NetBSD-5.0.2/usr.sbin/puffs/mount_9p/ninebuf.c
/* $NetBSD: ninebuf.c,v 1.7 2007/09/06 16:09:09 pooka Exp $ */
/*
* Copyright (c) 2006, 2007 Antti Kantee. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: ninebuf.c,v 1.7 2007/09/06 16:09:09 pooka Exp $");
#endif /* !lint */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/vnode.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <util.h>
#include <unistd.h>
#include "ninepuffs.h"
#define CHECK(v) if (!(v)) abort()
uint8_t
p9pbuf_get_type(struct puffs_framebuf *pb)
{
uint8_t val;
puffs_framebuf_getdata_atoff(pb, 4, &val, 1);
return val;
}
uint16_t
p9pbuf_get_tag(struct puffs_framebuf *pb)
{
uint16_t val;
puffs_framebuf_getdata_atoff(pb, 5, &val, 2);
return le16toh(val);
}
static uint32_t
p9pbuf_get_len(struct puffs_framebuf *pb)
{
uint32_t val;
puffs_framebuf_getdata_atoff(pb, 0, &val, 4);
return le32toh(val);
}
#define CUROFF(pb) (puffs_framebuf_telloff(pb))
int
p9pbuf_read(struct puffs_usermount *pu, struct puffs_framebuf *pb,
int fd, int *done)
{
void *win;
ssize_t n;
size_t howmuch, winlen;
int lenstate;
the_next_level:
if ((lenstate = (CUROFF(pb) < 4)))
howmuch = 4 - CUROFF(pb);
else
howmuch = p9pbuf_get_len(pb) - CUROFF(pb);
if (puffs_framebuf_reserve_space(pb, howmuch) == -1)
return errno;
while (howmuch) {
winlen = howmuch;
if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
return errno;
n = read(fd, win, winlen);
switch (n) {
case 0:
return ECONNRESET;
case -1:
if (errno == EAGAIN)
return 0;
return errno;
default:
howmuch -= n;
puffs_framebuf_seekset(pb, CUROFF(pb) + n);
break;
}
}
if (!lenstate) {
puffs_framebuf_seekset(pb, 7);
*done = 1;
return 0;
} else
goto the_next_level;
}
int
p9pbuf_write(struct puffs_usermount *pu, struct puffs_framebuf *pb,
int fd, int *done)
{
void *win;
ssize_t n;
size_t winlen, howmuch;
if (CUROFF(pb) == 0) {
uint32_t len;
len = htole32(puffs_framebuf_tellsize(pb));
puffs_framebuf_putdata_atoff(pb, 0, &len, 4);
}
howmuch = puffs_framebuf_tellsize(pb) - CUROFF(pb);
while (howmuch) {
winlen = howmuch;
if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
return errno;
n = send(fd, win, winlen, MSG_NOSIGNAL);
switch (n) {
case 0:
return ECONNRESET;
case -1:
if (errno == EAGAIN)
return 0;
return errno;
default:
howmuch -= n;
puffs_framebuf_seekset(pb, CUROFF(pb) + n);
break;
}
}
*done = 1;
return 0;
}
#undef CUROFF
int
p9pbuf_cmp(struct puffs_usermount *pu,
struct puffs_framebuf *c1, struct puffs_framebuf *c2, int *notresp)
{
return p9pbuf_get_tag(c1) != p9pbuf_get_tag(c2);
}
struct puffs_framebuf *
p9pbuf_makeout()
{
struct puffs_framebuf *pb;
pb = puffs_framebuf_make();
puffs_framebuf_seekset(pb, 4);
return pb;
}
void
p9pbuf_recycleout(struct puffs_framebuf *pb)
{
puffs_framebuf_recycle(pb);
puffs_framebuf_seekset(pb, 4);
}
void
p9pbuf_put_1(struct puffs_framebuf *pb, uint8_t val)
{
int rv;
rv = puffs_framebuf_putdata(pb, &val, 1);
CHECK(rv == 0);
}
void
p9pbuf_put_2(struct puffs_framebuf *pb, uint16_t val)
{
int rv;
HTOLE16(val);
rv = puffs_framebuf_putdata(pb, &val, 2);
CHECK(rv == 0);
}
void
p9pbuf_put_4(struct puffs_framebuf *pb, uint32_t val)
{
int rv;
HTOLE32(val);
rv = puffs_framebuf_putdata(pb, &val, 4);
CHECK(rv == 0);
}
void
p9pbuf_put_8(struct puffs_framebuf *pb, uint64_t val)
{
int rv;
HTOLE64(val);
rv = puffs_framebuf_putdata(pb, &val, 8);
CHECK(rv == 0);
}
void
p9pbuf_put_data(struct puffs_framebuf *pb, const void *data, uint16_t dlen)
{
int rv;
p9pbuf_put_2(pb, dlen);
rv = puffs_framebuf_putdata(pb, data, dlen);
CHECK(rv == 0);
}
void
p9pbuf_put_str(struct puffs_framebuf *pb, const char *str)
{
p9pbuf_put_data(pb, str, strlen(str));
}
void
p9pbuf_write_data(struct puffs_framebuf *pb, uint8_t *data, uint32_t dlen)
{
int rv;
rv = puffs_framebuf_putdata(pb, data, dlen);
CHECK(rv == 0);
}
#define ERETURN(rv) return ((rv) == -1 ? errno : 0)
int
p9pbuf_get_1(struct puffs_framebuf *pb, uint8_t *val)
{
ERETURN(puffs_framebuf_getdata(pb, val, 1));
}
int
p9pbuf_get_2(struct puffs_framebuf *pb, uint16_t *val)
{
int rv;
rv = puffs_framebuf_getdata(pb, val, 2);
LE16TOH(*val);
ERETURN(rv);
}
int
p9pbuf_get_4(struct puffs_framebuf *pb, uint32_t *val)
{
int rv;
rv = puffs_framebuf_getdata(pb, val, 4);
LE32TOH(*val);
ERETURN(rv);
}
int
p9pbuf_get_8(struct puffs_framebuf *pb, uint64_t *val)
{
int rv;
rv = puffs_framebuf_getdata(pb, val, 8);
LE64TOH(*val);
ERETURN(rv);
}
int
p9pbuf_get_data(struct puffs_framebuf *pb, uint8_t **dp, uint16_t *dlenp)
{
uint8_t *data;
uint16_t len;
int rv;
rv = p9pbuf_get_2(pb, &len);
if (rv)
return errno;
if (puffs_framebuf_remaining(pb) < len)
return EPROTO;
if (dp) {
data = emalloc(len+1);
rv = puffs_framebuf_getdata(pb, data, len);
if (rv) {
free(data);
return errno;
}
data[len] = '\0';
*dp = data;
} else
puffs_framebuf_seekset(pb, puffs_framebuf_telloff(pb)+len);
if (dlenp)
*dlenp = len;
return 0;
}
int
p9pbuf_read_data(struct puffs_framebuf *pb, uint8_t *buf, uint32_t dlen)
{
ERETURN(puffs_framebuf_getdata(pb, buf, dlen));
}
int
p9pbuf_get_str(struct puffs_framebuf *pb, char **dp, uint16_t *dlenp)
{
return p9pbuf_get_data(pb, (uint8_t **)dp, dlenp);
}