forked from OSchip/llvm-project
45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
//===- circular_raw_ostream.cpp - Implement circular_raw_ostream ----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This implements support for circular buffered streams.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/circular_raw_ostream.h"
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#include <algorithm>
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using namespace llvm;
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void circular_raw_ostream::write_impl(const char *Ptr, size_t Size) {
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if (BufferSize == 0) {
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TheStream->write(Ptr, Size);
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return;
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}
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// Write into the buffer, wrapping if necessary.
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while (Size != 0) {
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unsigned Bytes =
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std::min(unsigned(Size), unsigned(BufferSize - (Cur - BufferArray)));
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memcpy(Cur, Ptr, Bytes);
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Size -= Bytes;
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Cur += Bytes;
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if (Cur == BufferArray + BufferSize) {
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// Reset the output pointer to the start of the buffer.
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Cur = BufferArray;
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Filled = true;
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}
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}
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}
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void circular_raw_ostream::flushBufferWithBanner() {
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if (BufferSize != 0) {
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// Write out the buffer
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TheStream->write(Banner, std::strlen(Banner));
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flushBuffer();
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}
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}
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