update gettext copy.

[apps/madmutt.git] / intl / hash-string.c

diff --git a/intl/hash-string.c b/intl/hash-string.c
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+/* Implements a string hashing function.
+   Copyright (C) 1995, 1997, 1998, 2000, 2003 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* Specification.  */
+#include "hash-string.h"
+
+
+/* Defines the so called `hashpjw' function by P.J. Weinberger
+   [see Aho/Sethi/Ullman, COMPILERS: Principles, Techniques and Tools,
+   1986, 1987 Bell Telephone Laboratories, Inc.]  */
+unsigned long int
+__hash_string (const char *str_param)
+{
+  unsigned long int hval, g;
+  const char *str = str_param;
+
+  /* Compute the hash value for the given string.  */
+  hval = 0;
+  while (*str != '\0')
+    {
+      hval <<= 4;
+      hval += (unsigned char) *str++;
+      g = hval & ((unsigned long int) 0xf << (HASHWORDBITS - 4));
+      if (g != 0)
+       {
+         hval ^= g >> (HASHWORDBITS - 8);
+         hval ^= g;
+       }
+    }
+  return hval;
+}