ceph/src/seastar/dpdk/lib/librte_cmdline/cmdline_rdline.h

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation.
   3  * Copyright (c) 2009, Olivier MATZ <zer0@droids-corp.org>
   4  * All rights reserved.
   5  */
   6
   7 #ifndef _RDLINE_H_
   8 #define _RDLINE_H_
   9
  10 /**
  11  * This file is a small equivalent to the GNU readline library, but it
  12  * was originally designed for small systems, like Atmel AVR
  13  * microcontrollers (8 bits). Indeed, we don't use any malloc that is
  14  * sometimes not implemented (or just not recommended) on such
  15  * systems.
  16  *
  17  * Obviously, it does not support as many things as the GNU readline,
  18  * but at least it supports some interesting features like a kill
  19  * buffer and a command history.
  20  *
  21  * It also have a feature that does not have the GNU readline (as far
  22  * as I know): we can have several instances of it running at the same
  23  * time, even on a monothread program, since it works with callbacks.
  24  *
  25  * The lib is designed for a client-side or a server-side use:
  26  * - server-side: the server receives all data from a socket, including
  27  *   control chars, like arrows, tabulations, ... The client is
  28  *   very simple, it can be a telnet or a minicom through a serial line.
  29  * - client-side: the client receives its data through its stdin for
  30  *   instance.
  31  */
  32
  33 #include <stdio.h>
  34 #include <cmdline_cirbuf.h>
  35 #include <cmdline_vt100.h>
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 /* configuration */
  42 #define RDLINE_BUF_SIZE 512
  43 #define RDLINE_PROMPT_SIZE  32
  44 #define RDLINE_VT100_BUF_SIZE  8
  45 #define RDLINE_HISTORY_BUF_SIZE BUFSIZ
  46 #define RDLINE_HISTORY_MAX_LINE 64
  47
  48 enum rdline_status {
  49         RDLINE_INIT,
  50         RDLINE_RUNNING,
  51         RDLINE_EXITED
  52 };
  53
  54 struct rdline;
  55
  56 typedef int (rdline_write_char_t)(struct rdline *rdl, char);
  57 typedef void (rdline_validate_t)(struct rdline *rdl,
  58                                  const char *buf, unsigned int size);
  59 typedef int (rdline_complete_t)(struct rdline *rdl, const char *buf,
  60                                 char *dstbuf, unsigned int dstsize,
  61                                 int *state);
  62
  63 struct rdline {
  64         enum rdline_status status;
  65         /* rdline bufs */
  66         struct cirbuf left;
  67         struct cirbuf right;
  68         char left_buf[RDLINE_BUF_SIZE+2]; /* reserve 2 chars for the \n\0 */
  69         char right_buf[RDLINE_BUF_SIZE];
  70
  71         char prompt[RDLINE_PROMPT_SIZE];
  72         unsigned int prompt_size;
  73
  74         char kill_buf[RDLINE_BUF_SIZE];
  75         unsigned int kill_size;
  76
  77         /* history */
  78         struct cirbuf history;
  79         char history_buf[RDLINE_HISTORY_BUF_SIZE];
  80         int history_cur_line;
  81
  82         /* callbacks and func pointers */
  83         rdline_write_char_t *write_char;
  84         rdline_validate_t *validate;
  85         rdline_complete_t *complete;
  86
  87         /* vt100 parser */
  88         struct cmdline_vt100 vt100;
  89
  90         /* opaque pointer */
  91         void *opaque;
  92 };
  93
  94 /**
  95  * Init fields for a struct rdline. Call this only once at the beginning
  96  * of your program.
  97  * \param rdl A pointer to an uninitialized struct rdline
  98  * \param write_char The function used by the function to write a character
  99  * \param validate A pointer to the function to execute when the
 100  *                 user validates the buffer.
 101  * \param complete A pointer to the function to execute when the
 102  *                 user completes the buffer.
 103  */
 104 int rdline_init(struct rdline *rdl,
 105                  rdline_write_char_t *write_char,
 106                  rdline_validate_t *validate,
 107                  rdline_complete_t *complete);
 108
 109
 110 /**
 111  * Init the current buffer, and display a prompt.
 112  * \param rdl A pointer to a struct rdline
 113  * \param prompt A string containing the prompt
 114  */
 115 void rdline_newline(struct rdline *rdl, const char *prompt);
 116
 117 /**
 118  * Call it and all received chars will be ignored.
 119  * \param rdl A pointer to a struct rdline
 120  */
 121 void rdline_stop(struct rdline *rdl);
 122
 123 /**
 124  * Same than rdline_stop() except that next calls to rdline_char_in()
 125  * will return RDLINE_RES_EXITED.
 126  * \param rdl A pointer to a struct rdline
 127  */
 128 void rdline_quit(struct rdline *rdl);
 129
 130 /**
 131  * Restart after a call to rdline_stop() or rdline_quit()
 132  * \param rdl A pointer to a struct rdline
 133  */
 134 void rdline_restart(struct rdline *rdl);
 135
 136 /**
 137  * Redisplay the current buffer
 138  * \param rdl A pointer to a struct rdline
 139  */
 140 void rdline_redisplay(struct rdline *rdl);
 141
 142 /**
 143  * Reset the current buffer and setup for a new line.
 144  *  \param rdl A pointer to a struct rdline
 145  */
 146 void rdline_reset(struct rdline *rdl);
 147
 148
 149 /* return status for rdline_char_in() */
 150 #define RDLINE_RES_SUCCESS       0
 151 #define RDLINE_RES_VALIDATED     1
 152 #define RDLINE_RES_COMPLETE      2
 153 #define RDLINE_RES_NOT_RUNNING  -1
 154 #define RDLINE_RES_EOF          -2
 155 #define RDLINE_RES_EXITED       -3
 156
 157 /**
 158  * append a char to the readline buffer.
 159  * Return RDLINE_RES_VALIDATE when the line has been validated.
 160  * Return RDLINE_RES_COMPLETE when the user asked to complete the buffer.
 161  * Return RDLINE_RES_NOT_RUNNING if it is not running.
 162  * Return RDLINE_RES_EOF if EOF (ctrl-d on an empty line).
 163  * Else return RDLINE_RES_SUCCESS.
 164  * XXX error case when the buffer is full ?
 165  *
 166  * \param rdl A pointer to a struct rdline
 167  * \param c The character to append
 168  */
 169 int rdline_char_in(struct rdline *rdl, char c);
 170
 171 /**
 172  * Return the current buffer, terminated by '\0'.
 173  * \param rdl A pointer to a struct rdline
 174  */
 175 const char *rdline_get_buffer(struct rdline *rdl);
 176
 177
 178 /**
 179  * Add the buffer to history.
 180  * return < 0 on error.
 181  * \param rdl A pointer to a struct rdline
 182  * \param buf A buffer that is terminated by '\0'
 183  */
 184 int rdline_add_history(struct rdline *rdl, const char *buf);
 185
 186 /**
 187  * Clear current history
 188  * \param rdl A pointer to a struct rdline
 189  */
 190 void rdline_clear_history(struct rdline *rdl);
 191
 192 /**
 193  * Get the i-th history item
 194  */
 195 char *rdline_get_history_item(struct rdline *rdl, unsigned int i);
 196
 197 #ifdef __cplusplus
 198 }
 199 #endif
 200
 201 #endif /* _RDLINE_H_ */