summaryrefslogtreecommitdiff
path: root/Build/source/texk/web2c/luatexdir/luatex.c
blob: d057b1830b98c0fe11e4c98c36e4fc9ecdb551f7 (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
928
929
930
931
932
933
934
/* luatex.c: Hand-coded routines for TeX or Metafont in C.  Originally
   written by Tim Morgan, drawing from other Unix ports of TeX.  This is
   a collection of miscellany, everything that's easier (or only
   possible) to do in C.
   
   This file is public domain.  */

/* This file is used to create texextra.c etc., with this line
   changed to include texd.h or mfd.h.  The ?d.h file is what
   #defines TeX or MF, which avoids the need for a special
   Makefile rule.  */

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

static const char _svn_version[] =
    "$Id: luatex.c 4611 2013-03-25 09:13:12Z taco $ "
    "$URL: https://foundry.supelec.fr/svn/luatex/tags/beta-0.76.0/source/texk/web2c/luatexdir/luatex.c $";

#define TeX

int luatex_svn = luatex_svn_revision;
int luatex_version = 76;        /* \.{\\luatexversion}  */
int luatex_revision = '0';      /* \.{\\luatexrevision}  */
int luatex_date_info = -extra_version_info;     /* the compile date is negated */
const char *luatex_version_string = "beta-0.76.0";
const char *engine_name = "luatex";     /* the name of this engine */

#include <kpathsea/c-ctype.h>
#include <kpathsea/line.h>
#include <kpathsea/readable.h>
#include <kpathsea/variable.h>
#include <kpathsea/absolute.h>
#ifdef WIN32
#include <kpathsea/concatn.h>
#endif

#ifdef _MSC_VER
#undef timezone
#endif

#include <time.h>               /* For `struct tm'.  */
#if defined (HAVE_SYS_TIME_H)
#  include <sys/time.h>
#elif defined (HAVE_SYS_TIMEB_H)
#  include <sys/timeb.h>
#endif

#if defined(__STDC__)
#  include <locale.h>
#endif

#include <signal.h>             /* Catch interrupts.  */


/* {tex,mf}d.h defines TeX, MF, INI, and other such symbols.
   Unfortunately there's no way to get the banner into this code, so
   just repeat the text.  */
#define edit_var "TEXEDIT"

/* Shell escape.

   If shellenabledp == 0, all shell escapes are forbidden.
   If (shellenabledp == 1 && restrictedshell == 0), any command
     is allowed for a shell escape.
   If (shellenabledp == 1 && restrictedshell == 1), only commands
     given in the configuration file as
   shell_escape_commands = kpsewhich,ebb,extractbb,mpost,metafun,...
     (no spaces between commands) in texmf.cnf are allowed for a shell
     escape in a restricted form: command name and arguments should be
     separated by a white space. The first word should be a command
     name. The quotation character for an argument with spaces,
     including a pathname, should be ".  ' should not be used.

     Internally, all arguments are quoted by ' (Unix) or " (Windows)
     before calling the system() function in order to forbid execution
     of any embedded command.  In addition, on Windows, special
     characters of cmd.exe are escaped by using (^).

   If the --shell-escape option is given, we set
     shellenabledp = 1 and restrictedshell = 0, i.e., any command is allowed.
   If the --shell-restricted option is given, we set
     shellenabledp = 1 and restrictedshell = 1, i.e., only given cmds allowed.
   If the --no-shell-escape option is given, we set
     shellenabledp = -1 (and restrictedshell is irrelevant).
   If none of these option are given, there are three cases:
   (1) In the case where
       shell_escape = y or
       shell_escape = t or
       shell_escape = 1
       it becomes shellenabledp = 1 and restrictedshell = 0,
       that is, any command is allowed.
   (2) In the case where
       shell_escape = p
       it becomes shellenabledp = 1 and restrictedshell = 1,
       that is, restricted shell escape is allowed.
   (3) In all other cases, shellenabledp = 0, that is, shell
       escape is forbidden. The value of restrictedshell is
       irrelevant if shellenabledp == 0.
*/

#ifdef TeX

/* cmdlist is a list of allowed commands which are given like this:
   shell_escape_commands = kpsewhich,ebb,extractbb,mpost,metafun
   in texmf.cnf. */

static char **cmdlist = NULL;

void mk_shellcmdlist(char *v)
{
    char **p;
    char *q, *r;
    unsigned int n;

    q = v;
    n = 0;

/* analyze the variable shell_escape_commands = foo,bar,...
   spaces before and after (,) are not allowed. */

    while ((r = strchr(q, ',')) != 0) {
        n++;
        r++;
        q = r;
    }
    if (*q)
        n++;
    cmdlist = (char **) xmalloc((unsigned) ((n + 1) * sizeof(char *)));
    p = cmdlist;
    q = v;
    while ((r = strchr(q, ',')) != 0) {
        *r = '\0';
        *p = (char *) xmalloc((unsigned) strlen(q) + 1);
        strcpy(*p, q);
        *r = ',';
        r++;
        q = r;
        p++;
    }
    if (*q) {
        *p = (char *) xmalloc((unsigned) strlen(q) + 1);
        strcpy(*p, q);
        p++;
        *p = NULL;
    } else
        *p = NULL;
}

/* Called from maininit.  Not static because also called from
   luatexdir/lua/luainit.c.  */

void init_shell_escape(void)
{
    if (shellenabledp < 0) {    /* --no-shell-escape on cmd line */
        shellenabledp = 0;

    } else {
        if (shellenabledp == 0) {       /* no shell options on cmd line, check cnf */
            char *v1 = kpse_var_value("shell_escape");
            if (v1) {
                if (*v1 == 't' || *v1 == 'y' || *v1 == '1') {
                    shellenabledp = 1;
                } else if (*v1 == 'p') {
                    shellenabledp = 1;
                    restrictedshell = 1;
                }
                free(v1);
            }
        }

        /* If shell escapes are restricted, get allowed cmds from cnf.  */
        if (shellenabledp && restrictedshell == 1) {
            char *v2 = kpse_var_value("shell_escape_commands");
            if (v2) {
                mk_shellcmdlist(v2);
                free(v2);
            }
        }
    }
}

#  ifdef WIN32
#    define QUOTE '"'
#  else
#    define QUOTE '\''
#  endif

#  ifdef WIN32
static int char_needs_quote(int c)
{
/* special characters of cmd.exe */

    return (c == '&' || c == '|' || c == '%' || c == '<' ||
            c == '>' || c == ';' || c == ',' || c == '(' || c == ')');
}
#  endif

static int Isspace(char c)
{
    return (c == ' ' || c == '\t');
}

/* return values:
  -1 : invalid quotation of an argument
   0 : command is not allowed
   2 : restricted shell escape, CMD is allowed.
   
   We set *SAFECMD to a safely-quoted version of *CMD; this is what
   should get executed.  And we set CMDNAME to its first word; this is
   what is checked against the shell_escape_commands list.  */

int shell_cmd_is_allowed(const char *cmd, char **safecmd, char **cmdname)
{
    char **p;
    char *buf;
    char *c, *d;
    const char *s;
    int pre;
    unsigned spaces;
    int allow = 0;

    /* pre == 1 means that the previous character is a white space
       pre == 0 means that the previous character is not a white space */
    buf = xmalloc(strlen(cmd) + 1);
    strcpy(buf, cmd);
    c = buf;
    while (Isspace(*c))
        c++;
    d = c;
    while (!Isspace(*d) && *d)
        d++;
    *d = '\0';

    /* *cmdname is the first word of the command line.  For example,
     *cmdname == "kpsewhich" for
     \write18{kpsewhich --progname=dvipdfm --format="other text files" config}
     */
    *cmdname = xstrdup(c);
    free(buf);

    /* Is *cmdname listed in a texmf.cnf vriable as
       shell_escape_commands = foo,bar,... ? */
    p = cmdlist;
    if (p) {
        while (*p) {
            if (strcmp(*p, *cmdname) == 0) {
                /* *cmdname is found in the list, so restricted shell escape
                   is allowed */
                allow = 2;
                break;
            }
            p++;
        }
    }
    if (allow == 2) {
        spaces = 0;
        for (s = cmd; *s; s++) {
            if (Isspace(*s))
                spaces++;
        }

        /* allocate enough memory (too much?) */
#  ifdef WIN32
        *safecmd = xmalloc(2 * strlen(cmd) + 3 + 2 * spaces);
#  else
        *safecmd = xmalloc(strlen(cmd) + 3 + 2 * spaces);
#  endif

        /* make a safe command line *safecmd */
        s = cmd;
        while (Isspace(*s))
            s++;
        d = *safecmd;
        while (!Isspace(*s) && *s)
            *d++ = *s++;

        pre = 1;
        while (*s) {
            /* Quotation given by a user.  " should always be used; we
               transform it below.  On Unix, if ' is used, simply immediately
               return a quotation error.  */
            if (*s == '\'') {
                return -1;
            }

            if (*s == '"') {
                /* All arguments are quoted as 'foo' (Unix) or "foo" (Windows)
                   before calling system(). Therefore closing QUOTE is necessary
                   if the previous character is not a white space.
                   example:
                   --format="other text files" becomes
                   '--format=''other text files' (Unix)
                   "--format=""other test files" (Windows) */

                if (pre == 0)
                    *d++ = QUOTE;

                pre = 0;
                /* output the quotation mark for the quoted argument */
                *d++ = QUOTE;
                s++;

                while (*s != '"') {
                    /* Illegal use of ', or closing quotation mark is missing */
                    if (*s == '\'' || *s == '\0')
                        return -1;
#  ifdef WIN32
                    if (char_needs_quote(*s))
                        *d++ = '^';
#  endif
                    *d++ = *s++;
                }

                /* Closing quotation mark will be output afterwards, so
                   we do nothing here */
                s++;

                /* The character after the closing quotation mark
                   should be a white space or NULL */
                if (!Isspace(*s) && *s)
                    return -1;

                /* Beginning of a usual argument */
            } else if (pre == 1 && !Isspace(*s)) {
                pre = 0;
                *d++ = QUOTE;
#  ifdef WIN32
                if (char_needs_quote(*s))
                    *d++ = '^';
#  endif
                *d++ = *s++;
                /* Ending of a usual argument */

            } else if (pre == 0 && Isspace(*s)) {
                pre = 1;
                /* Closing quotation mark */
                *d++ = QUOTE;
                *d++ = *s++;
            } else {
                /* Copy a character from cmd to *safecmd. */
#  ifdef WIN32
                if (char_needs_quote(*s))
                    *d++ = '^';
#  endif
                *d++ = *s++;
            }
        }
        /* End of the command line */
        if (pre == 0) {
            *d++ = QUOTE;
        }
        *d = '\0';
#ifdef WIN32
        {
          char *p, *q, *r;
          p = *safecmd;
          if (strlen (p) > 2 && p[1] == ':' && !IS_DIR_SEP (p[2])) {
              q = xmalloc (strlen (p) + 2);
              q[0] = p[0];
              q[1] = p[1];
              q[2] = '/';
              q[3] = '\0';
              strcat (q, (p + 2));
              free (*safecmd);
              *safecmd = q;
          } else if (!IS_DIR_SEP (p[0]) && !(p[1] == ':' && IS_DIR_SEP (p[2]))) { 
            p = kpse_var_value ("SELFAUTOLOC");
            if (p) {
              r = *safecmd;
              while (*r && !Isspace(*r))
                r++;
              if (*r == '\0')
                q = concatn ("\"", p, "/", *safecmd, "\"", NULL);
              else {
                *r = '\0';
                r++;
                while (*r && Isspace(*r))
                  r++;
                if (*r)
                  q = concatn ("\"", p, "/", *safecmd, "\" ", r, NULL);
                else
                  q = concatn ("\"", p, "/", *safecmd, "\"", NULL);
              }
              free (p);
              free (*safecmd);
              *safecmd = q;
            }
          }
        }
#endif
    }

    return allow;
}

/* We should only be called with shellenabledp == 1.
   Return value:
   -1 if a quotation syntax error.
   0 if CMD is not allowed; given shellenabledp==1, this is because
      shell escapes are restricted and CMD is not allowed.
   1 if shell escapes are not restricted, hence any command is allowed.
   2 if shell escapes are restricted and CMD is allowed.  */

int runsystem(char *cmd)
{
    int allow = 0;
    char *safecmd = NULL;
    char *cmdname = NULL;

    if (shellenabledp <= 0) {
        return 0;
    }

    /* If restrictedshell == 0, any command is allowed. */
    if (restrictedshell == 0) {
        allow = 1;
    } else {
        const char *thecmd = cmd;
        allow = shell_cmd_is_allowed(thecmd, &safecmd, &cmdname);
    }

    if (allow == 1)
        (void) system(cmd);
    else if (allow == 2)
        (void) system(safecmd);

    if (safecmd)
        free(safecmd);
    if (cmdname)
        free(cmdname);

    return allow;
}

#endif


/* What we were invoked as and with.  */
char **argv;
int argc;

/* The C version of what might wind up in |TEX_format_default|.  */
string dump_name;

/* The C version of the jobname, if given. */
const_string c_job_name;

const char *ptexbanner;

/* The entry point: set up for reading the command line, which will
   happen in `topenin', then call the main body.  */

int
#if defined(WIN32) && !defined(__MINGW32__) && defined(DLLPROC)
DLLPROC (int ac, string *av)
#else
main (int ac, string *av)
#endif
{
#  ifdef __EMX__
    _wildcard(&ac, &av);
    _response(&ac, &av);
#  endif

#  ifdef WIN32
    _setmaxstdio(2048);
    SetErrorMode (SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX | SEM_NOOPENFILEERRORBOX);
#  endif

    lua_initialize(ac, av);

    /* Call the real main program.  */
    main_body();

    return EXIT_SUCCESS;
}


/* This is supposed to ``open the terminal for input'', but what we
   really do is copy command line arguments into TeX's or Metafont's
   buffer, so they can handle them.  If nothing is available, or we've
   been called already (and hence, argc==0), we return with
   `last=first'.  */

void topenin(void)
{
    int i;


    buffer[first] = 0;          /* In case there are no arguments.  */

    if (optind < argc) {        /* We have command line arguments.  */
        int k = first;
        for (i = optind; i < argc; i++) {
            char *ptr = &(argv[i][0]);
            /* Don't use strcat, since in Aleph the buffer elements aren't
               single bytes.  */
            while (*ptr) {
                buffer[k++] = (packed_ASCII_code) * (ptr++);
            }
            buffer[k++] = ' ';
        }
        argc = 0;               /* Don't do this again.  */
        buffer[k] = 0;
    }

    /* Find the end of the buffer.  */
    for (last = first; buffer[last]; ++last);

    /* Make `last' be one past the last non-blank character in `buffer'.  */
    /* ??? The test for '\r' should not be necessary.  */
    for (--last; last >= first
         && ISBLANK(buffer[last]) && buffer[last] != '\r'; --last);
    last++;

    /* One more time, this time converting to TeX's internal character
       representation.  */
}

/* IPC for TeX.  By Tom Rokicki for the NeXT; it makes TeX ship out the
   DVI file in a pipe to TeXView so that the output can be displayed
   incrementally.  Shamim Mohamed adapted it for Web2c.  */
#if defined (TeX) && defined (IPC)

# ifdef WIN32
#  include <winsock2.h>
# else
#  include <sys/socket.h>
#  include <fcntl.h>
#  ifndef O_NONBLOCK            /* POSIX */
#    ifdef O_NDELAY             /* BSD */
#      define O_NONBLOCK O_NDELAY
#    else
#      ifdef FNDELAY            /* NeXT */
#        define O_NONBLOCK O_FNDELAY
#      else
what the fcntl ? cannot implement IPC without equivalent for O_NONBLOCK.
#      endif                    /* no FNDELAY */
#    endif                      /* no O_NDELAY */
#  endif                        /* no O_NONBLOCK */
# endif /* !WIN32 */

#  ifndef IPC_PIPE_NAME         /* $HOME is prepended to this.  */
#    define IPC_PIPE_NAME "/.TeXview_Pipe"
#  endif
#  ifndef IPC_SERVER_CMD        /* Command to run to start the server.  */
#    define IPC_SERVER_CMD "open `which TeXview`"
#  endif
    struct msg {
    short namelength;           /* length of auxiliary data */
    int eof;                    /* new eof for dvi file */
#  if 0                         /* see usage of struct msg below */
    char more_data[0];          /* where the rest of the stuff goes */
#  endif
};

static char *ipc_name;
static struct sockaddr *ipc_addr;
static int ipc_addr_len;

static int ipc_make_name(void)
{
    if (ipc_addr_len == 0) {
        string s = getenv("HOME");
        if (s) {
            ipc_addr = (struct sockaddr *) xmalloc(strlen(s) + 40);
            ipc_addr->sa_family = 0;
            ipc_name = ipc_addr->sa_data;
            strcpy(ipc_name, s);
            strcat(ipc_name, IPC_PIPE_NAME);
            ipc_addr_len = strlen(ipc_name) + 3;
        }
    }
    return ipc_addr_len;
}


static int sock = -1;

static int ipc_is_open(void)
{
    return sock >= 0;
}


static void ipc_open_out(void)
{
#ifdef WIN32
  u_long mode = 1;
#endif
#  ifdef IPC_DEBUG
    fputs("tex: Opening socket for IPC output ...\n", stderr);
#  endif
    if (sock >= 0) {
        return;
    }

    if (ipc_make_name() < 0) {
        sock = -1;
        return;
    }

    sock = socket(PF_UNIX, SOCK_STREAM, 0);
    if (sock >= 0) {
        if (connect(sock, ipc_addr, ipc_addr_len) != 0 ||
#ifdef WIN32
        ioctlsocket (sock, FIONBIO, &mode) < 0
#else
        fcntl (sock, F_SETFL, O_NONBLOCK) < 0
#endif
           ) {
            close(sock);
            sock = -1;
            return;
        }
#  ifdef IPC_DEBUG
        fputs("tex: Successfully opened IPC socket.\n", stderr);
#  endif
    }
}


static void ipc_close_out(void)
{
#  ifdef IPC_DEBUG
    fputs("tex: Closing output socket ...\n", stderr);
#  endif
    if (ipc_is_open()) {
        close(sock);
        sock = -1;
    }
}


static void ipc_snd(int n, int is_eof, char *data)
{
    struct {
        struct msg msg;
        char more_data[1024];
    } ourmsg;

#  ifdef IPC_DEBUG
    fputs("tex: Sending message to socket ...\n", stderr);
#  endif
    if (!ipc_is_open()) {
        return;
    }

    ourmsg.msg.namelength = n;
    ourmsg.msg.eof = is_eof;
    if (n) {
        strcpy(ourmsg.more_data, data);
    }
    n += sizeof(struct msg);
#  ifdef IPC_DEBUG
    fputs("tex: Writing to socket...\n", stderr);
#  endif
    if (write(sock, &ourmsg, n) != n) {
        ipc_close_out();
    }
#  ifdef IPC_DEBUG
    fputs("tex: IPC message sent.\n", stderr);
#  endif
}


/* This routine notifies the server if there is an eof, or the filename
   if a new DVI file is starting.  This is the routine called by TeX.  */
void ipcpage(int is_eof)
{
    static boolean begun = false;
    unsigned len = 0;
    string p = NULL;

    if (!begun) {
        string name;            /* Just the filename.  */
        string cwd = xgetcwd();

        ipc_open_out();

        /* Have to pass whole filename to the other end, since it may have
           been started up and running as a daemon, e.g., as with the NeXT
           preview program.  */
	name = static_pdf->file_name;
        p = concat3(cwd, DIR_SEP_STRING, name);
        free(cwd);
        len = strlen(p);
        begun = true;
    }
    ipc_snd(len, is_eof, p);

    if (p) {
        free(p);
    }
}
#endif                          /* TeX && IPC */

/* Normalize quoting of filename -- that is, only quote if there is a space,
   and always use the quote-name-quote style. */
string normalize_quotes(const_string name, const_string mesg)
{
    boolean quoted = false;
    boolean must_quote = (strchr(name, ' ') != NULL);
    /* Leave room for quotes and NUL. */
    string ret = (string) xmalloc((unsigned) strlen(name) + 3);
    string p;
    const_string q;
    p = ret;
    if (must_quote)
        *p++ = '"';
    for (q = name; *q; q++) {
        if (*q == '"')
            quoted = !quoted;
        else
            *p++ = *q;
    }
    if (must_quote)
        *p++ = '"';
    *p = '\0';
    if (quoted) {
        fprintf(stderr, "! Unbalanced quotes in %s %s\n", mesg, name);
        uexit(1);
    }
    return ret;
}


/* All our interrupt handler has to do is set TeX's or Metafont's global
   variable `interrupt'; then they will do everything needed.  */
#ifdef WIN32
/* Win32 doesn't set SIGINT ... */
static BOOL WINAPI catch_interrupt(DWORD arg)
{
    switch (arg) {
    case CTRL_C_EVENT:
    case CTRL_BREAK_EVENT:
        interrupt = 1;
        return TRUE;
    default:
        /* No need to set interrupt as we are exiting anyway */
        return FALSE;
    }
}
#else                           /* not WIN32 */
static RETSIGTYPE catch_interrupt(int arg)
{
    (void) arg;
    interrupt = 1;
#  ifdef OS2
    (void) signal(SIGINT, SIG_ACK);
#  else
    (void) signal(SIGINT, catch_interrupt);
#  endif                        /* not OS2 */
}
#endif                          /* not WIN32 */

/* Besides getting the date and time here, we also set up the interrupt
   handler, for no particularly good reason.  It's just that since the
   `fix_date_and_time' routine is called early on (section 1337 in TeX,
   ``Get the first line of input and prepare to start''), this is as
   good a place as any.  */

void get_date_and_time(int *minutes, int *day, int *month, int *year)
{
    time_t myclock = time((time_t *) 0);
    struct tm *tmptr = localtime(&myclock);

    *minutes = tmptr->tm_hour * 60 + tmptr->tm_min;
    *day = tmptr->tm_mday;
    *month = tmptr->tm_mon + 1;
    *year = tmptr->tm_year + 1900;

    {
#ifdef SA_INTERRUPT
        /* Under SunOS 4.1.x, the default action after return from the
           signal handler is to restart the I/O if nothing has been
           transferred.  The effect on TeX is that interrupts are ignored if
           we are waiting for input.  The following tells the system to
           return EINTR from read() in this case.  From ken@cs.toronto.edu.  */

        struct sigaction a, oa;

        a.sa_handler = catch_interrupt;
        sigemptyset(&a.sa_mask);
        sigaddset(&a.sa_mask, SIGINT);
        a.sa_flags = SA_INTERRUPT;
        sigaction(SIGINT, &a, &oa);
        if (oa.sa_handler != SIG_DFL)
            sigaction(SIGINT, &oa, (struct sigaction *) 0);
#else                           /* no SA_INTERRUPT */
#  ifdef WIN32
        SetConsoleCtrlHandler(catch_interrupt, TRUE);
#  else                         /* not WIN32 */
        RETSIGTYPE(*old_handler) (int);

        old_handler = signal(SIGINT, catch_interrupt);
        if (old_handler != SIG_DFL)
            signal(SIGINT, old_handler);
#  endif                        /* not WIN32 */
#endif                          /* no SA_INTERRUPT */
    }
}

/*
 Getting a high resolution time.
 */
void get_seconds_and_micros(int *seconds, int *micros)
{
#if defined (HAVE_GETTIMEOFDAY)
    struct timeval tv;
    gettimeofday(&tv, NULL);
    *seconds = (int)tv.tv_sec;
    *micros = (int)tv.tv_usec;
#elif defined (HAVE_FTIME)
    struct timeb tb;
    ftime(&tb);
    *seconds = tb.time;
    *micros = tb.millitm * 1000;
#else
    time_t myclock = time((time_t *) NULL);
    *seconds = (int) myclock;
    *micros = 0;
#endif
}

/*
  Generating a better seed numbers
  */
int getrandomseed(void)
{
#if defined (HAVE_GETTIMEOFDAY)
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return (int)(tv.tv_usec + 1000000 * tv.tv_usec);
#elif defined (HAVE_FTIME)
    struct timeb tb;
    ftime(&tb);
    return (tb.millitm + 1000 * tb.time);
#else
    time_t myclock = time((time_t *) NULL);
    struct tm *tmptr = localtime(&myclock);
    return (tmptr->tm_sec + 60 * (tmptr->tm_min + 60 * tmptr->tm_hour));
#endif
}

/* Read a line of input as efficiently as possible while still looking
   like Pascal.  We set `last' to `first' and return `false' if we get
   to eof.  Otherwise, we return `true' and set last = first +
   length(line except trailing whitespace).  */

boolean input_line(FILE * f)
{
    int i = EOF;

#ifdef WIN32
    if (f != Poptr && fileno (f) != fileno (stdin)) {
        long position = ftell (f);

        if (position == 0L) {  /* Detect and skip Byte order marks.  */
            int k1 = getc (f);

            if (k1 != 0xff && k1 != 0xfe && k1 != 0xef)
                rewind (f);
            else {
                int k2 = getc (f);

                if (k2 != 0xff && k2 != 0xfe && k2 != 0xbb)
                    rewind (f);
                else if ((k1 == 0xff && k2 == 0xfe) || /* UTF-16(LE) */
                         (k1 == 0xfe && k2 == 0xff))   /* UTF-16(BE) */
                    ;
                else {
                    int k3 = getc (f);

                    if (k1 == 0xef && k2 == 0xbb && k3 == 0xbf) /* UTF-8 */
                        ;
                    else
                        rewind (f);
                }
            }
        }
    }
#endif
    /* Recognize either LF or CR as a line terminator.  */
    last = first;
    while (last < buf_size && (i = getc(f)) != EOF && i != '\n' && i != '\r')
        buffer[last++] = (packed_ASCII_code) i;

    if (i == EOF && errno != EINTR && last == first)
        return false;

    /* We didn't get the whole line because our buffer was too small.  */
    if (i != EOF && i != '\n' && i != '\r') {
        fprintf(stderr, "! Unable to read an entire line---bufsize=%u.\n",
                (unsigned) buf_size);
        fputs("Please increase buf_size in texmf.cnf.\n", stderr);
        uexit(1);
    }

    buffer[last] = ' ';
    if (last >= max_buf_stack)
        max_buf_stack = last;

    /* If next char is LF of a CRLF, read it.  */
    if (i == '\r') {
        while ((i = getc(f)) == EOF && errno == EINTR);
        if (i != '\n')
            ungetc(i, f);
    }

    /* Trim trailing whitespace.  */
    while (last > first && ISBLANK(buffer[last - 1]))
        --last;

    /* Don't bother using xord if we don't need to.  */

    return true;
}




/* Get the job name to be used, which may have been set from the
   command line. */
str_number getjobname(str_number name)
{
    str_number ret = name;
    if (c_job_name != NULL)
        ret = maketexstring(c_job_name);
    return ret;
}