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avoid non-raw accesses to globals when variable may not exist

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Roberto Ierusalimschy
2002-12-04 13:38:25 -02:00
parent 90d7892007
commit 76de732745
2 changed files with 12 additions and 7 deletions
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11
lua.c
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@@ -1,5 +1,5 @@
/*
** $Id: lua.c,v 1.109 2002/11/19 13:49:43 roberto Exp roberto $
** $Id: lua.c,v 1.110 2002/11/25 17:47:13 roberto Exp roberto $
** Lua stand-alone interpreter
** See Copyright Notice in lua.h
*/
@@ -121,7 +121,8 @@ static int report (int status) {
static int lcall (int narg, int clear) {
int status;
int base = lua_gettop(L) - narg; /* function index */
lua_getglobal(L, "_TRACEBACK"); /* get traceback function */
lua_pushliteral(L, "_TRACEBACK");
lua_rawget(L, LUA_GLOBALSINDEX); /* get traceback function */
lua_insert(L, base); /* put it under chunk and args */
signal(SIGINT, laction);
status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
@@ -175,7 +176,8 @@ static int dostring (const char *s, const char *name) {
static int load_file (const char *name) {
lua_getglobal(L, "require");
lua_pushliteral(L, "require");
lua_rawget(L, LUA_GLOBALSINDEX);
if (!lua_isfunction(L, -1)) { /* no `require' defined? */
lua_pop(L, 1);
return file_input(name);
@@ -228,7 +230,8 @@ static int readline (lua_State *l, const char *prompt) {
static const char *get_prompt (int firstline) {
const char *p = NULL;
lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
lua_pushstring(L, firstline ? "_PROMPT" : "_PROMPT2");
lua_rawget(L, LUA_GLOBALSINDEX);
p = lua_tostring(L, -1);
if (p == NULL) p = (firstline ? PROMPT : PROMPT2);
lua_pop(L, 1); /* remove global */