metalsvm/drivers/net/util.c

#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;
		}
	}
}