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

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Revision 117 - (hide annotations) (download)
Fri Mar 9 15:59:06 2007 UTC (7 years, 7 months ago) by ph10
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Update copyright years to 2007.

1 nigel 93 /*************************************************
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 ph10 117 Copyright (c) 1997-2007 University of Cambridge
10 nigel 93
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     {
75     int c;
76     if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
77     switch(c)
78     {
79     case 0x000a: /* LF */
80     case 0x000b: /* VT */
81     case 0x000c: *lenptr = 1; return TRUE; /* FF */
82     case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
83     return TRUE; /* CR */
84     case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
85     case 0x2028: /* LS */
86     case 0x2029: *lenptr = 3; return TRUE; /* PS */
87     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     {
113     int c;
114     ptr--;
115     if (utf8)
116     {
117     BACKCHAR(ptr);
118     GETCHAR(c, ptr);
119     }
120     else c = *ptr;
121     switch(c)
122     {
123     case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
124     return TRUE; /* LF */
125     case 0x000b: /* VT */
126     case 0x000c: /* FF */
127     case 0x000d: *lenptr = 1; return TRUE; /* CR */
128     case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
129     case 0x2028: /* LS */
130     case 0x2029: *lenptr = 3; return TRUE; /* PS */
131     default: return FALSE;
132     }
133     }
134    
135     /* End of pcre_newline.c */

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