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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* 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 Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* 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.
*/
#include <unistd.h>
#include <stddef.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#define LINE_LEN 16
static void
dump_line(const char *line, size_t len)
{
/* The amount of bytes we write */
const uint8_t BYTE_COUNT = 2;
for (size_t i = 0; i < LINE_LEN; ++i) {
if (i < len) {
printf("%02x", line[i] & 0xFF);
} else {
printf(" ");
}
/* Put spacing between bytes */
if (((i + 1) % BYTE_COUNT) == 0) {
printf(" ");
}
}
printf(" ");
for (size_t i = 0; i < len; ++i) {
if (line[i] > 31 && line[i] < 127) {
printf("%c", line[i]);
} else {
printf(".");
}
}
printf("\n");
}
static void
dump_file(int fd)
{
char buf[LINE_LEN];
ssize_t count;
size_t offset = 0;
for (;;) {
count = read(fd, buf, sizeof(char) * LINE_LEN);
if (count <= 0) {
break;
}
printf("%08x: ", offset);
offset += LINE_LEN;
dump_line(buf, count);
}
}
int
main(int argc, char **argv)
{
int fd;
if (argc < 2) {
printf("mex: usage: mex <filename>\n");
return -1;
}
if ((fd = open(argv[1], O_RDONLY)) < 0) {
printf("mex: failed to open input\n");
return fd;
}
dump_file(fd);
return 0;
}
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