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pcre_newline.c
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1 /*************************************************
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  Copyright (c) 1997-2009 University of Cambridge
10 
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 /* This module contains internal functions for testing newlines when more than
42 one kind of newline is to be recognized. When a newline is found, its length is
43 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 http://unicode.org/unicode/reports/tr18/. */
48 
49 
50 #define HAVE_CONFIG_H
51 #ifdef HAVE_CONFIG_H
52 #include "config.h"
53 #endif
54 
55 #include "pcre_internal.h"
56 
57 
58 
59 /*************************************************
60 * Check for newline at given position *
61 *************************************************/
62 
63 /* It is guaranteed that the initial value of ptr is less than the end of the
64 string that is being processed.
65 
66 Arguments:
67  ptr pointer to possible newline
68  type the newline type
69  endptr pointer to the end of the string
70  lenptr where to return the length
71  utf8 TRUE if in utf8 mode
72 
73 Returns: TRUE or FALSE
74 */
75 
76 BOOL
77 _pcre_is_newline(USPTR ptr, int type, USPTR endptr, int *lenptr, BOOL utf8)
78 {
79 int c;
80 if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
81 
82 if (type == NLTYPE_ANYCRLF) switch(c)
83  {
84  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  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  type the newline type
118  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 _pcre_was_newline(USPTR ptr, int type, USPTR startptr, int *lenptr, BOOL utf8)
127 {
128 int c;
129 ptr--;
130 #ifdef SUPPORT_UTF8
131 if (utf8)
132  {
133  BACKCHAR(ptr);
134  GETCHAR(c, ptr);
135  }
136 else c = *ptr;
137 #else /* no UTF-8 support */
138 c = *ptr;
139 #endif /* SUPPORT_UTF8 */
140 
141 if (type == NLTYPE_ANYCRLF) switch(c)
142  {
143  case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
144  return TRUE; /* LF */
145  case 0x000d: *lenptr = 1; return TRUE; /* CR */
146  default: return FALSE;
147  }
148 
149 else switch(c)
150  {
151  case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
152  return TRUE; /* LF */
153  case 0x000b: /* VT */
154  case 0x000c: /* FF */
155  case 0x000d: *lenptr = 1; return TRUE; /* CR */
156  case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
157  case 0x2028: /* LS */
158  case 0x2029: *lenptr = 3; return TRUE; /* PS */
159  default: return FALSE;
160  }
161 }
162 
163 /* End of pcre_newline.c */