/*
 * hex - a simple hex file viewer
 * (c) John Donoghue, 1997.
 *-------------------------------
 * Version: 1.0
 * Licence: GPL - Use and modify as 
 *          per the GPL licence,
 */

#include <stdio.h>

#define MAX_HEX	16

void DisplayHex(unsigned char *string,int size);
void DisplayChar(unsigned char *string,int size);

int main(int argc,char **argv)
{
	FILE *file;
	unsigned long address=0;
	unsigned char buffer[16];
	int i;

	if(argc<2) {
		printf("HEX V1.00 (c) John Donoghue\n");
		printf("Displays a hex dump of a file.\n");
		printf("Usage: %s [file]\n",argv[0]);
		exit(0);
	}
	file=fopen(argv[1],"r+b");
	if(!file) {
		printf("Can't open file %s.\n",argv[1]);
		exit(0);
	}

	i=fread(buffer,1,MAX_HEX,file);
	while(i!=0) {
		printf("%08lx ",address);
		DisplayHex(buffer,i);
		printf("  ");
		DisplayChar(buffer,i);
		address+=i;
		printf("\n");
		i=fread(buffer,1,MAX_HEX,file);
	}

	fclose(file);
	return(0);
}

void DisplayHex(unsigned char *string,int size)
{
	int i;
	for(i=0;i<MAX_HEX;i++) {
		if(i<size) printf("%02x ",(int)string[i]);
		else printf("   ");
	}
	return;
}

void DisplayChar(unsigned char *string,int size)
{
	int i;
	for(i=0;i<MAX_HEX;i++) {
		if(i<size) {
			if(string[i]>=0x20 && string[i]<127) printf("%c",(int)string[i]);
			else printf(".");
		}
		else printf(" ");
	}
	return;
}