diffchars.c

/*
 * Copyright (c) 2018 Kristaps Dzonsons <kristaps@bsd.lv>
 * 
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include "config.h"

#ifdef HAVE_ERR
# include <err.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "diff.h"

static int
char_cmp(const void *p1, const void *p2)
{

	return *(const char *)p1 == *(const char *)p2;
}

int 
main(int argc, char *argv[]) 
{
	size_t	 	 i;
	int		 rc;
	struct diff	 p;

	if (argc < 3) {
		fprintf(stderr, "usage: %s origin target\n", 
			getprogname());
		return EXIT_FAILURE;
	}

	rc = diff(&p, char_cmp, sizeof(char), 
		argv[1], strlen(argv[1]), 
		argv[2], strlen(argv[2]));

	if (rc < 0)
		err(EXIT_FAILURE, NULL);
	if (0 == rc)
		errx(EXIT_FAILURE, "cannot compute difference");

	puts("Shortest edit script:");
	for (i = 0; i < p.sessz; i++)
		printf("%s%c\n",
			DIFF_ADD == p.ses[i].type ?  "+" :
			DIFF_DELETE == p.ses[i].type ?  "-" : " ",
			*(const char *)p.ses[i].e);

	printf("Longest common subsequence: ");
	for (i = 0; i < p.lcssz; i++)
		printf("%c", *(const char *)p.lcs[i]);
	puts("");

	printf("Edit distance: %zu\n", p.editdist);

	free(p.ses);
	free(p.lcs);
	return EXIT_SUCCESS;
}