From 3f78748ef357cbb128c96d7a07866f0953be1792 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Fri, 22 Jun 2007 12:33:54 -0300
Subject: traceback function moved to auxlib

---
 ldblib.c | 51 ++++++---------------------------------------------
 1 file changed, 6 insertions(+), 45 deletions(-)

(limited to 'ldblib.c')

diff --git a/ldblib.c b/ldblib.c
index d8224a8e..6a574187 100644
--- a/ldblib.c
+++ b/ldblib.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldblib.c,v 1.105 2006/09/11 14:07:24 roberto Exp roberto $
+** $Id: ldblib.c,v 1.106 2007/04/26 20:39:38 roberto Exp roberto $
 ** Interface from Lua to its debug API
 ** See Copyright Notice in lua.h
 */
@@ -315,55 +315,16 @@ static int db_debug (lua_State *L) {
 }
 
 
-#define LEVELS1	12	/* size of the first part of the stack */
-#define LEVELS2	10	/* size of the second part of the stack */
-
 static int db_errorfb (lua_State *L) {
-  lua_Debug ar;
-  int firstpart = 1;  /* still before eventual `...' */
   int arg;
   lua_State *L1 = getthread(L, &arg);
   const char *msg = lua_tostring(L, arg + 1);
-  int level = (lua_isnumber(L, arg + 2)) ?
-                     (int)lua_tointeger(L, arg + 2) :
-                     (L == L1) ? 1 : 0;  /* level 0 may be this own function */
-  lua_settop(L, ++arg);
-  if (msg) lua_pushfstring(L, "%s\n", msg);
-  else if (!lua_isnil(L, arg))  /* is there a non-string 'msg'? */
-    return 1;  /* return it untouched */
-  lua_pushliteral(L, "stack traceback:");
-  while (lua_getstack(L1, level++, &ar)) {
-    if (level > LEVELS1 && firstpart) {
-      /* no more than `LEVELS2' more levels? */
-      if (!lua_getstack(L1, level+LEVELS2, &ar))
-        level--;  /* keep going */
-      else {
-        lua_pushliteral(L, "\n\t...");  /* too many levels */
-        while (lua_getstack(L1, level+LEVELS2, &ar))  /* find last levels */
-          level++;
-      }
-      firstpart = 0;
-      continue;
-    }
-    lua_pushliteral(L, "\n\t");
-    lua_getinfo(L1, "Snl", &ar);
-    lua_pushfstring(L, "%s:", ar.short_src);
-    if (ar.currentline > 0)
-      lua_pushfstring(L, "%d:", ar.currentline);
-    if (*ar.namewhat != '\0')  /* is there a name? */
-        lua_pushfstring(L, " in function " LUA_QS, ar.name);
-    else {
-      if (*ar.what == 'm')  /* main? */
-        lua_pushfstring(L, " in main chunk");
-      else if (*ar.what == 'C' || *ar.what == 't')
-        lua_pushliteral(L, " ?");  /* C function or tail call */
-      else
-        lua_pushfstring(L, " in function <%s:%d>",
-                           ar.short_src, ar.linedefined);
-    }
-    lua_concat(L, lua_gettop(L) - arg);
+  if (msg == NULL && !lua_isnoneornil(L, arg + 1))  /* non-string 'msg'? */
+    lua_pushvalue(L, arg + 1);  /* return it untouched */
+  else {
+    int level = luaL_optint(L, arg + 2, (L == L1) ? 1 : 0);
+    luaL_traceback(L, L1, msg, level);
   }
-  lua_concat(L, lua_gettop(L) - arg);
   return 1;
 }
 
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