338 lines
6.5 KiB
C
338 lines
6.5 KiB
C
/* $NetBSD: ninebuf.c,v 1.7 2007/09/06 16:09:09 pooka Exp $ */
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/*
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* Copyright (c) 2006, 2007 Antti Kantee. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: ninebuf.c,v 1.7 2007/09/06 16:09:09 pooka Exp $");
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#endif /* !lint */
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/vnode.h>
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#include <err.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <util.h>
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#include <unistd.h>
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#include "ninepuffs.h"
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#define CHECK(v) if (!(v)) abort()
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uint8_t
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p9pbuf_get_type(struct puffs_framebuf *pb)
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{
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uint8_t val;
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puffs_framebuf_getdata_atoff(pb, 4, &val, 1);
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return val;
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}
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uint16_t
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p9pbuf_get_tag(struct puffs_framebuf *pb)
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{
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uint16_t val;
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puffs_framebuf_getdata_atoff(pb, 5, &val, 2);
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return le16toh(val);
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}
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static uint32_t
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p9pbuf_get_len(struct puffs_framebuf *pb)
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{
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uint32_t val;
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puffs_framebuf_getdata_atoff(pb, 0, &val, 4);
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return le32toh(val);
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}
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#define CUROFF(pb) (puffs_framebuf_telloff(pb))
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int
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p9pbuf_read(struct puffs_usermount *pu, struct puffs_framebuf *pb,
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int fd, int *done)
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{
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void *win;
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ssize_t n;
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size_t howmuch, winlen;
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int lenstate;
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the_next_level:
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if ((lenstate = (CUROFF(pb) < 4)))
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howmuch = 4 - CUROFF(pb);
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else
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howmuch = p9pbuf_get_len(pb) - CUROFF(pb);
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if (puffs_framebuf_reserve_space(pb, howmuch) == -1)
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return errno;
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while (howmuch) {
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winlen = howmuch;
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if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
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return errno;
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n = read(fd, win, winlen);
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switch (n) {
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case 0:
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return ECONNRESET;
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case -1:
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if (errno == EAGAIN)
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return 0;
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return errno;
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default:
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howmuch -= n;
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puffs_framebuf_seekset(pb, CUROFF(pb) + n);
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break;
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}
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}
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if (!lenstate) {
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puffs_framebuf_seekset(pb, 7);
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*done = 1;
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return 0;
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} else
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goto the_next_level;
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}
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int
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p9pbuf_write(struct puffs_usermount *pu, struct puffs_framebuf *pb,
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int fd, int *done)
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{
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void *win;
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ssize_t n;
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size_t winlen, howmuch;
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if (CUROFF(pb) == 0) {
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uint32_t len;
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len = htole32(puffs_framebuf_tellsize(pb));
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puffs_framebuf_putdata_atoff(pb, 0, &len, 4);
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}
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howmuch = puffs_framebuf_tellsize(pb) - CUROFF(pb);
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while (howmuch) {
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winlen = howmuch;
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if (puffs_framebuf_getwindow(pb, CUROFF(pb), &win, &winlen)==-1)
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return errno;
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n = send(fd, win, winlen, MSG_NOSIGNAL);
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switch (n) {
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case 0:
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return ECONNRESET;
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case -1:
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if (errno == EAGAIN)
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return 0;
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return errno;
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default:
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howmuch -= n;
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puffs_framebuf_seekset(pb, CUROFF(pb) + n);
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break;
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}
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}
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*done = 1;
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return 0;
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}
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#undef CUROFF
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int
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p9pbuf_cmp(struct puffs_usermount *pu,
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struct puffs_framebuf *c1, struct puffs_framebuf *c2, int *notresp)
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{
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return p9pbuf_get_tag(c1) != p9pbuf_get_tag(c2);
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}
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struct puffs_framebuf *
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p9pbuf_makeout()
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{
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struct puffs_framebuf *pb;
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pb = puffs_framebuf_make();
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puffs_framebuf_seekset(pb, 4);
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return pb;
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}
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void
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p9pbuf_recycleout(struct puffs_framebuf *pb)
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{
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puffs_framebuf_recycle(pb);
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puffs_framebuf_seekset(pb, 4);
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}
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void
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p9pbuf_put_1(struct puffs_framebuf *pb, uint8_t val)
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{
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int rv;
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rv = puffs_framebuf_putdata(pb, &val, 1);
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CHECK(rv == 0);
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}
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void
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p9pbuf_put_2(struct puffs_framebuf *pb, uint16_t val)
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{
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int rv;
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HTOLE16(val);
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rv = puffs_framebuf_putdata(pb, &val, 2);
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CHECK(rv == 0);
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}
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void
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p9pbuf_put_4(struct puffs_framebuf *pb, uint32_t val)
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{
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int rv;
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HTOLE32(val);
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rv = puffs_framebuf_putdata(pb, &val, 4);
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CHECK(rv == 0);
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}
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void
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p9pbuf_put_8(struct puffs_framebuf *pb, uint64_t val)
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{
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int rv;
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HTOLE64(val);
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rv = puffs_framebuf_putdata(pb, &val, 8);
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CHECK(rv == 0);
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}
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void
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p9pbuf_put_data(struct puffs_framebuf *pb, const void *data, uint16_t dlen)
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{
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int rv;
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p9pbuf_put_2(pb, dlen);
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rv = puffs_framebuf_putdata(pb, data, dlen);
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CHECK(rv == 0);
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}
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void
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p9pbuf_put_str(struct puffs_framebuf *pb, const char *str)
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{
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p9pbuf_put_data(pb, str, strlen(str));
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}
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void
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p9pbuf_write_data(struct puffs_framebuf *pb, uint8_t *data, uint32_t dlen)
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{
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int rv;
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rv = puffs_framebuf_putdata(pb, data, dlen);
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CHECK(rv == 0);
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}
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#define ERETURN(rv) return ((rv) == -1 ? errno : 0)
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int
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p9pbuf_get_1(struct puffs_framebuf *pb, uint8_t *val)
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{
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ERETURN(puffs_framebuf_getdata(pb, val, 1));
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}
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int
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p9pbuf_get_2(struct puffs_framebuf *pb, uint16_t *val)
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{
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int rv;
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rv = puffs_framebuf_getdata(pb, val, 2);
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LE16TOH(*val);
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ERETURN(rv);
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}
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int
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p9pbuf_get_4(struct puffs_framebuf *pb, uint32_t *val)
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{
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int rv;
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rv = puffs_framebuf_getdata(pb, val, 4);
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LE32TOH(*val);
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ERETURN(rv);
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}
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int
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p9pbuf_get_8(struct puffs_framebuf *pb, uint64_t *val)
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{
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int rv;
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rv = puffs_framebuf_getdata(pb, val, 8);
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LE64TOH(*val);
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ERETURN(rv);
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}
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int
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p9pbuf_get_data(struct puffs_framebuf *pb, uint8_t **dp, uint16_t *dlenp)
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{
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uint8_t *data;
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uint16_t len;
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int rv;
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rv = p9pbuf_get_2(pb, &len);
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if (rv)
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return errno;
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if (puffs_framebuf_remaining(pb) < len)
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return EPROTO;
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if (dp) {
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data = emalloc(len+1);
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rv = puffs_framebuf_getdata(pb, data, len);
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if (rv) {
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free(data);
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return errno;
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}
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data[len] = '\0';
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*dp = data;
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} else
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puffs_framebuf_seekset(pb, puffs_framebuf_telloff(pb)+len);
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if (dlenp)
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*dlenp = len;
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return 0;
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}
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int
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p9pbuf_read_data(struct puffs_framebuf *pb, uint8_t *buf, uint32_t dlen)
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{
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ERETURN(puffs_framebuf_getdata(pb, buf, dlen));
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}
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int
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p9pbuf_get_str(struct puffs_framebuf *pb, char **dp, uint16_t *dlenp)
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{
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return p9pbuf_get_data(pb, (uint8_t **)dp, dlenp);
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}
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