/[pcre]/code/tags/pcre-7.8/pcre_valid_utf8.c
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revision 77 by nigel, Sat Feb 24 21:40:45 2007 UTC revision 199 by ph10, Tue Jul 31 14:39:09 2007 UTC
# Line 6  Line 6 
6  and semantics are as close as possible to those of the Perl 5 language.  and semantics are as close as possible to those of the Perl 5 language.
7    
8                         Written by Philip Hazel                         Written by Philip Hazel
9             Copyright (c) 1997-2005 University of Cambridge             Copyright (c) 1997-2007 University of Cambridge
10    
11  -----------------------------------------------------------------------------  -----------------------------------------------------------------------------
12  Redistribution and use in source and binary forms, with or without  Redistribution and use in source and binary forms, with or without
# Line 42  POSSIBILITY OF SUCH DAMAGE. Line 42  POSSIBILITY OF SUCH DAMAGE.
42  strings. */  strings. */
43    
44    
45    #ifdef HAVE_CONFIG_H
46    #include <config.h>
47    #endif
48    
49  #include "pcre_internal.h"  #include "pcre_internal.h"
50    
51    
# Line 63  Returns: < 0 if the string is a Line 67  Returns: < 0 if the string is a
67                 >= 0   otherwise; the value is the offset of the bad byte                 >= 0   otherwise; the value is the offset of the bad byte
68  */  */
69    
70  EXPORT int  int
71  _pcre_valid_utf8(const uschar *string, int length)  _pcre_valid_utf8(const uschar *string, int length)
72  {  {
73    #ifdef SUPPORT_UTF8
74  register const uschar *p;  register const uschar *p;
75    
76  if (length < 0)  if (length < 0)
# Line 79  for (p = string; length-- > 0; p++) Line 84  for (p = string; length-- > 0; p++)
84    register int ab;    register int ab;
85    register int c = *p;    register int c = *p;
86    if (c < 128) continue;    if (c < 128) continue;
87    if ((c & 0xc0) != 0xc0) return p - string;    if (c < 0xc0) return p - string;
88    ab = _pcre_utf8_table4[c & 0x3f];  /* Number of additional bytes */    ab = _pcre_utf8_table4[c & 0x3f];  /* Number of additional bytes */
89    if (length < ab) return p - string;    if (length < ab) return p - string;
90    length -= ab;    length -= ab;
# Line 123  for (p = string; length-- > 0; p++) Line 128  for (p = string; length-- > 0; p++)
128      if ((*(++p) & 0xc0) != 0x80) return p - string;      if ((*(++p) & 0xc0) != 0x80) return p - string;
129      }      }
130    }    }
131    #endif
132    
133  return -1;  return -1;
134  }  }
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