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/*
* Copyright (C) 2009-2013 Freie Universitรคt Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup sys_shell Shell
* @ingroup sys
* @brief Simple shell interpreter
*
* @{
*
* @file
* @brief Shell interface definition
*/
#ifndef SHELL_H
#define SHELL_H
#include <stdint.h>
#include "kernel_defines.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Default shell buffer size (maximum line length shell can handle)
*/
#define SHELL_DEFAULT_BUFSIZE (128)
/**
* @brief Protype of a shell callback handler.
* @details The functions supplied to shell_run() must use this signature.
* The argument list is terminated with a NULL, i.e ``argv[argc] == NULL`.
* ``argv[0]`` is the function name.
*
* Escape sequences are removed before the function is called.
*
* The called function may edit `argv` and the contained strings,
* but it must be taken care of not to leave the boundaries of the array.
* This functionality can be used by getopt() or a similar function.
* @param[in] argc Number of arguments supplied to the function invocation.
* @param[in] argv The supplied argument list.
*
* @return 0 on success
* @return Anything else on failure
*/
typedef int (*shell_command_handler_t)(int argc, char **argv);
/**
* @brief A single command in the list of the supported commands.
* @details The list of commands is NULL terminated,
* i.e. the last element must be ``{ NULL, NULL, NULL }``.
*/
typedef struct shell_command_t {
const char *name; /**< Name of the function */
const char *desc; /**< Description to print in the "help" command. */
shell_command_handler_t handler; /**< The callback function. */
} shell_command_t;
/**
* @brief Start a shell.
*
* @param[in] commands ptr to array of command structs
* @param[in] line_buf Buffer that will be used for reading a line
* @param[in] len nr of bytes that fit in line_buf
*
* @returns This function does not return.
*/
void shell_run(const shell_command_t *commands, char *line_buf, int len) NORETURN;
#ifdef __cplusplus
}
#endif
#endif /* SHELL_H */
/** @} */
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