summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/luatexdir/lua/luainit.w
blob: f61bc0b79c312f6f85a5f9030b32684fbc01dd33 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
% luainit.w
% 
% Copyright 2006-2010 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/>. 

@ @c
#include "openbsd-compat.h"
#include <kpathsea/c-stat.h>

#include "lua/luatex-api.h"
#include "ptexlib.h"

static const char _svn_version[] =
    "$Id: luainit.w 4244 2011-05-05 09:31:30Z taco $ $URL: http://foundry.supelec.fr/svn/luatex/branches/0.70.x/source/texk/web2c/luatexdir/lua/luainit.w $";

@ 
TH: TODO

This file is getting a bit messy, but it is not simple to fix unilaterally.

Better to wait until Karl has some time (after texlive 2008) so we can
synchronize with kpathsea. One problem, for instance, is that I would
like to resolve the full executable path.  |kpse_set_program_name()| does
that, indirectly (by setting SELFAUTOLOC in the environment), but it
does much more, making it hard to use for our purpose. 

In fact, it sets three C variables:

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

and four environment variables:

  SELFAUTOLOC  SELFAUTODIR  SELFAUTOPARENT  progname

@c
const_string LUATEX_IHELP[] = {
    "Usage: luatex --lua=FILE [OPTION]... [TEXNAME[.tex]] [COMMANDS]",
    "   or: luatex --lua=FILE [OPTION]... \\FIRST-LINE",
    "   or: luatex --lua=FILE [OPTION]... &FMT ARGS",
    "  Run LuaTeX 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,",
    "  luatex 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: ",
    "",
    "   --8bit                        ignored, input is assumed to be in UTF-8 encoding",
    "   --credits                     display credits and exit",
    "   --debug-format                enable format debugging",
    "   --default-translate-file=     ignored, input is assumed to be in UTF-8 encoding",
    "   --disable-write18             disable \\write18{SHELL COMMAND}",
    "   --draftmode                   switch on draft mode (generates no output PDF)",
    "   --enable-write18              enable \\write18{SHELL COMMAND}",
    "   --etex                        ignored, the etex extensions are always active",
    "   --[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 iniluatex, 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=s                       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 DIR as the directory to write files to",
    "   --output-format=FORMAT        use FORMAT for job output; FORMAT is 'dvi' or 'pdf'",
    "   --[no-]parse-first-line       disable/enable parsing of the first line of the input file",
    "   --progname=STRING             set the program name to STRING",
    "   --recorder                    enable filename recorder",
    "   --safer                       disable easily exploitable lua commands",
    "   --[no-]shell-escape           disable/enable \\write18{SHELL COMMAND}",
    "   --shell-restricted            restrict \\write18 to a list of commands given in texmf.cnf",
    "   --synctex=NUMBER              enable synctex",
    "   --translate-file=             ignored, input is assumed to be in UTF-8 encoding",
    "   --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",
    "",
    "See the reference manual for more information about the startup process.",
    NULL
};

@ The return value will be the directory of the executable, e.g.: \.{c:/TeX/bin}
@c
static char *ex_selfdir(char *argv0)
{
#if defined(WIN32)
    char path[PATH_MAX], *fp;

    /* 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);
    /* slashify the dirname */
    for (fp = path; fp && *fp; fp++)
        if (IS_DIR_SEP(*fp))
            *fp = DIR_SEP;
    return xdirname(path);
#else
    return kpse_selfdir(argv0);
#endif
}

@ @c
static void
prepare_cmdline(lua_State * L, char **argv, int argc, int zero_offset)
{
    int i;
    char *s;
    luaL_checkstack(L, argc + 3, "too many arguments to script");
    lua_createtable(L, 0, 0);
    for (i = 0; i < argc; i++) {
        lua_pushstring(L, argv[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;
}

@ @c
string input_name = NULL;

static string user_progname = NULL;

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

int safer_option = 0;
int nosocket_option = 0;

@ Reading the options.  

@ 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|.  

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

/* 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},
{"safer", 0, &safer_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},
{"progname", 1, 0, 0},
{"version", 0, 0, 0},
{"credits", 0, 0, 0},
{"recorder", 0, &recorder_enabled, 1},
{"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},
      /* 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},
/* Synchronization: just like "interaction" above */
{"synctex", 1, 0, 0},
{0, 0, 0, 0}
};

@ @c
static void parse_options(int argc, char **argv)
{
    int g;                      /* `getopt' return code.  */
    int option_index;
    char *firstfile = NULL;
    opterr = 0;                 /* dont whine */
    if ((strstr(argv[0], "luatexlua") != NULL) ||
        (strstr(argv[0], "texlua") != NULL)) {
        lua_only = 1;
        luainit = 1;
    }
    for (;;) {
        g = getopt_long_only(argc, argv, "+", long_options, &option_index);

        if (g == -1)            /* End of arguments, exit the loop.  */
            break;
        if (g == '?')           /* Unknown option.  */
            continue;

        assert(g == 0);         /* We have no short option names.  */

        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;

        } else if (ARGUMENT_IS("kpathsea-debug")) {
            kpathsea_debug |= atoi(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")) {
            pdf_output_option = 1;
            if (strcmp(optarg, "dvi") == 0) {
                pdf_output_value = 0;
            } else if (strcmp(optarg, "pdf") == 0) {
                pdf_output_value = 2;
            } else {
                WARNING1("Ignoring unknown value `%s' for --output-format",
                         optarg);
                pdf_output_option = 0;
            }

        } else if (ARGUMENT_IS("draftmode")) {
            pdf_draftmode_option = 1;
            pdf_draftmode_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")) {
            /* Synchronize TeXnology: catching the command line option as a long  */
            synctexoption = (int) strtol(optarg, NULL, 0);

        } else if (ARGUMENT_IS("help")) {
            usagehelp(LUATEX_IHELP, BUG_ADDRESS);

        } else if (ARGUMENT_IS("version")) {
            print_version_banner();
            /* *INDENT-OFF* */
            puts("\n\nExecute  'luatex --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. For more\n"
                 "information about these matters, see the file named COPYING and\n"
                 "the LuaTeX source.\n\n" 
                 "Copyright 2010 Taco Hoekwater, 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.\n" 
                 "LuaTeX merges and builds upon (parts of) the code from these projects:\n\n" 
                 "tex       by Donald Knuth\n" 
                 "etex      by Peter Breitenlohner, Phil Taylor and friends\n" 
                 "omega     by John Plaice and Yannis Haralambous\n" 
                 "aleph     by Giuseppe Bilotta\n" 
                 "pdftex    by Han The Thanh and friends\n" 
                 "kpathsea  by Karl Berry, Olaf Weber and others\n" 
                 "lua       by Roberto Ierusalimschy, Waldemar Celes,\n" 
                 "             Luiz Henrique de Figueiredo\n" 
                 "metapost  by John Hobby, Taco Hoekwater and friends.\n" 
                 "poppler   by Derek Noonburg, Kristian Høgsberg (partial)\n" 
                 "fontforge by George Williams (partial)\n\n" 
                 "Some extensions to lua and additional lua libraries are used, as well as\n" 
                 "libraries for graphic inclusion. More details can be found in the source.\n" 
                 "Code development was sponsored by a grant from Colorado State University\n" 
                 "via the 'oriental tex' project, the TeX User Groups, and donations.\n");
            /* *INDENT-ON* */
            puts(versions);
            uexit(0);
        }
    }
    /* attempt to find |input_name| / |dump_name| */
    if (lua_only) {
	if (argv[optind]) {
 	   startup_filename = strdup(argv[optind]);
           lua_offset = optind;
        }
    } else if (argv[optind] && argv[optind][0] == '&') {
        dump_name = strdup(argv[optind] + 1);
    } else if (argv[optind] && argv[optind][0] != '\\') {
        if (argv[optind][0] == '*') {
            input_name = strdup(argv[optind] + 1);
        } else {
            firstfile = strdup(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;
            }
        }
    }
    if (safer_option)           /* --safer implies --nosocket */
        nosocket_option = 1;

    /* Finalize the input filename. */
    if (input_name != NULL) {
        argv[optind] = normalize_quotes(input_name, "argument");
    }
}

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

@ @c
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 = strdup(getenv(envkey));
            if (*(dirname + strlen(dirname) - 1) == '/') {
                *(dirname + strlen(dirname) - 1) = 0;
            }
            filename = xmalloc((unsigned) (strlen(dirname) + strlen(name) + 2));
            filename = concat3(dirname, "/", name);
            if (is_readable(filename)) {
                xfree(dirname);
                return filename;
            }
            xfree(filename);
        }
    }
    return NULL;
}


@ @c
static char *cleaned_invocation_name(char *arg)
{
    char *ret, *dot;
    const char *start = xbasename(arg);
    ret = xstrdup(start);
    dot = index(ret, '.');
    if (dot != NULL) {
        *dot = 0;               /* chop */
    }
    return ret;
}

@ @c
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) {
            user_progname = input_name;
            if (!user_progname) {
                user_progname = cleaned_invocation_name(argv[0]);
            }
        } else {
            if (!dump_name) {
                dump_name = cleaned_invocation_name(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);
    init_shell_escape();        /* set up 'restrictedshell' */
    program_name_set = 1;
}

@ @c
static void fix_dumpname(void)
{
    int dist;
    if (dump_name) {
        /* 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 {
        /* For |dump_name| to be NULL is a bug.  */
        if (!ini_version)
            abort();
    }
}

@ lua require patch

@ Auxiliary function for kpse search

@c
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;
    altname = luaL_gsub(L, name, ".", "/"); /* Lua convention */
    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;
}

@ 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 .

@c
static int lua_loader_function = 0;
static int lua_loader_env = 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_CFunction orig_func;
        lua_rawgeti(L, LUA_REGISTRYINDEX, lua_loader_function);
        lua_rawgeti(L, LUA_REGISTRYINDEX, lua_loader_env);
        lua_replace(L, LUA_ENVIRONINDEX);
        orig_func = lua_tocfunction(L, -1);
        lua_pop(L, 1);
        return (orig_func) (L);
    }
    filename = luatex_kpse_find_aux(L, name, kpse_lua_format, "lua");
    if (filename == NULL)
        return 1;               /* library not found in this path */
    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));
    }
    return 1;                   /* library loaded successfully */
}

@ @c
static int clua_loader_function = 0;
static int clua_loader_env = 0;

static int luatex_kpse_clua_find(lua_State * L)
{
    const char *filename;
    const char *name;
    if (safer_option) {
        lua_pushliteral(L, "\n\t[C searcher disabled in safer mode]");
        return 1;               /* library not found in this path */
    }
    name = luaL_checkstring(L, 1);
    if (program_name_set == 0) {
        lua_CFunction orig_func;
        lua_rawgeti(L, LUA_REGISTRYINDEX, clua_loader_function);
        lua_rawgeti(L, LUA_REGISTRYINDEX, clua_loader_env);
        lua_replace(L, LUA_ENVIRONINDEX);
        orig_func = lua_tocfunction(L, -1);
        lua_pop(L, 1);
        return (orig_func) (L);
    }
    filename = luatex_kpse_find_aux(L, name, kpse_clua_format, "C");
    if (filename == NULL)
        return 1;               /* library not found in this path */
    return loader_C_luatex(L, name, filename);
}

@ @c
static int clua_loadall_function = 0;
static int clua_loadall_env = 0;

static int luatex_kpse_cluaall_find(lua_State * L)
{
    const char *filename;
    const char *name;
    char *fixedname;
    const char *p = NULL;
    if (safer_option) {
        lua_pushliteral(L, "\n\t[All-in-one searcher disabled in safer mode]");
        return 1;               /* library not found in this path */
    }
    name = luaL_checkstring(L, 1);
    p = strchr(name, '.');
    if (program_name_set == 0) {
        lua_CFunction orig_func;
        lua_rawgeti(L, LUA_REGISTRYINDEX, clua_loadall_function);
        lua_rawgeti(L, LUA_REGISTRYINDEX, clua_loadall_env);
        lua_replace(L, LUA_ENVIRONINDEX);
        orig_func = lua_tocfunction(L, -1);
        lua_pop(L, 1);
        return (orig_func) (L);
    }
    if (p == NULL) return 0;  /* is root */
    fixedname = xmalloc((size_t)(p - name)+1);
    memcpy(fixedname,name,(size_t)(p - name));
    fixedname[(p - name)] = '\0';
    filename = luatex_kpse_find_aux(L, fixedname, kpse_clua_format, "All-in-one");
    free(fixedname);
    if (filename == NULL)
	return 1;               /* library not found in this path */
    return loader_Call_luatex(L, name, filename);
}

@ Setting up the new search functions. 

 This replaces package.loaders[2] with the function defined above.

@c
static void setup_lua_path(lua_State * L)
{
    lua_getglobal(L, "package");
    lua_getfield(L, -1, "loaders");
    lua_rawgeti(L, -1, 2);      /* package.loaders[2] */
    lua_getfenv(L, -1);
    lua_loader_env = luaL_ref(L, LUA_REGISTRYINDEX);
    lua_loader_function = luaL_ref(L, LUA_REGISTRYINDEX);
    lua_pushcfunction(L, luatex_kpse_lua_find);
    lua_rawseti(L, -2, 2);      /* replace the normal lua loader */

    lua_rawgeti(L, -1, 3);      /* package.loaders[3] */
    lua_getfenv(L, -1);
    clua_loader_env = luaL_ref(L, LUA_REGISTRYINDEX);
    clua_loader_function = luaL_ref(L, LUA_REGISTRYINDEX);
    lua_pushcfunction(L, luatex_kpse_clua_find);
    lua_rawseti(L, -2, 3);      /* replace the normal lua lib loader */

    lua_rawgeti(L, -1, 4);      /* package.loaders[4] */
    lua_getfenv(L, -1);
    clua_loadall_env = luaL_ref(L, LUA_REGISTRYINDEX);
    clua_loadall_function = luaL_ref(L, LUA_REGISTRYINDEX);
    lua_pushcfunction(L, luatex_kpse_cluaall_find);
    lua_rawseti(L, -2, 4);      /* replace the normal lua lib loader */

    lua_pop(L, 2);              /* pop the array and table */
}

@ helper variables for the safe keeping of table ids

@c
int tex_table_id;
int pdf_table_id;
int token_table_id;
int node_table_id;


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

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

@ @c
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");
    if (v)                      /* strlwr() exists also in MingW */
        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

@ @c
void lua_initialize(int ac, char **av)
{

    char *given_file = NULL;
    char *banner;
    int kpse_init;
    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=luatex";
    /* Save to pass along to topenin.  */
    argc = ac;
    argv = av;

    if (luatex_svn < 0) {
        if (asprintf(&banner, "This is LuaTeX, Version %s-%d",
                     luatex_version_string, luatex_date_info) < 0) {
            exit(EXIT_FAILURE);
        }
    } else {
        if (asprintf(&banner, "This is LuaTeX, Version %s-%d (rev %d)",
                     luatex_version_string, luatex_date_info, luatex_svn) < 0) {
            exit(EXIT_FAILURE);
        }
    }
    ptexbanner = banner;

    kpse_invocation_name = cleaned_invocation_name(argv[0]);

    /* be 'luac' */
    if (argc > 1 &&
        (STREQ(kpse_invocation_name, "texluac") ||
         STREQ(argv[1], "--luaconly") || STREQ(argv[1], "--luac"))) {
        exit(luac_main(ac, av));
    }
#if defined(WIN32) || defined(__MINGW32__) || defined(__CYGWIN__)
    mk_suffixlist();
#endif

    /* Must be initialized before options are parsed.  */
    interactionoption = 4;
    dump_name = NULL;

    /* 0 means "disable Synchronize TeXnology".
     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;

    /* parse commandline */
    parse_options(ac, av);
    if (lua_only)
        shellenabledp = true;

    /* make sure that the locale is 'sane' (for lua) */

    putenv(LC_CTYPE_C);
    putenv(LC_COLLATE_C);
    putenv(LC_NUMERIC_C);

    /* this is sometimes needed */
    putenv(engine_luatex);

    luainterpreter();

    prepare_cmdline(Luas, argv, argc, lua_offset);      /* collect arguments */
    setup_lua_path(Luas);

    if (startup_filename != NULL) {
        given_file = xstrdup(startup_filename);
        startup_filename = find_filename(startup_filename, "LUATEXDIR");
    }
    /* now run the file */
    if (startup_filename != NULL) {
        char *v1;
        /* hide the 'tex' and 'pdf' table */
        tex_table_id = hide_lua_table(Luas, "tex");
        token_table_id = hide_lua_table(Luas, "token");
        node_table_id = hide_lua_table(Luas, "node");
        pdf_table_id = hide_lua_table(Luas, "pdf");

        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));
            exit(1);
        }
        /* no filename? quit now! */
        if (!input_name) {
            get_lua_string("texconfig", "jobname", &input_name);
        }
        if (!dump_name) {
            get_lua_string("texconfig", "formatname", &dump_name);
        }
        if (lua_only) {
            if (given_file)
                free(given_file);
            /* this is not strictly needed but it pleases valgrind */
            lua_close(Luas);
            exit(0);
        }
        /* unhide the 'tex' and 'pdf' table */
        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);

        /* |kpse_init| */
        kpse_init = -1;
        get_lua_boolean("texconfig", "kpse_init", &kpse_init);

        if (kpse_init != 0) {
            luainit = 0;        /* re-enable loading of texmf.cnf values, see luatex.ch */
            init_kpse();
        }
        /* |prohibit_file_trace| (boolean) */
        tracefilenames = 1;
        get_lua_boolean("texconfig", "trace_file_names", &tracefilenames);

        /* |file_line_error| */
        filelineerrorstylep = false;
        get_lua_boolean("texconfig", "file_line_error", &filelineerrorstylep);

        /* |halt_on_error| */
        haltonerrorp = false;
        get_lua_boolean("texconfig", "halt_on_error", &haltonerrorp);

        /* |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;
            }
        }
        /* 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);
            }
        }

        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();
            fix_dumpname();
        }
    }
}

@ @c
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) {
                    /* Can't be more precise here, called before TeX initialization  */
                    fprintf(stderr, "This went wrong: %s\n",
                            lua_tostring(Luas, -1));
                    error();
                }
            }
        }
    }
}

@ @c
void write_svnversion(char *v)
{
    char *a_head, *n;
    char *a = strdup(v);
    size_t l = strlen("$Id: luatex.web ");
    if (a != NULL) {
        a_head = a;
        if (strlen(a) > l)
            a += l;
        n = a;
        while (*n != '\0' && *n != ' ')
            n++;
        *n = '\0';
        fprintf(stdout, " luatex.web >= v%s", a);
        free(a_head);
    }
}