1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                 Eclipse Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*          http://www.eclipse.org/org/documents/epl-v10.html           *
11*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23/*
24 * Glenn Fowler
25 * AT&T Bell Laboratories
26 *
27 * hash table library
28 */
29
30#include "hashlib.h"
31
32/*
33 * return a running 32 bit checksum of string s
34 *
35 * c is the return value from a previous
36 * memsum() or strsum() call, 0 on the first call
37 *
38 * the result is the same on all implementations
39 */
40
41unsigned long
42strsum(const char* as, register unsigned long c)
43{
44	register const unsigned char*	s = (const unsigned char*)as;
45	register int			n;
46
47	while (n = *s++) HASHPART(c, n);
48#if LONG_MAX > 2147483647
49	return(c & 0xffffffff);
50#else
51	return(c);
52#endif
53}
54