_BUF_SIZE 512
#define RDLINE_PROMPT_SIZE 32
#define RDLINE_VT100_BUF_SIZE 8
#define RDLINE_HISTORY_BUF_SIZE BUFSIZ
#define RDLINE_HISTORY_MAX_LINE 64
enum rdline_status {
RDLINE_INIT,
RDLINE_RUNNING,
RDLINE_EXITED
};
struct rdline;
typedef int (rdline_write_char_t)(struct rdline *rdl, char);
typedef void (rdline_validate_t)(struct rdline *rdl,
const char *buf, unsigned int size);
typedef int (rdline_complete_t)(struct rdline *rdl, const char *buf,
char *dstbuf, unsigned int dstsize,
int *state);
struct rdline {
enum rdline_status status;
/* rdline bufs */
struct cirbuf left;
struct cirbuf right;
char left_buf[RDLINE_BUF_SIZE+2]; /* reserve 2 chars for the \n\0 */
char right_buf[RDLINE_BUF_SIZE];
char prompt[RDLINE_PROMPT_SIZE];
unsigned int prompt_size;
char kill_buf[RDLINE_BUF_SIZE];
unsigned int kill_size;
/* history */
struct cirbuf history;
char history_buf[RDLINE_HISTORY_BUF_SIZE];
int history_cur_line;
/* callbacks and func pointers */
rdline_write_char_t *write_char;
rdline_validate_t *validate;
rdline_complete_t *complete;
/* vt100 parser */
struct cmdline_vt100 vt100;
/* opaque pointer */
void *opaque;
};
/**
* Init fields for a struct rdline. Call this only once at the beginning
* of your program.
* \param rdl A pointer to an uninitialized struct rdline
* \param write_char The function used by the function to write a character
* \param validate A pointer to the function to execute when the
* user validates the buffer.
* \param complete A pointer to the function to execute when the
* user completes the buffer.
*/
int rdline_init(struct rdline *rdl,
rdline_write_char_t *write_char,
rdline_validate_t *validate,
rdline_complete_t *complete);
/**
* Init the current buffer, and display a prompt.
* \param rdl A pointer to a struct rdline
* \param prompt A string containing the prompt
*/
void rdline_newline(struct rdline *rdl, const char *prompt);
/**
* Call it and all received chars will be ignored.
* \param rdl A pointer to a struct rdline
*/
void rdline_stop(struct rdline *rdl);
/**
* Same than rdline_stop() except that next calls to rdline_char_in()
* will return RDLINE_RES_EXITED.
* \param rdl A pointer to a struct rdline
*/
void rdline_quit(struct rdline *rdl);
/**
* Restart after a call to rdline_stop() or rdline_quit()
* \param rdl A pointer to a struct rdline
*/
void rdline_restart(struct rdline *rdl);
/**
* Redisplay the current buffer
* \param rdl A pointer to a struct rdline
*/
void rdline_redisplay(struct rdline *rdl);
/**
* Reset the current buffer and setup for a new line.
* \param rdl A pointer to a struct rdline
*/
void rdline_reset(struct rdline *rdl);
/* return status for rdline_char_in() */
#define RDLINE_RES_SUCCESS 0
#define RDLINE_RES_VALIDATED 1
#define RDLINE_RES_COMPLETE 2
#define RDLINE_RES_NOT_RUNNING -1
#define RDLINE_RES_EOF -2
#define RDLINE_RES_EXITED -3
/**
* append a char to the readline buffer.
* Return RDLINE_RES_VALIDATE when the line has been validated.
* Return RDLINE_RES_COMPLETE when the user asked to complete the buffer.
* Return RDLINE_RES_NOT_RUNNING if it is not running.
* Return RDLINE_RES_EOF if EOF (ctrl-d on an empty line).
* Else return RDLINE_RES_SUCCESS.
* XXX error case when the buffer is full ?
*
* \param rdl A pointer to a struct rdline
* \param c The character to append
*/
int rdline_char_in(struct rdline *rdl, char c);
/**
* Return the current buffer, terminated by '\0'.
* \param rdl A pointer to a struct rdline
*/
const char *rdline_get_buffer(struct rdline *rdl);
/**
* Add the buffer to history.
* return < 0 on error.
* \param rdl A pointer to a struct rdline
* \param buf A buffer that is terminated by '\0'
*/
int rdline_add_history(struct rdline *rdl, const char *buf);
/**
* Clear current history
* \param rdl A pointer to a struct rdline
*/
void rdline_clear_history(struct rdline *rdl);
/**
* Get the i-th history item
*/
char *rdline_get_history_item(struct rdline *rdl, unsigned int i);
#ifdef __cplusplus
}
#endif
#endif /* _RDLINE_H_ */
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