arena allocator

include/lfmath.h

@@ -1,6 +1,8 @@
 #ifndef LIBFLINT_H_MATH
 #define LIBFLINT_H_MATH
 
+#include <stddef.h>
+
 #include "lfutility.h"
 
 int max_int(int a, int b);
@@ -11,6 +13,8 @@ int clamp_int(int i, int low, int high);
 
 int binstr_to_int(const char *s);
 
+int is_power_of_two(int i);
+
 Point *bresenham(int x0, int y0, int x1, int y1, size_t *sz);
 
 Point *bresenham_p(Point p1, Point p2, size_t *sz);

include/lfmemory.h

@@ -0,0 +1,20 @@
+#ifndef LIBFLINT_H_MEMORY
+#define LIBFLINT_H_MEMORY
+
+#include <stddef.h>
+
+typedef struct {
+    unsigned char* buf;
+    size_t buf_sz;
+    size_t offset_cur;
+    size_t offset_prev;
+} ArenaAllocator;
+
+void arena_init(ArenaAllocator *allocator, size_t buf_sz);
+void arena_free(ArenaAllocator *allocator);
+void *arena_malloc(ArenaAllocator* allocator, size_t size);
+void arena_resize_buf(ArenaAllocator *allocator, size_t new_sz);
+void *arena_resize(ArenaAllocator *allocator, void *mem, size_t old_sz, size_t new_sz);
+void arena_clear(ArenaAllocator *allocator);
+
+#endif // LIBFLINT_H_MEMORY