Add a generator for slightly noisy reverse order data

1 files changed, 20 insertions, 9 deletions

diff --git a/generators.c b/generators.c
index 2e31b72..4c73454 100644
--- a/generators.c
+++ b/generators.c
@@ -38,26 +38,37 @@ static void generate_constant(int *buffer, size_t size)
 	for (size_t i = 0; i < size; i++) buffer[i] = 42;
 }
 
-static void generate_sorted_noise(int *buffer, size_t size)
+static void add_noise(int *buffer, size_t size)
 {
 	int noisemax = size / 4;
 	int noiseoff = size / 8;
 
 	srandom(1);
 	for (size_t i = 0; i < size; i++) {
-		int noise = 0;
 		if (random() < 0.2 * RAND_MAX) {
-			noise = random() % noisemax - noiseoff;
+			buffer[i] += random() % noisemax - noiseoff;
 		}
-		buffer[i] = i + noise;
 	}
 }
 
+static void generate_sorted_noise(int *buffer, size_t size)
+{
+	generate_sorted(buffer, size);
+	add_noise(buffer, size);
+}
+
+static void generate_reverse_noise(int *buffer, size_t size)
+{
+	generate_reverse(buffer, size);
+	add_noise(buffer, size);
+}
+
 const struct generator generators[] = {
-	{ .name = "random",       .func = generate_random       },
-	{ .name = "sorted",       .func = generate_sorted       },
-	{ .name = "reverse",      .func = generate_reverse      },
-	{ .name = "constant",     .func = generate_constant     },
-	{ .name = "sorted+noise", .func = generate_sorted_noise },
+	{ .name = "random",        .func = generate_random        },
+	{ .name = "sorted",        .func = generate_sorted        },
+	{ .name = "reverse",       .func = generate_reverse       },
+	{ .name = "constant",      .func = generate_constant      },
+	{ .name = "sorted+noise",  .func = generate_sorted_noise  },
+	{ .name = "reverse+noise", .func = generate_reverse_noise },
 	{ 0 }
 };