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// SPDX-License-Identifier: CDDL-1.0
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2024 by Pawel Jakub Dawidek
*/
#include <sys/mman.h>
#include <sys/stat.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef __FreeBSD__
#define loff_t off_t
#endif
ssize_t
copy_file_range(int, loff_t *, int, loff_t *, size_t, unsigned int)
__attribute__((weak));
static void *
mmap_file(int fd, size_t size)
{
void *p;
p = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
if (p == MAP_FAILED) {
(void) fprintf(stderr, "mmap failed: %s\n", strerror(errno));
exit(2);
}
return (p);
}
static void
usage(const char *progname)
{
/*
* -i cache input before copy_file_range(2).
* -o cache input before copy_file_range(2).
*/
(void) fprintf(stderr, "usage: %s [-io] <input> <output>\n", progname);
exit(3);
}
int
main(int argc, char *argv[])
{
int dfd, sfd;
size_t dsize, ssize;
void *dmem, *smem, *ptr;
off_t doff, soff;
struct stat sb;
bool cache_input, cache_output;
const char *progname;
int c;
progname = argv[0];
cache_input = cache_output = false;
while ((c = getopt(argc, argv, "io")) != -1) {
switch (c) {
case 'i':
cache_input = true;
break;
case 'o':
cache_output = true;
break;
default:
usage(progname);
}
}
argc -= optind;
argv += optind;
if (argc != 2) {
usage(progname);
}
sfd = open(argv[0], O_RDONLY);
if (fstat(sfd, &sb) == -1) {
(void) fprintf(stderr, "fstat failed: %s\n", strerror(errno));
exit(2);
}
ssize = sb.st_size;
smem = mmap_file(sfd, ssize);
dfd = open(argv[1], O_RDWR);
if (fstat(dfd, &sb) == -1) {
(void) fprintf(stderr, "fstat failed: %s\n", strerror(errno));
exit(2);
}
dsize = sb.st_size;
dmem = mmap_file(dfd, dsize);
/*
* Hopefully it won't be compiled out.
*/
if (cache_input) {
ptr = malloc(ssize);
assert(ptr != NULL);
memcpy(ptr, smem, ssize);
free(ptr);
}
if (cache_output) {
ptr = malloc(ssize);
assert(ptr != NULL);
memcpy(ptr, dmem, dsize);
free(ptr);
}
soff = doff = 0;
if (copy_file_range(sfd, &soff, dfd, &doff, ssize, 0) < 0) {
(void) fprintf(stderr, "copy_file_range failed: %s\n",
strerror(errno));
exit(2);
}
exit(memcmp(smem, dmem, ssize) == 0 ? 0 : 1);
}
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