573   char *p0, *p1, *buffer0, *buffer1;  in find_identical_ends()  local
601   p0 = buffer0 = (char *) w0;  in find_identical_ends()
606   if (p0 == p1)  in find_identical_ends()
608     p0 = p1 += n1;  in find_identical_ends()
615 	p0[n0] = ~p1[n0];  in find_identical_ends()
617 	p1[n1] = ~p0[n1];  in find_identical_ends()
626       p0 = (char *) w0;  in find_identical_ends()
628       while (*p0 == *p1)  in find_identical_ends()
629 	p0++, p1++;  in find_identical_ends()
633 	  && ((buffer0 + n0 - filevec[0].missing_newline < p0)  in find_identical_ends()
636 	p0--, p1--;  in find_identical_ends()
639   /* Now P0 and P1 point at the first nonmatching characters.  */  in find_identical_ends()
644   while (p0 != buffer0 && (p0[-1] != '\n' || i--))  in find_identical_ends()
645     p0--, p1--;  in find_identical_ends()
648   filevec[0].prefix_end = p0;  in find_identical_ends()
653   /* P0 and P1 point beyond the last chars not yet compared.  */  in find_identical_ends()
654   p0 = buffer0 + n0;  in find_identical_ends()
660       end0 = p0;	/* Addr of last char in file 0.  */  in find_identical_ends()
662       /* Get value of P0 at which we should stop scanning backward:  in find_identical_ends()
663 	 this is when either P0 or P1 points just past the last char  in find_identical_ends()
668       for (; p0 != beg0; p0--, p1--)  in find_identical_ends()
669 	if (*p0 != *p1)  in find_identical_ends()
672 	    beg0 = p0;  in find_identical_ends()
680       i = horizon_lines + !((buffer0 == p0 || p0[-1] == '\n')  in find_identical_ends()
683       while (i-- && p0 != end0)  in find_identical_ends()
684 	while (*p0++ != '\n')  in find_identical_ends()
687       p1 += p0 - beg0;  in find_identical_ends()
691   filevec[0].suffix_begin = p0;  in find_identical_ends()
711       middle_guess = guess_lines (0, 0, p0 - filevec[0].prefix_end);  in find_identical_ends()
712       suffix_guess = guess_lines (0, 0, buffer0 + n0 - p0);  in find_identical_ends()
727   p0 = buffer0;  in find_identical_ends()
731 	 && filevec[0].prefix_end == p0  in find_identical_ends()
735       while (p0 != end0)  in find_identical_ends()
745 	  linbuf0[l] = p0;  in find_identical_ends()
746 	  while (*p0++ != '\n')  in find_identical_ends()
754   middle_guess = guess_lines (lines, p0 - buffer0, p1 - filevec[1].prefix_end);  in find_identical_ends()
755   suffix_guess = guess_lines (lines, p0 - buffer0, buffer1 + n1 - p1);  in find_identical_ends()