1 /* Last non-groff version: hpoint.c  1.1  84/10/08 */
2 
3 /*
4  * This file contains routines for manipulating the point data structures
5  * for the gremlin picture editor.
6  */
7 
8 #include <stdlib.h>
9 #include "gprint.h"
10 
11 
12 /*
13  * Return pointer to empty point list.
14  */
15 POINT *
PTInit()16 PTInit()
17 {
18   return ((POINT *) NULL);
19 }
20 
21 
22 /*
23  * This routine creates a new point with coordinates x and y and links it
24  * into the pointlist.
25  */
26 POINT *
PTMakePoint(double x,double y,POINT ** pplist)27 PTMakePoint(double x,
28 	    double y,
29 	    POINT **pplist)
30 {
31   register POINT *pt;
32 
33   if (Nullpoint(pt = *pplist)) {	/* empty list */
34     *pplist = (POINT *) malloc(sizeof(POINT));
35     pt = *pplist;
36   } else {
37     while (!Nullpoint(pt->nextpt))
38       pt = pt->nextpt;
39     pt->nextpt = (POINT *) malloc(sizeof(POINT));
40     pt = pt->nextpt;
41   }
42 
43   pt->x = x;
44   pt->y = y;
45   pt->nextpt = PTInit();
46   return (pt);
47 }				/* end PTMakePoint */
48 
49 /* EOF */
50