/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause) */
/*
 * log2asc.c - convert compact CAN frame logfile to ASC logfile
 *
 * 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 <stdio.h>
#include <string.h>
#include <time.h>
#include <libgen.h>
#include <unistd.h>

#include <net/if.h>
#include <sys/time.h>
#include <linux/can.h>

#include "lib.h"

#define BUFSZ 400 /* for one line in the logfile */

extern int optind, opterr, optopt;

void print_usage(char *prg)
{
	fprintf(stderr, "Usage: %s [can-interfaces]\n", prg);
	fprintf(stderr, "Options: -I <infile>  (default stdin)\n");
	fprintf(stderr, "         -O <outfile> (default stdout)\n");
	fprintf(stderr, "         -4 (reduce decimal place to 4 digits)\n");
	fprintf(stderr, "         -n (set newline to cr/lf - default lf)\n");
}

int main(int argc, char **argv)
{
	static char buf[BUFSZ], device[BUFSZ], ascframe[BUFSZ], id[10];

	struct canfd_frame cf;
	static struct timeval tv, start_tv;
	FILE *infile = stdin;
	FILE *outfile = stdout;
	static int maxdev, devno, i, crlf, d4, opt;

	while ((opt = getopt(argc, argv, "I:O:4n?")) != -1) {
		switch (opt) {
		case 'I':
			infile = fopen(optarg, "r");
			if (!infile) {
				perror("infile");
				return 1;
			}
			break;

		case 'O':
			outfile = fopen(optarg, "w");
			if (!outfile) {
				perror("outfile");
				return 1;
			}
			break;

		case 'n':
			crlf = 1;
			break;

		case '4':
			d4 = 1;
			break;

		case '?':
			print_usage(basename(argv[0]));
			return 0;
			break;

		default:
			fprintf(stderr, "Unknown option %c\n", opt);
			print_usage(basename(argv[0]));
			return 1;
			break;
		}
	}

	maxdev = argc - optind; /* find real number of CAN devices */

	if (!maxdev) {
		fprintf(stderr, "no CAN interfaces defined!\n");
		print_usage(basename(argv[0]));
		return 1;
	}
	
	//printf("Found %d CAN devices!\n", maxdev);

	while (fgets(buf, BUFSZ-1, infile)) {

		if (strlen(buf) >= BUFSZ-2) {
			fprintf(stderr, "line too long for input buffer\n");
			return 1;
		}

		/* check for a comment line */
		if (buf[0] != '(')
			continue;

		if (sscanf(buf, "(%ld.%ld) %s %s", &tv.tv_sec, &tv.tv_usec,
			   device, ascframe) != 4) {
			fprintf(stderr, "incorrect line format in logfile\n");
			return 1;
		}

		if (!start_tv.tv_sec) { /* print banner */
			start_tv = tv;
			fprintf(outfile, "date %s", ctime(&start_tv.tv_sec));
			fprintf(outfile, "base hex  timestamps absolute%s",
				(crlf)?"\r\n":"\n");
			fprintf(outfile, "no internal events logged%s",
				(crlf)?"\r\n":"\n");
		}

		for (i=0, devno=0; i<maxdev; i++) {
			if (!strcmp(device, argv[optind+i])) {
				devno = i+1; /* start with channel '1' */
				break;
			}
		}

		if (devno) { /* only convert for selected CAN devices */
			if (parse_canframe(ascframe, &cf) != CAN_MTU) /* no CAN FD support so far */
				return 1;

			tv.tv_sec  = tv.tv_sec - start_tv.tv_sec;
			tv.tv_usec = tv.tv_usec - start_tv.tv_usec;
			if (tv.tv_usec < 0)
				tv.tv_sec--, tv.tv_usec += 1000000;
			if (tv.tv_sec < 0)
				tv.tv_sec = tv.tv_usec = 0;

			if (d4)
				fprintf(outfile, "%4ld.%04ld ", tv.tv_sec, tv.tv_usec/100);
			else
				fprintf(outfile, "%4ld.%06ld ", tv.tv_sec, tv.tv_usec);

			fprintf(outfile, "%-2d ", devno); /* channel number left aligned */

			if (cf.can_id & CAN_ERR_FLAG)
				fprintf(outfile, "ErrorFrame");
			else {
				sprintf(id, "%X%c", cf.can_id & CAN_EFF_MASK,
					(cf.can_id & CAN_EFF_FLAG)?'x':' ');
				fprintf(outfile, "%-15s Rx   ", id);
		
				if (cf.can_id & CAN_RTR_FLAG)
					fprintf(outfile, "r"); /* RTR frame */
				else {
					fprintf(outfile, "d %d", cf.len); /* data frame */
		    
					for (i = 0; i < cf.len; i++) {
						fprintf(outfile, " %02X", cf.data[i]);
					}
				}
			}
			if (crlf)
				fprintf(outfile, "\r");
			fprintf(outfile, "\n");
		}
	}
	fflush(outfile);
	fclose(outfile);
	fclose(infile);

	return 0;
}
