//===-- llvm/Support/FormattedStream.cpp - Formatted streams ----*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains the implementation of formatted_raw_ostream.
 //
 //===----------------------------------------------------------------------===//
 

 #include <algorithm>

 #include "llvm/Support/Debug.h"

 #include "llvm/Support/FormattedStream.h"
 
 using namespace llvm;
 
 /// CountColumns - Examine the given char sequence and figure out which
 /// column we end up in after output.
 ///
 static unsigned CountColumns(unsigned Column, const char *Ptr, size_t Size) {
   // Keep track of the current column by scanning the string for
   // special characters
 
   for (const char *End = Ptr + Size; Ptr != End; ++Ptr) {
     ++Column;
     if (*Ptr == '\n' || *Ptr == '\r')
       Column = 0;
     else if (*Ptr == '\t')
       // Assumes tab stop = 8 characters.
       Column += (8 - (Column & 0x7)) & 0x7;
   }
 
   return Column;
 }
 
 /// ComputeColumn - Examine the current output and figure out which
 /// column we end up in after output.
 void formatted_raw_ostream::ComputeColumn(const char *Ptr, size_t Size) {
   // If our previous scan pointer is inside the buffer, assume we already
   // scanned those bytes. This depends on raw_ostream to not change our buffer
   // in unexpected ways.
   if (Ptr <= Scanned && Scanned <= Ptr + Size) {
     // Scan all characters added since our last scan to determine the new
     // column.
     ColumnScanned = CountColumns(ColumnScanned, Scanned, 
                                  Size - (Scanned - Ptr));
   } else
     ColumnScanned = CountColumns(ColumnScanned, Ptr, Size);
 
   // Update the scanning pointer.
   Scanned = Ptr + Size;
 }
 
 /// PadToColumn - Align the output to some column number.
 ///
 /// \param NewCol - The column to move to.
 ///

 formatted_raw_ostream &formatted_raw_ostream::PadToColumn(unsigned NewCol) { 

   // Figure out what's in the buffer and add it to the column count.
   ComputeColumn(getBufferStart(), GetNumBytesInBuffer());
 
   // Output spaces until we reach the desired column.
   indent(std::max(int(NewCol - ColumnScanned), 1));

   return *this;

 }
 
 void formatted_raw_ostream::write_impl(const char *Ptr, size_t Size) {
   // Figure out what's in the buffer and add it to the column count.
   ComputeColumn(Ptr, Size);
 
   // Write the data to the underlying stream (which is unbuffered, so
   // the data will be immediately written out).
   TheStream->write(Ptr, Size);
 
   // Reset the scanning pointer.
   Scanned = 0;
 }
 
 /// fouts() - This returns a reference to a formatted_raw_ostream for
 /// standard output.  Use it like: fouts() << "foo" << "bar";
 formatted_raw_ostream &llvm::fouts() {
   static formatted_raw_ostream S(outs());
   return S;
 }
 
 /// ferrs() - This returns a reference to a formatted_raw_ostream for
 /// standard error.  Use it like: ferrs() << "foo" << "bar";
 formatted_raw_ostream &llvm::ferrs() {
   static formatted_raw_ostream S(errs());
   return S;
 }

 
 /// fdbgs() - This returns a reference to a formatted_raw_ostream for
 /// the debug stream.  Use it like: fdbgs() << "foo" << "bar";
 formatted_raw_ostream &llvm::fdbgs() {
   static formatted_raw_ostream S(dbgs());
   return S;
 }