mirror of
https://github.com/lua/lua
synced 2024-11-22 04:41:23 +03:00
9a89fb1c9d
Hashes for long strings are computed only when they are used as keys in a table, not a too common case. And, in that case, it is to easy to force collisions changing only the characters which are not part of the hash.
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
/*
|
|
** $Id: lstring.h $
|
|
** String table (keep all strings handled by Lua)
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
#ifndef lstring_h
|
|
#define lstring_h
|
|
|
|
#include "lgc.h"
|
|
#include "lobject.h"
|
|
#include "lstate.h"
|
|
|
|
|
|
/*
|
|
** Memory-allocation error message must be preallocated (it cannot
|
|
** be created after memory is exhausted)
|
|
*/
|
|
#define MEMERRMSG "not enough memory"
|
|
|
|
|
|
/*
|
|
** Size of a TString: Size of the header plus space for the string
|
|
** itself (including final '\0').
|
|
*/
|
|
#define sizelstring(l) (offsetof(TString, contents) + ((l) + 1) * sizeof(char))
|
|
|
|
#define luaS_newliteral(L, s) (luaS_newlstr(L, "" s, \
|
|
(sizeof(s)/sizeof(char))-1))
|
|
|
|
|
|
/*
|
|
** test whether a string is a reserved word
|
|
*/
|
|
#define isreserved(s) ((s)->tt == LUA_VSHRSTR && (s)->extra > 0)
|
|
|
|
|
|
/*
|
|
** equality for short strings, which are always internalized
|
|
*/
|
|
#define eqshrstr(a,b) check_exp((a)->tt == LUA_VSHRSTR, (a) == (b))
|
|
|
|
|
|
LUAI_FUNC unsigned int luaS_hash (const char *str, size_t l, unsigned int seed);
|
|
LUAI_FUNC unsigned int luaS_hashlongstr (TString *ts);
|
|
LUAI_FUNC int luaS_eqlngstr (TString *a, TString *b);
|
|
LUAI_FUNC void luaS_resize (lua_State *L, int newsize);
|
|
LUAI_FUNC void luaS_clearcache (global_State *g);
|
|
LUAI_FUNC void luaS_init (lua_State *L);
|
|
LUAI_FUNC void luaS_remove (lua_State *L, TString *ts);
|
|
LUAI_FUNC Udata *luaS_newudata (lua_State *L, size_t s, int nuvalue);
|
|
LUAI_FUNC TString *luaS_newlstr (lua_State *L, const char *str, size_t l);
|
|
LUAI_FUNC TString *luaS_new (lua_State *L, const char *str);
|
|
LUAI_FUNC TString *luaS_createlngstrobj (lua_State *L, size_t l);
|
|
|
|
|
|
#endif
|