Function luaL_where

depends/lua/src/lauxlib.c:205–215

** The use of 'lua_pushfstring' ensures this function does not ** need reserved stack space when called. */

** need reserved stack space when called.
*/
LUALIB_API void luaL_where (lua_State *L, int level) {
  lua_Debug ar;
  if (lua_getstack(L, level, &ar)) {  /* check function at level */
    lua_getinfo(L, "Sl", &ar);  /* get info about it */
    if (ar.currentline > 0) {  /* is there info? */
      lua_pushfstring(L, "%s:%d: ", ar.short_src, ar.currentline);
      return;
    }
  }
  lua_pushfstring(L, "");  /* else, no information available... */
}


/*