FreeBSD/Linux Kernel Cross Reference
sys/sys/clist.h
1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)clist.h 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/sys/sys/clist.h,v 1.14 2008/09/21 18:12:18 ed Exp $
31 */
32
33 #ifndef _SYS_CLIST_H_
34 #define _SYS_CLIST_H_
35
36 #include <sys/param.h>
37
38 /*
39 * Clists are character lists, which is a variable length linked list
40 * of cblocks, with a count of the number of characters in the list.
41 */
42 struct clist {
43 int c_cc; /* Number of characters in the clist. */
44 int c_cbcount; /* Number of cblocks. */
45 int c_cbmax; /* Max # cblocks allowed for this clist. */
46 int c_cbreserved; /* # cblocks reserved for this clist. */
47 char *c_cf; /* Pointer to the first cblock. */
48 char *c_cl; /* Pointer to the last cblock. */
49 };
50
51 struct cblock {
52 struct cblock *c_next; /* next cblock in queue */
53 unsigned char c_info[CBSIZE]; /* characters */
54 };
55
56 #ifdef _KERNEL
57 extern int cfreecount;
58
59 int b_to_q(char *cp, int cc, struct clist *q);
60 void clist_alloc_cblocks(struct clist *q, int ccmax, int ccres);
61 void clist_free_cblocks(struct clist *q);
62 int getc(struct clist *q);
63 void ndflush(struct clist *q, int cc);
64 int putc(char c, struct clist *q);
65 int q_to_b(struct clist *q, char *cp, int cc);
66 int unputc(struct clist *q);
67 #endif
68
69 #endif
70
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