others
/* $Id$ */
/* Copyright (c) 2006-2014 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS Unix others */
/* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#ifndef PROGNAME
# define PROGNAME "hexdump"
#endif
/* hexdump */
/* private */
/* prototypes */
static int _hexdump(int filec, char * filev[]);
static int _hexdump_error(char const * message, int ret);
static int _hexdump_usage(void);
/* functions */
/* hexdump */
static int _hexdump_do(char * filename);
static int _hexdump(int filec, char * filev[])
{
int ret = 0;
int i;
for(i = 0; i < filec; i++)
ret |= _hexdump_do(filev[i]);
return ret;
}
static int _hexdump_do(char * filename)
{
int ret = 0;
FILE * fp;
int c;
int pos = 0;
char buf[17] = "";
if((fp = fopen(filename, "r")) == NULL)
return _hexdump_error(filename, 1);
while((c = fgetc(fp)) != EOF)
{
if(pos % 16 == 0)
printf("%08x ", pos);
else if(pos % 16 == 8)
fputc(' ', stdout);
printf(" %02x", (unsigned char)c);
buf[pos % 16] = isprint(c) ? c : '.';
if(++pos % 16 == 0)
printf(" |%s|\n", buf);
}
buf[pos % 16] = '\0';
if(pos % 16 != 0)
{
if(pos % 16 <= 8)
fputc(' ', stdout);
for(c = pos % 16; c < 16; c++)
printf("%s", " ");
printf(" |%s|\n", buf);
}
if(!feof(fp))
ret = _hexdump_error(filename, 1);
fclose(fp);
return ret;
}
/* hexdump_error */
static int _hexdump_error(char const * message, int ret)
{
fputs(PROGNAME ": ", stderr);
perror(message);
return ret;
}
/* hexdump_usage */
static int _hexdump_usage(void)
{
fputs("Usage: " PROGNAME " file\n", stderr);
return 1;
}
/* public */
/* functions */
/* main */
int main(int argc, char * argv[])
{
int o;
while((o = getopt(argc, argv, "")) != -1)
switch(o)
{
default:
return _hexdump_usage();
}
if(optind + 1 != argc)
return _hexdump_usage();
return (_hexdump(argc - optind, &argv[optind]) == 0) ? 0 : 2;
}