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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