From c11d374c592d10b8ed649ffe501191039ee18757 Mon Sep 17 00:00:00 2001
From: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Date: Tue, 16 Apr 2002 14:08:28 -0300
Subject: [PATCH] `panic' function configurable via API

---
 lapi.c   | 11 ++++++++++-
 ldo.c    |  5 ++---
 lstate.c | 13 ++++++++++++-
 lstate.h |  3 ++-
 lua.h    |  4 +++-
 5 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/lapi.c b/lapi.c
index 9edc043f..72f38c93 100644
--- a/lapi.c
+++ b/lapi.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lapi.c,v 1.182 2002/04/02 20:43:18 roberto Exp roberto $
+** $Id: lapi.c,v 1.183 2002/04/05 18:54:31 roberto Exp roberto $
 ** Lua API
 ** See Copyright Notice in lua.h
 */
@@ -98,6 +98,15 @@ LUA_API int lua_checkstack (lua_State *L, int size) {
 }
 
 
+LUA_API lua_CFunction lua_setpanicf (lua_State *L, lua_CFunction panicf) {
+  lua_CFunction old;
+  lua_lock(L);
+  old = G(L)->panic;
+  G(L)->panic = panicf;
+  lua_unlock(L);
+  return old;
+}
+
 
 /*
 ** basic stack manipulation
diff --git a/ldo.c b/ldo.c
index fc0c4122..29276f1b 100644
--- a/ldo.c
+++ b/ldo.c
@@ -1,5 +1,5 @@
 /*
-** $Id: ldo.c,v 1.169 2002/04/10 12:10:54 roberto Exp roberto $
+** $Id: ldo.c,v 1.170 2002/04/15 19:34:42 roberto Exp roberto $
 ** Stack and Call structure of Lua
 ** See Copyright Notice in lua.h
 */
@@ -501,8 +501,7 @@ void luaD_breakrun (lua_State *L, int errcode) {
     longjmp(L->errorJmp->b, 1);
   }
   else {
-    if (errcode != LUA_ERRMEM && errcode != LUA_ERRERR)
-      message(L, "unable to recover; exiting\n");
+    G(L)->panic(L);
     exit(EXIT_FAILURE);
   }
 }
diff --git a/lstate.c b/lstate.c
index 7b7466d6..714fac6a 100644
--- a/lstate.c
+++ b/lstate.c
@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.c,v 1.87 2002/03/11 12:45:00 roberto Exp roberto $
+** $Id: lstate.c,v 1.88 2002/03/20 12:52:32 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -25,6 +25,16 @@
 static void close_state (lua_State *L);
 
 
+/*
+** you can change this function through the official API
+** call `lua_setpanicf'
+*/
+static int default_panic (lua_State *L) {
+  fprintf(stderr, "unable to recover; exiting\n");
+  return 0;
+}
+
+
 static void stack_init (lua_State *L, lua_State *OL) {
   L->stack = luaM_newvector(OL, BASIC_STACK_SIZE, TObject);
   L->stacksize = BASIC_STACK_SIZE;
@@ -52,6 +62,7 @@ static void f_luaopen (lua_State *L, void *ud) {
   G(L)->strt.hash = NULL;
   G(L)->Mbuffer = NULL;
   G(L)->Mbuffsize = 0;
+  G(L)->panic = &default_panic;
   G(L)->rootproto = NULL;
   G(L)->rootcl = NULL;
   G(L)->roottable = NULL;
diff --git a/lstate.h b/lstate.h
index 3bb3fa5d..6c2cfee9 100644
--- a/lstate.h
+++ b/lstate.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lstate.h,v 1.81 2002/03/26 20:46:10 roberto Exp roberto $
+** $Id: lstate.h,v 1.82 2002/04/10 12:11:07 roberto Exp roberto $
 ** Global State
 ** See Copyright Notice in lua.h
 */
@@ -112,6 +112,7 @@ typedef struct global_State {
   size_t Mbuffsize;  /* size of Mbuffer */
   lu_mem GCthreshold;
   lu_mem nblocks;  /* number of `bytes' currently allocated */
+  lua_CFunction panic;  /* to be called in unprotected errors */
   TString *tmname[TM_N];  /* array with tag-method names */
 } global_State;
 
diff --git a/lua.h b/lua.h
index 73e60082..4764e1d1 100644
--- a/lua.h
+++ b/lua.h
@@ -1,5 +1,5 @@
 /*
-** $Id: lua.h,v 1.125 2002/03/27 15:30:41 roberto Exp roberto $
+** $Id: lua.h,v 1.126 2002/04/05 18:54:31 roberto Exp roberto $
 ** Lua - An Extensible Extension Language
 ** TeCGraf: Grupo de Tecnologia em Computacao Grafica, PUC-Rio, Brazil
 ** e-mail: info@lua.org
@@ -100,6 +100,8 @@ LUA_API void       lua_close (lua_State *L);
 LUA_API lua_State *lua_newthread (lua_State *L);
 LUA_API void       lua_closethread (lua_State *L, lua_State *thread);
 
+LUA_API lua_CFunction lua_setpanicf (lua_State *L, lua_CFunction panicf);
+
 
 /*
 ** basic stack manipulation