randomly access memory within an allocated range

gistfile1.txt

Random integer in range algorithm:

given that rand() produces a random number between 0 and RAND_MAX (defined in stdlib.h)
and we want a random integer (rand_index) between 0 and page_range where page_range = malloc_size / page_size

page_range = malloc_size / page_size;

if ( RAND_MAX > page_range ) {
     rand_index = ( rand() % page_range ) * page_size;
} else {
     rand_index = ( rand() * ( page_range / RAND_MAX ) ) * page_size;
}