pcre/dftables.cpp

   1 /*************************************************
   2 *      Perl-Compatible Regular Expressions       *
   3 *************************************************/
   4
   5 /* PCRE is a library of functions to support regular expressions whose syntax
   6 and semantics are as close as possible to those of the Perl 5 language.
   7
   8                        Written by Philip Hazel
   9            Copyright (c) 1997-2007 University of Cambridge
  10
  11 -----------------------------------------------------------------------------
  12 Redistribution and use in source and binary forms, with or without
  13 modification, are permitted provided that the following conditions are met:
  14
  15     * Redistributions of source code must retain the above copyright notice,
  16       this list of conditions and the following disclaimer.
  17
  18     * Redistributions in binary form must reproduce the above copyright
  19       notice, this list of conditions and the following disclaimer in the
  20       documentation and/or other materials provided with the distribution.
  21
  22     * Neither the name of the University of Cambridge nor the names of its
  23       contributors may be used to endorse or promote products derived from
  24       this software without specific prior written permission.
  25
  26 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  27 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  30 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  34 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  35 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  36 POSSIBILITY OF SUCH DAMAGE.
  37 -----------------------------------------------------------------------------
  38 */
  39
  40
  41 /* This is a freestanding support program to generate a file containing
  42 character tables for PCRE. The tables are built according to the current
  43 locale. Now that pcre_maketables is a function visible to the outside world, we
  44 make use of its code from here in order to be consistent. */
  45
  46 #ifdef HAVE_CONFIG_H
  47 #include <config.h>
  48 #endif
  49
  50 #include <ctype.h>
  51 #include <stdio.h>
  52 #include <string.h>
  53 #include <locale.h>
  54
  55 #include "pcre_internal.h"
  56
  57 #define DFTABLES          /* pcre_maketables.c notices this */
  58 #include "pcre_maketables.c"
  59
  60
  61 int main(int argc, char **argv)
  62 {
  63 FILE *f;
  64 int i = 1;
  65 const unsigned char *tables;
  66 const unsigned char *base_of_tables;
  67
  68 /* By default, the default C locale is used rather than what the building user
  69 happens to have set. However, if the -L option is given, set the locale from
  70 the LC_xxx environment variables. */
  71
  72 if (argc > 1 && strcmp(argv[1], "-L") == 0)
  73   {
  74   setlocale(LC_ALL, "");        /* Set from environment variables */
  75   i++;
  76   }
  77
  78 if (argc < i + 1)
  79   {
  80   fprintf(stderr, "dftables: one filename argument is required\n");
  81   return 1;
  82   }
  83
  84 tables = pcre_maketables();
  85 base_of_tables = tables;
  86
  87 f = fopen(argv[i], "wb");
  88 if (f == NULL)
  89   {
  90   fprintf(stderr, "dftables: failed to open %s for writing\n", argv[1]);
  91   return 1;
  92   }
  93
  94 /* There are several fprintf() calls here, because gcc in pedantic mode
  95 complains about the very long string otherwise. */
  96
  97 fprintf(f,
  98   "/*************************************************\n"
  99   "*      Perl-Compatible Regular Expressions       *\n"
 100   "*************************************************/\n\n"
 101   "/* This file was automatically written by the dftables auxiliary\n"
 102   "program. It contains character tables that are used when no external\n"
 103   "tables are passed to PCRE by the application that calls it. The tables\n"
 104   "are used only for characters whose code values are less than 256.\n\n");
 105 fprintf(f,
 106   "The following #includes are present because without them gcc 4.x may remove\n"
 107   "the array definition from the final binary if PCRE is built into a static\n"
 108   "library and dead code stripping is activated. This leads to link errors.\n"
 109   "Pulling in the header ensures that the array gets flagged as \"someone\n"
 110   "outside this compilation unit might reference this\" and so it will always\n"
 111   "be supplied to the linker. */\n\n"
 112   "#ifdef HAVE_CONFIG_H\n"
 113   "#include <config.h>\n"
 114   "#endif\n\n"
 115   "#include \"pcre_internal.h\"\n\n");
 116 fprintf(f,
 117   "const unsigned char _pcre_default_tables[] = {\n\n"
 118   "/* This table is a lower casing table. */\n\n");
 119
 120 fprintf(f, "  ");
 121 for (i = 0; i < 256; i++)
 122   {
 123   if ((i & 7) == 0 && i != 0) fprintf(f, "\n  ");
 124   fprintf(f, "%3d", *tables++);
 125   if (i != 255) fprintf(f, ",");
 126   }
 127 fprintf(f, ",\n\n");
 128
 129 fprintf(f, "/* This table is a case flipping table. */\n\n");
 130
 131 fprintf(f, "  ");
 132 for (i = 0; i < 256; i++)
 133   {
 134   if ((i & 7) == 0 && i != 0) fprintf(f, "\n  ");
 135   fprintf(f, "%3d", *tables++);
 136   if (i != 255) fprintf(f, ",");
 137   }
 138 fprintf(f, ",\n\n");
 139
 140 fprintf(f,
 141   "/* This table contains bit maps for various character classes.\n"
 142   "Each map is 32 bytes long and the bits run from the least\n"
 143   "significant end of each byte. The classes that have their own\n"
 144   "maps are: space, xdigit, digit, upper, lower, word, graph\n"
 145   "print, punct, and cntrl. Other classes are built from combinations. */\n\n");
 146
 147 fprintf(f, "  ");
 148 for (i = 0; i < cbit_length; i++)
 149   {
 150   if ((i & 7) == 0 && i != 0)
 151     {
 152     if ((i & 31) == 0) fprintf(f, "\n");
 153     fprintf(f, "\n  ");
 154     }
 155   fprintf(f, "0x%02x", *tables++);
 156   if (i != cbit_length - 1) fprintf(f, ",");
 157   }
 158 fprintf(f, ",\n\n");
 159
 160 fprintf(f,
 161   "/* This table identifies various classes of character by individual bits:\n"
 162   "  0x%02x   white space character\n"
 163   "  0x%02x   letter\n"
 164   "  0x%02x   decimal digit\n"
 165   "  0x%02x   hexadecimal digit\n"
 166   "  0x%02x   alphanumeric or '_'\n"
 167   "  0x%02x   regular expression metacharacter or binary zero\n*/\n\n",
 168   ctype_space, ctype_letter, ctype_digit, ctype_xdigit, ctype_word,
 169   ctype_meta);
 170
 171 fprintf(f, "  ");
 172 for (i = 0; i < 256; i++)
 173   {
 174   if ((i & 7) == 0 && i != 0)
 175     {
 176     fprintf(f, " /* ");
 177     if (isprint(i-8)) fprintf(f, " %c -", i-8);
 178       else fprintf(f, "%3d-", i-8);
 179     if (isprint(i-1)) fprintf(f, " %c ", i-1);
 180       else fprintf(f, "%3d", i-1);
 181     fprintf(f, " */\n  ");
 182     }
 183   fprintf(f, "0x%02x", *tables++);
 184   if (i != 255) fprintf(f, ",");
 185   }
 186
 187 fprintf(f, "};/* ");
 188 if (isprint(i-8)) fprintf(f, " %c -", i-8);
 189   else fprintf(f, "%3d-", i-8);
 190 if (isprint(i-1)) fprintf(f, " %c ", i-1);
 191   else fprintf(f, "%3d", i-1);
 192 fprintf(f, " */\n\n/* End of pcre_chartables.c */\n");
 193
 194 fclose(f);
 195 free((void *)base_of_tables);
 196 return 0;
 197 }
 198
 199 /* End of dftables.c */