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-rw-r--r--src/sysbin/bam.lua1
-rw-r--r--src/sysbin/login/main.c2
-rw-r--r--src/sysbin/lx/main.c438
3 files changed, 440 insertions, 1 deletions
diff --git a/src/sysbin/bam.lua b/src/sysbin/bam.lua
index c05d8e6..7c2351b 100644
--- a/src/sysbin/bam.lua
+++ b/src/sysbin/bam.lua
@@ -23,5 +23,6 @@ return function(s, lib)
sysbin_exe('lua', {lib.liblua}),
-- sysbin_exe('luac', {liblua}),
+ sysbin_exe('lx', {lib.liblua}),
}
end
diff --git a/src/sysbin/login/main.c b/src/sysbin/login/main.c
index 2f75dbe..6b15fe0 100644
--- a/src/sysbin/login/main.c
+++ b/src/sysbin/login/main.c
@@ -42,7 +42,7 @@ int main(int argc, char **argv) {
if (!ok) PANIC("[login] Could not bind to shell process.");
// ok = sc_proc_exec(shell_pid, "sys:/bin/shell.bin");
- ok = sc_proc_exec(shell_pid, "sys:/bin/lua.bin");
+ ok = sc_proc_exec(shell_pid, "sys:/bin/lx.bin");
if (!ok) PANIC("[login] Could not run shell.bin");
proc_status_t s;
diff --git a/src/sysbin/lx/main.c b/src/sysbin/lx/main.c
new file mode 100644
index 0000000..ecfecd8
--- /dev/null
+++ b/src/sysbin/lx/main.c
@@ -0,0 +1,438 @@
+/*
+** lx: Lua Extended, based on the Lua stand-alone interpreter
+*/
+
+#define lua_c
+
+#include <lua/lprefix.h>
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <lua/lua.h>
+
+#include <lua/lauxlib.h>
+#include <lua/lualib.h>
+
+
+#define LUA_PROMPT "> "
+#define LUA_PROMPT2 ">> "
+
+#define LUA_PROGNAME "lx"
+
+#define LUA_MAXINPUT 512
+
+#define LUA_INIT_VAR "LUA_INIT"
+#define LUA_INITVARVERSION \
+ LUA_INIT_VAR "_" LUA_VERSION_MAJOR "_" LUA_VERSION_MINOR
+#define LUA_INITSTR "require 'lx.lxinit'"
+
+
+/*
+** 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>
+#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.
+*/
+#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))
+
+
+
+
+lua_State *globalL = NULL;
+
+const char *progname = LUA_PROGNAME;
+
+
+/*
+** Hook set by signal function to stop the interpreter.
+*/
+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.
+*/
+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);
+}
+
+
+
+/*
+** Prints an error message, adding the program name in front of it
+** (if present)
+*/
+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'.
+*/
+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
+*/
+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.
+*/
+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;
+}
+
+
+void print_version (void) {
+ lua_writestring(LUA_COPYRIGHT, strlen(LUA_COPYRIGHT));
+ lua_writeline();
+}
+
+
+
+int dochunk (lua_State *L, int status) {
+ if (status == LUA_OK) status = docall(L, 0, 0);
+ return report(L, status);
+}
+
+
+int dofile (lua_State *L, const char *name) {
+ return dochunk(L, luaL_loadfile(L, name));
+}
+
+
+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.
+*/
+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.
+*/
+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.
+*/
+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.
+*/
+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).
+*/
+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
+*/
+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.
+*/
+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
+*/
+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.
+*/
+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
+*/
+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;
+}
+
+
+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);
+}
+
+
+
+int handle_luainit (lua_State *L) {
+ const char *name = "=" LUA_INITVARVERSION;
+ const char *init = LUA_INITSTR;
+
+ return dostring(L, init, name);
+}
+
+
+/*
+** Main body of stand-alone interpreter (to be called in protected mode).
+** Reads the options and handles them all.
+*/
+int pmain (lua_State *L) {
+ int status;
+ luaL_checkversion(L); /* check that interpreter has correct version */
+
+ print_version();
+
+ luaL_openlibs(L); /* open standard libraries */
+
+ if (handle_luainit(L) != LUA_OK) /* run LUA_INIT */
+ return 0; /* error running LUA_INIT */
+
+ lua_getglobal(L, "require");
+ lua_pushstring(L, "main");
+ status = docall(L, 1, 1); /* call 'require("main")' */
+ if (status != LUA_OK) {
+ // no main, launch a REPL
+ 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_pushcfunction(L, &pmain); /* to call 'pmain' in protected mode */
+ status = lua_pcall(L, 0, 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;
+}
+
+/* vim: set sts=2 ts=2 sw=2 tw=0 et :*/
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 18:52:31 +0000