From: sunegn AT image DOT dk (Sune Nielsen)
Newsgroups: comp.os.msdos.djgpp
Subject: Newbie: HELP! It won't work!!!!
Message-ID: <37f92508.181091@news.image.dk>
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Date: Mon, 04 Oct 1999 22:22:05 GMT
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Please don't rip my head off for posting this rather longish email,
but I seriously need help :(

I've recently upgraded DJGPP from version 2.01 to 2.02, and now, for
some reason of which I have absolutely no idea, it compiles my code
into completely rubbish. Well... it actually compiles rather fine, but
when I try to run the program it tells me something like

<snip>----------------------
Call frame traceback:
in function malloc+99
in function _flsbuf+76
etc...
<snip>---------------------

I mean "malloc"... I don´t even use that function (it´s supposed to be
C++ ;)
Have I totally missed some point or... is my code really that buggy? I
am positive that it worked under v2.01!

Please help me & thanks in advance... 

Yours sincerly,
		Sune G. Nielsen

sunegn AT image DOT dk

<buggy code starts here...>
#include <iostream.h>

class object_3d{

private:

  struct vertex {double x,y,z,w;};
  struct facet { facet *nextfacet;
                 vertex vertex_array[2];
               };
  facet* first_facet;
  facet* last_facet;
  int numoffacets;

public:

  object_3d(void);
  ~object_3d(void);
  facet* new_facet(void);
  void add_facet(facet *f);
  void delete_facet(facet *f);
  void print_all(void);
};

object_3d::object_3d()
{
  first_facet=NULL;
  last_facet=NULL;
  numoffacets=NULL;
}

object_3d::~object_3d()
{
  facet* f=first_facet; //get_first_facet();
  facet* temp;

  while (f!=NULL)
    {
     temp=f->nextfacet;
     delete_facet(f);
     f=temp;
    }
}

object_3d::facet* object_3d::new_facet(void)
{
  facet* pointer= new facet;
  pointer->nextfacet=NULL;
  return (pointer);
}

void object_3d::add_facet(facet *f)
{
  facet* nf=first_facet;                      //lav pointer til nfacet
  facet* temp;

  if (nf==NULL) {first_facet=f;}
    else
      {
       while (nf->nextfacet!=NULL)     //s†l‘nge nf->next<> 0 g† ned i
r‘kken
         {
          nf=nf->nextfacet;
         }     //indtil = 0 (den sidste)
       nf->nextfacet=f;      //l‘g ny facet bagerst i r‘kken
       f->nextfacet=NULL;             //ikke flere facets
       last_facet=f;
      }
  numoffacets+=1;
}

void object_3d::delete_facet(facet *f)
{

  if (first_facet!=NULL)
    {
     facet* temp=first_facet;

     if (first_facet==f)
        {
         first_facet=first_facet->nextfacet;
         delete f;
        }
     else
        {
         while (temp->nextfacet!=f)
          {
           temp=temp->nextfacet;
          }
         temp->nextfacet=f->nextfacet;
        }

    delete f;
    numoffacets-=1;
    temp=first_facet;

    while (temp!=NULL)
     {
      last_facet=temp;
      temp=temp->nextfacet;
     }

   }
  else cout << "ERROR: No facets to delete" << endl << "Reason:
Selected facet has not been merged into object" << endl;
}

void object_3d::print_all(void)
{
  facet *fp;
  fp=first_facet;

  if (fp==NULL)
    {
     cout << "object contains NO facets!" << endl;
    }
  else
    {
     int num=1;

     while (fp!=NULL)
       {
        cout << "facet no. " << num << endl;

          for (int vert=0;vert<3;vert++)
            {
             cout << "vertex no. " << vert << " : (" <<
fp->vertex_array[vert].x << "," << fp->vertex_array[vert].y << "," <<
fp->vertex_array[vert].z << ")" << endl;
            }
        cout << endl;
        fp=fp->nextfacet;
        num+=1;
       }

     cout << "No. of facets: " << numoffacets << endl << endl;
     }
}

void main(void)
{
  object_3d cube;

  object_3d::facet *one;

  one=cube.new_facet();

  one->vertex_array[0].x=1.10;
  one->vertex_array[0].y=1.10;
  one->vertex_array[0].z=1.10;
  one->vertex_array[0].w=1.10;

  one->vertex_array[1].x=1.20;
  one->vertex_array[1].y=1.20;
  one->vertex_array[1].z=1.20;
  one->vertex_array[1].w=1.20;

  one->vertex_array[2].x=1.20;
  one->vertex_array[2].y=1.20;
  one->vertex_array[2].z=1.20;
  one->vertex_array[2].w=1.20;

  cube.add_facet(one);
  cube.print_all();
  cube.delete_facet(one);
  cube.print_all();
}