Merged revisions 309541 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

........
  r309541 | mnicholson | 2011-03-04 12:59:20 -0600 (Fri, 04 Mar 2011) | 4 lines
  
  Check for errors from fseek() when loading config file, properly abort on errors from fread(), and supply a traceback for errors generated when loading the config file.
  
  Also, prepend a newline to traceback output so that the main error message is on it's own line.
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@309542 65c4cc65-6c06-0410-ace0-fbb531ad65f3

pbx/pbx_lua.c

@@ -736,6 +736,9 @@ static int lua_error_function(lua_State *L)
 	 * backtrace to it */
 	message_index = lua_gettop(L);
 
+	/* prepare to prepend a new line to the traceback */
+	lua_pushliteral(L, "\n");
+
 	lua_getglobal(L, "debug");
 	lua_getfield(L, -1, "traceback");
 	lua_remove(L, -2); /* remove the 'debug' table */
@@ -747,6 +750,9 @@ static int lua_error_function(lua_State *L)
 
 	lua_call(L, 2, 1);
 
+	/* prepend the new line we prepared above */
+	lua_concat(L, 2);
+
 	return 1;
 }
 
@@ -920,6 +926,7 @@ static int lua_extension_cmp(lua_State *L)
 static char *lua_read_extensions_file(lua_State *L, long *size)
 {
 	FILE *f;
+	int error_func;
 	char *data;
 	char *path = alloca(strlen(config) + strlen(ast_config_AST_CONFIG_DIR) + 2);
 	sprintf(path, "%s/%s", ast_config_AST_CONFIG_DIR, config);
@@ -934,10 +941,20 @@ static char *lua_read_extensions_file(lua_State *L, long *size)
 		return NULL;
 	}
 
-	fseek(f, 0l, SEEK_END);
+	if (fseek(f, 0l, SEEK_END)) {
+		fclose(f);
+		lua_pushliteral(L, "error determining the size of the config file");
+		return NULL;
+	}
+
 	*size = ftell(f);
 
-	fseek(f, 0l, SEEK_SET);
+	if (fseek(f, 0l, SEEK_SET)) {
+		*size = 0;
+		fclose(f);
+		lua_pushliteral(L, "error reading config file");
+		return NULL;
+	}
 
 	if (!(data = ast_malloc(*size))) {
 		*size = 0;
@@ -947,18 +964,26 @@ static char *lua_read_extensions_file(lua_State *L, long *size)
 	}
 
 	if (fread(data, sizeof(char), *size, f) != *size) {
-		ast_log(LOG_WARNING, "fread() failed: %s\n", strerror(errno));
+		*size = 0;
+		fclose(f);
+		lua_pushliteral(L, "problem reading configuration file");
+		return NULL;
 	}
 	fclose(f);
 
+	lua_pushcfunction(L, &lua_error_function);
+	error_func = lua_gettop(L);
+
 	if (luaL_loadbuffer(L, data, *size, "extensions.lua")
-			|| lua_pcall(L, 0, LUA_MULTRET, 0)
+			|| lua_pcall(L, 0, LUA_MULTRET, error_func)
 			|| lua_sort_extensions(L)
 			|| lua_register_switches(L)) {
 		ast_free(data);
 		data = NULL;
 		*size = 0;
 	}
+
+	lua_remove(L, error_func);
 	return data;
 }