Re: [Dev-C++] Allocation and deallocation

[Per W. <pw...@ia...>]

Do not try sizeof(strlen(str));

That is a fixed value - the size of the data type returned by strlen
(normally size_t, if runtime library is compliant with the C standard).

You want to allocate (strlen(str)+1) bytes, i.e. one byte for each
character in the string, and an extra byte for the termination.

An easier way to allocate and assign at the same time is to do
name = strdup(str);


Also, you have mixed up data types.

If the list entries are struct list, then that is the data type that the
queue entry should have for it's 'front' pointer.

/pwm

On Thu, 10 May 2007, Jan Mura wrote:

> Hello,
>
> I have got two more things about the allocation of pointer types.
>
> I have structure like:
>
> struct list
> {
>   int id;
> char *name;
>   struct list *next;
> };
>
> struct list *element;
>
> Should now   I do something like:
>
> element = malloc(sizeof(struct(list element));
> element->name = malloc(sizeof(strlen("some string here")));
> element->next = malloc(sizeof(struct list((;
>
> ...main program here...
>
> free(element->next);
> free(element->name);
>
> ?
>
> And the second thing, more about the alghoritgm of connected list or how is
> it     called.
> The structure above defines an element of such a list. Where there is NULL
> in element->next it means it is the last element in the list. And I have
> another structure defined like:
>
> typedef struct Queue{
>  struct bet_list *front;
> }Queue;
> Queue *q;
>
> I store an adress to the first element in the list in q.
> Is this correct? Or is there some more commone and easier way?
>
> Thank you again
>
> Jan Mura
> jan...@vo...
>
>
>
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