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e59011e7d9
and outputs it when explicitly flushed. The intent is to use it in situations such as debug output logging where a signal handler can take care of flushing the buffer at program termination. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92001 91177308-0d34-0410-b5e6-96231b3b80d8
48 lines
1.3 KiB
C++
48 lines
1.3 KiB
C++
//===- circulat_raw_ostream.cpp - Implement the circular_raw_ostream class -===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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 = std::min(Size, 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(void) {
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if (BufferSize != 0) {
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// Write out the buffer
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int num = std::strlen(Banner);
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TheStream->write(Banner, num);
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flushBuffer();
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}
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}
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