/[pcre]/code/trunk/dftables.c
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Contents of /code/trunk/dftables.c

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Revision 128 - (hide annotations) (download)
Tue Mar 20 11:46:50 2007 UTC (7 years, 9 months ago) by ph10
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File size: 6649 byte(s)
Make the use of dftables optional, and not the default. Further tidies to 
documentation.

1 nigel 27 /*************************************************
2     * Perl-Compatible Regular Expressions *
3     *************************************************/
4    
5 nigel 77 /* PCRE is a library of functions to support regular expressions whose syntax
6 nigel 27 and semantics are as close as possible to those of the Perl 5 language.
7    
8 nigel 77 Written by Philip Hazel
9 ph10 117 Copyright (c) 1997-2007 University of Cambridge
10 nigel 27
11     -----------------------------------------------------------------------------
12 nigel 75 Redistribution and use in source and binary forms, with or without
13     modification, are permitted provided that the following conditions are met:
14 nigel 27
15 nigel 75 * Redistributions of source code must retain the above copyright notice,
16     this list of conditions and the following disclaimer.
17 nigel 27
18 nigel 75 * 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 nigel 27
22 nigel 75 * 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 nigel 29
26 nigel 75 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 nigel 27 -----------------------------------------------------------------------------
38     */
39    
40    
41 ph10 128 /* 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 nigel 77 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 nigel 27
46     #include <ctype.h>
47     #include <stdio.h>
48     #include <string.h>
49 ph10 128 #include <locale.h>
50 nigel 27
51 nigel 77 #include "pcre_internal.h"
52 nigel 27
53 nigel 77 #define DFTABLES /* pcre_maketables.c notices this */
54     #include "pcre_maketables.c"
55 nigel 27
56    
57 nigel 73 int main(int argc, char **argv)
58 nigel 27 {
59 nigel 73 FILE *f;
60 ph10 128 int i = 1;
61     const unsigned char *tables;
62     const unsigned char *base_of_tables;
63 nigel 27
64 ph10 128 /* By default, the default C locale is used rather than what the building user
65     happens to have set. However, if the -L option is given, set the locale from
66     the LC_xxx environment variables. */
67    
68     if (argc > 1 && strcmp(argv[1], "-L") == 0)
69 nigel 73 {
70 ph10 128 setlocale(LC_ALL, ""); /* Set from environment variables */
71     i++;
72     }
73    
74     if (argc < i + 1)
75     {
76 nigel 73 fprintf(stderr, "dftables: one filename argument is required\n");
77     return 1;
78     }
79    
80 ph10 128 tables = pcre_maketables();
81     base_of_tables = tables;
82    
83     f = fopen(argv[i], "wb");
84 nigel 73 if (f == NULL)
85     {
86     fprintf(stderr, "dftables: failed to open %s for writing\n", argv[1]);
87     return 1;
88     }
89    
90 ph10 128 /* There are several fprintf() calls here, because gcc in pedantic mode
91     complains about the very long string otherwise. */
92 nigel 65
93 nigel 73 fprintf(f,
94 nigel 27 "/*************************************************\n"
95     "* Perl-Compatible Regular Expressions *\n"
96     "*************************************************/\n\n"
97 ph10 128 "/* This file was automatically written by the dftables auxiliary\n"
98     "program. It contains character tables that are used when no external\n"
99     "tables are passed to PCRE by the application that calls it. The tables\n"
100     "are used only for characters whose code values are less than 256.\n\n");
101 nigel 73 fprintf(f,
102 nigel 93 "The following #include is present because without it gcc 4.x may remove\n"
103     "the array definition from the final binary if PCRE is built into a static\n"
104     "library and dead code stripping is activated. This leads to link errors.\n"
105     "Pulling in the header ensures that the array gets flagged as \"someone\n"
106     "outside this compilation unit might reference this\" and so it will always\n"
107     "be supplied to the linker. */\n\n"
108     "#include \"pcre_internal.h\"\n\n");
109     fprintf(f,
110 nigel 77 "const unsigned char _pcre_default_tables[] = {\n\n"
111 nigel 27 "/* This table is a lower casing table. */\n\n");
112    
113 nigel 73 fprintf(f, " ");
114 nigel 27 for (i = 0; i < 256; i++)
115     {
116 nigel 73 if ((i & 7) == 0 && i != 0) fprintf(f, "\n ");
117     fprintf(f, "%3d", *tables++);
118     if (i != 255) fprintf(f, ",");
119 nigel 27 }
120 nigel 73 fprintf(f, ",\n\n");
121 nigel 27
122 nigel 73 fprintf(f, "/* This table is a case flipping table. */\n\n");
123 nigel 27
124 nigel 73 fprintf(f, " ");
125 nigel 27 for (i = 0; i < 256; i++)
126     {
127 nigel 73 if ((i & 7) == 0 && i != 0) fprintf(f, "\n ");
128     fprintf(f, "%3d", *tables++);
129     if (i != 255) fprintf(f, ",");
130 nigel 27 }
131 nigel 73 fprintf(f, ",\n\n");
132 nigel 27
133 nigel 73 fprintf(f,
134 nigel 43 "/* This table contains bit maps for various character classes.\n"
135     "Each map is 32 bytes long and the bits run from the least\n"
136     "significant end of each byte. The classes that have their own\n"
137     "maps are: space, xdigit, digit, upper, lower, word, graph\n"
138     "print, punct, and cntrl. Other classes are built from combinations. */\n\n");
139 nigel 27
140 nigel 73 fprintf(f, " ");
141 nigel 27 for (i = 0; i < cbit_length; i++)
142     {
143     if ((i & 7) == 0 && i != 0)
144     {
145 nigel 73 if ((i & 31) == 0) fprintf(f, "\n");
146     fprintf(f, "\n ");
147 nigel 27 }
148 nigel 73 fprintf(f, "0x%02x", *tables++);
149     if (i != cbit_length - 1) fprintf(f, ",");
150 nigel 27 }
151 nigel 73 fprintf(f, ",\n\n");
152 nigel 27
153 nigel 73 fprintf(f,
154 nigel 27 "/* This table identifies various classes of character by individual bits:\n"
155     " 0x%02x white space character\n"
156     " 0x%02x letter\n"
157     " 0x%02x decimal digit\n"
158     " 0x%02x hexadecimal digit\n"
159     " 0x%02x alphanumeric or '_'\n"
160     " 0x%02x regular expression metacharacter or binary zero\n*/\n\n",
161     ctype_space, ctype_letter, ctype_digit, ctype_xdigit, ctype_word,
162     ctype_meta);
163    
164 nigel 73 fprintf(f, " ");
165 nigel 27 for (i = 0; i < 256; i++)
166     {
167     if ((i & 7) == 0 && i != 0)
168     {
169 nigel 73 fprintf(f, " /* ");
170     if (isprint(i-8)) fprintf(f, " %c -", i-8);
171     else fprintf(f, "%3d-", i-8);
172     if (isprint(i-1)) fprintf(f, " %c ", i-1);
173     else fprintf(f, "%3d", i-1);
174     fprintf(f, " */\n ");
175 nigel 27 }
176 nigel 73 fprintf(f, "0x%02x", *tables++);
177     if (i != 255) fprintf(f, ",");
178 nigel 27 }
179    
180 nigel 73 fprintf(f, "};/* ");
181     if (isprint(i-8)) fprintf(f, " %c -", i-8);
182     else fprintf(f, "%3d-", i-8);
183     if (isprint(i-1)) fprintf(f, " %c ", i-1);
184     else fprintf(f, "%3d", i-1);
185 ph10 128 fprintf(f, " */\n\n/* End of pcre_chartables.c */\n");
186 nigel 27
187 nigel 73 fclose(f);
188 nigel 77 free((void *)base_of_tables);
189 nigel 27 return 0;
190     }
191    
192     /* End of dftables.c */

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