[SOLVED] CS /* Test program for sorting and searching in lib/stdlib.c.

/* Test program for sorting and searching in lib/stdlib.c.

Attempts to test the sorting and searching functionality that
is not sufficiently tested elsewhere in Pintos.

This is not a test we will run on your submitted projects.
It is here for completeness.
*/

#undef NDEBUG
#include
#include #include
#include
#include
#include threads/test.h

/* Maximum number of elements in an array that we will test. */
#define MAX_CNT 4096

static void shuffle (int[], size_t);
static int compare_ints (const void *, const void *);
static void verify_order (const int[], size_t);
static void verify_bsearch (const int[], size_t);

/* Test sorting and searching implementations. */
void
test (void)
{
int cnt;

printf (testing various size arrays:);
for (cnt = 0; cnt < MAX_CNT; cnt = cnt * 4 / 3 + 1){int repeat;printf (” %zu”, cnt);for (repeat = 0; repeat < 10; repeat++) {static int values[MAX_CNT];int i;/* Put values 0…CNT in random order in VALUES. */for (i = 0; i < cnt; i++)values[i] = i;shuffle (values, cnt);/* Sort VALUES, then verify ordering. */qsort (values, cnt, sizeof *values, compare_ints);verify_order (values, cnt);verify_bsearch (values, cnt);}}printf (” done
“);printf (“stdlib: PASS
“);}/* Shuffles the CNT elements in ARRAY into random order. */static voidshuffle (int *array, size_t cnt) {size_t i;for (i = 0; i < cnt; i++){size_t j = i + random_ulong () % (cnt – i);int t = array[j];array[j] = array[i];array[i] = t;}}/* Returns 1 if *A is greater than *B, 0 if *A equals *B, -1 if *A is less than *B. */static intcompare_ints (const void *a_, const void *b_) {const int *a = a_;const int *b = b_;return *a < *b ? -1 : *a > *b;
}

/* Verifies that ARRAY contains the CNT ints 0CNT-1. */
static void
verify_order (const int *array, size_t cnt)
{
int i;

for (i = 0; (size_t) i < cnt; i++) ASSERT (array[i] == i);}/* Checks that bsearch() works properly in ARRAY.ARRAY must contain the values 0…CNT-1. */static voidverify_bsearch (const int *array, size_t cnt) {int not_in_array[] = {0, -1, INT_MAX, MAX_CNT, MAX_CNT + 1, MAX_CNT * 2};int i;/* Check that all the values in the array are found properly. */for (i = 0; (size_t) i < cnt; i++) ASSERT (bsearch (&i, array, cnt, sizeof *array, compare_ints)== array + i);/* Check that some values not in the array are not found. */not_in_array[0] = cnt;for (i = 0; (size_t) i < sizeof not_in_array / sizeof *not_in_array; i++) ASSERT (bsearch (&not_in_array[i], array, cnt, sizeof *array, compare_ints)== NULL);}