gnu/dist/groff/src/preproc/grn/hpoint.cpp

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