Incremental Diff

// This is pretty old now, have newer versions somewhere without the fake basic like syntax

#include "defines.h"

struct files
{
    FILE *input;
};

MAIN;
    //ARG_CHECK(2);

    UCHAR inbyte[argc];
    ULONG pos=0;
    struct files pointer[argc];
    UINT d=0;
    UINT change=0;
    ULONG fs=0;
    UINT e=0;

    for (d=0; d < argc; d++ )
    {
        inbyte[d]='\0';
    }


    for(d=0; d < argc-1; d++)
    {
        if ( ( pointer[d].input = fopen(argv[d+1],"r") ) == NULL )
        {

            printf("File %s open failed\n",argv[d+1]);
            exit(-1);
        }else{
            printf("File %s opened for r\n",argv[d+1]);
        }
    }

    fseek(pointer[0].input,0L,SEEK_END);
    fs=ftell(pointer[0].input);
    fseek(pointer[0].input,0L,SEEK_SET);

    while ( pos < fs )
    {
        for(d=0; d < argc-1; d++ )
        {
            fread(&inbyte[d],1,1,pointer[d].input);
            //printf("Read %d from file %s\n",inbyte[d],argv[d+1]);
        }

        for(d=0; d < argc-1; d++ )
        {
            for(e=0; e < argc-1; e++)
            {
                if ( inbyte[d] != inbyte[e] )
                {
                    change++;
                }
            }
        }

        if ( change >= (argc-1)*2 )// *(argc-1) )
        {
            printf("%d: ", pos );
            for(d=0; d < argc-1; d++ )
            {
                if ( d == argc-2 )
                {
                    printf("%d",inbyte[d]);
                }else{
                    printf("%d -> ",inbyte[d]);
                }
            }
            printf("\n");
        }

        for (d=0; d < argc-1; d++ )
        {
            inbyte[d]='\0';
        }

        pos++;

        change=0;
    END;

    for(d=0; d < argc-1; d++)
    {
        CLOSE(pointer[d].input);
    }

    RET;
END;