Regex: Add PCRE 8.32 in tools directory.

tools/pcre/pcre32_valid_utf32.c

@@ -0,0 +1,131 @@
+/*************************************************
+*      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) 1997-2012 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-32 character
+strings. */
+
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+/* Generate code with 32 bit character support. */
+#define COMPILE_PCRE32
+
+#include "pcre_internal.h"
+
+/*************************************************
+*         Validate a UTF-32 string                *
+*************************************************/
+
+/* This function is called (optionally) at the start of compile or match, to
+check that a supposed UTF-32 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.
+
+More information about the details of the error are passed
+back in the returned value:
+
+PCRE_UTF32_ERR0  No error
+PCRE_UTF32_ERR1  Surrogate character
+PCRE_UTF32_ERR2  Non-character
+PCRE_UTF32_ERR3  Character > 0x10ffff
+
+Arguments:
+  string       points to the string
+  length       length of string, or -1 if the string is zero-terminated
+  errp         pointer to an error position offset variable
+
+Returns:       = 0    if the string is a valid UTF-32 string
+               > 0    otherwise, setting the offset of the bad character
+*/
+
+int
+PRIV(valid_utf)(PCRE_PUCHAR string, int length, int *erroroffset)
+{
+#ifdef SUPPORT_UTF
+register PCRE_PUCHAR p;
+register pcre_uchar c;
+
+if (length < 0)
+  {
+  for (p = string; *p != 0; p++);
+  length = p - string;
+  }
+
+for (p = string; length-- > 0; p++)
+  {
+  c = *p;
+
+  if ((c & 0xfffff800u) != 0xd800u)
+    {
+    /* Normal UTF-32 code point. Neither high nor low surrogate. */
+
+    /* Check for non-characters */
+    if ((c & 0xfffeu) == 0xfffeu || (c >= 0xfdd0u && c <= 0xfdefu))
+      {
+      *erroroffset = p - string;
+      return PCRE_UTF32_ERR2;
+      }
+    else if (c > 0x10ffffu)
+      {
+      *erroroffset = p - string;
+      return PCRE_UTF32_ERR3;
+      }
+    }
+  else
+    {
+    /* A surrogate */
+    *erroroffset = p - string;
+    return PCRE_UTF32_ERR1;
+    }
+  }
+
+#else  /* SUPPORT_UTF */
+(void)(string);  /* Keep picky compilers happy */
+(void)(length);
+(void)(erroroffset);
+#endif /* SUPPORT_UTF */
+
+return PCRE_UTF32_ERR0;   /* This indicates success */
+}
+
+/* End of pcre32_valid_utf32.c */