pcre_newline.c revision f73ff17bddb7dc18ff9044773dd65d040e8f4fcf 
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{
79pcre_uint32 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
90/* Note that this function is called only for ANY or ANYCRLF. */
91
92if (type == NLTYPE_ANYCRLF) switch(c)
93  {
94  case CHAR_LF: *lenptr = 1; return TRUE;
95  case CHAR_CR: *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
96               return TRUE;
97  default: return FALSE;
98  }
99
100/* NLTYPE_ANY */
101
102else switch(c)
103  {
104#ifdef EBCDIC
105  case CHAR_NEL:
106#endif
107  case CHAR_LF:
108  case CHAR_VT:
109  case CHAR_FF: *lenptr = 1; return TRUE;
110
111  case CHAR_CR:
112  *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
113  return TRUE;
114
115#ifndef EBCDIC
116#ifdef COMPILE_PCRE8
117  case CHAR_NEL: *lenptr = utf? 2 : 1; return TRUE;
118  case 0x2028:                                       /* LS */
119  case 0x2029: *lenptr = 3; return TRUE;             /* PS */
120#else /* COMPILE_PCRE16 || COMPILE_PCRE32 */
121  case CHAR_NEL:
122  case 0x2028:                                       /* LS */
123  case 0x2029: *lenptr = 1; return TRUE;             /* PS */
124#endif  /* COMPILE_PCRE8 */
125#endif  /* Not EBCDIC */
126
127  default: return FALSE;
128  }
129}
130
131
132
133/*************************************************
134*     Check for newline at previous position     *
135*************************************************/
136
137/* It is guaranteed that the initial value of ptr is greater than the start of
138the string that is being processed.
139
140Arguments:
141  ptr          pointer to possible newline
142  type         the newline type
143  startptr     pointer to the start of the string
144  lenptr       where to return the length
145  utf          TRUE if in utf mode
146
147Returns:       TRUE or FALSE
148*/
149
150BOOL
151PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
152  BOOL utf)
153{
154pcre_uint32 c;
155(void)utf;
156ptr--;
157#ifdef SUPPORT_UTF
158if (utf)
159  {
160  BACKCHAR(ptr);
161  GETCHAR(c, ptr);
162  }
163else
164#endif  /* SUPPORT_UTF */
165  c = *ptr;
166
167/* Note that this function is called only for ANY or ANYCRLF. */
168
169if (type == NLTYPE_ANYCRLF) switch(c)
170  {
171  case CHAR_LF:
172  *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
173  return TRUE;
174
175  case CHAR_CR: *lenptr = 1; return TRUE;
176  default: return FALSE;
177  }
178
179/* NLTYPE_ANY */
180
181else switch(c)
182  {
183  case CHAR_LF:
184  *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
185  return TRUE;
186
187#ifdef EBCDIC
188  case CHAR_NEL:
189#endif
190  case CHAR_VT:
191  case CHAR_FF:
192  case CHAR_CR: *lenptr = 1; return TRUE;
193
194#ifndef EBCDIC
195#ifdef COMPILE_PCRE8
196  case CHAR_NEL: *lenptr = utf? 2 : 1; return TRUE;
197  case 0x2028:                                       /* LS */
198  case 0x2029: *lenptr = 3; return TRUE;             /* PS */
199#else /* COMPILE_PCRE16 || COMPILE_PCRE32 */
200  case CHAR_NEL:
201  case 0x2028:                                       /* LS */
202  case 0x2029: *lenptr = 1; return TRUE;             /* PS */
203#endif  /* COMPILE_PCRE8 */
204#endif  /* NotEBCDIC */
205
206  default: return FALSE;
207  }
208}
209
210/* End of pcre_newline.c */
211