mirror of
https://github.com/Fishwaldo/bl_mcu_sdk.git
synced 2025-07-08 05:48:28 +00:00
656 lines
No EOL
21 KiB
C
656 lines
No EOL
21 KiB
C
#include "log.h"
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#include "lprefix.h"
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#include <stdlib.h>
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#include <string.h>
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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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#ifdef CONFIG_LUA_LHAL
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#include "llib_init.h"
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#endif
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#ifdef DBG_TAG
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#undef DBG_TAG
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#endif
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#define DBG_TAG "LUA"
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static char lua_path_default[] = LUA_PATH_DEFAULT;
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#if !defined(LUA_SL_PROGNAME)
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#define LUA_SL_PROGNAME "lua"
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#endif
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#if !defined(LUA_INIT_VAR)
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#define LUA_INIT_VAR "LUA_INIT"
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#endif
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#define LUA_INITVARVERSION LUA_INIT_VAR LUA_VERSUFFIX
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static lua_State *sl_globalL = NULL;
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static const char *sl_progname = LUA_SL_PROGNAME;
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static void (*sl_signalfunc)(void) = NULL;
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static void sl_signal(void (*func)(void))
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{
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sl_signalfunc = func;
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}
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/*
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** Hook set by signal function to stop the interpreter.
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*/
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static void sl_stop(lua_State *L, lua_Debug *ar)
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{
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(void)ar; /* unused arg. */
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lua_sethook(L, NULL, 0, 0); /* reset hook */
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luaL_error(L, "interrupted!");
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}
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/*
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** Function to be called at a C signal. Because a C signal cannot
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** just change a Lua state (as there is no proper synchronization),
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** this function only sets a hook that, when called, will stop the
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** interpreter.
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*/
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static void sl_action(void)
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{
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int flag = LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE | LUA_MASKCOUNT;
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sl_signal(NULL); /* if another SIGINT happens, terminate process */
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lua_sethook(sl_globalL, sl_stop, flag, 1);
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}
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static void sl_print_usage(const char *badoption)
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{
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lua_writestringerror("%s: ", sl_progname);
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if (badoption[1] == 'e' || badoption[1] == 'l') {
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lua_writestringerror("'%s' needs argument\n", badoption);
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} else {
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lua_writestringerror("unrecognized option '%s'\n", badoption);
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}
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lua_writestringerror(
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"usage: %s [options] [script [args]]\n"
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"Available options are:\n"
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" -e stat execute string 'stat'\n"
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" -i enter interactive mode after executing 'script'\n"
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" -l mod require library 'mod' into global 'mod'\n"
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" -l g=mod require library 'mod' into global 'g'\n"
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" -v show version information\n"
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" -E ignore environment variables\n"
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" -W turn warnings on\n"
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" -- stop handling options\n"
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" - stop handling options and execute stdin\n",
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sl_progname);
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}
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/*
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** Prints an error message, adding the program name in front of it
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** (if present)
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*/
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static void sl_message(const char *pname, const char *msg)
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{
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if (pname) {
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lua_writestringerror("%s: ", pname);
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}
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lua_writestringerror("%s\n", msg);
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}
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/*
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** Check whether 'status' is not OK and, if so, prints the error
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** message on the top of the stack. It assumes that the error object
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** is a string, as it was either generated by Lua or by 'sl_msghandler'.
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*/
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static int sl_report(lua_State *L, int status)
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{
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if (status != LUA_OK) {
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const char *msg = lua_tostring(L, -1);
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sl_message(sl_progname, msg);
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lua_pop(L, 1); /* remove message */
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}
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return status;
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}
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/*
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** Message handler used to run all chunks
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*/
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static int sl_msghandler(lua_State *L)
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{
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const char *msg = lua_tostring(L, 1);
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if (msg == NULL) { /* is error object not a string? */
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if (luaL_callmeta(L, 1, "__tostring") && /* does it have a metamethod */
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lua_type(L, -1) == LUA_TSTRING) /* that produces a string? */
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return 1; /* that is the message */
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else
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msg = lua_pushfstring(L, "(error object is a %s value)",
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luaL_typename(L, 1));
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}
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luaL_traceback(L, L, msg, 1); /* append a standard traceback */
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return 1; /* return the traceback */
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}
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/*
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** Interface to 'lua_pcall', which sets appropriate message function
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** and C-signal handler. Used to run all chunks.
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*/
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static int sl_docall(lua_State *L, int narg, int nres)
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{
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int status;
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int base = lua_gettop(L) - narg; /* function index */
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lua_pushcfunction(L, sl_msghandler); /* push message handler */
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lua_insert(L, base); /* put it under function and args */
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sl_globalL = L; /* to be available to 'sl_action' */
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sl_signal(sl_action); /* set C-signal handler */
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status = lua_pcall(L, narg, nres, base);
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sl_signal(NULL); /* reset C-signal handler */
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lua_remove(L, base); /* remove message handler from the stack */
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return status;
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}
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static void sl_print_version(void)
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{
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char *token;
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LOG_I("%s\r\n", LUA_COPYRIGHT);
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LOG_I("LUA_ROOT %s\r\n", LUA_ROOT);
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LOG_I("LUA_LDIR %s\r\n", LUA_LDIR);
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LOG_I("LUA_CDIR %s\r\n", LUA_CDIR);
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LOG_I("LUA_PATH_DEFAULT\r\n");
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token = strtok(lua_path_default, ";");
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while (token != NULL) {
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LOG_I(" %s\r\n", token);
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token = strtok(NULL, ";");
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}
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LOG_I("\r\n");
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LOG_FLUSH();
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}
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/*
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** Create the 'arg' table, which stores all arguments from the
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** command line ('argv'). It should be aligned so that, at index 0,
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** it has 'argv[script]', which is the script name. The arguments
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** to the script (everything after 'script') go to positive indices;
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** other arguments (before the script name) go to negative indices.
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** If there is no script name, assume interpreter's name as base.
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*/
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static void sl_createargtable(lua_State *L, char **argv, int argc, int script)
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{
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int i, narg;
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if (script == argc)
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script = 0; /* no script name? */
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narg = argc - (script + 1); /* number of positive indices */
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lua_createtable(L, narg, script + 1);
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for (i = 0; i < argc; i++) {
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lua_pushstring(L, argv[i]);
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lua_rawseti(L, -2, i - script);
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}
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lua_setglobal(L, "arg");
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}
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static int sl_dochunk(lua_State *L, int status)
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{
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if (status == LUA_OK)
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status = sl_docall(L, 0, 0);
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return sl_report(L, status);
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}
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static int sl_dofile(lua_State *L, const char *name)
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{
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return sl_dochunk(L, luaL_loadfile(L, name));
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}
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static int sl_dostring(lua_State *L, const char *s, const char *name)
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{
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return sl_dochunk(L, luaL_loadbuffer(L, s, strlen(s), name));
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}
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/*
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** Receives 'globname[=modname]' and runs 'globname = require(modname)'.
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*/
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static int sl_dolibrary(lua_State *L, char *globname)
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{
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int status;
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char *modname = strchr(globname, '=');
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if (modname == NULL) /* no explicit name? */
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modname = globname; /* module name is equal to global name */
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else {
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*modname = '\0'; /* global name ends here */
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modname++; /* module name starts after the '=' */
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}
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lua_getglobal(L, "require");
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lua_pushstring(L, modname);
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status = sl_docall(L, 1, 1); /* call 'require(modname)' */
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if (status == LUA_OK)
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lua_setglobal(L, globname); /* globname = require(modname) */
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return sl_report(L, status);
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}
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/*
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** Push on the stack the contents of table 'arg' from 1 to #arg
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*/
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static int sl_pushargs(lua_State *L)
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{
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int i, n;
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if (lua_getglobal(L, "arg") != LUA_TTABLE)
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luaL_error(L, "'arg' is not a table");
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n = (int)luaL_len(L, -1);
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luaL_checkstack(L, n + 3, "too many arguments to script");
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for (i = 1; i <= n; i++)
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lua_rawgeti(L, -i, i);
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lua_remove(L, -i); /* remove table from the stack */
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return n;
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}
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static int sl_handle_script(lua_State *L, char **argv)
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{
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int status;
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const char *fname = argv[0];
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if (strcmp(fname, "-") == 0 && strcmp(argv[-1], "--") != 0)
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fname = NULL; /* stdin */
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status = luaL_loadfile(L, fname);
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if (status == LUA_OK) {
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int n = sl_pushargs(L); /* push arguments to script */
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status = sl_docall(L, n, LUA_MULTRET);
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}
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return sl_report(L, status);
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}
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/* bits of various argument indicators in 'args' */
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#define has_error 1 /* bad option */
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#define has_i 2 /* -i */
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#define has_v 4 /* -v */
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#define has_e 8 /* -e */
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#define has_E 16 /* -E */
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/*
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** Traverses all arguments from 'argv', returning a mask with those
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** needed before running any Lua code (or an error code if it finds
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** any invalid argument). 'first' returns the first not-handled argument
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** (either the script name or a bad argument in case of error).
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*/
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static int sl_collectargs(char **argv, int *first)
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{
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int args = 0;
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int i;
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for (i = 1; argv[i] != NULL; i++) {
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*first = i;
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if (argv[i][0] != '-') /* not an option? */
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return args; /* stop handling options */
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switch (argv[i][1]) { /* else check option */
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case '-': /* '--' */
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if (argv[i][2] != '\0') /* extra characters after '--'? */
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return has_error; /* invalid option */
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*first = i + 1;
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return args;
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case '\0': /* '-' */
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return args; /* script "name" is '-' */
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case 'E':
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if (argv[i][2] != '\0') /* extra characters? */
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return has_error; /* invalid option */
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args |= has_E;
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break;
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case 'W':
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if (argv[i][2] != '\0') /* extra characters? */
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return has_error; /* invalid option */
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break;
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case 'i':
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args |= has_i; /* (-i implies -v) */ /* FALLTHROUGH */
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case 'v':
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if (argv[i][2] != '\0') /* extra characters? */
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return has_error; /* invalid option */
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args |= has_v;
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break;
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case 'e':
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args |= has_e; /* FALLTHROUGH */
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case 'l': /* both options need an argument */
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if (argv[i][2] == '\0') { /* no concatenated argument? */
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i++; /* try next 'argv' */
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if (argv[i] == NULL || argv[i][0] == '-')
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return has_error; /* no next argument or it is another option */
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}
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break;
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default: /* invalid option */
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return has_error;
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}
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}
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*first = i; /* no script name */
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return args;
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}
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/*
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** Processes options 'e' and 'l', which involve running Lua code, and
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** 'W', which also affects the state.
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** Returns 0 if some code raises an error.
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*/
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static int sl_runargs(lua_State *L, char **argv, int n)
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{
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int i;
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for (i = 1; i < n; i++) {
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int option = argv[i][1];
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lua_assert(argv[i][0] == '-'); /* already checked */
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switch (option) {
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case 'e':
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case 'l': {
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int status;
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char *extra = argv[i] + 2; /* both options need an argument */
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if (*extra == '\0')
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extra = argv[++i];
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lua_assert(extra != NULL);
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status = (option == 'e') ? sl_dostring(L, extra, "=(command line)") : sl_dolibrary(L, extra);
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if (status != LUA_OK)
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return 0;
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break;
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}
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case 'W':
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lua_warning(L, "@on", 0); /* warnings on */
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break;
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}
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}
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return 1;
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}
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static int sl_handle_luainit(lua_State *L)
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{
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const char *name = "=" LUA_INITVARVERSION;
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const char *init = getenv(name + 1);
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if (init == NULL) {
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name = "=" LUA_INIT_VAR;
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init = getenv(name + 1); /* try alternative name */
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}
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if (init == NULL)
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return LUA_OK;
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else if (init[0] == '@')
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return sl_dofile(L, init + 1);
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else
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return sl_dostring(L, init, name);
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}
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/*
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** {==================================================================
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** Read-Eval-Print Loop (REPL)
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** ===================================================================
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*/
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#if !defined(LUA_PROMPT)
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#define LUA_PROMPT "> "
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#define LUA_PROMPT2 ">> "
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#endif
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#if !defined(LUA_MAXINPUT)
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#define LUA_MAXINPUT 512
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#endif
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/*
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** sl_lua_stdin_is_tty detects whether the standard input is a 'tty' (that
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** is, whether we're running lua interactively).
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*/
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#define sl_lua_stdin_is_tty() 0 /* assume stdin is a tty */
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/*
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** sl_lua_readline defines how to show a prompt and then read a line from
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** the standard input.
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** sl_lua_saveline defines how to "save" a read line in a "history".
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** sl_lua_freeline defines how to free a line read by sl_lua_readline.
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*/
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#define sl_lua_initreadline(L) ((void)L, (void)0)
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#define sl_lua_readline(L, b, p) ((void)L, (void)b, (void)p, 0)
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#define sl_lua_saveline(L, line) ((void)L, (void)line, (void)0)
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#define sl_lua_freeline(L, b) ((void)L, (void)b, (void)0)
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#ifndef sl_lua_initreadline
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#define sl_lua_initreadline(L) ((void)L, (void)0)
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#endif
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#ifndef sl_lua_readline
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#define sl_lua_readline(L, b, p) \
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((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \
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fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */
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#endif
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#ifndef sl_lua_saveline
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#define sl_lua_saveline(L, line) ((void)L, (void)line, (void)0)
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#endif
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#ifndef sl_lua_freeline
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#define sl_lua_freeline(L, b) ((void)L, (void)b, (void)0)
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#endif
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/*
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** Return the string to be used as a prompt by the interpreter. Leave
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** the string (or nil, if using the default value) on the stack, to keep
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** it anchored.
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*/
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static const char *sl_get_prompt(lua_State *L, int firstline)
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{
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if (lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2") == LUA_TNIL)
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return (firstline ? LUA_PROMPT : LUA_PROMPT2); /* use the default */
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else { /* apply 'tostring' over the value */
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const char *p = luaL_tolstring(L, -1, NULL);
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lua_remove(L, -2); /* remove original value */
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return p;
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}
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}
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/* mark in error messages for sl_incomplete statements */
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#define SL_EOFMARK "<eof>"
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#define sl_marklen (sizeof(SL_EOFMARK) / sizeof(char) - 1)
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/*
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** Check whether 'status' signals a syntax error and the error
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** message at the top of the stack ends with the above mark for
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** sl_incomplete statements.
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*/
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static int sl_incomplete(lua_State *L, int status)
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{
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if (status == LUA_ERRSYNTAX) {
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size_t lmsg;
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const char *msg = lua_tolstring(L, -1, &lmsg);
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if (lmsg >= sl_marklen && strcmp(msg + lmsg - sl_marklen, SL_EOFMARK) == 0) {
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lua_pop(L, 1);
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return 1;
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}
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}
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return 0; /* else... */
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}
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/*
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** Prompt the user, read a line, and push it into the Lua stack.
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*/
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static int sl_pushline(lua_State *L, int firstline)
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{
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char buffer[LUA_MAXINPUT];
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char *b = buffer;
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size_t l;
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const char *prmt = sl_get_prompt(L, firstline);
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int readstatus = sl_lua_readline(L, b, prmt);
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if (readstatus == 0)
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return 0; /* no input (prompt will be popped by caller) */
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lua_pop(L, 1); /* remove prompt */
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l = strlen(b);
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if (l > 0 && b[l - 1] == '\n') /* line ends with newline? */
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b[--l] = '\0'; /* remove it */
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if (firstline && b[0] == '=') /* for compatibility with 5.2, ... */
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lua_pushfstring(L, "return %s", b + 1); /* change '=' to 'return' */
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else
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lua_pushlstring(L, b, l);
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sl_lua_freeline(L, b);
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return 1;
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}
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/*
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** Try to compile line on the stack as 'return <line>;'; on return, stack
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** has either compiled chunk or original line (if compilation failed).
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*/
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static int sl_addreturn(lua_State *L)
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|
{
|
|
const char *line = lua_tostring(L, -1); /* original line */
|
|
const char *retline = lua_pushfstring(L, "return %s;", line);
|
|
int status = luaL_loadbuffer(L, retline, strlen(retline), "=stdin");
|
|
if (status == LUA_OK) {
|
|
lua_remove(L, -2); /* remove modified line */
|
|
if (line[0] != '\0') /* non empty? */
|
|
sl_lua_saveline(L, line); /* keep history */
|
|
} else
|
|
lua_pop(L, 2); /* pop result from 'luaL_loadbuffer' and modified line */
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
** Read multiple lines until a complete Lua statement
|
|
*/
|
|
static int sl_multiline(lua_State *L)
|
|
{
|
|
for (;;) { /* repeat until gets a complete statement */
|
|
size_t len;
|
|
const char *line = lua_tolstring(L, 1, &len); /* get what it has */
|
|
int status = luaL_loadbuffer(L, line, len, "=stdin"); /* try it */
|
|
if (!sl_incomplete(L, status) || !sl_pushline(L, 0)) {
|
|
sl_lua_saveline(L, line); /* keep history */
|
|
return status; /* cannot or should not try to add continuation line */
|
|
}
|
|
lua_pushliteral(L, "\n"); /* add newline... */
|
|
lua_insert(L, -2); /* ...between the two lines */
|
|
lua_concat(L, 3); /* join them */
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Read a line and try to load (compile) it first as an expression (by
|
|
** adding "return " in front of it) and second as a statement. Return
|
|
** the final status of load/call with the resulting function (if any)
|
|
** in the top of the stack.
|
|
*/
|
|
static int sl_loadline(lua_State *L)
|
|
{
|
|
int status;
|
|
lua_settop(L, 0);
|
|
if (!sl_pushline(L, 1))
|
|
return -1; /* no input */
|
|
if ((status = sl_addreturn(L)) != LUA_OK) /* 'return ...' did not work? */
|
|
status = sl_multiline(L); /* try as command, maybe with continuation lines */
|
|
lua_remove(L, 1); /* remove line from the stack */
|
|
lua_assert(lua_gettop(L) == 1);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
** Prints (calling the Lua 'print' function) any values on the stack
|
|
*/
|
|
static void sl_print(lua_State *L)
|
|
{
|
|
int n = lua_gettop(L);
|
|
if (n > 0) { /* any result to be printed? */
|
|
luaL_checkstack(L, LUA_MINSTACK, "too many results to print");
|
|
lua_getglobal(L, "print");
|
|
lua_insert(L, 1);
|
|
if (lua_pcall(L, n, 0, 0) != LUA_OK)
|
|
sl_message(sl_progname, lua_pushfstring(L, "error calling 'print' (%s)",
|
|
lua_tostring(L, -1)));
|
|
}
|
|
}
|
|
|
|
/*
|
|
** Do the REPL: repeatedly read (load) a line, evaluate (call) it, and
|
|
** print any results.
|
|
*/
|
|
static void sl_doREPL(lua_State *L)
|
|
{
|
|
int status;
|
|
const char *oldsl_progname = sl_progname;
|
|
sl_progname = NULL; /* no 'sl_progname' on errors in interactive mode */
|
|
sl_lua_initreadline(L);
|
|
while ((status = sl_loadline(L)) != -1) {
|
|
if (status == LUA_OK)
|
|
status = sl_docall(L, 0, LUA_MULTRET);
|
|
if (status == LUA_OK)
|
|
sl_print(L);
|
|
else
|
|
sl_report(L, status);
|
|
}
|
|
lua_settop(L, 0); /* clear stack */
|
|
lua_writeline();
|
|
sl_progname = oldsl_progname;
|
|
}
|
|
|
|
/* }================================================================== */
|
|
|
|
/*
|
|
** Main body of stand-alone interpreter (to be called in protected mode).
|
|
** Reads the options and handles them all.
|
|
*/
|
|
static int sl_main(lua_State *L)
|
|
{
|
|
int argc = (int)lua_tointeger(L, 1);
|
|
char **argv = (char **)lua_touserdata(L, 2);
|
|
int script;
|
|
int args = sl_collectargs(argv, &script);
|
|
luaL_checkversion(L); /* check that interpreter has correct version */
|
|
if (argv[0] && argv[0][0])
|
|
sl_progname = argv[0];
|
|
if (args == has_error) { /* bad arg? */
|
|
sl_print_usage(argv[script]); /* 'script' has index of bad arg. */
|
|
return 0;
|
|
}
|
|
if (args & has_v) /* option '-v'? */
|
|
sl_print_version();
|
|
if (args & has_E) { /* option '-E'? */
|
|
lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */
|
|
lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
|
|
}
|
|
luaL_openlibs(L); /* open standard libraries */
|
|
#ifdef CONFIG_LUA_LHAL
|
|
luaL_preload_llibs(L);
|
|
#endif
|
|
sl_createargtable(L, argv, argc, script); /* create table 'arg' */
|
|
lua_gc(L, LUA_GCGEN, 0, 0); /* GC in generational mode */
|
|
if (!(args & has_E)) { /* no option '-E'? */
|
|
if (sl_handle_luainit(L) != LUA_OK) /* run LUA_INIT */
|
|
return 0; /* error running LUA_INIT */
|
|
}
|
|
if (!sl_runargs(L, argv, script)) /* execute arguments -e and -l */
|
|
return 0; /* something failed */
|
|
if (script < argc && /* execute main script (if there is one) */
|
|
sl_handle_script(L, argv + script) != LUA_OK)
|
|
return 0;
|
|
if (args & has_i) /* -i option? */
|
|
sl_doREPL(L); /* do read-eval-print loop */
|
|
else if (script == argc && !(args & (has_e | has_v))) { /* no arguments? */
|
|
if (sl_lua_stdin_is_tty()) { /* running in interactive mode? */
|
|
sl_doREPL(L); /* do read-eval-print loop */
|
|
} else
|
|
sl_dofile(L, NULL); /* executes stdin as a file */
|
|
}
|
|
lua_pushboolean(L, 1); /* signal no errors */
|
|
return 1;
|
|
}
|
|
|
|
int lua_start(int argc, char **argv)
|
|
{
|
|
sl_print_version();
|
|
int status, result;
|
|
lua_State *L = luaL_newstate(); /* create state */
|
|
if (L == NULL) {
|
|
sl_message(argv[0], "cannot create state: not enough memory");
|
|
return EXIT_FAILURE;
|
|
}
|
|
lua_pushcfunction(L, &sl_main); /* to call 'sl_main' in protected mode */
|
|
lua_pushinteger(L, argc); /* 1st argument */
|
|
lua_pushlightuserdata(L, argv); /* 2nd argument */
|
|
status = lua_pcall(L, 2, 1, 0); /* do the call */
|
|
result = lua_toboolean(L, -1); /* get result */
|
|
sl_report(L, status);
|
|
lua_close(L);
|
|
return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
|
|
}
|
|
|
|
void lua_end(void)
|
|
{
|
|
if (sl_signalfunc) {
|
|
sl_signalfunc();
|
|
}
|
|
} |