From 6c16f339224a4736f4ed57d15bb3e5f968a635ab Mon Sep 17 00:00:00 2001
From: 0scar <qgt268@alumni.ku.dk>
Date: Tue, 29 Sep 2020 08:51:02 +0200
Subject: Initial independent commit

---
 src/memory.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 src/memory.c

(limited to 'src/memory.c')

diff --git a/src/memory.c b/src/memory.c
new file mode 100644
index 0000000..6ef63ce
--- /dev/null
+++ b/src/memory.c
@@ -0,0 +1,62 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <engine/logging.h>
+
+#include <engine/memory.h>
+
+memory *memory_new(usize max_size) {
+  memory *m = malloc(sizeof(memory));
+  m->data   = malloc(max_size);
+  m->size   = max_size;
+  m->pos    = 0;
+  m->free   = max_size;
+
+  memset(m->data, 0, max_size);
+
+  return m;
+}
+
+/* Returns a pointer to the allocated data */
+void *memory_allocate(memory* mem, usize size) {
+  void* data = NULL;
+
+  if (mem->pos + size <= mem->size) {
+    data = (void*)((usize)mem->data + mem->pos);
+    mem->pos  += size;
+    mem->free -= size;
+  } else {
+    ERROR("Trying to allocate %lu in a %lu sized memory block", size, mem->size);
+    ERROR("No more room!");
+    exit(EXIT_FAILURE);
+  }
+
+  return data;
+}
+
+memory memory_init(void *data, usize size) {
+  memory m = {0};
+  m.data = data;
+  m.size = size;
+  m.free = 0;
+  return m;
+}
+
+void memory_free(memory *mem, usize size) {
+  if (size > mem->pos) {
+    perror("Freeing too much memory!");
+    exit(EXIT_FAILURE);
+  } else {
+    mem->pos  -= size;
+    mem->free += size;
+  }
+}
+
+void memory_clear(memory *mem) {
+	mem->pos  = 0;
+	mem->free = mem->size;
+	/* Reset the memory? */
+	memset(mem->data, 0, mem->size);
+}
-- 
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