xref: /titanic_51/usr/src/lib/libast/common/hash/strkey.c (revision 96aa4f28c45f26c5cb5f5eb8bf23cb7fc6991d8f)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                  Common Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
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 Research
26  */
27 
28 #include <ast.h>
29 #include <hashkey.h>
30 
31 long
32 strkey(register const char* s)
33 {
34 	register long	x = 0;
35 	register int	n = 0;
36 	register int	c;
37 
38 	while (n++ < HASHKEYMAX)
39 	{
40 		c = *s;
41 		if (c >= 'a' && c <= 'z')
42 			x = HASHKEYPART(x, c);
43 		else if (c >= '0' && c <= '9')
44 			x = HASHKEYPART(x, HASHKEYN(c));
45 		else break;
46 		s++;
47 	}
48 	return x;
49 }
50