aboutsummaryrefslogtreecommitdiff
path: root/fixincludes/fixfixes.c
blob: 5616bf149751b65a6df1041bb35fb208282abd89 (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

/*

   Test to see if a particular fix should be applied to a header file.

   Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2009
   Free Software Foundation, Inc.

= = = = = = = = = = = = = = = = = = = = = = = = =

NOTE TO DEVELOPERS

The routines you write here must work closely with fixincl.c.

Here are the rules:

1.  Every test procedure name must be suffixed with "_fix".
    These routines will be referenced from inclhack.def, sans the suffix.

2.  Use the "FIX_PROC_HEAD()" macro _with_ the "_fix" suffix
    (I cannot use the ## magic from ANSI C) for defining your entry point.

3.  Put your test name into the FIXUP_TABLE.

4.  Do not read anything from stdin.  It is closed.

5.  Write to stderr only in the event of a reportable error
    In such an event, call "exit (EXIT_FAILURE)".

6.  You have access to the fixDescList entry for the fix in question.
    This may be useful, for example, if there are interesting strings
    or pre-compiled regular expressions stored there.

= = = = = = = = = = = = = = = = = = = = = = = = =

This file is part of GCC.

GCC 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 3, or (at your option)
any later version.

GCC 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#include "fixlib.h"
#define    GTYPE_SE_CT 1

#ifdef SEPARATE_FIX_PROC
#include "fixincl.x"
#endif

tSCC zNeedsArg[] = "fixincl error:  `%s' needs %s argument (c_fix_arg[%d])\n";

typedef void t_fix_proc (const char *, const char *, tFixDesc *) ;
typedef struct {
    const char*  fix_name;
    t_fix_proc*  fix_proc;
} fix_entry_t;

#define FIXUP_TABLE \
  _FT_( "char_macro_def",   char_macro_def_fix ) \
  _FT_( "char_macro_use",   char_macro_use_fix ) \
  _FT_( "format",           format_fix )         \
  _FT_( "machine_name",     machine_name_fix )   \
  _FT_( "wrap",             wrap_fix )           \
  _FT_( "gnu_type",         gnu_type_fix )


#define FIX_PROC_HEAD( fix )	\
static void fix (const char* filname ATTRIBUTE_UNUSED , \
                 const char* text ATTRIBUTE_UNUSED , \
                 tFixDesc* p_fixd ATTRIBUTE_UNUSED )

#ifdef NEED_PRINT_QUOTE
/*
 *  Skip over a quoted string.  Single quote strings may
 *  contain multiple characters if the first character is
 *  a backslash.  Especially a backslash followed by octal digits.
 *  We are not doing a correctness syntax check here.
 */
static char*
print_quote(char q, char* text )
{
  fputc( q, stdout );

  for (;;)
    {
      char ch = *(text++);
      fputc( ch, stdout );

      switch (ch)
        {
        case '\\':
          if (*text == NUL)
            goto quote_done;

          fputc( *(text++), stdout );
          break;

        case '"':
        case '\'':
          if (ch != q)
            break;
          /*FALLTHROUGH*/

        case '\n':
        case NUL:
          goto quote_done;
        }
    } quote_done:;

  return text;
}
#endif /* NEED_PRINT_QUOTE */


/*
 *  Emit the GNU standard type wrapped up in such a way that
 *  this thing can be encountered countless times during a compile
 *  and not cause even a warning.
 */
static const char*
emit_gnu_type (const char* text, regmatch_t* rm )
{
  char z_TYPE[ 64 ];
  char z_type[ 64 ];

  fwrite (text, rm[0].rm_so, 1, stdout);

  {
    const char* ps = text   + rm[1].rm_so;
    const char* pe = text   + rm[1].rm_eo;
    char* pd = z_type;
    char* pD = z_TYPE;

    while (ps < pe)
      *(pD++) = TOUPPER( *(pd++) = *(ps++) );

    *pD = *pd = NUL;
  }

  /*
   *  Now print out the reformed typedef,
   *  with a C++ guard for WCHAR
   */
  {
    tSCC z_fmt[] = "\
#if !defined(_GCC_%s_T)%s\n\
#define _GCC_%s_T\n\
typedef __%s_TYPE__ %s_t;\n\
#endif\n";

    const char *const pz_guard = (strcmp (z_type, "wchar") == 0)
                           ? " && ! defined(__cplusplus)" : "";

    printf (z_fmt, z_TYPE, pz_guard, z_TYPE, z_TYPE, z_type);
  }

  return text += rm[0].rm_eo;
}


/*
 *  Copy the `format' string to std out, replacing `%n' expressions
 *  with the matched text from a regular expression evaluation.
 *  Doubled '%' characters will be replaced with a single copy.
 *  '%' characters in other contexts and all other characters are
 *  copied out verbatim.
 */
static void
format_write (tCC* format, tCC* text, regmatch_t av[] )
{
  int c;

  while ((c = (unsigned)*(format++)) != NUL) {

    if (c != '%')
      {
        putchar(c);
        continue;
      }

    c = (unsigned)*(format++);

    /*
     *  IF the character following a '%' is not a digit,
     *  THEN we will always emit a '%' and we may or may
     *  not emit the following character.  We will end on
     *  a NUL and we will emit only one of a pair of '%'.
     */
    if (! ISDIGIT ( c ))
      {
        putchar( '%' );
        switch (c) {
        case NUL:
          return;
        case '%':
          break;
        default:
          putchar(c);
        }
      }

    /*
     *  Emit the matched subexpression numbered 'c'.
     *  IF, of course, there was such a match...
     */
    else {
      regmatch_t*  pRM = av + (c - (unsigned)'0');
      size_t len;

      if (pRM->rm_so < 0)
        continue;

      len = pRM->rm_eo - pRM->rm_so;
      if (len > 0)
        fwrite(text + pRM->rm_so, len, 1, stdout);
    }
  }
}


/*
 *  Search for multiple copies of a regular expression.  Each block
 *  of matched text is replaced with the format string, as described
 *  above in `format_write'.
 */
FIX_PROC_HEAD( format_fix )
{
  tCC*  pz_pat = p_fixd->patch_args[2];
  tCC*  pz_fmt = p_fixd->patch_args[1];
  regex_t re;
  regmatch_t rm[10];
  IGNORE_ARG(filname);

  /*
   *  We must have a format
   */
  if (pz_fmt == (tCC*)NULL)
    {
      fprintf( stderr, zNeedsArg, p_fixd->fix_name, "replacement format", 0 );
      exit (EXIT_BROKEN);
    }

  /*
   *  IF we don't have a search text, then go find the first
   *  regular expression among the tests.
   */
  if (pz_pat == (tCC*)NULL)
    {
      tTestDesc* pTD = p_fixd->p_test_desc;
      int        ct  = p_fixd->test_ct;
      for (;;)
        {
          if (ct-- <= 0)
            {
              fprintf( stderr, zNeedsArg, p_fixd->fix_name, "search text", 1 );
              exit (EXIT_BROKEN);
            }

          if (pTD->type == TT_EGREP)
            {
              pz_pat = pTD->pz_test_text;
              break;
            }

          pTD++;
        }
    }

  /*
   *  Replace every copy of the text we find
   */
  compile_re (pz_pat, &re, 1, "format search-text", "format_fix" );
  while (xregexec (&re, text, 10, rm, 0) == 0)
    {
      fwrite( text, rm[0].rm_so, 1, stdout );
      format_write( pz_fmt, text, rm );
      text += rm[0].rm_eo;
    }

  /*
   *  Dump out the rest of the file
   */
  fputs (text, stdout);
}


/* Scan the input file for all occurrences of text like this:

   #define TIOCCONS _IO(T, 12)

   and change them to read like this:

   #define TIOCCONS _IO('T', 12)

   which is the required syntax per the C standard.  (The definition of
   _IO also has to be tweaked - see below.)  'IO' is actually whatever you
   provide as the `c_fix_arg' argument.  */

FIX_PROC_HEAD( char_macro_use_fix )
{
  /* This regexp looks for a traditional-syntax #define (# in column 1)
     of an object-like macro.  */
  static const char pat[] =
    "^#[ \t]*define[ \t]+[_A-Za-z][_A-Za-z0-9]*[ \t]+";
  static regex_t re;

  const char* str = p_fixd->patch_args[1];
  regmatch_t rm[1];
  const char *p, *limit;
  size_t len;
  IGNORE_ARG(filname);

  if (str == NULL)
    {
      fprintf (stderr, zNeedsArg, p_fixd->fix_name, "ioctl type", 0);
      exit (EXIT_BROKEN);
    }

  len = strlen (str);
  compile_re (pat, &re, 1, "macro pattern", "char_macro_use_fix");

  for (p = text;
       xregexec (&re, p, 1, rm, 0) == 0;
       p = limit + 1)
    {
      /* p + rm[0].rm_eo is the first character of the macro replacement.
	 Find the end of the macro replacement, and the STR we were
	 sent to look for within the replacement.  */
      p += rm[0].rm_eo;
      limit = p - 1;
      do
	{
	  limit = strchr (limit + 1, '\n');
	  if (!limit)
	    goto done;
	}
      while (limit[-1] == '\\');

      do
	{
	  if (*p == str[0] && !strncmp (p+1, str+1, len-1))
	    goto found;
	}
      while (++p < limit - len);
      /* Hit end of line.  */
      continue;

    found:
      /* Found STR on this line.  If the macro needs fixing,
	 the next few chars will be whitespace or uppercase,
	 then an open paren, then a single letter.  */
      while ((ISSPACE (*p) || ISUPPER (*p)) && p < limit) p++;
      if (*p++ != '(')
	continue;
      if (!ISALPHA (*p))
	continue;
      if (ISIDNUM (p[1]))
	continue;

      /* Splat all preceding text into the output buffer,
	 quote the character at p, then proceed.  */
      fwrite (text, 1, p - text, stdout);
      putchar ('\'');
      putchar (*p);
      putchar ('\'');
      text = p + 1;
    }
 done:
  fputs (text, stdout);
}


/* Scan the input file for all occurrences of text like this:

   #define xxxIOxx(x, y) (....'x'<<16....)

   and change them to read like this:

   #define xxxIOxx(x, y) (....x<<16....)

   which is the required syntax per the C standard.  (The uses of _IO
   also has to be tweaked - see above.)  'IO' is actually whatever
   you provide as the `c_fix_arg' argument.  */
FIX_PROC_HEAD( char_macro_def_fix )
{
  /* This regexp looks for any traditional-syntax #define (# in column 1).  */
  static const char pat[] =
    "^#[ \t]*define[ \t]+";
  static regex_t re;

  const char* str = p_fixd->patch_args[1];
  regmatch_t rm[1];
  const char *p, *limit;
  char arg;
  size_t len;
  IGNORE_ARG(filname);

  if (str == NULL)
    {
      fprintf (stderr, zNeedsArg, p_fixd->fix_name, "ioctl type", 0);
      exit (EXIT_BROKEN);
    }

  len = strlen (str);
  compile_re (pat, &re, 1, "macro pattern", "fix_char_macro_defines");

  for (p = text;
       xregexec (&re, p, 1, rm, 0) == 0;
       p = limit + 1)
    {
      /* p + rm[0].rm_eo is the first character of the macro name.
	 Find the end of the macro replacement, and the STR we were
	 sent to look for within the name.  */
      p += rm[0].rm_eo;
      limit = p - 1;
      do
	{
	  limit = strchr (limit + 1, '\n');
	  if (!limit)
	    goto done;
	}
      while (limit[-1] == '\\');

      do
	{
	  if (*p == str[0] && !strncmp (p+1, str+1, len-1))
	    goto found;
	  p++;
	}
      while (ISIDNUM (*p));
      /* Hit end of macro name without finding the string.  */
      continue;

    found:
      /* Found STR in this macro name.  If the macro needs fixing,
	 there may be a few uppercase letters, then there will be an
	 open paren with _no_ intervening whitespace, and then a
	 single letter.  */
      while (ISUPPER (*p) && p < limit) p++;
      if (*p++ != '(')
	continue;
      if (!ISALPHA (*p))
	continue;
      if (ISIDNUM (p[1]))
	continue;

      /* The character at P is the one to look for in the following
	 text.  */
      arg = *p;
      p += 2;

      while (p < limit)
	{
	  if (p[-1] == '\'' && p[0] == arg && p[1] == '\'')
	    {
	      /* Remove the quotes from this use of ARG.  */
	      p--;
	      fwrite (text, 1, p - text, stdout);
	      putchar (arg);
	      p += 3;
	      text = p;
	    }
	  else
	    p++;
	}
    }
 done:
  fputs (text, stdout);
}

/* Fix for machine name #ifdefs that are not in the namespace reserved
   by the C standard.  They won't be defined if compiling with -ansi,
   and the headers will break.  We go to some trouble to only change
   #ifdefs where the macro is defined by GCC in non-ansi mode; this
   minimizes the number of headers touched.  */

#define SCRATCHSZ 64   /* hopefully long enough */

FIX_PROC_HEAD( machine_name_fix )
{
  regmatch_t match[2];
  const char *line, *base, *limit, *p, *q;
  regex_t *label_re, *name_re;
  char scratch[SCRATCHSZ];
  size_t len;
  IGNORE_ARG(filname);
  IGNORE_ARG(p_fixd);

  if (!mn_get_regexps (&label_re, &name_re, "machine_name_fix"))
    {
      fputs( "The target machine has no needed machine name fixes\n", stderr );
      goto done;
    }

  scratch[0] = '_';
  scratch[1] = '_';

  for (base = text;
       xregexec (label_re, base, 2, match, 0) == 0;
       base = limit)
    {
      base += match[0].rm_eo;
      /* We're looking at an #if or #ifdef.  Scan forward for the
         next non-escaped newline.  */
      line = limit = base;
      do
        {
          limit++;
          limit = strchr (limit, '\n');
          if (!limit)
            goto done;
        }
      while (limit[-1] == '\\');

      /* If the 'name_pat' matches in between base and limit, we have
         a bogon.  It is not worth the hassle of excluding comments
         because comments on #if/#ifdef lines are rare, and strings on
         such lines are illegal.

         REG_NOTBOL means 'base' is not at the beginning of a line, which
         shouldn't matter since the name_re has no ^ anchor, but let's
         be accurate anyway.  */

      for (;;)
        {
        again:
          if (base == limit)
            break;

          if (xregexec (name_re, base, 1, match, REG_NOTBOL))
            goto done;  /* No remaining match in this file */

          /* Match; is it on the line?  */
          if (match[0].rm_eo > limit - base)
            break;

          p = base + match[0].rm_so;
          base += match[0].rm_eo;

          /* One more test: if on the same line we have the same string
             with the appropriate underscores, then leave it alone.
             We want exactly two leading and trailing underscores.  */
          if (*p == '_')
            {
              len = base - p - ((*base == '_') ? 2 : 1);
              q = p + 1;
            }
          else
            {
              len = base - p - ((*base == '_') ? 1 : 0);
              q = p;
            }
          if (len + 4 > SCRATCHSZ)
            abort ();
          memcpy (&scratch[2], q, len);
          len += 2;
          scratch[len++] = '_';
          scratch[len++] = '_';

          for (q = line; q <= limit - len; q++)
            if (*q == '_' && !strncmp (q, scratch, len))
              goto again;
          
          fwrite (text, 1, p - text, stdout);
          fwrite (scratch, 1, len, stdout);

          text = base;
        }
    }
 done:
  fputs (text, stdout);
}


FIX_PROC_HEAD( wrap_fix )
{
  tSCC   z_no_wrap_pat[] = "^#if.*__need_";
  static regex_t no_wrapping_re; /* assume zeroed data */

  tCC*   pz_name = NULL;

  if (no_wrapping_re.allocated == 0)
    compile_re( z_no_wrap_pat, &no_wrapping_re, 0, "no-wrap pattern",
                "wrap-fix" );

  /*
   *  IF we do *not* match the no-wrap re, then we have a double negative.
   *  A double negative means YES.
   */
  if (xregexec( &no_wrapping_re, text, 0, NULL, 0 ) != 0)
    {
      /*
       *  A single file can get wrapped more than once by different fixes.
       *  A single fix can wrap multiple files.  Therefore, guard with
       *  *both* the fix name and the file name.
       */
      size_t ln = strlen( filname ) + strlen( p_fixd->fix_name ) + 14;
      char*  pz = XNEWVEC (char, ln);
      pz_name = pz;
      sprintf( pz, "FIXINC_WRAP_%s-%s", filname, p_fixd->fix_name );

      for (pz += 12; 1; pz++) {
        char ch = *pz;

        if (ch == NUL)
          break;

        if (! ISALNUM( ch )) {
          *pz = '_';
        }
        else {
          *pz = TOUPPER( ch );
        }
      }

      printf( "#ifndef %s\n", pz_name );
      printf( "#define %s 1\n\n", pz_name );
    }

  if (p_fixd->patch_args[1] == (tCC*)NULL)
    fputs( text, stdout );

  else {
    fputs( p_fixd->patch_args[1], stdout );
    fputs( text, stdout );
    if (p_fixd->patch_args[2] != (tCC*)NULL)
      fputs( p_fixd->patch_args[2], stdout );
  }

  if (pz_name != NULL) {
    printf( "\n#endif  /* %s */\n", pz_name );
    free( (void*)pz_name );
  }
}


/*
 *  Search for multiple copies of a regular expression.  Each block
 *  of matched text is replaced with the format string, as described
 *  above in `format_write'.
 */
FIX_PROC_HEAD( gnu_type_fix )
{
  const char* pz_pat;
  regex_t    re;
  regmatch_t rm[GTYPE_SE_CT+1];
  IGNORE_ARG(filname);

  {
    tTestDesc* pTD = p_fixd->p_test_desc;
    int        ct  = p_fixd->test_ct;
    for (;;)
      {
        if (ct-- <= 0)
          {
            fprintf (stderr, zNeedsArg, p_fixd->fix_name, "search text", 1);
            exit (EXIT_BROKEN);
          }

        if (pTD->type == TT_EGREP)
          {
            pz_pat = pTD->pz_test_text;
            break;
          }

        pTD++;
      }
  }

  compile_re (pz_pat, &re, 1, "gnu type typedef", "gnu_type_fix");

  while (xregexec (&re, text, GTYPE_SE_CT+1, rm, 0) == 0)
    {
      text = emit_gnu_type (text, rm);
    }

  /*
   *  Dump out the rest of the file
   */
  fputs (text, stdout);
}


/* = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

     test for fix selector

     THIS IS THE ONLY EXPORTED ROUTINE

*/
void
apply_fix( tFixDesc* p_fixd, tCC* filname )
{
#define _FT_(n,p) { n, p },
  static fix_entry_t fix_table[] = { FIXUP_TABLE { NULL, NULL }};
#undef _FT_
#define FIX_TABLE_CT (ARRAY_SIZE (fix_table)-1)

  tCC* fixname = p_fixd->patch_args[0];
  char* buf;
  int ct = FIX_TABLE_CT;
  fix_entry_t* pfe = fix_table;

  for (;;)
    {
      if (strcmp (pfe->fix_name, fixname) == 0)
        break;
      if (--ct <= 0)
        {
          fprintf (stderr, "fixincl error:  the `%s' fix is unknown\n",
                   fixname );
          exit (EXIT_BROKEN);
        }
      pfe++;
    }

  buf = load_file_data (stdin);
  (*pfe->fix_proc)( filname, buf, p_fixd );
}

#ifdef SEPARATE_FIX_PROC
tSCC z_usage[] =
"USAGE: applyfix <fix-name> <file-to-fix> <file-source> <file-destination>\n";
tSCC z_reopen[] =
"FS error %d (%s) reopening %s as std%s\n";

int
main( int argc, char** argv )
{
  tFixDesc* pFix;
  char* pz_tmptmp;
  char* pz_tmp_base;
  char* pz_tmp_dot;

  if (argc != 5)
    {
    usage_failure:
      fputs (z_usage, stderr);
      return EXIT_FAILURE;
    }

  initialize_opts ();

  {
    char* pz = argv[1];
    long  idx;

    if (! ISDIGIT ( *pz ))
      goto usage_failure;

    idx = strtol (pz, &pz, 10);
    if ((*pz != NUL) || ((unsigned)idx >= FIX_COUNT))
      goto usage_failure;
    pFix = fixDescList + idx;
  }

  if (freopen (argv[3], "r", stdin) != stdin)
    {
      fprintf (stderr, z_reopen, errno, strerror( errno ), argv[3], "in");
      return EXIT_FAILURE;
    }

  pz_tmptmp = XNEWVEC (char, strlen (argv[4]) + 5);
  strcpy( pz_tmptmp, argv[4] );

  /* Don't lose because "12345678" and "12345678X" map to the same
     file under DOS restricted 8+3 file namespace.  Note that DOS
     doesn't allow more than one dot in the trunk of a file name.  */
  pz_tmp_base = basename( pz_tmptmp );
  pz_tmp_dot = strchr( pz_tmp_base, '.' );
#ifdef _PC_NAME_MAX
  if (pathconf( pz_tmptmp, _PC_NAME_MAX ) <= 12	/* is this DOS or Windows9X? */
      && pz_tmp_dot != (char*)NULL)
    strcpy (pz_tmp_dot+1, "X"); /* nuke the original extension */
  else
#endif /* _PC_NAME_MAX */
    strcat (pz_tmptmp, ".X");
  if (freopen (pz_tmptmp, "w", stdout) != stdout)
    {
      fprintf (stderr, z_reopen, errno, strerror( errno ), pz_tmptmp, "out");
      return EXIT_FAILURE;
    }

  apply_fix (pFix, argv[1]);
  fclose (stdout);
  fclose (stdin);
  unlink (argv[4]);
  if (rename (pz_tmptmp, argv[4]) != 0)
    {
      fprintf (stderr, "error %d (%s) renaming %s to %s\n", errno,
               strerror( errno ), pz_tmptmp, argv[4]);
      return EXIT_FAILURE;
    }

  return EXIT_SUCCESS;
}
#endif