allow opening multiple files at once + replace modes

1 files changed, 5 insertions, 0 deletions

diff --git a/arena.h b/arena.h
index 3887c6c..a5cc3dd 100644
--- a/arena.h
+++ b/arena.h
@@ -21,6 +21,7 @@ void vmem_free(void *ptr, size_t sz);
 
 Arena arena_init(size_t sz);
 void arena_free(Arena *a);
+void arena_reset(Arena *a);
 void *arena_alloc(Arena *a, size_t n, size_t align);
 void *arena_realloc(Arena *a, void *old, size_t oldsz, size_t newsz, size_t align);
 
@@ -64,6 +65,10 @@ void arena_free(Arena *a) {
 	vmem_free(a->start, a->end - a->start);
 }
 
+void arena_reset(Arena *a) {
+	a->beg = a->start;
+}
+
 void *arena_alloc(Arena *a, size_t sz, size_t align) {
 	char *p = a->beg + (-(uintptr_t)a->beg & (align - 1));
 	if (p + sz > a->end) FAIL_WITH_MSG("arena out-of-memory");