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

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Revision 305 - (hide annotations) (download)
Sun Jan 20 20:07:32 2008 UTC (6 years, 7 months ago) by ph10
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Update copyright year to 2008.

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 305 Copyright (c) 1997-2008 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 150 /* 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 150 returned. In principle, we could implement several newline "types", each
44     referring to a different set of newline characters. At present, PCRE supports
45 ph10 149 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 ph10 200 #ifdef HAVE_CONFIG_H
51 ph10 236 #include "config.h"
52 ph10 200 #endif
53 ph10 199
54 nigel 93 #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 ph10 149 type the newline type
68 nigel 93 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 ph10 150 _pcre_is_newline(const uschar *ptr, int type, const uschar *endptr,
77 ph10 149 int *lenptr, BOOL utf8)
78 nigel 93 {
79     int c;
80     if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
81 ph10 149
82     if (type == NLTYPE_ANYCRLF) switch(c)
83 nigel 93 {
84 ph10 149 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 nigel 93 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 ph10 149 type the newline type
118 nigel 93 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 ph10 150 _pcre_was_newline(const uschar *ptr, int type, const uschar *startptr,
127 ph10 149 int *lenptr, BOOL utf8)
128 nigel 93 {
129     int c;
130     ptr--;
131 ph10 207 #ifdef SUPPORT_UTF8
132 nigel 93 if (utf8)
133     {
134     BACKCHAR(ptr);
135     GETCHAR(c, ptr);
136     }
137     else c = *ptr;
138 ph10 208 #else /* no UTF-8 support */
139 ph10 207 c = *ptr;
140     #endif /* SUPPORT_UTF8 */
141 ph10 149
142     if (type == NLTYPE_ANYCRLF) switch(c)
143 nigel 93 {
144     case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
145     return TRUE; /* LF */
146 ph10 149 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 nigel 93 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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