fix a bug with dirname seg faulting when passed a string literal

it doesnt like things in readonly memory i guess.

now we create an arena for the obj load and create a dynamically allocated copy of the string

2 files changed, 5 insertions, 2 deletions

diff --git a/src/std/mem.c b/src/std/mem.c
index f5b92d4..d7c0f4c 100644
--- a/src/std/mem.c
+++ b/src/std/mem.c
@@ -16,7 +16,7 @@ void* arena_alloc_align(arena* a, size_t size, size_t align) {
     ERROR_EXIT("Arena ran out of memory\n");
   }
   void* p = a->begin + padding;
-  a->begin += padding + size;
+  a->curr += padding + size;
   return memset(p, 0, size);
 }
 void* arena_alloc(arena* a, size_t size) { return arena_alloc_align(a, size, DEFAULT_ALIGNMENT); }
@@ -29,4 +29,6 @@ arena arena_create(void* backing_buffer, size_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
+}
+
+void arena_free_storage(arena* a) { free(a->begin); }
\ No newline at end of file
diff --git a/src/std/mem.h b/src/std/mem.h
index c3ec61d..2f92894 100644
--- a/src/std/mem.h
+++ b/src/std/mem.h
@@ -22,4 +22,5 @@ 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);
+void arena_free_storage(arena* a);
 // TODO: arena_resize
\ No newline at end of file