gistfile1.c

void encode(void)
{
    int i, j, f1, x, y, r, s, bufferend, c;
    
    for (i = 0; i < N - F; i++) buffer[i] = ' ';
    for (i = N - F; i < N * 2; i++) {
        if ((c = fgetc(infile)) == EOF) break;
        buffer[i] = c;  textcount++;
    }
    bufferend = i; r = N - F; s = 0;
    ...
}