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/* Stream/packet buffer API implementation
* Copyright (c) 2014-2015 Timo Teräs
*
* This file is free software: you may copy, redistribute and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*/
#define _GNU_SOURCE
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include "zassert.h"
#include "zbuf.h"
#include "memory.h"
#include "memtypes.h"
#include "nhrpd.h"
#define ERRNO_IO_RETRY(EN) (((EN) == EAGAIN) || ((EN) == EWOULDBLOCK) || ((EN) == EINTR))
struct zbuf *zbuf_alloc(size_t size)
{
struct zbuf *zb;
zb = XMALLOC(MTYPE_STREAM_DATA, sizeof(*zb) + size);
if (!zb)
return NULL;
zbuf_init(zb, zb+1, size, 0);
zb->allocated = 1;
return zb;
}
void zbuf_init(struct zbuf *zb, void *buf, size_t len, size_t datalen)
{
*zb = (struct zbuf) {
.buf = buf,
.end = (uint8_t *)buf + len,
.head = buf,
.tail = (uint8_t *)buf + datalen,
};
}
void zbuf_free(struct zbuf *zb)
{
if (zb->allocated)
XFREE(MTYPE_STREAM_DATA, zb);
}
void zbuf_reset(struct zbuf *zb)
{
zb->head = zb->tail = zb->buf;
zb->error = 0;
}
void zbuf_reset_head(struct zbuf *zb, void *ptr)
{
zassert((void*)zb->buf <= ptr && ptr <= (void*)zb->tail);
zb->head = ptr;
}
static void zbuf_remove_headroom(struct zbuf *zb)
{
ssize_t headroom = zbuf_headroom(zb);
if (!headroom)
return;
memmove(zb->buf, zb->head, zbuf_used(zb));
zb->head -= headroom;
zb->tail -= headroom;
}
ssize_t zbuf_read(struct zbuf *zb, int fd, size_t maxlen)
{
ssize_t r;
if (zb->error)
return -3;
zbuf_remove_headroom(zb);
if (maxlen > zbuf_tailroom(zb))
maxlen = zbuf_tailroom(zb);
r = read(fd, zb->tail, maxlen);
if (r > 0) zb->tail += r;
else if (r == 0) r = -2;
else if (r < 0 && ERRNO_IO_RETRY(errno)) r = 0;
return r;
}
ssize_t zbuf_write(struct zbuf *zb, int fd)
{
ssize_t r;
if (zb->error)
return -3;
r = write(fd, zb->head, zbuf_used(zb));
if (r > 0) {
zb->head += r;
if (zb->head == zb->tail)
zbuf_reset(zb);
}
else if (r == 0) r = -2;
else if (r < 0 && ERRNO_IO_RETRY(errno)) r = 0;
return r;
}
ssize_t zbuf_recv(struct zbuf *zb, int fd)
{
ssize_t r;
if (zb->error)
return -3;
zbuf_remove_headroom(zb);
r = recv(fd, zb->tail, zbuf_tailroom(zb), 0);
if (r > 0) zb->tail += r;
else if (r == 0) r = -2;
else if (r < 0 && ERRNO_IO_RETRY(errno)) r = 0;
return r;
}
ssize_t zbuf_send(struct zbuf *zb, int fd)
{
ssize_t r;
if (zb->error)
return -3;
r = send(fd, zb->head, zbuf_used(zb), 0);
if (r >= 0)
zbuf_reset(zb);
return r;
}
void *zbuf_may_pull_until(struct zbuf *zb, const char *sep, struct zbuf *msg)
{
size_t seplen = strlen(sep), len;
uint8_t *ptr;
ptr = memmem(zb->head, zbuf_used(zb), sep, seplen);
if (!ptr) return NULL;
len = ptr - zb->head + seplen;
zbuf_init(msg, zbuf_pulln(zb, len), len, len);
return msg->head;
}
void zbufq_init(struct zbuf_queue *zbq)
{
*zbq = (struct zbuf_queue) {
.queue_head = LIST_INITIALIZER(zbq->queue_head),
};
}
void zbufq_reset(struct zbuf_queue *zbq)
{
struct zbuf *buf, *bufn;
list_for_each_entry_safe(buf, bufn, &zbq->queue_head, queue_list) {
list_del(&buf->queue_list);
zbuf_free(buf);
}
}
void zbufq_queue(struct zbuf_queue *zbq, struct zbuf *zb)
{
list_add_tail(&zb->queue_list, &zbq->queue_head);
}
int zbufq_write(struct zbuf_queue *zbq, int fd)
{
struct iovec iov[16];
struct zbuf *zb, *zbn;
ssize_t r;
size_t iovcnt = 0;
list_for_each_entry_safe(zb, zbn, &zbq->queue_head, queue_list) {
iov[iovcnt++] = (struct iovec) {
.iov_base = zb->head,
.iov_len = zbuf_used(zb),
};
if (iovcnt >= ZEBRA_NUM_OF(iov))
break;
}
r = writev(fd, iov, iovcnt);
if (r < 0)
return r;
list_for_each_entry_safe(zb, zbn, &zbq->queue_head, queue_list) {
if (r < (ssize_t)zbuf_used(zb)) {
zb->head += r;
return 1;
}
r -= zbuf_used(zb);
list_del(&zb->queue_list);
zbuf_free(zb);
}
return 0;
}
void zbuf_copy(struct zbuf *zdst, struct zbuf *zsrc, size_t len)
{
const void *src;
void *dst;
dst = zbuf_pushn(zdst, len);
src = zbuf_pulln(zsrc, len);
if (!dst || !src) return;
memcpy(dst, src, len);
}
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