+
−/*
+
−** $Id: lmem.c,v 1.70.1.1 2007/12/27 13:02:25 roberto Exp $
+
−** Interface to Memory Manager
+
−** See Copyright Notice in lua.h
+
−*/
+
−
+
−
+
−#include <stddef.h>
+
−
+
−#define lmem_c
+
−#define LUA_CORE
+
−
+
−#include "lua.h"
+
−
+
−#include "ldebug.h"
+
−#include "ldo.h"
+
−#include "lmem.h"
+
−#include "lobject.h"
+
−#include "lstate.h"
+
−
+
−
+
−
+
−/*
+
−** About the realloc function:
+
−** void * frealloc (void *ud, void *ptr, size_t osize, size_t nsize);
+
−** (`osize' is the old size, `nsize' is the new size)
+
−**
+
−** Lua ensures that (ptr == NULL) iff (osize == 0).
+
−**
+
−** * frealloc(ud, NULL, 0, x) creates a new block of size `x'
+
−**
+
−** * frealloc(ud, p, x, 0) frees the block `p'
+
−** (in this specific case, frealloc must return NULL).
+
−** particularly, frealloc(ud, NULL, 0, 0) does nothing
+
−** (which is equivalent to free(NULL) in ANSI C)
+
−**
+
−** frealloc returns NULL if it cannot create or reallocate the area
+
−** (any reallocation to an equal or smaller size cannot fail!)
+
−*/
+
−
+
−
+
−
+
−#define MINSIZEARRAY	4
+
−
+
−
+
−void *luaM_growaux_ (lua_State *L, void *block, int *size, size_t size_elems,
+
−                     int limit, const char *errormsg) {
+
−  void *newblock;
+
−  int newsize;
+
−  if (*size >= limit/2) {  /* cannot double it? */
+
−    if (*size >= limit)  /* cannot grow even a little? */
+
−      luaG_runerror(L, errormsg);
+
−    newsize = limit;  /* still have at least one free place */
+
−  }
+
−  else {
+
−    newsize = (*size)*2;
+
−    if (newsize < MINSIZEARRAY)
+
−      newsize = MINSIZEARRAY;  /* minimum size */
+
−  }
+
−  newblock = luaM_reallocv(L, block, *size, newsize, size_elems);
+
−  *size = newsize;  /* update only when everything else is OK */
+
−  return newblock;
+
−}
+
−
+
−
+
−void *luaM_toobig (lua_State *L) {
+
−  luaG_runerror(L, "memory allocation error: block too big");
+
−  return NULL;  /* to avoid warnings */
+
−}
+
−
+
−
+
−
+
−/*
+
−** generic allocation routine.
+
−*/
+
−void *luaM_realloc_ (lua_State *L, void *block, size_t osize, size_t nsize) {
+
−  global_State *g = G(L);
+
−  lua_assert((osize == 0) == (block == NULL));
+
−  block = (*g->frealloc)(g->ud, block, osize, nsize);
+
−  if (block == NULL && nsize > 0)
+
−    luaD_throw(L, LUA_ERRMEM);
+
−  lua_assert((nsize == 0) == (block == NULL));
+
−  g->totalbytes = (g->totalbytes - osize) + nsize;
+
−  return block;
+
−}
+
−