2 * Copyright (c) <2010>, Intel Corporation
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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10 * notice, this list of conditions and the following disclaimer.
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13 * notice, this list of conditions and the following disclaimer in
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18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
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30 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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36 * Copyright (c) 2009, Olivier MATZ <zer0@droids-corp.org>
37 * All rights reserved.
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions are met:
41 * * Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * * Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * * Neither the name of the University of California, Berkeley nor the
47 * names of its contributors may be used to endorse or promote products
48 * derived from this software without specific prior written permission.
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
51 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
52 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
53 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
54 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
55 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
56 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
57 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
58 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
59 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
66 * This file is a small equivalent to the GNU readline library, it was
67 * originally designed for very small systems (an 8-bits Atmel AVR
68 * microcontroller), but the library can now run on many emmbedded
69 * systems with or without OS.
71 * Obviously, it does not support as many things as the GNU readline,
72 * but at least it supports some interresting features like a kill
73 * buffer and a command history.
75 * It also have a feature that does not have the GNU readline (as far
76 * as I know): it is possible to have several instances of readline
77 * running at the same time, even on a monothread program, since it
78 * works with callbacks.
81 #include <cmdline_cirbuf.h>
82 #include <cmdline_vt100.h>
85 #define RDLINE_BUF_SIZE 256
86 #define RDLINE_PROMPT_SIZE 32
87 #define RDLINE_VT100_BUF_SIZE 8
88 #define RDLINE_HISTORY_BUF_SIZE BUFSIZ
89 #define RDLINE_HISTORY_MAX_LINE 64
90 #define RDLINE_MAX_LINES 39
101 * callback given to rdline_help() to display the content of the
102 * help. The first argument is an opaque pointer. The other args
103 * are buffer and size.
105 typedef ssize_t (rdline_write_t)(const struct rdline *, void *, size_t);
108 typedef void (rdline_validate_t)(struct rdline *rdl,
109 const char *buf, unsigned int size);
110 typedef int (rdline_complete_t)(struct rdline *rdl, const char *buf,
111 char *dstbuf, unsigned int dstsize);
112 typedef int (rdline_help_t)(struct rdline *rdl, const char *buf,
113 rdline_write_t *write, void *opaque);
116 enum rdline_status status;
123 char left_buf[RDLINE_BUF_SIZE+2]; /* reserve 2 chars for the \n\0 */
124 char right_buf[RDLINE_BUF_SIZE];
126 char prompt[RDLINE_PROMPT_SIZE];
128 #ifndef NO_RDLINE_KILL_BUF
129 char kill_buf[RDLINE_BUF_SIZE];
130 unsigned int kill_size;
133 #ifndef NO_RDLINE_HISTORY
135 struct cirbuf history;
136 char history_buf[RDLINE_HISTORY_BUF_SIZE];
137 int history_cur_line;
140 /* callbacks and func pointers */
141 rdline_validate_t *validate;
142 rdline_complete_t *complete;
146 struct cmdline_vt100 vt100;
152 char *pager_buf; /* buffer used to store paged data */
153 int pager_len; /* total len of buffer */
154 int pager_off; /* offset of next data */
155 int pager_lines; /* number of lines displayed */
160 * Init fields for a struct rdline.
162 * @param rdl A pointer to an uninitialized struct rdline
164 * Input file descriptor
166 * Output file descriptor
168 * A pointer to the function to execute when the user validates the
171 * A pointer to the function to execute when the user completes the
174 * A pointer to the function to execute when the user ask for
177 void rdline_init(struct rdline *rdl,
178 int fd_in, int fd_out,
179 rdline_validate_t *validate,
180 rdline_complete_t *complete,
181 rdline_help_t *help);
185 * Init the current buffer, and display a prompt.
187 * Also set the rdline status to "running", overriding previous
188 * rdline_stop() or rdline_quit().
191 * A pointer to an initialized struct rdline
193 * A string containing the prompt
195 void rdline_newline(struct rdline *rdl, const char *prompt);
198 * Ignore all subsequent received chars.
201 * A pointer to a struct rdline
203 void rdline_stop(struct rdline *rdl);
206 * Exit from running rdline loop
208 * Same than rdline_stop() except that next calls to rdline_char_in()
209 * will return RDLINE_RES_EXITED. Hence, any running rdline() function is
213 * A pointer to a struct rdline
215 void rdline_quit(struct rdline *rdl);
218 * Restart after a call to rdline_stop() or rdline_quit()
221 * A pointer to a struct rdline
223 void rdline_restart(struct rdline *rdl);
226 * Redisplay the current buffer
229 * A pointer to a struct rdline
231 void rdline_redisplay(struct rdline *rdl);
234 /* return status for rdline_char_in() */
235 #define RDLINE_RES_SUCCESS 0
236 #define RDLINE_RES_VALIDATED 1
237 #define RDLINE_RES_NOT_RUNNING -1
238 #define RDLINE_RES_EOF -2
239 #define RDLINE_RES_EXITED -3
242 * Append a char to the readline buffer.
245 * A pointer to a struct rdline
247 * The character to append
249 * - RDLINE_RES_VALIDATED when the line has been validated.
250 * - RDLINE_RES_NOT_RUNNING if it is not running.
251 * - RDLINE_RES_EOF if EOF (ctrl-d on an empty line).
252 * - RDLINE_RES_EXITED if user called rdline_quit()
253 * - Else return RDLINE_RES_SUCCESS.
255 int rdline_char_in(struct rdline *rdl, char c);
258 * Read (and edit) a line
261 * A pointer to a struct rdline
265 * - RDLINE_RES_VALIDATED when the line has been validated.
266 * - RDLINE_RES_NOT_RUNNING if it is not running.
267 * - RDLINE_RES_EOF if EOF (ctrl-d on an empty line).
268 * - RDLINE_RES_EXITED if user called rdline_quit()
270 int rdline(struct rdline *rdl, const char *prompt);
273 * write a buffer on rdline file descriptor
276 * The rdline descriptor
278 * Pointer to the buffer
280 * Number of bytes to write
282 * On success, the number of bytes written is returned (zero
283 * indicates nothing was written). On error, -1 is returned, and
284 * errno is set appropriately
286 ssize_t rdline_write(const struct rdline *rdl, void *buf, size_t count);
289 * write on rdline file descriptor according to a format string
292 * The rdline descriptor
296 * Upon successful return, these functions return the number of
297 * characters printed (not including the trailing '\0' used to end
298 * output to strings). On error, a negative value is returned.
300 int rdline_printf(const struct rdline *rdl, const char *fmt, ...);
303 * write on rdline file descriptor according to a format string
306 * The rdline descriptor
310 * Variable argument list
312 * Upon successful return, these functions return the number of
313 * characters printed (not including the trailing '\0' used to end
314 * output to strings). On error, a negative value is returned.
316 int rdline_vprintf(const struct rdline *rdl, const char *fmt, va_list ap);
319 * Return the current buffer, terminated by '\0'.
322 * A pointer to a struct rdline
326 const char *rdline_get_buffer(struct rdline *rdl);
329 * Add the buffer to history.
332 * A pointer to a struct rdline
334 * A buffer that is terminated by '\0'
337 * - negative on error
339 int rdline_add_history(struct rdline *rdl, const char *buf);
342 * Clear current history
345 * A pointer to a struct rdline
347 void rdline_clear_history(struct rdline *rdl);
350 * Get the i-th history item
353 * A pointer to a struct rdline
355 * The index of the history item
357 * The i-th string of history, or NULL on error.
359 char *rdline_get_history_item(struct rdline *rdl, unsigned int i);
363 * Print data asynchronously (using pager if needed)
365 * If there is enough place to print data on the current page, it is
366 * printed synchronously. Else, a temporary buffer is allocated and
367 * the data is stored in it. When the main rdline is called again, the
368 * pager is flushed before parsing any other commands.
371 * The rdline descriptor
375 * Upon successful return, these functions return the number of
376 * characters printed (not including the trailing '\0' used to end
377 * output to strings). On error, a negative value is returned.
379 int rdline_asyncpager_printf(struct rdline *rdl, const char *fmt, ...);
383 #endif /* _RDLINE_H_ */