Expand a 2D char array inside a Struct

**filzek** · 03-03-2020

Hi Guys,

I am trying to expand the 2d array elements but is not working as intent.

Code:

typedef struct exec_orders_t
{
    char                 id[37];
    char                 id2[37];
    char                 date[33];
    int                 queue_size;
    char **            queue[1][100];
} exec_orders_t;

so in the main part I do as follow

Code:

app_main(){
     struct exec_orders_t * exec_orders;


     exec_orders->queue= realloc(exec_orders->queue,sizeof(char *)*100*5);
}

but that is always error, I tried to change it to a pointer but give error as well.

Can you guys give an advice on what is the error on this?

**Salem** · 03-03-2020

> char ** queue[1][100];
I'm going to assume that what you want is something line char queue[N][100] for some variable N.

Because 2 stars and 2 brackets is a 4-D thing.

Begin with
char (*queue)[100];

Then you can do

Code:

void *temp = realloc(exec_orders->queue, sizeof(*exec_orders->queue)*(exec_orders->queue_size + 10) );
if ( temp ) {
    exec_orders->queue = temp;
    exec_orders->queue_size += 10;
}

When using realloc, always go via a temporary pointer initially.
If realloc does return NULL, it does NOT free the previous memory. You need your pointer to remain valid until you know realloc was successful.

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