/* * libc/stdlib/malloc/heap_alloc_at.c -- allocate at a specific address * * Copyright (C) 2002 NEC Corporation * Copyright (C) 2002 Miles Bader <miles@gnu.org> * * This file is subject to the terms and conditions of the GNU Lesser * General Public License. See the file COPYING.LIB in the main * directory of this archive for more details. * * Written by Miles Bader <miles@gnu.org> */ #include <stdlib.h> #include "heap.h" /* Allocate SIZE bytes at address MEM in HEAP. Return the actual size allocated, or 0 if we failed. */ size_t __heap_alloc_at (struct heap_free_area **heap, void *mem, size_t size) { struct heap_free_area *fa; size_t alloced = 0; size = HEAP_ADJUST_SIZE (size); HEAP_DEBUG (*heap, "before __heap_alloc_at"); /* Look for a free area that can contain SIZE bytes. */ for (fa = *heap; fa; fa = fa->next) { void *fa_mem = HEAP_FREE_AREA_START (fa); if (fa_mem <= mem) { if (fa_mem == mem && fa->size >= size) /* FA has the right addr, and is big enough! */ alloced = __heap_free_area_alloc (heap, fa, size); break; } } HEAP_DEBUG (*heap, "after __heap_alloc_at"); return alloced; }