1 /* $Cambridge: exim/src/src/pcre/pcre_newline.c,v 1.3 2007/11/12 13:02:20 nm4 Exp $ */
3 /*************************************************
4 * Perl-Compatible Regular Expressions *
5 *************************************************/
7 /* PCRE is a library of functions to support regular expressions whose syntax
8 and semantics are as close as possible to those of the Perl 5 language.
10 Written by Philip Hazel
11 Copyright (c) 1997-2007 University of Cambridge
13 -----------------------------------------------------------------------------
14 Redistribution and use in source and binary forms, with or without
15 modification, are permitted provided that the following conditions are met:
17 * Redistributions of source code must retain the above copyright notice,
18 this list of conditions and the following disclaimer.
20 * Redistributions in binary form must reproduce the above copyright
21 notice, this list of conditions and the following disclaimer in the
22 documentation and/or other materials provided with the distribution.
24 * Neither the name of the University of Cambridge nor the names of its
25 contributors may be used to endorse or promote products derived from
26 this software without specific prior written permission.
28 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
29 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
32 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
34 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
35 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
36 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
37 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 POSSIBILITY OF SUCH DAMAGE.
39 -----------------------------------------------------------------------------
43 /* This module contains internal functions for testing newlines when more than
44 one kind of newline is to be recognized. When a newline is found, its length is
45 returned. In principle, we could implement several newline "types", each
46 referring to a different set of newline characters. At present, PCRE supports
47 only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF,
48 and NLTYPE_ANY. The full list of Unicode newline characters is taken from
49 http://unicode.org/unicode/reports/tr18/. */
56 #include "pcre_internal.h"
60 /*************************************************
61 * Check for newline at given position *
62 *************************************************/
64 /* It is guaranteed that the initial value of ptr is less than the end of the
65 string that is being processed.
68 ptr pointer to possible newline
70 endptr pointer to the end of the string
71 lenptr where to return the length
72 utf8 TRUE if in utf8 mode
74 Returns: TRUE or FALSE
78 _pcre_is_newline(const uschar *ptr, int type, const uschar *endptr,
79 int *lenptr, BOOL utf8)
82 if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
84 if (type == NLTYPE_ANYCRLF) switch(c)
86 case 0x000a: *lenptr = 1; return TRUE; /* LF */
87 case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
89 default: return FALSE;
98 case 0x000c: *lenptr = 1; return TRUE; /* FF */
99 case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
100 return TRUE; /* CR */
101 case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
102 case 0x2028: /* LS */
103 case 0x2029: *lenptr = 3; return TRUE; /* PS */
104 default: return FALSE;
110 /*************************************************
111 * Check for newline at previous position *
112 *************************************************/
114 /* It is guaranteed that the initial value of ptr is greater than the start of
115 the string that is being processed.
118 ptr pointer to possible newline
119 type the newline type
120 startptr pointer to the start of the string
121 lenptr where to return the length
122 utf8 TRUE if in utf8 mode
124 Returns: TRUE or FALSE
128 _pcre_was_newline(const uschar *ptr, int type, const uschar *startptr,
129 int *lenptr, BOOL utf8)
140 #else /* no UTF-8 support */
142 #endif /* SUPPORT_UTF8 */
144 if (type == NLTYPE_ANYCRLF) switch(c)
146 case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
147 return TRUE; /* LF */
148 case 0x000d: *lenptr = 1; return TRUE; /* CR */
149 default: return FALSE;
154 case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
155 return TRUE; /* LF */
156 case 0x000b: /* VT */
157 case 0x000c: /* FF */
158 case 0x000d: *lenptr = 1; return TRUE; /* CR */
159 case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
160 case 0x2028: /* LS */
161 case 0x2029: *lenptr = 3; return TRUE; /* PS */
162 default: return FALSE;
166 /* End of pcre_newline.c */