1 /* $NetBSD: hash.c,v 1.2 1995/07/03 21:24:47 cgd Exp $ */
4 * Copyright (c) 1994, 1995 Jochen Pohl
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Jochen Pohl for
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * $NetBSD: hash.c,v 1.2 1995/07/03 21:24:47 cgd Exp $
34 * $DragonFly: src/usr.bin/xlint/lint2/hash.c,v 1.5 2004/07/07 12:13:26 asmodai Exp $
43 /* pointer to hash table, initialized in inithash() */
46 static int hash(const char *);
49 * Initialize hash table.
54 htab
= xcalloc(HSHSIZ2
, sizeof (hte_t
*));
58 * Compute hash value from a string.
67 for (us
= (const u_char
*)s
; *us
!= '\0'; us
++) {
68 v
= (v
<< sizeof (v
)) + *us
;
69 v
^= v
>> (sizeof (v
) * CHAR_BIT
- sizeof (v
));
75 * Look for a hash table entry. If no hash table entry for the
76 * given name exists and mknew is set, create a new one.
79 hsearch(const char *s
, int mknew
)
85 for (hte
= htab
[h
]; hte
!= NULL
; hte
= hte
->h_link
) {
86 if (strcmp(hte
->h_name
, s
) == 0)
90 if (hte
!= NULL
|| !mknew
)
93 /* create a new hte */
94 hte
= xalloc(sizeof (hte_t
));
95 hte
->h_name
= xstrdup(s
);
96 hte
->h_lsym
= &hte
->h_syms
;
97 hte
->h_lcall
= &hte
->h_calls
;
98 hte
->h_lusym
= &hte
->h_usyms
;
99 hte
->h_link
= htab
[h
];
106 * Call function f for each name in the hash table.
109 forall(void (*f
)(hte_t
*))
114 for (i
= 0; i
< HSHSIZ2
; i
++) {
115 for (hte
= htab
[i
]; hte
!= NULL
; hte
= hte
->h_link
)