diff options
Diffstat (limited to 'libc/src/malloc.c')
| -rw-r--r-- | libc/src/malloc.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/libc/src/malloc.c b/libc/src/malloc.c index 95181ac..2b8a806 100644 --- a/libc/src/malloc.c +++ b/libc/src/malloc.c @@ -163,6 +163,7 @@ void free(void * ptr) { if (!ptr || !head) return; + // First block; bumping head ahead. if (ptr == head->ptr) { size = head->size + (size_t) (head->ptr - (void *) head); head = head->next; @@ -177,17 +178,20 @@ void free(void * ptr) { return; } + // Finding the proper block cur = head; for (cur = head; ptr != cur->ptr; cur = cur->next) if (!cur->next) return; if (cur->next) { + // In the middle, just unlink it cur->next->prev = cur->prev; } else { + // At the end, shrink heap tail = cur->prev; top = sbrk(0); - size = (uintptr_t) top - (uintptr_t) cur->prev->ptr + cur->prev->size; + size = (top - cur->prev->ptr) - cur->prev->size; sbrk(-size); } |