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 Original API code Copyright (c) 1997-2012 University of Cambridge 10 New API code Copyright (c) 2016 University of Cambridge 11 12 ----------------------------------------------------------------------------- 13 Redistribution and use in source and binary forms, with or without 14 modification, are permitted provided that the following conditions are met: 15 16 * Redistributions of source code must retain the above copyright notice, 17 this list of conditions and the following disclaimer. 18 19 * Redistributions in binary form must reproduce the above copyright 20 notice, this list of conditions and the following disclaimer in the 21 documentation and/or other materials provided with the distribution. 22 23 * Neither the name of the University of Cambridge nor the names of its 24 contributors may be used to endorse or promote products derived from 25 this software without specific prior written permission. 26 27 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 28 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 31 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 POSSIBILITY OF SUCH DAMAGE. 38 ----------------------------------------------------------------------------- 39 */ 40 41 42 /* This module contains internal functions for testing newlines when more than 43 one kind of newline is to be recognized. When a newline is found, its length is 44 returned. In principle, we could implement several newline "types", each 45 referring to a different set of newline characters. At present, PCRE2 supports 46 only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF, 47 and NLTYPE_ANY. The full list of Unicode newline characters is taken from 48 http://unicode.org/unicode/reports/tr18/. */ 49 50 51 #ifdef HAVE_CONFIG_H 52 #include "config.h" 53 #endif 54 55 #include "pcre2_internal.h" 56 57 58 59 /************************************************* 60 * Check for newline at given position * 61 *************************************************/ 62 63 /* This function is called only via the IS_NEWLINE macro, which does so only 64 when the newline type is NLTYPE_ANY or NLTYPE_ANYCRLF. The case of a fixed 65 newline (NLTYPE_FIXED) is handled inline. It is guaranteed that the code unit 66 pointed to by ptr is less than the end of the string. 67 68 Arguments: 69 ptr pointer to possible newline 70 type the newline type 71 endptr pointer to the end of the string 72 lenptr where to return the length 73 utf TRUE if in utf mode 74 75 Returns: TRUE or FALSE 76 */ 77 78 BOOL 79 PRIV(is_newline)(PCRE2_SPTR ptr, uint32_t type, PCRE2_SPTR endptr, 80 uint32_t *lenptr, BOOL utf) 81 { 82 uint32_t c; 83 84 #ifdef SUPPORT_UNICODE 85 if (utf) { GETCHAR(c, ptr); } else c = *ptr; 86 #else 87 (void)utf; 88 c = *ptr; 89 #endif /* SUPPORT_UNICODE */ 90 91 if (type == NLTYPE_ANYCRLF) switch(c) 92 { 93 case CHAR_LF: 94 *lenptr = 1; 95 return TRUE; 96 97 case CHAR_CR: 98 *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1; 99 return TRUE; 100 101 default: 102 return FALSE; 103 } 104 105 /* NLTYPE_ANY */ 106 107 else switch(c) 108 { 109 #ifdef EBCDIC 110 case CHAR_NEL: 111 #endif 112 case CHAR_LF: 113 case CHAR_VT: 114 case CHAR_FF: 115 *lenptr = 1; 116 return TRUE; 117 118 case CHAR_CR: 119 *lenptr = (ptr < endptr - 1 && ptr[1] == CHAR_LF)? 2 : 1; 120 return TRUE; 121 122 #ifndef EBCDIC 123 #if PCRE2_CODE_UNIT_WIDTH == 8 124 case CHAR_NEL: 125 *lenptr = utf? 2 : 1; 126 return TRUE; 127 128 case 0x2028: /* LS */ 129 case 0x2029: /* PS */ 130 *lenptr = 3; 131 return TRUE; 132 133 #else /* 16-bit or 32-bit code units */ 134 case CHAR_NEL: 135 case 0x2028: /* LS */ 136 case 0x2029: /* PS */ 137 *lenptr = 1; 138 return TRUE; 139 #endif 140 #endif /* Not EBCDIC */ 141 142 default: 143 return FALSE; 144 } 145 } 146 147 148 149 /************************************************* 150 * Check for newline at previous position * 151 *************************************************/ 152 153 /* This function is called only via the WAS_NEWLINE macro, which does so only 154 when the newline type is NLTYPE_ANY or NLTYPE_ANYCRLF. The case of a fixed 155 newline (NLTYPE_FIXED) is handled inline. It is guaranteed that the initial 156 value of ptr is greater than the start of the string that is being processed. 157 158 Arguments: 159 ptr pointer to possible newline 160 type the newline type 161 startptr pointer to the start of the string 162 lenptr where to return the length 163 utf TRUE if in utf mode 164 165 Returns: TRUE or FALSE 166 */ 167 168 BOOL 169 PRIV(was_newline)(PCRE2_SPTR ptr, uint32_t type, PCRE2_SPTR startptr, 170 uint32_t *lenptr, BOOL utf) 171 { 172 uint32_t c; 173 ptr--; 174 175 #ifdef SUPPORT_UNICODE 176 if (utf) 177 { 178 BACKCHAR(ptr); 179 GETCHAR(c, ptr); 180 } 181 else c = *ptr; 182 #else 183 (void)utf; 184 c = *ptr; 185 #endif /* SUPPORT_UNICODE */ 186 187 if (type == NLTYPE_ANYCRLF) switch(c) 188 { 189 case CHAR_LF: 190 *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1; 191 return TRUE; 192 193 case CHAR_CR: 194 *lenptr = 1; 195 return TRUE; 196 197 default: 198 return FALSE; 199 } 200 201 /* NLTYPE_ANY */ 202 203 else switch(c) 204 { 205 case CHAR_LF: 206 *lenptr = (ptr > startptr && ptr[-1] == CHAR_CR)? 2 : 1; 207 return TRUE; 208 209 #ifdef EBCDIC 210 case CHAR_NEL: 211 #endif 212 case CHAR_VT: 213 case CHAR_FF: 214 case CHAR_CR: 215 *lenptr = 1; 216 return TRUE; 217 218 #ifndef EBCDIC 219 #if PCRE2_CODE_UNIT_WIDTH == 8 220 case CHAR_NEL: 221 *lenptr = utf? 2 : 1; 222 return TRUE; 223 224 case 0x2028: /* LS */ 225 case 0x2029: /* PS */ 226 *lenptr = 3; 227 return TRUE; 228 229 #else /* 16-bit or 32-bit code units */ 230 case CHAR_NEL: 231 case 0x2028: /* LS */ 232 case 0x2029: /* PS */ 233 *lenptr = 1; 234 return TRUE; 235 #endif 236 #endif /* Not EBCDIC */ 237 238 default: 239 return FALSE; 240 } 241 } 242 243 /* End of pcre2_newline.c */ 244
