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/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
/*
* lib.c - library for command line tools
*
* Copyright (c) 2002-2007 Volkswagen Group Electronic Research
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Volkswagen nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* Alternatively, provided that this notice is retained in full, this
* software may be distributed under the terms of the GNU General
* Public License ("GPL") version 2, in which case the provisions of the
* GPL apply INSTEAD OF those given above.
*
* The provided data structures and external interfaces from this code
* are not restricted to be used by modules with a GPL compatible license.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* Send feedback to <linux-can@vger.kernel.org>
*
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <linux/can.h>
#include <linux/can/error.h>
#include <sys/socket.h> /* for sa_family_t */
#include "lib.h"
#define CANID_DELIM '#'
#define CC_DLC_DELIM '_'
#define XL_HDR_DELIM ':'
#define DATA_SEPERATOR '.'
const char hex_asc_upper[] = "0123456789ABCDEF";
#define hex_asc_upper_lo(x) hex_asc_upper[((x)&0x0F)]
#define hex_asc_upper_hi(x) hex_asc_upper[((x)&0xF0) >> 4]
static inline void put_hex_byte(char *buf, __u8 byte)
{
buf[0] = hex_asc_upper_hi(byte);
buf[1] = hex_asc_upper_lo(byte);
}
static inline void _put_id(char *buf, int end_offset, canid_t id)
{
/* build 3 (SFF) or 8 (EFF) digit CAN identifier */
while (end_offset >= 0) {
buf[end_offset--] = hex_asc_upper_lo(id);
id >>= 4;
}
}
#define put_sff_id(buf, id) _put_id(buf, 2, id)
#define put_eff_id(buf, id) _put_id(buf, 7, id)
/* CAN DLC to real data length conversion helpers */
static const unsigned char dlc2len[] = {0, 1, 2, 3, 4, 5, 6, 7,
8, 12, 16, 20, 24, 32, 48, 64};
/* get data length from raw data length code (DLC) */
unsigned char can_fd_dlc2len(unsigned char dlc)
{
return dlc2len[dlc & 0x0F];
}
static const unsigned char len2dlc[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, /* 0 - 8 */
9, 9, 9, 9, /* 9 - 12 */
10, 10, 10, 10, /* 13 - 16 */
11, 11, 11, 11, /* 17 - 20 */
12, 12, 12, 12, /* 21 - 24 */
13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */
14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */
14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */
15, 15, 15, 15, 15, 15, 15, 15, /* 49 - 56 */
15, 15, 15, 15, 15, 15, 15, 15}; /* 57 - 64 */
/* map the sanitized data length to an appropriate data length code */
unsigned char can_fd_len2dlc(unsigned char len)
{
if (len > 64)
return 0xF;
return len2dlc[len];
}
unsigned char asc2nibble(char c)
{
if ((c >= '0') && (c <= '9'))
return c - '0';
if ((c >= 'A') && (c <= 'F'))
return c - 'A' + 10;
if ((c >= 'a') && (c <= 'f'))
return c - 'a' + 10;
return 16; /* error */
}
int hexstring2data(char *arg, unsigned char *data, int maxdlen)
{
int len = strlen(arg);
int i;
unsigned char tmp;
if (!len || len % 2 || len > maxdlen * 2)
return 1;
memset(data, 0, maxdlen);
for (i = 0; i < len / 2; i++) {
tmp = asc2nibble(*(arg + (2 * i)));
if (tmp > 0x0F)
return 1;
data[i] = (tmp << 4);
tmp = asc2nibble(*(arg + (2 * i) + 1));
if (tmp > 0x0F)
return 1;
data[i] |= tmp;
}
return 0;
}
int parse_canframe(char *cs, cu_t *cu)
{
/* documentation see lib.h */
int i, idx, dlen, len;
int maxdlen = CAN_MAX_DLEN;
int mtu = CAN_MTU;
__u8 *data = cu->fd.data; /* fill CAN CC/FD data by default */
canid_t tmp;
len = strlen(cs);
//printf("'%s' len %d\n", cs, len);
memset(cu, 0, sizeof(*cu)); /* init CAN CC/FD/XL frame, e.g. LEN = 0 */
if (len < 4)
return 0;
if (cs[3] == CANID_DELIM) { /* 3 digits SFF */
idx = 4;
for (i = 0; i < 3; i++) {
if ((tmp = asc2nibble(cs[i])) > 0x0F)
return 0;
cu->cc.can_id |= tmp << (2 - i) * 4;
}
} else if (cs[5] == CANID_DELIM) { /* 5 digits CAN XL VCID/PRIO*/
idx = 6;
for (i = 0; i < 5; i++) {
if ((tmp = asc2nibble(cs[i])) > 0x0F)
return 0;
cu->xl.prio |= tmp << (4 - i) * 4;
}
/* the VCID starts at bit position 16 */
tmp = (cu->xl.prio << 4) & CANXL_VCID_MASK;
cu->xl.prio &= CANXL_PRIO_MASK;
cu->xl.prio |= tmp;
} else if (cs[8] == CANID_DELIM) { /* 8 digits EFF */
idx = 9;
for (i = 0; i < 8; i++) {
if ((tmp = asc2nibble(cs[i])) > 0x0F)
return 0;
cu->cc.can_id |= tmp << (7 - i) * 4;
}
if (!(cu->cc.can_id & CAN_ERR_FLAG)) /* 8 digits but no errorframe? */
cu->cc.can_id |= CAN_EFF_FLAG; /* then it is an extended frame */
} else
return 0;
if ((cs[idx] == 'R') || (cs[idx] == 'r')) { /* RTR frame */
cu->cc.can_id |= CAN_RTR_FLAG;
/* check for optional DLC value for CAN 2.0B frames */
if (cs[++idx] && (tmp = asc2nibble(cs[idx++])) <= CAN_MAX_DLEN) {
cu->cc.len = tmp;
/* check for optional raw DLC value for CAN 2.0B frames */
if ((tmp == CAN_MAX_DLEN) && (cs[idx++] == CC_DLC_DELIM)) {
tmp = asc2nibble(cs[idx]);
if ((tmp > CAN_MAX_DLEN) && (tmp <= CAN_MAX_RAW_DLC))
cu->cc.len8_dlc = tmp;
}
}
return mtu;
}
if (cs[idx] == CANID_DELIM) { /* CAN FD frame escape char '##' */
maxdlen = CANFD_MAX_DLEN;
mtu = CANFD_MTU;
/* CAN FD frame <canid>##<flags><data>* */
if ((tmp = asc2nibble(cs[idx + 1])) > 0x0F)
return 0;
cu->fd.flags = tmp;
cu->fd.flags |= CANFD_FDF; /* dual-use */
idx += 2;
} else if (cs[idx + 14] == CANID_DELIM) { /* CAN XL frame '#80:00:11223344#' */
maxdlen = CANXL_MAX_DLEN;
mtu = CANXL_MTU;
data = cu->xl.data; /* fill CAN XL data */
if ((cs[idx + 2] != XL_HDR_DELIM) || (cs[idx + 5] != XL_HDR_DELIM))
return 0;
if ((tmp = asc2nibble(cs[idx++])) > 0x0F)
return 0;
cu->xl.flags = tmp << 4;
if ((tmp = asc2nibble(cs[idx++])) > 0x0F)
return 0;
cu->xl.flags |= tmp;
/* force CAN XL flag if it was missing in the ASCII string */
cu->xl.flags |= CANXL_XLF;
idx++; /* skip XL_HDR_DELIM */
if ((tmp = asc2nibble(cs[idx++])) > 0x0F)
return 0;
cu->xl.sdt = tmp << 4;
if ((tmp = asc2nibble(cs[idx++])) > 0x0F)
return 0;
cu->xl.sdt |= tmp;
idx++; /* skip XL_HDR_DELIM */
for (i = 0; i < 8; i++) {
if ((tmp = asc2nibble(cs[idx++])) > 0x0F)
return 0;
cu->xl.af |= tmp << (7 - i) * 4;
}
idx++; /* skip CANID_DELIM */
}
for (i = 0, dlen = 0; i < maxdlen; i++) {
if (cs[idx] == DATA_SEPERATOR) /* skip (optional) separator */
idx++;
if (idx >= len) /* end of string => end of data */
break;
if ((tmp = asc2nibble(cs[idx++])) > 0x0F)
return 0;
data[i] = tmp << 4;
if ((tmp = asc2nibble(cs[idx++])) > 0x0F)
return 0;
data[i] |= tmp;
dlen++;
}
if (mtu == CANXL_MTU)
cu->xl.len = dlen;
else
cu->fd.len = dlen;
/* check for extra DLC when having a Classic CAN with 8 bytes payload */
if ((maxdlen == CAN_MAX_DLEN) && (dlen == CAN_MAX_DLEN) && (cs[idx++] == CC_DLC_DELIM)) {
unsigned char dlc = asc2nibble(cs[idx]);
if ((dlc > CAN_MAX_DLEN) && (dlc <= CAN_MAX_RAW_DLC))
cu->cc.len8_dlc = dlc;
}
return mtu;
}
int snprintf_canframe(char *buf, size_t size, cu_t *cu, int sep)
{
/* documentation see lib.h */
unsigned char is_canfd = cu->fd.flags;
int i, offset;
int len;
/* ensure space for string termination */
if (size < 1)
return size;
/* handle CAN XL frames */
if (cu->xl.flags & CANXL_XLF) {
len = cu->xl.len;
/* check if the CAN frame fits into the provided buffer */
if (sizeof("00123#11:22:12345678#") + 2 * len + (sep ? len : 0) > size - 1) {
/* mark buffer overflow in output */
memset(buf, '-', size - 1);
buf[size - 1] = 0;
return size;
}
/* print prio and CAN XL header content */
offset = sprintf(buf, "%02X%03X#%02X:%02X:%08X#",
(canid_t)(cu->xl.prio & CANXL_VCID_MASK) >> CANXL_VCID_OFFSET,
(canid_t)(cu->xl.prio & CANXL_PRIO_MASK),
cu->xl.flags, cu->xl.sdt, cu->xl.af);
/* data */
for (i = 0; i < len; i++) {
put_hex_byte(buf + offset, cu->xl.data[i]);
offset += 2;
if (sep && (i + 1 < len))
buf[offset++] = '.';
}
buf[offset] = 0;
return offset;
}
/* handle CAN CC/FD frames - ensure max length values */
if (is_canfd)
len = (cu->fd.len > CANFD_MAX_DLEN) ? CANFD_MAX_DLEN : cu->fd.len;
else
len = (cu->fd.len > CAN_MAX_DLEN) ? CAN_MAX_DLEN : cu->fd.len;
/* check if the CAN frame fits into the provided buffer */
if (sizeof("12345678#_F") + 2 * len + (sep ? len : 0) + \
(cu->fd.can_id & CAN_RTR_FLAG ? 2 : 0) > size - 1) {
/* mark buffer overflow in output */
memset(buf, '-', size - 1);
buf[size - 1] = 0;
return size;
}
if (cu->fd.can_id & CAN_ERR_FLAG) {
put_eff_id(buf, cu->fd.can_id & (CAN_ERR_MASK | CAN_ERR_FLAG));
buf[8] = '#';
offset = 9;
} else if (cu->fd.can_id & CAN_EFF_FLAG) {
put_eff_id(buf, cu->fd.can_id & CAN_EFF_MASK);
buf[8] = '#';
offset = 9;
} else {
put_sff_id(buf, cu->fd.can_id & CAN_SFF_MASK);
buf[3] = '#';
offset = 4;
}
/* CAN CC frames may have RTR enabled. There are no ERR frames with RTR */
if (!is_canfd && cu->fd.can_id & CAN_RTR_FLAG) {
buf[offset++] = 'R';
/* print a given CAN 2.0B DLC if it's not zero */
if (len && len <= CAN_MAX_DLEN) {
buf[offset++] = hex_asc_upper_lo(cu->fd.len);
/* check for optional raw DLC value for CAN 2.0B frames */
if (len == CAN_MAX_DLEN) {
if ((cu->cc.len8_dlc > CAN_MAX_DLEN) && (cu->cc.len8_dlc <= CAN_MAX_RAW_DLC)) {
buf[offset++] = CC_DLC_DELIM;
buf[offset++] = hex_asc_upper_lo(cu->cc.len8_dlc);
}
}
}
buf[offset] = 0;
return offset;
}
/* any CAN FD flags */
if (is_canfd) {
/* add CAN FD specific escape char and flags */
buf[offset++] = '#';
buf[offset++] = hex_asc_upper_lo(cu->fd.flags);
if (sep && len)
buf[offset++] = '.';
}
/* data */
for (i = 0; i < len; i++) {
put_hex_byte(buf + offset, cu->fd.data[i]);
offset += 2;
if (sep && (i + 1 < len))
buf[offset++] = '.';
}
/* check for extra DLC when having a Classic CAN with 8 bytes payload */
if (!is_canfd && (len == CAN_MAX_DLEN)) {
unsigned char dlc = cu->cc.len8_dlc;
if ((dlc > CAN_MAX_DLEN) && (dlc <= CAN_MAX_RAW_DLC)) {
buf[offset++] = CC_DLC_DELIM;
buf[offset++] = hex_asc_upper_lo(dlc);
}
}
buf[offset] = 0;
return offset;
}
int snprintf_long_canframe(char *buf, size_t size, cu_t *cu, int view)
{
/* documentation see lib.h */
unsigned char is_canfd = cu->fd.flags;
int i, j, dlen, offset;
size_t maxsize;
int len;
/* ensure space for string termination */
if (size < 1)
return size;
/* handle CAN XL frames */
if (cu->xl.flags & CANXL_XLF) {
len = cu->xl.len;
/* crop to CANFD_MAX_DLEN */
if (len > CANFD_MAX_DLEN)
dlen = CANFD_MAX_DLEN;
else
dlen = len;
/* check if the CAN frame fits into the provided buffer */
if (sizeof(".....123 [2048] (00|11:22:12345678) ...") + 3 * dlen > size - 1) {
/* mark buffer overflow in output */
memset(buf, '-', size - 1);
buf[size - 1] = 0;
return size;
}
if (view & CANLIB_VIEW_INDENT_SFF) {
memset(buf, ' ', 5);
put_sff_id(buf + 5, cu->xl.prio & CANXL_PRIO_MASK);
offset = 8;
} else {
put_sff_id(buf, cu->xl.prio & CANXL_PRIO_MASK);
offset = 3;
}
/* print prio and CAN XL header content */
offset += sprintf(buf + offset, " [%04d] (%02X|%02X:%02X:%08X) ",
len,
(canid_t)(cu->xl.prio & CANXL_VCID_MASK) >> CANXL_VCID_OFFSET,
cu->xl.flags, cu->xl.sdt, cu->xl.af);
for (i = 0; i < dlen; i++) {
put_hex_byte(buf + offset, cu->xl.data[i]);
offset += 2;
if (i + 1 < dlen)
buf[offset++] = ' ';
}
/* indicate cropped output */
if (cu->xl.len > dlen)
offset += sprintf(buf + offset, " ...");
buf[offset] = 0;
return offset;
}
/* ensure max length values */
if (is_canfd)
len = (cu->fd.len > CANFD_MAX_DLEN) ? CANFD_MAX_DLEN : cu->fd.len;
else
len = (cu->fd.len > CAN_MAX_DLEN) ? CAN_MAX_DLEN : cu->fd.len;
/* check if the CAN frame fits into the provided buffer */
maxsize = sizeof("12345678 [12] ");
if (view & CANLIB_VIEW_BINARY)
dlen = 9; /* _10101010 */
else
dlen = 3; /* _AA */
if (cu->fd.can_id & CAN_RTR_FLAG) {
maxsize += sizeof(" remote request");
} else {
maxsize += len * dlen;
if (len <= CAN_MAX_DLEN) {
if (cu->fd.can_id & CAN_ERR_FLAG) {
maxsize += sizeof(" ERRORFRAME");
maxsize += (8 - len) * dlen;
} else if (view & CANLIB_VIEW_ASCII) {
maxsize += sizeof(" 'a.b.CDEF'");
maxsize += (8 - len) * dlen;
}
}
}
if (maxsize > size - 1) {
/* mark buffer overflow in output */
memset(buf, '-', size - 1);
buf[size - 1] = 0;
return size;
}
/* initialize space for CAN-ID and length information */
memset(buf, ' ', 15);
if (cu->cc.can_id & CAN_ERR_FLAG) {
put_eff_id(buf, cu->cc.can_id & (CAN_ERR_MASK | CAN_ERR_FLAG));
offset = 10;
} else if (cu->fd.can_id & CAN_EFF_FLAG) {
put_eff_id(buf, cu->fd.can_id & CAN_EFF_MASK);
offset = 10;
} else {
if (view & CANLIB_VIEW_INDENT_SFF) {
put_sff_id(buf + 5, cu->fd.can_id & CAN_SFF_MASK);
offset = 10;
} else {
put_sff_id(buf, cu->fd.can_id & CAN_SFF_MASK);
offset = 5;
}
}
/* The len value is sanitized (see above) */
if (!is_canfd) {
if (view & CANLIB_VIEW_LEN8_DLC) {
unsigned char dlc = cu->cc.len8_dlc;
/* fall back to len if we don't have a valid DLC > 8 */
if (!((len == CAN_MAX_DLEN) && (dlc > CAN_MAX_DLEN) &&
(dlc <= CAN_MAX_RAW_DLC)))
dlc = len;
buf[offset + 1] = '{';
buf[offset + 2] = hex_asc_upper[dlc];
buf[offset + 3] = '}';
} else {
buf[offset + 1] = '[';
buf[offset + 2] = len + '0';
buf[offset + 3] = ']';
}
/* standard CAN frames may have RTR enabled */
if (cu->fd.can_id & CAN_RTR_FLAG) {
offset += sprintf(buf + offset + 5, " remote request");
return offset + 5;
}
} else {
buf[offset] = '[';
buf[offset + 1] = (len / 10) + '0';
buf[offset + 2] = (len % 10) + '0';
buf[offset + 3] = ']';
}
offset += 5;
if (view & CANLIB_VIEW_BINARY) {
/* _10101010 - dlen = 9, see above */
if (view & CANLIB_VIEW_SWAP) {
for (i = len - 1; i >= 0; i--) {
buf[offset++] = (i == len - 1) ? ' ' : SWAP_DELIMITER;
for (j = 7; j >= 0; j--)
buf[offset++] = (1 << j & cu->fd.data[i]) ? '1' : '0';
}
} else {
for (i = 0; i < len; i++) {
buf[offset++] = ' ';
for (j = 7; j >= 0; j--)
buf[offset++] = (1 << j & cu->fd.data[i]) ? '1' : '0';
}
}
} else {
/* _AA - dlen = 3, see above */
if (view & CANLIB_VIEW_SWAP) {
for (i = len - 1; i >= 0; i--) {
if (i == len - 1)
buf[offset++] = ' ';
else
buf[offset++] = SWAP_DELIMITER;
put_hex_byte(buf + offset, cu->fd.data[i]);
offset += 2;
}
} else {
for (i = 0; i < len; i++) {
buf[offset++] = ' ';
put_hex_byte(buf + offset, cu->fd.data[i]);
offset += 2;
}
}
}
buf[offset] = 0; /* terminate string */
/*
* The ASCII & ERRORFRAME output is put at a fixed len behind the data.
* For now we support ASCII output only for payload length up to 8 bytes.
* Does it make sense to write 64 ASCII byte behind 64 ASCII HEX data on the console?
*/
if (len > CAN_MAX_DLEN)
return offset;
if (cu->fd.can_id & CAN_ERR_FLAG)
offset += sprintf(buf + offset, "%*s", dlen * (8 - len) + 13, "ERRORFRAME");
else if (view & CANLIB_VIEW_ASCII) {
j = dlen * (8 - len) + 4;
if (view & CANLIB_VIEW_SWAP) {
sprintf(buf + offset, "%*s", j, "`");
offset += j;
for (i = len - 1; i >= 0; i--)
if ((cu->fd.data[i] > 0x1F) && (cu->fd.data[i] < 0x7F))
buf[offset++] = cu->fd.data[i];
else
buf[offset++] = '.';
offset += sprintf(buf + offset, "`");
} else {
sprintf(buf + offset, "%*s", j, "'");
offset += j;
for (i = 0; i < len; i++)
if ((cu->fd.data[i] > 0x1F) && (cu->fd.data[i] < 0x7F))
buf[offset++] = cu->fd.data[i];
else
buf[offset++] = '.';
offset += sprintf(buf + offset, "'");
}
}
return offset;
}
static const char *error_classes[] = {
"tx-timeout",
"lost-arbitration",
"controller-problem",
"protocol-violation",
"transceiver-status",
"no-acknowledgement-on-tx",
"bus-off",
"bus-error",
"restarted-after-bus-off",
"error-counter-tx-rx",
};
static const char *controller_problems[] = {
"rx-overflow",
"tx-overflow",
"rx-error-warning",
"tx-error-warning",
"rx-error-passive",
"tx-error-passive",
"back-to-error-active",
};
static const char *protocol_violation_types[] = {
"single-bit-error",
"frame-format-error",
"bit-stuffing-error",
"tx-dominant-bit-error",
"tx-recessive-bit-error",
"bus-overload",
"active-error",
"error-on-tx",
};
static const char *protocol_violation_locations[] = {
"unspecified",
"unspecified",
"id.28-to-id.21",
"start-of-frame",
"bit-srtr",
"bit-ide",
"id.20-to-id.18",
"id.17-to-id.13",
"crc-sequence",
"reserved-bit-0",
"data-field",
"data-length-code",
"bit-rtr",
"reserved-bit-1",
"id.4-to-id.0",
"id.12-to-id.5",
"unspecified",
"active-error-flag",
"intermission",
"tolerate-dominant-bits",
"unspecified",
"unspecified",
"passive-error-flag",
"error-delimiter",
"crc-delimiter",
"acknowledge-slot",
"end-of-frame",
"acknowledge-delimiter",
"overload-flag",
"unspecified",
"unspecified",
"unspecified",
};
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
#endif
static int snprintf_error_data(char *buf, size_t len, uint8_t err,
const char **arr, int arr_len)
{
int i, n = 0, count = 0;
if (!err || len <= 0)
return 0;
for (i = 0; i < arr_len; i++) {
if (err & (1 << i)) {
int tmp_n = 0;
if (count) {
/* Fix for potential buffer overflow https://lgtm.com/rules/1505913226124/ */
tmp_n = snprintf(buf + n, len - n, ",");
if (tmp_n < 0 || (size_t)tmp_n >= len - n) {
return n;
}
n += tmp_n;
}
tmp_n = snprintf(buf + n, len - n, "%s", arr[i]);
if (tmp_n < 0 || (size_t)tmp_n >= len - n) {
return n;
}
n += tmp_n;
count++;
}
}
return n;
}
static int snprintf_error_lostarb(char *buf, size_t len, const struct canfd_frame *cf)
{
if (len <= 0)
return 0;
return snprintf(buf, len, "{at bit %d}", cf->data[0]);
}
static int snprintf_error_ctrl(char *buf, size_t len, const struct canfd_frame *cf)
{
int n = 0;
if (len <= 0)
return 0;
n += snprintf(buf + n, len - n, "{");
n += snprintf_error_data(buf + n, len - n, cf->data[1],
controller_problems,
ARRAY_SIZE(controller_problems));
n += snprintf(buf + n, len - n, "}");
return n;
}
static int snprintf_error_prot(char *buf, size_t len, const struct canfd_frame *cf)
{
int n = 0;
if (len <= 0)
return 0;
n += snprintf(buf + n, len - n, "{{");
n += snprintf_error_data(buf + n, len - n, cf->data[2],
protocol_violation_types,
ARRAY_SIZE(protocol_violation_types));
n += snprintf(buf + n, len - n, "}{");
if (cf->data[3] > 0 &&
cf->data[3] < ARRAY_SIZE(protocol_violation_locations))
n += snprintf(buf + n, len - n, "%s",
protocol_violation_locations[cf->data[3]]);
n += snprintf(buf + n, len - n, "}}");
return n;
}
static int snprintf_error_cnt(char *buf, size_t len, const struct canfd_frame *cf)
{
int n = 0;
if (len <= 0)
return 0;
n += snprintf(buf + n, len - n, "{{%d}{%d}}",
cf->data[6], cf->data[7]);
return n;
}
int snprintf_can_error_frame(char *buf, size_t len, const struct canfd_frame *cf,
const char* sep)
{
canid_t class, mask;
int i, n = 0, classes = 0;
char *defsep = ",";
if (!(cf->can_id & CAN_ERR_FLAG))
return 0;
class = cf->can_id & CAN_EFF_MASK;
if (class > (1 << ARRAY_SIZE(error_classes))) {
fprintf(stderr, "Error class %#x is invalid\n", class);
return 0;
}
if (!sep)
sep = defsep;
for (i = 0; i < (int)ARRAY_SIZE(error_classes); i++) {
mask = 1 << i;
if (class & mask) {
int tmp_n = 0;
if (classes) {
/* Fix for potential buffer overflow https://lgtm.com/rules/1505913226124/ */
tmp_n = snprintf(buf + n, len - n, "%s", sep);
if (tmp_n < 0 || (size_t)tmp_n >= len - n) {
buf[0] = 0; /* empty terminated string */
return 0;
}
n += tmp_n;
}
tmp_n = snprintf(buf + n, len - n, "%s", error_classes[i]);
if (tmp_n < 0 || (size_t)tmp_n >= len - n) {
buf[0] = 0; /* empty terminated string */
return 0;
}
n += tmp_n;
if (mask == CAN_ERR_LOSTARB)
n += snprintf_error_lostarb(buf + n, len - n,
cf);
if (mask == CAN_ERR_CRTL)
n += snprintf_error_ctrl(buf + n, len - n, cf);
if (mask == CAN_ERR_PROT)
n += snprintf_error_prot(buf + n, len - n, cf);
if (mask == CAN_ERR_CNT)
n += snprintf_error_cnt(buf + n, len - n, cf);
classes++;
}
}
if (!(cf->can_id & CAN_ERR_CNT) && (cf->data[6] || cf->data[7])) {
n += snprintf(buf + n, len - n, "%serror-counter-tx-rx", sep);
n += snprintf_error_cnt(buf + n, len - n, cf);
}
return n;
}
int64_t timespec_diff_ms(struct timespec *ts1,
struct timespec *ts2)
{
int64_t diff = (ts1->tv_sec - ts2->tv_sec) * 1000;
diff += (ts1->tv_nsec - ts2->tv_nsec) / 1000000;
return diff;
}
void timespec_add_ms(struct timespec *ts, uint64_t milliseconds)
{
uint64_t total_ns = ts->tv_nsec + (milliseconds * 1000000);
ts->tv_sec += total_ns / 1000000000;
ts->tv_nsec = total_ns % 1000000000;
}
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