Thread: malloc () test

If malloc fails then it will return a NULL pointer, otherwise you got your memory:

Code:

var = malloc ( 26 * sizeof ( char ) );
if ( var != NULL ) {
  /* It's good, work with it. */
}
else {
  /* Bad, handle the error */
}

And please don't cast malloc, it's not needed and can hide other problems.

-Prelude

You make sure that it's return value is not NULL. If it is, it failed.

Code:

if ((ptr = malloc(26)) == NULL)
{
	printf("memory problem!");
	return 1;
}

>But is there a way to print how much memory was assigned?
You can't be sure exactly how much malloc gave you since it can and often does give you slightly more than you ask for and sizeof won't work with dynamic memory. So maintain a size variable which holds the size you gave malloc and use that.

-Prelude