mirror of https://github.com/lua/lua
376 lines
8.6 KiB
C
376 lines
8.6 KiB
C
/*
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** $Id: lua.c,v 1.96 2002/07/10 20:44:34 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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#include "lua.h"
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#include "lauxlib.h"
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#include "luadebug.h"
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#include "lualib.h"
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#ifdef _POSIX_SOURCE
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#include <unistd.h>
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#else
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static int isatty (int x) { return x==0; } /* 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 LUA_USERINIT
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#define LUA_USERINIT(L) openstdlibs(L)
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#endif
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static lua_State *L = NULL;
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static const char *progname;
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static lua_Hook old_hook = NULL;
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static int old_mask = 0;
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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, old_hook, old_mask);
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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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old_hook = lua_gethook(L);
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old_mask = lua_gethookmask(L);
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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] [prog [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 `prog'\n"
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" -l name execute file `name'\n"
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" -v print 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", msg);
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}
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static void report (int status, int traceback) {
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const char *msg;
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if (status) {
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if (status == LUA_ERRRUN) {
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if (!traceback) lua_pop(L, 1); /* remove traceback */
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else {
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if (lua_isstring(L, -2) && lua_isstring(L, -1))
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lua_concat(L, 2); /* concat error message and traceback */
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else
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lua_remove(L, -2); /* leave only traceback on stack */
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}
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}
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msg = lua_tostring(L, -1);
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if (msg == NULL) msg = "(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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}
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static int lcall (int clear) {
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int status;
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int top = lua_gettop(L);
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signal(SIGINT, laction);
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status = lua_pcall(L, 0, LUA_MULTRET);
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signal(SIGINT, SIG_DFL);
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if (status == 0 && clear)
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lua_settop(L, top); /* remove eventual results */
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return status;
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}
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static int l_panic (lua_State *l) {
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(void)l;
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l_message(progname, "unable to recover; exiting\n");
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return 0;
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}
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static void print_version (void) {
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l_message(NULL, LUA_VERSION " " LUA_COPYRIGHT "\n");
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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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/* arg.n = maximum index in table `arg' */
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lua_pushliteral(L, "n");
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lua_pushnumber(L, i-n-1);
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lua_rawset(L, -3);
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}
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static int docall (int status) {
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if (status == 0) status = lcall(1);
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report(status, 1);
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return 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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#ifndef save_line
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#define save_line(b) /* empty */
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#endif
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#ifndef read_line
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#define read_line(p) readline(p)
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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 (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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size_t l = strlen(buffer);
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if (l > 0 && buffer[l-1] == '\n')
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buffer[l-1] = '\0'; /* remove eventual `\n' */
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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_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
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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 (read_line(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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lua_pushliteral(L, "\n"); /* no; add line separator */
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if (read_line(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 and line separator */
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}
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save_line(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);
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report(status, 0);
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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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lua_pcall(L, lua_gettop(L)-1, 0);
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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 (isatty(0)) {
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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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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 EXIT_FAILURE;
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}
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if (dostring(chunk, "=<command line>") != 0)
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return EXIT_FAILURE;
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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 EXIT_FAILURE;
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}
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if (file_input(filename))
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return EXIT_FAILURE; /* 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\n");
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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\n");
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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 EXIT_FAILURE;
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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 remaining 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 EXIT_SUCCESS;
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}
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static int openstdlibs (lua_State *l) {
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return lua_baselibopen(l) +
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lua_tablibopen(l) +
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lua_iolibopen(l) +
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lua_strlibopen(l) +
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lua_mathlibopen(l) +
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lua_dblibopen(l) +
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/* add your libraries here */
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0;
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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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int main (int argc, char *argv[]) {
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int status;
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int interactive = 0;
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(void)argc; /* to avoid warnings */
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progname = argv[0];
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L = lua_open(); /* create state */
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lua_atpanic(L, l_panic);
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lua_pop(L, LUA_USERINIT(L)); /* open libraries, discard any results */
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status = handle_luainit();
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if (status != 0) return status;
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status = handle_argv(argv, &interactive);
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if (status == 0 && interactive) manual_input();
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lua_close(L);
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return status;
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}
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