Tristan Matthews | 0461646 | 2013-11-14 16:09:34 -0500 | [diff] [blame] | 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 | #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 | utf8 TRUE if in utf8 mode |
| 71 | |
| 72 | Returns: TRUE or FALSE |
| 73 | */ |
| 74 | |
| 75 | BOOL |
| 76 | _pcre_is_newline(USPTR ptr, int type, USPTR endptr, int *lenptr, BOOL utf8) |
| 77 | { |
| 78 | int c; |
| 79 | if (utf8) { GETCHAR(c, ptr); } else c = *ptr; |
| 80 | |
| 81 | if (type == NLTYPE_ANYCRLF) switch(c) |
| 82 | { |
| 83 | case 0x000a: *lenptr = 1; return TRUE; /* LF */ |
| 84 | case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1; |
| 85 | return TRUE; /* CR */ |
| 86 | default: return FALSE; |
| 87 | } |
| 88 | |
| 89 | /* NLTYPE_ANY */ |
| 90 | |
| 91 | else switch(c) |
| 92 | { |
| 93 | case 0x000a: /* LF */ |
| 94 | case 0x000b: /* VT */ |
| 95 | case 0x000c: *lenptr = 1; return TRUE; /* FF */ |
| 96 | case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1; |
| 97 | return TRUE; /* CR */ |
| 98 | case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */ |
| 99 | case 0x2028: /* LS */ |
| 100 | case 0x2029: *lenptr = 3; return TRUE; /* PS */ |
| 101 | default: return FALSE; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | |
| 106 | |
| 107 | /************************************************* |
| 108 | * Check for newline at previous position * |
| 109 | *************************************************/ |
| 110 | |
| 111 | /* It is guaranteed that the initial value of ptr is greater than the start of |
| 112 | the string that is being processed. |
| 113 | |
| 114 | Arguments: |
| 115 | ptr pointer to possible newline |
| 116 | type the newline type |
| 117 | startptr pointer to the start of the string |
| 118 | lenptr where to return the length |
| 119 | utf8 TRUE if in utf8 mode |
| 120 | |
| 121 | Returns: TRUE or FALSE |
| 122 | */ |
| 123 | |
| 124 | BOOL |
| 125 | _pcre_was_newline(USPTR ptr, int type, USPTR startptr, int *lenptr, BOOL utf8) |
| 126 | { |
| 127 | int c; |
| 128 | ptr--; |
| 129 | #ifdef SUPPORT_UTF8 |
| 130 | if (utf8) |
| 131 | { |
| 132 | BACKCHAR(ptr); |
| 133 | GETCHAR(c, ptr); |
| 134 | } |
| 135 | else c = *ptr; |
| 136 | #else /* no UTF-8 support */ |
| 137 | c = *ptr; |
| 138 | #endif /* SUPPORT_UTF8 */ |
| 139 | |
| 140 | if (type == NLTYPE_ANYCRLF) switch(c) |
| 141 | { |
| 142 | case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1; |
| 143 | return TRUE; /* LF */ |
| 144 | case 0x000d: *lenptr = 1; return TRUE; /* CR */ |
| 145 | default: return FALSE; |
| 146 | } |
| 147 | |
| 148 | else switch(c) |
| 149 | { |
| 150 | case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1; |
| 151 | return TRUE; /* LF */ |
| 152 | case 0x000b: /* VT */ |
| 153 | case 0x000c: /* FF */ |
| 154 | case 0x000d: *lenptr = 1; return TRUE; /* CR */ |
| 155 | case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */ |
| 156 | case 0x2028: /* LS */ |
| 157 | case 0x2029: *lenptr = 3; return TRUE; /* PS */ |
| 158 | default: return FALSE; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | /* End of pcre_newline.c */ |