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 #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 int 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 if (type == NLTYPE_ANYCRLF) switch(c)
  91   {
  92   case 0x000a: *lenptr = 1; return TRUE;             /* LF */
  93   case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
  94                return TRUE;                          /* CR */
  95   default: return FALSE;
  96   }
  97
  98 /* NLTYPE_ANY */
  99
 100 else switch(c)
 101   {
 102   case 0x000a:                                       /* LF */
 103   case 0x000b:                                       /* VT */
 104   case 0x000c: *lenptr = 1; return TRUE;             /* FF */
 105   case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
 106                return TRUE;                          /* CR */
 107 #ifdef COMPILE_PCRE8
 108   case 0x0085: *lenptr = utf? 2 : 1; return TRUE;    /* NEL */
 109   case 0x2028:                                       /* LS */
 110   case 0x2029: *lenptr = 3; return TRUE;             /* PS */
 111 #else
 112   case 0x0085:                                       /* NEL */
 113   case 0x2028:                                       /* LS */
 114   case 0x2029: *lenptr = 1; return TRUE;             /* PS */
 115 #endif /* COMPILE_PCRE8 */
 116   default: return FALSE;
 117   }
 118 }
 119
 120
 121
 122 /*************************************************
 123 *     Check for newline at previous position     *
 124 *************************************************/
 125
 126 /* It is guaranteed that the initial value of ptr is greater than the start of
 127 the string that is being processed.
 128
 129 Arguments:
 130   ptr          pointer to possible newline
 131   type         the newline type
 132   startptr     pointer to the start of the string
 133   lenptr       where to return the length
 134   utf          TRUE if in utf mode
 135
 136 Returns:       TRUE or FALSE
 137 */
 138
 139 BOOL
 140 PRIV(was_newline)(PCRE_PUCHAR ptr, int type, PCRE_PUCHAR startptr, int *lenptr,
 141   BOOL utf)
 142 {
 143 int c;
 144 (void)utf;
 145 ptr--;
 146 #ifdef SUPPORT_UTF
 147 if (utf)
 148   {
 149   BACKCHAR(ptr);
 150   GETCHAR(c, ptr);
 151   }
 152 else
 153 #endif  /* SUPPORT_UTF */
 154   c = *ptr;
 155
 156 if (type == NLTYPE_ANYCRLF) switch(c)
 157   {
 158   case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
 159                return TRUE;                         /* LF */
 160   case 0x000d: *lenptr = 1; return TRUE;            /* CR */
 161   default: return FALSE;
 162   }
 163
 164 else switch(c)
 165   {
 166   case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
 167                return TRUE;                         /* LF */
 168   case 0x000b:                                      /* VT */
 169   case 0x000c:                                      /* FF */
 170   case 0x000d: *lenptr = 1; return TRUE;            /* CR */
 171 #ifdef COMPILE_PCRE8
 172   case 0x0085: *lenptr = utf? 2 : 1; return TRUE;   /* NEL */
 173   case 0x2028:                                      /* LS */
 174   case 0x2029: *lenptr = 3; return TRUE;            /* PS */
 175 #else
 176   case 0x0085:                                       /* NEL */
 177   case 0x2028:                                       /* LS */
 178   case 0x2029: *lenptr = 1; return TRUE;             /* PS */
 179 #endif /* COMPILE_PCRE8 */
 180   default: return FALSE;
 181   }
 182 }
 183
 184 /* End of pcre_newline.c */