bitmap: Implement bitmap_ffs()

[ccan] / ccan / bitmap / test / run-ffs.c

diff --git a/ccan/bitmap/test/run-ffs.c b/ccan/bitmap/test/run-ffs.c
new file mode 100644 (file)
index 0000000..0f6cc4c
--- /dev/null
+++ b/ccan/bitmap/test/run-ffs.c
@@ -0,0 +1,74 @@
+#include <ccan/bitmap/bitmap.h>
+#include <ccan/tap/tap.h>
+#include <ccan/array_size/array_size.h>
+#include <ccan/foreach/foreach.h>
+
+#include <ccan/bitmap/bitmap.c>
+
+int bitmap_sizes[] = {
+       1, 2, 3, 4, 5, 6, 7, 8,
+       16, 17, 24, 32, 33,
+       64, 65, 127, 128, 129,
+       1023, 1024, 1025,
+};
+#define NSIZES ARRAY_SIZE(bitmap_sizes)
+
+#define ok_eq(a, b) \
+       ok((a) == (b), "%s [%u] == %s [%u]", \
+          #a, (unsigned)(a), #b, (unsigned)(b))
+
+static void test_size(int nbits)
+{
+       BITMAP_DECLARE(bitmap, nbits);
+       int i;
+
+       bitmap_zero(bitmap, nbits);
+       ok_eq(bitmap_ffs(bitmap, 0, nbits), nbits);
+
+       for (i = 0; i < nbits; i++) {
+               bitmap_zero(bitmap, nbits);
+               bitmap_set_bit(bitmap, i);
+
+               ok_eq(bitmap_ffs(bitmap, 0, nbits), i);
+               ok_eq(bitmap_ffs(bitmap, i, nbits), i);
+               ok_eq(bitmap_ffs(bitmap, i + 1, nbits), nbits);
+
+               bitmap_zero(bitmap, nbits);
+               bitmap_fill_range(bitmap, i, nbits);
+
+               ok_eq(bitmap_ffs(bitmap, 0, nbits), i);
+               ok_eq(bitmap_ffs(bitmap, i, nbits), i);
+               ok_eq(bitmap_ffs(bitmap, i + 1, nbits), (i + 1));
+               ok_eq(bitmap_ffs(bitmap, nbits - 1, nbits), (nbits - 1));
+
+               if (i > 0) {
+                       ok_eq(bitmap_ffs(bitmap, 0, i), i);
+                       ok_eq(bitmap_ffs(bitmap, 0, i - 1), (i - 1));
+               }
+
+               if (i > 0) {
+                       bitmap_zero(bitmap, nbits);
+                       bitmap_fill_range(bitmap, 0, i);
+
+                       ok_eq(bitmap_ffs(bitmap, 0, nbits), 0);
+                       ok_eq(bitmap_ffs(bitmap, i - 1, nbits), (i - 1));
+                       ok_eq(bitmap_ffs(bitmap, i, nbits), nbits);
+               }
+       }
+}
+
+int main(void)
+{
+       int i;
+
+       /* Too complicated to work out the exact number */
+       plan_no_plan();
+
+       for (i = 0; i < NSIZES; i++) {
+               diag("Testing %d-bit bitmap", bitmap_sizes[i]);
+               test_size(bitmap_sizes[i]);
+       }
+
+       /* This exits depending on whether all tests passed */
+       return exit_status();
+}