/[pcre]/code/trunk/pcre_newline.c
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Contents of /code/trunk/pcre_newline.c

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Revision 208 - (show annotations) (download)
Mon Aug 6 15:23:29 2007 UTC (7 years, 2 months ago) by ph10
File MIME type: text/plain
File size: 5776 byte(s)
Added a pcresyntax man page; tidied some others.

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 #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 utf8 TRUE if in utf8 mode
71
72 Returns: TRUE or FALSE
73 */
74
75 BOOL
76 _pcre_is_newline(const uschar *ptr, int type, const uschar *endptr,
77 int *lenptr, BOOL utf8)
78 {
79 int c;
80 if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
81
82 if (type == NLTYPE_ANYCRLF) switch(c)
83 {
84 case 0x000a: *lenptr = 1; return TRUE; /* LF */
85 case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
86 return TRUE; /* CR */
87 default: return FALSE;
88 }
89
90 /* NLTYPE_ANY */
91
92 else switch(c)
93 {
94 case 0x000a: /* LF */
95 case 0x000b: /* VT */
96 case 0x000c: *lenptr = 1; return TRUE; /* FF */
97 case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
98 return TRUE; /* CR */
99 case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
100 case 0x2028: /* LS */
101 case 0x2029: *lenptr = 3; return TRUE; /* PS */
102 default: return FALSE;
103 }
104 }
105
106
107
108 /*************************************************
109 * Check for newline at previous position *
110 *************************************************/
111
112 /* It is guaranteed that the initial value of ptr is greater than the start of
113 the string that is being processed.
114
115 Arguments:
116 ptr pointer to possible newline
117 type the newline type
118 startptr pointer to the start of the string
119 lenptr where to return the length
120 utf8 TRUE if in utf8 mode
121
122 Returns: TRUE or FALSE
123 */
124
125 BOOL
126 _pcre_was_newline(const uschar *ptr, int type, const uschar *startptr,
127 int *lenptr, BOOL utf8)
128 {
129 int c;
130 ptr--;
131 #ifdef SUPPORT_UTF8
132 if (utf8)
133 {
134 BACKCHAR(ptr);
135 GETCHAR(c, ptr);
136 }
137 else c = *ptr;
138 #else /* no UTF-8 support */
139 c = *ptr;
140 #endif /* SUPPORT_UTF8 */
141
142 if (type == NLTYPE_ANYCRLF) switch(c)
143 {
144 case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
145 return TRUE; /* LF */
146 case 0x000d: *lenptr = 1; return TRUE; /* CR */
147 default: return FALSE;
148 }
149
150 else switch(c)
151 {
152 case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
153 return TRUE; /* LF */
154 case 0x000b: /* VT */
155 case 0x000c: /* FF */
156 case 0x000d: *lenptr = 1; return TRUE; /* CR */
157 case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
158 case 0x2028: /* LS */
159 case 0x2029: *lenptr = 3; return TRUE; /* PS */
160 default: return FALSE;
161 }
162 }
163
164 /* End of pcre_newline.c */

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