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better control of overflows in size computations

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Roberto Ierusalimschy
2004-12-01 13:46:18 -02:00
parent 0ed8519127
commit 97e2dab1fb
3 changed files with 35 additions and 32 deletions
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22
lmem.h
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@@ -1,5 +1,5 @@
/*
** $Id: lmem.h,v 1.27 2004/11/19 15:52:40 roberto Exp roberto $
** $Id: lmem.h,v 1.28 2004/11/24 19:20:21 roberto Exp roberto $
** Interface to Memory Manager
** See Copyright Notice in lua.h
*/
@@ -16,31 +16,31 @@
#define MEMERRMSG "not enough memory"
void *luaM_realloc (lua_State *L, void *block, size_t oldsize, size_t size);
void *luaM_realloc_ (lua_State *L, void *block, size_t oldsize, size_t size);
void *luaM_toobig (lua_State *L);
#define luaM_reallocv(L,b,on,n,e) \
((cast(size_t, (n)+1) <= MAX_SIZET/(e)) ? /* +1 only to avoid warnings */ \
luaM_realloc(L, (b), (on)*(e), (n)*(e)) : \
((cast(unsigned int, (n)+1) <= MAX_SIZET/(e)) ? /* +1 to avoid warnings */ \
luaM_realloc_(L, (b), (on)*(e), (n)*(e)) : \
luaM_toobig(L))
void *luaM_growaux (lua_State *L, void *block, int *size, size_t size_elem,
int limit, const char *errormsg);
void *luaM_growaux_ (lua_State *L, void *block, int *size, size_t size_elem,
int limit, const char *errormsg);
#define luaM_freemem(L, b, s) luaM_realloc(L, (b), (s), 0)
#define luaM_free(L, b) luaM_realloc(L, (b), sizeof(*(b)), 0)
#define luaM_freemem(L, b, s) luaM_realloc_(L, (b), (s), 0)
#define luaM_free(L, b) luaM_realloc_(L, (b), sizeof(*(b)), 0)
#define luaM_freearray(L, b, n, t) luaM_reallocv(L, (b), n, 0, sizeof(t))
#define luaM_malloc(L,t) luaM_realloc(L, NULL, 0, (t))
#define luaM_malloc(L,t) luaM_realloc_(L, NULL, 0, (t))
#define luaM_new(L,t) cast(t *, luaM_malloc(L, sizeof(t)))
#define luaM_newvector(L,n,t) \
cast(t *, luaM_reallocv(L, NULL, 0, n, sizeof(t)))
#define luaM_growvector(L,v,nelems,size,t,limit,e) \
if (((nelems)+1) > (size)) \
((v)=cast(t *, luaM_growaux(L,v,&(size),sizeof(t),limit,e)))
if ((nelems)+1 > (size)) \
((v)=cast(t *, luaM_growaux_(L,v,&(size),sizeof(t),limit,e)))
#define luaM_reallocvector(L, v,oldn,n,t) \
((v)=cast(t *, luaM_reallocv(L, v, oldn, n, sizeof(t))))