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272 lines
7.0 KiB
C
272 lines
7.0 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef __DS_h_
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#define __DS_h_
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#ifdef XP_WIN32
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#include <windows.h>
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#endif /* XP_WIN32 */
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#ifdef XP_OS2
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#define INCL_WIN
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#define INCL_GPI
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#define TID OS2TID /* global rename in OS2 H's! */
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#include <os2.h>
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#undef TID /* and restore */
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#endif
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#include "xp_mcom.h"
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XP_BEGIN_PROTOS
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/* Typedefs */
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typedef struct DSArrayStr DSArray;
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typedef struct DSLinkStr DSLink;
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typedef struct DSListStr DSList;
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typedef struct DSArenaStr DSArena;
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#define DS_MIN(a,b) ((a)<(b)?(a):(b))
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#define DS_MAX(a,b) ((a)>(b)?(a):(b))
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/*
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** Your basic boolean. Done as an enum to cause compiler warnings when a
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** boolean procedure doesn't return the right value.
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** LISA SEZ: Please do not use this; use PRBool instead. Eventually
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** (as soon as I can "make it so") DSBool is going away in favor of PRBool.
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*/
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typedef enum DSBoolEnum {
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DSTrue = 1,
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DSFalse = 0
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} DSBool;
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/*
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** A status code. Status's are used by procedures that return status
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** values. Again the motivation is so that a compiler can generate
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** warnings when return values are wrong. Correct testing of status codes:
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**
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** DSStatus rv;
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** rv = some_function (some_argument);
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** if (rv != DSSuccess)
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** do_an_error_thing();
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**
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*/
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typedef enum DSStatusEnum {
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DSWouldBlock = -2,
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DSFailure = -1,
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DSSuccess = 0
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} DSStatus;
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/*
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** A comparison code. Used for procedures that return comparision
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** values. Again the motivation is so that a compiler can generate
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** warnings when return values are wrong.
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*/
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typedef enum DSComparisonEnum {
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DSLessThan = -1,
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DSEqual = 0,
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DSGreaterThan = 1
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} DSComparison;
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typedef void (*DSElementFreeFunc)(void *e1, DSBool freeit);
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typedef int (*DSElementCompareFunc)(void *e1, void *e2);
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/************************************************************************/
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/*
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** Simple variable length array of pointers. The array keeps a NULL
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** pointer at the end of the array.
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*/
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struct DSArrayStr {
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void **things;
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DSElementFreeFunc freeElement;
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};
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extern DSArray *DS_CreateArray(int slots);
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extern DSStatus DS_GrowArray(DSArray *da, int slots);
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extern void DS_SetArrayMethods(DSArray *da, DSElementFreeFunc freeFunc);
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extern void DS_DestroyArray(DSArray *da, DSBool freeit);
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extern void DS_Sort(DSArray *da, DSElementCompareFunc compare);
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extern int DS_Elements(DSArray *da);
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extern DSStatus DS_AddElement(DSArray *da, void *element);
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extern void DS_RemoveElement(DSArray *da, void *element);
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/************************************************************************/
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/*
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** Circular linked list. Each link contains a pointer to the object that
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** is actually in the list.
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*/
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struct DSLinkStr {
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DSLink *next;
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DSLink *prev;
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void *thing;
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};
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struct DSListStr {
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DSLink link;
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};
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#define DS_InitList(lst) \
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{ \
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(lst)->link.next = &(lst)->link; \
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(lst)->link.prev = &(lst)->link; \
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(lst)->link.thing = 0; \
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}
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#define DS_ListEmpty(lst) \
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((lst)->link.next == &(lst)->link)
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#define DS_ListHead(lst) \
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((lst)->link.next)
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#define DS_ListTail(lst) \
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((lst)->link.prev)
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#define DS_ListIterDone(lst,lnk) \
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((lnk) == &(lst)->link)
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#define DS_AppendLink(lst,lnk) \
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{ \
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(lnk)->next = &(lst)->link; \
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(lnk)->prev = (lst)->link.prev; \
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(lst)->link.prev->next = (lnk); \
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(lst)->link.prev = (lnk); \
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}
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#define DS_InsertLink(lst,lnk) \
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{ \
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(lnk)->next = (lst)->link.next; \
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(lnk)->prev = &(lst)->link; \
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(lst)->link.next->prev = (lnk); \
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(lst)->link.next = (lnk); \
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}
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#define DS_RemoveLink(lnk) \
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{ \
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(lnk)->next->prev = (lnk)->prev; \
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(lnk)->prev->next = (lnk)->next; \
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(lnk)->next = 0; \
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(lnk)->prev = 0; \
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}
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extern DSLink *DS_NewLink(void *thing);
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extern DSLink *DS_FindLink(DSList *lst, void *thing);
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extern void DS_DestroyLink(DSLink *lnk, DSBool freeit);
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/************************************************************************/
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/*
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** Memory manager
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*/
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/*
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** at one time XP_Block was a float* to force clients to cast things
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** before use. Now DSBlock is defined since that will be most convenient
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** for almost all uses.
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*/
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typedef unsigned char *DSBlock;
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/*
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** Allocate some memory. Always allocates at least one byte of memory.
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*/
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extern void *DS_Alloc(size_t bytes);
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/*
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** Reallocate some memory, growing or shrinking the memory.
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*/
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extern void *DS_Realloc(void *oldptr, size_t bytes);
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/*
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** Allocate and then zero some memory. Always allocates at least one byte
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** of memory.
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*/
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extern void *DS_Zalloc(size_t bytes);
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/*
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** Allocate a block of memory. Always allocates at least one byte of
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** memory.
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*/
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extern DSBlock DS_AllocBlock(size_t bytes);
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/*
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** Reallocate a block of memory, growing or shrinking the memory block.
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*/
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extern DSBlock DS_ReallocBlock(DSBlock block, size_t newBytes);
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/*
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** Free a block of memory. Safe to use on null pointers.
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*/
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extern void DS_FreeBlock(DSBlock block);
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/*
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** Free a chunk of memory. Safe to use on null pointers.
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*/
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extern void DS_Free(void *ptr);
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/*
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** Zero and then free a chunk of memory. Safe to use on null pointers.
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*/
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extern void DS_Zfree(void *ptr, size_t bytes);
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/*
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* Low cost Malloc Arenas.
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*
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* The chunks are a linked list.
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* The beginning of each chunk is a pointer to the next chunk.
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*/
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struct DSArenaStr {
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unsigned long chunkSize; /* size of each chunk */
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unsigned int refCount; /* reference count */
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void ** firstChunk; /* pointer to first chunk */
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void ** lastChunk; /* pointer to last chunk */
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void * pLast; /* last item allocated */
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void * pCur; /* beginning of free area */
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void * pCurEnd; /* end of free area in current chunk */
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};
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/* make a new arena */
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extern DSArena *
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DS_NewArena(unsigned long chunkSize);
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/* destroy an arena, and free all memory associated with it */
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extern void
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DS_FreeArena(DSArena *arena, DSBool zero);
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/* malloc a chunk of data from the arena */
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extern void *
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DS_ArenaAlloc(DSArena *arena, unsigned long size);
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/* malloc a chunk of data from the arena, zero filling it */
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extern void *
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DS_ArenaZalloc(DSArena *arena, unsigned long size);
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/* change the size of an object, works best if it was the last object
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* allocated
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*/
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extern void *
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DS_ArenaGrow(DSArena *arena, void *pOld, unsigned long oldsize,
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unsigned long newsize);
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XP_END_PROTOS
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#endif /* __DS_h_ */
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