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) 1997-2006 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, and NLTYPE_ALL,
46 : so for now the type isn't passed into the functions. It can easily be added
47 : later if required. The full list of Unicode newline characters is taken from
48 : http://unicode.org/unicode/reports/tr18/. */
49 :
50 :
51 : #include "pcre_internal.h"
52 :
53 :
54 :
55 : /*************************************************
56 : * Check for newline at given position *
57 : *************************************************/
58 :
59 : /* It is guaranteed that the initial value of ptr is less than the end of the
60 : string that is being processed.
61 :
62 : Arguments:
63 : ptr pointer to possible newline
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, const uschar *endptr, int *lenptr,
73 : BOOL utf8)
74 0 : {
75 : int c;
76 0 : if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
77 0 : switch(c)
78 : {
79 : case 0x000a: /* LF */
80 : case 0x000b: /* VT */
81 0 : case 0x000c: *lenptr = 1; return TRUE; /* FF */
82 0 : case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
83 0 : return TRUE; /* CR */
84 0 : case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
85 : case 0x2028: /* LS */
86 0 : case 0x2029: *lenptr = 3; return TRUE; /* PS */
87 0 : default: return FALSE;
88 : }
89 : }
90 :
91 :
92 :
93 : /*************************************************
94 : * Check for newline at previous position *
95 : *************************************************/
96 :
97 : /* It is guaranteed that the initial value of ptr is greater than the start of
98 : the string that is being processed.
99 :
100 : Arguments:
101 : ptr pointer to possible newline
102 : startptr pointer to the start of the string
103 : lenptr where to return the length
104 : utf8 TRUE if in utf8 mode
105 :
106 : Returns: TRUE or FALSE
107 : */
108 :
109 : BOOL
110 : _pcre_was_newline(const uschar *ptr, const uschar *startptr, int *lenptr,
111 : BOOL utf8)
112 0 : {
113 : int c;
114 0 : ptr--;
115 0 : if (utf8)
116 : {
117 0 : BACKCHAR(ptr);
118 0 : GETCHAR(c, ptr);
119 : }
120 0 : else c = *ptr;
121 0 : switch(c)
122 : {
123 0 : case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
124 0 : return TRUE; /* LF */
125 : case 0x000b: /* VT */
126 : case 0x000c: /* FF */
127 0 : case 0x000d: *lenptr = 1; return TRUE; /* CR */
128 0 : case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
129 : case 0x2028: /* LS */
130 0 : case 0x2029: *lenptr = 3; return TRUE; /* PS */
131 0 : default: return FALSE;
132 : }
133 : }
134 :
135 : /* End of pcre_newline.c */
|
