Source to kern/kern_subr.c
/*
* Copyright (c) 1982, 1986, 1991 Regents of the University of California.
* All rights reserved.
*
* 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 7.7 (Berkeley) 4/15/91
*/
static char rcsid[] = "$Header: /usr/bill/working/sys/kern/RCS/kern_subr.c,v 1.3 92/01/21 21:29:28 william Exp $";
#include "param.h"
#include "systm.h"
#include "proc.h"
uiomove(cp, n, uio)
register caddr_t cp;
register int n;
register struct uio *uio;
{
register struct iovec *iov;
u_int cnt;
int error = 0;
#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;
}
iov->iov_base += cnt;
iov->iov_len -= cnt;
uio->uio_resid -= cnt;
uio->uio_offset += cnt;
cp += cnt;
n -= cnt;
}
return (error);
}
uioapply(func, arg1, arg2, uio)
int (*func)() ;
register struct uio *uio;
{
register struct iovec *iov;
u_int cnt, cnt1;
int error = 0;
/*#ifdef DIAGNOSTIC*/
if (uio->uio_rw != UIO_READ && uio->uio_rw != UIO_WRITE)
panic("uioapply: mode");
if (uio->uio_segflg == UIO_USERSPACE && uio->uio_procp != curproc)
panic("uioapply proc");
/*#endif*/
while (uio->uio_resid) {
iov = uio->uio_iov;
cnt = iov->iov_len;
if (cnt == 0) {
uio->uio_iov++;
uio->uio_iovcnt--;
continue;
}
cnt1 = cnt;
error = (*func)(arg1, arg2, uio->uio_offset, uio->uio_rw,
iov->iov_base, &cnt1, uio->uio_procp);
cnt -= cnt1;
iov->iov_base += cnt;
iov->iov_len -= cnt;
uio->uio_resid -= cnt;
uio->uio_offset += cnt;
if (error || cnt1)
return (error);
}
return (0);
}
/*
* Give next character to user as result of read.
*/
ureadc(c, uio)
register int c;
register struct uio *uio;
{
register struct iovec *iov;
again:
if (uio->uio_iovcnt == 0)
panic("ureadc");
iov = uio->uio_iov;
if (iov->iov_len <= 0 || uio->uio_resid <= 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;
}
iov->iov_base++;
iov->iov_len--;
uio->uio_resid--;
uio->uio_offset++;
return (0);
}
strcat(src, append)
register char *src, *append;
{
for (; *src; ++src)
;
while (*src++ = *append++)
;
}
strcpy(to, from)
register char *to, *from;
{
for (; *to = *from; ++from, ++to)
;
}
strncpy(to, from, cnt)
register char *to, *from;
register int cnt;
{
for (; cnt && (*to = *from); --cnt, ++from, ++to)
;
*to = '\0';
}
#ifndef lint /* unused except by ct.c, other oddities XXX */
/*
* Get next character written in by user from uio.
*/
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 /* notdef */