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
42 /* This module contains internal functions for testing newlines when more than
43 one kind of newline is to be recognized. When a newline is found, its length is
44 returned. In principle, we could implement several newline "types", each
45 referring to a different set of newline characters. At present, PCRE2 supports
46 only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF,
47 and NLTYPE_ANY. The full list of Unicode newline characters is taken from
48 http://unicode.org/unicode/reports/tr18/. */
49
50
51 #ifdef HAVE_CONFIG_H
52 #include "config.h"
53 #endif
54
55 #include "pcre2_internal.h"
56
57
58
59 /*************************************************
60 * Check for newline at given position *
61 *************************************************/
62
63 /* This function is called only via the IS_NEWLINE macro, which does so only
64 when the newline type is NLTYPE_ANY or NLTYPE_ANYCRLF. The case of a fixed
65 newline (NLTYPE_FIXED) is handled inline. It is guaranteed that the code unit
66 pointed to by ptr is less than the end of the string.
67
68 Arguments:
69 ptr pointer to possible newline
70 type the newline type
71 endptr pointer to the end of the string
72 lenptr where to return the length
73 utf TRUE if in utf mode
74
75 Returns: TRUE or FALSE
76 */
77
78 BOOL
PRIV(is_newline)79 PRIV(is_newline)(PCRE2_SPTR ptr, uint32_t type, PCRE2_SPTR endptr,
80 uint32_t *lenptr, BOOL utf)
81 {
82 uint32_t c;
83
84 #ifdef SUPPORT_UNICODE
85 if (utf) { GETCHAR(c, ptr); } else c = *ptr;
86 #else
87 (void)utf;
88 c = *ptr;
89 #endif /* SUPPORT_UNICODE */
90
91 if (type == NLTYPE_ANYCRLF) switch(c)
92 {
93 case CHAR_LF:
94 *lenptr = 1;
95 return TRUE;
96
97 case CHAR_CR:
98 *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
99 return TRUE;
100
101 default:
102 return FALSE;
103 }
104
105 /* NLTYPE_ANY */
106
107 else switch(c)
108 {
109 #ifdef EBCDIC
110 case CHAR_NEL:
111 #endif
112 case CHAR_LF:
113 case CHAR_VT:
114 case CHAR_FF:
115 *lenptr = 1;
116 return TRUE;
117
118 case CHAR_CR:
119 *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
120 return TRUE;
121
122 #ifndef EBCDIC
123 #if PCRE2_CODE_UNIT_WIDTH == 8
124 case CHAR_NEL:
125 *lenptr = utf? 2 : 1;
126 return TRUE;
127
128 case 0x2028: /* LS */
129 case 0x2029: /* PS */
130 *lenptr = 3;
131 return TRUE;
132
133 #else /* 16-bit or 32-bit code units */
134 case CHAR_NEL:
135 case 0x2028: /* LS */
136 case 0x2029: /* PS */
137 *lenptr = 1;
138 return TRUE;
139 #endif
140 #endif /* Not EBCDIC */
141
142 default:
143 return FALSE;
144 }
145 }
146
147
148
149 /*************************************************
150 * Check for newline at previous position *
151 *************************************************/
152
153 /* This function is called only via the WAS_NEWLINE macro, which does so only
154 when the newline type is NLTYPE_ANY or NLTYPE_ANYCRLF. The case of a fixed
155 newline (NLTYPE_FIXED) is handled inline. It is guaranteed that the initial
156 value of ptr is greater than the start of the string that is being processed.
157
158 Arguments:
159 ptr pointer to possible newline
160 type the newline type
161 startptr pointer to the start of the string
162 lenptr where to return the length
163 utf TRUE if in utf mode
164
165 Returns: TRUE or FALSE
166 */
167
168 BOOL
PRIV(was_newline)169 PRIV(was_newline)(PCRE2_SPTR ptr, uint32_t type, PCRE2_SPTR startptr,
170 uint32_t *lenptr, BOOL utf)
171 {
172 uint32_t c;
173 ptr--;
174
175 #ifdef SUPPORT_UNICODE
176 if (utf)
177 {
178 BACKCHAR(ptr);
179 GETCHAR(c, ptr);
180 }
181 else c = *ptr;
182 #else
183 (void)utf;
184 c = *ptr;
185 #endif /* SUPPORT_UNICODE */
186
187 if (type == NLTYPE_ANYCRLF) switch(c)
188 {
189 case CHAR_LF:
190 *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
191 return TRUE;
192
193 case CHAR_CR:
194 *lenptr = 1;
195 return TRUE;
196
197 default:
198 return FALSE;
199 }
200
201 /* NLTYPE_ANY */
202
203 else switch(c)
204 {
205 case CHAR_LF:
206 *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
207 return TRUE;
208
209 #ifdef EBCDIC
210 case CHAR_NEL:
211 #endif
212 case CHAR_VT:
213 case CHAR_FF:
214 case CHAR_CR:
215 *lenptr = 1;
216 return TRUE;
217
218 #ifndef EBCDIC
219 #if PCRE2_CODE_UNIT_WIDTH == 8
220 case CHAR_NEL:
221 *lenptr = utf? 2 : 1;
222 return TRUE;
223
224 case 0x2028: /* LS */
225 case 0x2029: /* PS */
226 *lenptr = 3;
227 return TRUE;
228
229 #else /* 16-bit or 32-bit code units */
230 case CHAR_NEL:
231 case 0x2028: /* LS */
232 case 0x2029: /* PS */
233 *lenptr = 1;
234 return TRUE;
235 #endif
236 #endif /* Not EBCDIC */
237
238 default:
239 return FALSE;
240 }
241 }
242
243 /* End of pcre2_newline.c */
244
