add lua.c from Lua 5.4.6
This commit is contained in:
Matt Boney
parent
3dfc8613c5
commit
181957913a
1 changed files with 679 additions and 0 deletions
679
src/lua54.c
Normal file
679
src/lua54.c
Normal file
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@ -0,0 +1,679 @@
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/*
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** $Id: lua.c $
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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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#define lua_c
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#include "lprefix.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 <signal.h>
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#include "lua.h"
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#include "lauxlib.h"
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#include "lualib.h"
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#if !defined(LUA_PROGNAME)
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#define LUA_PROGNAME "lua"
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#endif
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#if !defined(LUA_INIT_VAR)
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#define LUA_INIT_VAR "LUA_INIT"
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#endif
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#define LUA_INITVARVERSION LUA_INIT_VAR LUA_VERSUFFIX
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static lua_State *globalL = NULL;
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static const char *progname = LUA_PROGNAME;
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#if defined(LUA_USE_POSIX) /* { */
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/*
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** Use 'sigaction' when available.
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*/
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static void setsignal (int sig, void (*handler)(int)) {
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struct sigaction sa;
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sa.sa_handler = handler;
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sa.sa_flags = 0;
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sigemptyset(&sa.sa_mask); /* do not mask any signal */
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sigaction(sig, &sa, NULL);
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}
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#else /* }{ */
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#define setsignal signal
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#endif /* } */
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/*
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** Hook set by signal function to stop the interpreter.
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*/
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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, NULL, 0, 0); /* reset hook */
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luaL_error(L, "interrupted!");
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}
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/*
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** Function to be called at a C signal. Because a C signal cannot
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** just change a Lua state (as there is no proper synchronization),
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** this function only sets a hook that, when called, will stop the
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** interpreter.
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*/
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static void laction (int i) {
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int flag = LUA_MASKCALL | LUA_MASKRET | LUA_MASKLINE | LUA_MASKCOUNT;
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setsignal(i, SIG_DFL); /* if another SIGINT happens, terminate process */
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lua_sethook(globalL, lstop, flag, 1);
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}
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static void print_usage (const char *badoption) {
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lua_writestringerror("%s: ", progname);
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if (badoption[1] == 'e' || badoption[1] == 'l')
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lua_writestringerror("'%s' needs argument\n", badoption);
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else
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lua_writestringerror("unrecognized option '%s'\n", badoption);
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lua_writestringerror(
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"usage: %s [options] [script [args]]\n"
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"Available options are:\n"
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" -e stat execute string 'stat'\n"
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" -i enter interactive mode after executing 'script'\n"
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" -l mod require library 'mod' into global 'mod'\n"
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" -l g=mod require library 'mod' into global 'g'\n"
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" -v show version information\n"
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" -E ignore environment variables\n"
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" -W turn warnings on\n"
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" -- stop handling options\n"
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" - stop handling options and execute stdin\n"
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,
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progname);
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}
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/*
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** Prints an error message, adding the program name in front of it
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** (if present)
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*/
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static void l_message (const char *pname, const char *msg) {
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if (pname) lua_writestringerror("%s: ", pname);
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lua_writestringerror("%s\n", msg);
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}
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/*
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** Check whether 'status' is not OK and, if so, prints the error
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** message on the top of the stack. It assumes that the error object
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** is a string, as it was either generated by Lua or by 'msghandler'.
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*/
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static int report (lua_State *L, int status) {
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if (status != LUA_OK) {
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const char *msg = lua_tostring(L, -1);
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l_message(progname, msg);
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lua_pop(L, 1); /* remove message */
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}
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return status;
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}
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/*
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** Message handler used to run all chunks
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*/
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static int msghandler (lua_State *L) {
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const char *msg = lua_tostring(L, 1);
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if (msg == NULL) { /* is error object not a string? */
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if (luaL_callmeta(L, 1, "__tostring") && /* does it have a metamethod */
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lua_type(L, -1) == LUA_TSTRING) /* that produces a string? */
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return 1; /* that is the message */
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else
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msg = lua_pushfstring(L, "(error object is a %s value)",
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luaL_typename(L, 1));
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}
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luaL_traceback(L, L, msg, 1); /* append a standard traceback */
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return 1; /* return the traceback */
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}
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/*
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** Interface to 'lua_pcall', which sets appropriate message function
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** and C-signal handler. Used to run all chunks.
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*/
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static int docall (lua_State *L, int narg, int nres) {
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int status;
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int base = lua_gettop(L) - narg; /* function index */
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lua_pushcfunction(L, msghandler); /* push message handler */
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lua_insert(L, base); /* put it under function and args */
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globalL = L; /* to be available to 'laction' */
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setsignal(SIGINT, laction); /* set C-signal handler */
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status = lua_pcall(L, narg, nres, base);
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setsignal(SIGINT, SIG_DFL); /* reset C-signal handler */
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lua_remove(L, base); /* remove message handler from the stack */
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return status;
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}
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static void print_version (void) {
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lua_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
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lua_writeline();
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}
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/*
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** Create the 'arg' table, which stores all arguments from the
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** command line ('argv'). It should be aligned so that, at index 0,
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** it has 'argv[script]', which is the script name. The arguments
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** to the script (everything after 'script') go to positive indices;
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** other arguments (before the script name) go to negative indices.
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** If there is no script name, assume interpreter's name as base.
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** (If there is no interpreter's name either, 'script' is -1, so
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** table sizes are zero.)
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*/
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static void createargtable (lua_State *L, char **argv, int argc, int script) {
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int i, narg;
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narg = argc - (script + 1); /* number of positive indices */
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lua_createtable(L, narg, script + 1);
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for (i = 0; i < argc; i++) {
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lua_pushstring(L, argv[i]);
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lua_rawseti(L, -2, i - script);
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}
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lua_setglobal(L, "arg");
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}
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static int dochunk (lua_State *L, int status) {
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if (status == LUA_OK) status = docall(L, 0, 0);
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return report(L, status);
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}
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static int dofile (lua_State *L, const char *name) {
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return dochunk(L, luaL_loadfile(L, name));
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}
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static int dostring (lua_State *L, const char *s, const char *name) {
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return dochunk(L, luaL_loadbuffer(L, s, strlen(s), name));
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}
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/*
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** Receives 'globname[=modname]' and runs 'globname = require(modname)'.
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*/
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static int dolibrary (lua_State *L, char *globname) {
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int status;
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char *modname = strchr(globname, '=');
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if (modname == NULL) /* no explicit name? */
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modname = globname; /* module name is equal to global name */
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else {
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*modname = '\0'; /* global name ends here */
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modname++; /* module name starts after the '=' */
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}
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lua_getglobal(L, "require");
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lua_pushstring(L, modname);
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status = docall(L, 1, 1); /* call 'require(modname)' */
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if (status == LUA_OK)
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lua_setglobal(L, globname); /* globname = require(modname) */
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return report(L, status);
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}
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/*
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** Push on the stack the contents of table 'arg' from 1 to #arg
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*/
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static int pushargs (lua_State *L) {
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int i, n;
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if (lua_getglobal(L, "arg") != LUA_TTABLE)
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luaL_error(L, "'arg' is not a table");
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n = (int)luaL_len(L, -1);
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luaL_checkstack(L, n + 3, "too many arguments to script");
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for (i = 1; i <= n; i++)
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lua_rawgeti(L, -i, i);
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lua_remove(L, -i); /* remove table from the stack */
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return n;
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}
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static int handle_script (lua_State *L, char **argv) {
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int status;
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const char *fname = argv[0];
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if (strcmp(fname, "-") == 0 && strcmp(argv[-1], "--") != 0)
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fname = NULL; /* stdin */
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status = luaL_loadfile(L, fname);
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if (status == LUA_OK) {
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int n = pushargs(L); /* push arguments to script */
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status = docall(L, n, LUA_MULTRET);
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}
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return report(L, status);
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}
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/* bits of various argument indicators in 'args' */
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#define has_error 1 /* bad option */
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#define has_i 2 /* -i */
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#define has_v 4 /* -v */
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#define has_e 8 /* -e */
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#define has_E 16 /* -E */
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/*
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** Traverses all arguments from 'argv', returning a mask with those
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** needed before running any Lua code or an error code if it finds any
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** invalid argument. In case of error, 'first' is the index of the bad
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** argument. Otherwise, 'first' is -1 if there is no program name,
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** 0 if there is no script name, or the index of the script name.
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*/
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static int collectargs (char **argv, int *first) {
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int args = 0;
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int i;
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if (argv[0] != NULL) { /* is there a program name? */
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if (argv[0][0]) /* not empty? */
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progname = argv[0]; /* save it */
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}
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else { /* no program name */
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*first = -1;
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return 0;
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}
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for (i = 1; argv[i] != NULL; i++) { /* handle arguments */
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*first = i;
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if (argv[i][0] != '-') /* not an option? */
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return args; /* stop handling options */
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switch (argv[i][1]) { /* else check option */
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case '-': /* '--' */
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if (argv[i][2] != '\0') /* extra characters after '--'? */
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return has_error; /* invalid option */
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*first = i + 1;
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return args;
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case '\0': /* '-' */
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return args; /* script "name" is '-' */
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case 'E':
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if (argv[i][2] != '\0') /* extra characters? */
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return has_error; /* invalid option */
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args |= has_E;
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break;
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case 'W':
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if (argv[i][2] != '\0') /* extra characters? */
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return has_error; /* invalid option */
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break;
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case 'i':
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args |= has_i; /* (-i implies -v) *//* FALLTHROUGH */
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case 'v':
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if (argv[i][2] != '\0') /* extra characters? */
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return has_error; /* invalid option */
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args |= has_v;
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break;
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case 'e':
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args |= has_e; /* FALLTHROUGH */
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case 'l': /* both options need an argument */
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if (argv[i][2] == '\0') { /* no concatenated argument? */
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i++; /* try next 'argv' */
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if (argv[i] == NULL || argv[i][0] == '-')
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return has_error; /* no next argument or it is another option */
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}
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break;
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default: /* invalid option */
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return has_error;
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}
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}
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*first = 0; /* no script name */
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return args;
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}
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/*
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** Processes options 'e' and 'l', which involve running Lua code, and
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** 'W', which also affects the state.
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** Returns 0 if some code raises an error.
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*/
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static int runargs (lua_State *L, char **argv, int n) {
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int i;
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for (i = 1; i < n; i++) {
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int option = argv[i][1];
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lua_assert(argv[i][0] == '-'); /* already checked */
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switch (option) {
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case 'e': case 'l': {
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int status;
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char *extra = argv[i] + 2; /* both options need an argument */
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if (*extra == '\0') extra = argv[++i];
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lua_assert(extra != NULL);
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status = (option == 'e')
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? dostring(L, extra, "=(command line)")
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: dolibrary(L, extra);
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if (status != LUA_OK) return 0;
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break;
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}
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case 'W':
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lua_warning(L, "@on", 0); /* warnings on */
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break;
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}
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}
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return 1;
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}
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static int handle_luainit (lua_State *L) {
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const char *name = "=" LUA_INITVARVERSION;
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const char *init = getenv(name + 1);
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if (init == NULL) {
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name = "=" LUA_INIT_VAR;
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init = getenv(name + 1); /* try alternative name */
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}
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if (init == NULL) return LUA_OK;
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else if (init[0] == '@')
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return dofile(L, init+1);
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else
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return dostring(L, init, name);
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}
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/*
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** {==================================================================
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** Read-Eval-Print Loop (REPL)
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** ===================================================================
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*/
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#if !defined(LUA_PROMPT)
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#define LUA_PROMPT "> "
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#define LUA_PROMPT2 ">> "
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#endif
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#if !defined(LUA_MAXINPUT)
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#define LUA_MAXINPUT 512
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#endif
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/*
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** lua_stdin_is_tty detects whether the standard input is a 'tty' (that
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** is, whether we're running lua interactively).
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*/
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#if !defined(lua_stdin_is_tty) /* { */
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#if defined(LUA_USE_POSIX) /* { */
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#include <unistd.h>
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#define lua_stdin_is_tty() isatty(0)
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#elif defined(LUA_USE_WINDOWS) /* }{ */
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#include <io.h>
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#include <windows.h>
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#define lua_stdin_is_tty() _isatty(_fileno(stdin))
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#else /* }{ */
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/* ISO C definition */
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#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
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#endif /* } */
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#endif /* } */
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/*
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** lua_readline defines how to show a prompt and then read a line from
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** the standard input.
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** lua_saveline defines how to "save" a read line in a "history".
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** lua_freeline defines how to free a line read by lua_readline.
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*/
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#if !defined(lua_readline) /* { */
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#if defined(LUA_USE_READLINE) /* { */
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#include <readline/readline.h>
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#include <readline/history.h>
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#define lua_initreadline(L) ((void)L, rl_readline_name="lua")
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#define lua_readline(L,b,p) ((void)L, ((b)=readline(p)) != NULL)
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#define lua_saveline(L,line) ((void)L, add_history(line))
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#define lua_freeline(L,b) ((void)L, free(b))
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#else /* }{ */
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#define lua_initreadline(L) ((void)L)
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#define lua_readline(L,b,p) \
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((void)L, fputs(p, stdout), fflush(stdout), /* show prompt */ \
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fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */
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#define lua_saveline(L,line) { (void)L; (void)line; }
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#define lua_freeline(L,b) { (void)L; (void)b; }
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#endif /* } */
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#endif /* } */
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/*
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** Return the string to be used as a prompt by the interpreter. Leave
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** the string (or nil, if using the default value) on the stack, to keep
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** it anchored.
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*/
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static const char *get_prompt (lua_State *L, int firstline) {
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if (lua_getglobal(L, firstline ? "_PROMPT" : "_PROMPT2") == LUA_TNIL)
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return (firstline ? LUA_PROMPT : LUA_PROMPT2); /* use the default */
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else { /* apply 'tostring' over the value */
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const char *p = luaL_tolstring(L, -1, NULL);
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lua_remove(L, -2); /* remove original value */
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return p;
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}
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}
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/* mark in error messages for incomplete statements */
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#define EOFMARK "<eof>"
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#define marklen (sizeof(EOFMARK)/sizeof(char) - 1)
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/*
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** Check whether 'status' signals a syntax error and the error
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** message at the top of the stack ends with the above mark for
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** incomplete statements.
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*/
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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; /* else... */
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** Prompt the user, read a line, and push it into the Lua stack.
|
||||
*/
|
||||
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; /* no input (prompt will be popped by caller) */
|
||||
lua_pop(L, 1); /* remove prompt */
|
||||
l = strlen(b);
|
||||
if (l > 0 && b[l-1] == '\n') /* line ends with newline? */
|
||||
b[--l] = '\0'; /* remove it */
|
||||
if (firstline && b[0] == '=') /* for compatibility with 5.2, ... */
|
||||
lua_pushfstring(L, "return %s", b + 1); /* change '=' to 'return' */
|
||||
else
|
||||
lua_pushlstring(L, b, l);
|
||||
lua_freeline(L, b);
|
||||
return 1;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** Try to compile line on the stack as 'return <line>;'; on return, stack
|
||||
** has either compiled chunk or original line (if compilation failed).
|
||||
*/
|
||||
static int addreturn (lua_State *L) {
|
||||
const char *line = lua_tostring(L, -1); /* original line */
|
||||
const char *retline = lua_pushfstring(L, "return %s;", line);
|
||||
int status = luaL_loadbuffer(L, retline, strlen(retline), "=stdin");
|
||||
if (status == LUA_OK) {
|
||||
lua_remove(L, -2); /* remove modified line */
|
||||
if (line[0] != '\0') /* non empty? */
|
||||
lua_saveline(L, line); /* keep history */
|
||||
}
|
||||
else
|
||||
lua_pop(L, 2); /* pop result from 'luaL_loadbuffer' and modified line */
|
||||
return status;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** Read multiple lines until a complete Lua statement
|
||||
*/
|
||||
static int multiline (lua_State *L) {
|
||||
for (;;) { /* repeat until gets a complete statement */
|
||||
size_t len;
|
||||
const char *line = lua_tolstring(L, 1, &len); /* get what it has */
|
||||
int status = luaL_loadbuffer(L, line, len, "=stdin"); /* try it */
|
||||
if (!incomplete(L, status) || !pushline(L, 0)) {
|
||||
lua_saveline(L, line); /* keep history */
|
||||
return status; /* cannot or should not try to add continuation line */
|
||||
}
|
||||
lua_pushliteral(L, "\n"); /* add newline... */
|
||||
lua_insert(L, -2); /* ...between the two lines */
|
||||
lua_concat(L, 3); /* join them */
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** Read a line and try to load (compile) it first as an expression (by
|
||||
** adding "return " in front of it) and second as a statement. Return
|
||||
** the final status of load/call with the resulting function (if any)
|
||||
** in the top of the stack.
|
||||
*/
|
||||
static int loadline (lua_State *L) {
|
||||
int status;
|
||||
lua_settop(L, 0);
|
||||
if (!pushline(L, 1))
|
||||
return -1; /* no input */
|
||||
if ((status = addreturn(L)) != LUA_OK) /* 'return ...' did not work? */
|
||||
status = multiline(L); /* try as command, maybe with continuation lines */
|
||||
lua_remove(L, 1); /* remove line from the stack */
|
||||
lua_assert(lua_gettop(L) == 1);
|
||||
return status;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** Prints (calling the Lua 'print' function) any values on the stack
|
||||
*/
|
||||
static void l_print (lua_State *L) {
|
||||
int n = lua_gettop(L);
|
||||
if (n > 0) { /* any result to be printed? */
|
||||
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)));
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
** Do the REPL: repeatedly read (load) a line, evaluate (call) it, and
|
||||
** print any results.
|
||||
*/
|
||||
static void doREPL (lua_State *L) {
|
||||
int status;
|
||||
const char *oldprogname = progname;
|
||||
progname = NULL; /* no 'progname' on errors in interactive mode */
|
||||
lua_initreadline(L);
|
||||
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); /* clear stack */
|
||||
lua_writeline();
|
||||
progname = oldprogname;
|
||||
}
|
||||
|
||||
/* }================================================================== */
|
||||
|
||||
|
||||
/*
|
||||
** Main body of stand-alone interpreter (to be called in protected mode).
|
||||
** Reads the options and handles them all.
|
||||
*/
|
||||
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);
|
||||
int optlim = (script > 0) ? script : argc; /* first argv not an option */
|
||||
luaL_checkversion(L); /* check that interpreter has correct version */
|
||||
if (args == has_error) { /* bad arg? */
|
||||
print_usage(argv[script]); /* 'script' has index of bad arg. */
|
||||
return 0;
|
||||
}
|
||||
if (args & has_v) /* option '-v'? */
|
||||
print_version();
|
||||
if (args & has_E) { /* option '-E'? */
|
||||
lua_pushboolean(L, 1); /* signal for libraries to ignore env. vars. */
|
||||
lua_setfield(L, LUA_REGISTRYINDEX, "LUA_NOENV");
|
||||
}
|
||||
luaL_openlibs(L); /* open standard libraries */
|
||||
createargtable(L, argv, argc, script); /* create table 'arg' */
|
||||
lua_gc(L, LUA_GCRESTART); /* start GC... */
|
||||
lua_gc(L, LUA_GCGEN, 0, 0); /* ...in generational mode */
|
||||
if (!(args & has_E)) { /* no option '-E'? */
|
||||
if (handle_luainit(L) != LUA_OK) /* run LUA_INIT */
|
||||
return 0; /* error running LUA_INIT */
|
||||
}
|
||||
if (!runargs(L, argv, optlim)) /* execute arguments -e and -l */
|
||||
return 0; /* something failed */
|
||||
if (script > 0) { /* execute main script (if there is one) */
|
||||
if (handle_script(L, argv + script) != LUA_OK)
|
||||
return 0; /* interrupt in case of error */
|
||||
}
|
||||
if (args & has_i) /* -i option? */
|
||||
doREPL(L); /* do read-eval-print loop */
|
||||
else if (script < 1 && !(args & (has_e | has_v))) { /* no active option? */
|
||||
if (lua_stdin_is_tty()) { /* running in interactive mode? */
|
||||
print_version();
|
||||
doREPL(L); /* do read-eval-print loop */
|
||||
}
|
||||
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;
|
||||
}
|
||||
lua_gc(L, LUA_GCSTOP); /* stop GC while building state */
|
||||
lua_pushcfunction(L, &pmain); /* to call 'pmain' in protected mode */
|
||||
lua_pushinteger(L, argc); /* 1st argument */
|
||||
lua_pushlightuserdata(L, argv); /* 2nd argument */
|
||||
status = lua_pcall(L, 2, 1, 0); /* do the call */
|
||||
result = lua_toboolean(L, -1); /* get result */
|
||||
report(L, status);
|
||||
lua_close(L);
|
||||
return (result && status == LUA_OK) ? EXIT_SUCCESS : EXIT_FAILURE;
|
||||
}
|
||||
|
||||
Loading…
Reference in a new issue