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Implement bitmap_ffu(), which finds the first unset bit.

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This commit is contained in:
Jason Evans
2017-03-23 17:59:47 -07:00
parent a832ebaee9
commit c8021d01f6
6 changed files with 136 additions and 25 deletions
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59
test/unit/bitmap.c
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@@ -171,12 +171,18 @@ test_bitmap_init_body(const bitmap_info_t *binfo, size_t nbits) {
size_t i;
bitmap_t *bitmap = (bitmap_t *)malloc(bitmap_size(binfo));
assert_ptr_not_null(bitmap, "Unexpected malloc() failure");
bitmap_init(bitmap, binfo);
bitmap_init(bitmap, binfo, false);
for (i = 0; i < nbits; i++) {
assert_false(bitmap_get(bitmap, binfo, i),
"Bit should be unset");
}
bitmap_init(bitmap, binfo, true);
for (i = 0; i < nbits; i++) {
assert_true(bitmap_get(bitmap, binfo, i), "Bit should be set");
}
free(bitmap);
}
@@ -202,7 +208,7 @@ test_bitmap_set_body(const bitmap_info_t *binfo, size_t nbits) {
size_t i;
bitmap_t *bitmap = (bitmap_t *)malloc(bitmap_size(binfo));
assert_ptr_not_null(bitmap, "Unexpected malloc() failure");
bitmap_init(bitmap, binfo);
bitmap_init(bitmap, binfo, false);
for (i = 0; i < nbits; i++) {
bitmap_set(bitmap, binfo, i);
@@ -233,7 +239,7 @@ test_bitmap_unset_body(const bitmap_info_t *binfo, size_t nbits) {
size_t i;
bitmap_t *bitmap = (bitmap_t *)malloc(bitmap_size(binfo));
assert_ptr_not_null(bitmap, "Unexpected malloc() failure");
bitmap_init(bitmap, binfo);
bitmap_init(bitmap, binfo, false);
for (i = 0; i < nbits; i++) {
bitmap_set(bitmap, binfo, i);
@@ -268,14 +274,22 @@ TEST_END
static void
test_bitmap_sfu_body(const bitmap_info_t *binfo, size_t nbits) {
size_t i;
bitmap_t *bitmap = (bitmap_t *)malloc(bitmap_size(binfo));
assert_ptr_not_null(bitmap, "Unexpected malloc() failure");
bitmap_init(bitmap, binfo);
bitmap_init(bitmap, binfo, false);
/* Iteratively set bits starting at the beginning. */
for (i = 0; i < nbits; i++) {
assert_zd_eq(bitmap_sfu(bitmap, binfo), i,
for (size_t i = 0; i < nbits; i++) {
assert_zu_eq(bitmap_ffu(bitmap, binfo, 0), i,
"First unset bit should be just after previous first unset "
"bit");
assert_zu_eq(bitmap_ffu(bitmap, binfo, (i > 0) ? i-1 : i), i,
"First unset bit should be just after previous first unset "
"bit");
assert_zu_eq(bitmap_ffu(bitmap, binfo, i), i,
"First unset bit should be just after previous first unset "
"bit");
assert_zu_eq(bitmap_sfu(bitmap, binfo), i,
"First unset bit should be just after previous first unset "
"bit");
}
@@ -285,9 +299,15 @@ test_bitmap_sfu_body(const bitmap_info_t *binfo, size_t nbits) {
* Iteratively unset bits starting at the end, and verify that
* bitmap_sfu() reaches the unset bits.
*/
for (i = nbits - 1; i < nbits; i--) { /* (nbits..0] */
for (size_t i = nbits - 1; i < nbits; i--) { /* (nbits..0] */
bitmap_unset(bitmap, binfo, i);
assert_zd_eq(bitmap_sfu(bitmap, binfo), i,
assert_zu_eq(bitmap_ffu(bitmap, binfo, 0), i,
"First unset bit should the bit previously unset");
assert_zu_eq(bitmap_ffu(bitmap, binfo, (i > 0) ? i-1 : i), i,
"First unset bit should the bit previously unset");
assert_zu_eq(bitmap_ffu(bitmap, binfo, i), i,
"First unset bit should the bit previously unset");
assert_zu_eq(bitmap_sfu(bitmap, binfo), i,
"First unset bit should the bit previously unset");
bitmap_unset(bitmap, binfo, i);
}
@@ -297,14 +317,29 @@ test_bitmap_sfu_body(const bitmap_info_t *binfo, size_t nbits) {
* Iteratively set bits starting at the beginning, and verify that
* bitmap_sfu() looks past them.
*/
for (i = 1; i < nbits; i++) {
for (size_t i = 1; i < nbits; i++) {
bitmap_set(bitmap, binfo, i - 1);
assert_zd_eq(bitmap_sfu(bitmap, binfo), i,
assert_zu_eq(bitmap_ffu(bitmap, binfo, 0), i,
"First unset bit should be just after the bit previously "
"set");
assert_zu_eq(bitmap_ffu(bitmap, binfo, (i > 0) ? i-1 : i), i,
"First unset bit should be just after the bit previously "
"set");
assert_zu_eq(bitmap_ffu(bitmap, binfo, i), i,
"First unset bit should be just after the bit previously "
"set");
assert_zu_eq(bitmap_sfu(bitmap, binfo), i,
"First unset bit should be just after the bit previously "
"set");
bitmap_unset(bitmap, binfo, i);
}
assert_zd_eq(bitmap_sfu(bitmap, binfo), nbits - 1,
assert_zu_eq(bitmap_ffu(bitmap, binfo, 0), nbits - 1,
"First unset bit should be the last bit");
assert_zu_eq(bitmap_ffu(bitmap, binfo, (nbits > 1) ? nbits-2 : nbits-1),
nbits - 1, "First unset bit should be the last bit");
assert_zu_eq(bitmap_ffu(bitmap, binfo, nbits - 1), nbits - 1,
"First unset bit should be the last bit");
assert_zu_eq(bitmap_sfu(bitmap, binfo), nbits - 1,
"First unset bit should be the last bit");
assert_true(bitmap_full(bitmap, binfo), "All bits should be set");
free(bitmap);