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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
108 lines
3.5 KiB
C++
108 lines
3.5 KiB
C++
//===-- llvm/Support/FormattedStream.cpp - Formatted streams ----*- C++ -*-===//
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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 file contains the implementation of formatted_raw_ostream.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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using namespace llvm;
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/// UpdatePosition - Examine the given char sequence and figure out which
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/// column we end up in after output, and how many line breaks are contained.
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///
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static void UpdatePosition(std::pair<unsigned, unsigned> &Position, const char *Ptr, size_t Size) {
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unsigned &Column = Position.first;
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unsigned &Line = Position.second;
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// Keep track of the current column and line by scanning the string for
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// special characters
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for (const char *End = Ptr + Size; Ptr != End; ++Ptr) {
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++Column;
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switch (*Ptr) {
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case '\n':
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Line += 1;
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LLVM_FALLTHROUGH;
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case '\r':
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Column = 0;
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break;
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case '\t':
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// Assumes tab stop = 8 characters.
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Column += (8 - (Column & 0x7)) & 0x7;
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break;
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}
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}
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}
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/// ComputePosition - Examine the current output and update line and column
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/// counts.
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void formatted_raw_ostream::ComputePosition(const char *Ptr, size_t Size) {
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// If our previous scan pointer is inside the buffer, assume we already
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// scanned those bytes. This depends on raw_ostream to not change our buffer
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// in unexpected ways.
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if (Ptr <= Scanned && Scanned <= Ptr + Size)
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// Scan all characters added since our last scan to determine the new
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// column.
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UpdatePosition(Position, Scanned, Size - (Scanned - Ptr));
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else
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UpdatePosition(Position, Ptr, Size);
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// Update the scanning pointer.
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Scanned = Ptr + Size;
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}
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/// PadToColumn - Align the output to some column number.
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///
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/// \param NewCol - The column to move to.
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///
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formatted_raw_ostream &formatted_raw_ostream::PadToColumn(unsigned NewCol) {
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// Figure out what's in the buffer and add it to the column count.
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ComputePosition(getBufferStart(), GetNumBytesInBuffer());
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// Output spaces until we reach the desired column.
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indent(std::max(int(NewCol - getColumn()), 1));
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return *this;
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}
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void formatted_raw_ostream::write_impl(const char *Ptr, size_t Size) {
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// Figure out what's in the buffer and add it to the column count.
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ComputePosition(Ptr, Size);
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// Write the data to the underlying stream (which is unbuffered, so
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// the data will be immediately written out).
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TheStream->write(Ptr, Size);
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// Reset the scanning pointer.
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Scanned = nullptr;
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}
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/// fouts() - This returns a reference to a formatted_raw_ostream for
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/// standard output. Use it like: fouts() << "foo" << "bar";
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formatted_raw_ostream &llvm::fouts() {
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static formatted_raw_ostream S(outs());
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return S;
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}
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/// ferrs() - This returns a reference to a formatted_raw_ostream for
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/// standard error. Use it like: ferrs() << "foo" << "bar";
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formatted_raw_ostream &llvm::ferrs() {
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static formatted_raw_ostream S(errs());
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return S;
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}
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/// fdbgs() - This returns a reference to a formatted_raw_ostream for
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/// the debug stream. Use it like: fdbgs() << "foo" << "bar";
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formatted_raw_ostream &llvm::fdbgs() {
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static formatted_raw_ostream S(dbgs());
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return S;
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}
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