37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
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/* $OpenBSD: ohash_interval.c,v 1.3 2006/01/16 15:52:25 espie Exp $ */
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/* ex:ts=8 sw=4:
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*/
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/* Copyright (c) 1999, 2004 Marc Espie <espie@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "ohash_int.h"
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uint32_t
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ohash_interval(const char *s, const char **e)
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{
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uint32_t k;
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if (!*e)
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*e = s + strlen(s);
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if (s == *e)
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k = 0;
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else
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k = *s++;
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while (s != *e)
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k = ((k << 2) | (k >> 30)) ^ *s++;
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return k;
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}
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