2 * lib.h - library include for command line tools
4 * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
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8 * modification, are permitted provided that the following conditions
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16 * may be used to endorse or promote products derived from this software
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19 * Alternatively, provided that this notice is retained in full, this
20 * software may be distributed under the terms of the GNU General
21 * Public License ("GPL") version 2, in which case the provisions of the
22 * GPL apply INSTEAD OF those given above.
24 * The provided data structures and external interfaces from this code
25 * are not restricted to be used by modules with a GPL compatible license.
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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40 * Send feedback to <linux-can@vger.kernel.org>
44 #ifndef CAN_UTILS_LIB_H
45 #define CAN_UTILS_LIB_H
49 /* buffer sizes for CAN frame string representations */
51 #define CL_ID (sizeof("12345678##1"))
52 #define CL_DATA sizeof(".AA")
53 #define CL_BINDATA sizeof(".10101010")
55 /* CAN FD ASCII hex short representation with DATA_SEPERATORs */
56 #define CL_CFSZ (2*CL_ID + 64*CL_DATA)
58 /* CAN FD ASCII hex long representation with binary output */
59 #define CL_LONGCFSZ (2*CL_ID + sizeof(" [255] ") + (64*CL_BINDATA))
61 /* CAN DLC to real data length conversion helpers especially for CAN FD */
63 /* get data length from can_dlc with sanitized can_dlc */
64 unsigned char can_dlc2len(unsigned char can_dlc);
66 /* map the sanitized data length to an appropriate data length code */
67 unsigned char can_len2dlc(unsigned char len);
69 unsigned char asc2nibble(char c);
71 * Returns the decimal value of a given ASCII hex character.
73 * While 0..9, a..f, A..F are valid ASCII hex characters.
74 * On invalid characters the value 16 is returned for error handling.
77 int hexstring2data(char *arg, unsigned char *data, int maxdlen);
79 * Converts a given ASCII hex string to a (binary) byte string.
81 * A valid ASCII hex string consists of an even number of up to 16 chars.
82 * Leading zeros '00' in the ASCII hex string are interpreted.
86 * "1234" => data[0] = 0x12, data[1] = 0x34
87 * "001234" => data[0] = 0x00, data[1] = 0x12, data[2] = 0x34
91 * 1 = error (in length or the given characters are no ASCII hex characters)
93 * Remark: The not written data[] elements are initialized with zero.
97 int parse_canframe(char *cs, struct canfd_frame *cf);
99 * Transfers a valid ASCII string decribing a CAN frame into struct canfd_frame.
102 * - string layout <can_id>#{R{len}|data}
103 * - {data} has 0 to 8 hex-values that can (optionally) be separated by '.'
104 * - {len} can take values from 0 to 8 and can be omitted if zero
105 * - return value on successful parsing: CAN_MTU
108 * - string layout <can_id>##<flags>{data}
109 * - <flags> a single ASCII Hex value (0 .. F) which defines canfd_frame.flags
110 * - {data} has 0 to 64 hex-values that can (optionally) be separated by '.'
111 * - return value on successful parsing: CANFD_MTU
113 * Return value on detected problems: 0
115 * <can_id> can have 3 (standard frame format) or 8 (extended frame format)
121 * 123# -> standard CAN-Id = 0x123, len = 0
122 * 12345678# -> extended CAN-Id = 0x12345678, len = 0
123 * 123#R -> standard CAN-Id = 0x123, len = 0, RTR-frame
124 * 123#R0 -> standard CAN-Id = 0x123, len = 0, RTR-frame
125 * 123#R7 -> standard CAN-Id = 0x123, len = 7, RTR-frame
126 * 7A1#r -> standard CAN-Id = 0x7A1, len = 0, RTR-frame
128 * 123#00 -> standard CAN-Id = 0x123, len = 1, data[0] = 0x00
129 * 123#1122334455667788 -> standard CAN-Id = 0x123, len = 8
130 * 123#11.22.33.44.55.66.77.88 -> standard CAN-Id = 0x123, len = 8
131 * 123#11.2233.44556677.88 -> standard CAN-Id = 0x123, len = 8
132 * 32345678#112233 -> error frame with CAN_ERR_FLAG (0x2000000) set
134 * 123##0112233 -> CAN FD frame standard CAN-Id = 0x123, flags = 0, len = 3
135 * 123##1112233 -> CAN FD frame, flags = CANFD_BRS, len = 3
136 * 123##2112233 -> CAN FD frame, flags = CANFD_ESI, len = 3
137 * 123##3 -> CAN FD frame, flags = (CANFD_ESI | CANFD_BRS), len = 0
139 * CAN FD extension to handle the canfd_frame.flags content
141 * Simple facts on this compact ASCII CAN frame representation:
143 * - 3 digits: standard frame format
144 * - 8 digits: extendend frame format OR error frame
145 * - 8 digits with CAN_ERR_FLAG (0x2000000) set: error frame
146 * - an error frame is never a RTR frame
147 * - CAN FD frames do not have a RTR bit
150 void fprint_canframe(FILE *stream , struct canfd_frame *cf, char *eol, int sep, int maxdlen);
151 void sprint_canframe(char *buf , struct canfd_frame *cf, int sep, int maxdlen);
153 * Creates a CAN frame hexadecimal output in compact format.
154 * The CAN data[] is separated by '.' when sep != 0.
156 * The type of the CAN frame (CAN 2.0 / CAN FD) is specified by maxdlen:
157 * maxdlen = 8 -> CAN2.0 frame
158 * maxdlen = 64 -> CAN FD frame
160 * 12345678#112233 -> extended CAN-Id = 0x12345678, len = 3, data, sep = 0
161 * 12345678#R -> extended CAN-Id = 0x12345678, RTR, len = 0
162 * 12345678#R5 -> extended CAN-Id = 0x12345678, RTR, len = 5
163 * 123#11.22.33.44.55.66.77.88 -> standard CAN-Id = 0x123, dlc = 8, sep = 1
164 * 32345678#112233 -> error frame with CAN_ERR_FLAG (0x2000000) set
165 * 123##0112233 -> CAN FD frame standard CAN-Id = 0x123, flags = 0, len = 3
166 * 123##2112233 -> CAN FD frame, flags = CANFD_ESI, len = 3
170 * fprint_canframe(stdout, &frame, "\n", 0); // with eol to STDOUT
171 * fprint_canframe(stderr, &frame, NULL, 0); // no eol to STDERR
175 #define CANLIB_VIEW_ASCII 0x1
176 #define CANLIB_VIEW_BINARY 0x2
177 #define CANLIB_VIEW_SWAP 0x4
178 #define CANLIB_VIEW_ERROR 0x8
179 #define CANLIB_VIEW_INDENT_SFF 0x10
181 #define SWAP_DELIMITER '`'
183 void fprint_long_canframe(FILE *stream , struct canfd_frame *cf, char *eol, int view, int maxdlen);
184 void sprint_long_canframe(char *buf , struct canfd_frame *cf, int view, int maxdlen);
186 * Creates a CAN frame hexadecimal output in user readable format.
188 * The type of the CAN frame (CAN 2.0 / CAN FD) is specified by maxdlen:
189 * maxdlen = 8 -> CAN2.0 frame
190 * maxdlen = 64 -> CAN FD frame
192 * 12345678 [3] 11 22 33 -> extended CAN-Id = 0x12345678, dlc = 3, data
193 * 12345678 [0] remote request -> extended CAN-Id = 0x12345678, RTR
194 * 14B0DC51 [8] 4A 94 E8 2A EC 58 55 62 'J..*.XUb' -> (with ASCII output)
195 * 20001111 [7] C6 23 7B 32 69 98 3C ERRORFRAME -> (CAN_ERR_FLAG set)
196 * 12345678 [03] 11 22 33 -> CAN FD with extended CAN-Id = 0x12345678, dlc = 3
198 * 123 [3] 11 22 33 -> CANLIB_VIEW_INDENT_SFF == 0
199 * 123 [3] 11 22 33 -> CANLIB_VIEW_INDENT_SFF == set
203 * // CAN FD frame with eol to STDOUT
204 * fprint_long_canframe(stdout, &frame, "\n", 0, CANFD_MAX_DLEN);
206 * // CAN 2.0 frame without eol to STDERR
207 * fprint_long_canframe(stderr, &frame, NULL, 0, CAN_MAX_DLEN);
211 void snprintf_can_error_frame(char *buf, size_t len, const struct canfd_frame *cf,
214 * Creates a CAN error frame output in user readable format.