//////////////////////////////////////////////////////////////////////////
// BBS-Lua Project
//
// Author: Hung-Te Lin(piaip), Jan. 2008. 
// <piaip@csie.ntu.edu.tw>
// This source is released in MIT License, same as Lua 5.0
// http://www.lua.org/license.html
//
// TODO:
//  BBSLUA 1.0
//  1. add quick key/val conversion [deprecated]
//  2. add key values (UP/DOWN/...) [done]
//  3. remove i/o libraries [done]
//  4. add system break key (Ctrl-C) [done]
//  5. add version string and script tags
//  6. add digital signature
//  7. standalone w32 sdk
//  8. syntax highlight in editor
//  9. deal with loadfile, dofile
//  10.provide local storage
//  11.modify bbs user data (eg, money)
//  12.os.date(), os.exit(), abort(), os.time()
//  13.memory free issue in C library level?
//
//  BBSLUA 2.0
//  1. 2 people communication
//  
//  BBSLUA 3.0
//  1. n people communication
//////////////////////////////////////////////////////////////////////////

#include "bbs.h"

#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>

//////////////////////////////////////////////////////////////////////////
// CONST DEFINITION
//////////////////////////////////////////////////////////////////////////

#define BBSLUA_INTERFACE_VER    (0.113)
#define BBSLUA_SIGNATURE        "--#BBSLUA"

// BBS-Lua script format:
// $BBSLUA_SIGNATURE
// -- Interface: $interface
// -- Title: $title
// -- Notes: $notes
// -- Author: $author <email@domain>
// -- Version: $version
// -- Date: $date
// -- X-Category: $category
//  [... script ...]
// $BBSLUA_SIGNATURE

//////////////////////////////////////////////////////////////////////////
// CONFIGURATION VARIABLES
//////////////////////////////////////////////////////////////////////////
#define BLAPI_PROTO     int

#define BLCONF_BREAK_KEY    Ctrl('C')
#define BLCONF_EXEC_COUNT   (5000)
#define BLCONF_PEEK_TIME    (0.01)
#define BLCONF_KBHIT_TMIN   (0.05f)
#define BLCONF_KBHIT_TMAX   (60*10)
#define BLCONF_SLEEP_TMIN   (BLCONF_PEEK_TIME)
#define BLCONF_SLEEP_TMAX   (BLCONF_KBHIT_TMAX)
#define BLCONF_U_SECOND     (1000000L)

//////////////////////////////////////////////////////////////////////////
// GLOBAL VARIABLES
//////////////////////////////////////////////////////////////////////////
static int abortBBSLua   = 0;
static int runningBBSLua = 0; // prevent re-entrant

//////////////////////////////////////////////////////////////////////////
// UTILITIES
//////////////////////////////////////////////////////////////////////////

static void
bl_double2tv(double d, struct timeval *tv)
{
    tv->tv_sec = d;
    tv->tv_usec = (d - tv->tv_sec) * BLCONF_U_SECOND;
}

static double
bl_tv2double(const struct timeval *tv)
{
    double d = tv->tv_sec;
    d += tv->tv_usec / (double)BLCONF_U_SECOND;
    return d;
}

void
bl_k2s(lua_State* L, int v)
{
    if (v <= 0)
        lua_pushnil(L);
    else if (v == KEY_TAB)
        lua_pushstring(L, "TAB");
    else if (v == '\b' || v == 0x7F)
        lua_pushstring(L, "BS");
    else if (v == '\n' || v == '\r' || v == Ctrl('M'))
        lua_pushstring(L, "ENTER");
    else if (v < ' ')
        lua_pushfstring(L, "^%c", v-1+'A');
    else if (v < 0x100)
        lua_pushfstring(L, "%c", v);
    else if (v >= KEY_F1 && v <= KEY_F12)
        lua_pushfstring(L, "F%d", v - KEY_F1 +1);
    else switch(v)
    {
        case KEY_UP:    lua_pushstring(L, "UP");    break;
        case KEY_DOWN:  lua_pushstring(L, "DOWN");  break;
        case KEY_RIGHT: lua_pushstring(L, "RIGHT"); break;
        case KEY_LEFT:  lua_pushstring(L, "LEFT");  break;
        case KEY_HOME:  lua_pushstring(L, "HOME");  break;
        case KEY_END:   lua_pushstring(L, "END");   break;
        case KEY_INS:   lua_pushstring(L, "INS");   break;
        case KEY_DEL:   lua_pushstring(L, "DEL");   break;
        case KEY_PGUP:  lua_pushstring(L, "PGUP");  break;
        case KEY_PGDN:  lua_pushstring(L, "PGDN");  break;
        default:        lua_pushnil(L);             break;
    }
}

BLAPI_PROTO
bl_newwin(int rows, int cols, const char *title)
{
    // input: (rows, cols, title)
    int y = 0, x = 0, n = 0;
    int oy = 0, ox = 0;

    if (rows <= 0 || cols <= 0)
        return 0;

    getyx(&oy, &ox);
    // now, draw the box
    newwin(rows, cols, oy, ox);

    if (!title || !*title)
        return 0;

    // draw center-ed title
    n = strlen_noansi(title);
    x = ox + (cols - n)/2;
    y = oy + (rows)/2;
    move(y, x);
    outs(title);

    move(oy, ox);
    return 0;
}

//////////////////////////////////////////////////////////////////////////
// BBSLUA API IMPLEMENTATION
//////////////////////////////////////////////////////////////////////////

BLAPI_PROTO
bl_getyx(lua_State* L)
{
    int y, x;
    getyx(&y, &x);
    lua_pushinteger(L, y);
    lua_pushinteger(L, x);
    return 2;
}

BLAPI_PROTO
bl_getmaxyx(lua_State* L)
{
    lua_pushinteger(L, t_lines);
    lua_pushinteger(L, t_columns);
    return 2;
}

BLAPI_PROTO
bl_move(lua_State* L)
{
    int n = lua_gettop(L);
    int y = 0, x = 0;
    if (n > 0)
        y = lua_tointeger(L, 1);
    if (n > 1)
        x = lua_tointeger(L, 2);
    move_ansi(y, x);
    return 0;
}

BLAPI_PROTO
bl_moverel(lua_State* L)
{
    int n = lua_gettop(L);
    int y = 0, x = 0;
    getyx(&y, &x);
    if (n > 0)
        y += lua_tointeger(L, 1);
    if (n > 1)
        x += lua_tointeger(L, 2);
    move(y, x);
    getyx(&y, &x);
    lua_pushinteger(L, y);
    lua_pushinteger(L, x);
    return 2;
}

BLAPI_PROTO
bl_clear(lua_State* L)
{
    clear();
    return 0;
}

BLAPI_PROTO
bl_clrtoeol(lua_State* L)
{
    clrtoeol();
    return 0;
}

BLAPI_PROTO
bl_clrtobot(lua_State* L)
{
    clrtobot();
    return 0;
}

BLAPI_PROTO
bl_refresh(lua_State* L)
{
    // refresh();
    // Seems like that most people don't understand the relationship
    // between refresh() and input queue, so let's force update here.
    doupdate();
    return 0;
}

BLAPI_PROTO
bl_addstr(lua_State* L)
{
    int n = lua_gettop(L);
    int i = 1;
    for (i = 1; i <= n; i++)
    {
        const char *s = lua_tostring(L, i);
        if(s)
            outs(s);
    }
    return 0;
}

BLAPI_PROTO
bl_box(lua_State *L)
{
    // input: (rows, cols, title)
    int rows = 1, cols = 1;
    int n = lua_gettop(L);
    const char *title = NULL;

    if (n > 0)
        rows = lua_tonumber(L, 1);
    if (n > 1)
        cols = lua_tonumber(L, 2);
    if (n > 2)
        title = lua_tostring(L, 3);
    if (rows <= 0 || cols <= 0)
        return 0;

    // now, draw the box
    bl_newwin(rows, cols, title);
    return 0;
}

BLAPI_PROTO
bl_print(lua_State* L)
{
    bl_addstr(L);
    outc('\n');
    return 0;
}

BLAPI_PROTO
bl_getch(lua_State* L)
{
    int c = igetch();
    if (c == BLCONF_BREAK_KEY)
    {
        drop_input();
        abortBBSLua = 1;
        return lua_yield(L, 0);
    }
    bl_k2s(L, c);
    return 1;
}


BLAPI_PROTO
bl_getstr(lua_State* L)
{
    int y, x;
    char buf[PATHLEN] = "";
    int len = 2, echo = 1;
    int n = lua_gettop(L);

    if (n > 0)
        len = lua_tointeger(L, 1);
    if (n > 1)
        echo = lua_tointeger(L, 2);

    if (len < 2)
        len = 2;
    if (len >= sizeof(buf))
        len = sizeof(buf)-1;

    // TODO process Ctrl-C here
    getyx(&y, &x);
    len = getdata(y, x, NULL, buf, len, echo);
    if (len)
        lua_pushstring(L, buf);
    return len ? 1 : 0;
}

BLAPI_PROTO
bl_kbhit(lua_State *L)
{
    int n = lua_gettop(L);
    double f = 0.1f;
    
    if (n > 0)
        f = (double)lua_tonumber(L, 1);

    if (f < BLCONF_KBHIT_TMIN) f = BLCONF_KBHIT_TMIN;
    if (f > BLCONF_KBHIT_TMAX) f = BLCONF_KBHIT_TMAX;

    refresh();
    if (num_in_buf() || wait_input(f, 0))
        lua_pushboolean(L, 1);
    else
        lua_pushboolean(L, 0);
    return 1;
}

BLAPI_PROTO
bl_kbreset(lua_State *L)
{
    // peek input queue first!
    if (peek_input(BLCONF_PEEK_TIME, BLCONF_BREAK_KEY))
    {
        drop_input();
        abortBBSLua = 1;
        return lua_yield(L, 0);
    }

    drop_input();
    return 0;
}

BLAPI_PROTO
bl_sleep(lua_State *L)
{
    int n = lua_gettop(L);
    double us = 0, nus = 0;
    struct timeval tp, tdest;
    struct timezone tz;

    if (n > 0)
        us = lua_tonumber(L, 1);
    if (us < BLCONF_SLEEP_TMIN)
        us = BLCONF_SLEEP_TMIN;
    if (us > BLCONF_SLEEP_TMAX)
        us = BLCONF_SLEEP_TMAX;
    nus = us;

    refresh();
    memset(&tz, 0, sizeof(tz));
    gettimeofday(&tp, &tz);

    // nus is the destination time
    nus = bl_tv2double(&tp) + us;
    bl_double2tv(nus, &tdest);

    // use peek_input
    while ( (tp.tv_sec < tdest.tv_sec) ||
            ((tp.tv_sec == tdest.tv_sec) && (tp.tv_usec < tdest.tv_usec)))
    {
        // calculate new peek time
        us = nus - bl_tv2double(&tp);

        // check if input key is system break key.
        if (peek_input(us, BLCONF_BREAK_KEY))
        {
            drop_input();
            abortBBSLua = 1;
            return lua_yield(L, 0);
        }

        // check time
        gettimeofday(&tp, &tz);
    }

    return 0;
}


BLAPI_PROTO
bl_pause(lua_State* L)
{
    int n = lua_gettop(L);
    const char *s = NULL;
    if (n > 0)
        s = lua_tostring(L, 1);

    n = vmsg(s);
    if (n == BLCONF_BREAK_KEY)
    {
        drop_input();
        abortBBSLua = 1;
        return lua_yield(L, 0);
    }
    bl_k2s(L, n);
    return 1;
}

BLAPI_PROTO
bl_title(lua_State* L)
{
    int n = lua_gettop(L);
    const char *s = NULL;
    if (n > 0)
        s = lua_tostring(L, 1);
    if (s == NULL)
        return 0;

    stand_title(s);
    return 0;
}

BLAPI_PROTO
bl_ansi_color(lua_State *L)
{
    char buf[PATHLEN] = ESC_STR "[";
    char *p = buf + strlen(buf);
    int i = 1;
    int n = lua_gettop(L);
    if (n >= 10) n = 10;
    for (i = 1; i <= n; i++)
    {
        if (i > 1) *p++ = ';';
        sprintf(p, "%d", (int)lua_tointeger(L, i));
        p += strlen(p);
    }
    *p++ = 'm';
    *p   = 0;
    lua_pushstring(L, buf);
    return 1;
}

BLAPI_PROTO
bl_attrset(lua_State *L)
{
    char buf[PATHLEN] = ESC_STR "[";
    char *p = buf + strlen(buf);
    int i = 1;
    int n = lua_gettop(L);
    if (n == 0)
        outs(ANSI_RESET);
    for (i = 1; i <= n; i++)
    {
        sprintf(p, "%dm",(int)lua_tointeger(L, i)); 
        outs(buf);
    }
    return 0;
}

BLAPI_PROTO
bl_time(lua_State *L)
{
    syncnow();
    lua_pushinteger(L, now);
    return 1;
}

BLAPI_PROTO
bl_ctime(lua_State *L)
{
    syncnow();
    lua_pushstring(L, ctime4(&now));
    return 1;
}

BLAPI_PROTO
bl_clock(lua_State *L)
{
    struct timeval tp;
    struct timezone tz;
    double d = 0;
    memset(&tz, 0, sizeof(tz));
    gettimeofday(&tp, &tz);
    d = bl_tv2double(&tp);
    lua_pushnumber(L, d);
    return 1;
}

BLAPI_PROTO
bl_userid(lua_State *L)
{
    lua_pushstring(L, cuser.userid);
    return 1;
}

//////////////////////////////////////////////////////////////////////////
// BBSLUA LIBRARY
//////////////////////////////////////////////////////////////////////////

static const struct luaL_reg lib_bbslua [] = {
    /* curses output */
    { "getyx",      bl_getyx },
    { "getmaxyx",   bl_getmaxyx },
    { "move",       bl_move },
    { "moverel",    bl_moverel },
    { "clear",      bl_clear },
    { "clrtoeol",   bl_clrtoeol },
    { "clrtobot",   bl_clrtobot },
    { "refresh",    bl_refresh },
    { "addstr",     bl_addstr },
    { "outs",       bl_addstr },
    { "print",      bl_print },
    /* input */
    { "getch",      bl_getch },
    { "getdata",    bl_getstr },
    { "getstr",     bl_getstr },
    { "kbhit",      bl_kbhit },
    { "kbreset",    bl_kbreset },
    /* advanced output */
    { "box",        bl_box },
    /* BBS utilities */
    { "pause",      bl_pause },
    { "title",      bl_title },
    { "userid",     bl_userid },
    /* time */
    { "time",       bl_time },
    { "now",        bl_time },
    { "clock",      bl_clock },
    { "ctime",      bl_ctime },
    { "sleep",      bl_sleep },
    /* ANSI helpers */
    { "ANSI_COLOR", bl_ansi_color },
    { "color",      bl_attrset },
    { "attrset",    bl_attrset },
    { NULL, NULL},
};

// non-standard modules in bbsluaext.c
LUALIB_API int luaopen_bit (lua_State *L);

static const luaL_Reg bbslualibs[] = {
  // standard modules
  {"", luaopen_base},

  // {LUA_LOADLIBNAME, luaopen_package},
  {LUA_TABLIBNAME, luaopen_table},
  // {LUA_IOLIBNAME, luaopen_io},
  // {LUA_OSLIBNAME, luaopen_os},
  {LUA_STRLIBNAME, luaopen_string},
  {LUA_MATHLIBNAME, luaopen_math},
  // {LUA_DBLIBNAME, luaopen_debug},
  
  // bbslua-ext modules
  {"bit", luaopen_bit},

  {NULL, NULL}
};


LUALIB_API void bbsluaL_openlibs (lua_State *L) {
  const luaL_Reg *lib = bbslualibs;
  for (; lib->func; lib++) {
    lua_pushcfunction(L, lib->func);
    lua_pushstring(L, lib->name);
    lua_call(L, 1, 0);
  }
}


// Constant registration

typedef struct bbsluaL_RegStr {
  const char *name;
  const char *val;
} bbsluaL_RegStr;

typedef struct bbsluaL_RegNum {
  const char *name;
  lua_Number val;
} bbsluaL_RegNum;

static const bbsluaL_RegStr bbsluaStrs[] = {
    {"ESC",         ESC_STR},
    {"ANSI_RESET",  ANSI_RESET},
    {"sitename"     BBSNAME},
    {NULL,          NULL},
};

static const  bbsluaL_RegNum bbsluaNums[] = {
    {"interface",   BBSLUA_INTERFACE_VER},
    {NULL,          0},
};

static void
bbsluaRegConst(lua_State *L, const char *globName)
{
    int i = 0;

    // section
    lua_getglobal(L, globName);

    for (i = 0; bbsluaStrs[i].name; i++)
    {
        lua_pushstring(L, bbsluaStrs[i].val);
        lua_setfield(L, -3, bbsluaStrs[i].name);
    }

    for (i = 0; bbsluaNums[i].name; i++)
    {
        lua_pushnumber(L, bbsluaNums[i].val);
        lua_setfield(L, -3, bbsluaNums[i].name);
    }
    lua_pop(L, 1);

    // global
    lua_pushcfunction(L, bl_print);
    lua_setglobal(L, "print");
}

static void
bbsluaHook(lua_State *L, lua_Debug* ar)
{
    // vmsg("bbslua HOOK!");
    if (abortBBSLua)
    {
        drop_input();
        lua_yield(L, 0);
        return;
    }

    if (ar->event != LUA_HOOKCOUNT)
        return;

    // now, peek and check
    if (input_isfull())
        drop_input();

    // refresh();
    
    // check if input key is system break key.
    if (peek_input(BLCONF_PEEK_TIME, BLCONF_BREAK_KEY))
    {
        drop_input();
        abortBBSLua = 1;
        lua_yield(L, 0);
        return;
    }
}

static char * 
bbslua_attach(const char *fpath, int *plen)
{
    struct stat st;
    int fd = open(fpath, O_RDONLY, 0600);
    char *buf = NULL;

    *plen = 0;

    if (fd < 0) return buf;
    if (fstat(fd, &st) || ((*plen = st.st_size) < 1) || S_ISDIR(st.st_mode))
    {
        close(fd);
        return buf;
    }
    *plen = *plen +1;

    buf = mmap(NULL, *plen, PROT_READ, MAP_SHARED, fd, 0);
    close(fd);

    if (buf == NULL || buf == MAP_FAILED) 
    {
        *plen = 0;
        return  NULL;
    }

    madvise(buf, *plen, MADV_SEQUENTIAL);
    return buf;
}

static void
bbslua_detach(char *p, int len)
{
    munmap(p, len);
}

int
bbslua_isHeader(const char *ps, const char *pe)
{
    int szsig = strlen(BBSLUA_SIGNATURE);
    if (ps + szsig > pe)
        return 0;
    if (strncmp(ps, BBSLUA_SIGNATURE, szsig) == 0)
        return 1;
    return 0;
}

static int
bbslua_detect_range(char **pbs, char **pbe)
{
    int szsig = strlen(BBSLUA_SIGNATURE);
    char *bs, *be, *ps, *pe;

    bs = ps = *pbs;
    be = pe = *pbe;

    // find start
    while (ps + szsig < pe)
    {
        if (strncmp(ps, BBSLUA_SIGNATURE, szsig) == 0)
            break;
        // else, skip to next line
        while (ps + szsig < pe && *ps++ != '\n');
    }

    if (!(ps + szsig < pe))
        return 0;

    *pbs = ps;
    *pbe = be;

    // find tail by SIGNATURE
    pe = ps + 1;
    while (pe + szsig < be)
    {
        if (strncmp(pe, BBSLUA_SIGNATURE, szsig) == 0)
            break;
        // else, skip to next line
        while (pe + szsig < be && *pe++ != '\n');
    }

    if (pe + szsig < be)
    {
        // found sig, end at such line.
        pe--;
        *pbe = pe;
    } else {
        // abort.
        *pbe = NULL;
        *pbs = NULL;
        return 0;
    }

    // prevent trailing zeros
    pe = *pbe;
    while (pe > ps && !*pe)
        pe--;
    *pbe = pe;

    return 1;
}

static const char *bbsluaTocTags[] =
{
    "interface",
    "title",
    "notes",
    "author",
    "version",
    "date",
    NULL
};

static const char *bbsluaTocPrompts[] = 
{
    "界面",
    "名稱",
    "說明",
    "作者",
    "版本",
    "日期",
    NULL
};

int
bbslua_load_TOC(lua_State *L, const char *pbs, const char *pbe)
{
    unsigned char *ps = NULL, *pe = NULL;
    int i = 0;

    lua_newtable(L);

    while (pbs < pbe)
    {
        // find stripped line start, end
        ps = pe = (unsigned char *) pbs;
        while (pe < (unsigned char*)pbe && *pe != '\n' && *pe != '\r')
            pe ++;
        pbs = (char*)pe+1;
        while (ps < pe && *ps <= ' ') ps++;
        while (pe > ps && *(pe-1) <= ' ') pe--;
        // at least "--"
        if (pe < ps+2)
            break;
        if (*ps++ != '-' || *ps++ != '-')
            break;
        while (ps < pe && *ps <= ' ') ps++;
        // empty entry?
        if (ps >= pe)
            continue;
        // find pattern
        for (i = 0; bbsluaTocTags[i]; i++)
        {
            int l = strlen(bbsluaTocTags[i]);
            if (ps + l > pe)
                continue;
            if (strncasecmp((char*)ps, bbsluaTocTags[i], l) != 0)
                continue;
            ps += l;
            // found matching pattern, now find value
            while (ps < pe && *ps <= ' ') ps++;
            if (ps >= pe || *ps++ != ':') 
                break;
            while (ps < pe && *ps <= ' ') ps++;
            // finally, (ps, pe) is the value!
            if (ps >= pe)
                break;

            lua_pushlstring(L, (char*)ps, pe-ps);

            // accept only real floats for interface ([0])
            if (i == 0 && lua_tonumber(L, -1) <= 0)
            {
                lua_pop(L, 1);
            }
            else
            {
                lua_setfield(L, -2, bbsluaTocTags[i]);
            }
            break;
        }
    }

    lua_setglobal(L, "toc");
    return 0;
}

void
bbslua_logo(lua_State *L)
{
    int y, by = b_lines -1; // print - back from bottom
    int i = 0;
    double tocinterface = 0;
    int tocs = 0;

    // get toc information
    lua_getglobal(L, "toc");
    lua_getfield(L, -1, bbsluaTocTags[0]);
    tocinterface = lua_tonumber(L, -1); lua_pop(L, 1);

    for (i = 1; bbsluaTocTags[i]; i++)
    {
        lua_getfield(L, -1, bbsluaTocTags[i]);
        if (lua_tostring(L, -1))
            tocs++;
        lua_pop(L, 1);
    }

    // prepare logo window
    grayout(0, b_lines, GRAYOUT_DARK);
    outs(ANSI_COLOR(30;47));

    // print compatibility test
    // now (by) is the base of new information
    if (tocinterface == 0)
    {
        by -= 4; y = by+2;
        outs(ANSI_COLOR(0;31;47));
        move(y-1, 0); bl_newwin(4, t_columns-1, NULL);
        move(y, 0);
        outs(" ▲此程式缺少相容性資訊，您可能無法正常執行");
        move(++y, 0);
        outs(" 若執行出現錯誤，請向原作者取得新版");
    } 
    else if (tocinterface > BBSLUA_INTERFACE_VER)
    {
        by -= 4; y = by+2;
        outs(ANSI_COLOR(0;1;37;41));
        move(y-1, 0); bl_newwin(4, t_columns-1, NULL);
        move(y, 0);
        prints(" ▲此程式使用新版的 BBS-Lua 規格 (%0.3f)，您可能無法正常執行",
                tocinterface);
        move(++y, 0);
        outs(" 若執行出現錯誤，建議您重新登入 BBS 後再重試");
    }
    else if (tocinterface == BBSLUA_INTERFACE_VER)
    {
        // do nothing!
    } 
    else 
    {
        // should be comtaible
        // prints("相容 (%.03f)", tocinterface);
    }


    // print toc, ifany.
    if (tocs)
    {
        y = by - 1 - tocs;
        by = y-1;
        outs(ANSI_COLOR(0;1;30;47));
        move(y, 0);
        bl_newwin(tocs+2, t_columns-1, NULL);
        // now try to print all TOC infos
        for (i = 1; bbsluaTocTags[i]; i++)
        {
            lua_getfield(L, -1, bbsluaTocTags[i]);
            if (!lua_isstring(L, -1))
            {
                lua_pop(L, 1);
                continue;
            }
            move(++y, 2); 
            outs(bbsluaTocPrompts[i]);
            outs(": ");
            outns(lua_tostring(L, -1), t_columns-10); 
            lua_pop(L, 1);
        }
    }
    outs(ANSI_COLOR(0;1;37;44));
    move(by-2, 0); outc('\n');
    bl_newwin(2, t_columns-1, NULL);
    prints("■ BBS-Lua %.03f  (Build " __DATE__ " " __TIME__") ",
            (double)BBSLUA_INTERFACE_VER);
    move(by, 0);
    outs(ANSI_COLOR(22;37) "   提醒您執行中隨時可按 "
            ANSI_COLOR(1;31) "[Ctrl-C] " ANSI_COLOR(0;37;44) 
            "強制中斷 BBS-Lua 程式");
    outs(ANSI_RESET);
    lua_pop(L, 1);
}

int
bbslua(const char *fpath)
{
    int r = 0;
    lua_State *L = lua_open();
    char *bs, *ps, *pe;
    int sz = 0;
    unsigned int prevmode = getutmpmode();

    // re-entrant not supported!
    if (runningBBSLua)
        return 0;

    abortBBSLua = 0;

    // detect file
    bs = bbslua_attach(fpath, &sz);
    if (!bs)
        return 0;
    ps = bs;
    pe = ps + sz;

    if(!bbslua_detect_range(&ps, &pe))
    {
        // not detected
        bbslua_detach(bs, sz);
        return 0;
    }

    // init library
    bbsluaL_openlibs(L);
    luaL_openlib(L,   "bbs", lib_bbslua, 0);
    bbsluaRegConst(L, "bbs");

    // detect TOC meta data
    bbslua_load_TOC(L, ps, pe);

    // load script
    r = luaL_loadbuffer(L, ps, pe-ps, "BBS-Lua");
    
    // unmap
    bbslua_detach(bs, sz);

    if (r != 0)
    {
        const char *errmsg = lua_tostring(L, -1);
        move(b_lines-3, 0); clrtobot();
        outs("\n");
        outs(errmsg);
        vmsg("BBS-Lua 載入錯誤: 請通知作者修正程式碼。");
        lua_close(L);
        return 0;
    }

    setutmpmode(UMODE_BBSLUA);
    bbslua_logo(L);
    vmsgf("提醒您執行中隨時可按 [Ctrl-C] 強制中斷 BBS-Lua 程式");

    // ready for running
    clear();
    runningBBSLua =1;
    lua_sethook(L, bbsluaHook, LUA_MASKCOUNT, BLCONF_EXEC_COUNT );

    refresh();
    // check is now done inside hook
    r = lua_resume(L, 0);

    // even if r == yield, let's abort - you cannot yield main thread.

    if (r != 0)
    {
        const char *errmsg = lua_tostring(L, -1);
        move(b_lines-3, 0); clrtobot();
        outs("\n");
        if (errmsg) outs(errmsg);
    }

    lua_close(L);
    runningBBSLua =0;
    drop_input();

    grayout(0, b_lines, GRAYOUT_DARK);
    move(b_lines, 0); clrtoeol();
    vmsgf("BBS-Lua 執行結束%s。", 
            abortBBSLua ? " (使用者中斷)" : r ? " (程式錯誤)" : "");
    clear();
    setutmpmode(prevmode);

    return 0;
}


// vim:ts=4:sw=4