4 * This file is part of BeRTOS.
6 * Bertos is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
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17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * As a special exception, you may use this file as part of a free software
21 * library without restriction. Specifically, if other files instantiate
22 * templates or use macros or inline functions from this file, or you compile
23 * this file and link it with other files to produce an executable, this
24 * file does not by itself cause the resulting executable to be covered by
25 * the GNU General Public License. This exception does not however
26 * invalidate any other reasons why the executable file might be covered by
27 * the GNU General Public License.
29 * Copyright 2003, 2006 Develer S.r.l. (http://www.develer.com/)
30 * All Rights Reserved.
33 * \brief Serial protocol parser and commands.
35 * This file contains the serial protocol parser and
36 * the definition of the protocol commands. Commands are defined
37 * in a "CmdTemplate" type array, containing:
38 * - the name of the command,
39 * - the arguments it expects to receive,
40 * - the output values,
41 * - the name of the function implementing the command.
43 * The arguments and results are passed to command function
44 * using an union: the element of the union to use for each
45 * argument is determined by format strings present in the
50 * \author Bernie Innocenti <bernie@codewiz.org>
51 * \author Stefano Fedrigo <aleph@develer.com>
52 * \author Giovanni Bajo <rasky@develer.com>
60 #include "cfg/cfg_parser.h"
63 #include <struct/hashtable.h>
65 #include <stdlib.h> // atol(), NULL
66 #include <string.h> // strchr(), strcmp()
73 #define MAX_COMMANDS_NUMBER 128 // 64
75 /// Hashtable hook to extract the key from a command
76 static const void* get_key_from_command(const void* cmd, uint8_t* length);
78 /// Hashtable that handles the commands that can be executed
79 DECLARE_HASHTABLE_STATIC(commands, MAX_COMMANDS_NUMBER, get_key_from_command);
83 * \brief Tokenize one word at a time from a text.
85 * This function is similar to strtok, but does not use any implicit
86 * context, nor it does modify the input buffer in any form.
87 * The word is returned as a STL-like [begin,end) range.
89 * To extract the first word, make both begin and end point at the
90 * start of the text, and call the function. Then, subsequent
91 * calls will return the following words (assuming the begin/end
92 * variable are not modified between calls).
94 * \param begin Will contain the index of the first character of the word
95 * \param end Will contain the index of the character after the last
96 * character of the word
98 * \return True if a word was extracted, false if we got to the end
99 * of the string without extracting any word.
101 static bool get_word(const char **begin, const char **end)
103 const char *cur = *end;
105 while ((*cur == ' ' || *cur == '\t') && *cur)
110 while ((*cur != ' ' && *cur != '\t') && *cur)
115 return (*end != *begin);
120 * \brief Command arguments parser.
122 * Using the format pointed by the argument fmt
123 * parses the input string filling the array argv
124 * with input parameters of the correct type.
126 * \param fmt Parameters format string.
127 * \param input Input string.
128 * \param argv Array filled with parameters.
130 * \return False in case of errors, otherwise true.
132 static bool parseArgs(const char *fmt, const char *input, parms argv[])
134 const char *begin = input, *end = input;
138 // Extract the argument
139 if (!get_word(&begin, &end))
145 (*argv++).l = atol(begin);
153 ASSERT2(0, "Unknown format for argument");
160 /* check if there are remaining args */
161 if (get_word(&begin, &end))
170 * \brief Command result formatting and printing.
172 * Prints out on device fd the values contained
173 * in the array result, using the format specified
176 * \param ser Serial handle.
177 * \param fmt Values format string.
178 * \param result Array containing result to be printed.
180 * \return -1 in case of errors, otherwise 0.
182 static int printResult(struct Serial *ser, const char *fmt, parms result[])
189 if (*fmt >= '0' && *fmt <= '9')
191 /* Collect repeat count digit (left to right order) */
192 repeat_cnt = (repeat_cnt * 10) + (*fmt - '0');
196 /* Set default repeat cnt of 1 when not specified */
200 /* Loop repeat_cnt times */
206 ser_printf(ser, ARG_SEP_S "%ld", (*result).l);
210 ser_print(ser, ARG_SEP_S);
211 ser_print(ser, (*result).s);
215 ser_printf(ser, ARG_SEP_S "%s", (*result).s);
220 ser_printf(ser, ARG_SEP_S "%ld", n);
222 ser_printf(ser, ARG_SEP_S "%ld", (*result).l);
230 while (--repeat_cnt);
233 /* Skip to next format char */
239 ser_print(ser, "\r\n");
242 #endif /* UNUSED_CODE */
244 /// Hook provided by the parser for matching of command names (TAB completion) for readline
245 const char* parser_rl_match(UNUSED_ARG(void *,dummy), const char *word, int word_len)
248 HashIterator end = ht_iter_end(&commands);
249 const char *found = NULL;
251 for (cur = ht_iter_begin(&commands);
252 !ht_iter_cmp(cur, end);
253 cur = ht_iter_next(cur))
255 const struct CmdTemplate* cmdp = (const struct CmdTemplate*)ht_iter_get(cur);
256 if (strncmp(cmdp->name, word, word_len) == 0)
258 // If there was another matching word, it means that we have a multiple
259 // match: then return NULL.
270 bool parser_get_cmd_id(const char* line, unsigned long* ID)
272 const char *begin = line, *end = line;
275 // The first word is the ID
276 if (!get_word(&begin, &end))
279 *ID = strtoul(begin, &end2, 10);
286 const struct CmdTemplate* parser_get_cmd_template(const char *input)
288 // const struct CmdTemplate *cmdp;
290 const char *begin = input, *end = input;
292 // Skip the ID, and get the command
293 if (!get_word(&begin, &end))
295 if (!get_word(&begin, &end))
298 return (const struct CmdTemplate*)ht_find(&commands, begin, end-begin);
301 static const char *skip_to_params(const char *input, const struct CmdTemplate *cmdp)
303 const char *begin = input, *end = input;
305 // Skip the ID, and get the command
306 if (!get_word(&begin, &end))
308 if (!get_word(&begin, &end))
311 ASSERT2(strlen(cmdp->name) == (size_t)(end-begin), "Invalid command template specified");
312 ASSERT2(!strncmp(begin, cmdp->name, end-begin), "Invalid command template specified");
317 bool parser_get_cmd_arguments(const char* input, const struct CmdTemplate* cmdp, parms args[PARSER_MAX_ARGS])
319 input = skip_to_params(input, cmdp);
323 args[0].s = cmdp->name;
324 if (!parseArgs(cmdp->arg_fmt, input, args + 1))
330 static const void* get_key_from_command(const void* cmd, uint8_t* length)
332 const struct CmdTemplate* c = cmd;
333 *length = strlen(c->name);
337 bool parser_process_line(const char* input)
339 const struct CmdTemplate *cmdp;
340 parms args[PARSER_MAX_ARGS];
342 cmdp = parser_get_cmd_template(input);
346 if (!parser_get_cmd_arguments(input, cmdp, args))
349 if (!parser_execute_cmd(cmdp, args))
355 void parser_register_cmd(const struct CmdTemplate* cmd)
357 ht_insert(&commands, cmd);
360 #if CONFIG_INTERNAL_COMMANDS
361 #warning FIXME:This code use boost lib, if you compile with internal command you must fix it.
362 static ResultCode cmd_help(void)
366 // FIXME: There is no way at the moment to access the serial port. Dump
367 // this through JTAG for now
368 for (HashIterator iter = ht_iter_begin(&commands);
369 !ht_iter_cmp(iter, ht_iter_end(&commands));
370 iter = ht_iter_next(iter))
372 struct CmdTemplate* cmd = (struct CmdTemplate*)ht_iter_get(iter);
373 kprintf("%-20s", cmd->name);
374 for (unsigned j = 0; cmd->arg_fmt[j]; ++j)
375 kprintf("%c ", 'a' + j);
383 #include "cmd_hunk.h"
384 DECLARE_CMD_HUNK(help, (NIL), (NIL));
386 #endif // CONFIG_INTERNAL_COMMANDS
389 void parser_init(void)
391 // Initialize the hashtable used to store the command description
394 #if CONFIG_INTERNAL_COMMANDS
395 parser_register_cmd(&CMD_HUNK_TEMPLATE(help));