Process Hacker
pcre_xclass.c
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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  Copyright (c) 1997-2010 University of Cambridge
10 
11 -----------------------------------------------------------------------------
12 Redistribution and use in source and binary forms, with or without
13 modification, are permitted provided that the following conditions are met:
14 
15  * Redistributions of source code must retain the above copyright notice,
16  this list of conditions and the following disclaimer.
17 
18  * 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 
22  * 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 
26 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
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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 -----------------------------------------------------------------------------
38 */
39 
40 
41 /* This module contains an internal function that is used to match an extended
42 class. It is used by both pcre_exec() and pcre_def_exec(). */
43 
44 
45 #define HAVE_CONFIG_H
46 #ifdef HAVE_CONFIG_H
47 #include "config.h"
48 #endif
49 
50 #include "pcre_internal.h"
51 
52 
53 /*************************************************
54 * Match character against an XCLASS *
55 *************************************************/
56 
57 /* This function is called to match a character against an extended class that
58 might contain values > 255 and/or Unicode properties.
59 
60 Arguments:
61  c the character
62  data points to the flag byte of the XCLASS data
63 
64 Returns: TRUE if character matches, else FALSE
65 */
66 
67 BOOL
68 _pcre_xclass(int c, const uschar *data)
69 {
70 int t;
71 BOOL negated = (*data & XCL_NOT) != 0;
72 
73 /* Character values < 256 are matched against a bitmap, if one is present. If
74 not, we still carry on, because there may be ranges that start below 256 in the
75 additional data. */
76 
77 if (c < 256)
78  {
79  if ((*data & XCL_MAP) != 0 && (data[1 + c/8] & (1 << (c&7))) != 0)
80  return !negated; /* char found */
81  }
82 
83 /* First skip the bit map if present. Then match against the list of Unicode
84 properties or large chars or ranges that end with a large char. We won't ever
85 encounter XCL_PROP or XCL_NOTPROP when UCP support is not compiled. */
86 
87 if ((*data++ & XCL_MAP) != 0) data += 32;
88 
89 while ((t = *data++) != XCL_END)
90  {
91  int x, y;
92  if (t == XCL_SINGLE)
93  {
94  GETCHARINC(x, data);
95  if (c == x) return !negated;
96  }
97  else if (t == XCL_RANGE)
98  {
99  GETCHARINC(x, data);
100  GETCHARINC(y, data);
101  if (c >= x && c <= y) return !negated;
102  }
103 
104 #ifdef SUPPORT_UCP
105  else /* XCL_PROP & XCL_NOTPROP */
106  {
107  const ucd_record *prop = GET_UCD(c);
108 
109  switch(*data)
110  {
111  case PT_ANY:
112  if (t == XCL_PROP) return !negated;
113  break;
114 
115  case PT_LAMP:
116  if ((prop->chartype == ucp_Lu || prop->chartype == ucp_Ll ||
117  prop->chartype == ucp_Lt) == (t == XCL_PROP)) return !negated;
118  break;
119 
120  case PT_GC:
121  if ((data[1] == _pcre_ucp_gentype[prop->chartype]) == (t == XCL_PROP))
122  return !negated;
123  break;
124 
125  case PT_PC:
126  if ((data[1] == prop->chartype) == (t == XCL_PROP)) return !negated;
127  break;
128 
129  case PT_SC:
130  if ((data[1] == prop->script) == (t == XCL_PROP)) return !negated;
131  break;
132 
133  case PT_ALNUM:
134  if ((_pcre_ucp_gentype[prop->chartype] == ucp_L ||
135  _pcre_ucp_gentype[prop->chartype] == ucp_N) == (t == XCL_PROP))
136  return !negated;
137  break;
138 
139  case PT_SPACE: /* Perl space */
140  if ((_pcre_ucp_gentype[prop->chartype] == ucp_Z ||
141  c == CHAR_HT || c == CHAR_NL || c == CHAR_FF || c == CHAR_CR)
142  == (t == XCL_PROP))
143  return !negated;
144  break;
145 
146  case PT_PXSPACE: /* POSIX space */
147  if ((_pcre_ucp_gentype[prop->chartype] == ucp_Z ||
148  c == CHAR_HT || c == CHAR_NL || c == CHAR_VT ||
149  c == CHAR_FF || c == CHAR_CR) == (t == XCL_PROP))
150  return !negated;
151  break;
152 
153  case PT_WORD:
154  if ((_pcre_ucp_gentype[prop->chartype] == ucp_L ||
155  _pcre_ucp_gentype[prop->chartype] == ucp_N || c == CHAR_UNDERSCORE)
156  == (t == XCL_PROP))
157  return !negated;
158  break;
159 
160  /* This should never occur, but compilers may mutter if there is no
161  default. */
162 
163  default:
164  return FALSE;
165  }
166 
167  data += 2;
168  }
169 #endif /* SUPPORT_UCP */
170  }
171 
172 return negated; /* char did not match */
173 }
174 
175 /* End of pcre_xclass.c */