void *luaM_growaux_ (lua_State *L, void *block, int *size, size_t size_elems, int limit, const char *what) { void *newblock; int newsize; if (*size >= limit/2) { /* cannot double it? */ if (*size >= limit) /* cannot grow even a little? */ luaG_runerror(L, "too many %s (limit is %d)", what, limit); 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; }
NAMESPACE_LUA_BEGIN /* ** 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; }