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Remove block header from allocated blocks entirely

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Imbus 2025-09-08 07:52:41 +02:00
parent 8f41b0873d
commit 13a0d42514
1 changed files with 5 additions and 3 deletions
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8
freelist/freelist.c
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@ -4,10 +4,11 @@
#include <stdint.h> #include <stdint.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h>
/* Initialize the FreeList */ /* Initialize the FreeList */
int fl_init(FreeList *fl, uintptr_t start, uintptr_t end, size_t itemsize) { int fl_init(FreeList *fl, uintptr_t start, uintptr_t end, size_t itemsize) {
size_t size = ALIGN(itemsize + sizeof(FreeListBlock)); size_t size = ALIGN(itemsize);
if (!fl || end <= start) if (!fl || end <= start)
return EXIT_FAILURE; return EXIT_FAILURE;
@ -39,7 +40,8 @@ void *fl_alloc(FreeList *fl) {
fl->free = fl->free->next; fl->free = fl->free->next;
fl->allocated++; fl->allocated++;
return ((void *)m) + sizeof(FreeListBlock); memset((void *)m, 0, sizeof(FreeListBlock));
return ((void *)m);
} }
/* Return some memory to the FreeList */ /* Return some memory to the FreeList */
@ -48,7 +50,7 @@ int fl_free(FreeList *fl, void *ptr) {
return EXIT_FAILURE; /* We cant free memory we do not own */ return EXIT_FAILURE; /* We cant free memory we do not own */
} }
FreeListBlock *block = (FreeListBlock *)((uintptr_t)ptr - sizeof(FreeListBlock)); FreeListBlock *block = (FreeListBlock *)(uintptr_t)ptr;
block->next = fl->free; block->next = fl->free;
fl->free = block; fl->free = block;