121 lines
2.6 KiB
C
121 lines
2.6 KiB
C
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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#include "grub_lib.h"
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#include <grub/dl.h>
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#include <grub/parser.h>
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static lua_State *state;
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static grub_err_t
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grub_lua_parse_line (char *line, grub_reader_getline_t getline)
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{
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int r;
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char *old_line = 0;
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lua_settop(state, 0);
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while (1)
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{
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r = luaL_loadbuffer (state, line, grub_strlen (line), "grub");
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if (! r)
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{
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r = lua_pcall (state, 0, 0, 0);
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if (r)
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grub_error (GRUB_ERR_BAD_ARGUMENT, "lua command fails");
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else
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{
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grub_free (old_line);
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return grub_errno;
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}
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break;
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}
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if (r == LUA_ERRSYNTAX)
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{
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int lmsg;
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const char *msg = lua_tolstring(state, -1, &lmsg);
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const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
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if (grub_strstr(msg, LUA_QL("<eof>")) == tp)
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{
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char *n, *t;
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int len;
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lua_pop(state, 1);
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if ((getline (&n, 1)) || (! n))
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "incomplete command");
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break;
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}
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len = grub_strlen (line);
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t = grub_malloc (len + grub_strlen (n) + 2);
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if (! t)
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break;
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grub_strcpy (t, line);
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t[len] = '\n';
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grub_strcpy (t + len + 1, n);
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grub_free (old_line);
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line = old_line = t;
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continue;
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}
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}
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break;
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}
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grub_free (old_line);
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lua_gc (state, LUA_GCCOLLECT, 0);
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return grub_errno;
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}
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static struct grub_parser grub_lua_parser =
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{
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.name = "lua",
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.parse_line = grub_lua_parse_line
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};
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GRUB_MOD_INIT(lua)
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{
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(void) mod;
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state = lua_open ();
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if (state)
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{
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lua_gc(state, LUA_GCSTOP, 0);
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luaL_openlibs(state);
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luaL_register(state, "grub", grub_lua_lib);
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lua_gc(state, LUA_GCRESTART, 0);
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grub_parser_register ("lua", &grub_lua_parser);
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}
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}
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GRUB_MOD_FINI(lua)
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{
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if (state)
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{
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grub_parser_unregister (&grub_lua_parser);
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lua_close(state);
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}
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}
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