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 #include "config.h"
51
52 #include "pcre_internal.h"
53
54
55
56 /*************************************************
57 * Check for newline at given position *
58 *************************************************/
59
60 /* It is guaranteed that the initial value of ptr is less than the end of the
61 string that is being processed.
62
63 Arguments:
64 ptr pointer to possible newline
65 type the newline type
66 endptr pointer to the end of the string
67 lenptr where to return the length
68 utf TRUE if in utf mode
69
70 Returns: TRUE or FALSE
71 */
72
73 BOOL
74 PRIV(is_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR endptr, int *lenptr,
75 BOOL utf)
76 {
77 pcre_uint32 c;
78 (void)utf;
79 #ifdef SUPPORT_UTF
80 if (utf)
81 {
82 GETCHAR(c, ptr);
83 }
84 else
85 #endif /* SUPPORT_UTF */
86 c = *ptr;
87
88 /* Note that this function is called only for ANY or ANYCRLF. */
89
90 if (type == NLTYPE_ANYCRLF) switch(c)
91 {
92 case CHAR_LF: *lenptr = 1; return TRUE;
93 case CHAR_CR: *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
94 return TRUE;
95 default: return FALSE;
96 }
97
98 /* NLTYPE_ANY */
99
100 else switch(c)
101 {
102 #ifdef EBCDIC
103 case CHAR_NEL:
104 #endif
105 case CHAR_LF:
106 case CHAR_VT:
107 case CHAR_FF: *lenptr = 1; return TRUE;
108
109 case CHAR_CR:
110 *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
111 return TRUE;
112
113 #ifndef EBCDIC
114 #ifdef COMPILE_PCRE8
115 case CHAR_NEL: *lenptr = utf? 2 : 1; return TRUE;
116 case 0x2028: /* LS */
117 case 0x2029: *lenptr = 3; return TRUE; /* PS */
118 #else /* COMPILE_PCRE16 || COMPILE_PCRE32 */
119 case CHAR_NEL:
120 case 0x2028: /* LS */
121 case 0x2029: *lenptr = 1; return TRUE; /* PS */
122 #endif /* COMPILE_PCRE8 */
123 #endif /* Not EBCDIC */
124
125 default: return FALSE;
126 }
127 }
128
129
130
131 /*************************************************
132 * Check for newline at previous position *
133 *************************************************/
134
135 /* It is guaranteed that the initial value of ptr is greater than the start of
136 the string that is being processed.
137
138 Arguments:
139 ptr pointer to possible newline
140 type the newline type
141 startptr pointer to the start of the string
142 lenptr where to return the length
143 utf TRUE if in utf mode
144
145 Returns: TRUE or FALSE
146 */
147
148 BOOL
149 PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
150 BOOL utf)
151 {
152 pcre_uint32 c;
153 (void)utf;
154 ptr--;
155 #ifdef SUPPORT_UTF
156 if (utf)
157 {
158 BACKCHAR(ptr);
159 GETCHAR(c, ptr);
160 }
161 else
162 #endif /* SUPPORT_UTF */
163 c = *ptr;
164
165 /* Note that this function is called only for ANY or ANYCRLF. */
166
167 if (type == NLTYPE_ANYCRLF) switch(c)
168 {
169 case CHAR_LF:
170 *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
171 return TRUE;
172
173 case CHAR_CR: *lenptr = 1; return TRUE;
174 default: return FALSE;
175 }
176
177 /* NLTYPE_ANY */
178
179 else switch(c)
180 {
181 case CHAR_LF:
182 *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
183 return TRUE;
184
185 #ifdef EBCDIC
186 case CHAR_NEL:
187 #endif
188 case CHAR_VT:
189 case CHAR_FF:
190 case CHAR_CR: *lenptr = 1; return TRUE;
191
192 #ifndef EBCDIC
193 #ifdef COMPILE_PCRE8
194 case CHAR_NEL: *lenptr = utf? 2 : 1; return TRUE;
195 case 0x2028: /* LS */
196 case 0x2029: *lenptr = 3; return TRUE; /* PS */
197 #else /* COMPILE_PCRE16 || COMPILE_PCRE32 */
198 case CHAR_NEL:
199 case 0x2028: /* LS */
200 case 0x2029: *lenptr = 1; return TRUE; /* PS */
201 #endif /* COMPILE_PCRE8 */
202 #endif /* NotEBCDIC */
203
204 default: return FALSE;
205 }
206 }
207
208 /* End of pcre_newline.c */