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 Original API code Copyright (c) 1997-2012 University of Cambridge
10 New API code Copyright (c) 2016-2020 University of Cambridge
11
12 -----------------------------------------------------------------------------
13 Redistribution and use in source and binary forms, with or without
14 modification, are permitted provided that the following conditions are met:
15
16 * Redistributions of source code must retain the above copyright notice,
17 this list of conditions and the following disclaimer.
18
19 * Redistributions in binary form must reproduce the above copyright
20 notice, this list of conditions and the following disclaimer in the
21 documentation and/or other materials provided with the distribution.
22
23 * Neither the name of the University of Cambridge nor the names of its
24 contributors may be used to endorse or promote products derived from
25 this software without specific prior written permission.
26
27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
28 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
31 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 POSSIBILITY OF SUCH DAMAGE.
38 -----------------------------------------------------------------------------
39 */
40
41 #ifdef HAVE_CONFIG_H
42 #include "config.h"
43 #endif
44
45 /* Save the configured link size, which is in bytes. In 16-bit and 32-bit modes
46 its value gets changed by pcre2_intmodedep.h (included by pcre2_internal.h) to
47 be in code units. */
48
49 static int configured_link_size = LINK_SIZE;
50
51 #include "pcre2_internal.h"
52
53 /* These macros are the standard way of turning unquoted text into C strings.
54 They allow macros like PCRE2_MAJOR to be defined without quotes, which is
55 convenient for user programs that want to test their values. */
56
57 #define STRING(a) # a
58 #define XSTRING(s) STRING(s)
59
60
61 /*************************************************
62 * Return info about what features are configured *
63 *************************************************/
64
65 /* If where is NULL, the length of memory required is returned.
66
67 Arguments:
68 what what information is required
69 where where to put the information
70
71 Returns: 0 if a numerical value is returned
72 >= 0 if a string value
73 PCRE2_ERROR_BADOPTION if "where" not recognized
74 or JIT target requested when JIT not enabled
75 */
76
77 PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION
pcre2_config(uint32_t what,void * where)78 pcre2_config(uint32_t what, void *where)
79 {
80 if (where == NULL) /* Requests a length */
81 {
82 switch(what)
83 {
84 default:
85 return PCRE2_ERROR_BADOPTION;
86
87 case PCRE2_CONFIG_BSR:
88 case PCRE2_CONFIG_COMPILED_WIDTHS:
89 case PCRE2_CONFIG_DEPTHLIMIT:
90 case PCRE2_CONFIG_HEAPLIMIT:
91 case PCRE2_CONFIG_JIT:
92 case PCRE2_CONFIG_LINKSIZE:
93 case PCRE2_CONFIG_MATCHLIMIT:
94 case PCRE2_CONFIG_NEVER_BACKSLASH_C:
95 case PCRE2_CONFIG_NEWLINE:
96 case PCRE2_CONFIG_PARENSLIMIT:
97 case PCRE2_CONFIG_STACKRECURSE: /* Obsolete */
98 case PCRE2_CONFIG_TABLES_LENGTH:
99 case PCRE2_CONFIG_UNICODE:
100 return sizeof(uint32_t);
101
102 /* These are handled below */
103
104 case PCRE2_CONFIG_JITTARGET:
105 case PCRE2_CONFIG_UNICODE_VERSION:
106 case PCRE2_CONFIG_VERSION:
107 break;
108 }
109 }
110
111 switch (what)
112 {
113 default:
114 return PCRE2_ERROR_BADOPTION;
115
116 case PCRE2_CONFIG_BSR:
117 #ifdef BSR_ANYCRLF
118 *((uint32_t *)where) = PCRE2_BSR_ANYCRLF;
119 #else
120 *((uint32_t *)where) = PCRE2_BSR_UNICODE;
121 #endif
122 break;
123
124 case PCRE2_CONFIG_COMPILED_WIDTHS:
125 *((uint32_t *)where) = 0
126 #ifdef SUPPORT_PCRE2_8
127 + 1
128 #endif
129 #ifdef SUPPORT_PCRE2_16
130 + 2
131 #endif
132 #ifdef SUPPORT_PCRE2_32
133 + 4
134 #endif
135 ;
136 break;
137
138 case PCRE2_CONFIG_DEPTHLIMIT:
139 *((uint32_t *)where) = MATCH_LIMIT_DEPTH;
140 break;
141
142 case PCRE2_CONFIG_HEAPLIMIT:
143 *((uint32_t *)where) = HEAP_LIMIT;
144 break;
145
146 case PCRE2_CONFIG_JIT:
147 #ifdef SUPPORT_JIT
148 *((uint32_t *)where) = 1;
149 #else
150 *((uint32_t *)where) = 0;
151 #endif
152 break;
153
154 case PCRE2_CONFIG_JITTARGET:
155 #ifdef SUPPORT_JIT
156 {
157 const char *v = PRIV(jit_get_target)();
158 return (int)(1 + ((where == NULL)?
159 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v)));
160 }
161 #else
162 return PCRE2_ERROR_BADOPTION;
163 #endif
164
165 case PCRE2_CONFIG_LINKSIZE:
166 *((uint32_t *)where) = (uint32_t)configured_link_size;
167 break;
168
169 case PCRE2_CONFIG_MATCHLIMIT:
170 *((uint32_t *)where) = MATCH_LIMIT;
171 break;
172
173 case PCRE2_CONFIG_NEWLINE:
174 *((uint32_t *)where) = NEWLINE_DEFAULT;
175 break;
176
177 case PCRE2_CONFIG_NEVER_BACKSLASH_C:
178 #ifdef NEVER_BACKSLASH_C
179 *((uint32_t *)where) = 1;
180 #else
181 *((uint32_t *)where) = 0;
182 #endif
183 break;
184
185 case PCRE2_CONFIG_PARENSLIMIT:
186 *((uint32_t *)where) = PARENS_NEST_LIMIT;
187 break;
188
189 /* This is now obsolete. The stack is no longer used via recursion for
190 handling backtracking in pcre2_match(). */
191
192 case PCRE2_CONFIG_STACKRECURSE:
193 *((uint32_t *)where) = 0;
194 break;
195
196 case PCRE2_CONFIG_TABLES_LENGTH:
197 *((uint32_t *)where) = TABLES_LENGTH;
198 break;
199
200 case PCRE2_CONFIG_UNICODE_VERSION:
201 {
202 #if defined SUPPORT_UNICODE
203 const char *v = PRIV(unicode_version);
204 #else
205 const char *v = "Unicode not supported";
206 #endif
207 return (int)(1 + ((where == NULL)?
208 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v)));
209 }
210 break;
211
212 case PCRE2_CONFIG_UNICODE:
213 #if defined SUPPORT_UNICODE
214 *((uint32_t *)where) = 1;
215 #else
216 *((uint32_t *)where) = 0;
217 #endif
218 break;
219
220 /* The hackery in setting "v" below is to cope with the case when
221 PCRE2_PRERELEASE is set to an empty string (which it is for real releases).
222 If the second alternative is used in this case, it does not leave a space
223 before the date. On the other hand, if all four macros are put into a single
224 XSTRING when PCRE2_PRERELEASE is not empty, an unwanted space is inserted.
225 There are problems using an "obvious" approach like this:
226
227 XSTRING(PCRE2_MAJOR) "." XSTRING(PCRE_MINOR)
228 XSTRING(PCRE2_PRERELEASE) " " XSTRING(PCRE_DATE)
229
230 because, when PCRE2_PRERELEASE is empty, this leads to an attempted expansion
231 of STRING(). The C standard states: "If (before argument substitution) any
232 argument consists of no preprocessing tokens, the behavior is undefined." It
233 turns out the gcc treats this case as a single empty string - which is what
234 we really want - but Visual C grumbles about the lack of an argument for the
235 macro. Unfortunately, both are within their rights. As there seems to be no
236 way to test for a macro's value being empty at compile time, we have to
237 resort to a runtime test. */
238
239 case PCRE2_CONFIG_VERSION:
240 {
241 const char *v = (XSTRING(Z PCRE2_PRERELEASE)[1] == 0)?
242 XSTRING(PCRE2_MAJOR.PCRE2_MINOR PCRE2_DATE) :
243 XSTRING(PCRE2_MAJOR.PCRE2_MINOR) XSTRING(PCRE2_PRERELEASE PCRE2_DATE);
244 return (int)(1 + ((where == NULL)?
245 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v)));
246 }
247 }
248
249 return 0;
250 }
251
252 /* End of pcre2_config.c */
253