freebsd-dev/contrib/llvm/lib/Support/circular_raw_ostream.cpp
Roman Divacky f22ef01c33 Import LLVM/clang from vendor stripped of docs/ test/ website/ www/ examples/
in llvm/ and/or llvm/contrib/clang/ respectively.

Approved by:	ed (mentor)
Approved by:	core
2010-06-09 17:59:52 +00:00

46 lines
1.3 KiB
C++

//===- circular_raw_ostream.cpp - Implement circular_raw_ostream ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This implements support for circular buffered streams.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/circular_raw_ostream.h"
#include <algorithm>
using namespace llvm;
void circular_raw_ostream::write_impl(const char *Ptr, size_t Size) {
if (BufferSize == 0) {
TheStream->write(Ptr, Size);
return;
}
// Write into the buffer, wrapping if necessary.
while (Size != 0) {
unsigned Bytes =
std::min(unsigned(Size), unsigned(BufferSize - (Cur - BufferArray)));
memcpy(Cur, Ptr, Bytes);
Size -= Bytes;
Cur += Bytes;
if (Cur == BufferArray + BufferSize) {
// Reset the output pointer to the start of the buffer.
Cur = BufferArray;
Filled = true;
}
}
}
void circular_raw_ostream::flushBufferWithBanner() {
if (BufferSize != 0) {
// Write out the buffer
TheStream->write(Banner, std::strlen(Banner));
flushBuffer();
}
}