Thread: Initialising

Hi, I am new to this board and rubbish at C so please be kind!
Im trying to initialise a hash table but am having trouble allocating memory for it. Can you please have a look and see where I've slipped up?

Code:

void Initialize(Table T)
{

     int i,j;

	 T = calloc(TableSize,sizeof(TableEntry));

   for (i=0;i<TableSize;i++)
   {
	   T[i].Info.Actor = calloc(1, sizeof(TableSize));
		T[i].Info.Films = calloc(1, sizeof(TableSize));
      strcpy(T[i].Key,"XXX");
      T[i].Info.NumberFilms=0;
      strcpy(T[i].Info.Actor,"nnn");
      for (j=0;j<50;j++)
	  {
		 T[i].Info.Films[j] = calloc(1, sizeof(TableSize));
         strcpy(T[i].Info.Films[j],"hhh");
	  }
   }
}

THe info structure is defined as

Code:

typedef struct
{
	int  NumberFilms;
	char* Actor;
	char** Films;
} InfoType;

And the table entry

Code:

typedef struct
{
   KeyType  Key;
   InfoType Info;
} TableEntry;

typedef TableEntry Table[TableSize];

Thanks in advance
eeeeej

thanks for the reply. Tried that and yeh it did make more sense when I read it! I think I had been experimenting and forgot to go back. The debugger holds up on

Code:

		 T[i].Info.Films[j] = calloc(1, 200);

ANything obvious. Im trying to clear this for the double pointer used in the structure.

eeeeej

for (j=0;j<50;j++)
{
T[i].Info.Films[j] = calloc(50, 200);
strcpy(T[i].Info.Films[j],"hhh");
}

Thanks for your replies so far you're being very helpful. I've stared at this for so long now it just isn't going in.

Code:

void Initialize(Table T)
{

// Declare variables
     int i,j;

// Allocate structure memory
	 T = calloc(TableSize,sizeof(TableEntry));

//Allocate memory for all pointers in the structure
   for (i=0;i<TableSize;i++)
   {
	   T[i].Info.Actor = calloc(1, 200);
	   T[i].Info.Films = calloc(50, sizeof(char *));
      strcpy(T[i].Key,"XXX");
      T[i].Info.NumberFilms=0;
      strcpy(T[i].Info.Actor,"nnn");
      for (j=0;j<50;j++)
	  {
		 T[i].Info.Films[j] = calloc(1, 200);
         strcpy(T[i].Info.Films[j],"hhh");
	  }
   }
}

thats what I have so far but its still erroring out?

Code:

typedef char KeyType[200];

typedef struct
{
	int  NumberFilms;
	char* Actor;
	char** Films;
} InfoType;

typedef struct
{
   KeyType  Key;
   InfoType Info;
} TableEntry;

typedef TableEntry Table[TableSize];

up there!

well when I call it I just do

Code:

	Initialize(T);

as its a function....?

I decalre Table T;

then call the function
Initialize(T);

and have the allocated memory in the header file
typedef TableEntry Table[TableSize];

Yeah I tried removing that. still erroring out. I'll try and give you some more code to see if it sheds any light as its saying stack overflow.

Code:

	for (j=0;j<num_entries;j++)
	{

		if (j%1 == 0)
		{
				
			for (i=0;i<IMDBSIZE;i++)
			{
				I.Actor = (char *) calloc(strlen(IMDB[i].actor),sizeof(char));

				strcpy(I.Actor, IMDB[i].actor);
				strcpy(K, IMDB[i].actor);

				I.NumberFilms=IMDB[i].num_films;

				I.Films = (char **) calloc(strlen(IMDB[i].films[j]),sizeof(char*));
				for (j=0;j<IMDB[i].num_films;j++)
				{
					I.Films[j] = (char *) calloc(strlen(IMDB[i].films[j]),sizeof(char));
					strcpy(I.Films[j], IMDB[i].films[j]);
				}

				HInsert(K,I,T);
					getch();
			}
					
		}
	}

thats for passing into the table