Load pcre-6.0 into code/trunk.

git-svn-id: svn://vcs.exim.org/pcre/code/trunk@77 2f5784b3-3f2a-0410-8824-cb99058d5e15

1 files changed, 130 insertions, 0 deletions

diff --git a/pcre_valid_utf8.c b/pcre_valid_utf8.c
new file mode 100644
index 0000000..72f0f5e
--- /dev/null
+++ b/pcre_valid_utf8.c
@@ -0,0 +1,130 @@
+/*************************************************
+*      Perl-Compatible Regular Expressions       *
+*************************************************/
+
+/* PCRE is a library of functions to support regular expressions whose syntax
+and semantics are as close as possible to those of the Perl 5 language.
+
+                       Written by Philip Hazel
+           Copyright (c) 1997-2005 University of Cambridge
+
+-----------------------------------------------------------------------------
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+    * Neither the name of the University of Cambridge nor the names of its
+      contributors may be used to endorse or promote products derived from
+      this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+-----------------------------------------------------------------------------
+*/
+
+
+/* This module contains an internal function for validating UTF-8 character
+strings. */
+
+
+#include "pcre_internal.h"
+
+
+/*************************************************
+*         Validate a UTF-8 string                *
+*************************************************/
+
+/* This function is called (optionally) at the start of compile or match, to
+validate that a supposed UTF-8 string is actually valid. The early check means
+that subsequent code can assume it is dealing with a valid string. The check
+can be turned off for maximum performance, but the consequences of supplying
+an invalid string are then undefined.
+
+Arguments:
+  string       points to the string
+  length       length of string, or -1 if the string is zero-terminated
+
+Returns:       < 0    if the string is a valid UTF-8 string
+               >= 0   otherwise; the value is the offset of the bad byte
+*/
+
+EXPORT int
+_pcre_valid_utf8(const uschar *string, int length)
+{
+register const uschar *p;
+
+if (length < 0)
+  {
+  for (p = string; *p != 0; p++);
+  length = p - string;
+  }
+
+for (p = string; length-- > 0; p++)
+  {
+  register int ab;
+  register int c = *p;
+  if (c < 128) continue;
+  if ((c & 0xc0) != 0xc0) return p - string;
+  ab = _pcre_utf8_table4[c & 0x3f];  /* Number of additional bytes */
+  if (length < ab) return p - string;
+  length -= ab;
+
+  /* Check top bits in the second byte */
+  if ((*(++p) & 0xc0) != 0x80) return p - string;
+
+  /* Check for overlong sequences for each different length */
+  switch (ab)
+    {
+    /* Check for xx00 000x */
+    case 1:
+    if ((c & 0x3e) == 0) return p - string;
+    continue;   /* We know there aren't any more bytes to check */
+
+    /* Check for 1110 0000, xx0x xxxx */
+    case 2:
+    if (c == 0xe0 && (*p & 0x20) == 0) return p - string;
+    break;
+
+    /* Check for 1111 0000, xx00 xxxx */
+    case 3:
+    if (c == 0xf0 && (*p & 0x30) == 0) return p - string;
+    break;
+
+    /* Check for 1111 1000, xx00 0xxx */
+    case 4:
+    if (c == 0xf8 && (*p & 0x38) == 0) return p - string;
+    break;
+
+    /* Check for leading 0xfe or 0xff, and then for 1111 1100, xx00 00xx */
+    case 5:
+    if (c == 0xfe || c == 0xff ||
+       (c == 0xfc && (*p & 0x3c) == 0)) return p - string;
+    break;
+    }
+
+  /* Check for valid bytes after the 2nd, if any; all must start 10 */
+  while (--ab > 0)
+    {
+    if ((*(++p) & 0xc0) != 0x80) return p - string;
+    }
+  }
+
+return -1;
+}
+
+/* End of pcre_valid_utf8.c */