Let's try this. It's BUGGERED.

src/cmd/grap/coord.c

@@ -0,0 +1,71 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include "grap.h"
+#include "y.tab.h"
+
+char	*dflt_coord = "gg";
+char	*curr_coord = "gg";
+int	ncoord	= 0;	/* number of explicit coord's given */
+
+Point	xcoord;
+Point	ycoord;
+int	xcflag	= 0;	/* 1 if xcoord set */
+int	ycflag	= 0;
+int	logcoord = 0;
+
+void coord_x(Point pt)	/* remember x coord */
+{
+	xcoord = pt;
+	xcflag = 1;
+	margin = 0;	/* no extra space around picture if explicit coords */
+}
+
+void coord_y(Point pt)
+{
+	ycoord = pt;
+	ycflag = 1;
+	margin = 0;	/* no extra space if explicit coords */
+}
+
+void coordlog(int n)	/* remember log scaling */
+{
+	logcoord = n;
+}
+
+void coord(Obj *p)	/* set coord range */
+{
+	static char buf[10];
+
+	ncoord++;
+	if (ncoord > 1 && strcmp(p->name, dflt_coord) == 0) {
+		/* resetting default coordinate by implication */
+		sprintf(buf, "gg%d", ncoord);
+		dflt_coord = buf;
+		p = lookup(dflt_coord, 1);
+	}
+	if (xcflag) {
+		p->coord |= XFLAG;
+		p->pt.x = min(xcoord.x,xcoord.y);	/* "xcoord" is xmin, xmax */
+		p->pt1.x = max(xcoord.x,xcoord.y);
+		if ((logcoord&XFLAG) && p->pt.x <= 0.0)
+			ERROR "can't have log of x coord %g,%g", p->pt.x, p->pt1.x FATAL;
+		xcflag = 0;
+	}
+	if (ycflag) {
+		p->coord |= YFLAG;
+		p->pt.y = min(ycoord.x,ycoord.y);	/* "ycoord" is ymin, ymax */
+		p->pt1.y = max(ycoord.x,ycoord.y);
+		if ((logcoord&YFLAG) && p->pt.y <= 0.0)
+			ERROR "can't have log of y coord %g,%g", p->pt.y, p->pt1.y FATAL;
+		ycflag = 0;
+	}
+	p->log = logcoord;
+	logcoord = 0;
+	auto_x = 0;
+}
+
+void resetcoord(Obj *p)	/* reset current coordinate */
+{
+	curr_coord = p->name;
+}