mirror of https://github.com/lua/lua
435 lines
9.6 KiB
C
435 lines
9.6 KiB
C
/*
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** $Id: lua.c,v 1.122 2003/04/03 13:34:42 roberto Exp roberto $
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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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/*
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** generic extra include file
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*/
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#ifdef LUA_USERCONFIG
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#include LUA_USERCONFIG
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#endif
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/*
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** definition of `isatty'
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*/
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#ifdef _POSIX_C_SOURCE
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#include <unistd.h>
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#define stdin_is_tty() isatty(0)
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#else
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#define stdin_is_tty() 1 /* assume stdin is a tty */
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#endif
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#ifndef PROMPT
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#define PROMPT "> "
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#endif
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#ifndef PROMPT2
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#define PROMPT2 ">> "
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#endif
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#ifndef PROGNAME
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#define PROGNAME "lua"
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#endif
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#ifndef lua_userinit
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#define lua_userinit(L) openstdlibs(L)
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#endif
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#ifndef LUA_EXTRALIBS
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#define LUA_EXTRALIBS /* empty */
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#endif
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static lua_State *L = NULL;
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static const char *progname = PROGNAME;
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static const luaL_reg lualibs[] = {
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{"base", luaopen_base},
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{"table", luaopen_table},
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{"io", luaopen_io},
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{"string", luaopen_string},
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{"math", luaopen_math},
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{"debug", luaopen_debug},
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{"loadlib", luaopen_loadlib},
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/* add your libraries here */
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LUA_EXTRALIBS
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{NULL, NULL}
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};
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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(L, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
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}
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static void print_usage (void) {
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fprintf(stderr,
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"usage: %s [options] [script [args]].\n"
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"Available options are:\n"
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" - execute stdin as a file\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 name load and run library `name'\n"
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" -v show version information\n"
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" -- stop handling options\n" ,
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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) fprintf(stderr, "%s: ", pname);
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fprintf(stderr, "%s\n", msg);
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}
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static int report (int status) {
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const char *msg;
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if (status) {
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msg = lua_tostring(L, -1);
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if (msg == NULL) msg = "(error with no message)";
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l_message(progname, msg);
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lua_pop(L, 1);
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}
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return status;
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}
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static int lcall (int narg, int clear) {
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int status;
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int base = lua_gettop(L) - narg; /* function index */
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lua_pushliteral(L, "_TRACEBACK");
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lua_rawget(L, LUA_GLOBALSINDEX); /* get traceback function */
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lua_insert(L, base); /* put it under chunk and args */
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signal(SIGINT, laction);
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status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), 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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l_message(NULL, LUA_VERSION " " LUA_COPYRIGHT);
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}
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static void getargs (char *argv[], int n) {
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int i;
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lua_newtable(L);
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for (i=0; argv[i]; i++) {
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lua_pushnumber(L, i - n);
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lua_pushstring(L, argv[i]);
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lua_rawset(L, -3);
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}
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}
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static int docall (int status) {
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if (status == 0) status = lcall(0, 1);
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return report(status);
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}
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static int file_input (const char *name) {
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return docall(luaL_loadfile(L, name));
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}
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static int dostring (const char *s, const char *name) {
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return docall(luaL_loadbuffer(L, s, strlen(s), name));
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}
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static int load_file (const char *name) {
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lua_pushliteral(L, "require");
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lua_rawget(L, LUA_GLOBALSINDEX);
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if (!lua_isfunction(L, -1)) { /* no `require' defined? */
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lua_pop(L, 1);
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return file_input(name);
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}
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else {
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lua_pushstring(L, name);
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return report(lcall(1, 1));
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}
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}
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/*
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** this macro can be used by some `history' system to save lines
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** read in manual input
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*/
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#ifndef lua_saveline
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#define lua_saveline(L,line) /* empty */
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#endif
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/*
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** this macro defines a function to show the prompt and reads the
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** next line for manual input
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*/
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#ifndef lua_readline
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#define lua_readline(L,prompt) readline(L,prompt)
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/* maximum length of an input line */
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#ifndef MAXINPUT
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#define MAXINPUT 512
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#endif
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static int readline (lua_State *l, const char *prompt) {
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static char buffer[MAXINPUT];
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if (prompt) {
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fputs(prompt, stdout);
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fflush(stdout);
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}
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if (fgets(buffer, sizeof(buffer), stdin) == NULL)
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return 0; /* read fails */
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else {
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lua_pushstring(l, buffer);
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return 1;
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}
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}
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#endif
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static const char *get_prompt (int firstline) {
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const char *p = NULL;
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lua_pushstring(L, firstline ? "_PROMPT" : "_PROMPT2");
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lua_rawget(L, LUA_GLOBALSINDEX);
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p = lua_tostring(L, -1);
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if (p == NULL) p = (firstline ? PROMPT : 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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static int incomplete (int status) {
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if (status == LUA_ERRSYNTAX &&
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strstr(lua_tostring(L, -1), "near `<eof>'") != NULL) {
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lua_pop(L, 1);
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return 1;
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}
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else
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return 0;
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}
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static int load_string (void) {
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int status;
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lua_settop(L, 0);
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if (lua_readline(L, get_prompt(1)) == 0) /* no input? */
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return -1;
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if (lua_tostring(L, -1)[0] == '=') { /* line starts with `=' ? */
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lua_pushfstring(L, "return %s", lua_tostring(L, -1)+1);/* `=' -> `return' */
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lua_remove(L, -2); /* remove original line */
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}
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for (;;) { /* repeat until gets a complete line */
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status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=stdin");
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if (!incomplete(status)) break; /* cannot try to add lines? */
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if (lua_readline(L, get_prompt(0)) == 0) /* no more input? */
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return -1;
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lua_concat(L, lua_gettop(L)); /* join lines */
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}
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lua_saveline(L, lua_tostring(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 manual_input (void) {
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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 = load_string()) != -1) {
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if (status == 0) status = lcall(0, 0);
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report(status);
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if (status == 0 && lua_gettop(L) > 0) { /* any result 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) != 0)
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l_message(progname, lua_pushfstring(L, "error calling `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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fputs("\n", stdout);
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progname = oldprogname;
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}
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static int handle_argv (char *argv[], int *interactive) {
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if (argv[1] == NULL) { /* no more arguments? */
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if (stdin_is_tty()) {
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print_version();
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manual_input();
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}
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else
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file_input(NULL); /* executes stdin as a file */
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}
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else { /* other arguments; loop over them */
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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] != '-') break; /* not an option? */
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switch (argv[i][1]) { /* option */
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case '-': { /* `--' */
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if (argv[i][2] != '\0') {
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print_usage();
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return 1;
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}
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i++; /* skip this argument */
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goto endloop; /* stop handling arguments */
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}
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case '\0': {
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file_input(NULL); /* executes stdin as a file */
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break;
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}
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case 'i': {
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*interactive = 1;
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break;
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}
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case 'v': {
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print_version();
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break;
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}
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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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if (chunk == NULL) {
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print_usage();
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return 1;
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}
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if (dostring(chunk, "=<command line>") != 0)
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return 1;
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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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if (filename == NULL) {
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print_usage();
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return 1;
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}
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if (load_file(filename))
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return 1; /* stop if file fails */
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break;
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}
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case 'c': {
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l_message(progname, "option `-c' is deprecated");
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break;
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}
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case 's': {
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l_message(progname, "option `-s' is deprecated");
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break;
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}
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default: {
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print_usage();
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return 1;
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}
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}
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} endloop:
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if (argv[i] != NULL) {
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const char *filename = argv[i];
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getargs(argv, i); /* collect arguments */
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lua_setglobal(L, "arg");
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return file_input(filename); /* stop scanning arguments */
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}
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}
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return 0;
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}
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static void openstdlibs (lua_State *l) {
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const luaL_reg *lib = lualibs;
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for (; lib->func; lib++) {
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lib->func(l); /* open library */
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lua_settop(l, 0); /* discard any results */
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}
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}
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static int handle_luainit (void) {
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const char *init = getenv("LUA_INIT");
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if (init == NULL) return 0; /* status OK */
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else if (init[0] == '@')
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return file_input(init+1);
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else
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return dostring(init, "=LUA_INIT");
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}
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struct Smain {
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int argc;
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char **argv;
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int status;
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};
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static int pmain (lua_State *l) {
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struct Smain *s = (struct Smain *)lua_touserdata(l, 1);
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int status;
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int interactive = 0;
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if (s->argv[0] && s->argv[0][0]) progname = s->argv[0];
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L = l;
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lua_userinit(l); /* open libraries */
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status = handle_luainit();
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if (status == 0) {
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status = handle_argv(s->argv, &interactive);
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if (status == 0 && interactive) manual_input();
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}
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s->status = status;
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return 0;
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}
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int main (int argc, char *argv[]) {
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int status;
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struct Smain s;
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lua_State *l = lua_open(); /* 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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s.argc = argc;
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s.argv = argv;
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status = lua_cpcall(l, &pmain, &s);
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report(status);
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lua_close(l);
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return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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