Annotation of embedaddon/pcre/pcre_newline.c, revision 1.1
1.1 ! misho 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) 1997-2009 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: utf8 TRUE if in utf8 mode
! 71:
! 72: Returns: TRUE or FALSE
! 73: */
! 74:
! 75: BOOL
! 76: _pcre_is_newline(USPTR ptr, int type, USPTR endptr, int *lenptr, BOOL utf8)
! 77: {
! 78: int c;
! 79: if (utf8) { GETCHAR(c, ptr); } else c = *ptr;
! 80:
! 81: if (type == NLTYPE_ANYCRLF) switch(c)
! 82: {
! 83: case 0x000a: *lenptr = 1; return TRUE; /* LF */
! 84: case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
! 85: return TRUE; /* CR */
! 86: default: return FALSE;
! 87: }
! 88:
! 89: /* NLTYPE_ANY */
! 90:
! 91: else switch(c)
! 92: {
! 93: case 0x000a: /* LF */
! 94: case 0x000b: /* VT */
! 95: case 0x000c: *lenptr = 1; return TRUE; /* FF */
! 96: case 0x000d: *lenptr = (ptr < endptr - 1 && ptr[1] == 0x0a)? 2 : 1;
! 97: return TRUE; /* CR */
! 98: case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
! 99: case 0x2028: /* LS */
! 100: case 0x2029: *lenptr = 3; return TRUE; /* PS */
! 101: default: return FALSE;
! 102: }
! 103: }
! 104:
! 105:
! 106:
! 107: /*************************************************
! 108: * Check for newline at previous position *
! 109: *************************************************/
! 110:
! 111: /* It is guaranteed that the initial value of ptr is greater than the start of
! 112: the string that is being processed.
! 113:
! 114: Arguments:
! 115: ptr pointer to possible newline
! 116: type the newline type
! 117: startptr pointer to the start of the string
! 118: lenptr where to return the length
! 119: utf8 TRUE if in utf8 mode
! 120:
! 121: Returns: TRUE or FALSE
! 122: */
! 123:
! 124: BOOL
! 125: _pcre_was_newline(USPTR ptr, int type, USPTR startptr, int *lenptr, BOOL utf8)
! 126: {
! 127: int c;
! 128: ptr--;
! 129: #ifdef SUPPORT_UTF8
! 130: if (utf8)
! 131: {
! 132: BACKCHAR(ptr);
! 133: GETCHAR(c, ptr);
! 134: }
! 135: else c = *ptr;
! 136: #else /* no UTF-8 support */
! 137: c = *ptr;
! 138: #endif /* SUPPORT_UTF8 */
! 139:
! 140: if (type == NLTYPE_ANYCRLF) switch(c)
! 141: {
! 142: case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
! 143: return TRUE; /* LF */
! 144: case 0x000d: *lenptr = 1; return TRUE; /* CR */
! 145: default: return FALSE;
! 146: }
! 147:
! 148: else switch(c)
! 149: {
! 150: case 0x000a: *lenptr = (ptr > startptr && ptr[-1] == 0x0d)? 2 : 1;
! 151: return TRUE; /* LF */
! 152: case 0x000b: /* VT */
! 153: case 0x000c: /* FF */
! 154: case 0x000d: *lenptr = 1; return TRUE; /* CR */
! 155: case 0x0085: *lenptr = utf8? 2 : 1; return TRUE; /* NEL */
! 156: case 0x2028: /* LS */
! 157: case 0x2029: *lenptr = 3; return TRUE; /* PS */
! 158: default: return FALSE;
! 159: }
! 160: }
! 161:
! 162: /* End of pcre_newline.c */
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