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pirklg
Joined: 20 Jul 2006
Posts: 1
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| CCS PCH C Compiler 3.223 Problem with linkedlist |
 Posted: Thu Jul 20, 2006 1:41 am |
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Hi,
I am doing my diploma thesis at the moment. I am implementing a location system usin PIC Processors.
Received information has to be stored dynamically in a linked list (at the beginning - later a search tree should be therefore used).
Usually a linked list shouldn't be the problem, I already got the linked list running using the gcc compiler.
Here is the Code:
nlist.h:
| Code: | typedef struct listnode{
float x;
float y;
float z;
byte id[8];
unsigned int hop;
float distance;
} ElementType;
typedef struct Node *PtrToNode;
typedef PtrToNode List;
typedef PtrToNode Position;
List MakeEmpty( List L );
int IsEmpty( List L );
int IsLast( Position P, List L );
Position Find( ElementType X, List L );
void Delete( ElementType X, List L );
Position FindPrevious( ElementType X, List L );
void Insert( ElementType X, List L, Position P );
void DeleteList( List L );
Position Header( List L );
Position First( List L );
Position Advance( Position P );
ElementType Retrieve( Position P ); |
nList.c:
| Code: |
#include "nList.h"
#include <stdlibm.h>
#include <stddef.h>
struct Node
{
ElementType Element;
struct Node *Next;
};
List MakeEmpty( List L )
{
L = malloc( sizeof( struct Node ) );
//if( L == NULL )
//FatalError( "Out of memory!" );
L->Next = NULL; //<-------------- ERROR
return L;
} |
But with CCS C Compiler i got this strange error message:
Line 22 -> Expecting a structure / union.
The CCS Compiler defines NULL as 0 - this is the problem - how should I implement the linked list?
Any hints are wellcome.
Thanks for your Help,
Gerald |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Jul 20, 2006 4:04 pm |
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I worked on your problem a little bit yesterday, but don't have a
conclusion for you. I don't have PCH vs. 3.223. The closest I have
to that is vs. 3.230. I installed it, and was able to duplicate your
problem.
I then installed PCH vs. 3.249, and the compiler doesn't give any
error messages with that version.
I tried to find a work-around, so it would work with your earlier version.
I tried to cast the NULL to a 'List' data type, but that didn't work.
I tried using a variable of type 'List', instead of NULL, and that didn't
work either. At that point, I gave up. It could be that a work-around
is possible, but the other choice is to upgrade the compiler. |
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