253 lines
6.2 KiB
C
253 lines
6.2 KiB
C
/*
|
|
* Copyright (c) 1982, 1986, 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* (c) UNIX System Laboratories, Inc.
|
|
* All or some portions of this file are derived from material licensed
|
|
* to the University of California by American Telephone and Telegraph
|
|
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
|
|
* the permission of UNIX System Laboratories, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
|
|
* $Id: kern_subr.c,v 1.10 1997/02/22 09:39:11 peter Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/queue.h>
|
|
|
|
int
|
|
uiomove(cp, n, uio)
|
|
register caddr_t cp;
|
|
register int n;
|
|
register struct uio *uio;
|
|
{
|
|
register struct iovec *iov;
|
|
u_int cnt;
|
|
int error;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE)
|
|
panic("uiomove: mode");
|
|
if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
|
|
panic("uiomove proc");
|
|
#endif
|
|
while (n > 0 && uio->uio_resid) {
|
|
iov = uio->uio_iov;
|
|
cnt = iov->iov_len;
|
|
if (cnt == 0) {
|
|
uio->uio_iov++;
|
|
uio->uio_iovcnt--;
|
|
continue;
|
|
}
|
|
if (cnt > n)
|
|
cnt = n;
|
|
|
|
switch (uio->uio_segflg) {
|
|
|
|
case UIO_USERSPACE:
|
|
case UIO_USERISPACE:
|
|
if (uio->uio_rw == UIO_READ)
|
|
error = copyout(cp, iov->iov_base, cnt);
|
|
else
|
|
error = copyin(iov->iov_base, cp, cnt);
|
|
if (error)
|
|
return (error);
|
|
break;
|
|
|
|
case UIO_SYSSPACE:
|
|
if (uio->uio_rw == UIO_READ)
|
|
bcopy((caddr_t)cp, iov->iov_base, cnt);
|
|
else
|
|
bcopy(iov->iov_base, (caddr_t)cp, cnt);
|
|
break;
|
|
case UIO_NOCOPY:
|
|
break;
|
|
}
|
|
iov->iov_base += cnt;
|
|
iov->iov_len -= cnt;
|
|
uio->uio_resid -= cnt;
|
|
uio->uio_offset += cnt;
|
|
cp += cnt;
|
|
n -= cnt;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Give next character to user as result of read.
|
|
*/
|
|
int
|
|
ureadc(c, uio)
|
|
register int c;
|
|
register struct uio *uio;
|
|
{
|
|
register struct iovec *iov;
|
|
|
|
again:
|
|
if (uio->uio_iovcnt == 0 || uio->uio_resid == 0)
|
|
panic("ureadc");
|
|
iov = uio->uio_iov;
|
|
if (iov->iov_len == 0) {
|
|
uio->uio_iovcnt--;
|
|
uio->uio_iov++;
|
|
goto again;
|
|
}
|
|
switch (uio->uio_segflg) {
|
|
|
|
case UIO_USERSPACE:
|
|
if (subyte(iov->iov_base, c) < 0)
|
|
return (EFAULT);
|
|
break;
|
|
|
|
case UIO_SYSSPACE:
|
|
*iov->iov_base = c;
|
|
break;
|
|
|
|
case UIO_USERISPACE:
|
|
if (suibyte(iov->iov_base, c) < 0)
|
|
return (EFAULT);
|
|
break;
|
|
case UIO_NOCOPY:
|
|
break;
|
|
}
|
|
iov->iov_base++;
|
|
iov->iov_len--;
|
|
uio->uio_resid--;
|
|
uio->uio_offset++;
|
|
return (0);
|
|
}
|
|
|
|
#ifdef vax /* unused except by ct.c, other oddities XXX */
|
|
/*
|
|
* Get next character written in by user from uio.
|
|
*/
|
|
int
|
|
uwritec(uio)
|
|
struct uio *uio;
|
|
{
|
|
register struct iovec *iov;
|
|
register int c;
|
|
|
|
if (uio->uio_resid <= 0)
|
|
return (-1);
|
|
again:
|
|
if (uio->uio_iovcnt <= 0)
|
|
panic("uwritec");
|
|
iov = uio->uio_iov;
|
|
if (iov->iov_len == 0) {
|
|
uio->uio_iov++;
|
|
if (--uio->uio_iovcnt == 0)
|
|
return (-1);
|
|
goto again;
|
|
}
|
|
switch (uio->uio_segflg) {
|
|
|
|
case UIO_USERSPACE:
|
|
c = fubyte(iov->iov_base);
|
|
break;
|
|
|
|
case UIO_SYSSPACE:
|
|
c = *(u_char *) iov->iov_base;
|
|
break;
|
|
|
|
case UIO_USERISPACE:
|
|
c = fuibyte(iov->iov_base);
|
|
break;
|
|
}
|
|
if (c < 0)
|
|
return (-1);
|
|
iov->iov_base++;
|
|
iov->iov_len--;
|
|
uio->uio_resid--;
|
|
uio->uio_offset++;
|
|
return (c);
|
|
}
|
|
#endif /* vax */
|
|
|
|
/*
|
|
* General routine to allocate a hash table.
|
|
*/
|
|
void *
|
|
hashinit(elements, type, hashmask)
|
|
int elements, type;
|
|
u_long *hashmask;
|
|
{
|
|
long hashsize;
|
|
LIST_HEAD(generic, generic) *hashtbl;
|
|
int i;
|
|
|
|
if (elements <= 0)
|
|
panic("hashinit: bad elements");
|
|
for (hashsize = 1; hashsize <= elements; hashsize <<= 1)
|
|
continue;
|
|
hashsize >>= 1;
|
|
hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, M_WAITOK);
|
|
for (i = 0; i < hashsize; i++)
|
|
LIST_INIT(&hashtbl[i]);
|
|
*hashmask = hashsize - 1;
|
|
return (hashtbl);
|
|
}
|
|
|
|
static int primes[] = { 1, 13, 31, 61, 127, 251, 509, 761, 1021, 1531, 2039,
|
|
2557, 3067, 3583, 4093, 4603, 5119, 5623, 6143, 6653,
|
|
7159, 7673, 8191, 12281, 16381, 24571, 32749 };
|
|
#define NPRIMES (sizeof(primes) / sizeof(primes[0]))
|
|
|
|
/*
|
|
* General routine to allocate a prime number sized hash table.
|
|
*/
|
|
void *
|
|
phashinit(elements, type, nentries)
|
|
int elements, type;
|
|
u_long *nentries;
|
|
{
|
|
long hashsize;
|
|
LIST_HEAD(generic, generic) *hashtbl;
|
|
int i;
|
|
|
|
if (elements <= 0)
|
|
panic("phashinit: bad elements");
|
|
for (i = 1, hashsize = primes[1]; hashsize <= elements;) {
|
|
i++;
|
|
if (i == NPRIMES)
|
|
break;
|
|
hashsize = primes[i];
|
|
}
|
|
hashsize = primes[i - 1];
|
|
hashtbl = malloc((u_long)hashsize * sizeof(*hashtbl), type, M_WAITOK);
|
|
for (i = 0; i < hashsize; i++)
|
|
LIST_INIT(&hashtbl[i]);
|
|
*nentries = hashsize;
|
|
return (hashtbl);
|
|
}
|