pcre  8.32
About: PCRE - Perl-compatible regular expressions
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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) 1997-2012 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 #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
63 string that is being processed.
64 
65 Arguments:
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 
72 Returns: TRUE or FALSE
73 */
74 
75 BOOL
76 PRIV(is_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR endptr, int *lenptr,
77  BOOL utf)
78 {
79 pcre_uint32 c;
80 (void)utf;
81 #ifdef SUPPORT_UTF
82 if (utf)
83  {
84  GETCHAR(c, ptr);
85  }
86 else
87 #endif /* SUPPORT_UTF */
88  c = *ptr;
89 
90 /* Note that this function is called only for ANY or ANYCRLF. */
91 
92 if (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 
102 else 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
138 the string that is being processed.
139 
140 Arguments:
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 
147 Returns: TRUE or FALSE
148 */
149 
150 BOOL
151 PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
152  BOOL utf)
153 {
154 pcre_uint32 c;
155 (void)utf;
156 ptr--;
157 #ifdef SUPPORT_UTF
158 if (utf)
159  {
160  BACKCHAR(ptr);
161  GETCHAR(c, ptr);
162  }
163 else
164 #endif /* SUPPORT_UTF */
165  c = *ptr;
166 
167 /* Note that this function is called only for ANY or ANYCRLF. */
168 
169 if (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 
181 else 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 */