lib/vec: Add igt_vec

Add a small std::vector lookalike which grows as needed.

v2: Reorganize things into igt_vec_grow() (Chris)
    Trust that memmove(..., 0) works (Chris)

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/lib/igt_vec.h b/lib/igt_vec.h
new file mode 100644
index 000000000..de2549a45
--- /dev/null
+++ b/lib/igt_vec.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright © 2020 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef __IGT_VEC_H__
+#define __IGT_VEC_H__
+
+struct igt_vec {
+	void *elems;
+	int elem_size, size, len;
+};
+
+void igt_vec_init(struct igt_vec *vec, int elem_size);
+void igt_vec_fini(struct igt_vec *vec);
+void igt_vec_push(struct igt_vec *vec, void *elem);
+int igt_vec_length(const struct igt_vec *vec);
+void *igt_vec_elem(const struct igt_vec *vec, int idx);
+int igt_vec_index(const struct igt_vec *vec, void *elem);
+void igt_vec_remove(struct igt_vec *vec, int idx);
+
+#endif /* __IGT_VEC_H__ */