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Root/pcre/pcre_newline.c

1/*************************************************
2* Perl-Compatible Regular Expressions *
3*************************************************/
4
5/* PCRE is a library of functions to support regular expressions whose syntax
6and semantics are as close as possible to those of the Perl 5 language.
7
8 Written by Philip Hazel
9 Copyright (c) 1997-2008 University of Cambridge
10
11-----------------------------------------------------------------------------
12Redistribution and use in source and binary forms, with or without
13modification, 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
26THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36POSSIBILITY OF SUCH DAMAGE.
37-----------------------------------------------------------------------------
38*/
39
40
41/* This module contains internal functions for testing newlines when more than
42one kind of newline is to be recognized. When a newline is found, its length is
43returned. In principle, we could implement several newline "types", each
44referring to a different set of newline characters. At present, PCRE supports
45only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF,
46and NLTYPE_ANY. The full list of Unicode newline characters is taken from
47http://unicode.org/unicode/reports/tr18/. */
48
49
50#include "pcre_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
61string that is being processed.
62
63Arguments:
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 utf8 TRUE if in utf8 mode
69
70Returns: TRUE or FALSE
71*/
72
73BOOL
74_pcre_is_newline(const uschar *ptr, int type, const uschar *endptr,
75 int *lenptr, BOOL utf8)
76{
77int c;
78if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
79
80if (type == NLTYPE_ANYCRLF) switch(c)
81 {
82 case 0x000a: *lenptr = 1; return TRUE; /* LF */
83 case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
84 return TRUE; /* CR */
85 default: return FALSE;
86 }
87
88/* NLTYPE_ANY */
89
90else switch(c)
91 {
92 case 0x000a: /* LF */
93 case 0x000b: /* VT */
94 case 0x000c: *lenptr = 1; return TRUE; /* FF */
95 case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
96 return TRUE; /* CR */
97 case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
98 case 0x2028: /* LS */
99 case 0x2029: *lenptr = 3; return TRUE; /* PS */
100 default: return FALSE;
101 }
102}
103
104
105
106/*************************************************
107* Check for newline at previous position *
108*************************************************/
109
110/* It is guaranteed that the initial value of ptr is greater than the start of
111the string that is being processed.
112
113Arguments:
114 ptr pointer to possible newline
115 type the newline type
116 startptr pointer to the start of the string
117 lenptr where to return the length
118 utf8 TRUE if in utf8 mode
119
120Returns: TRUE or FALSE
121*/
122
123BOOL
124_pcre_was_newline(const uschar *ptr, int type, const uschar *startptr,
125 int *lenptr, BOOL utf8)
126{
127int c;
128ptr--;
129#ifdef SUPPORT_UTF8
130if (utf8)
131 {
132 BACKCHAR(ptr);
133 GETCHAR(c, ptr);
134 }
135else c = *ptr;
136#else /* no UTF-8 support */
137c = *ptr;
138#endif /* SUPPORT_UTF8 */
139
140if (type == NLTYPE_ANYCRLF) switch(c)
141 {
142 case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
143 return TRUE; /* LF */
144 case 0x000d: *lenptr = 1; return TRUE; /* CR */
145 default: return FALSE;
146 }
147
148else switch(c)
149 {
150 case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
151 return TRUE; /* LF */
152 case 0x000b: /* VT */
153 case 0x000c: /* FF */
154 case 0x000d: *lenptr = 1; return TRUE; /* CR */
155 case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
156 case 0x2028: /* LS */
157 case 0x2029: *lenptr = 3; return TRUE; /* PS */
158 default: return FALSE;
159 }
160}
161
162/* End of pcre_newline.c */

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