393 lines
9.9 KiB
C
393 lines
9.9 KiB
C
/*
|
|
** $Id: lua.c 753 2010-01-25 07:58:31Z miros $
|
|
** 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"
|
|
|
|
|
|
|
|
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 (void) {
|
|
fprintf(stderr,
|
|
"usage: %s [options] [script [args]].\n"
|
|
"Available options are:\n"
|
|
" -e stat execute string " LUA_QL("stat") "\n"
|
|
" -l name require library " LUA_QL("name") "\n"
|
|
" -i enter interactive mode after executing " LUA_QL("script") "\n"
|
|
" -v show version information\n"
|
|
" -- stop handling options\n"
|
|
" - execute stdin and stop handling options\n"
|
|
,
|
|
progname);
|
|
fflush(stderr);
|
|
}
|
|
|
|
|
|
static void l_message (const char *pname, const char *msg) {
|
|
if (pname) fprintf(stderr, "%s: ", pname);
|
|
fprintf(stderr, "%s\n", msg);
|
|
fflush(stderr);
|
|
}
|
|
|
|
|
|
static int report (lua_State *L, int status) {
|
|
if (status && !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);
|
|
}
|
|
return status;
|
|
}
|
|
|
|
|
|
static int traceback (lua_State *L) {
|
|
if (!lua_isstring(L, 1)) /* 'message' not a string? */
|
|
return 1; /* keep it intact */
|
|
lua_getfield(L, LUA_GLOBALSINDEX, "debug");
|
|
if (!lua_istable(L, -1)) {
|
|
lua_pop(L, 1);
|
|
return 1;
|
|
}
|
|
lua_getfield(L, -1, "traceback");
|
|
if (!lua_isfunction(L, -1)) {
|
|
lua_pop(L, 2);
|
|
return 1;
|
|
}
|
|
lua_pushvalue(L, 1); /* pass error message */
|
|
lua_pushinteger(L, 2); /* skip this function and traceback */
|
|
lua_call(L, 2, 1); /* call debug.traceback */
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int docall (lua_State *L, int narg, int clear) {
|
|
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 */
|
|
signal(SIGINT, laction);
|
|
status = lua_pcall(L, narg, (clear ? 0 : LUA_MULTRET), base);
|
|
signal(SIGINT, SIG_DFL);
|
|
lua_remove(L, base); /* remove traceback function */
|
|
/* force a complete garbage collection in case of errors */
|
|
if (status != 0) lua_gc(L, LUA_GCCOLLECT, 0);
|
|
return status;
|
|
}
|
|
|
|
|
|
static void print_version (void) {
|
|
l_message(NULL, LUA_RELEASE " " 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) || docall(L, 0, 1);
|
|
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) || docall(L, 0, 1);
|
|
return report(L, status);
|
|
}
|
|
|
|
|
|
static int dolibrary (lua_State *L, const char *name) {
|
|
lua_getglobal(L, "require");
|
|
lua_pushstring(L, name);
|
|
return report(L, docall(L, 1, 1));
|
|
}
|
|
|
|
|
|
static const char *get_prompt (lua_State *L, int firstline) {
|
|
const char *p;
|
|
lua_getfield(L, LUA_GLOBALSINDEX, 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;
|
|
}
|
|
|
|
|
|
static int incomplete (lua_State *L, int status) {
|
|
if (status == LUA_ERRSYNTAX) {
|
|
size_t lmsg;
|
|
const char *msg = lua_tolstring(L, -1, &lmsg);
|
|
const char *tp = msg + lmsg - (sizeof(LUA_QL("<eof>")) - 1);
|
|
if (strstr(msg, LUA_QL("<eof>")) == tp) {
|
|
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 */
|
|
status = luaL_loadbuffer(L, lua_tostring(L, 1), lua_strlen(L, 1), "=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 == 0) status = docall(L, 0, 0);
|
|
report(L, status);
|
|
if (status == 0 && lua_gettop(L) > 0) { /* any result to print? */
|
|
lua_getglobal(L, "print");
|
|
lua_insert(L, 1);
|
|
if (lua_pcall(L, lua_gettop(L)-1, 0, 0) != 0)
|
|
l_message(progname, lua_pushfstring(L,
|
|
"error calling " LUA_QL("print") " (%s)",
|
|
lua_tostring(L, -1)));
|
|
}
|
|
}
|
|
lua_settop(L, 0); /* clear stack */
|
|
fputs("\n", stdout);
|
|
fflush(stdout);
|
|
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 == 0)
|
|
status = docall(L, narg, 0);
|
|
else
|
|
lua_pop(L, narg);
|
|
return report(L, status);
|
|
}
|
|
|
|
|
|
/* check that argument has no extra characters at the end */
|
|
#define notail(x) {if ((x)[2] != '\0') return -1;}
|
|
|
|
|
|
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 '-':
|
|
notail(argv[i]);
|
|
return (argv[i+1] != NULL ? i+1 : 0);
|
|
case '\0':
|
|
return i;
|
|
case 'i':
|
|
notail(argv[i]);
|
|
*pi = 1; /* go through */
|
|
case 'v':
|
|
notail(argv[i]);
|
|
*pv = 1;
|
|
break;
|
|
case 'e':
|
|
*pe = 1; /* go through */
|
|
case 'l':
|
|
if (argv[i][2] == '\0') {
|
|
i++;
|
|
if (argv[i] == NULL) return -1;
|
|
}
|
|
break;
|
|
default: return -1; /* invalid option */
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int runargs (lua_State *L, char **argv, int n) {
|
|
int i;
|
|
for (i = 1; i < n; i++) {
|
|
if (argv[i] == NULL) continue;
|
|
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)") != 0)
|
|
return 1;
|
|
break;
|
|
}
|
|
case 'l': {
|
|
const char *filename = argv[i] + 2;
|
|
if (*filename == '\0') filename = argv[++i];
|
|
lua_assert(filename != NULL);
|
|
if (dolibrary(L, filename))
|
|
return 1; /* stop if file fails */
|
|
break;
|
|
}
|
|
default: break;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int handle_luainit (lua_State *L) {
|
|
const char *init = getenv(LUA_INIT);
|
|
if (init == NULL) return 0; /* status OK */
|
|
else if (init[0] == '@')
|
|
return dofile(L, init+1);
|
|
else
|
|
return dostring(L, init, "=" LUA_INIT);
|
|
}
|
|
|
|
|
|
struct Smain {
|
|
int argc;
|
|
char **argv;
|
|
int status;
|
|
};
|
|
|
|
|
|
static int pmain (lua_State *L) {
|
|
struct Smain *s = (struct Smain *)lua_touserdata(L, 1);
|
|
char **argv = s->argv;
|
|
int script;
|
|
int has_i = 0, has_v = 0, has_e = 0;
|
|
globalL = L;
|
|
if (argv[0] && argv[0][0]) progname = argv[0];
|
|
lua_gc(L, LUA_GCSTOP, 0); /* stop collector during initialization */
|
|
luaL_openlibs(L); /* open libraries */
|
|
lua_gc(L, LUA_GCRESTART, 0);
|
|
s->status = handle_luainit(L);
|
|
if (s->status != 0) return 0;
|
|
script = collectargs(argv, &has_i, &has_v, &has_e);
|
|
if (script < 0) { /* invalid args? */
|
|
print_usage();
|
|
s->status = 1;
|
|
return 0;
|
|
}
|
|
if (has_v) print_version();
|
|
s->status = runargs(L, argv, (script > 0) ? script : s->argc);
|
|
if (s->status != 0) return 0;
|
|
if (script)
|
|
s->status = handle_script(L, argv, script);
|
|
if (s->status != 0) return 0;
|
|
if (has_i)
|
|
dotty(L);
|
|
else if (script == 0 && !has_e && !has_v) {
|
|
if (lua_stdin_is_tty()) {
|
|
print_version();
|
|
dotty(L);
|
|
}
|
|
else dofile(L, NULL); /* executes stdin as a file */
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
int main (int argc, char **argv) {
|
|
int status;
|
|
struct Smain s;
|
|
lua_State *L = lua_open(); /* create state */
|
|
if (L == NULL) {
|
|
l_message(argv[0], "cannot create state: not enough memory");
|
|
return EXIT_FAILURE;
|
|
}
|
|
s.argc = argc;
|
|
s.argv = argv;
|
|
status = lua_cpcall(L, &pmain, &s);
|
|
report(L, status);
|
|
lua_close(L);
|
|
return (status || s.status) ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
}
|
|
|