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
PRIV(is_newline)74 PRIV(is_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR endptr, int *lenptr,
75 BOOL utf)
76 {
77 int 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 if (type == NLTYPE_ANYCRLF) switch(c)
89 {
90 case 0x000a: *lenptr = 1; return TRUE; /* LF */
91 case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
92 return TRUE; /* CR */
93 default: return FALSE;
94 }
95
96 /* NLTYPE_ANY */
97
98 else switch(c)
99 {
100 case 0x000a: /* LF */
101 case 0x000b: /* VT */
102 case 0x000c: *lenptr = 1; return TRUE; /* FF */
103 case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
104 return TRUE; /* CR */
105 #ifdef COMPILE_PCRE8
106 case 0x0085: *lenptr = utf? 2 : 1; return TRUE; /* NEL */
107 case 0x2028: /* LS */
108 case 0x2029: *lenptr = 3; return TRUE; /* PS */
109 #else
110 case 0x0085: /* NEL */
111 case 0x2028: /* LS */
112 case 0x2029: *lenptr = 1; return TRUE; /* PS */
113 #endif /* COMPILE_PCRE8 */
114 default: return FALSE;
115 }
116 }
117
118
119
120 /*************************************************
121 * Check for newline at previous position *
122 *************************************************/
123
124 /* It is guaranteed that the initial value of ptr is greater than the start of
125 the string that is being processed.
126
127 Arguments:
128 ptr pointer to possible newline
129 type the newline type
130 startptr pointer to the start of the string
131 lenptr where to return the length
132 utf TRUE if in utf mode
133
134 Returns: TRUE or FALSE
135 */
136
137 BOOL
PRIV(was_newline)138 PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
139 BOOL utf)
140 {
141 int c;
142 (void)utf;
143 ptr--;
144 #ifdef SUPPORT_UTF
145 if (utf)
146 {
147 BACKCHAR(ptr);
148 GETCHAR(c, ptr);
149 }
150 else
151 #endif /* SUPPORT_UTF */
152 c = *ptr;
153
154 if (type == NLTYPE_ANYCRLF) switch(c)
155 {
156 case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
157 return TRUE; /* LF */
158 case 0x000d: *lenptr = 1; return TRUE; /* CR */
159 default: return FALSE;
160 }
161
162 else switch(c)
163 {
164 case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
165 return TRUE; /* LF */
166 case 0x000b: /* VT */
167 case 0x000c: /* FF */
168 case 0x000d: *lenptr = 1; return TRUE; /* CR */
169 #ifdef COMPILE_PCRE8
170 case 0x0085: *lenptr = utf? 2 : 1; return TRUE; /* NEL */
171 case 0x2028: /* LS */
172 case 0x2029: *lenptr = 3; return TRUE; /* PS */
173 #else
174 case 0x0085: /* NEL */
175 case 0x2028: /* LS */
176 case 0x2029: *lenptr = 1; return TRUE; /* PS */
177 #endif /* COMPILE_PCRE8 */
178 default: return FALSE;
179 }
180 }
181
182 /* End of pcre_newline.c */
183