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) 1997-2012 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
31 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 internal functions for testing newlines when more than
42 one kind of newline is to be recognized. When a newline is found, its length is
43 returned. In principle, we could implement several newline "types", each
44 referring to a different set of newline characters. At present, PCRE supports
45 only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF,
46 and NLTYPE_ANY. The full list of Unicode newline characters is taken from
47 http://unicode.org/unicode/reports/tr18/. */
48
49
50 #ifdef HAVE_CONFIG_H
51 #include "config.h"
52 #endif
53
54 #include "pcre_internal.h"
55
56
57
58 /*************************************************
59 * Check for newline at given position *
60 *************************************************/
61
62 /* It is guaranteed that the initial value of ptr is less than the end of the
63 string that is being processed.
64
65 Arguments:
66 ptr pointer to possible newline
67 type the newline type
68 endptr pointer to the end of the string
69 lenptr where to return the length
70 utf TRUE if in utf mode
71
72 Returns: TRUE or FALSE
73 */
74
75 BOOL
PRIV(is_newline)76 PRIV(is_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR endptr, int *lenptr,
77 BOOL utf)
78 {
79 pcre_uint32 c;
80 (void)utf;
81 #ifdef SUPPORT_UTF
82 if (utf)
83 {
84 GETCHAR(c, ptr);
85 }
86 else
87 #endif /* SUPPORT_UTF */
88 c = *ptr;
89
90 /* Note that this function is called only for ANY or ANYCRLF. */
91
92 if (type == NLTYPE_ANYCRLF) switch(c)
93 {
94 case CHAR_LF: *lenptr = 1; return TRUE;
95 case CHAR_CR: *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
96 return TRUE;
97 default: return FALSE;
98 }
99
100 /* NLTYPE_ANY */
101
102 else switch(c)
103 {
104 #ifdef EBCDIC
105 case CHAR_NEL:
106 #endif
107 case CHAR_LF:
108 case CHAR_VT:
109 case CHAR_FF: *lenptr = 1; return TRUE;
110
111 case CHAR_CR:
112 *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
113 return TRUE;
114
115 #ifndef EBCDIC
116 #ifdef COMPILE_PCRE8
117 case CHAR_NEL: *lenptr = utf? 2 : 1; return TRUE;
118 case 0x2028: /* LS */
119 case 0x2029: *lenptr = 3; return TRUE; /* PS */
120 #else /* COMPILE_PCRE16 || COMPILE_PCRE32 */
121 case CHAR_NEL:
122 case 0x2028: /* LS */
123 case 0x2029: *lenptr = 1; return TRUE; /* PS */
124 #endif /* COMPILE_PCRE8 */
125 #endif /* Not EBCDIC */
126
127 default: return FALSE;
128 }
129 }
130
131
132
133 /*************************************************
134 * Check for newline at previous position *
135 *************************************************/
136
137 /* It is guaranteed that the initial value of ptr is greater than the start of
138 the string that is being processed.
139
140 Arguments:
141 ptr pointer to possible newline
142 type the newline type
143 startptr pointer to the start of the string
144 lenptr where to return the length
145 utf TRUE if in utf mode
146
147 Returns: TRUE or FALSE
148 */
149
150 BOOL
PRIV(was_newline)151 PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
152 BOOL utf)
153 {
154 pcre_uint32 c;
155 (void)utf;
156 ptr--;
157 #ifdef SUPPORT_UTF
158 if (utf)
159 {
160 BACKCHAR(ptr);
161 GETCHAR(c, ptr);
162 }
163 else
164 #endif /* SUPPORT_UTF */
165 c = *ptr;
166
167 /* Note that this function is called only for ANY or ANYCRLF. */
168
169 if (type == NLTYPE_ANYCRLF) switch(c)
170 {
171 case CHAR_LF:
172 *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
173 return TRUE;
174
175 case CHAR_CR: *lenptr = 1; return TRUE;
176 default: return FALSE;
177 }
178
179 /* NLTYPE_ANY */
180
181 else switch(c)
182 {
183 case CHAR_LF:
184 *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
185 return TRUE;
186
187 #ifdef EBCDIC
188 case CHAR_NEL:
189 #endif
190 case CHAR_VT:
191 case CHAR_FF:
192 case CHAR_CR: *lenptr = 1; return TRUE;
193
194 #ifndef EBCDIC
195 #ifdef COMPILE_PCRE8
196 case CHAR_NEL: *lenptr = utf? 2 : 1; return TRUE;
197 case 0x2028: /* LS */
198 case 0x2029: *lenptr = 3; return TRUE; /* PS */
199 #else /* COMPILE_PCRE16 || COMPILE_PCRE32 */
200 case CHAR_NEL:
201 case 0x2028: /* LS */
202 case 0x2029: *lenptr = 1; return TRUE; /* PS */
203 #endif /* COMPILE_PCRE8 */
204 #endif /* NotEBCDIC */
205
206 default: return FALSE;
207 }
208 }
209
210 /* End of pcre_newline.c */
211