/[pcre]/code/tags/pcre-7.1/pcre_newline.c
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Contents of /code/tags/pcre-7.1/pcre_newline.c

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Revision 156 - (show annotations) (download)
Tue Apr 24 13:49:23 2007 UTC (7 years, 4 months ago) by ph10
File MIME type: text/plain
File size: 5639 byte(s)
Tag the PCRE 7.1 release.

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) 1997-2007 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 "pcre_internal.h"
51
52
53
54 /*************************************************
55 * Check for newline at given position *
56 *************************************************/
57
58 /* It is guaranteed that the initial value of ptr is less than the end of the
59 string that is being processed.
60
61 Arguments:
62 ptr pointer to possible newline
63 type the newline type
64 endptr pointer to the end of the string
65 lenptr where to return the length
66 utf8 TRUE if in utf8 mode
67
68 Returns: TRUE or FALSE
69 */
70
71 BOOL
72 _pcre_is_newline(const uschar *ptr, int type, const uschar *endptr,
73 int *lenptr, BOOL utf8)
74 {
75 int c;
76 if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
77
78 if (type == NLTYPE_ANYCRLF) switch(c)
79 {
80 case 0x000a: *lenptr = 1; return TRUE; /* LF */
81 case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
82 return TRUE; /* CR */
83 default: return FALSE;
84 }
85
86 /* NLTYPE_ANY */
87
88 else switch(c)
89 {
90 case 0x000a: /* LF */
91 case 0x000b: /* VT */
92 case 0x000c: *lenptr = 1; return TRUE; /* FF */
93 case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
94 return TRUE; /* CR */
95 case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
96 case 0x2028: /* LS */
97 case 0x2029: *lenptr = 3; return TRUE; /* PS */
98 default: return FALSE;
99 }
100 }
101
102
103
104 /*************************************************
105 * Check for newline at previous position *
106 *************************************************/
107
108 /* It is guaranteed that the initial value of ptr is greater than the start of
109 the string that is being processed.
110
111 Arguments:
112 ptr pointer to possible newline
113 type the newline type
114 startptr pointer to the start of the string
115 lenptr where to return the length
116 utf8 TRUE if in utf8 mode
117
118 Returns: TRUE or FALSE
119 */
120
121 BOOL
122 _pcre_was_newline(const uschar *ptr, int type, const uschar *startptr,
123 int *lenptr, BOOL utf8)
124 {
125 int c;
126 ptr--;
127 if (utf8)
128 {
129 BACKCHAR(ptr);
130 GETCHAR(c, ptr);
131 }
132 else c = *ptr;
133
134 if (type == NLTYPE_ANYCRLF) switch(c)
135 {
136 case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
137 return TRUE; /* LF */
138 case 0x000d: *lenptr = 1; return TRUE; /* CR */
139 default: return FALSE;
140 }
141
142 else switch(c)
143 {
144 case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
145 return TRUE; /* LF */
146 case 0x000b: /* VT */
147 case 0x000c: /* FF */
148 case 0x000d: *lenptr = 1; return TRUE; /* CR */
149 case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
150 case 0x2028: /* LS */
151 case 0x2029: *lenptr = 3; return TRUE; /* PS */
152 default: return FALSE;
153 }
154 }
155
156 /* End of pcre_newline.c */

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