fixincludes/fixfixes.c

   1
   2 /*
   3
   4    Test to see if a particular fix should be applied to a header file.
   5
   6    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2009
   7    Free Software Foundation, Inc.
   8
   9 = = = = = = = = = = = = = = = = = = = = = = = = =
  10
  11 NOTE TO DEVELOPERS
  12
  13 The routines you write here must work closely with fixincl.c.
  14
  15 Here are the rules:
  16
  17 1.  Every test procedure name must be suffixed with "_fix".
  18     These routines will be referenced from inclhack.def, sans the suffix.
  19
  20 2.  Use the "FIX_PROC_HEAD()" macro _with_ the "_fix" suffix
  21     (I cannot use the ## magic from ANSI C) for defining your entry point.
  22
  23 3.  Put your test name into the FIXUP_TABLE.
  24
  25 4.  Do not read anything from stdin.  It is closed.
  26
  27 5.  Write to stderr only in the event of a reportable error
  28     In such an event, call "exit (EXIT_FAILURE)".
  29
  30 6.  You have access to the fixDescList entry for the fix in question.
  31     This may be useful, for example, if there are interesting strings
  32     or pre-compiled regular expressions stored there.
  33
  34 = = = = = = = = = = = = = = = = = = = = = = = = =
  35
  36 This file is part of GCC.
  37
  38 GCC is free software; you can redistribute it and/or modify
  39 it under the terms of the GNU General Public License as published by
  40 the Free Software Foundation; either version 3, or (at your option)
  41 any later version.
  42
  43 GCC is distributed in the hope that it will be useful,
  44 but WITHOUT ANY WARRANTY; without even the implied warranty of
  45 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  46 GNU General Public License for more details.
  47
  48 You should have received a copy of the GNU General Public License
  49 along with GCC; see the file COPYING3.  If not see
  50 <http://www.gnu.org/licenses/>.  */
  51
  52 #include "fixlib.h"
  53 #define    GTYPE_SE_CT 1
  54
  55 #ifdef SEPARATE_FIX_PROC
  56 #include "fixincl.x"
  57 #endif
  58
  59 tSCC zNeedsArg[] = "fixincl error:  `%s' needs %s argument (c_fix_arg[%d])\n";
  60
  61 typedef void t_fix_proc (const char *, const char *, tFixDesc *) ;
  62 typedef struct {
  63     const char*  fix_name;
  64     t_fix_proc*  fix_proc;
  65 } fix_entry_t;
  66
  67 #define FIXUP_TABLE \
  68   _FT_( "char_macro_def",   char_macro_def_fix ) \
  69   _FT_( "char_macro_use",   char_macro_use_fix ) \
  70   _FT_( "format",           format_fix )         \
  71   _FT_( "machine_name",     machine_name_fix )   \
  72   _FT_( "wrap",             wrap_fix )           \
  73   _FT_( "gnu_type",         gnu_type_fix )
  74
  75
  76 #define FIX_PROC_HEAD( fix )    \
  77 static void fix (const char* filname ATTRIBUTE_UNUSED , \
  78                  const char* text ATTRIBUTE_UNUSED , \
  79                  tFixDesc* p_fixd ATTRIBUTE_UNUSED )
  80
  81 #ifdef NEED_PRINT_QUOTE
  82 /*
  83  *  Skip over a quoted string.  Single quote strings may
  84  *  contain multiple characters if the first character is
  85  *  a backslash.  Especially a backslash followed by octal digits.
  86  *  We are not doing a correctness syntax check here.
  87  */
  88 static char*
  89 print_quote(char q, char* text )
  90 {
  91   fputc( q, stdout );
  92
  93   for (;;)
  94     {
  95       char ch = *(text++);
  96       fputc( ch, stdout );
  97
  98       switch (ch)
  99         {
 100         case '\\':
 101           if (*text == NUL)
 102             goto quote_done;
 103
 104           fputc( *(text++), stdout );
 105           break;
 106
 107         case '"':
 108         case '\'':
 109           if (ch != q)
 110             break;
 111           /*FALLTHROUGH*/
 112
 113         case '\n':
 114         case NUL:
 115           goto quote_done;
 116         }
 117     } quote_done:;
 118
 119   return text;
 120 }
 121 #endif /* NEED_PRINT_QUOTE */
 122
 123
 124 /*
 125  *  Emit the GNU standard type wrapped up in such a way that
 126  *  this thing can be encountered countless times during a compile
 127  *  and not cause even a warning.
 128  */
 129 static const char*
 130 emit_gnu_type (const char* text, regmatch_t* rm )
 131 {
 132   char z_TYPE[ 64 ];
 133   char z_type[ 64 ];
 134
 135   fwrite (text, rm[0].rm_so, 1, stdout);
 136
 137   {
 138     const char* ps = text   + rm[1].rm_so;
 139     const char* pe = text   + rm[1].rm_eo;
 140     char* pd = z_type;
 141     char* pD = z_TYPE;
 142
 143     while (ps < pe)
 144       *(pD++) = TOUPPER( *(pd++) = *(ps++) );
 145
 146     *pD = *pd = NUL;
 147   }
 148
 149   /*
 150    *  Now print out the reformed typedef,
 151    *  with a C++ guard for WCHAR
 152    */
 153   {
 154     tSCC z_fmt[] = "\
 155 #if !defined(_GCC_%s_T)%s\n\
 156 #define _GCC_%s_T\n\
 157 typedef __%s_TYPE__ %s_t;\n\
 158 #endif\n";
 159
 160     const char *const pz_guard = (strcmp (z_type, "wchar") == 0)
 161                            ? " && ! defined(__cplusplus)" : "";
 162
 163     printf (z_fmt, z_TYPE, pz_guard, z_TYPE, z_TYPE, z_type);
 164   }
 165
 166   return text += rm[0].rm_eo;
 167 }
 168
 169
 170 /*
 171  *  Copy the `format' string to std out, replacing `%n' expressions
 172  *  with the matched text from a regular expression evaluation.
 173  *  Doubled '%' characters will be replaced with a single copy.
 174  *  '%' characters in other contexts and all other characters are
 175  *  copied out verbatim.
 176  */
 177 static void
 178 format_write (tCC* format, tCC* text, regmatch_t av[] )
 179 {
 180   int c;
 181
 182   while ((c = (unsigned)*(format++)) != NUL) {
 183
 184     if (c != '%')
 185       {
 186         putchar(c);
 187         continue;
 188       }
 189
 190     c = (unsigned)*(format++);
 191
 192     /*
 193      *  IF the character following a '%' is not a digit,
 194      *  THEN we will always emit a '%' and we may or may
 195      *  not emit the following character.  We will end on
 196      *  a NUL and we will emit only one of a pair of '%'.
 197      */
 198     if (! ISDIGIT ( c ))
 199       {
 200         putchar( '%' );
 201         switch (c) {
 202         case NUL:
 203           return;
 204         case '%':
 205           break;
 206         default:
 207           putchar(c);
 208         }
 209       }
 210
 211     /*
 212      *  Emit the matched subexpression numbered 'c'.
 213      *  IF, of course, there was such a match...
 214      */
 215     else {
 216       regmatch_t*  pRM = av + (c - (unsigned)'0');
 217       size_t len;
 218
 219       if (pRM->rm_so < 0)
 220         continue;
 221
 222       len = pRM->rm_eo - pRM->rm_so;
 223       if (len > 0)
 224         fwrite(text + pRM->rm_so, len, 1, stdout);
 225     }
 226   }
 227 }
 228
 229
 230 /*
 231  *  Search for multiple copies of a regular expression.  Each block
 232  *  of matched text is replaced with the format string, as described
 233  *  above in `format_write'.
 234  */
 235 FIX_PROC_HEAD( format_fix )
 236 {
 237   tCC*  pz_pat = p_fixd->patch_args[2];
 238   tCC*  pz_fmt = p_fixd->patch_args[1];
 239   regex_t re;
 240   regmatch_t rm[10];
 241   IGNORE_ARG(filname);
 242
 243   /*
 244    *  We must have a format
 245    */
 246   if (pz_fmt == (tCC*)NULL)
 247     {
 248       fprintf( stderr, zNeedsArg, p_fixd->fix_name, "replacement format", 0 );
 249       exit (EXIT_BROKEN);
 250     }
 251
 252   /*
 253    *  IF we don't have a search text, then go find the first
 254    *  regular expression among the tests.
 255    */
 256   if (pz_pat == (tCC*)NULL)
 257     {
 258       tTestDesc* pTD = p_fixd->p_test_desc;
 259       int        ct  = p_fixd->test_ct;
 260       for (;;)
 261         {
 262           if (ct-- <= 0)
 263             {
 264               fprintf( stderr, zNeedsArg, p_fixd->fix_name, "search text", 1 );
 265               exit (EXIT_BROKEN);
 266             }
 267
 268           if (pTD->type == TT_EGREP)
 269             {
 270               pz_pat = pTD->pz_test_text;
 271               break;
 272             }
 273
 274           pTD++;
 275         }
 276     }
 277
 278   /*
 279    *  Replace every copy of the text we find
 280    */
 281   compile_re (pz_pat, &re, 1, "format search-text", "format_fix" );
 282   while (xregexec (&re, text, 10, rm, 0) == 0)
 283     {
 284       fwrite( text, rm[0].rm_so, 1, stdout );
 285       format_write( pz_fmt, text, rm );
 286       text += rm[0].rm_eo;
 287     }
 288
 289   /*
 290    *  Dump out the rest of the file
 291    */
 292   fputs (text, stdout);
 293 }
 294
 295
 296 /* Scan the input file for all occurrences of text like this:
 297
 298    #define TIOCCONS _IO(T, 12)
 299
 300    and change them to read like this:
 301
 302    #define TIOCCONS _IO('T', 12)
 303
 304    which is the required syntax per the C standard.  (The definition of
 305    _IO also has to be tweaked - see below.)  'IO' is actually whatever you
 306    provide as the `c_fix_arg' argument.  */
 307
 308 FIX_PROC_HEAD( char_macro_use_fix )
 309 {
 310   /* This regexp looks for a traditional-syntax #define (# in column 1)
 311      of an object-like macro.  */
 312   static const char pat[] =
 313     "^#[ \t]*define[ \t]+[_A-Za-z][_A-Za-z0-9]*[ \t]+";
 314   static regex_t re;
 315
 316   const char* str = p_fixd->patch_args[1];
 317   regmatch_t rm[1];
 318   const char *p, *limit;
 319   size_t len;
 320   IGNORE_ARG(filname);
 321
 322   if (str == NULL)
 323     {
 324       fprintf (stderr, zNeedsArg, p_fixd->fix_name, "ioctl type", 0);
 325       exit (EXIT_BROKEN);
 326     }
 327
 328   len = strlen (str);
 329   compile_re (pat, &re, 1, "macro pattern", "char_macro_use_fix");
 330
 331   for (p = text;
 332        xregexec (&re, p, 1, rm, 0) == 0;
 333        p = limit + 1)
 334     {
 335       /* p + rm[0].rm_eo is the first character of the macro replacement.
 336          Find the end of the macro replacement, and the STR we were
 337          sent to look for within the replacement.  */
 338       p += rm[0].rm_eo;
 339       limit = p - 1;
 340       do
 341         {
 342           limit = strchr (limit + 1, '\n');
 343           if (!limit)
 344             goto done;
 345         }
 346       while (limit[-1] == '\\');
 347
 348       do
 349         {
 350           if (*p == str[0] && !strncmp (p+1, str+1, len-1))
 351             goto found;
 352         }
 353       while (++p < limit - len);
 354       /* Hit end of line.  */
 355       continue;
 356
 357     found:
 358       /* Found STR on this line.  If the macro needs fixing,
 359          the next few chars will be whitespace or uppercase,
 360          then an open paren, then a single letter.  */
 361       while ((ISSPACE (*p) || ISUPPER (*p)) && p < limit) p++;
 362       if (*p++ != '(')
 363         continue;
 364       if (!ISALPHA (*p))
 365         continue;
 366       if (ISIDNUM (p[1]))
 367         continue;
 368
 369       /* Splat all preceding text into the output buffer,
 370          quote the character at p, then proceed.  */
 371       fwrite (text, 1, p - text, stdout);
 372       putchar ('\'');
 373       putchar (*p);
 374       putchar ('\'');
 375       text = p + 1;
 376     }
 377  done:
 378   fputs (text, stdout);
 379 }
 380
 381
 382 /* Scan the input file for all occurrences of text like this:
 383
 384    #define xxxIOxx(x, y) (....'x'<<16....)
 385
 386    and change them to read like this:
 387
 388    #define xxxIOxx(x, y) (....x<<16....)
 389
 390    which is the required syntax per the C standard.  (The uses of _IO
 391    also has to be tweaked - see above.)  'IO' is actually whatever
 392    you provide as the `c_fix_arg' argument.  */
 393 FIX_PROC_HEAD( char_macro_def_fix )
 394 {
 395   /* This regexp looks for any traditional-syntax #define (# in column 1).  */
 396   static const char pat[] =
 397     "^#[ \t]*define[ \t]+";
 398   static regex_t re;
 399
 400   const char* str = p_fixd->patch_args[1];
 401   regmatch_t rm[1];
 402   const char *p, *limit;
 403   char arg;
 404   size_t len;
 405   IGNORE_ARG(filname);
 406
 407   if (str == NULL)
 408     {
 409       fprintf (stderr, zNeedsArg, p_fixd->fix_name, "ioctl type", 0);
 410       exit (EXIT_BROKEN);
 411     }
 412
 413   len = strlen (str);
 414   compile_re (pat, &re, 1, "macro pattern", "fix_char_macro_defines");
 415
 416   for (p = text;
 417        xregexec (&re, p, 1, rm, 0) == 0;
 418        p = limit + 1)
 419     {
 420       /* p + rm[0].rm_eo is the first character of the macro name.
 421          Find the end of the macro replacement, and the STR we were
 422          sent to look for within the name.  */
 423       p += rm[0].rm_eo;
 424       limit = p - 1;
 425       do
 426         {
 427           limit = strchr (limit + 1, '\n');
 428           if (!limit)
 429             goto done;
 430         }
 431       while (limit[-1] == '\\');
 432
 433       do
 434         {
 435           if (*p == str[0] && !strncmp (p+1, str+1, len-1))
 436             goto found;
 437           p++;
 438         }
 439       while (ISIDNUM (*p));
 440       /* Hit end of macro name without finding the string.  */
 441       continue;
 442
 443     found:
 444       /* Found STR in this macro name.  If the macro needs fixing,
 445          there may be a few uppercase letters, then there will be an
 446          open paren with _no_ intervening whitespace, and then a
 447          single letter.  */
 448       while (ISUPPER (*p) && p < limit) p++;
 449       if (*p++ != '(')
 450         continue;
 451       if (!ISALPHA (*p))
 452         continue;
 453       if (ISIDNUM (p[1]))
 454         continue;
 455
 456       /* The character at P is the one to look for in the following
 457          text.  */
 458       arg = *p;
 459       p += 2;
 460
 461       while (p < limit)
 462         {
 463           if (p[-1] == '\'' && p[0] == arg && p[1] == '\'')
 464             {
 465               /* Remove the quotes from this use of ARG.  */
 466               p--;
 467               fwrite (text, 1, p - text, stdout);
 468               putchar (arg);
 469               p += 3;
 470               text = p;
 471             }
 472           else
 473             p++;
 474         }
 475     }
 476  done:
 477   fputs (text, stdout);
 478 }
 479
 480 /* Fix for machine name #ifdefs that are not in the namespace reserved
 481    by the C standard.  They won't be defined if compiling with -ansi,
 482    and the headers will break.  We go to some trouble to only change
 483    #ifdefs where the macro is defined by GCC in non-ansi mode; this
 484    minimizes the number of headers touched.  */
 485
 486 #define SCRATCHSZ 64   /* hopefully long enough */
 487
 488 FIX_PROC_HEAD( machine_name_fix )
 489 {
 490   regmatch_t match[2];
 491   const char *line, *base, *limit, *p, *q;
 492   regex_t *label_re, *name_re;
 493   char scratch[SCRATCHSZ];
 494   size_t len;
 495   IGNORE_ARG(filname);
 496   IGNORE_ARG(p_fixd);
 497
 498   if (!mn_get_regexps (&label_re, &name_re, "machine_name_fix"))
 499     {
 500       fputs( "The target machine has no needed machine name fixes\n", stderr );
 501       goto done;
 502     }
 503
 504   scratch[0] = '_';
 505   scratch[1] = '_';
 506
 507   for (base = text;
 508        xregexec (label_re, base, 2, match, 0) == 0;
 509        base = limit)
 510     {
 511       base += match[0].rm_eo;
 512       /* We're looking at an #if or #ifdef.  Scan forward for the
 513          next non-escaped newline.  */
 514       line = limit = base;
 515       do
 516         {
 517           limit++;
 518           limit = strchr (limit, '\n');
 519           if (!limit)
 520             goto done;
 521         }
 522       while (limit[-1] == '\\');
 523
 524       /* If the 'name_pat' matches in between base and limit, we have
 525          a bogon.  It is not worth the hassle of excluding comments
 526          because comments on #if/#ifdef lines are rare, and strings on
 527          such lines are illegal.
 528
 529          REG_NOTBOL means 'base' is not at the beginning of a line, which
 530          shouldn't matter since the name_re has no ^ anchor, but let's
 531          be accurate anyway.  */
 532
 533       for (;;)
 534         {
 535         again:
 536           if (base == limit)
 537             break;
 538
 539           if (xregexec (name_re, base, 1, match, REG_NOTBOL))
 540             goto done;  /* No remaining match in this file */
 541
 542           /* Match; is it on the line?  */
 543           if (match[0].rm_eo > limit - base)
 544             break;
 545
 546           p = base + match[0].rm_so;
 547           base += match[0].rm_eo;
 548
 549           /* One more test: if on the same line we have the same string
 550              with the appropriate underscores, then leave it alone.
 551              We want exactly two leading and trailing underscores.  */
 552           if (*p == '_')
 553             {
 554               len = base - p - ((*base == '_') ? 2 : 1);
 555               q = p + 1;
 556             }
 557           else
 558             {
 559               len = base - p - ((*base == '_') ? 1 : 0);
 560               q = p;
 561             }
 562           if (len + 4 > SCRATCHSZ)
 563             abort ();
 564           memcpy (&scratch[2], q, len);
 565           len += 2;
 566           scratch[len++] = '_';
 567           scratch[len++] = '_';
 568
 569           for (q = line; q <= limit - len; q++)
 570             if (*q == '_' && !strncmp (q, scratch, len))
 571               goto again;
 572
 573           fwrite (text, 1, p - text, stdout);
 574           fwrite (scratch, 1, len, stdout);
 575
 576           text = base;
 577         }
 578     }
 579  done:
 580   fputs (text, stdout);
 581 }
 582
 583
 584 FIX_PROC_HEAD( wrap_fix )
 585 {
 586   tSCC   z_no_wrap_pat[] = "^#if.*__need_";
 587   static regex_t no_wrapping_re; /* assume zeroed data */
 588
 589   tCC*   pz_name = NULL;
 590
 591   if (no_wrapping_re.allocated == 0)
 592     compile_re( z_no_wrap_pat, &no_wrapping_re, 0, "no-wrap pattern",
 593                 "wrap-fix" );
 594
 595   /*
 596    *  IF we do *not* match the no-wrap re, then we have a double negative.
 597    *  A double negative means YES.
 598    */
 599   if (xregexec( &no_wrapping_re, text, 0, NULL, 0 ) != 0)
 600     {
 601       /*
 602        *  A single file can get wrapped more than once by different fixes.
 603        *  A single fix can wrap multiple files.  Therefore, guard with
 604        *  *both* the fix name and the file name.
 605        */
 606       size_t ln = strlen( filname ) + strlen( p_fixd->fix_name ) + 14;
 607       char*  pz = XNEWVEC (char, ln);
 608       pz_name = pz;
 609       sprintf( pz, "FIXINC_WRAP_%s-%s", filname, p_fixd->fix_name );
 610
 611       for (pz += 12; 1; pz++) {
 612         char ch = *pz;
 613
 614         if (ch == NUL)
 615           break;
 616
 617         if (! ISALNUM( ch )) {
 618           *pz = '_';
 619         }
 620         else {
 621           *pz = TOUPPER( ch );
 622         }
 623       }
 624
 625       printf( "#ifndef %s\n", pz_name );
 626       printf( "#define %s 1\n\n", pz_name );
 627     }
 628
 629   if (p_fixd->patch_args[1] == (tCC*)NULL)
 630     fputs( text, stdout );
 631
 632   else {
 633     fputs( p_fixd->patch_args[1], stdout );
 634     fputs( text, stdout );
 635     if (p_fixd->patch_args[2] != (tCC*)NULL)
 636       fputs( p_fixd->patch_args[2], stdout );
 637   }
 638
 639   if (pz_name != NULL) {
 640     printf( "\n#endif  /* %s */\n", pz_name );
 641     free( (void*)pz_name );
 642   }
 643 }
 644
 645
 646 /*
 647  *  Search for multiple copies of a regular expression.  Each block
 648  *  of matched text is replaced with the format string, as described
 649  *  above in `format_write'.
 650  */
 651 FIX_PROC_HEAD( gnu_type_fix )
 652 {
 653   const char* pz_pat;
 654   regex_t    re;
 655   regmatch_t rm[GTYPE_SE_CT+1];
 656   IGNORE_ARG(filname);
 657
 658   {
 659     tTestDesc* pTD = p_fixd->p_test_desc;
 660     int        ct  = p_fixd->test_ct;
 661     for (;;)
 662       {
 663         if (ct-- <= 0)
 664           {
 665             fprintf (stderr, zNeedsArg, p_fixd->fix_name, "search text", 1);
 666             exit (EXIT_BROKEN);
 667           }
 668
 669         if (pTD->type == TT_EGREP)
 670           {
 671             pz_pat = pTD->pz_test_text;
 672             break;
 673           }
 674
 675         pTD++;
 676       }
 677   }
 678
 679   compile_re (pz_pat, &re, 1, "gnu type typedef", "gnu_type_fix");
 680
 681   while (xregexec (&re, text, GTYPE_SE_CT+1, rm, 0) == 0)
 682     {
 683       text = emit_gnu_type (text, rm);
 684     }
 685
 686   /*
 687    *  Dump out the rest of the file
 688    */
 689   fputs (text, stdout);
 690 }
 691
 692
 693 /* = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
 694
 695      test for fix selector
 696
 697      THIS IS THE ONLY EXPORTED ROUTINE
 698
 699 */
 700 void
 701 apply_fix( tFixDesc* p_fixd, tCC* filname )
 702 {
 703 #define _FT_(n,p) { n, p },
 704   static fix_entry_t fix_table[] = { FIXUP_TABLE { NULL, NULL }};
 705 #undef _FT_
 706 #define FIX_TABLE_CT (ARRAY_SIZE (fix_table)-1)
 707
 708   tCC* fixname = p_fixd->patch_args[0];
 709   char* buf;
 710   int ct = FIX_TABLE_CT;
 711   fix_entry_t* pfe = fix_table;
 712
 713   for (;;)
 714     {
 715       if (strcmp (pfe->fix_name, fixname) == 0)
 716         break;
 717       if (--ct <= 0)
 718         {
 719           fprintf (stderr, "fixincl error:  the `%s' fix is unknown\n",
 720                    fixname );
 721           exit (EXIT_BROKEN);
 722         }
 723       pfe++;
 724     }
 725
 726   buf = load_file_data (stdin);
 727   (*pfe->fix_proc)( filname, buf, p_fixd );
 728 }
 729
 730 #ifdef SEPARATE_FIX_PROC
 731 tSCC z_usage[] =
 732 "USAGE: applyfix <fix-name> <file-to-fix> <file-source> <file-destination>\n";
 733 tSCC z_reopen[] =
 734 "FS error %d (%s) reopening %s as std%s\n";
 735
 736 int
 737 main( int argc, char** argv )
 738 {
 739   tFixDesc* pFix;
 740   char* pz_tmptmp;
 741   char* pz_tmp_base;
 742   char* pz_tmp_dot;
 743
 744   if (argc != 5)
 745     {
 746     usage_failure:
 747       fputs (z_usage, stderr);
 748       return EXIT_FAILURE;
 749     }
 750
 751   initialize_opts ();
 752
 753   {
 754     char* pz = argv[1];
 755     long  idx;
 756
 757     if (! ISDIGIT ( *pz ))
 758       goto usage_failure;
 759
 760     idx = strtol (pz, &pz, 10);
 761     if ((*pz != NUL) || ((unsigned)idx >= FIX_COUNT))
 762       goto usage_failure;
 763     pFix = fixDescList + idx;
 764   }
 765
 766   if (freopen (argv[3], "r", stdin) != stdin)
 767     {
 768       fprintf (stderr, z_reopen, errno, strerror( errno ), argv[3], "in");
 769       return EXIT_FAILURE;
 770     }
 771
 772   pz_tmptmp = XNEWVEC (char, strlen (argv[4]) + 5);
 773   strcpy( pz_tmptmp, argv[4] );
 774
 775   /* Don't lose because "12345678" and "12345678X" map to the same
 776      file under DOS restricted 8+3 file namespace.  Note that DOS
 777      doesn't allow more than one dot in the trunk of a file name.  */
 778   pz_tmp_base = basename( pz_tmptmp );
 779   pz_tmp_dot = strchr( pz_tmp_base, '.' );
 780 #ifdef _PC_NAME_MAX
 781   if (pathconf( pz_tmptmp, _PC_NAME_MAX ) <= 12 /* is this DOS or Windows9X? */
 782       && pz_tmp_dot != (char*)NULL)
 783     strcpy (pz_tmp_dot+1, "X"); /* nuke the original extension */
 784   else
 785 #endif /* _PC_NAME_MAX */
 786     strcat (pz_tmptmp, ".X");
 787   if (freopen (pz_tmptmp, "w", stdout) != stdout)
 788     {
 789       fprintf (stderr, z_reopen, errno, strerror( errno ), pz_tmptmp, "out");
 790       return EXIT_FAILURE;
 791     }
 792
 793   apply_fix (pFix, argv[1]);
 794   fclose (stdout);
 795   fclose (stdin);
 796   unlink (argv[4]);
 797   if (rename (pz_tmptmp, argv[4]) != 0)
 798     {
 799       fprintf (stderr, "error %d (%s) renaming %s to %s\n", errno,
 800                strerror( errno ), pz_tmptmp, argv[4]);
 801       return EXIT_FAILURE;
 802     }
 803
 804   return EXIT_SUCCESS;
 805 }
 806 #endif