metalsvm/drivers/net/util.c

/* 
 * Copyright 2011 Carl-Benedikt Krueger, Chair for Operating Systems,
 *                                       RWTH Aachen University
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * This file is part of MetalSVM. 
 */

#include "util.h"


__inline int isprint(char e)
{
	if (e < 0x30 || e > 0x80)
		return 0;
}

// hex_dumb display network packets in a good way
void hex_dump(unsigned n, const unsigned char* buf)
{
	int on_this_line = 0;

	while (n-- > 0) 
	{
		kprintf("%02X ", *buf++);
		on_this_line += 1;
		if (on_this_line == 16 || n == 0) 
		{
			int i;
			
			kputs(" ");

			for (i = on_this_line; i < 16; i++)
				kputs(" ");
			
			for (i = on_this_line; i > 0; i--)
				kputchar(isprint(buf[-i]) ? buf[-i] : '.');
			
			kputs("\n");
			on_this_line = 0;
		}
	}
}