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 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_JIT:
88 case PCRE2_CONFIG_LINKSIZE:
89 case PCRE2_CONFIG_MATCHLIMIT:
90 case PCRE2_CONFIG_NEWLINE:
91 case PCRE2_CONFIG_PARENSLIMIT:
92 case PCRE2_CONFIG_RECURSIONLIMIT:
93 case PCRE2_CONFIG_STACKRECURSE:
94 case PCRE2_CONFIG_UNICODE:
95 return sizeof(uint32_t);
96
97 /* These are handled below */
98
99 case PCRE2_CONFIG_JITTARGET:
100 case PCRE2_CONFIG_UNICODE_VERSION:
101 case PCRE2_CONFIG_VERSION:
102 break;
103 }
104 }
105
106 switch (what)
107 {
108 default:
109 return PCRE2_ERROR_BADOPTION;
110
111 case PCRE2_CONFIG_BSR:
112 #ifdef BSR_ANYCRLF
113 *((uint32_t *)where) = PCRE2_BSR_ANYCRLF;
114 #else
115 *((uint32_t *)where) = PCRE2_BSR_UNICODE;
116 #endif
117 break;
118
119 case PCRE2_CONFIG_JIT:
120 #ifdef SUPPORT_JIT
121 *((uint32_t *)where) = 1;
122 #else
123 *((uint32_t *)where) = 0;
124 #endif
125 break;
126
127 case PCRE2_CONFIG_JITTARGET:
128 #ifdef SUPPORT_JIT
129 {
130 const char *v = PRIV(jit_get_target)();
131 return (int)(1 + ((where == NULL)?
132 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v)));
133 }
134 #else
135 return PCRE2_ERROR_BADOPTION;
136 #endif
137
138 case PCRE2_CONFIG_LINKSIZE:
139 *((uint32_t *)where) = (uint32_t)configured_link_size;
140 break;
141
142 case PCRE2_CONFIG_MATCHLIMIT:
143 *((uint32_t *)where) = MATCH_LIMIT;
144 break;
145
146 case PCRE2_CONFIG_NEWLINE:
147 *((uint32_t *)where) = NEWLINE_DEFAULT;
148 break;
149
150 case PCRE2_CONFIG_PARENSLIMIT:
151 *((uint32_t *)where) = PARENS_NEST_LIMIT;
152 break;
153
154 case PCRE2_CONFIG_RECURSIONLIMIT:
155 *((uint32_t *)where) = MATCH_LIMIT_RECURSION;
156 break;
157
158 case PCRE2_CONFIG_STACKRECURSE:
159 #ifdef HEAP_MATCH_RECURSE
160 *((uint32_t *)where) = 0;
161 #else
162 *((uint32_t *)where) = 1;
163 #endif
164 break;
165
166 case PCRE2_CONFIG_UNICODE_VERSION:
167 {
168 #if defined SUPPORT_UNICODE
169 const char *v = PRIV(unicode_version);
170 #else
171 const char *v = "Unicode not supported";
172 #endif
173 return (int)(1 + ((where == NULL)?
174 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v)));
175 }
176 break;
177
178 case PCRE2_CONFIG_UNICODE:
179 #if defined SUPPORT_UNICODE
180 *((uint32_t *)where) = 1;
181 #else
182 *((uint32_t *)where) = 0;
183 #endif
184 break;
185
186 /* The hackery in setting "v" below is to cope with the case when
187 PCRE2_PRERELEASE is set to an empty string (which it is for real releases).
188 If the second alternative is used in this case, it does not leave a space
189 before the date. On the other hand, if all four macros are put into a single
190 XSTRING when PCRE2_PRERELEASE is not empty, an unwanted space is inserted.
191 There are problems using an "obvious" approach like this:
192
193 XSTRING(PCRE2_MAJOR) "." XSTRING(PCRE_MINOR)
194 XSTRING(PCRE2_PRERELEASE) " " XSTRING(PCRE_DATE)
195
196 because, when PCRE2_PRERELEASE is empty, this leads to an attempted expansion
197 of STRING(). The C standard states: "If (before argument substitution) any
198 argument consists of no preprocessing tokens, the behavior is undefined." It
199 turns out the gcc treats this case as a single empty string - which is what
200 we really want - but Visual C grumbles about the lack of an argument for the
201 macro. Unfortunately, both are within their rights. As there seems to be no
202 way to test for a macro's value being empty at compile time, we have to
203 resort to a runtime test. */
204
205 case PCRE2_CONFIG_VERSION:
206 {
207 const char *v = (XSTRING(Z PCRE2_PRERELEASE)[1] == 0)?
208 XSTRING(PCRE2_MAJOR.PCRE2_MINOR PCRE2_DATE) :
209 XSTRING(PCRE2_MAJOR.PCRE2_MINOR) XSTRING(PCRE2_PRERELEASE PCRE2_DATE);
210 return (int)(1 + ((where == NULL)?
211 strlen(v) : PRIV(strcpy_c8)((PCRE2_UCHAR *)where, v)));
212 }
213 }
214
215 return 0;
216 }
217
218 /* End of pcre2_config.c */
219