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) 2016-2017 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_internal.h to be in code units. */
47
48 static int configured_link_size = LINK_SIZE;
49
50 #include "pcre2_internal.h"
51
52 /* These macros are the standard way of turning unquoted text into C strings.
53 They allow macros like PCRE2_MAJOR to be defined without quotes, which is
54 convenient for user programs that want to test their values. */
55
56 #define STRING(a) # a
57 #define XSTRING(s) STRING(s)
58
59
60 /*************************************************
61 * Return info about what features are configured *
62 *************************************************/
63
64 /* If where is NULL, the length of memory required is returned.
65
66 Arguments:
67 what what information is required
68 where where to put the information
69
70 Returns: 0 if a numerical value is returned
71 >= 0 if a string value
72 PCRE2_ERROR_BADOPTION if "where" not recognized
73 or JIT target requested when JIT not enabled
74 */
75
76 PCRE2_EXP_DEFN int PCRE2_CALL_CONVENTION
pcre2_config(uint32_t what,void * where)77 pcre2_config(uint32_t what, void *where)
78 {
79 if (where == NULL) /* Requests a length */
80 {
81 switch(what)
82 {
83 default:
84 return PCRE2_ERROR_BADOPTION;
85
86 case PCRE2_CONFIG_BSR:
87 case PCRE2_CONFIG_COMPILED_WIDTHS:
88 case PCRE2_CONFIG_DEPTHLIMIT:
89 case PCRE2_CONFIG_HEAPLIMIT:
90 case PCRE2_CONFIG_JIT:
91 case PCRE2_CONFIG_LINKSIZE:
92 case PCRE2_CONFIG_MATCHLIMIT:
93 case PCRE2_CONFIG_NEVER_BACKSLASH_C:
94 case PCRE2_CONFIG_NEWLINE:
95 case PCRE2_CONFIG_PARENSLIMIT:
96 case PCRE2_CONFIG_STACKRECURSE: /* Obsolete */
97 case PCRE2_CONFIG_UNICODE:
98 return sizeof(uint32_t);
99
100 /* These are handled below */
101
102 case PCRE2_CONFIG_JITTARGET:
103 case PCRE2_CONFIG_UNICODE_VERSION:
104 case PCRE2_CONFIG_VERSION:
105 break;
106 }
107 }
108
109 switch (what)
110 {
111 default:
112 return PCRE2_ERROR_BADOPTION;
113
114 case PCRE2_CONFIG_BSR:
115 #ifdef BSR_ANYCRLF
116 *((uint32_t *)where) = PCRE2_BSR_ANYCRLF;
117 #else
118 *((uint32_t *)where) = PCRE2_BSR_UNICODE;
119 #endif
120 break;
121
122 case PCRE2_CONFIG_COMPILED_WIDTHS:
123 *((uint32_t *)where) = 0
124 #ifdef SUPPORT_PCRE2_8
125 + 1
126 #endif
127 #ifdef SUPPORT_PCRE2_16
128 + 2
129 #endif
130 #ifdef SUPPORT_PCRE2_32
131 + 4
132 #endif
133 ;
134 break;
135
136 case PCRE2_CONFIG_DEPTHLIMIT:
137 *((uint32_t *)where) = MATCH_LIMIT_DEPTH;
138 break;
139
140 case PCRE2_CONFIG_HEAPLIMIT:
141 *((uint32_t *)where) = HEAP_LIMIT;
142 break;
143
144 case PCRE2_CONFIG_JIT:
145 #ifdef SUPPORT_JIT
146 *((uint32_t *)where) = 1;
147 #else
148 *((uint32_t *)where) = 0;
149 #endif
150 break;
151
152 case PCRE2_CONFIG_JITTARGET:
153 #ifdef SUPPORT_JIT
154 {
155 const char *v = PRIV(jit_get_target)();
156 return (int)(1 + ((where == NULL)?
157 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v)));
158 }
159 #else
160 return PCRE2_ERROR_BADOPTION;
161 #endif
162
163 case PCRE2_CONFIG_LINKSIZE:
164 *((uint32_t *)where) = (uint32_t)configured_link_size;
165 break;
166
167 case PCRE2_CONFIG_MATCHLIMIT:
168 *((uint32_t *)where) = MATCH_LIMIT;
169 break;
170
171 case PCRE2_CONFIG_NEWLINE:
172 *((uint32_t *)where) = NEWLINE_DEFAULT;
173 break;
174
175 case PCRE2_CONFIG_NEVER_BACKSLASH_C:
176 #ifdef NEVER_BACKSLASH_C
177 *((uint32_t *)where) = 1;
178 #else
179 *((uint32_t *)where) = 0;
180 #endif
181 break;
182
183 case PCRE2_CONFIG_PARENSLIMIT:
184 *((uint32_t *)where) = PARENS_NEST_LIMIT;
185 break;
186
187 /* This is now obsolete. The stack is no longer used via recursion for
188 handling backtracking in pcre2_match(). */
189
190 case PCRE2_CONFIG_STACKRECURSE:
191 *((uint32_t *)where) = 0;
192 break;
193
194 case PCRE2_CONFIG_UNICODE_VERSION:
195 {
196 #if defined SUPPORT_UNICODE
197 const char *v = PRIV(unicode_version);
198 #else
199 const char *v = "Unicode not supported";
200 #endif
201 return (int)(1 + ((where == NULL)?
202 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v)));
203 }
204 break;
205
206 case PCRE2_CONFIG_UNICODE:
207 #if defined SUPPORT_UNICODE
208 *((uint32_t *)where) = 1;
209 #else
210 *((uint32_t *)where) = 0;
211 #endif
212 break;
213
214 /* The hackery in setting "v" below is to cope with the case when
215 PCRE2_PRERELEASE is set to an empty string (which it is for real releases).
216 If the second alternative is used in this case, it does not leave a space
217 before the date. On the other hand, if all four macros are put into a single
218 XSTRING when PCRE2_PRERELEASE is not empty, an unwanted space is inserted.
219 There are problems using an "obvious" approach like this:
220
221 XSTRING(PCRE2_MAJOR) "." XSTRING(PCRE_MINOR)
222 XSTRING(PCRE2_PRERELEASE) " " XSTRING(PCRE_DATE)
223
224 because, when PCRE2_PRERELEASE is empty, this leads to an attempted expansion
225 of STRING(). The C standard states: "If (before argument substitution) any
226 argument consists of no preprocessing tokens, the behavior is undefined." It
227 turns out the gcc treats this case as a single empty string - which is what
228 we really want - but Visual C grumbles about the lack of an argument for the
229 macro. Unfortunately, both are within their rights. As there seems to be no
230 way to test for a macro's value being empty at compile time, we have to
231 resort to a runtime test. */
232
233 case PCRE2_CONFIG_VERSION:
234 {
235 const char *v = (XSTRING(Z PCRE2_PRERELEASE)[1] == 0)?
236 XSTRING(PCRE2_MAJOR.PCRE2_MINOR PCRE2_DATE) :
237 XSTRING(PCRE2_MAJOR.PCRE2_MINOR) XSTRING(PCRE2_PRERELEASE PCRE2_DATE);
238 return (int)(1 + ((where == NULL)?
239 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v)));
240 }
241 }
242
243 return 0;
244 }
245
246 /* End of pcre2_config.c */
247
