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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#include "grub_lib.h"
#include <grub/dl.h>
#include <grub/command.h>
#include <grub/i18n.h>
#include <grub/misc.h>
#include <grub/normal.h>
GRUB_MOD_LICENSE("GPLv3+");
static const char *
scan_str (const char *s1, const char *s2)
{
while (*s1)
{
const char *p = s2;
while (*p)
{
if (*s1 == *p)
return s1;
p++;
}
s1++;
}
return s1;
}
int
strcspn (const char *s1, const char *s2)
{
const char *r;
r = scan_str (s1, s2);
return r - s1;
}
char *
strpbrk (const char *s1, const char *s2)
{
const char *r;
r = scan_str (s1, s2);
return (*r) ? (char *) r : 0;
}
static lua_State *state;
/* Call `grub_error' to report a Lua error. The error message string must be
on the top of the Lua stack (at index -1). The error message is popped off
the Lua stack before this function returns. */
static void
handle_lua_error (const char *error_type)
{
const char *error_msg;
error_msg = lua_tostring (state, -1);
if (error_msg == NULL)
error_msg = "(error message not a string)";
grub_error (GRUB_ERR_BAD_ARGUMENT, "%s: %s", error_type, error_msg);
/* Pop the error message. */
lua_pop (state, 1);
}
/* Taken from lua.c */
static int
incomplete (lua_State * L, int status)
{
if (status == LUA_ERRSYNTAX)
{
size_t lmsg;
const char *msg = lua_tolstring (L, -1, &lmsg);
const char *tp = msg + lmsg - (sizeof (LUA_QL ("<eof>")) - 1);
if (strstr (msg, LUA_QL ("<eof>")) == tp)
{
lua_pop (L, 1);
return 1;
}
}
return 0; /* else... */
}
static grub_err_t
interactive (void)
{
const char *ps1 = "lua> ";
const char *ps2 = "lua>> ";
const char *prompt = ps1;
char *line;
char *chunk = NULL;
size_t len;
size_t oldlen = 0;
int r;
grub_printf ("%s", N_ ("Welcome to lua, press the escape key to exit."));
while ((line = grub_cmdline_get (prompt)) != NULL)
{
/* len = lenght of chunk + line + newline character */
len = oldlen + grub_strlen (line) + 1;
chunk = grub_realloc (chunk, len + 1);
grub_strcpy (chunk + oldlen , line);
chunk[len - 1] = '\n';
chunk[len] = '\0';
grub_free (line);
r = luaL_loadbuffer (state, chunk, len, "stdin");
if (!r)
{
/* No error: Execute this chunk and prepare to read another */
r = lua_pcall (state, 0, 0, 0);
if (r)
{
handle_lua_error ("Lua");
grub_print_error ();
}
grub_free (chunk);
chunk = NULL;
len = 0;
prompt = ps1;
}
else if (incomplete (state, r))
{
/* Chunk is incomplete, try reading another line */
prompt = ps2;
}
else if (r == LUA_ERRSYNTAX)
{
handle_lua_error ("Lua");
grub_print_error ();
/* This chunk is garbage, try starting another one */
grub_free (chunk);
chunk = NULL;
len = 0;
prompt = ps1;
}
else
{
/* Handle errors other than syntax errors (out of memory, etc.) */
grub_free (chunk);
handle_lua_error ("Lua parser failed");
return grub_errno;
}
oldlen = len;
}
grub_free (chunk);
lua_gc (state, LUA_GCCOLLECT, 0);
return grub_errno;
}
static grub_err_t
grub_cmd_lua (grub_command_t cmd __attribute__ ((unused)),
int argc, char **args)
{
if (argc == 1)
{
if (luaL_loadfile (state, args[0]))
{
handle_lua_error ("Lua");
}
else if (lua_pcall (state, 0, 0, 0))
{
handle_lua_error ("Lua");
}
}
else if (argc == 0)
{
return interactive ();
}
else
{
return grub_error (GRUB_ERR_BAD_ARGUMENT, "1 or 0 arguments expected");
}
return grub_errno;
}
static grub_command_t cmd;
GRUB_MOD_INIT (lua)
{
(void) mod;
state = lua_open ();
if (state)
{
lua_gc (state, LUA_GCSTOP, 0);
luaL_openlibs (state);
luaL_register (state, "grub", grub_lua_lib);
lua_gc (state, LUA_GCRESTART, 0);
cmd = grub_register_command ("lua", grub_cmd_lua, N_("[FILE]"),
N_ ("Run lua script FILE or start interactive lua shell"));
}
}
GRUB_MOD_FINI (lua)
{
if (state)
{
lua_close (state);
grub_unregister_command (cmd);
}
}
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