67 lines
2.0 KiB
C
67 lines
2.0 KiB
C
/****************************************************************************
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* fs/vfs/fs_uio.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/uio.h>
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#include <sys/types.h>
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#include <nuttx/fs/fs.h>
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#include <assert.h>
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#include <errno.h>
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: uio_total_len
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*
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* Description:
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* Return the total length of data in bytes.
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* Or -EOVERFLOW.
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*
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****************************************************************************/
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ssize_t uio_total_len(FAR const struct uio *uio)
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{
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const struct iovec *iov = uio->uio_iov;
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int iovcnt = uio->uio_iovcnt;
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size_t len = 0;
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int i;
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for (i = 0; i < iovcnt; i++)
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{
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if (SSIZE_MAX - len < iov[i].iov_len)
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{
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return -EOVERFLOW;
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}
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len += iov[i].iov_len;
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}
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return len;
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}
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