forked from KolibriOS/kolibrios
502 lines
14 KiB
C
502 lines
14 KiB
C
/*
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** $Id: lua.c,v 1.203 2011/12/12 16:34:03 roberto Exp $
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** Lua stand-alone interpreter
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** See Copyright Notice in lua.h
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*/
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define lua_c
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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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#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_PROGNAME)
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#define LUA_PROGNAME "lua"
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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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#if !defined(LUA_INIT)
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#define LUA_INIT "LUA_INIT"
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#endif
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#define LUA_INITVERSION \
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LUA_INIT "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
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/*
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** 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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#if defined(LUA_USE_ISATTY)
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#include <unistd.h>
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#define lua_stdin_is_tty() isatty(0)
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#elif defined(LUA_WIN)
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#include <io.h>
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#include <stdio.h>
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#define lua_stdin_is_tty() _isatty(_fileno(stdin))
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#else
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#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
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#endif
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/*
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** 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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** lua_saveline defines how to "save" a read line in a "history".
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** lua_freeline defines how to free a line read by lua_readline.
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*/
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#if defined(LUA_USE_READLINE)
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#include <stdio.h>
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#include <readline/readline.h>
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#include <readline/history.h>
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#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
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#define lua_saveline(L,idx) \
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if (lua_rawlen(L,idx) > 0) /* non-empty line? */ \
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add_history(lua_tostring(L, idx)); /* add it to history */
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#define lua_freeline(L,b) ((void)L, free(b))
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#elif !defined(lua_readline)
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#define 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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#define lua_saveline(L,idx) { (void)L; (void)idx; }
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#define lua_freeline(L,b) { (void)L; (void)b; }
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#endif
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static lua_State *globalL = NULL;
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static const char *progname = LUA_PROGNAME;
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static void lstop (lua_State *L, lua_Debug *ar) {
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(void)ar; /* unused arg. */
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lua_sethook(L, NULL, 0, 0);
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luaL_error(L, "interrupted!");
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}
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static void laction (int i) {
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//signal(i, SIG_DFL); if another SIGINT happens before lstop,
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// terminate process (default action)
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lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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}
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static void print_usage (const char *badoption) {
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luai_writestringerror("%s: ", progname);
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if (badoption[1] == 'e' || badoption[1] == 'l')
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luai_writestringerror("'%s' needs argument\n", badoption);
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else
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luai_writestringerror("unrecognized option '%s'\n", badoption);
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luai_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 " LUA_QL("stat") "\n"
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" -i enter interactive mode after executing " LUA_QL("script") "\n"
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" -l name require library " LUA_QL("name") "\n"
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" -v show version information\n"
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" -E ignore environment variables\n"
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" -- stop handling options\n"
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" - stop handling options and execute stdin\n"
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,
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progname);
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}
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static void l_message (const char *pname, const char *msg) {
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if (pname) luai_writestringerror("%s: ", pname);
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luai_writestringerror("%s\n", msg);
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}
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static int report (lua_State *L, int status) {
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if (status != LUA_OK && !lua_isnil(L, -1)) {
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const char *msg = lua_tostring(L, -1);
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if (msg == NULL) msg = "(error object is not a string)";
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l_message(progname, msg);
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lua_pop(L, 1);
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/* force a complete garbage collection in case of errors */
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lua_gc(L, LUA_GCCOLLECT, 0);
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}
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return status;
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}
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/* the next function is called unprotected, so it must avoid errors */
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static void finalreport (lua_State *L, int status) {
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if (status != LUA_OK) {
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const char *msg = (lua_type(L, -1) == LUA_TSTRING) ? lua_tostring(L, -1)
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: NULL;
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if (msg == NULL) msg = "(error object is not a string)";
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l_message(progname, msg);
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lua_pop(L, 1);
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}
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}
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static int traceback (lua_State *L) {
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const char *msg = lua_tostring(L, 1);
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if (msg)
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luaL_traceback(L, L, msg, 1);
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else if (!lua_isnoneornil(L, 1)) { /* is there an error object? */
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if (!luaL_callmeta(L, 1, "__tostring")) /* try its 'tostring' metamethod */
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lua_pushliteral(L, "(no error message)");
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}
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return 1;
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}
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static int docall (lua_State *L, int narg, int nres) {
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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, traceback); /* push traceback function */
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lua_insert(L, base); /* put it under chunk and args */
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globalL = L; /* to be available to 'laction' */
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//signal(SIGINT, laction);
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status = lua_pcall(L, narg, nres, base);
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// signal(SIGINT, SIG_DFL);
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lua_remove(L, base); /* remove traceback function */
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return status;
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}
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static void print_version (void) {
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luai_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
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luai_writeline();
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}
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static int getargs (lua_State *L, char **argv, int n) {
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int narg;
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int i;
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int argc = 0;
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while (argv[argc]) argc++; /* count total number of arguments */
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narg = argc - (n + 1); /* number of arguments to the script */
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luaL_checkstack(L, narg + 3, "too many arguments to script");
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for (i=n+1; i < argc; i++)
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lua_pushstring(L, argv[i]);
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lua_createtable(L, narg, n + 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 - n);
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}
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return narg;
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}
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static int dofile (lua_State *L, const char *name) {
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int status = luaL_loadfile(L, name);
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if (status == LUA_OK) status = docall(L, 0, 0);
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return report(L, status);
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}
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static int dostring (lua_State *L, const char *s, const char *name) {
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int status = luaL_loadbuffer(L, s, strlen(s), name);
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if (status == LUA_OK) status = docall(L, 0, 0);
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return report(L, status);
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}
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static int dolibrary (lua_State *L, const char *name) {
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int status;
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lua_pushglobaltable(L);
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lua_getfield(L, -1, "require");
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lua_pushstring(L, name);
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status = docall(L, 1, 1);
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if (status == LUA_OK) {
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lua_setfield(L, -2, name); /* global[name] = require return */
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lua_pop(L, 1); /* remove global table */
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}
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else
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lua_remove(L, -2); /* remove global table (below error msg.) */
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return report(L, status);
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}
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static const char *get_prompt (lua_State *L, int firstline) {
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const char *p;
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lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
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p = lua_tostring(L, -1);
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if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
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lua_pop(L, 1); /* remove global */
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return p;
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}
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/* mark in error messages for incomplete statements */
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#define EOFMARK "<eof>"
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#define marklen (sizeof(EOFMARK)/sizeof(char) - 1)
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static int incomplete (lua_State *L, int status) {
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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 >= marklen && strcmp(msg + lmsg - marklen, 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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static int pushline (lua_State *L, int firstline) {
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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 = get_prompt(L, firstline);
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if (lua_readline(L, b, prmt) == 0)
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return 0; /* no input */
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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-1] = '\0'; /* remove it */
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if (firstline && b[0] == '=') /* first line starts with `=' ? */
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lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
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else
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lua_pushstring(L, b);
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lua_freeline(L, b);
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return 1;
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}
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static int loadline (lua_State *L) {
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int status;
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lua_settop(L, 0);
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if (!pushline(L, 1))
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return -1; /* no input */
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for (;;) { /* repeat until gets a complete line */
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size_t l;
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const char *line = lua_tolstring(L, 1, &l);
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status = luaL_loadbuffer(L, line, l, "=stdin");
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if (!incomplete(L, status)) break; /* cannot try to add lines? */
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if (!pushline(L, 0)) /* no more input? */
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return -1;
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lua_pushliteral(L, "\n"); /* add a new line... */
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lua_insert(L, -2); /* ...between the two lines */
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lua_concat(L, 3); /* join them */
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}
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lua_saveline(L, 1);
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lua_remove(L, 1); /* remove line */
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return status;
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}
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static void dotty (lua_State *L) {
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int status;
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const char *oldprogname = progname;
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progname = NULL;
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while ((status = loadline(L)) != -1) {
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if (status == LUA_OK) status = docall(L, 0, LUA_MULTRET);
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report(L, status);
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if (status == LUA_OK && lua_gettop(L) > 0) { /* any result to print? */
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luaL_checkstack(L, LUA_MINSTACK, "too many results to print");
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lua_getglobal(L, "print");
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lua_insert(L, 1);
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if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != LUA_OK)
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l_message(progname, lua_pushfstring(L,
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"error calling " LUA_QL("print") " (%s)",
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lua_tostring(L, -1)));
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}
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}
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lua_settop(L, 0); /* clear stack */
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luai_writeline();
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progname = oldprogname;
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}
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static int handle_script (lua_State *L, char **argv, int n) {
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int status;
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const char *fname;
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int narg = getargs(L, argv, n); /* collect arguments */
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lua_setglobal(L, "arg");
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fname = argv[n];
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if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
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fname = NULL; /* stdin */
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status = luaL_loadfile(L, fname);
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lua_insert(L, -(narg+1));
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if (status == LUA_OK)
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status = docall(L, narg, LUA_MULTRET);
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else
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lua_pop(L, narg);
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return report(L, status);
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}
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/* check that argument has no extra characters at the end */
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#define noextrachars(x) {if ((x)[2] != '\0') return -1;}
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/* indices of various argument indicators in array args */
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#define has_i 0 /* -i */
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#define has_v 1 /* -v */
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#define has_e 2 /* -e */
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#define has_E 3 /* -E */
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#define num_has 4 /* number of 'has_*' */
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static int collectargs (char **argv, int *args) {
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int i;
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for (i = 1; argv[i] != NULL; i++) {
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if (argv[i][0] != '-') /* not an option? */
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return i;
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switch (argv[i][1]) { /* option */
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case '-':
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noextrachars(argv[i]);
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return (argv[i+1] != NULL ? i+1 : 0);
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case '\0':
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return i;
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case 'E':
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args[has_E] = 1;
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break;
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case 'i':
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noextrachars(argv[i]);
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args[has_i] = 1; /* go through */
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case 'v':
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noextrachars(argv[i]);
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args[has_v] = 1;
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break;
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case 'e':
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args[has_e] = 1; /* go through */
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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 -(i - 1); /* no next argument or it is another option */
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}
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break;
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default: /* invalid option; return its index... */
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return -i; /* ...as a negative value */
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}
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}
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return 0;
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}
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static int runargs (lua_State *L, char **argv, int n) {
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int i;
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for (i = 1; i < n; i++) {
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lua_assert(argv[i][0] == '-');
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switch (argv[i][1]) { /* option */
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case 'e': {
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const char *chunk = argv[i] + 2;
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if (*chunk == '\0') chunk = argv[++i];
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lua_assert(chunk != NULL);
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if (dostring(L, chunk, "=(command line)") != LUA_OK)
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return 0;
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break;
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}
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case 'l': {
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const char *filename = argv[i] + 2;
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if (*filename == '\0') filename = argv[++i];
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lua_assert(filename != NULL);
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if (dolibrary(L, filename) != LUA_OK)
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return 0; /* stop if file fails */
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break;
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}
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default: 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 handle_luainit (lua_State *L) {
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const char *name = "=" LUA_INITVERSION;
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const char *init = getenv(name + 1);
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if (init == NULL) {
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name = "=" LUA_INIT;
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init = getenv(name + 1); /* try alternative name */
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}
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if (init == NULL) return LUA_OK;
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else if (init[0] == '@')
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return dofile(L, init+1);
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else
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return dostring(L, init, name);
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}
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static int pmain (lua_State *L) {
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int argc = (int)lua_tointeger(L, 1);
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char **argv = (char **)lua_touserdata(L, 2);
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int script;
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int args[num_has];
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args[has_i] = args[has_v] = args[has_e] = args[has_E] = 0;
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if (argv[0] && argv[0][0]) progname = argv[0];
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script = collectargs(argv, args);
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if (script < 0) { /* invalid arg? */
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print_usage(argv[-script]);
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return 0;
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}
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if (args[has_v]) print_version();
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if (args[has_E]) { /* option '-E'? */
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lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */
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lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
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}
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/* open standard libraries */
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luaL_checkversion(L);
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lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
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luaL_openlibs(L); /* open libraries */
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lua_gc(L, LUA_GCRESTART, 0);
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if (!args[has_E] && handle_luainit(L) != LUA_OK)
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return 0; /* error running LUA_INIT */
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/* execute arguments -e and -l */
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if (!runargs(L, argv, (script > 0) ? script : argc)) return 0;
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/* execute main script (if there is one) */
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if (script && handle_script(L, argv, script) != LUA_OK) return 0;
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if (args[has_i]) /* -i option? */
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dotty(L);
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else if (script == 0 && !args[has_e] && !args[has_v]) { /* no arguments? */
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if (lua_stdin_is_tty()) {
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print_version();
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dotty(L);
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}
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else dofile(L, NULL); /* executes stdin as a file */
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}
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lua_pushboolean(L, 1); /* signal no errors */
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return 1;
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}
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int main (int argc, char **argv) {
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int status, result;
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lua_State *L = luaL_newstate(); /* create state */
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if (L == NULL) {
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l_message(argv[0], "cannot create state: not enough memory");
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return EXIT_FAILURE;
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}
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/* call 'pmain' in protected mode */
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lua_pushcfunction(L, &pmain);
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lua_pushinteger(L, argc); /* 1st argument */
|
|
lua_pushlightuserdata(L, argv); /* 2nd argument */
|
|
status = lua_pcall(L, 2, 1, 0);
|
|
result = lua_toboolean(L, -1); /* get result */
|
|
finalreport(L, status);
|
|
lua_close(L);
|
|
return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
|
|
}
|
|
|