/*

luainit.w

Copyright 2006-2020 Taco Hoekwater <taco@@luatex.org>

This file is part of LuaTeX.

LuaTeX is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.

LuaTeX is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
License for more details.

You should have received a copy of the GNU General Public License along
with LuaTeX; if not, see <http://www.gnu.org/licenses/>.

*/

#include "ptexlib.h"

#include <kpathsea/c-stat.h>
#include <kpathsea/cnf.h>

#include "lua/luatex-api.h"

#include <locale.h>

extern int load_luatex_core_lua (lua_State * L);

/*tex internalized strings: see luatex-api.h */

set_make_keys;

/*tex

This file is getting a bit messy, but it is not simple to fix unilaterally. In
fact, it sets three C variables:

  |kpse_invocation_name| |kpse_invocation_short_name| |kpse->program_name|

and five environment variables:

  |SELFAUTOLOC| |SELFAUTODIR| |SELFAUTOPARENT| |SELFAUTOGRANDPARENT| |progname|

*/

const_string LUATEX_IHELP[] = {
    "Usage: " my_name " --lua=FILE [OPTION]... [TEXNAME[.tex]] [COMMANDS]",
    "   or: " my_name " --lua=FILE [OPTION]... \\FIRST-LINE",
    "   or: " my_name " --lua=FILE [OPTION]... &FMT ARGS",
    "  Run " MyName " on TEXNAME, usually creating TEXNAME.pdf.",
    "  Any remaining COMMANDS are processed as luatex input, after TEXNAME is read.",
    "",
    "  Alternatively, if the first non-option argument begins with a backslash,",
    "  " my_name " interprets all non-option arguments as an input line.",
    "",
    "  Alternatively, if the first non-option argument begins with a &, the",
    "  next word is taken as the FMT to read, overriding all else.  Any",
    "  remaining arguments are processed as above.",
    "",
    "  If no arguments or options are specified, prompt for input.",
    "",
    "  The following regular options are understood: ",
    "",
    "   --cnf-line =STRING            parse STRING as a configuration file line",
    "   --credits                     display credits and exit",
    "   --debug-format                enable format debugging",
    "   --draftmode                   switch on draft mode (generates no output PDF)",
    "   --[no-]file-line-error        disable/enable file:line:error style messages",
    "   --[no-]file-line-error-style  aliases of --[no-]file-line-error",
    "   --fmt=FORMAT                  load the format file FORMAT",
    "   --halt-on-error               stop processing at the first error",
    "   --help                        display help and exit",
    "   --ini                         be ini" my_name ", for dumping formats",
    "   --interaction=STRING          set interaction mode (STRING=batchmode/nonstopmode/scrollmode/errorstopmode)",
    "   --jobname=STRING              set the job name to STRING",
    "   --kpathsea-debug=NUMBER       set path searching debugging flags according to the bits of NUMBER",
    "   --lua=FILE                    load and execute a lua initialization script",
    "   --[no-]mktex=FMT              disable/enable mktexFMT generation (FMT=tex/tfm)",
    "   --nosocket                    disable the lua socket library",
    "   --output-comment=STRING       use STRING for DVI file comment instead of date (no effect for PDF)",
    "   --output-directory=DIR        use existing DIR as the directory to write files in",
    "   --output-format=FORMAT        use FORMAT for job output; FORMAT is 'dvi' or 'pdf'",
    "   --progname=STRING             set the program name to STRING",
    "   --recorder                    enable filename recorder",
    "   --safer                       disable easily exploitable lua commands",
    "   --[no-]shell-escape           disable/enable system commands",
    "   --shell-restricted            restrict system commands to a list of commands given in texmf.cnf",
    "   --synctex=NUMBER              enable synctex (see man synctex)",
    "   --utc                         init time to UTC",
    "   --version                     display version and exit",
    "",
    "Alternate behaviour models can be obtained by special switches",
    "",
    "  --luaonly                      run a lua file, then exit",
    "  --luaconly                     byte-compile a lua file, then exit",
    "  --luahashchars                 the bits used by current Lua interpreter for strings hashing",
#ifdef LuajitTeX
    "  --jiton                        turns the JIT compiler on (default off)",
    "  --jithash=STRING               choose the hash function for the lua strings (lua51|luajit20: default lua51)",
#endif
    "",
    "See the reference manual for more information about the startup process.",
    NULL
};

/*tex

Later we will put on environment |LC_CTYPE|, |LC_COLLATE| and |LC_NUMERIC| set to
|C|, so we need a place where to store the old values.

*/

const char *lc_ctype;
const char *lc_collate;
const char *lc_numeric;

/*
    "   --8bit                        ignored, input is assumed to be in UTF-8 encoding",
    "   --default-translate-file=FILE ignored, input is assumed to be in UTF-8 encoding",
    "   --etex                        ignored, the etex extensions are always active",
    "   --disable-write18             disable \\write18{SHELL COMMAND}",
    "   --enable-write18              enable \\write18{SHELL COMMAND}",
    "   --[no-]parse-first-line       ignored",
    "   --translate-file=FILE         ignored, input is assumed to be in UTF-8 encoding",
*/

/*tex

The return value will be the directory of the executable, e.g.: \.{c:/TeX/bin}

*/

static char *ex_selfdir(char *argv0)
{
#if defined(WIN32)
#if defined(__MINGW32__)
    char path[PATH_MAX], *fp;
    /*tex SearchPath() always gives back an absolute directory */
    if (SearchPath(NULL, argv0, ".exe", PATH_MAX, path, NULL) == 0)
        FATAL1("Can't determine where the executable %s is.\n", argv0);
    /*tex slashify the dirname */
    for (fp = path; fp && *fp; fp++)
        if (IS_DIR_SEP(*fp))
            *fp = DIR_SEP;
#else /* __MINGW32__ */
#define PATH_MAX 512
    char short_path[PATH_MAX], path[PATH_MAX], *fp;
    /*tex SearchPath() always gives back an absolute directory */
    if (SearchPath(NULL, argv0, ".exe", PATH_MAX, short_path, &fp) == 0)
        FATAL1("Can't determine where the executable %s is.\n", argv0);
    if (getlongpath(path, short_path, sizeof(path)) == 0) {
        FATAL1("This path points to an invalid file : %s\n", short_path);
    }
#endif /* __MINGW32__ */
    return xdirname(path);
#else /* WIN32 */
    return kpse_selfdir(argv0);
#endif
}

static void prepare_cmdline(lua_State * L, char **av, int ac, int zero_offset)
{
    int i;
    char *s;
    luaL_checkstack(L, ac + 3, "too many arguments to script");
    lua_createtable(L, 0, 0);
    for (i = 0; i < ac; i++) {
        lua_pushstring(L, av[i]);
        lua_rawseti(L, -2, (i - zero_offset));
    }
    lua_setglobal(L, "arg");
    lua_getglobal(L, "os");
    s = ex_selfdir(argv[0]);
    lua_pushstring(L, s);
    xfree(s);
    lua_setfield(L, -2, "selfdir");
    return;
}

int kpse_init = -1;

/*tex

Array and count of values given with --cnf-line.

*/
static string *user_cnf_lines = NULL;
static unsigned user_cnf_nlines = 0;



string input_name = NULL;

static string user_progname = NULL;

char *startup_filename = NULL;
int lua_only = 0;
int lua_offset = 0;
unsigned char show_luahashchars = 0;

#ifdef LuajitTeX
int luajiton   = 0;
char *jithash_hashname = NULL;
#endif

int safer_option = 0;
int nosocket_option = 0;
int utc_option = 0;

/*tex

Test whether getopt found an option ``A''. Assumes the option index is in the
variable |option_index|, and the option table in a variable |long_options|.

*/

#define ARGUMENT_IS(a) STREQ (long_options[option_index].name, a)

/*tex
    Nota Bene: we still intercept some options that other engines handle
    so that existing scripted usage will not fail.

    SunOS cc can't initialize automatic structs, so make this static.
*/

static struct option long_options[] = {
    {"fmt", 1, 0, 0},
    {"lua", 1, 0, 0},
    {"luaonly", 0, 0, 0},
    {"luahashchars", 0, 0, 0},
#ifdef LuajitTeX
    {"jiton", 0, 0, 0},
    {"jithash", 1, 0, 0},
#endif
    {"safer", 0, &safer_option, 1},
    {"utc", 0, &utc_option, 1},
    {"nosocket", 0, &nosocket_option, 1},
    {"help", 0, 0, 0},
    {"ini", 0, &ini_version, 1},
    {"interaction", 1, 0, 0},
    {"halt-on-error", 0, &haltonerrorp, 1},
    {"kpathsea-debug", 1, 0, 0},
    {"cnf-line", 1,0 ,0},
    {"progname", 1, 0, 0},
    {"version", 0, 0, 0},
    {"credits", 0, 0, 0},
    {"recorder", 0, 0, 0},
    {"etex", 0, 0, 0},
    {"output-comment", 1, 0, 0},
    {"output-directory", 1, 0, 0},
    {"draftmode", 0, 0, 0},
    {"output-format", 1, 0, 0},
    {"shell-escape", 0, &shellenabledp, 1},
    {"no-shell-escape", 0, &shellenabledp, -1},
    {"enable-write18", 0, &shellenabledp, 1},
    {"disable-write18", 0, &shellenabledp, -1},
    {"shell-restricted", 0, 0, 0},
    {"debug-format", 0, &debug_format_file, 1},
    {"file-line-error-style", 0, &filelineerrorstylep, 1},
    {"no-file-line-error-style", 0, &filelineerrorstylep, -1},
    /*tex Shorter option names for the above. */
    {"file-line-error", 0, &filelineerrorstylep, 1},
    {"no-file-line-error", 0, &filelineerrorstylep, -1},
    {"jobname", 1, 0, 0},
    {"parse-first-line", 0, &parsefirstlinep, 1},
    {"no-parse-first-line", 0, &parsefirstlinep, -1},
    {"translate-file", 1, 0, 0},
    {"default-translate-file", 1, 0, 0},
    {"8bit", 0, 0, 0},
    {"mktex", 1, 0, 0},
    {"no-mktex", 1, 0, 0},
    /*tex Synchronization: just like ``interaction'' above */
    {"synctex", 1, 0, 0},
    {0, 0, 0, 0}
};

int lua_numeric_field_by_index(lua_State * L, int name_index, int dflt)
{
    register int i = dflt;
    /*tex fetch the stringptr */
    lua_rawgeti(L, LUA_REGISTRYINDEX, name_index);
    lua_rawget(L, -2);
    if (lua_type(L, -1) == LUA_TNUMBER) {
        i = lua_roundnumber(L, -1);
    }
    lua_pop(L, 1);
    return i;
}

unsigned int lua_unsigned_numeric_field_by_index(lua_State * L, int name_index, int dflt)
{
    register unsigned int i = dflt;
    /*tex fetch the stringptr */
    lua_rawgeti(L, LUA_REGISTRYINDEX, name_index);
    lua_rawget(L, -2);
    if (lua_type(L, -1) == LUA_TNUMBER) {
        i = lua_uroundnumber(L, -1);
    }
    lua_pop(L, 1);
    return i;
}

static int recorderoption = 0;

static void parse_options(int ac, char **av)
{
#ifdef WIN32
    /*tex We save |argc| and |argv|. */
    int sargc = argc;
    char **sargv = argv;
#endif
     /*tex The `getopt' return code. */
    int g;
    int option_index;
    char *firstfile = NULL;
    /*tex Dont whine. */
    opterr = 0;
#ifdef LuajitTeX
    if ((strstr(argv[0], "luajittexlua") != NULL) ||
        (strstr(argv[0], "texluajit") != NULL) ||
        (strstr(argv[0], "texluahbjit") != NULL) ) {
#else
    if ((strstr(argv[0], "luatexlua") != NULL) ||
        (strstr(argv[0], "texlua") != NULL) ||
        (strstr(argv[0], "texluahb") != NULL)) {
#endif
        lua_only = 1;
        luainit = 1;
    }

    for (;;) {
        g = getopt_long_only(ac, av, "+", long_options, &option_index);
        if (g == -1) {
            /*tex End of arguments, exit the loop. */
            break;
        }
        if (g == '?')  {
            /*tex Unknown option. */
            if (!luainit)
                fprintf(stderr,"%s: unrecognized option '%s'\n", argv[0], argv[optind-1]);
            continue;
        }
        /* We have no short option names. */
        assert(g == 0);
        if (ARGUMENT_IS("luaonly")) {
            lua_only = 1;
            lua_offset = optind;
            luainit = 1;
        } else if (ARGUMENT_IS("lua")) {
            startup_filename = optarg;
            lua_offset = (optind - 1);
            luainit = 1;
#ifdef LuajitTeX
        } else if (ARGUMENT_IS("jiton")) {
            luajiton = 1;
        } else if (ARGUMENT_IS("jithash")) {
            size_t len = strlen(optarg);
            if (len<16) {
                jithash_hashname = optarg;
            } else {
                WARNING2("hash name truncated to 15 characters from %d. (%s)", (int) len, optarg);
                jithash_hashname = (string) xmalloc(16);
                strncpy(jithash_hashname, optarg, 15);
                jithash_hashname[15] = 0;
            }
#endif
        } else if (ARGUMENT_IS("luahashchars")) {
            show_luahashchars = 1;
        } else if (ARGUMENT_IS("kpathsea-debug")) {
            kpathsea_debug |= atoi(optarg);
        } else if (ARGUMENT_IS ("cnf-line")) {
	  if (user_cnf_lines == NULL) {
	    user_cnf_nlines = 1;
	    user_cnf_lines = xmalloc (sizeof (const_string));
	  } else {
	    user_cnf_nlines++;
	    user_cnf_lines = xrealloc (user_cnf_lines,
				       user_cnf_nlines * sizeof (const_string));
	  }
	  user_cnf_lines[user_cnf_nlines-1] = xstrdup (optarg);
        } else if (ARGUMENT_IS("progname")) {
            user_progname = optarg;
        } else if (ARGUMENT_IS("jobname")) {
            c_job_name = optarg;
        } else if (ARGUMENT_IS("fmt")) {
            dump_name = optarg;
        } else if (ARGUMENT_IS("output-directory")) {
            output_directory = optarg;
        } else if (ARGUMENT_IS("output-comment")) {
            size_t len = strlen(optarg);
            if (len < 256) {
                output_comment = optarg;
            } else {
                WARNING2("Comment truncated to 255 characters from %d. (%s)", (int) len, optarg);
                output_comment = (string) xmalloc(256);
                strncpy(output_comment, optarg, 255);
                output_comment[255] = 0;
            }
        } else if (ARGUMENT_IS("shell-restricted")) {
            shellenabledp = 1;
            restrictedshell = 1;
        } else if (ARGUMENT_IS("output-format")) {
            output_mode_option = 1;
            if (strcmp(optarg, "dvi") == 0) {
                output_mode_value = 0;
            } else if (strcmp(optarg, "pdf") == 0) {
                output_mode_value = 1;
            } else {
                WARNING1("Ignoring unknown value `%s' for --output-format",optarg);
                output_mode_option = 0;
            }
        } else if (ARGUMENT_IS("draftmode")) {
            draft_mode_option = 1;
            draft_mode_value = 1;
        } else if (ARGUMENT_IS("mktex")) {
            kpse_maketex_option(optarg, true);
        } else if (ARGUMENT_IS("no-mktex")) {
            kpse_maketex_option(optarg, false);
        } else if (ARGUMENT_IS("interaction")) {
            /* These numbers match CPP defines */
            if (STREQ(optarg, "batchmode")) {
                interactionoption = 0;
            } else if (STREQ(optarg, "nonstopmode")) {
                interactionoption = 1;
            } else if (STREQ(optarg, "scrollmode")) {
                interactionoption = 2;
            } else if (STREQ(optarg, "errorstopmode")) {
                interactionoption = 3;
            } else {
                WARNING1("Ignoring unknown argument `%s' to --interaction", optarg);
            }
        } else if (ARGUMENT_IS("synctex")) {
            /*tex Synchronize TeXnology: catching the command line option as a long  */
            synctexoption = (int) strtol(optarg, NULL, 0);
        } else if (ARGUMENT_IS("recorder")) {
            recorderoption = 1 ;
        } else if (ARGUMENT_IS("help")) {
            usagehelp(LUATEX_IHELP, BUG_ADDRESS);
        } else if (ARGUMENT_IS("version")) {
            print_version_banner();
            /* *INDENT-OFF* */
            puts("\n\nExecute  '" my_name " --credits'  for credits and version details.\n\n"
                 "There is NO warranty. Redistribution of this software is covered by\n"
                 "the terms of the GNU General Public License, version 2 or (at your option)\n"
                 "any later version. For more information about these matters, see the file\n"
                 "named COPYING and the LuaTeX source.\n\n"
                 "LuaTeX is Copyright 2020 Taco Hoekwater and the LuaTeX Team.\n");
            /* *INDENT-ON* */
            uexit(0);
        } else if (ARGUMENT_IS("credits")) {
            char *versions;
            initversionstring(&versions);
            print_version_banner();
            /* *INDENT-OFF* */
            puts("\n\nThe LuaTeX team is Hans Hagen, Hartmut Henkel, Taco Hoekwater, Luigi Scarso.\n\n"
                 MyName " merges and builds upon (parts of) the code from these projects:\n\n"
                 "tex       : Donald Knuth\n"
                 "etex      : Peter Breitenlohner, Phil Taylor and friends\n"
                 "omega     : John Plaice and Yannis Haralambous\n"
                 "aleph     : Giuseppe Bilotta\n"
                 "pdftex    : Han The Thanh and friends\n"
                 "kpathsea  : Karl Berry, Olaf Weber and others\n"
                 "lua       : Roberto Ierusalimschy, Waldemar Celes and Luiz Henrique de Figueiredo\n"
                 "metapost  : John Hobby, Taco Hoekwater, Luigi Scarso, Hans Hagen and friends\n"
                 "pplib     : Paweł Jackowski\n"
                 "fontforge : George Williams (partial)\n"
                 "luajit    : Mike Pall (used in LuajitTeX)\n");
            /* *INDENT-ON* */
            puts(versions);
            uexit(0);
        }
    }
    /*tex attempt to find |input_name| and |dump_name| */
    if (lua_only) {
        if (argv[optind]) {
            startup_filename = xstrdup(argv[optind]);
            lua_offset = optind;
        }
    } else if (argv[optind] && argv[optind][0] == '&') {
        dump_name = xstrdup(argv[optind] + 1);
    } else if (argv[optind] && argv[optind][0] != '\\') {
        if (argv[optind][0] == '*') {
            input_name = xstrdup(argv[optind] + 1);
        } else {
            firstfile = xstrdup(argv[optind]);
            if ((strstr(firstfile, ".lua") ==
                 firstfile + strlen(firstfile) - 4)
                || (strstr(firstfile, ".luc") ==
                    firstfile + strlen(firstfile) - 4)
                || (strstr(firstfile, ".LUA") ==
                    firstfile + strlen(firstfile) - 4)
                || (strstr(firstfile, ".LUC") ==
                    firstfile + strlen(firstfile) - 4)) {
                if (startup_filename == NULL) {
                    startup_filename = firstfile;
                    lua_offset = optind;
                    lua_only = 1;
                    luainit = 1;
                }
            } else {
                input_name = firstfile;
            }
        }
#ifdef WIN32
    } else if (sargc > 1 && sargv[sargc-1] && sargv[sargc-1][0] != '-' &&
               sargv[sargc-1][0] != '\\') {
        if (sargv[sargc-1][0] == '&')
            dump_name = xstrdup(sargv[sargc-1] + 1);
        else  {
            if (sargv[sargc-1][0] == '*')
                input_name = xstrdup(sargv[sargc-1] + 1);
            else
                input_name = xstrdup(sargv[sargc-1]);
            sargv[sargc-1] = normalize_quotes(input_name, "argument");
        }
        if (safer_option)      /* --safer implies --nosocket */
            nosocket_option = 1;
        return;
#endif
    }
    /*tex |--safer| implies |--nosocket| */
    if (safer_option)
        nosocket_option = 1;
    /*tex Finalize the input filename. */
    if (input_name != NULL) {
        argv[optind] = normalize_quotes(input_name, "argument");
    }
}

/*tex
    Test for readability.
*/

#define is_readable(a) (stat(a,&finfo)==0) \
    && S_ISREG(finfo.st_mode) \
    && (f=fopen(a,"r")) != NULL && !fclose(f)

static char *find_filename(char *name, const char *envkey)
{
    struct stat finfo;
    char *dirname = NULL;
    char *filename = NULL;
    FILE *f;
    if (is_readable(name)) {
        return name;
    } else {
        dirname = getenv(envkey);
        if ((dirname != NULL) && strlen(dirname)) {
            dirname = xstrdup(getenv(envkey));
            if (*(dirname + strlen(dirname) - 1) == '/') {
                *(dirname + strlen(dirname) - 1) = 0;
            }
            filename = xmalloc((unsigned) (strlen(dirname) + strlen(name) + 2));
            filename = concat3(dirname, "/", name);
            xfree(dirname);
            if (is_readable(filename)) {
                return filename;
            }
            xfree(filename);
        }
    }
    return NULL;
}

static void init_kpse(void)
{
    if (!user_progname) {
        user_progname = dump_name;
    } else if (!dump_name) {
        dump_name = user_progname;
    }
    if (!user_progname) {
        if (ini_version) {
            if (input_name) {
                char *p = input_name + strlen(input_name) - 1;
                while (p >= input_name) {
                    if (IS_DIR_SEP (*p)) {
                        p++;
                        input_name = p;
                        break;
                    }
                    p--;
                }
                user_progname = remove_suffix (input_name);
            }
            if (!user_progname) {
                user_progname = kpse_program_basename(argv[0]);
            }
        } else {
            if (!dump_name) {
                dump_name = kpse_program_basename(argv[0]);
            }
            user_progname = dump_name;
        }
    }
    kpse_set_program_enabled(kpse_fmt_format, MAKE_TEX_FMT_BY_DEFAULT, kpse_src_compile);
    kpse_set_program_name(argv[0], user_progname);
    /*tex set up 'restrictedshell' */
    init_shell_escape();
    init_start_time();
    program_name_set = 1 ;
    if (recorderoption) {
        recorder_enabled = 1;
    }
}

static void fix_dumpname(void)
{
    int dist;
    if (dump_name) {
        /*tex Adjust array for Pascal and provide extension, if needed. */
        dist = (int) (strlen(dump_name) - strlen(DUMP_EXT));
        if (strstr(dump_name, DUMP_EXT) == dump_name + dist)
            TEX_format_default = dump_name;
        else
            TEX_format_default = concat(dump_name, DUMP_EXT);
    } else {
        /*tex For |dump_name| to be NULL is a bug. */
        if (!ini_version) {
          fprintf(stdout, "no format given, quitting\n");
          exit(1);
        }
    }
}

/*tex
    Auxiliary function for kpse search.
*/

static const char *luatex_kpse_find_aux(lua_State *L, const char *name,
    kpse_file_format_type format, const char *errname)
{
    const char *filename;
    const char *altname;
    /*tex Lua convention */
    altname = luaL_gsub(L, name, ".", "/");
    filename = kpse_find_file(altname, format, false);
    if (filename == NULL) {
        filename = kpse_find_file(name, format, false);
    }
    if (filename == NULL) {
        lua_pushfstring(L, "\n\t[kpse %s searcher] file not found: " LUA_QS, errname, name);
    }
    return filename;
}

/*tex

    Here comes the \LUA\ search function. When kpathsea is not initialized, then it
    runs the normal \LUA\ function that is saved in the registry, otherwise it uses
    kpathsea.

    Two registry ref variables are needed: one for the actual \LUA\ function, the
    other for its environment .

*/

static int lua_loader_function = 0;

static int luatex_kpse_lua_find(lua_State * L)
{
    const char *filename;
    const char *name;
    name = luaL_checkstring(L, 1);
    if (program_name_set == 0) {
        lua_rawgeti(L, LUA_REGISTRYINDEX, lua_loader_function);
        lua_pushvalue(L, -2);
        lua_call(L, 1, 1);
        return 1;
    }
    filename = luatex_kpse_find_aux(L, name, kpse_lua_format, "lua");
    if (filename == NULL) {
        /*tex library not found in this path */
        return 1;
    }
    recorder_record_input(filename);
    if (luaL_loadfile(L, filename) != 0) {
        luaL_error(L, "error loading module %s from file %s:\n\t%s",
            lua_tostring(L, 1), filename, lua_tostring(L, -1));
    }
    /*tex library loaded successfully */
    return 1;
}

static int clua_loader_function = 0;
extern int searcher_C_luatex (lua_State *L, const char *name, const char *filename);

static int luatex_kpse_clua_find(lua_State * L)
{
    const char *filename;
    const char *name;
    if (safer_option) {
        /*tex library not found in this path */
        lua_pushliteral(L, "\n\t[C searcher disabled in safer mode]");
        return 1;
    }
    name = luaL_checkstring(L, 1);
    if (program_name_set == 0) {
        lua_rawgeti(L, LUA_REGISTRYINDEX, clua_loader_function);
        lua_pushvalue(L, -2);
        lua_call(L, 1, 1);
        return 1;
    } else {
        const char *path_saved;
        char *prefix, *postfix, *p, *total;
        char *extensionless;
        char *temp_name;
        int j;
        filename = luatex_kpse_find_aux(L, name, kpse_clua_format, "C");
        if (filename == NULL) {
            /*tex library not found in this path */
            return 1;
        }
        recorder_record_input(filename);
        extensionless = strdup(filename);
        if (!extensionless) {
            /*tex allocation failure */
            return 1;
        }
        /*tex Replace '.' with |LUA_DIRSEP| */
        temp_name = strdup(name);
        for(j=0; ; j++){
          if ((unsigned char)temp_name[j]=='\0') {
            break;
          }
          if ((unsigned char)temp_name[j]=='.'){
            temp_name[j]=LUA_DIRSEP[0];
          }
        }
        p = strstr(extensionless, temp_name);
        if (!p) {
            /*tex this would be exceedingly weird */
            return 1;
        }
        *p = '\0';
        prefix = strdup(extensionless);
        if (!prefix) {
            /*tex allocation failure */
            return 1;
        }
        postfix = strdup(p+strlen(name));
        if (!postfix) {
            /*tex allocation failure */
            return 1;
        }
        total = malloc(strlen(prefix)+strlen(postfix)+2);
        if (!total) return 1;  /* allocation failure */
        snprintf(total,strlen(prefix)+strlen(postfix)+2, "%s?%s", prefix, postfix);
        /*tex save package.path */
        lua_getglobal(L,"package");
        lua_getfield(L,-1,"cpath");
        path_saved = lua_tostring(L,-1);
        lua_pop(L,1);
        /*tex set package.path = "?" */
        lua_pushstring(L,total);
        lua_setfield(L,-2,"cpath");
        /*tex pop ``package'' */
        lua_pop(L,1);
        /*tex run function */
        lua_rawgeti(L, LUA_REGISTRYINDEX, clua_loader_function);
        lua_pushstring(L, name);
        lua_call(L, 1, 1);
        /*tex restore package.path */
        lua_getglobal(L,"package");
        lua_pushstring(L,path_saved);
        lua_setfield(L,-2,"cpath");
        /*tex pop ``package'' */
        lua_pop(L,1);
        free(extensionless);
        free(total);
        free(temp_name);
        return 1;
    }
}

/*tex

    Setting up the new search functions. This replaces package.searchers[2] and
    package.searchers[3] with the functions defined above.

*/

static void setup_lua_path(lua_State * L)
{
    lua_getglobal(L, "package");
#ifdef LuajitTeX
    lua_getfield(L, -1, "loaders");
#else
    lua_getfield(L, -1, "searchers");
#endif
    /*tex package.searchers[2] */
    lua_rawgeti(L, -1, 2);
    lua_loader_function = luaL_ref(L, LUA_REGISTRYINDEX);
    lua_pushcfunction(L, luatex_kpse_lua_find);
    /*tex replace the normal lua loader */
    lua_rawseti(L, -2, 2);
    /*tex package.searchers[3] */
    lua_rawgeti(L, -1, 3);
    clua_loader_function = luaL_ref(L, LUA_REGISTRYINDEX);
    lua_pushcfunction(L, luatex_kpse_clua_find);
    /*tex replace the normal lua lib loader */
    lua_rawseti(L, -2, 3);
    /*tex pop the array and table */
    lua_pop(L, 2);
}

/*tex

    Helper variables for the safe keeping of table ids.

*/

int l_pack_type_index       [PACK_TYPE_SIZE] ;
int l_group_code_index      [GROUP_CODE_SIZE];
int l_local_par_index       [LOCAL_PAR_SIZE];
int l_math_style_name_index [MATH_STYLE_NAME_SIZE];
int l_dir_par_index         [DIR_PAR_SIZE];
int l_dir_text_index_normal [DIR_TEXT_SIZE];
int l_dir_text_index_cancel [DIR_TEXT_SIZE];

int img_parms               [img_parms_max];
int img_pageboxes           [img_pageboxes_max];

int lua_show_valid_list(lua_State *L, const char **list, int offset, int max)
{
    int i;
    lua_newtable(L);
    for (i = 0; i < max; i++) {
        lua_pushinteger(L,i+offset);
        lua_pushstring(L, list[i]);
        lua_settable(L, -3);
    }
    return 1;
}

int lua_show_valid_keys(lua_State *L, int *list, int max)
{
    int i;
    lua_newtable(L);
    for (i = 0; i < max; i++) {
        lua_pushinteger(L,i+1);
        lua_rawgeti(L, LUA_REGISTRYINDEX, list[i]);
        lua_settable(L, -3);
    }
    return 1;
}

#if defined(WIN32) || defined(__MINGW32__) || defined(__CYGWIN__)
char **suffixlist;

/* Why do we add script stuff to this weird incomplete. Let's go more minimal. */

/*
    #define EXE_SUFFIXES ".com;.exe;.bat;.cmd;.vbs;.vbe;.js;.jse;.wsf;.wsh;.ws;.tcl;.py;.pyw"
*/

#define EXE_SUFFIXES ".com;.exe;.bat;.cmd"

static void mk_suffixlist(void)
{
    char **p;
    char *q, *r, *v;
    int n;
#  if defined(__CYGWIN__)
    v = xstrdup(EXE_SUFFIXES);
#  else
    v = (char *) getenv("PATHEXT");
    /*tex strlwr() exists also in MingW */
    if (v)
        v = (char *) strlwr(xstrdup(v));
    else
        v = xstrdup(EXE_SUFFIXES);
#  endif
    q = v;
    n = 0;
    while ((r = strchr(q, ';')) != NULL) {
        n++;
        r++;
        q = r;
    }
    if (*q)
        n++;
    suffixlist = (char **) xmalloc((n + 2) * sizeof(char *));
    p = suffixlist;
    *p = xstrdup(".dll");
    p++;
    q = v;
    while ((r = strchr(q, ';')) != NULL) {
        *r = '\0';
        *p = xstrdup(q);
        p++;
        r++;
        q = r;
    }
    if (*q) {
        *p = xstrdup(q);
        p++;
    }
    *p = NULL;
    free(v);
}
#endif

void lua_initialize(int ac, char **av)
{
    char *given_file = NULL;
    char *banner;
    size_t len;
    int starttime;
    int utc;
    static char LC_CTYPE_C[] = "LC_CTYPE=C";
    static char LC_COLLATE_C[] = "LC_COLLATE=C";
    static char LC_NUMERIC_C[] = "LC_NUMERIC=C";
    static char engine_luatex[] = "engine=" my_name;
    char *old_locale = NULL;
    char *env_locale = NULL;
    char *tmp = NULL;
    /*tex Save to pass along to topenin. */
    const char *fmt = "This is " MyName ", Version %s" WEB2CVERSION;
    argc = ac;
    argv = av;
    len = strlen(fmt) + strlen(luatex_version_string) ;
    banner = xmalloc(len);
    sprintf(banner, fmt, luatex_version_string);
    luatex_banner = banner;
    kpse_invocation_name = kpse_program_basename(argv[0]);
    /*tex be `luac' */
    if (argc >1) {
#ifdef LuajitTeX
        if (FILESTRCASEEQ(kpse_invocation_name, "texluajitc"))
            exit(luac_main(ac, av));
        if (STREQ(argv[1], "--luaconly") || STREQ(argv[1], "--luac")) {
            char *argv1 = xmalloc (strlen ("luajittex") + 1);
            av[1] = argv1;
            strcpy (av[1], "luajittex");
            exit(luac_main(--ac, ++av));
        }
#else
        if (FILESTRCASEEQ(kpse_invocation_name, "texluac"))
            exit(luac_main(ac, av));
        if (STREQ(argv[1], "--luaconly") || STREQ(argv[1], "--luac")) {
            strcpy(av[1], "luatex");
            exit(luac_main(--ac, ++av));
        }
#endif
    }
#if defined(WIN32) || defined(__MINGW32__) || defined(__CYGWIN__)
    mk_suffixlist();
#endif
    /*tex Must be initialized before options are parsed and might get adapted by config table.  */
    interactionoption = 4;
    filelineerrorstylep = false;
    haltonerrorp = false;
    tracefilenames = 1;
    dump_name = NULL;
    /*tex
        In the next option 0 means ``disable Synchronize TeXnology''. The
        |synctexoption| is a *.web variable. We initialize it to a weird value to
        catch the -synctex command line flag At runtime, if synctexoption is not
        |INT_MAX|, then it contains the command line option provided, otherwise
        no such option was given by the user.
    */
#define SYNCTEX_NO_OPTION INT_MAX
    synctexoption = SYNCTEX_NO_OPTION;
    /*tex parse commandline */
    parse_options(ac, av);
    if (lua_only) {
        /*tex Shell has no restrictions. */
        shellenabledp = true;
        restrictedshell = false;
        safer_option = 0;
    }
    /*tex
        Get the current locale (it should be |C|) and save |LC_CTYPE|, |LC_COLLATE|
        and |LC_NUMERIC|. Later |luainterpreter()| will consciously use them.
    */
    old_locale = xstrdup(setlocale (LC_ALL, NULL));
    lc_ctype = NULL;
    lc_collate = NULL;
    lc_numeric = NULL;
    if (old_locale) {
        /*tex
            If |setlocale| fails here, then the state could be compromised, and
            we exit.
        */
        env_locale = setlocale (LC_ALL, "");
        if (!env_locale && !lua_only) {
            fprintf(stderr,"Unable to read environment locale: exit now.\n");
            exit(1);
        }
        tmp = setlocale (LC_CTYPE, NULL);
        if (tmp) {
            lc_ctype = xstrdup(tmp);
        }
        tmp = setlocale (LC_COLLATE, NULL);
        if (tmp) {
            lc_collate = xstrdup(tmp);
        }
        tmp = setlocale (LC_NUMERIC, NULL);
        if (tmp) {
            lc_numeric = xstrdup(tmp);
        }
        /*tex
            Return to the previous locale if possible, otherwise it's a serious
            error and we exit: we can't ensure a 'sane' locale for lua.
        */
        env_locale = setlocale (LC_ALL, old_locale);
        if (!env_locale) {
          fprintf(stderr,"Unable to restore original locale %s: exit now.\n",old_locale);
          exit(1);
        }
        xfree(old_locale);
    } else {
       fprintf(stderr,"Unable to store environment locale.\n");
    }
    /*tex make sure that the locale is 'sane' (for lua) */
    putenv(LC_CTYPE_C);
    putenv(LC_COLLATE_C);
    putenv(LC_NUMERIC_C);
    /*tex this is sometimes needed */
    putenv(engine_luatex);
    /*tex add user's cnf values*/
    if (user_cnf_lines) {
     unsigned i;
     for (i = 0; i < user_cnf_nlines; i++) {
      /* debug printf ("ucnf%d: %s\n", i, user_cnf_lines[i]); */
      kpathsea_cnf_line_env_progname (kpse_def, user_cnf_lines[i]);
      free (user_cnf_lines[i]);
     }
    }
    luainterpreter();
    /*tex init internalized strings */
    set_init_keys;
    lua_pushstring(Luas,"lua.functions");
    lua_newtable(Luas);
    lua_settable(Luas,LUA_REGISTRYINDEX);
    /*tex here start the key definitions */
    set_l_pack_type_index;
    set_l_group_code_index;
    set_l_local_par_index;
    set_l_math_style_name_index;
    set_l_dir_par_index;
    set_l_dir_text_index;
    l_set_node_data();
    l_set_whatsit_data();
    l_set_token_data();
    set_l_img_keys_index;
    set_l_img_pageboxes_index;
    /*tex collect arguments */
    prepare_cmdline(Luas, argv, argc, lua_offset);
    setup_lua_path(Luas);
    if (startup_filename != NULL) {
        given_file = xstrdup(startup_filename);
        if (lua_only) {
            xfree(startup_filename);
        }
        startup_filename = find_filename(given_file, "LUATEXDIR");
    }
    /*tex now run the file */
    if (startup_filename != NULL) {
        char *v1;
        int tex_table_id = hide_lua_table(Luas, "tex");
        int token_table_id = hide_lua_table(Luas, "token");
        int node_table_id = hide_lua_table(Luas, "node");
        int pdf_table_id = hide_lua_table(Luas, "pdf");
        if (lua_only) {
            /*tex hide the 'tex' and 'pdf' table */
            if (load_luatex_core_lua(Luas)) {
                fprintf(stderr, "Error in execution of luatex-core.lua .\n");
            }
            if (luaL_loadfile(Luas, startup_filename)) {
                fprintf(stdout, "%s\n", lua_tostring(Luas, -1));
                exit(1);
            }
            init_tex_table(Luas);
            if (lua_pcall(Luas, 0, 0, 0)) {
                fprintf(stdout, "%s\n", lua_tostring(Luas, -1));
                lua_traceback(Luas);
             /*tex lua_close(Luas); */
                exit(1);
            } else {
                if (given_file)
                    free(given_file);
                /*tex lua_close(Luas); */
                exit(0);
            }
        }
        /*tex a normal tex run */
        init_tex_table(Luas);
        unhide_lua_table(Luas, "tex", tex_table_id);
        unhide_lua_table(Luas, "pdf", pdf_table_id);
        unhide_lua_table(Luas, "token", token_table_id);
        unhide_lua_table(Luas, "node", node_table_id);
        if (luaL_loadfile(Luas, startup_filename)) {
            fprintf(stdout, "%s\n", lua_tostring(Luas, -1));
            exit(1);
        }
        if (lua_pcall(Luas, 0, 0, 0)) {
            fprintf(stdout, "%s\n", lua_tostring(Luas, -1));
            lua_traceback(Luas);
            exit(1);
        }
        if (!input_name) {
            get_lua_string("texconfig", "jobname", &input_name);
        }
        if (!dump_name) {
            get_lua_string("texconfig", "formatname", &dump_name);
        }
        kpse_init = -1;
        get_lua_boolean("texconfig", "kpse_init", &kpse_init);
        if (kpse_init != 0) {
            /*tex re-enable loading of texmf.cnf values, see luatex.ch */
            luainit = 0;
            init_kpse();
            kpse_init = 1;
        }
        /*tex |prohibit_file_trace| (boolean) */
        get_lua_boolean("texconfig", "trace_file_names", &tracefilenames);
        /*tex |file_line_error| */
        get_lua_boolean("texconfig", "file_line_error", &filelineerrorstylep);
        /*tex |halt_on_error| */
        get_lua_boolean("texconfig", "halt_on_error", &haltonerrorp);
        /*tex |interactionoption| */
        get_lua_number("texconfig", "interaction", &interactionoption);
        if ((interactionoption < 0) || (interactionoption > 4)) {
            interactionoption = 4;
        }
        /*tex |restrictedshell| */
        v1 = NULL;
        get_lua_string("texconfig", "shell_escape", &v1);
        if (v1) {
            if (*v1 == 't' || *v1 == 'y' || *v1 == '1') {
                shellenabledp = 1;
            } else if (*v1 == 'p') {
                shellenabledp = 1;
                restrictedshell = 1;
            }
            free(v1);
        }
        /*tex If shell escapes are restricted, get allowed cmds from cnf.  */
        if (shellenabledp && restrictedshell == 1) {
            v1 = NULL;
            get_lua_string("texconfig", "shell_escape_commands", &v1);
            if (v1) {
                mk_shellcmdlist(v1);
            free(v1);
            }
        }
        starttime = -1 ;
        get_lua_number("texconfig", "start_time", &starttime);
        if (starttime < 0) {
            /*tex
                We provide this one for compatibility reasons and therefore also in
                uppercase.
            */
            get_lua_number("texconfig", "SOURCE_DATE_EPOCH", &starttime);
        }
        if (starttime >= 0) {
            set_start_time(starttime);
        }
        utc = -1 ;
        get_lua_boolean("texconfig", "use_utc_time", &utc);
        if (utc >= 0 && utc <= 1) {
            utc_option = utc;
        }
        fix_dumpname();
    } else if (luainit) {
        if (given_file) {
            fprintf(stdout, "%s file %s not found\n", (lua_only ? "Script" : "Configuration"), given_file);
            free(given_file);
        } else {
            fprintf(stdout, "No %s file given\n", (lua_only ? "script" : "configuration"));
        }
        exit(1);
    } else {
        /* init */
        init_kpse();
        kpse_init = 1;
        fix_dumpname();
    }
    /*tex Here we load luatex-core.lua which takes care of some protection on demand. */
    if (load_luatex_core_lua(Luas)) {
        fprintf(stderr, "Error in execution of luatex-core.lua .\n");
    }
}

void check_texconfig_init(void)
{
    if (Luas != NULL) {
        lua_getglobal(Luas, "texconfig");
        if (lua_istable(Luas, -1)) {
            lua_getfield(Luas, -1, "init");
            if (lua_isfunction(Luas, -1)) {
                int i = lua_pcall(Luas, 0, 0, 0);
                if (i != 0) {
                    /*tex
                        We can't be more precise hereas it's called before \TEX\
                        initialization happens.
                    */
                    fprintf(stderr, "This went wrong: %s\n", lua_tostring(Luas, -1));
                    error();
                }
            }
        }
    }
}
