Begin work on custom allocators in dynarr.h

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/dynarr/dapush.c b/lib/dynarr/dapush.c
new file mode 100644
index 0000000..11fde1b
--- /dev/null
+++ b/lib/dynarr/dapush.c
@@ -0,0 +1,22 @@
+#include <errno.h>
+#include <stdbit.h>
+#include <stdint.h>
+#include <string.h>
+
+#include "dynarr.h"
+
+void *
+(dapush)(void *da, void *x, size_t sz, size_t align)
+{
+	dynarr(uint8_t) cpy;
+	memcpy(&cpy, da, sizeof(cpy));
+
+	if (++cpy.len > cpy.cap) {
+		size_t ncap = stdc_bit_ceil(cpy.len);
+		cpy.buf = cpy.alloc(cpy.ctx, cpy.buf, cpy.cap, ncap, sz, align);
+		cpy.cap = ncap;
+	}
+
+	memcpy(cpy.buf + cpy.len * sz - sz, x, sz);
+	return memcpy(da, &cpy, sizeof(cpy));
+}