107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
//===-- llvm/Support/FormattedStream.cpp - Formatted streams ----*- C++ -*-===//
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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 file contains the implementation of formatted_raw_ostream.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FormattedStream.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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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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