From d919e8cb785c165ee700907b74672eb586c55d29 Mon Sep 17 00:00:00 2001
From: Omniscient <17525998+omnisci3nce@users.noreply.github.com>
Date: Sun, 25 Feb 2024 13:31:17 +1100
Subject: add an arena reset to free everything

---
 src/std/mem.c | 10 +++++++---
 src/std/mem.h |  6 ++++--
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/src/std/mem.c b/src/std/mem.c
index c30f76d..419a712 100644
--- a/src/std/mem.c
+++ b/src/std/mem.c
@@ -9,8 +9,8 @@
 #endif
 
 void* arena_alloc_align(arena* a, size_t size, size_t align) {
-  ptrdiff_t padding = -(uintptr_t)a->begin & (align - 1);
-  ptrdiff_t available = a->end - a->begin - padding;
+  ptrdiff_t padding = -(uintptr_t)a->curr & (align - 1);
+  ptrdiff_t available = a->end - a->curr - padding;
   TRACE("Padding %td available %td", padding, available);
   if (available < 0 || (ptrdiff_t)size > available) {
     ERROR_EXIT("Arena ran out of memory\n");
@@ -22,5 +22,9 @@ void* arena_alloc_align(arena* a, size_t size, size_t align) {
 void* arena_alloc(arena* a, size_t size) { return arena_alloc_align(a, size, DEFAULT_ALIGNMENT); }
 
 arena arena_create(void* backing_buffer, size_t capacity) {
-  return (arena){ .begin = backing_buffer, .end = backing_buffer + (ptrdiff_t)capacity };
+  return (arena){ .begin = backing_buffer, .curr = backing_buffer, .end = backing_buffer + (ptrdiff_t)capacity };
+}
+
+void arena_free_all(arena *a) {
+  a->curr = a->begin; // pop everything at once and reset to the start.
 }
\ No newline at end of file
diff --git a/src/std/mem.h b/src/std/mem.h
index 75b6d2a..36d30bd 100644
--- a/src/std/mem.h
+++ b/src/std/mem.h
@@ -14,9 +14,11 @@
 // Inspired by https://nullprogram.com/blog/2023/09/27/
 typedef struct arena {
   char* begin;
+  char* curr;
   char* end;
 } arena;
 
 arena arena_create(void* backing_buffer, size_t capacity);
-void *arena_alloc(arena* a, size_t size);
-void *arena_alloc_align(arena* a, size_t size, size_t align);
+void* arena_alloc(arena* a, size_t size);
+void* arena_alloc_align(arena* a, size_t size, size_t align);
+void arena_free_all(arena* a);
\ No newline at end of file
-- 
cgit v1.2.3-70-g09d2


From 1d6be7975928e644e56422f3244aae5571f48ee0 Mon Sep 17 00:00:00 2001
From: Omniscient <17525998+omnisci3nce@users.noreply.github.com>
Date: Sun, 25 Feb 2024 13:31:44 +1100
Subject: chore: format

---
 src/std/mem.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/std/mem.c b/src/std/mem.c
index 419a712..f5b92d4 100644
--- a/src/std/mem.c
+++ b/src/std/mem.c
@@ -22,9 +22,11 @@ void* arena_alloc_align(arena* a, size_t size, size_t align) {
 void* arena_alloc(arena* a, size_t size) { return arena_alloc_align(a, size, DEFAULT_ALIGNMENT); }
 
 arena arena_create(void* backing_buffer, size_t capacity) {
-  return (arena){ .begin = backing_buffer, .curr = backing_buffer, .end = backing_buffer + (ptrdiff_t)capacity };
+  return (arena){ .begin = backing_buffer,
+                  .curr = backing_buffer,
+                  .end = backing_buffer + (ptrdiff_t)capacity };
 }
 
-void arena_free_all(arena *a) {
-  a->curr = a->begin; // pop everything at once and reset to the start.
+void arena_free_all(arena* a) {
+  a->curr = a->begin;  // pop everything at once and reset to the start.
 }
\ No newline at end of file
-- 
cgit v1.2.3-70-g09d2


From a1c3e27c53558fde411e63d8b3e3809c79789ea4 Mon Sep 17 00:00:00 2001
From: Omniscient <17525998+omnisci3nce@users.noreply.github.com>
Date: Sun, 25 Feb 2024 13:32:46 +1100
Subject: add TODO for future arena resize fn

---
 src/std/mem.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/std/mem.h b/src/std/mem.h
index 36d30bd..c3ec61d 100644
--- a/src/std/mem.h
+++ b/src/std/mem.h
@@ -21,4 +21,5 @@ typedef struct arena {
 arena arena_create(void* backing_buffer, size_t capacity);
 void* arena_alloc(arena* a, size_t size);
 void* arena_alloc_align(arena* a, size_t size, size_t align);
-void arena_free_all(arena* a);
\ No newline at end of file
+void arena_free_all(arena* a);
+// TODO: arena_resize
\ No newline at end of file
-- 
cgit v1.2.3-70-g09d2