133 lines
3.1 KiB
C
133 lines
3.1 KiB
C
/* $OpenBSD: alloc.c,v 1.8 2008/07/21 17:30:08 millert Exp $ */
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/*-
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* Copyright (c) 2002 Marc Espie.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
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* PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*-
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* area-based allocation built on malloc/free
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*/
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#include "sh.h"
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__RCSID("$MirOS: src/bin/mksh/alloc.c,v 1.13 2008/12/13 17:02:11 tg Exp $");
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struct link {
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struct link *prev;
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struct link *next;
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};
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Area *
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ainit(Area *ap)
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{
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ap->freelist = NULL;
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return (ap);
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}
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void
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afreeall(Area *ap)
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{
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struct link *l, *l2;
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for (l = ap->freelist; l != NULL; l = l2) {
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l2 = l->next;
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free(l);
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}
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ap->freelist = NULL;
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}
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#define L2P(l) ( (void *)(((char *)(l)) + sizeof (struct link)) )
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#define P2L(p) ( (struct link *)(((ptrdiff_t)(p)) - sizeof (struct link)) )
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void *
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alloc(size_t size, Area *ap)
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{
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struct link *l;
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if ((l = malloc(sizeof (struct link) + size)) == NULL)
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internal_errorf("unable to allocate memory");
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l->next = ap->freelist;
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l->prev = NULL;
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if (ap->freelist)
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ap->freelist->prev = l;
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ap->freelist = l;
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return (L2P(l));
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}
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void *
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aresize(void *ptr, size_t size, Area *ap)
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{
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struct link *l, *l2, *lprev, *lnext;
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if (ptr == NULL)
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return (alloc(size, ap));
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l = P2L(ptr);
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lprev = l->prev;
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lnext = l->next;
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if ((l2 = realloc(l, sizeof (struct link) + size)) == NULL)
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internal_errorf("unable to allocate memory");
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if (lprev)
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lprev->next = l2;
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else
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ap->freelist = l2;
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if (lnext)
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lnext->prev = l2;
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return (L2P(l2));
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}
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void
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afree(void *ptr, Area *ap)
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{
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struct link *l;
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#ifdef MKSH_AFREE_DEBUG
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struct link *lp;
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#endif
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if (!ptr)
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return;
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l = P2L(ptr);
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#ifdef MKSH_AFREE_DEBUG
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for (lp = ap->freelist; lp != NULL; lp = lp->next)
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if (l == lp)
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break;
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if (lp == NULL) {
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internal_warningf("afree: pointer %p not allocated", ptr);
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exit(255);
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}
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#endif
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if (l->prev)
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l->prev->next = l->next;
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else
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ap->freelist = l->next;
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if (l->next)
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l->next->prev = l->prev;
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free(l);
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}
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