/****************************************************************
 *	Module name  :	compare.c                               *
 *	Purpose      :	Compares two files & reports errors     *
 *	Created      :	??-??-89				* 
 *	Last edited  : 	24-08-89		Version 1.0	*
 * 	Copyright    :	G R Buckeridge				*
 ****************************************************************/


#include stdio.h
#define MAXINT 32767

main(argc,argv)
int argc;
char *argv[];

	{

	FAST char argv_buffer[MAXARGS * 2 +132];
	FILE *in1,*in2;
	int start,addr,ch1,ch2,fail,first;
	
		
	cpm_cmd_line (&argc,&argv,argv_buffer); /* for reading command line */
	
	if (argc==1)
		{
		printf("\n\tThis utility compares two files and reports any differences.\n");
		printf("\n\tIts command line takes the form :- \n");
		printf("\n\t\tCOMPARE FILE1.TXT FILE2.TXT 0\n");
		printf("\n\tThe zero as the last argument denotes the optional start address.\n");
		printf("\n\tIf not included the start address is assumed to be 100 Hex.\n");
		printf("\n\tCan be aborted at any time with ctrl-C.\n");
		exit(0);
		}
		

	if (argc<3 || argc>4)  

		{
		printf("\nBad command line\n");
		exit(0);
		}
	
	in1=fopen(argv[1],"r");
	in2=fopen(argv[2],"r");
			
	if (in1 == NULL)
		{
		printf("\nCan't open file %s\n",argv[1]);
		exit(0);
		}
		
	if (in2 == NULL)
		{
		printf("\nCan't open file %s\n",argv[2]);
		exit(0);
		}
	if (argc==3)	
		addr=0x100;
	else
		addr=atoi(argv[3]);

	start=addr;
	fail=FALSE;
	first=FALSE;
	
	for(;;++addr)
		{
		
		if (keyhit()==TRUE && rawin()==3)
			{
			printf("\nUser Aborted\n");
			exit(0);
			}
			
 		ch1=getc(in1);
		ch2=getc(in2);

		if(ch1==EOF && ch2==EOF)
			break;

		if(ch1==EOF)
			{
			printf("\n%s shorter than %s\n",argv[1],argv[2]);
			break;
			}
		
		if(ch2==EOF)
			{
			printf("\n%s shorter than %s\n",argv[2],argv[1]);
			break;
			}

		if (ch1 != ch2)
			{
			fail=TRUE;
			
			if (first==FALSE)
				{
				first=TRUE;
				printf("\n");
				}
				
			printf("%04x = %02x - ( %02x )\n",addr,ch1,ch2);
			}
			
		else
			first=FALSE;
		}
		
		if (fail==FALSE)
			{
			printf("\n%s equals %s",argv[1],argv[2]);
			printf("   .....   [%04x-%04x]\n",start,addr);
			}

	fclose(in1);
	fclose(in2);
	}
		

#include ?cpm.lib
#include ?stdio.lib

.....   [%04x-%04x]\n",start,addr);
			}

	fclose(in1);