over.c

unix v7是最后一个广泛发布的研究型UNIX版本

# include "e.h"

boverb(p1, p2) int p1, p2; {
	int h, b, treg, d;

	treg = oalloc();
	yyval = p1;
	d = VERT(1);
	h = eht[p1] + eht[p2];
	b = eht[p2] - d;
	if(dbg)printf(".\tb:bob: S%d <- S%d over S%d; b=%d, h=%d\n", 
		yyval, p1, p2, b, h);
	nrwid(p1, ps, p1);
	nrwid(p2, ps, p2);
	printf(".nr %d \\n(%d\n", treg, p1);
	printf(".if \\n(%d>\\n(%d .nr %d \\n(%d\n", p2, treg, treg, p2);
	printf(".ds %d \\v'%du'\\h'\\n(%du-\\n(%du/2u'\\*(%d\\\n", 
		yyval, eht[p2]-ebase[p2]-d, treg, p2, p2);
	printf("\\h'-\\n(%du-\\n(%du/2u'\\v'%du'\\*(%d\\\n", 
		p2, p1, -eht[p2]+ebase[p2]-ebase[p1], p1);
	printf("\\h'-\\n(%du-\\n(%du-2u/2u'\\v'%du'\\l'\\n(%du'\\v'%du'\n", 
		 treg, p1, ebase[p1], treg, d);
	ebase[yyval] = b;
	eht[yyval] = h;
	lfont[yyval] = rfont[yyval] = 0;
	ofree(p2);
	ofree(treg);
}