From 11dc4b81935e3dfee997c421d8d6fa166edd7a05 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sun, 24 Feb 2019 02:10:58 +0100
Subject: Initial commit, Function declaration work somewhat

---
 src/buffer.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 src/buffer.c

(limited to 'src/buffer.c')

diff --git a/src/buffer.c b/src/buffer.c
new file mode 100644
index 0000000..4bd3b68
--- /dev/null
+++ b/src/buffer.c
@@ -0,0 +1,56 @@
+#include "../include/buffer.h"
+#include "../include/alloc.h"
+#include "../include/mem.h"
+#include <assert.h>
+
+void buffer_init(Buffer *self) {
+    self->data = NULL;
+    self->size = 0;
+    self->capacity = 0;
+}
+
+void buffer_deinit(Buffer *self) {
+    am_free(self->data);
+    self->data = NULL;
+    self->size = 0;
+    self->capacity = 0;
+}
+
+static WARN_UNUSED_RESULT int buffer_ensure_capacity(Buffer *self, usize new_capacity) {
+    usize capacity;
+    void *new_mem;
+    int alloc_result;
+
+    if(self->capacity >= new_capacity)
+        return BUFFER_OK;
+    
+    capacity = self->capacity;
+    if(capacity == 0) {
+        capacity = new_capacity;
+    } else {
+        while(capacity < new_capacity) {
+            capacity *= 1.5;
+        }
+    }
+
+    alloc_result = am_realloc(self->data, capacity, &new_mem);
+    if(alloc_result != ALLOC_OK)
+        return BUFFER_ALLOC_FAIL;
+    
+    self->data = new_mem;
+    self->capacity = capacity;
+    return BUFFER_OK;
+}
+
+int buffer_append(Buffer *self, void *data, usize size) {
+    return_if_error(buffer_ensure_capacity(self, self->size + size));
+    am_memcpy(self->data + self->size, data, size);
+    return BUFFER_OK; 
+}
+
+void* buffer_get(Buffer *self, usize index, usize type_size) {
+    usize real_index;
+    real_index = index * type_size;
+    assert(real_index < self->size);
+    return &self->data[real_index];
+}
\ No newline at end of file
-- 
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