#define lua_c
#include "lprefix.h"
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#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_VAR)
#define LUA_INIT_VAR "LUA_INIT"
#endif
#define LUA_INITVARVERSION \
LUA_INIT_VAR "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
#if !defined(lua_stdin_is_tty)
#if defined(LUA_USE_POSIX)
#include <unistd.h>
#define lua_stdin_is_tty() isatty(0)
#elif defined(LUA_USE_WINDOWS)
#include <io.h>
#define lua_stdin_is_tty() _isatty(_fileno(stdin))
#else
#define lua_stdin_is_tty() 1
#endif
#endif
#if !defined(lua_readline)
#if defined(LUA_USE_READLINE)
#include <readline/readline.h>
#include <readline/history.h>
#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
#define lua_saveline(L,line) ((void)L, add_history(line))
#define lua_freeline(L,b) ((void)L, free(b))
#else
#define lua_readline(L,b,p) \
((void)L, fputs(p, stdout), fflush(stdout), \
fgets(b, LUA_MAXINPUT, stdin) != NULL)
#define lua_saveline(L,line) { (void)L; (void)line; }
#define lua_freeline(L,b) { (void)L; (void)b; }
#endif
#endif
static lua_State *globalL = NULL;
static const char *progname = LUA_PROGNAME;
static void lstop (lua_State *L, lua_Debug *ar) {
(void)ar;
lua_sethook(L, NULL, 0, 0);
luaL_error(L, "interrupted!");
}
static void laction (int i) {
signal(i, SIG_DFL);
lua_sethook(globalL, lstop, LUA_MASKCALL | LUA_MASKRET | LUA_MASKCOUNT, 1);
}
static void print_usage (const char *badoption) {
lua_writestringerror("%s: ", progname);
if (badoption[1] == 'e' || badoption[1] == 'l')
lua_writestringerror("'%s' needs argument\n", badoption);
else
lua_writestringerror("unrecognized option '%s'\n", badoption);
lua_writestringerror(
"usage: %s [options] [script [args]]\n"
"Available options are:\n"
" -e stat execute string 'stat'\n"
" -i enter interactive mode after executing 'script'\n"
" -l name require library 'name'\n"
" -v show version information\n"
" -E ignore environment variables\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) lua_writestringerror("%s: ", pname);
lua_writestringerror("%s\n", msg);
}
static int report (lua_State *L, int status) {
if (status != LUA_OK) {
const char *msg = lua_tostring(L, -1);
l_message(progname, msg);
lua_pop(L, 1);
}
return status;
}
static int msghandler (lua_State *L) {
const char *msg = lua_tostring(L, 1);
if (msg == NULL) {
if (luaL_callmeta(L, 1, "__tostring") &&
lua_type(L, -1) == LUA_TSTRING)
return 1;
else
msg = lua_pushfstring(L, "(error object is a %s value)",
luaL_typename(L, 1));
}
luaL_traceback(L, L, msg, 1);
return 1;
}
static int docall (lua_State *L, int narg, int nres) {
int status;
int base = lua_gettop(L) - narg;
lua_pushcfunction(L, msghandler);
lua_insert(L, base);
globalL = L;
signal(SIGINT, laction);
status = lua_pcall(L, narg, nres, base);
signal(SIGINT, SIG_DFL);
lua_remove(L, base);
return status;
}
static void print_version (void) {
lua_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
lua_writeline();
}
static void createargtable (lua_State *L, char **argv, int argc, int script) {
int i, narg;
if (script == argc) script = 0;
narg = argc - (script + 1);
lua_createtable(L, narg, script + 1);
for (i = 0; i < argc; i++) {
lua_pushstring(L, argv[i]);
lua_rawseti(L, -2, i - script);
}
lua_setglobal(L, "arg");
}
static int dochunk (lua_State *L, int status) {
if (status == LUA_OK) status = docall(L, 0, 0);
return report(L, status);
}
static int dofile (lua_State *L, const char *name) {
return dochunk(L, luaL_loadfile(L, name));
}
static int dostring (lua_State *L, const char *s, const char *name) {
return dochunk(L, luaL_loadbuffer(L, s, strlen(s), name));
}
static int dolibrary (lua_State *L, const char *name) {
int status;
lua_getglobal(L, "require");
lua_pushstring(L, name);
status = docall(L, 1, 1);
if (status == LUA_OK)
lua_setglobal(L, name);
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);
return p;
}
#define EOFMARK "<eof>"
#define marklen (sizeof(EOFMARK)/sizeof(char) - 1)
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, EOFMARK) == 0) {
lua_pop(L, 1);
return 1;
}
}
return 0;
}
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);
int readstatus = lua_readline(L, b, prmt);
if (readstatus == 0)
return 0;
lua_pop(L, 1);
l = strlen(b);
if (l > 0 && b[l-1] == '\n')
b[--l] = '\0';
if (firstline && b[0] == '=')
lua_pushfstring(L, "return %s", b + 1);
else
lua_pushlstring(L, b, l);
lua_freeline(L, b);
return 1;
}
static int addreturn (lua_State *L) {
int status;
size_t len; const char *line;
lua_pushliteral(L, "return ");
lua_pushvalue(L, -2);
lua_concat(L, 2);
line = lua_tolstring(L, -1, &len);
if ((status = luaL_loadbuffer(L, line, len, "=stdin")) == LUA_OK) {
lua_remove(L, -3);
line += sizeof("return")/sizeof(char);
if (line[0] != '\0')
lua_saveline(L, line);
}
else
lua_pop(L, 2);
return status;
}
static int multiline (lua_State *L) {
for (;;) {
size_t len;
const char *line = lua_tolstring(L, 1, &len);
int status = luaL_loadbuffer(L, line, len, "=stdin");
if (!incomplete(L, status) || !pushline(L, 0)) {
lua_saveline(L, line);
return status;
}
lua_pushliteral(L, "\n");
lua_insert(L, -2);
lua_concat(L, 3);
}
}
static int loadline (lua_State *L) {
int status;
lua_settop(L, 0);
if (!pushline(L, 1))
return -1;
if ((status = addreturn(L)) != LUA_OK)
status = multiline(L);
lua_remove(L, 1);
lua_assert(lua_gettop(L) == 1);
return status;
}
static void l_print (lua_State *L) {
int n = lua_gettop(L);
if (n > 0) {
luaL_checkstack(L, LUA_MINSTACK, "too many results to print");
lua_getglobal(L, "print");
lua_insert(L, 1);
if (lua_pcall(L, n, 0, 0) != LUA_OK)
l_message(progname, lua_pushfstring(L, "error calling 'print' (%s)",
lua_tostring(L, -1)));
}
}
static void doREPL (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);
if (status == LUA_OK) l_print(L);
else report(L, status);
}
lua_settop(L, 0);
lua_writeline();
progname = oldprogname;
}
static int pushargs (lua_State *L) {
int i, n;
if (lua_getglobal(L, "arg") != LUA_TTABLE)
luaL_error(L, "'arg' is not a table");
n = (int)luaL_len(L, -1);
luaL_checkstack(L, n + 3, "too many arguments to script");
for (i = 1; i <= n; i++)
lua_rawgeti(L, -i, i);
lua_remove(L, -i);
return n;
}
static int handle_script (lua_State *L, char **argv) {
int status;
const char *fname = argv[0];
if (strcmp(fname, "-") == 0 && strcmp(argv[-1], "--") != 0)
fname = NULL;
status = luaL_loadfile(L, fname);
if (status == LUA_OK) {
int n = pushargs(L);
status = docall(L, n, LUA_MULTRET);
}
return report(L, status);
}
#define has_error 1
#define has_i 2
#define has_v 4
#define has_e 8
#define has_E 16
static int collectargs (char **argv, int *first) {
int args = 0;
int i;
for (i = 1; argv[i] != NULL; i++) {
*first = i;
if (argv[i][0] != '-')
return args;
switch (argv[i][1]) {
case '-':
if (argv[i][2] != '\0')
return has_error;
*first = i + 1;
return args;
case '\0':
return args;
case 'E':
if (argv[i][2] != '\0')
return has_error;
args |= has_E;
break;
case 'i':
args |= has_i;
case 'v':
if (argv[i][2] != '\0')
return has_error;
args |= has_v;
break;
case 'e':
args |= has_e;
case 'l':
if (argv[i][2] == '\0') {
i++;
if (argv[i] == NULL || argv[i][0] == '-')
return has_error;
}
break;
default:
return has_error;
}
}
*first = i;
return args;
}
static int runargs (lua_State *L, char **argv, int n) {
int i;
for (i = 1; i < n; i++) {
int option = argv[i][1];
lua_assert(argv[i][0] == '-');
if (option == 'e' || option == 'l') {
int status;
const char *extra = argv[i] + 2;
if (*extra == '\0') extra = argv[++i];
lua_assert(extra != NULL);
status = (option == 'e')
? dostring(L, extra, "=(command line)")
: dolibrary(L, extra);
if (status != LUA_OK) return 0;
}
}
return 1;
}
static int handle_luainit (lua_State *L) {
const char *name = "=" LUA_INITVARVERSION;
const char *init = getenv(name + 1);
if (init == NULL) {
name = "=" LUA_INIT_VAR;
init = getenv(name + 1);
}
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 args = collectargs(argv, &script);
luaL_checkversion(L);
if (argv[0] && argv[0][0]) progname = argv[0];
if (args == has_error) {
print_usage(argv[script]);
return 0;
}
if (args & has_v)
print_version();
if (args & has_E) {
lua_pushboolean(L, 1);
lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
}
luaL_openlibs(L);
createargtable(L, argv, argc, script);
if (!(args & has_E)) {
if (handle_luainit(L) != LUA_OK)
return 0;
}
if (!runargs(L, argv, script))
return 0;
if (script < argc &&
handle_script(L, argv + script) != LUA_OK)
return 0;
if (args & has_i)
doREPL(L);
else if (script == argc && !(args & (has_e | has_v))) {
if (lua_stdin_is_tty()) {
print_version();
doREPL(L);
}
else dofile(L, NULL);
}
lua_pushboolean(L, 1);
return 1;
}
int main (int argc, char **argv) {
int status, result;
lua_State *L = luaL_newstate();
if (L == NULL) {
l_message(argv[0], "cannot create state: not enough memory");
return EXIT_FAILURE;
}
lua_pushcfunction(L, &pmain);
lua_pushinteger(L, argc);
lua_pushlightuserdata(L, argv);
status = lua_pcall(L, 2, 1, 0);
result = lua_toboolean(L, -1);
report(L, status);
lua_close(L);
return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
}