qioerr qbuffer_copyin_buffer(qbuffer_t* dst, qbuffer_iter_t dst_start, qbuffer_iter_t dst_end,
qbuffer_t* src, qbuffer_iter_t src_start, qbuffer_iter_t src_end)
{
int64_t dst_num_bytes = qbuffer_iter_num_bytes(dst_start, dst_end);
ssize_t dst_num_parts = qbuffer_iter_num_parts(dst_start, dst_end);
int64_t src_num_bytes = qbuffer_iter_num_bytes(src_start, src_end);
ssize_t src_num_parts = qbuffer_iter_num_parts(src_start, src_end);
struct iovec* iov = NULL;
size_t iovcnt;
size_t i;
MAYBE_STACK_SPACE(struct iovec, iov_onstack);
qioerr err;
qbuffer_iter_t dst_cur, dst_cur_end;
if( dst == src ) QIO_RETURN_CONSTANT_ERROR(EINVAL, "cannot copy a buffer to itself");
if( dst_num_bytes < 0 || dst_num_parts < 0 || dst_start.offset < dst->offset_start || dst_end.offset > dst->offset_end ) QIO_RETURN_CONSTANT_ERROR(EINVAL, "dst range outside of buffer");
if( src_num_bytes < 0 || src_num_parts < 0 || src_start.offset < src->offset_start || src_end.offset > src->offset_end ) QIO_RETURN_CONSTANT_ERROR(EINVAL, "src range outside of buffer");
MAYBE_STACK_ALLOC(struct iovec, src_num_parts, iov, iov_onstack);
if( ! iov ) return QIO_ENOMEM;
err = qbuffer_to_iov(src, src_start, src_end, src_num_parts, iov, NULL, &iovcnt);
if( err ) goto error;
dst_cur = dst_start;
for( i = 0; i < iovcnt; i++ ) {
dst_cur_end = dst_cur;
qbuffer_iter_advance(dst, &dst_cur_end, iov[i].iov_len);
err = qbuffer_copyin(dst, dst_cur, dst_cur_end, iov[i].iov_base, iov[i].iov_len);
if( err ) goto error;
dst_cur = dst_cur_end;
}
MAYBE_STACK_FREE(iov, iov_onstack);
return 0;
error:
MAYBE_STACK_FREE(iov, iov_onstack);
return err;
}
err_t qbuffer_copyin_buffer(qbuffer_t* dst, qbuffer_iter_t dst_start, qbuffer_iter_t dst_end,
qbuffer_t* src, qbuffer_iter_t src_start, qbuffer_iter_t src_end)
{
int64_t dst_num_bytes = qbuffer_iter_num_bytes(dst_start, dst_end);
ssize_t dst_num_parts = qbuffer_iter_num_parts(dst_start, dst_end);
int64_t src_num_bytes = qbuffer_iter_num_bytes(src_start, src_end);
ssize_t src_num_parts = qbuffer_iter_num_parts(src_start, src_end);
struct iovec* iov = NULL;
size_t iovcnt;
size_t i;
MAYBE_STACK_SPACE(struct iovec, iov_onstack);
err_t err;
qbuffer_iter_t dst_cur, dst_cur_end;
if( dst == src ) return EINVAL;
if( dst_num_bytes < 0 || dst_num_parts < 0 || dst_start.offset < dst->offset_start || dst_end.offset > dst->offset_end ) return EINVAL;
if( src_num_bytes < 0 || src_num_parts < 0 || src_start.offset < src->offset_start || src_end.offset > src->offset_end ) return EINVAL;
MAYBE_STACK_ALLOC(struct iovec, src_num_parts, iov, iov_onstack);
if( ! iov ) return ENOMEM;
err = qbuffer_to_iov(src, src_start, src_end, src_num_parts, iov, NULL, &iovcnt);
if( err ) goto error;
dst_cur = dst_start;
for( i = 0; i < iovcnt; i++ ) {
dst_cur_end = dst_cur;
qbuffer_iter_advance(dst, &dst_cur_end, iov[i].iov_len);
err = qbuffer_copyin(dst, dst_cur, dst_cur_end, iov[i].iov_base, iov[i].iov_len);
if( err ) goto error;
dst_cur = dst_cur_end;
}
MAYBE_STACK_FREE(iov, iov_onstack);
return 0;
error:
MAYBE_STACK_FREE(iov, iov_onstack);
return err;
}
