77 lines
1.9 KiB
C
77 lines
1.9 KiB
C
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef HAVE_SYS_UIO_H
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#include <cutils/uio.h>
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#include <unistd.h>
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int readv( int fd, struct iovec* vecs, int count )
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{
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int total = 0;
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for ( ; count > 0; count--, vecs++ ) {
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const char* buf = vecs->iov_base;
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int len = vecs->iov_len;
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while (len > 0) {
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int ret = read( fd, buf, len );
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if (ret < 0) {
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if (total == 0)
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total = -1;
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goto Exit;
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}
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if (ret == 0)
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goto Exit;
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total += ret;
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buf += ret;
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len -= ret;
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}
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}
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Exit:
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return total;
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}
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int writev( int fd, const struct iovec* vecs, int count )
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{
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int total = 0;
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for ( ; count > 0; count--, vecs++ ) {
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const char* buf = (const char*)vecs->iov_base;
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int len = (int)vecs->iov_len;
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while (len > 0) {
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int ret = write( fd, buf, len );
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if (ret < 0) {
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if (total == 0)
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total = -1;
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goto Exit;
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}
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if (ret == 0)
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goto Exit;
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total += ret;
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buf += ret;
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len -= ret;
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}
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}
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Exit:
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return total;
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}
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#endif /* !HAVE_SYS_UIO_H */
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