glib/pcre/pcre_newline.c

   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
  74 PRIV(is_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR endptr, int *lenptr,
  75   BOOL utf)
  76 {
  77 int 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 if (type == NLTYPE_ANYCRLF) switch(c)
  89   {
  90   case 0x000a: *lenptr = 1; return TRUE;             /* LF */
  91   case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
  92                return TRUE;                          /* CR */
  93   default: return FALSE;
  94   }
  95
  96 /* NLTYPE_ANY */
  97
  98 else switch(c)
  99   {
 100   case 0x000a:                                       /* LF */
 101   case 0x000b:                                       /* VT */
 102   case 0x000c: *lenptr = 1; return TRUE;             /* FF */
 103   case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
 104                return TRUE;                          /* CR */
 105 #ifdef COMPILE_PCRE8
 106   case 0x0085: *lenptr = utf? 2 : 1; return TRUE;    /* NEL */
 107   case 0x2028:                                       /* LS */
 108   case 0x2029: *lenptr = 3; return TRUE;             /* PS */
 109 #else
 110   case 0x0085:                                       /* NEL */
 111   case 0x2028:                                       /* LS */
 112   case 0x2029: *lenptr = 1; return TRUE;             /* PS */
 113 #endif /* COMPILE_PCRE8 */
 114   default: return FALSE;
 115   }
 116 }
 117
 118
 119
 120 /*************************************************
 121 *     Check for newline at previous position     *
 122 *************************************************/
 123
 124 /* It is guaranteed that the initial value of ptr is greater than the start of
 125 the string that is being processed.
 126
 127 Arguments:
 128   ptr          pointer to possible newline
 129   type         the newline type
 130   startptr     pointer to the start of the string
 131   lenptr       where to return the length
 132   utf          TRUE if in utf mode
 133
 134 Returns:       TRUE or FALSE
 135 */
 136
 137 BOOL
 138 PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
 139   BOOL utf)
 140 {
 141 int c;
 142 (void)utf;
 143 ptr--;
 144 #ifdef SUPPORT_UTF
 145 if (utf)
 146   {
 147   BACKCHAR(ptr);
 148   GETCHAR(c, ptr);
 149   }
 150 else
 151 #endif  /* SUPPORT_UTF */
 152   c = *ptr;
 153
 154 if (type == NLTYPE_ANYCRLF) switch(c)
 155   {
 156   case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
 157                return TRUE;                         /* LF */
 158   case 0x000d: *lenptr = 1; return TRUE;            /* CR */
 159   default: return FALSE;
 160   }
 161
 162 else switch(c)
 163   {
 164   case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
 165                return TRUE;                         /* LF */
 166   case 0x000b:                                      /* VT */
 167   case 0x000c:                                      /* FF */
 168   case 0x000d: *lenptr = 1; return TRUE;            /* CR */
 169 #ifdef COMPILE_PCRE8
 170   case 0x0085: *lenptr = utf? 2 : 1; return TRUE;   /* NEL */
 171   case 0x2028:                                      /* LS */
 172   case 0x2029: *lenptr = 3; return TRUE;            /* PS */
 173 #else
 174   case 0x0085:                                       /* NEL */
 175   case 0x2028:                                       /* LS */
 176   case 0x2029: *lenptr = 1; return TRUE;             /* PS */
 177 #endif /* COMPILE_PCRE8 */
 178   default: return FALSE;
 179   }
 180 }
 181
 182 /* End of pcre_newline.c */