commit 6d613817d4c94588260484f29e931c46bae1fc28
parent b8d412aa07278b3c4ef6ebc58d4b72045dffea3a
Author: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Mon, 20 Oct 2014 20:20:40 -0200
comments
Diffstat:
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/lua.c b/lua.c
@@ -1,5 +1,5 @@
/*
-** $Id: lua.c,v 1.215 2014/10/17 16:28:21 roberto Exp roberto $
+** $Id: lua.c,v 1.216 2014/10/20 18:19:26 roberto Exp roberto $
** Lua stand-alone interpreter
** See Copyright Notice in lua.h
*/
@@ -158,7 +158,8 @@ static void l_message (const char *pname, const char *msg) {
/*
** Check whether 'status' is not OK and, if so, prints the error
-** message on the top of the stack.
+** message on the top of the stack. It assumes that the error object
+** is a string, as it was either generated by Lua or by 'msghandler'.
*/
static int report (lua_State *L, int status) {
if (status != LUA_OK) {
@@ -176,15 +177,15 @@ static int report (lua_State *L, int status) {
static int msghandler (lua_State *L) {
const char *msg = lua_tostring(L, 1);
if (msg == NULL) { /* is error object not a string? */
- if (luaL_callmeta(L, 1, "__tostring") && /* did have a metamethod */
- lua_type(L, -1) == LUA_TSTRING) /* and it produce a string? */
+ if (luaL_callmeta(L, 1, "__tostring") && /* does it have a metamethod */
+ lua_type(L, -1) == LUA_TSTRING) /* that produces a string? */
return 1; /* that is the message */
else
msg = lua_pushfstring(L, "(error object is a %s value)",
luaL_typename(L, 1));
}
luaL_traceback(L, L, msg, 1); /* append a standard traceback */
- return 1;
+ return 1; /* return the traceback */
}