lmem.c
资源名称:wow.rar [点击查看]
上传用户:jxpjxmjjw
上传日期:2009-12-07
资源大小:5877k
文件大小:2k
源码类别:
模拟服务器
开发平台:
Visual C++
- /*
- ** $Id: lmem.c,v 1.1 2004/08/20 02:26:56 JH Exp $
- ** Interface to Memory Manager
- ** See Copyright Notice in lua.h
- */
- #include <stdlib.h>
- #define lmem_c
- #include "lua.h"
- #include "ldebug.h"
- #include "ldo.h"
- #include "lmem.h"
- #include "lobject.h"
- #include "lstate.h"
- /*
- ** definition for realloc function. It must assure that l_realloc(NULL,
- ** 0, x) allocates a new block (ANSI C assures that). (`os' is the old
- ** block size; some allocators may use that.)
- */
- #ifndef l_realloc
- #define l_realloc(b,os,s) realloc(b,s)
- #endif
- /*
- ** definition for free function. (`os' is the old block size; some
- ** allocators may use that.)
- */
- #ifndef l_free
- #define l_free(b,os) free(b)
- #endif
- #define MINSIZEARRAY 4
- void *luaM_growaux (lua_State *L, void *block, int *size, int size_elems,
- int limit, const char *errormsg) {
- void *newblock;
- int newsize = (*size)*2;
- if (newsize < MINSIZEARRAY)
- newsize = MINSIZEARRAY; /* minimum size */
- else if (*size >= limit/2) { /* cannot double it? */
- if (*size < limit - MINSIZEARRAY) /* try something smaller... */
- newsize = limit; /* still have at least MINSIZEARRAY free places */
- else luaG_runerror(L, errormsg);
- }
- newblock = luaM_realloc(L, block,
- cast(lu_mem, *size)*cast(lu_mem, size_elems),
- cast(lu_mem, newsize)*cast(lu_mem, size_elems));
- *size = newsize; /* update only when everything else is OK */
- return newblock;
- }
- /*
- ** generic allocation routine.
- */
- void *luaM_realloc (lua_State *L, void *block, lu_mem oldsize, lu_mem size) {
- lua_assert((oldsize == 0) == (block == NULL));
- if (size == 0) {
- if (block != NULL) {
- l_free(block, oldsize);
- block = NULL;
- }
- else return NULL; /* avoid `nblocks' computations when oldsize==size==0 */
- }
- else if (size >= MAX_SIZET)
- luaG_runerror(L, "memory allocation error: block too big");
- else {
- block = l_realloc(block, oldsize, size);
- if (block == NULL) {
- if (L)
- luaD_throw(L, LUA_ERRMEM);
- else return NULL; /* error before creating state! */
- }
- }
- if (L) {
- lua_assert(G(L) != NULL && G(L)->nblocks > 0);
- G(L)->nblocks -= oldsize;
- G(L)->nblocks += size;
- }
- return block;
- }