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 */ 211
