The variable p and the variable's name "p" need to be passed to the macro
function to test for nullness and then to print some message involving the
variable's name.
Is there a crafty way of doing this so that only one thing needs to be
passed?
Thanks!
#include <stdlib.h>
#include <stdio.h>
#define CHECK_FOR_NULLITITY(var,varname) \
if ( (var) == NULL ) \
{ \
printf("%s is null.\n", varname); \
exit(EXIT_FAILURE); \
}
int main( void )
{
char *p = NULL;
CHECK_FOR_NULLITITY( p, "p" );
return 0;
}
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