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405550bf78
2002-07-24 Ulrich Drepper <drepper@redhat.com> * locale/hashval.h: Make more self-containedby defining LONG_BITS. * locale/programs/simple-hash.c: Remove LONG_BITS definition. * locale/programs/locarchive.c (add_locale_to_archive): Correct test to detect duplicate locales. * libio/fileops.c (_IO_new_file_seekoff): Fail if relative position would be before beginning of file. (_IO_file_seekoff_mmap): Likewise. * libio/Makefile (tests): Add bug-fseek. * libio/bug-fseek.c: New file. * intl/explodename.c: Remove support for CEN-style locale variables. It was never used and shouldn't be since it's not portable. * intl/finddomain.c: Likewise. * intl/l10nflist.c: Likewise. * intl/loadinfo.h: Likewise. * locale/findlocale.c: Likewise.
48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
/* Implement simple hashing table with string based keys.
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Copyright (C) 1994-1997, 2000, 2001, 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, October 1994.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef LONGBITS
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# define LONGBITS (sizeof (long int) * BITSPERBYTE)
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#endif
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unsigned long int compute_hashval (const void *key, size_t keylen);
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unsigned long int
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compute_hashval (key, keylen)
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const void *key;
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size_t keylen;
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{
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size_t cnt;
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unsigned long int hval;
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/* Compute the hash value for the given string. The algorithm
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is taken from [Aho,Sethi,Ullman], modified to reduce the number of
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collisions for short strings with very varied bit patterns.
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See http://www.clisp.org/haible/hashfunc.html. */
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cnt = 0;
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hval = keylen;
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while (cnt < keylen)
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{
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hval = (hval << 9) | (hval >> (LONGBITS - 9));
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hval += (unsigned long int) *(((char *) key) + cnt++);
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}
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return hval != 0 ? hval : ~((unsigned long int) 0);
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}
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