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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77461 91177308-0d34-0410-b5e6-96231b3b80d8
79 lines
2.5 KiB
C++
79 lines
2.5 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/FormattedStream.h"
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#include <algorithm>
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using namespace llvm;
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/// ComputeColumn - Examine the current output and figure out which
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/// column we end up in after output.
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///
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void formatted_raw_ostream::ComputeColumn() {
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// Keep track of the current column by scanning the string for
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// special characters
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// The buffer may have been allocated underneath us.
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if (Scanned == 0 && GetNumBytesInBuffer() != 0) {
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Scanned = begin();
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}
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while (Scanned != end()) {
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++ColumnScanned;
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if (*Scanned == '\n' || *Scanned == '\r')
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ColumnScanned = 0;
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else if (*Scanned == '\t')
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// Assumes tab stop = 8 characters.
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ColumnScanned += (8 - (ColumnScanned & 0x7)) & 0x7;
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++Scanned;
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}
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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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/// \param MinPad - The minimum space to give after the most recent
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/// I/O, even if the current column + minpad > newcol.
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///
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void formatted_raw_ostream::PadToColumn(unsigned NewCol, unsigned MinPad) {
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// Figure out what's in the buffer and add it to the column count.
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ComputeColumn();
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// Output spaces until we reach the desired column.
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unsigned num = NewCol - ColumnScanned;
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if (NewCol < ColumnScanned || num < MinPad)
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num = MinPad;
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// Keep a buffer of spaces handy to speed up processing.
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const char *Spaces = " "
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" ";
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assert(num < MAX_COLUMN_PAD && "Unexpectedly large column padding");
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write(Spaces, num);
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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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