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) 1997-2012 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  utf          TRUE if in utf mode
71
72Returns:       TRUE or FALSE
73*/
74
75BOOL
76PRIV(is_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR endptr, int *lenptr,
77  BOOL utf)
78{
79int c;
80(void)utf;
81#ifdef SUPPORT_UTF
82if (utf)
83  {
84  GETCHAR(c, ptr);
85  }
86else
87#endif  /* SUPPORT_UTF */
88  c = *ptr;
89
90if (type == NLTYPE_ANYCRLF) switch(c)
91  {
92  case 0x000a: *lenptr = 1; return TRUE;             /* LF */
93  case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
94               return TRUE;                          /* CR */
95  default: return FALSE;
96  }
97
98/* NLTYPE_ANY */
99
100else switch(c)
101  {
102  case 0x000a:                                       /* LF */
103  case 0x000b:                                       /* VT */
104  case 0x000c: *lenptr = 1; return TRUE;             /* FF */
105  case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
106               return TRUE;                          /* CR */
107#ifdef COMPILE_PCRE8
108  case 0x0085: *lenptr = utf? 2 : 1; return TRUE;    /* NEL */
109  case 0x2028:                                       /* LS */
110  case 0x2029: *lenptr = 3; return TRUE;             /* PS */
111#else
112  case 0x0085:                                       /* NEL */
113  case 0x2028:                                       /* LS */
114  case 0x2029: *lenptr = 1; return TRUE;             /* PS */
115#endif /* COMPILE_PCRE8 */
116  default: return FALSE;
117  }
118}
119
120
121
122/*************************************************
123*     Check for newline at previous position     *
124*************************************************/
125
126/* It is guaranteed that the initial value of ptr is greater than the start of
127the string that is being processed.
128
129Arguments:
130  ptr          pointer to possible newline
131  type         the newline type
132  startptr     pointer to the start of the string
133  lenptr       where to return the length
134  utf          TRUE if in utf mode
135
136Returns:       TRUE or FALSE
137*/
138
139BOOL
140PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
141  BOOL utf)
142{
143int c;
144(void)utf;
145ptr--;
146#ifdef SUPPORT_UTF
147if (utf)
148  {
149  BACKCHAR(ptr);
150  GETCHAR(c, ptr);
151  }
152else
153#endif  /* SUPPORT_UTF */
154  c = *ptr;
155
156if (type == NLTYPE_ANYCRLF) switch(c)
157  {
158  case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
159               return TRUE;                         /* LF */
160  case 0x000d: *lenptr = 1; return TRUE;            /* CR */
161  default: return FALSE;
162  }
163
164else switch(c)
165  {
166  case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
167               return TRUE;                         /* LF */
168  case 0x000b:                                      /* VT */
169  case 0x000c:                                      /* FF */
170  case 0x000d: *lenptr = 1; return TRUE;            /* CR */
171#ifdef COMPILE_PCRE8
172  case 0x0085: *lenptr = utf? 2 : 1; return TRUE;   /* NEL */
173  case 0x2028:                                      /* LS */
174  case 0x2029: *lenptr = 3; return TRUE;            /* PS */
175#else
176  case 0x0085:                                       /* NEL */
177  case 0x2028:                                       /* LS */
178  case 0x2029: *lenptr = 1; return TRUE;             /* PS */
179#endif /* COMPILE_PCRE8 */
180  default: return FALSE;
181  }
182}
183
184/* End of pcre_newline.c */
185