diff options
Diffstat (limited to 'arena.h')
| -rw-r--r-- | arena.h | 12 |
1 files changed, 8 insertions, 4 deletions
@@ -58,6 +58,7 @@ typedef struct Region uint32_t size, capacity; uint8_t bytes[]; } region_t; +#define MIN(A, B) ((A) < (B) ? (A) : (B)) region_t *region_make(uint32_t capacity, region_t *next) { @@ -91,7 +92,7 @@ uint8_t *region_alloc_rec(region_t *region, uint32_t capacity) return start; } -void region_delete(region_t *region) +void region_delete_rec(region_t *region) { while (region) { @@ -130,17 +131,18 @@ uint8_t *arena_realloc(arena_t *arena, uint8_t *pointer, uint32_t old_size, // pointer isn't allocated in the arena return NULL; + int cleanup = 0; uint8_t *new_ptr = NULL; if (old_size == reg->size && reg->capacity == reg->size) { // Completely filled region, may as well reallocate + cleanup = 1; region_t *new_reg = region_make(new_size * REGION_CAPACITY_MULT, reg->next); // Chain this new region in place if (prev) prev->next = new_reg; if (reg == arena->end) arena->end = new_reg; - free(reg); new_ptr = new_reg->bytes; new_reg->size += new_size; } @@ -149,13 +151,15 @@ uint8_t *arena_realloc(arena_t *arena, uint8_t *pointer, uint32_t old_size, // Allocate a new portion of memory on the arena new_ptr = arena_alloc(arena, new_size); } - memcpy(new_ptr, pointer, old_size); + memcpy(new_ptr, pointer, MIN(old_size, new_size)); + if (cleanup) + free(reg); return new_ptr; } void arena_free(arena_t *arena) { - region_delete(arena->beg); + region_delete_rec(arena->beg); memset(arena, 0, sizeof(*arena)); } |