xref: /PHP-7.0/ext/pcre/pcrelib/pcre_newline.c (revision 5f9df47e)
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 #include "config.h"
51 
52 #include "pcre_internal.h"
53 
54 
55 
56 /*************************************************
57 *      Check for newline at given position       *
58 *************************************************/
59 
60 /* It is guaranteed that the initial value of ptr is less than the end of the
61 string that is being processed.
62 
63 Arguments:
64   ptr          pointer to possible newline
65   type         the newline type
66   endptr       pointer to the end of the string
67   lenptr       where to return the length
68   utf          TRUE if in utf mode
69 
70 Returns:       TRUE or FALSE
71 */
72 
73 BOOL
PRIV(is_newline)74 PRIV(is_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR endptr, int *lenptr,
75   BOOL utf)
76 {
77 pcre_uint32 c;
78 (void)utf;
79 #ifdef SUPPORT_UTF
80 if (utf)
81   {
82   GETCHAR(c, ptr);
83   }
84 else
85 #endif  /* SUPPORT_UTF */
86   c = *ptr;
87 
88 /* Note that this function is called only for ANY or ANYCRLF. */
89 
90 if (type == NLTYPE_ANYCRLF) switch(c)
91   {
92   case CHAR_LF: *lenptr = 1; return TRUE;
93   case CHAR_CR: *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
94                return TRUE;
95   default: return FALSE;
96   }
97 
98 /* NLTYPE_ANY */
99 
100 else switch(c)
101   {
102 #ifdef EBCDIC
103   case CHAR_NEL:
104 #endif
105   case CHAR_LF:
106   case CHAR_VT:
107   case CHAR_FF: *lenptr = 1; return TRUE;
108 
109   case CHAR_CR:
110   *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1;
111   return TRUE;
112 
113 #ifndef EBCDIC
114 #ifdef COMPILE_PCRE8
115   case CHAR_NEL: *lenptr = utf? 2 : 1; return TRUE;
116   case 0x2028:                                       /* LS */
117   case 0x2029: *lenptr = 3; return TRUE;             /* PS */
118 #else /* COMPILE_PCRE16 || COMPILE_PCRE32 */
119   case CHAR_NEL:
120   case 0x2028:                                       /* LS */
121   case 0x2029: *lenptr = 1; return TRUE;             /* PS */
122 #endif  /* COMPILE_PCRE8 */
123 #endif  /* Not EBCDIC */
124 
125   default: return FALSE;
126   }
127 }
128 
129 
130 
131 /*************************************************
132 *     Check for newline at previous position     *
133 *************************************************/
134 
135 /* It is guaranteed that the initial value of ptr is greater than the start of
136 the string that is being processed.
137 
138 Arguments:
139   ptr          pointer to possible newline
140   type         the newline type
141   startptr     pointer to the start of the string
142   lenptr       where to return the length
143   utf          TRUE if in utf mode
144 
145 Returns:       TRUE or FALSE
146 */
147 
148 BOOL
PRIV(was_newline)149 PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
150   BOOL utf)
151 {
152 pcre_uint32 c;
153 (void)utf;
154 ptr--;
155 #ifdef SUPPORT_UTF
156 if (utf)
157   {
158   BACKCHAR(ptr);
159   GETCHAR(c, ptr);
160   }
161 else
162 #endif  /* SUPPORT_UTF */
163   c = *ptr;
164 
165 /* Note that this function is called only for ANY or ANYCRLF. */
166 
167 if (type == NLTYPE_ANYCRLF) switch(c)
168   {
169   case CHAR_LF:
170   *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
171   return TRUE;
172 
173   case CHAR_CR: *lenptr = 1; return TRUE;
174   default: return FALSE;
175   }
176 
177 /* NLTYPE_ANY */
178 
179 else switch(c)
180   {
181   case CHAR_LF:
182   *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1;
183   return TRUE;
184 
185 #ifdef EBCDIC
186   case CHAR_NEL:
187 #endif
188   case CHAR_VT:
189   case CHAR_FF:
190   case CHAR_CR: *lenptr = 1; return TRUE;
191 
192 #ifndef EBCDIC
193 #ifdef COMPILE_PCRE8
194   case CHAR_NEL: *lenptr = utf? 2 : 1; return TRUE;
195   case 0x2028:                                       /* LS */
196   case 0x2029: *lenptr = 3; return TRUE;             /* PS */
197 #else /* COMPILE_PCRE16 || COMPILE_PCRE32 */
198   case CHAR_NEL:
199   case 0x2028:                                       /* LS */
200   case 0x2029: *lenptr = 1; return TRUE;             /* PS */
201 #endif  /* COMPILE_PCRE8 */
202 #endif  /* NotEBCDIC */
203 
204   default: return FALSE;
205   }
206 }
207 
208 /* End of pcre_newline.c */
209