mirror of
https://github.com/lua/lua.git
synced 2024-11-24 10:43:44 +08:00
348 lines
8.3 KiB
C
348 lines
8.3 KiB
C
/*
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** $Id: lua.c,v 1.69 2001/08/30 20:54:02 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_PRIVATE
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#include "lua.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 LUA_PROGNAME
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#define LUA_PROGNAME l_s("lua: ")
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#endif
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#ifndef PROMPT
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#define PROMPT l_s("> ")
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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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typedef void (*handler)(int); /* type for signal actions */
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static void laction (int i);
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static lua_Hook old_linehook = NULL;
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static lua_Hook old_callhook = NULL;
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static handler lreset (void) {
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return signal(SIGINT, laction);
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}
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static void lstop (void) {
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lua_setlinehook(L, old_linehook);
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lua_setcallhook(L, old_callhook);
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lreset();
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lua_error(L, l_s("interrupted!"));
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}
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static void laction (int i) {
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(void)i; /* to avoid warnings */
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signal(SIGINT, SIG_DFL); /* if another SIGINT happens before lstop,
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terminate process (default action) */
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old_linehook = lua_setlinehook(L, (lua_Hook)lstop);
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old_callhook = lua_setcallhook(L, (lua_Hook)lstop);
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}
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static int ldo (int (*f)(lua_State *l, const l_char *), const l_char *name,
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int clear) {
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int res;
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handler h = lreset();
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int top = lua_gettop(L);
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res = f(L, name); /* dostring | dofile */
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if (clear)
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lua_settop(L, top); /* remove eventual results */
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signal(SIGINT, h); /* restore old action */
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/* Lua gives no message in such cases, so lua.c provides one */
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if (res == LUA_ERRMEM) {
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fprintf(stderr, LUA_PROGNAME l_s("memory allocation error\n"));
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}
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else if (res == LUA_ERRERR)
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fprintf(stderr, LUA_PROGNAME l_s("error in error message\n"));
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return res;
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}
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static void print_message (void) {
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fprintf(stderr,
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l_s("usage: lua [options]. Available options are:\n")
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l_s(" - execute stdin as a file\n")
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l_s(" -c close Lua when exiting\n")
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l_s(" -e stat execute string `stat'\n")
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l_s(" -f name execute file `name' with remaining arguments in table `arg'\n")
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l_s(" -i enter interactive mode with prompt\n")
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l_s(" -q enter interactive mode without prompt\n")
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l_s(" -sNUM set stack size to NUM (must be the first option)\n")
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l_s(" -v print version information\n")
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l_s(" a=b set global `a' to string `b'\n")
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l_s(" name execute file `name'\n")
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);
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}
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static void print_version (void) {
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printf(l_s("%.80s %.80s\n"), l_s(LUA_VERSION), l_s(LUA_COPYRIGHT));
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}
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static void assign (l_char *arg) {
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l_char *eq = strchr(arg, l_c('='));
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*eq = l_c('\0'); /* spilt `arg' in two strings (name & value) */
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lua_pushstring(L, eq+1);
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lua_setglobal(L, arg);
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}
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static void getargs (l_char *argv[]) {
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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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/* arg[i] = argv[i] */
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lua_pushnumber(L, i);
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lua_pushstring(L, argv[i]);
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lua_settable(L, -3);
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}
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/* arg.n = maximum index in table `arg' */
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lua_pushliteral(L, l_s("n"));
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lua_pushnumber(L, i-1);
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lua_settable(L, -3);
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}
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static int l_getargs (lua_State *l) {
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l_char **argv = (l_char **)lua_touserdata(l, -1);
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getargs(argv);
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return 1;
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}
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static int file_input (const l_char *argv) {
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int result = ldo(lua_dofile, argv, 1);
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if (result) {
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if (result == LUA_ERRFILE) {
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fprintf(stderr, LUA_PROGNAME l_s("cannot execute file "));
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perror(argv);
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}
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return EXIT_FAILURE;
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}
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else
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return EXIT_SUCCESS;
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}
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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 const l_char *get_prompt (int prompt) {
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if (!prompt)
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return l_s("");
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else {
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const l_char *s;
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lua_getglobal(L, l_s("_PROMPT"));
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s = lua_tostring(L, -1);
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if (!s) s = PROMPT;
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lua_pop(L, 1); /* remove global */
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return s;
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}
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}
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static void manual_input (int version, int prompt) {
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if (version) print_version();
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for (;;) {
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int firstline = 1;
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int toprint = 0;
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fputs(get_prompt(prompt), stdout); /* show prompt */
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for(;;) {
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l_char buffer[MAXINPUT];
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size_t l;
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if (fgets(buffer, sizeof(buffer), stdin) == NULL) {
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printf(l_s("\n"));
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return;
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}
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if (firstline && buffer[0] == l_c('=')) {
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buffer[0] = l_c(' ');
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lua_pushstring(L, l_s("return"));
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toprint = 1;
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}
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l = strlen(buffer);
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if (buffer[l-1] == l_c('\n') && buffer[l-2] == l_c('\\')) {
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buffer[l-2] = l_c('\n');
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lua_pushlstring(L, buffer, l-1);
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}
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else {
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lua_pushlstring(L, buffer, l);
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break;
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}
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firstline = 0;
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}
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lua_concat(L, lua_gettop(L));
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ldo(lua_dostring, lua_tostring(L, 1), 0);
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lua_remove(L, 1); /* remove ran string */
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if (toprint && lua_gettop(L) > 0) { /* any result to print? */
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lua_getglobal(L, l_s("print"));
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lua_insert(L, 1);
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lua_call(L, lua_gettop(L)-1, 0);
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}
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else
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lua_settop(L, 0); /* remove eventual results */
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}
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}
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static int handle_argv (l_char *argv[], int *toclose) {
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if (*argv == NULL) { /* no more arguments? */
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if (isatty(0)) {
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manual_input(1, 1);
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}
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else
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ldo(lua_dofile, NULL, 1); /* 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 = 0; argv[i] != NULL; i++) {
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if (argv[i][0] != l_c('-')) { /* not an option? */
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if (strchr(argv[i], l_c('=')))
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assign(argv[i]);
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else
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if (file_input(argv[i]) != EXIT_SUCCESS)
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return EXIT_FAILURE; /* stop if file fails */
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}
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else switch (argv[i][1]) { /* option */
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case 0: {
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ldo(lua_dofile, NULL, 1); /* executes stdin as a file */
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break;
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}
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case l_c('i'): {
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manual_input(0, 1);
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break;
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}
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case l_c('q'): {
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manual_input(0, 0);
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break;
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}
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case l_c('c'): {
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*toclose = 1;
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break;
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}
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case l_c('v'): {
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print_version();
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break;
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}
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case l_c('e'): {
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i++;
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if (argv[i] == NULL) {
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print_message();
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return EXIT_FAILURE;
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}
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if (ldo(lua_dostring, argv[i], 1) != 0) {
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fprintf(stderr, LUA_PROGNAME l_s("error running argument `%.99s'\n"),
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argv[i]);
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return EXIT_FAILURE;
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}
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break;
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}
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case l_c('f'): {
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i++;
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if (argv[i] == NULL) {
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print_message();
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return EXIT_FAILURE;
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}
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getargs(argv+i); /* collect remaining arguments */
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lua_setglobal(L, l_s("arg"));
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return file_input(argv[i]); /* stop scanning arguments */
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}
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case l_c('s'): {
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if (i == 0) break; /* option already handled */
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fprintf(stderr,
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LUA_PROGNAME l_s("stack size (`-s') must be the first option\n"));
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return EXIT_FAILURE;
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}
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default: {
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print_message();
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return EXIT_FAILURE;
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}
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}
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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 getstacksize (int argc, l_char *argv[]) {
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int stacksize = 0;
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if (argc >= 2 && argv[1][0] == l_c('-') && argv[1][1] == l_c('s')) {
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stacksize = strtol(&argv[1][2], NULL, 10);
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if (stacksize <= 0) {
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fprintf(stderr, LUA_PROGNAME l_s("invalid stack size ('%.20s')\n"),
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&argv[1][2]);
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exit(EXIT_FAILURE);
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}
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}
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return stacksize;
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}
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static void register_getargs (l_char *argv[]) {
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lua_newuserdatabox(L, argv);
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lua_pushcclosure(L, l_getargs, 1);
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lua_setglobal(L, l_s("getargs"));
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}
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static void openstdlibs (lua_State *l) {
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lua_baselibopen(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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}
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int main (int argc, l_char *argv[]) {
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int status;
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int toclose = 0;
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L = lua_open(getstacksize(argc, argv)); /* create state */
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LUA_USERINIT(L); /* open libraries */
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register_getargs(argv); /* create `getargs' function */
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status = handle_argv(argv+1, &toclose);
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if (toclose)
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lua_close(L);
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return status;
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}
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