Pointers and structures

[cosmo1996]

I have a problem when I try to allocate some memory for my structrure.

#define BUFSIZE		100


typedef struct hash_t{
		char 			*buffer[50];
		unsigned int		*t_index;
		}HASH_T;
HASH_T	*phtable[BUFSIZE];

if ((phtable = ((struct hash_t *) malloc(sizeof (struct hash_t)*100))) == NULL)
			printf("Allocation error");

At compilation I get:"Operands of = have incompatible types 'struct hash_t * [100]' and 'struct hash_t *'." " Lvalue required".

Thank you

[MacGyver]

You're taking an array and trying to assign it something. If you want to dynamically allocate a block of memory and treat it like an array, then you use a pointer.

[chetan upadhyay]

Hi,

You have declared a two dimensional array of structures:

HASH_T *phtable[BUFSIZE];

i,e; pointer phtable points to the first element of BUFSIZE no. of structures of type hash_t...

so you ned to allocate memory for each element..

since phtable is a pointer to the two dimensional array...it needs the array index([]),
thats why the compiler is throwing the error : " Lvalue required".

try this out

        for( count = 0 ; count < BUFSIZE ; ++count) {
            if ((phtable[count] = ((struct hash_t *) malloc(sizeof (struct hash_t)*1))) == NULL)
			printf("Allocation error");
        }

This might resolve the problem...

[vart]

you do not need to cast malloc in C - see FAQ