feature: a lot of stuff and got to a working command line ish

kernel/libc/ringqueue.c

@@ -0,0 +1,57 @@
+//
+// Created by rick on 30-01-21.
+//
+
+#include "ringqueue.h"
+#include <libc/libc.h>
+#include <mem/mem.h>
+
+#define calc_pos(buffer, index) ((buffer->object_size) * (index))
+
+typedef struct {
+    int object_size;
+    int count;
+    int read_pos;
+    int write_pos;
+    void *mem;
+} ring_buffer_t;
+
+void *create_buffer(int count, int object_size) {
+    ring_buffer_t *buffer = malloc(sizeof(ring_buffer_t));
+    if (buffer == NULL) {
+        return NULL;
+    }
+    buffer->object_size = object_size;
+    buffer->count = count;
+    buffer->read_pos = 0;
+    buffer->write_pos = 0;
+    buffer->mem = malloc(count * object_size);
+    if (buffer->mem == NULL) {
+        free(buffer);
+        return NULL;
+    }
+    return buffer;
+};
+
+void free_buffer(void *buffer) {
+    free(((ring_buffer_t *) buffer)->mem);
+    free(buffer);
+}
+
+void ring_buffer_put(void *buffer, void *item) {
+    ring_buffer_t *ring_buffer = (ring_buffer_t *) buffer;
+    // todo check if this write would overwrite the current reading pos
+    // todo handle the above case
+    memcpy(ring_buffer->mem + calc_pos(ring_buffer, ring_buffer->write_pos), item, ring_buffer->object_size);
+    ring_buffer->write_pos++;
+};
+
+bool ring_buffer_get(void *buffer, void* target) {
+    ring_buffer_t *ring_buffer = (ring_buffer_t *) buffer;
+    if (ring_buffer->read_pos == ring_buffer->write_pos) {
+        // nothing to read
+        return false;
+    }
+    memcpy(target, ring_buffer->mem + calc_pos(ring_buffer, ring_buffer->read_pos++), ring_buffer->object_size);
+    return true;
+};