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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Minios-devel] [UNIKRAFT/LIBLUA PATCH 2/3] Add Makefile.uk and main loop glue code
Hi Justin, please see inline.
On 02.09.19, 04:35, "Justin He (Arm Technology China)" <Justin.He@xxxxxxx>
wrote:
Hi Felipe
> -----Original Message-----
> From: Minios-devel <minios-devel-bounces@xxxxxxxxxxxxxxxxxxxx> On Behalf
> Of Felipe Huici
> Sent: 2019年8月28日 23:29
> To: minios-devel@xxxxxxxxxxxxx
> Cc: Felipe Huici <felipe.huici@xxxxxxxxx>; Simon Kuenzer
> <simon.kuenzer@xxxxxxxxx>
> Subject: [Minios-devel] [UNIKRAFT/LIBLUA PATCH 2/3] Add Makefile.uk and
> main loop glue code
>
> This is a port of lua to Unikraft as an external library. It requires
> libc, so in your application Makefile the library dependency list
> should read:
>
> LIBS := ...:$(UK_LIBS)/newlib:$(UK_LIBS)/lua:...
>
> Please refer to README.md for information on running it.
>
> Signed-off-by: Felipe Huici <felipe.huici@xxxxxxxxx>
> Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
> ---
> Makefile.uk | 100 ++++++++++
> lua.c | 620
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> ++
> 2 files changed, 720 insertions(+)
> create mode 100644 Makefile.uk
> create mode 100644 lua.c
>
> diff --git a/Makefile.uk b/Makefile.uk
> new file mode 100644
> index 0000000..bdb3093
> --- /dev/null
> +++ b/Makefile.uk
> @@ -0,0 +1,100 @@
> +#########################################################
> #######################
> +# Library registration
> +#########################################################
> #######################
> +$(eval $(call addlib_s,liblua,$(CONFIG_LIBLUA)))
> +
> +#########################################################
> #######################
> +# Sources
> +#########################################################
> #######################
> +LIBLUA_VERSION=5.3.5
> +LIBLUA_TARBALL=lua-$(LIBLUA_VERSION)
> +LIBLUA_URL=https://www.lua.org/ftp/$(LIBLUA_TARBALL).tar.gz
> +
> +$(eval $(call fetch,liblua,$(LIBLUA_URL)))
> +
> +#########################################################
> #######################
> +# Helpers
> +#########################################################
> #######################
> +LIBLUA_SRCS_BASE=$(LIBLUA_ORIGIN)/$(LIBLUA_TARBALL)/src
> +
> +#########################################################
> #######################
> +# Library includes
> +#########################################################
> #######################
> +# Put public headers of the library to a public folder and export them
> globally.
> +# The prepare step below takes care of populating the folder.
> +$(call mk_sub_build_dir,liblua/include)
> +CINCLUDES-$(CONFIG_LIBLUA) += -I$(LIBLUA_BUILD)/include
> +CPPINCLUDES-$(CONFIG_LIBLUA) += -I$(LIBLUA_BUILD)/include
> +
> +# Private headers
> +LIBLUA_CINCLUDES-y += -I$(LIBLUA_SRCS_BASE)
> +
> +#########################################################
> #######################
> +# Compilation unit
> +#########################################################
> #######################
> +LIBLUA_CFLAGS-y += -DLUA_COMPAT_5_2
> +
> +# Main loop
> +LIBLUA_SRCS-y += $(LIBLUA_BASE)/lua.c
> +
> +# CORE_O
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lapi.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lcode.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lctype.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/ldebug.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/ldo.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/ldump.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lfunc.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lgc.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/llex.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lmem.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lobject.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lopcodes.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lparser.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lstate.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lstring.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/ltable.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/ltm.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lundump.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lvm.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lzio.c
> +
> +# LIB_O
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lauxlib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lbaselib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lbitlib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lcorolib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/ldblib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/liolib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lmathlib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/loslib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lstrlib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/ltablib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/lutf8lib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/loadlib.c
> +LIBLUA_SRCS-y += $(LIBLUA_SRCS_BASE)/linit.c
> +
> +
> +#########################################################
> #######################
> +# libray API headers
> +#########################################################
> #######################
> +$(LIBLUA_SRCS_BASE)/%.h: $(LIBLUA_BUILD)/.origin
> + @# empty recipe to enforce dependency to archive extraction
> +
> +$(LIBLUA_BUILD)/include/%.h: $(LIBLUA_SRCS_BASE)/%.h
> + $(call build_cmd,LN,liblua,$@,\
> + ln -sf $< $@)
> +
> +$(LIBLUA_SRCS_BASE)/%.hpp: $(LIBLUA_BUILD)/.origin
> + @# empty recipe to enforce dependency to archive extraction
> +
> +$(LIBLUA_BUILD)/include/%.hpp: $(LIBLUA_SRCS_BASE)/%.hpp
> + $(call build_cmd,LN,liblua,$@,\
> + ln -sf $< $@)
> +
> +# TO_INC
> +UK_PREPARE += $(LIBLUA_BUILD)/include/lua.h
> +UK_PREPARE += $(LIBLUA_BUILD)/include/luaconf.h
> +UK_PREPARE += $(LIBLUA_BUILD)/include/lualib.h
> +UK_PREPARE += $(LIBLUA_BUILD)/include/lauxlib.h
> +UK_PREPARE += $(LIBLUA_BUILD)/include/lua.hpp
> diff --git a/lua.c b/lua.c
> new file mode 100644
> index 0000000..8f2f860
> --- /dev/null
> +++ b/lua.c
Looks like the standalone lua interpreter originates from
https://raw.githubusercontent.com/lua/lua/v5.3.5/lua.c
But I saw some tabs were changed into spaces, is that intentional?
IMO, it would be better if we changes less
> Yes, I used lua.c as basis, and no, that wasn't intentional. For a v2, I
> think a cleaner approach would be for me to provide the small modifcations to
> lua.c as a patch file under the library's patches directory. This should not
> only make the review easier since you'll be able to immediately see just the
> changes, but it would also simplify the process of upgrading to newer
> versions in the future.
-- Felipe
--
Cheers,
Justin (Jia He)
> @@ -0,0 +1,620 @@
> +/*
> +** $Id: lua.c,v 1.230.1.1 2017/04/19 17:29:57 roberto Exp $
> +** Lua stand-alone interpreter
> +** See Copyright Notice in lua.h
> +*/
> +
> +#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"
> +
> +#include <uk/plat/memory.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_VERSUFFIX
> +
> +
> +/*
> +** lua_stdin_is_tty detects whether the standard input is a 'tty' (that
> +** is, whether we're running lua interactively).
> +*/
> +#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>
> +#include <windows.h>
> +
> +#define lua_stdin_is_tty() _isatty(_fileno(stdin))
> +
> +#else /* }{ */
> +
> +/* ISO C definition */
> +#define lua_stdin_is_tty() 1 /* assume stdin is a tty */
> +
> +#endif /* } */
> +
> +#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_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), /* show prompt */ \
> + fgets(b, LUA_MAXINPUT, stdin) != NULL) /* get line */
> +#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;
> +
> +
> +/*
> +** Hook set by signal function to stop the interpreter.
> +*/
> +static void lstop (lua_State *L, lua_Debug *ar) {
> + (void)ar; /* unused arg. */
> + lua_sethook(L, NULL, 0, 0); /* reset hook */
> + luaL_error(L, "interrupted!");
> +}
> +
> +
> +/*
> +** Function to be called at a C signal. Because a C signal cannot
> +** just change a Lua state (as there is no proper synchronization),
> +** this function only sets a hook that, when called, will stop the
> +** interpreter.
> +*/
> +static void laction (int i) {
> + signal(i, SIG_DFL); /* if another SIGINT happens, terminate process */
> + 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' into global 'name'\n"
> + " -v show version information\n"
> + " -E ignore environment variables\n"
> + " -- stop handling options\n"
> + " - stop handling options and execute stdin\n"
> + ,
> + progname);
> +}
> +
> +
> +/*
> +** Prints an error message, adding the program name in front of it
> +** (if present)
> +*/
> +static void l_message (const char *pname, const char *msg) {
> + if (pname) lua_writestringerror("%s: ", pname);
> + lua_writestringerror("%s\n", msg);
> +}
> +
> +
> +/*
> +** Check whether 'status' is not OK and, if so, prints the error
> +** message on the top of the stack. It assumes that the error object
> +** is a string, as it was either generated by Lua or by 'msghandler'.
> +*/
> +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); /* remove message */
> + }
> + return status;
> +}
> +
> +
> +/*
> +** Message handler used to run all chunks
> +*/
> +static int msghandler (lua_State *L) {
> + const char *msg = lua_tostring(L, 1);
> + if (msg == NULL) { /* is error object not a string? */
> + if (luaL_callmeta(L, 1, "__tostring") && /* does it have a
metamethod
> */
> + lua_type(L, -1) == LUA_TSTRING) /* that produces a string? */
> + return 1; /* that is the message */
> + else
> + msg = lua_pushfstring(L, "(error object is a %s value)",
> + luaL_typename(L, 1));
> + }
> + luaL_traceback(L, L, msg, 1); /* append a standard traceback */
> + return 1; /* return the traceback */
> +}
> +
> +
> +/*
> +** Interface to 'lua_pcall', which sets appropriate message function
> +** and C-signal handler. Used to run all chunks.
> +*/
> +static int docall (lua_State *L, int narg, int nres) {
> + int status;
> + int base = lua_gettop(L) - narg; /* function index */
> + lua_pushcfunction(L, msghandler); /* push message handler */
> + lua_insert(L, base); /* put it under function and args */
> + globalL = L; /* to be available to 'laction' */
> + signal(SIGINT, laction); /* set C-signal handler */
> + status = lua_pcall(L, narg, nres, base);
> + signal(SIGINT, SIG_DFL); /* reset C-signal handler */
> + lua_remove(L, base); /* remove message handler from the stack */
> + return status;
> +}
> +
> +
> +static void print_version (void) {
> + lua_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
> + lua_writeline();
> +}
> +
> +
> +/*
> +** Create the 'arg' table, which stores all arguments from the
> +** command line ('argv'). It should be aligned so that, at index 0,
> +** it has 'argv[script]', which is the script name. The arguments
> +** to the script (everything after 'script') go to positive indices;
> +** other arguments (before the script name) go to negative indices.
> +** If there is no script name, assume interpreter's name as base.
> +*/
> +static void createargtable (lua_State *L, char **argv, int argc, int
script) {
> + int i, narg;
> + if (script == argc) script = 0; /* no script name? */
> + narg = argc - (script + 1); /* number of positive indices */
> + 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));
> +}
> +
> +
> +/*
> +** Calls 'require(name)' and stores the result in a global variable
> +** with the given 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); /* call 'require(name)' */
> + if (status == LUA_OK)
> + lua_setglobal(L, name); /* global[name] = require return */
> + return report(L, status);
> +}
> +
> +
> +/*
> +** Returns the string to be used as a prompt by the interpreter.
> +*/
> +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;
> +}
> +
> +/* mark in error messages for incomplete statements */
> +#define EOFMARK "<eof>"
> +#define marklen (sizeof(EOFMARK)/sizeof(char) - 1)
> +
> +
> +/*
> +** Check whether 'status' signals a syntax error and the error
> +** message at the top of the stack ends with the above mark for
> +** incomplete statements.
> +*/
> +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 */
> + 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;
> +}
> +
> +
> +/*
> +** Push on the stack the contents of table 'arg' from 1 to #arg
> +*/
> +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); /* remove table from the stack */
> + 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; /* stdin */
> + status = luaL_loadfile(L, fname);
> + if (status == LUA_OK) {
> + int n = pushargs(L); /* push arguments to script */
> + status = docall(L, n, LUA_MULTRET);
> + }
> + return report(L, status);
> +}
> +
> +
> +
> +/* bits of various argument indicators in 'args' */
> +#define has_error 1 /* bad option */
> +#define has_i 2 /* -i */
> +#define has_v 4 /* -v */
> +#define has_e 8 /* -e */
> +#define has_E 16 /* -E */
> +
> +/*
> +** Traverses all arguments from 'argv', returning a mask with those
> +** needed before running any Lua code (or an error code if it finds
> +** any invalid argument). 'first' returns the first not-handled argument
> +** (either the script name or a bad argument in case of error).
> +*/
> +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] != '-') /* not an option? */
> + return args; /* stop handling options */
> + switch (argv[i][1]) { /* else check option */
> + case '-': /* '--' */
> + if (argv[i][2] != '\0') /* extra characters after '--'? */
> + return has_error; /* invalid option */
> + *first = i + 1;
> + return args;
> + case '\0': /* '-' */
> + return args; /* script "name" is '-' */
> + case 'E':
> + if (argv[i][2] != '\0') /* extra characters after 1st? */
> + return has_error; /* invalid option */
> + args |= has_E;
> + break;
> + case 'i':
> + args |= has_i; /* (-i implies -v) *//* FALLTHROUGH */
> + case 'v':
> + if (argv[i][2] != '\0') /* extra characters after 1st? */
> + return has_error; /* invalid option */
> + args |= has_v;
> + break;
> + case 'e':
> + args |= has_e; /* FALLTHROUGH */
> + 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 has_error; /* no next argument or it is another
option */
> + }
> + break;
> + default: /* invalid option */
> + return has_error;
> + }
> + }
> + *first = i; /* no script name */
> + return args;
> +}
> +
> +
> +/*
> +** Processes options 'e' and 'l', which involve running Lua code.
> +** Returns 0 if some code raises an error.
> +*/
> +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] == '-'); /* already checked */
> + if (option == 'e' || option == 'l') {
> + int status;
> + const char *extra = argv[i] + 2; /* both options need an argument
*/
> + 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); /* try alternative name */
> + }
> + if (init == NULL) return LUA_OK;
> + else if (init[0] == '@')
> + return dofile(L, init+1);
> + else
> + return dostring(L, init, name);
> +}
> +
> +
> +/*
> +** 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;
> + struct ukplat_memregion_desc img;
> + char *cstr;
> +
> + int args = collectargs(argv, &script);
> + luaL_checkversion(L); /* check that interpreter has correct version */
> + if (argv[0] && argv[0][0]) progname = argv[0];
> + 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' */
> + 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, script)) /* execute arguments -e and -l */
> + return 0; /* something failed */
> + if (script < argc && /* execute main script (if there is one) */
> + handle_script(L, argv + script) != LUA_OK)
> + return 0;
> + if (args & has_i) /* -i option? */
> + doREPL(L); /* do read-eval-print loop */
> + /* see if script is available from initrd */
> + else if (ukplat_memregion_find_initrd0(&img) >= 0) {
> + cstr = (char *)img.base;
> + dostring(L, cstr, "initrd");
> + }
> + else if (script == argc && !(args & (has_e | has_v))) { /* no
arguments?
> */
> + 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 lua_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_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;
> +}
> +
> --
> 2.11.0
>
>
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