src/src/pcre/pcre_newline.c

   1 /* $Cambridge: exim/src/src/pcre/pcre_newline.c,v 1.2 2007/06/26 11:16:54 ph10 Exp $ */
   2
   3 /*************************************************
   4 *      Perl-Compatible Regular Expressions       *
   5 *************************************************/
   6
   7 /* PCRE is a library of functions to support regular expressions whose syntax
   8 and semantics are as close as possible to those of the Perl 5 language.
   9
  10                        Written by Philip Hazel
  11            Copyright (c) 1997-2007 University of Cambridge
  12
  13 -----------------------------------------------------------------------------
  14 Redistribution and use in source and binary forms, with or without
  15 modification, are permitted provided that the following conditions are met:
  16
  17     * Redistributions of source code must retain the above copyright notice,
  18       this list of conditions and the following disclaimer.
  19
  20     * Redistributions in binary form must reproduce the above copyright
  21       notice, this list of conditions and the following disclaimer in the
  22       documentation and/or other materials provided with the distribution.
  23
  24     * Neither the name of the University of Cambridge nor the names of its
  25       contributors may be used to endorse or promote products derived from
  26       this software without specific prior written permission.
  27
  28 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  29 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  32 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  33 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  34 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  35 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  36 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  37 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38 POSSIBILITY OF SUCH DAMAGE.
  39 -----------------------------------------------------------------------------
  40 */
  41
  42
  43 /* This module contains internal functions for testing newlines when more than
  44 one kind of newline is to be recognized. When a newline is found, its length is
  45 returned. In principle, we could implement several newline "types", each
  46 referring to a different set of newline characters. At present, PCRE supports
  47 only NLTYPE_FIXED, which gets handled without these functions, NLTYPE_ANYCRLF,
  48 and NLTYPE_ANY. The full list of Unicode newline characters is taken from
  49 http://unicode.org/unicode/reports/tr18/. */
  50
  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   utf8         TRUE if in utf8 mode
  69
  70 Returns:       TRUE or FALSE
  71 */
  72
  73 BOOL
  74 _pcre_is_newline(const uschar *ptr, int type, const uschar *endptr,
  75   int *lenptr, BOOL utf8)
  76 {
  77 int c;
  78 if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
  79
  80 if (type == NLTYPE_ANYCRLF) switch(c)
  81   {
  82   case 0x000a: *lenptr = 1; return TRUE;             /* LF */
  83   case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
  84                return TRUE;                          /* CR */
  85   default: return FALSE;
  86   }
  87
  88 /* NLTYPE_ANY */
  89
  90 else switch(c)
  91   {
  92   case 0x000a:                                       /* LF */
  93   case 0x000b:                                       /* VT */
  94   case 0x000c: *lenptr = 1; return TRUE;             /* FF */
  95   case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
  96                return TRUE;                          /* CR */
  97   case 0x0085: *lenptr = utf8? 2 : 1; return TRUE;   /* NEL */
  98   case 0x2028:                                       /* LS */
  99   case 0x2029: *lenptr = 3; return TRUE;             /* PS */
 100   default: return FALSE;
 101   }
 102 }
 103
 104
 105
 106 /*************************************************
 107 *     Check for newline at previous position     *
 108 *************************************************/
 109
 110 /* It is guaranteed that the initial value of ptr is greater than the start of
 111 the string that is being processed.
 112
 113 Arguments:
 114   ptr          pointer to possible newline
 115   type         the newline type
 116   startptr     pointer to the start of the string
 117   lenptr       where to return the length
 118   utf8         TRUE if in utf8 mode
 119
 120 Returns:       TRUE or FALSE
 121 */
 122
 123 BOOL
 124 _pcre_was_newline(const uschar *ptr, int type, const uschar *startptr,
 125   int *lenptr, BOOL utf8)
 126 {
 127 int c;
 128 ptr--;
 129 if (utf8)
 130   {
 131   BACKCHAR(ptr);
 132   GETCHAR(c, ptr);
 133   }
 134 else c = *ptr;
 135
 136 if (type == NLTYPE_ANYCRLF) switch(c)
 137   {
 138   case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
 139                return TRUE;                         /* LF */
 140   case 0x000d: *lenptr = 1; return TRUE;            /* CR */
 141   default: return FALSE;
 142   }
 143
 144 else switch(c)
 145   {
 146   case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
 147                return TRUE;                         /* LF */
 148   case 0x000b:                                      /* VT */
 149   case 0x000c:                                      /* FF */
 150   case 0x000d: *lenptr = 1; return TRUE;            /* CR */
 151   case 0x0085: *lenptr = utf8? 2 : 1; return TRUE;  /* NEL */
 152   case 0x2028:                                      /* LS */
 153   case 0x2029: *lenptr = 3; return TRUE;            /* PS */
 154   default: return FALSE;
 155   }
 156 }
 157
 158 /* End of pcre_newline.c */