304 lines
9.5 KiB
C
304 lines
9.5 KiB
C
/*************************************************
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* Perl-Compatible Regular Expressions *
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*************************************************/
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/* PCRE is a library of functions to support regular expressions whose syntax
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and semantics are as close as possible to those of the Perl 5 language.
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Written by Philip Hazel
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Original API code Copyright (c) 1997-2012 University of Cambridge
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New API code Copyright (c) 2016-2020 University of Cambridge
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-----------------------------------------------------------------------------
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the University of Cambridge nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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-----------------------------------------------------------------------------
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*/
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/* This is a freestanding support program to generate a file containing
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character tables for PCRE2. The tables are built using the pcre2_maketables()
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function, which is part of the PCRE2 API. By default, the system's "C" locale
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is used rather than what the building user happens to have set, but the -L
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option can be used to select the current locale from the LC_ALL environment
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variable. By default, the tables are written in source form, but if -b is
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given, they are written in binary. */
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <locale.h>
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#define PCRE2_CODE_UNIT_WIDTH 0 /* Must be set, but not relevant here */
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#include "pcre2_internal.h"
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#define PCRE2_DFTABLES /* pcre2_maketables.c notices this */
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#include "pcre2_maketables.c"
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static const char *classlist[] =
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{
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"space", "xdigit", "digit", "upper", "lower",
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"word", "graph", "print", "punct", "cntrl"
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};
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/*************************************************
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* Usage *
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*************************************************/
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"Usage: pcre2_dftables [options] <output file>\n"
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" -b Write output in binary (default is source code)\n"
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" -L Use locale from LC_ALL (default is \"C\" locale)\n"
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);
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}
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/*************************************************
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* Entry point *
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*************************************************/
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int main(int argc, char **argv)
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{
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FILE *f;
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int i;
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int nclass = 0;
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BOOL binary = FALSE;
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char *env = (char *)"C";
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const unsigned char *tables;
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const unsigned char *base_of_tables;
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/* Process options */
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for (i = 1; i < argc; i++)
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{
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char *arg = argv[i];
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if (*arg != '-') break;
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if (strcmp(arg, "-help") == 0 || strcmp(arg, "--help") == 0)
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{
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usage();
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return 0;
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}
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else if (strcmp(arg, "-L") == 0)
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{
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if (setlocale(LC_ALL, "") == NULL)
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{
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(void)fprintf(stderr, "pcre2_dftables: setlocale() failed\n");
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return 1;
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}
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env = getenv("LC_ALL");
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}
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else if (strcmp(arg, "-b") == 0)
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binary = TRUE;
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else
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{
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(void)fprintf(stderr, "pcre2_dftables: unrecognized option %s\n", arg);
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return 1;
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}
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}
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if (i != argc - 1)
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{
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(void)fprintf(stderr, "pcre2_dftables: one filename argument is required\n");
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return 1;
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}
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/* Make the tables */
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tables = maketables();
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base_of_tables = tables;
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f = fopen(argv[i], "wb");
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if (f == NULL)
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{
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fprintf(stderr, "pcre2_dftables: failed to open %s for writing\n", argv[1]);
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return 1;
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}
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/* If -b was specified, we write the tables in binary. */
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if (binary)
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{
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int yield = 0;
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size_t len = fwrite(tables, 1, TABLES_LENGTH, f);
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if (len != TABLES_LENGTH)
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{
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(void)fprintf(stderr, "pcre2_dftables: fwrite() returned wrong length %d "
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"instead of %d\n", (int)len, TABLES_LENGTH);
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yield = 1;
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}
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fclose(f);
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free((void *)base_of_tables);
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return yield;
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}
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/* Write the tables as source code for inclusion in the PCRE2 library. There
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are several fprintf() calls here, because gcc in pedantic mode complains about
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the very long string otherwise. */
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(void)fprintf(f,
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"/*************************************************\n"
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"* Perl-Compatible Regular Expressions *\n"
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"*************************************************/\n\n"
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"/* This file was automatically written by the pcre2_dftables auxiliary\n"
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"program. It contains character tables that are used when no external\n"
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"tables are passed to PCRE2 by the application that calls it. The tables\n"
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"are used only for characters whose code values are less than 256. */\n\n");
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(void)fprintf(f,
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"/* This set of tables was written in the %s locale. */\n\n", env);
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(void)fprintf(f,
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"/* The pcre2_ftables program (which is distributed with PCRE2) can be used\n"
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"to build alternative versions of this file. This is necessary if you are\n"
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"running in an EBCDIC environment, or if you want to default to a different\n"
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"encoding, for example ISO-8859-1. When pcre2_dftables is run, it creates\n"
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"these tables in the \"C\" locale by default. This happens automatically if\n"
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"PCRE2 is configured with --enable-rebuild-chartables. However, you can run\n"
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"pcre2_dftables manually with the -L option to build tables using the LC_ALL\n"
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"locale. */\n\n");
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/* Force config.h in z/OS */
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#if defined NATIVE_ZOS
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(void)fprintf(f,
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"/* For z/OS, config.h is forced */\n"
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"#ifndef HAVE_CONFIG_H\n"
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"#define HAVE_CONFIG_H 1\n"
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"#endif\n\n");
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#endif
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(void)fprintf(f,
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"/* The following #include is present because without it gcc 4.x may remove\n"
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"the array definition from the final binary if PCRE2 is built into a static\n"
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"library and dead code stripping is activated. This leads to link errors.\n"
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"Pulling in the header ensures that the array gets flagged as \"someone\n"
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"outside this compilation unit might reference this\" and so it will always\n"
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"be supplied to the linker. */\n\n");
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(void)fprintf(f,
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"#ifdef HAVE_CONFIG_H\n"
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"#include \"config.h\"\n"
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"#endif\n\n"
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"#include \"pcre2_internal.h\"\n\n");
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(void)fprintf(f,
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"const uint8_t PRIV(default_tables)[] = {\n\n"
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"/* This table is a lower casing table. */\n\n");
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(void)fprintf(f, " ");
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for (i = 0; i < 256; i++)
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{
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if ((i & 7) == 0 && i != 0) fprintf(f, "\n ");
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fprintf(f, "%3d", *tables++);
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if (i != 255) fprintf(f, ",");
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}
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(void)fprintf(f, ",\n\n");
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(void)fprintf(f, "/* This table is a case flipping table. */\n\n");
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(void)fprintf(f, " ");
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for (i = 0; i < 256; i++)
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{
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if ((i & 7) == 0 && i != 0) fprintf(f, "\n ");
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fprintf(f, "%3d", *tables++);
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if (i != 255) fprintf(f, ",");
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}
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(void)fprintf(f, ",\n\n");
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(void)fprintf(f,
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"/* This table contains bit maps for various character classes. Each map is 32\n"
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"bytes long and the bits run from the least significant end of each byte. The\n"
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"classes that have their own maps are: space, xdigit, digit, upper, lower, word,\n"
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"graph, print, punct, and cntrl. Other classes are built from combinations. */\n\n");
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(void)fprintf(f, " ");
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for (i = 0; i < cbit_length; i++)
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{
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if ((i & 7) == 0 && i != 0)
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{
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if ((i & 31) == 0) (void)fprintf(f, "\n");
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if ((i & 24) == 8) (void)fprintf(f, " /* %s */", classlist[nclass++]);
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(void)fprintf(f, "\n ");
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}
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(void)fprintf(f, "0x%02x", *tables++);
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if (i != cbit_length - 1) (void)fprintf(f, ",");
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}
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(void)fprintf(f, ",\n\n");
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(void)fprintf(f,
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"/* This table identifies various classes of character by individual bits:\n"
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" 0x%02x white space character\n"
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" 0x%02x letter\n"
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" 0x%02x lower case letter\n"
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" 0x%02x decimal digit\n"
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" 0x%02x alphanumeric or '_'\n*/\n\n",
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ctype_space, ctype_letter, ctype_lcletter, ctype_digit, ctype_word);
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(void)fprintf(f, " ");
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for (i = 0; i < 256; i++)
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{
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if ((i & 7) == 0 && i != 0)
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{
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(void)fprintf(f, " /* ");
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if (isprint(i-8)) (void)fprintf(f, " %c -", i-8);
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else (void)fprintf(f, "%3d-", i-8);
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if (isprint(i-1)) (void)fprintf(f, " %c ", i-1);
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else (void)fprintf(f, "%3d", i-1);
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(void)fprintf(f, " */\n ");
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}
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(void)fprintf(f, "0x%02x", *tables++);
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if (i != 255) (void)fprintf(f, ",");
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}
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(void)fprintf(f, "};/* ");
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if (isprint(i-8)) (void)fprintf(f, " %c -", i-8);
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else (void)fprintf(f, "%3d-", i-8);
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if (isprint(i-1)) (void)fprintf(f, " %c ", i-1);
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else (void)fprintf(f, "%3d", i-1);
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(void)fprintf(f, " */\n\n/* End of pcre2_chartables.c */\n");
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fclose(f);
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free((void *)base_of_tables);
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return 0;
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}
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/* End of pcre2_dftables.c */
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