#define NO_NULL_REALLOC 1
#if NO_NULL_REALLOC
# define rrd_realloc(a,b) ( (a) == NULL ? malloc( (b) ) : realloc( (a) , (b) ))
#else
# define rrd_realloc(a,b) realloc((a), (b))
#define NO_NULL_REALLOC 1
#if NO_NULL_REALLOC
# define rrd_realloc(a,b) ( (a) == NULL ? malloc( (b) ) : realloc( (a) , (b) ))
#else
# define rrd_realloc(a,b) realloc((a), (b))