Re: lua bug - loadfile gets stdin confused

["Mark Edgar" <medgar123@...>]

The obvious (?) fix to this bug:

--- -   2007-04-17 10:46:22.525585000 -0700
+++ lua-5.1.2/src/lauxlib.c     2007-04-17 10:36:38.000000000 -0700
@@ -554,8 +554,9 @@
  int status, readstatus;
  int c;
  int fnameindex = lua_gettop(L) + 1;  /* index of filename on the stack */
+  int usestdin = filename == NULL;
  lf.extraline = 0;
-  if (filename == NULL) {
+  if (usestdin) {
    lua_pushliteral(L, "=stdin");
    lf.f = stdin;
  }
@@ -570,7 +571,7 @@
    while ((c = getc(lf.f)) != EOF && c != '\n') ;  /* skip first line */
    if (c == '\n') c = getc(lf.f);
  }
-  if (c == LUA_SIGNATURE[0] && lf.f != stdin) {  /* binary file? */
+  if (c == LUA_SIGNATURE[0] && !usestdin) {  /* binary file? */
    fclose(lf.f);
    lf.f = fopen(filename, "rb");  /* reopen in binary mode */
    if (lf.f == NULL) return errfile(L, "reopen", fnameindex);
@@ -581,7 +582,7 @@
  ungetc(c, lf.f);
  status = lua_load(L, getF, &lf, lua_tostring(L, -1));
  readstatus = ferror(lf.f);
-  if (lf.f != stdin) fclose(lf.f);  /* close file (even in case of errors) */
+  if (!usestdin) fclose(lf.f);  /* close file (even in case of errors) */
  if (readstatus) {
    lua_settop(L, fnameindex);  /* ignore results from `lua_load' */
    return errfile(L, "read", fnameindex);

Also, I'm certain that the same bug lies in wait here too, and the fix
isn't nearly as obvious:

http://www.lua.org/source/5.1/liolib.c.html#io_gc

    -Mark