1/*************************************************
2*      Perl-Compatible Regular Expressions       *
3*************************************************/
4
5/* PCRE is a library of functions to support regular expressions whose syntax
6and semantics are as close as possible to those of the Perl 5 language.
7
8                       Written by Philip Hazel
9           Copyright (c) 1997-2009 University of Cambridge
10
11-----------------------------------------------------------------------------
12Redistribution and use in source and binary forms, with or without
13modification, 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
26THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
27AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
30LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36POSSIBILITY OF SUCH DAMAGE.
37-----------------------------------------------------------------------------
38*/
39
40
41/* This module contains internal functions for testing newlines when more than
42one kind of newline is to be recognized. When a newline is found, its length is
43returned. In principle, we could implement several newline "types", each
44referring to a different set of newline characters. At present, PCRE supports
45only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF,
46and NLTYPE_ANY. The full list of Unicode newline characters is taken from
47http://unicode.org/unicode/reports/tr18/. */
48
49
50#ifdef HAVE_CONFIG_H
51#include "config.h"
52#endif
53
54#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
63string that is being processed.
64
65Arguments:
66  ptr          pointer to possible newline
67  type         the newline type
68  endptr       pointer to the end of the string
69  lenptr       where to return the length
70  utf8         TRUE if in utf8 mode
71
72Returns:       TRUE or FALSE
73*/
74
75BOOL
76_pcre_is_newline(USPTR ptr, int type, USPTR endptr, int *lenptr, BOOL utf8)
77{
78int c;
79if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
80
81if (type == NLTYPE_ANYCRLF) switch(c)
82  {
83  case 0x000a: *lenptr = 1; return TRUE;             /* LF */
84  case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
85               return TRUE;                          /* CR */
86  default: return FALSE;
87  }
88
89/* NLTYPE_ANY */
90
91else switch(c)
92  {
93  case 0x000a:                                       /* LF */
94  case 0x000b:                                       /* VT */
95  case 0x000c: *lenptr = 1; return TRUE;             /* FF */
96  case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
97               return TRUE;                          /* CR */
98  case 0x0085: *lenptr = utf8? 2 : 1; return TRUE;   /* NEL */
99  case 0x2028:                                       /* LS */
100  case 0x2029: *lenptr = 3; return TRUE;             /* PS */
101  default: return FALSE;
102  }
103}
104
105
106
107/*************************************************
108*     Check for newline at previous position     *
109*************************************************/
110
111/* It is guaranteed that the initial value of ptr is greater than the start of
112the string that is being processed.
113
114Arguments:
115  ptr          pointer to possible newline
116  type         the newline type
117  startptr     pointer to the start of the string
118  lenptr       where to return the length
119  utf8         TRUE if in utf8 mode
120
121Returns:       TRUE or FALSE
122*/
123
124BOOL
125_pcre_was_newline(USPTR ptr, int type, USPTR startptr, int *lenptr, BOOL utf8)
126{
127int c;
128ptr--;
129#ifdef SUPPORT_UTF8
130if (utf8)
131  {
132  BACKCHAR(ptr);
133  GETCHAR(c, ptr);
134  }
135else c = *ptr;
136#else   /* no UTF-8 support */
137c = *ptr;
138#endif  /* SUPPORT_UTF8 */
139
140if (type == NLTYPE_ANYCRLF) switch(c)
141  {
142  case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
143               return TRUE;                         /* LF */
144  case 0x000d: *lenptr = 1; return TRUE;            /* CR */
145  default: return FALSE;
146  }
147
148else switch(c)
149  {
150  case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
151               return TRUE;                         /* LF */
152  case 0x000b:                                      /* VT */
153  case 0x000c:                                      /* FF */
154  case 0x000d: *lenptr = 1; return TRUE;            /* CR */
155  case 0x0085: *lenptr = utf8? 2 : 1; return TRUE;  /* NEL */
156  case 0x2028:                                      /* LS */
157  case 0x2029: *lenptr = 3; return TRUE;            /* PS */
158  default: return FALSE;
159  }
160}
161
162/* End of pcre_newline.c */
163