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rpg-x2/game/lua.c
UberGames bbdc52c075 initial commit
2011-06-01 14:20:56 +02:00

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/*
** $Id: lua.c,v 1.194 2010/10/25 19:01:37 roberto Exp $
** Lua stand-alone interpreter
** See Copyright Notice in lua.h
*/
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define lua_c
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
#if !defined(LUA_PROMPT)
#define LUA_PROMPT "> "
#define LUA_PROMPT2 ">> "
#endif
#if !defined(LUA_PROGNAME)
#define LUA_PROGNAME "lua"
#endif
#if !defined(LUA_MAXINPUT)
#define LUA_MAXINPUT 512
#endif
#if !defined(LUA_INIT)
#define LUA_INIT "LUA_INIT"
#endif
#define LUA_INITVERSION \
LUA_INIT "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
/*
** lua_stdin_is_tty detects whether the standard input is a 'tty' (that
** is, whether we're running lua interactively).
*/
#if defined(LUA_USE_ISATTY)
#include <unistd.h>
#define lua_stdin_is_tty() isatty(0)
#elif defined(LUA_WIN)
#include <io.h>
#include <stdio.h>
#define lua_stdin_is_tty() _isatty(_fileno(stdin))
#else
#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
#endif
/*
** lua_readline defines how to show a prompt and then read a line from
** the standard input.
** lua_saveline defines how to "save" a read line in a "history".
** lua_freeline defines how to free a line read by lua_readline.
*/
#if defined(LUA_USE_READLINE)
#include <stdio.h>
#include <readline/readline.h>
#include <readline/history.h>
#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
#define lua_saveline(L,idx) \
if (lua_rawlen(L,idx) > 0) /* non-empty line? */ \
add_history(lua_tostring(L, idx)); /* add it to history */
#define lua_freeline(L,b) ((void)L, free(b))
#elif !defined(lua_readline)
#define lua_readline(L,b,p) \
((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \
fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */
#define lua_saveline(L,idx) { (void)L; (void)idx; }
#define lua_freeline(L,b) { (void)L; (void)b; }
#endif
#if LUA_STANDALONE
static lua_State *globalL = NULL;
static const char *progname = LUA_PROGNAME;
static void lstop (lua_State *L, lua_Debug *ar) {
(void)ar; /* unused arg. */
lua_sethook(L, NULL, 0, 0);
luaL_error(L, "interrupted!");
}
static void laction (int i) {
signal(i, SIG_DFL); /* if another SIGINT happens before lstop,
terminate process (default action) */
lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
}
static void print_usage (const char *badoption) {
if (badoption[1] == 'e' || badoption[1] == 'l') {
luai_writestringerror("%s: ", progname);
luai_writestringerror("'%s' needs argument\n", badoption);
} else {
luai_writestringerror("%s: ", progname);
luai_writestringerror("unrecognized option '%s'\n", badoption);
}
luai_writestringerror(
"usage: %s [options] [script [args]]\n"
"Available options are:\n"
" -e stat execute string " LUA_QL("stat") "\n"
" -i enter interactive mode after executing " LUA_QL("script") "\n"
" -l name require library " LUA_QL("name") "\n"
" -v show version information\n"
" -- stop handling options\n"
" - stop handling options and execute stdin\n"
,
progname);
}
static void l_message (const char *pname, const char *msg) {
if (pname) luai_writestringerror("%s: ", pname);
luai_writestringerror("%s\n", msg);
}
static int report (lua_State *L, int status) {
if (status != LUA_OK && !lua_isnil(L, -1)) {
const char *msg = lua_tostring(L, -1);
if (msg == NULL) msg = "(error object is not a string)";
l_message(progname, msg);
lua_pop(L, 1);
/* force a complete garbage collection in case of errors */
lua_gc(L, LUA_GCCOLLECT, 0);
}
return status;
}
/* the next function is called unprotected, so it must avoid errors */
static void finalreport (lua_State *L, int status) {
if (status != LUA_OK) {
const char *msg = (lua_type(L, -1) == LUA_TSTRING) ? lua_tostring(L, -1)
: NULL;
if (msg == NULL) msg = "(error object is not a string)";
l_message(progname, msg);
lua_pop(L, 1);
}
}
static int traceback (lua_State *L) {
const char *msg = lua_tostring(L, 1);
if (msg)
luaL_traceback(L, L, msg, 1);
else if (!lua_isnoneornil(L, 1)) { /* is there an error object? */
if (!luaL_callmeta(L, 1, "__tostring")) /* try its 'tostring' metamethod */
lua_pushliteral(L, "(no error message)");
}
return 1;
}
static int docall (lua_State *L, int narg, int nres) {
int status;
int base = lua_gettop(L) - narg; /* function index */
lua_pushcfunction(L, traceback); /* push traceback function */
lua_insert(L, base); /* put it under chunk and args */
globalL = L; /* to be available to 'laction' */
signal(SIGINT, laction);
status = lua_pcall(L, narg, nres, base);
signal(SIGINT, SIG_DFL);
lua_remove(L, base); /* remove traceback function */
return status;
}
static void print_version (void) {
printf("%s\n", LUA_COPYRIGHT);
}
static int getargs (lua_State *L, char **argv, int n) {
int narg;
int i;
int argc = 0;
while (argv[argc]) argc++; /* count total number of arguments */
narg = argc - (n + 1); /* number of arguments to the script */
luaL_checkstack(L, narg + 3, "too many arguments to script");
for (i=n+1; i < argc; i++)
lua_pushstring(L, argv[i]);
lua_createtable(L, narg, n + 1);
for (i=0; i < argc; i++) {
lua_pushstring(L, argv[i]);
lua_rawseti(L, -2, i - n);
}
return narg;
}
static int dofile (lua_State *L, const char *name) {
int status = luaL_loadfile(L, name);
if (status == LUA_OK) status = docall(L, 0, 0);
return report(L, status);
}
static int dostring (lua_State *L, const char *s, const char *name) {
int status = luaL_loadbuffer(L, s, strlen(s), name);
if (status == LUA_OK) status = docall(L, 0, 0);
return report(L, status);
}
static int dolibrary (lua_State *L, const char *name) {
int status;
lua_pushglobaltable(L);
lua_getfield(L, -1, "require");
lua_pushstring(L, name);
status = docall(L, 1, 1);
if (status == LUA_OK) {
lua_setfield(L, -2, name); /* global[name] = require return */
lua_pop(L, 1); /* remove global table */
}
else
lua_remove(L, -2); /* remove global table (below error msg.) */
return report(L, status);
}
static const char *get_prompt (lua_State *L, int firstline) {
const char *p;
lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2");
p = lua_tostring(L, -1);
if (p == NULL) p = (firstline ? LUA_PROMPT : LUA_PROMPT2);
lua_pop(L, 1); /* remove global */
return p;
}
#endif
/* mark in error messages for incomplete statements */
#define mark "<eof>"
#define marklen (sizeof(mark) - 1)
#if LUA_STANDALONE
static int incomplete (lua_State *L, int status) {
if (status == LUA_ERRSYNTAX) {
size_t lmsg;
const char *msg = lua_tolstring(L, -1, &lmsg);
if (lmsg >= marklen && strcmp(msg + lmsg - marklen, mark) == 0) {
lua_pop(L, 1);
return 1;
}
}
return 0; /* else... */
}
static int pushline (lua_State *L, int firstline) {
char buffer[LUA_MAXINPUT];
char *b = buffer;
size_t l;
const char *prmt = get_prompt(L, firstline);
if (lua_readline(L, b, prmt) == 0)
return 0; /* no input */
l = strlen(b);
if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
b[l-1] = '\0'; /* remove it */
if (firstline && b[0] == '=') /* first line starts with `=' ? */
lua_pushfstring(L, "return %s", b+1); /* change it to `return' */
else
lua_pushstring(L, b);
lua_freeline(L, b);
return 1;
}
static int loadline (lua_State *L) {
int status;
lua_settop(L, 0);
if (!pushline(L, 1))
return -1; /* no input */
for (;;) { /* repeat until gets a complete line */
size_t l;
const char *line = lua_tolstring(L, 1, &l);
status = luaL_loadbuffer(L, line, l, "=stdin");
if (!incomplete(L, status)) break; /* cannot try to add lines? */
if (!pushline(L, 0)) /* no more input? */
return -1;
lua_pushliteral(L, "\n"); /* add a new line... */
lua_insert(L, -2); /* ...between the two lines */
lua_concat(L, 3); /* join them */
}
lua_saveline(L, 1);
lua_remove(L, 1); /* remove line */
return status;
}
static void dotty (lua_State *L) {
int status;
const char *oldprogname = progname;
progname = NULL;
while ((status = loadline(L)) != -1) {
if (status == LUA_OK) status = docall(L, 0, LUA_MULTRET);
report(L, status);
if (status == LUA_OK && lua_gettop(L) > 0) { /* any result to print? */
luaL_checkstack(L, LUA_MINSTACK, "too many results to print");
lua_getglobal(L, "print");
lua_insert(L, 1);
if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != LUA_OK)
l_message(progname, lua_pushfstring(L,
"error calling " LUA_QL("print") " (%s)",
lua_tostring(L, -1)));
}
}
lua_settop(L, 0); /* clear stack */
luai_writestring("\n", 1);
progname = oldprogname;
}
static int handle_script (lua_State *L, char **argv, int n) {
int status;
const char *fname;
int narg = getargs(L, argv, n); /* collect arguments */
lua_setglobal(L, "arg");
fname = argv[n];
if (strcmp(fname, "-") == 0 && strcmp(argv[n-1], "--") != 0)
fname = NULL; /* stdin */
status = luaL_loadfile(L, fname);
lua_insert(L, -(narg+1));
if (status == LUA_OK)
status = docall(L, narg, LUA_MULTRET);
else
lua_pop(L, narg);
return report(L, status);
}
#endif
/* check that argument has no extra characters at the end */
#define noextrachars(x) {if ((x)[2] != '\0') return -1;}
#if LUA_STANDALONE
static int collectargs (char **argv, int *pi, int *pv, int *pe) {
int i;
for (i = 1; argv[i] != NULL; i++) {
if (argv[i][0] != '-') /* not an option? */
return i;
switch (argv[i][1]) { /* option */
case '-':
noextrachars(argv[i]);
return (argv[i+1] != NULL ? i+1 : 0);
case '\0':
return i;
case 'i':
noextrachars(argv[i]);
*pi = 1; /* go through */
case 'v':
noextrachars(argv[i]);
*pv = 1;
break;
case 'e':
*pe = 1; /* go through */
case 'l': /* both options need an argument */
if (argv[i][2] == '\0') { /* no concatenated argument? */
i++; /* try next 'argv' */
if (argv[i] == NULL || argv[i][0] == '-')
return -(i - 1); /* no next argument or it is another option */
}
break;
default: /* invalid option; return its index... */
return -i; /* ...as a negative value */
}
}
return 0;
}
static int runargs (lua_State *L, char **argv, int n) {
int i;
for (i = 1; i < n; i++) {
lua_assert(argv[i][0] == '-');
switch (argv[i][1]) { /* option */
case 'e': {
const char *chunk = argv[i] + 2;
if (*chunk == '\0') chunk = argv[++i];
lua_assert(chunk != NULL);
if (dostring(L, chunk, "=(command line)") != LUA_OK)
return 0;
break;
}
case 'l': {
const char *filename = argv[i] + 2;
if (*filename == '\0') filename = argv[++i];
lua_assert(filename != NULL);
if (dolibrary(L, filename) != LUA_OK)
return 0; /* stop if file fails */
break;
}
default: break;
}
}
return 1;
}
static int handle_luainit (lua_State *L) {
const char *name = "=" LUA_INITVERSION;
const char *init = getenv(name + 1);
if (init == NULL) {
name = "=" LUA_INIT;
init = getenv(name + 1); /* try alternative name */
}
if (init == NULL) return LUA_OK;
else if (init[0] == '@')
return dofile(L, init+1);
else
return dostring(L, init, name);
}
static int pmain (lua_State *L) {
int argc = (int)lua_tointeger(L, 1);
char **argv = (char **)lua_touserdata(L, 2);
int script;
int has_i = 0, has_v = 0, has_e = 0;
if (argv[0] && argv[0][0]) progname = argv[0];
script = collectargs(argv, &has_i, &has_v, &has_e);
if (script < 0) { /* invalid arg? */
print_usage(argv[-script]);
return 0;
}
if (has_v) print_version();
/* open standard libraries */
luaL_checkversion(L);
lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
luaL_openlibs(L); /* open libraries */
lua_gc(L, LUA_GCRESTART, 0);
/* run LUA_INIT */
if (handle_luainit(L) != LUA_OK) return 0;
/* execute arguments -e and -l */
if (!runargs(L, argv, (script > 0) ? script : argc)) return 0;
/* execute main script (if there is one) */
if (script && handle_script(L, argv, script) != LUA_OK) return 0;
if (has_i) /* -i option? */
dotty(L);
else if (script == 0 && !has_e && !has_v) { /* no arguments? */
if (lua_stdin_is_tty()) {
print_version();
dotty(L);
}
else dofile(L, NULL); /* executes stdin as a file */
}
lua_pushboolean(L, 1); /* signal no errors */
return 1;
}
int main (int argc, char **argv) {
int status, result;
lua_State *L = luaL_newstate(); /* create state */
if (L == NULL) {
l_message(argv[0], "cannot create state: not enough memory");
return EXIT_FAILURE;
}
/* call 'pmain' in protected mode */
lua_pushcfunction(L, &pmain);
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;
}
#endif
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