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//===-- llvm/CodeGen/AsmStream.cpp - AsmStream Framework --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains instantiations of "standard" AsmOStreams.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/FormattedStream.h"
namespace llvm {
/// ComputeColumn - Examine the current output and figure out which
/// column we end up in after output.
///
void formatted_raw_ostream::ComputeColumn(const char *Ptr, unsigned Size)
{
// Keep track of the current column by scanning the string for
// special characters
// Find the last newline. This is our column start. If there
// is no newline, start with the current column.
const char *nlpos = NULL;
for (const char *pos = Ptr + Size, *epos = Ptr; pos > epos; --pos) {
if (*(pos-1) == '\n') {
nlpos = pos-1;
// The newline will be counted, setting this to zero. We
// need to do it this way in case nlpos is Ptr.
Column = -1;
break;
}
}
if (nlpos == NULL) {
nlpos = Ptr;
}
// Walk through looking for tabs and advance column as appropriate
for (const char *pos = nlpos, *epos = Ptr + Size; pos != epos; ++pos) {
++Column;
if (*pos == '\t') {
// Advance to next tab stop (every eight characters)
Column += ((8 - (Column & 0x7)) & 0x7);
assert(!(Column & 0x3) && "Column out of alignment");
}
}
}
/// PadToColumn - Align the output to some column number
///
/// \param NewCol - The column to move to
/// \param MinPad - The minimum space to give after the most recent
/// I/O, even if the current column + minpad > newcol
///
void formatted_raw_ostream::PadToColumn(unsigned NewCol, unsigned MinPad)
{
flush();
// Output spaces until we reach the desired column
unsigned num = NewCol - Column;
if (NewCol < Column || num < MinPad) {
num = MinPad;
}
// TODO: Write a whole string at a time
while (num-- > 0) {
write(' ');
}
}
}
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