From 7d2ab3a71f4bda9d8ee997764d98b29e13a902c5 Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Mon, 29 Apr 2024 18:00:20 +0200
Subject: Kernel/Socket: Move sockets back to being file descriptors

---
 kernel/lib/ringbuffer.c | 17 +++++++++++++++++
 kernel/lib/ringbuffer.h |  3 +++
 kernel/lib/stack.c      |  4 ++++
 kernel/lib/stack.h      |  1 +
 4 files changed, 25 insertions(+)

(limited to 'kernel/lib')

diff --git a/kernel/lib/ringbuffer.c b/kernel/lib/ringbuffer.c
index 66dd17e..9caf555 100644
--- a/kernel/lib/ringbuffer.c
+++ b/kernel/lib/ringbuffer.c
@@ -16,6 +16,23 @@ int ringbuffer_init(struct ringbuffer *rb, u32 buffer_size) {
   return 1;
 }
 
+u32 ringbuffer_used(const struct ringbuffer *rb) {
+  if (rb->write_ptr < rb->read_ptr) {
+    u32 c = rb->buffer_size - rb->read_ptr;
+    c += rb->write_ptr;
+    return c;
+  }
+  return rb->write_ptr - rb->read_ptr;
+}
+
+u32 ringbuffer_capacity(const struct ringbuffer *rb) {
+  return rb->buffer_size - 1;
+}
+
+u32 ringbuffer_unused(const struct ringbuffer *rb) {
+  return ringbuffer_capacity(rb) - ringbuffer_used(rb);
+}
+
 u32 ringbuffer_write(struct ringbuffer *rb, const u8 *buffer, u32 len) {
   const u32 orig_len = len;
   for (; len > 0;) {
diff --git a/kernel/lib/ringbuffer.h b/kernel/lib/ringbuffer.h
index 3ebc507..d6e699a 100644
--- a/kernel/lib/ringbuffer.h
+++ b/kernel/lib/ringbuffer.h
@@ -14,6 +14,9 @@ u32 ringbuffer_write(struct ringbuffer *rb, const u8 *buffer, u32 len);
 u32 ringbuffer_read(struct ringbuffer *rb, u8 *buffer, u32 len);
 int ringbuffer_isempty(const struct ringbuffer *rb);
 void ringbuffer_free(struct ringbuffer *rb);
+u32 ringbuffer_used(const struct ringbuffer *rb);
+u32 ringbuffer_capacity(const struct ringbuffer *rb);
+u32 ringbuffer_unused(const struct ringbuffer *rb);
 #ifdef KERNEL_TEST
 void ringbuffer_test(void);
 #endif // KERNEL_TEST
diff --git a/kernel/lib/stack.c b/kernel/lib/stack.c
index 7283b35..7c44193 100644
--- a/kernel/lib/stack.c
+++ b/kernel/lib/stack.c
@@ -7,6 +7,10 @@ void stack_init(struct stack *s) {
   s->head = NULL;
 }
 
+int stack_isempty(const struct stack *s) {
+  return (NULL == s->head);
+}
+
 // 1 = Success
 // 0 = Failure
 int stack_push(struct stack *s, void *data) {
diff --git a/kernel/lib/stack.h b/kernel/lib/stack.h
index f47fe66..09fff66 100644
--- a/kernel/lib/stack.h
+++ b/kernel/lib/stack.h
@@ -13,6 +13,7 @@ struct stack {
 };
 
 void stack_init(struct stack *s);
+int stack_isempty(const struct stack *s);
 int stack_push(struct stack *s, void *data);
 void *stack_pop(struct stack *s);
 #endif
-- 
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