void
test_copy (void) {
char str1[] = "\x01\x01x\x01\x01y\x01\x01xy\x01\x01";
char *str2 = (char *)NULL;
char *str3 = (char *)NULL;
cbuffer_t *buf1 = (cbuffer_t *)NULL;
cbuffer_t *buf2 = (cbuffer_t *)NULL;
buf1 = cbuf_new();
buf2 = cbuf_new();
cbuf_import (buf1, str1, strlen (str1));
cbuf_copy (buf2, buf1);
printf ("test_copy(): str1 = %s\n", str1);
str2 = (char *)xmalloc (buf1->sz + 1);
memset (str2, (int)NULL, buf1->sz + 1);
memcpy (str2, buf1->data, buf1->sz);
str3 = (char *)xmalloc (buf2->sz + 1);
memset (str3, (int)NULL, buf2->sz + 1);
memcpy (str3, buf2->data, buf2->sz);
printf ("test_copy(): str2 = %s\ntest_copy(): str3 = %s\n", str2, str3);
xfree (str2);
xfree (str3);
cbuf_delete (buf1);
cbuf_delete (buf2);
}
int
cbufq_pullup(cbufq_t *cbufq, size_t min_contig)
{
cbuf_t *cbuf0, *cbuf1;
size_t sz, pos0;
if (min_contig == 0) {
return (0);
}
top:
/*
* Case 1: There are no buffers.
*/
if (cbufq->cbufq_count == 0) {
VERIFY(list_is_empty(&cbufq->cbufq_bufs));
errno = EIO;
return (-1);
}
/*
* Case 2: There is one buffer.
*/
if (cbufq->cbufq_count == 1) {
VERIFY(!list_is_empty(&cbufq->cbufq_bufs));
VERIFY(list_head(&cbufq->cbufq_bufs) ==
list_tail(&cbufq->cbufq_bufs));
if (min_contig > cbuf_available(list_head(
&cbufq->cbufq_bufs))) {
errno = EIO;
return (-1);
}
return (0);
}
/*
* Case 3: There are two or more buffers.
*/
VERIFY(!list_is_empty(&cbufq->cbufq_bufs));
VERIFY(list_head(&cbufq->cbufq_bufs) != list_tail(&cbufq->cbufq_bufs));
cbuf0 = list_head(&cbufq->cbufq_bufs);
if (min_contig <= cbuf_available(cbuf0)) {
/*
* The first buffer is long enough.
*/
return (0);
}
VERIFY0(cbuf_safe_add(&sz, cbuf_available(cbuf0), cbuf_unused(cbuf0)));
if (min_contig > sz) {
/*
* The first buffer does not even have enough backing store to
* allow for the requested minimum contiguous length. Extend
* the buffer.
*/
if (cbuf_extend(cbuf0, min_contig - cbuf_position(cbuf0)) != 0) {
return (-1);
}
}
/*
* Preserve the original position for the first buffer in the queue; it
* will be restored after the copying. Resume putting to the buffer at
* the current limit.
*/
pos0 = cbuf_position(cbuf0);
cbuf_resume(cbuf0);
cbuf1 = list_next(&cbufq->cbufq_bufs, cbuf0);
cbuf_copy(cbuf1, cbuf0);
if (cbuf_available(cbuf1) == 0) {
/*
* Consign this buffer to the scrap heap, as it is now empty.
*/
list_remove(&cbufq->cbufq_bufs, cbuf1);
cbufq->cbufq_count--;
cbuf_free(cbuf1);
}
cbuf_flip(cbuf0);
VERIFY0(cbuf_position_set(cbuf0, pos0));
goto top;
}
