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

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Revision 149 - (hide annotations) (download)
Mon Apr 16 15:28:08 2007 UTC (7 years, 4 months ago) by ph10
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File size: 5650 byte(s)
Add PCRE_NEWLINE_ANYCRLF.

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 ph10 149 /* This module contains internal functions for testing newlines when more than
42 nigel 93 one kind of newline is to be recognized. When a newline is found, its length is
43 ph10 149 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 nigel 93 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 ph10 149 type the newline type
64 nigel 93 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 ph10 149 _pcre_is_newline(const uschar *ptr, int type, const uschar *endptr,
73     int *lenptr, BOOL utf8)
74 nigel 93 {
75     int c;
76     if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
77 ph10 149
78     if (type == NLTYPE_ANYCRLF) switch(c)
79 nigel 93 {
80 ph10 149 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 nigel 93 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 ph10 149 type the newline type
114 nigel 93 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 ph10 149 _pcre_was_newline(const uschar *ptr, int type, const uschar *startptr,
123     int *lenptr, BOOL utf8)
124 nigel 93 {
125     int c;
126     ptr--;
127     if (utf8)
128     {
129     BACKCHAR(ptr);
130     GETCHAR(c, ptr);
131     }
132     else c = *ptr;
133 ph10 149
134     if (type == NLTYPE_ANYCRLF) switch(c)
135 nigel 93 {
136     case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
137     return TRUE; /* LF */
138 ph10 149 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 nigel 93 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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