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vbindiff.cpp
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vbindiff.cpp
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//--------------------------------------------------------------------
//
// Visual Binary Diff
// Copyright 1995-2017 by Christopher J. Madsen
//
// Visual display of differences in binary files
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//--------------------------------------------------------------------
#include "config.h"
#include <ctype.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
#include <iostream>
#include <sstream>
#include <map>
#include <string>
#include <vector>
using namespace std;
#include "GetOpt/GetOpt.hpp"
#include "ConWin.hpp"
#include "FileIO.hpp"
const char titleString[] =
"\nVBinDiff " PACKAGE_VERSION "\nCopyright 1995-2017 Christopher J. Madsen";
void exitMsg(int status, const char* message);
void usage(bool showHelp=true, int exitStatus=0);
//====================================================================
// Type definitions:
typedef unsigned char Byte;
typedef unsigned short Word;
typedef Byte Command;
enum LockState { lockNeither = 0, lockTop, lockBottom };
//--------------------------------------------------------------------
// Strings:
typedef string String;
typedef String::size_type StrIdx;
typedef String::iterator StrItr;
typedef String::const_iterator StrConstItr;
//--------------------------------------------------------------------
// Vectors:
typedef vector<String> StrVec;
typedef StrVec::iterator SVItr;
typedef StrVec::const_iterator SVConstItr;
typedef StrVec::size_type VecSize;
//--------------------------------------------------------------------
// Map:
typedef map<VecSize, String> StrMap;
typedef StrMap::value_type SMVal;
typedef StrMap::iterator SMItr;
typedef StrMap::const_iterator SMConstItr;
//====================================================================
// Constants:
const Command cmmMove = 0x80;
const Command cmmMoveSize = 0x03;
const Command cmmMoveForward = 0x04;
const Command cmmMoveTop = 0x08;
const Command cmmMoveBottom = 0x10;
const Command cmmMoveByte = 0x00; // Move 1 byte
const Command cmmMoveLine = 0x01; // Move 1 line
const Command cmmMovePage = 0x02; // Move 1 page
const Command cmmMoveAll = 0x03; // Move to beginning or end
const Command cmmMoveBoth = cmmMoveTop|cmmMoveBottom;
const Command cmgGoto = 0x04; // Commands 4-7
const Command cmgGotoTop = 0x01;
const Command cmgGotoBottom = 0x02;
const Command cmgGotoBoth = cmgGotoTop|cmgGotoBottom;
const Command cmgGotoMask = ~cmgGotoBoth;
const Command cmNothing = 0;
const Command cmNextDiff = 1;
const Command cmQuit = 2;
const Command cmEditTop = 8;
const Command cmEditBottom = 9;
const Command cmUseTop = 10;
const Command cmUseBottom = 11;
const Command cmToggleASCII = 12;
const Command cmFind = 16; // Commands 16-19
const short leftMar = 11; // Starting column of hex display
const short leftMar2 = 61; // Starting column of ASCII display
const int lineWidth = 16; // Number of bytes displayed per line
const int promptHeight = 4; // Height of prompt window
const int inWidth = 10; // Width of input window (excluding border)
const int screenWidth = 80;
const int maxPath = 260;
const VecSize maxHistory = 2000;
const char hexDigits[] = "0123456789ABCDEF";
#include "tables.h" // ASCII and EBCDIC tables
//====================================================================
// Class Declarations:
void showEditPrompt();
void showPrompt();
class Difference;
union FileBuffer
{
Byte line[1][lineWidth];
Byte buffer[lineWidth];
}; // end FileBuffer
class FileDisplay
{
friend class Difference;
protected:
int bufContents;
FileBuffer* data;
const Difference* diffs;
File file;
char fileName[maxPath];
FPos offset;
ConWindow win;
bool writable;
int yPos;
public:
FileDisplay();
~FileDisplay();
void init(int y, const Difference* aDiff=NULL,
const char* aFileName=NULL);
void resize();
void shutDown();
void display();
bool edit(const FileDisplay* other);
const Byte* getBuffer() const { return data->buffer; };
void move(int step) { moveTo(offset + step); };
void moveTo(FPos newOffset);
bool moveTo(const Byte* searchFor, int searchLen);
void moveToEnd(FileDisplay* other);
bool setFile(const char* aFileName);
protected:
void setByte(short x, short y, Byte b);
}; // end FileDisplay
class Difference
{
friend void FileDisplay::display();
protected:
FileBuffer* data;
const FileDisplay* file1;
const FileDisplay* file2;
int numDiffs;
public:
Difference(const FileDisplay* aFile1, const FileDisplay* aFile2);
~Difference();
int compute();
int getNumDiffs() const { return numDiffs; };
void resize();
}; // end Difference
class InputManager
{
private:
char* buf; // The editing buffer
const char* restrict; // If non-NULL, only allow these chars
StrVec& history; // The history vector to use
StrMap historyOverlay; // Overlay of modified history entries
VecSize historyPos; // The current offset into history[]
int maxLen; // The size of buf (not including NUL)
int len; // The current length of the string
int i; // The current cursor position
bool upcase; // Force all characters to uppercase?
bool splitHex; // Entering space-separated hex bytes?
bool insert; // False for overstrike mode
public:
InputManager(char* aBuf, int aMaxLen, StrVec& aHistory);
bool run();
void setCharacters(const char* aRestriction) { restrict = aRestriction; };
void setSplitHex(bool val) { splitHex = val; };
void setUpcase(bool val) { upcase = val; };
private:
bool normalize(int pos);
void useHistory(int delta);
}; // end InputManager
//====================================================================
// Global Variables:
String lastSearch;
StrVec hexSearchHistory, textSearchHistory, positionHistory;
ConWindow promptWin,inWin;
FileDisplay file1, file2;
Difference diffs(&file1, &file2);
const char* displayTable = asciiDisplayTable;
const char* program_name; // Name under which this program was invoked
LockState lockState = lockNeither;
bool singleFile = false;
int numLines = 9; // Number of lines of each file to display
int bufSize = numLines * lineWidth;
int linesBetween = 1; // Number of lines of padding between files
// The number of bytes to move for each possible step size:
// See cmmMoveByte, cmmMoveLine, cmmMovePage
int steps[4] = {1, lineWidth, bufSize-lineWidth, 0};
//====================================================================
// Miscellaneous Functions:
//--------------------------------------------------------------------
// Beep the speaker:
#ifdef WIN32_CONSOLE // beep() is defined by ncurses
void beep()
{
MessageBeep(-1);
} // end beep
#endif // WIN32_CONSOLE
//--------------------------------------------------------------------
// Convert a character to uppercase:
//
// The standard toupper(c) isn't guaranteed for arbitrary integers.
int safeUC(int c)
{
return (c >= 0 && c <= UCHAR_MAX) ? toupper(c) : c;
} // end safeUC
//====================================================================
// Class Difference:
//
// Member Variables:
// file1, file2:
// The FileDisplay objects being compared
// numDiffs:
// The number of differences between the two FileDisplay buffers
// line/table:
// An array of bools for each byte in the FileDisplay buffers
// True marks differences
//
//--------------------------------------------------------------------
// Constructor:
//
// Input:
// aFile1, aFile2:
// Pointers to the FileDisplay objects to compare
Difference::Difference(const FileDisplay* aFile1, const FileDisplay* aFile2)
: data(NULL),
file1(aFile1),
file2(aFile2)
{
} // end Difference::Difference
//--------------------------------------------------------------------
Difference::~Difference()
{
delete [] reinterpret_cast<Byte*>(data);
} // end Difference::~Difference
//--------------------------------------------------------------------
// Compute differences:
//
// Input Variables:
// file1, file2: The files to compare
//
// Returns:
// The number of differences between the buffers
// -1 if both buffers are empty
//
// Output Variables:
// numDiffs: The number of differences between the buffers
int Difference::compute()
{
if (singleFile)
// We return 1 so that cmNextDiff won't keep searching:
return (file1->bufContents ? 1 : -1);
memset(data->buffer, 0, bufSize); // Clear the difference table
int different = 0;
const Byte* buf1 = file1->data->buffer;
const Byte* buf2 = file2->data->buffer;
int size = min(file1->bufContents, file2->bufContents);
int i;
for (i = 0; i < size; i++)
if (*(buf1++) != *(buf2++)) {
data->buffer[i] = true;
++different;
}
size = max(file1->bufContents, file2->bufContents);
if (i < size) {
// One buffer has more data than the other:
different += size - i;
for (; i < size; i++)
data->buffer[i] = true; // These bytes are only in 1 buffer
} else if (!size)
return -1; // Both buffers are empty
numDiffs = different;
return different;
} // end Difference::compute
//--------------------------------------------------------------------
void Difference::resize()
{
if (singleFile) return;
if (data)
delete [] reinterpret_cast<Byte*>(data);
data = reinterpret_cast<FileBuffer*>(new Byte[bufSize]);
} // end Difference::resize
//====================================================================
// Class FileDisplay:
//
// Member Variables:
// bufContents:
// The number of bytes in the file buffer
// diffs:
// A pointer to the Difference object related to this file
// file:
// The file being displayed
// fileName:
// The relative pathname of the file being displayed
// offset:
// The position in the file of the first byte in the buffer
// win:
// The handle of the window used for display
// yPos:
// The vertical position of the display window
// buffer/line:
// The currently displayed portion of the file
//
//--------------------------------------------------------------------
// Constructor:
FileDisplay::FileDisplay()
: bufContents(0),
data(NULL),
diffs(NULL),
offset(0),
writable(false),
yPos(0)
{
fileName[0] = '\0';
} // end FileDisplay::FileDisplay
//--------------------------------------------------------------------
// Initialize:
//
// Creates the display window and opens the file.
//
// Input:
// y: The vertical position of the display window
// aDiff: The Difference object related to this buffer
// aFileName: The name of the file to display
void FileDisplay::init(int y, const Difference* aDiff,
const char* aFileName)
{
diffs = aDiff;
yPos = y;
win.init(0,y, screenWidth, (numLines + 1 + ((y==0) ? linesBetween : 0)),
cFileWin);
resize();
if (aFileName)
setFile(aFileName);
} // end FileDisplay::init
//--------------------------------------------------------------------
// Destructor:
FileDisplay::~FileDisplay()
{
shutDown();
CloseFile(file);
delete [] reinterpret_cast<Byte*>(data);
} // end FileDisplay::~FileDisplay
//--------------------------------------------------------------------
void FileDisplay::resize()
{
if (data)
delete [] reinterpret_cast<Byte*>(data);
data = reinterpret_cast<FileBuffer*>(new Byte[bufSize]);
// FIXME resize window
} // end FileDisplay::resize
//--------------------------------------------------------------------
// Shut down the file display:
//
// Deletes the display window.
void FileDisplay::shutDown()
{
win.close();
} // end FileDisplay::shutDown
//--------------------------------------------------------------------
// Display the file contents:
void FileDisplay::display()
{
if (!fileName[0]) return;
FPos lineOffset = offset;
short i,j,index,lineLength;
char buf[lineWidth + lineWidth/8 + 1];
buf[sizeof(buf)-1] = '\0';
char buf2[screenWidth+1];
buf2[screenWidth] = '\0';
memset(buf, ' ', sizeof(buf)-1);
for (i = 0; i < numLines; i++) {
// cerr << i << '\n';
char* str = buf2;
str +=
sprintf(str, "%04X %04X:",Word(lineOffset>>16),Word(lineOffset&0xFFFF));
lineLength = min(lineWidth, bufContents - i*lineWidth);
for (j = 0, index = -1; j < lineLength; j++) {
if (j % 8 == 0) {
*(str++) = ' ';
++index;
}
str += sprintf(str, "%02X ", data->line[i][j]);
buf[index++] = displayTable[data->line[i][j]];
}
if (index < 0) index = 0; // in case nothing was printed in this line
memset(buf + index, ' ', sizeof(buf) - index - 1);
memset(str, ' ', screenWidth - (str - buf2));
win.put(0,i+1, buf2);
win.put(leftMar2,i+1, buf);
if (diffs)
for (j = 0; j < lineWidth; j++)
if (diffs->data->line[i][j]) {
win.putAttribs(j*3 + leftMar + (j>7),i+1, cFileDiff,2);
win.putAttribs(j + leftMar2 + (j>7),i+1, cFileDiff,1);
}
lineOffset += lineWidth;
} // end for i up to numLines
win.update();
} // end FileDisplay::display
//--------------------------------------------------------------------
// Edit the file:
//
// Returns:
// true: File changed
// false: File did not change
bool FileDisplay::edit(const FileDisplay* other)
{
if (!bufContents && offset)
return false; // You must not be completely past EOF
if (!writable) {
File w = OpenFile(fileName, true);
if (w == InvalidFile) return false;
CloseFile(file);
file = w;
writable = true;
}
if (bufContents < bufSize)
memset(data->buffer + bufContents, 0, bufSize - bufContents);
short x = 0;
short y = 0;
bool hiNib = true;
bool ascii = false;
bool changed = false;
int key;
const Byte *const inputTable = ((displayTable == ebcdicDisplayTable)
? ascii2ebcdicTable
: NULL); // No translation
showEditPrompt();
win.setCursor(leftMar,1);
ConWindow::showCursor();
for (;;) {
win.setCursor((ascii ? leftMar2 + x : leftMar + 3*x + !hiNib) + (x / 8),
y+1);
key = win.readKey();
switch (key) {
case KEY_ESCAPE: goto done;
case KEY_TAB:
hiNib = true;
ascii = !ascii;
break;
case KEY_DELETE:
case KEY_BACKSPACE:
case KEY_LEFT:
if (!hiNib)
hiNib = true;
else {
if (!ascii) hiNib = false;
if (--x < 0) x = lineWidth-1;
}
if (hiNib || (x < lineWidth-1))
break;
// else fall thru
case KEY_UP: if (--y < 0) y = numLines-1; break;
default: {
short newByte = -1;
if ((key == KEY_RETURN) && other &&
(other->bufContents > x + y*lineWidth)) {
newByte = other->data->line[y][x]; // Copy from other file
hiNib = ascii; // Always advance cursor to next byte
} else if (ascii) {
if (isprint(key)) newByte = (inputTable ? inputTable[key] : key);
} else { // hex
if (isdigit(key))
newByte = key - '0';
else if (isxdigit(key))
newByte = safeUC(key) - 'A' + 10;
if (newByte >= 0) {
if (hiNib)
newByte = (newByte * 0x10) | (0x0F & data->line[y][x]);
else
newByte |= 0xF0 & data->line[y][x];
} // end if valid digit entered
} // end else hex
if (newByte >= 0) {
changed = true;
setByte(x,y,newByte);
} else
break;
} // end default and fall thru
case KEY_RIGHT:
if (hiNib && !ascii)
hiNib = false;
else {
hiNib = true;
if (++x >= lineWidth) x = 0;
}
if (x || !hiNib)
break;
// else fall thru
case KEY_DOWN: if (++y >= numLines) y = 0; break;
} // end switch
} // end forever
done:
if (changed) {
promptWin.clear();
promptWin.border();
promptWin.put(30,1,"Save changes (Y/N):");
promptWin.update();
promptWin.setCursor(50,1);
key = promptWin.readKey();
if (safeUC(key) != 'Y') {
changed = false;
moveTo(offset); // Re-read buffer contents
} else {
SeekFile(file, offset);
WriteFile(file, data->buffer, bufContents);
}
}
showPrompt();
ConWindow::hideCursor();
return changed;
} // end FileDisplay::edit
//--------------------------------------------------------------------
void FileDisplay::setByte(short x, short y, Byte b)
{
if (x + y*lineWidth >= bufContents) {
if (x + y*lineWidth > bufContents) {
short y1 = bufContents / lineWidth;
short x1 = bufContents % lineWidth;
while (y1 <= numLines) {
while (x1 < lineWidth) {
if ((x1 == x) && (y1 == y)) goto done;
setByte(x1,y1,0);
++x1;
}
x1 = 0;
++y1;
} // end while y1
} // end if more than 1 byte past the end
done:
++bufContents;
data->line[y][x] = b ^ 1; // Make sure it's different
} // end if past the end
if (data->line[y][x] != b) {
data->line[y][x] = b;
char str[3];
sprintf(str, "%02X", b);
win.setAttribs(cFileEdit);
win.put(leftMar + 3*x + (x / 8), y+1, str);
str[0] = displayTable[b];
str[1] = '\0';
win.put(leftMar2 + x + (x / 8), y+1, str);
win.setAttribs(cFileWin);
win.update();
}
} // end FileDisplay::setByte
//--------------------------------------------------------------------
// Change the file position:
//
// Changes the file offset and updates the buffer.
// Does not update the display.
//
// Input:
// step:
// The number of bytes to move
// A negative value means to move backward
//
// void FileDisplay::move(int step) /* Inline function */
//--------------------------------------------------------------------
// Change the file position:
//
// Changes the file offset and updates the buffer.
// Does not update the display.
//
// Input:
// newOffset:
// The new position of the file
void FileDisplay::moveTo(FPos newOffset)
{
if (!fileName[0]) return; // No file
offset = newOffset;
if (offset < 0)
offset = 0;
SeekFile(file, offset);
bufContents = ReadFile(file, data->buffer, bufSize);
} // end FileDisplay::moveTo
//--------------------------------------------------------------------
// Change the file position by searching:
//
// Changes the file offset and updates the buffer.
// Does not update the display.
//
// Input:
// searchFor: The bytes to search for
// searchLen: The number of bytes in searchFor
//
// Returns:
// true: The search was successful
// false: Search unsuccessful, file not moved
bool FileDisplay::moveTo(const Byte* searchFor, int searchLen)
{
if (!fileName[0]) return true; // No file, pretend success
// Using algorithm based on QuickSearch:
// http://www-igm.univ-mlv.fr/~lecroq/string/node19.htm
// Compute offset table:
int i;
int moveOver[256];
for (i = 0; i < 256; ++i)
moveOver[i] = searchLen + 1;
for (i = 0; i < searchLen; ++i)
moveOver[searchFor[i]] = searchLen - i;
// Prepare the search buffer:
const int
blockSize = 8 * 1024,
moveLength = searchLen,
restartAt = blockSize - moveLength,
fullStop = blockSize * 2 - moveLength;
Byte *const searchBuf = new Byte[2 * blockSize];
Byte *const copyTo = searchBuf + restartAt;
const Byte *const copyFrom = searchBuf + fullStop;
char *const readAt = reinterpret_cast<char*>(searchBuf) + blockSize;
FPos newPos = offset + 1;
SeekFile(file, newPos);
Size bytesRead = ReadFile(file, searchBuf, blockSize * 2);
int stopAt = bytesRead - moveLength;
// Start the search:
i = 0;
for (;;) {
if (stopAt < fullStop) ++stopAt;
while (i < stopAt) {
if (memcmp(searchFor, searchBuf + i, searchLen) == 0)
goto done;
i += moveOver[searchBuf[i + searchLen]]; // shift
} // end while more buffer to search
if (stopAt != fullStop) {
i = -1;
goto done;
} // Nothing more to read
newPos += blockSize;
i -= blockSize;
memcpy(copyTo, copyFrom, moveLength);
bytesRead = ReadFile(file, readAt, blockSize);
stopAt = bytesRead + blockSize - moveLength;
} // end forever
done:
delete [] searchBuf;
if (i < 0) return false; // No match
moveTo(newPos + i);
return true;
} // end FileDisplay::moveTo
//--------------------------------------------------------------------
// Move to the end of the file:
//
// Input:
// other: If non NULL, move both files to the end of the shorter file
void FileDisplay::moveToEnd(FileDisplay* other)
{
if (!fileName[0]) return; // No file
FPos end = SeekFile(file, 0, SeekEnd);
FPos diff = 0;
if (other) {
// If the files aren't currently at the same position,
// we want to keep them offset by the same amount:
diff = other->offset - offset;
end = min(end, SeekFile(other->file, 0, SeekEnd) - diff);
} // end if moving other file too
end -= steps[cmmMovePage];
end -= end % 0x10;
moveTo(end);
if (other) other->moveTo(end + diff);
} // end FileDisplay::moveToEnd
//--------------------------------------------------------------------
// Open a file for display:
//
// Opens the file, updates the filename display, and reads the start
// of the file into the buffer.
//
// Input:
// aFileName: The name of the file to open
//
// Returns:
// True: Operation successful
// False: Unable to open file (call ErrorMsg for error message)
bool FileDisplay::setFile(const char* aFileName)
{
strncpy(fileName, aFileName, maxPath);
fileName[maxPath-1] = '\0';
win.put(0,0, fileName);
win.putAttribs(0,0, cFileName, screenWidth);
win.update(); // FIXME
bufContents = 0;
file = OpenFile(fileName);
writable = false;
if (file == InvalidFile)
return false;
offset = 0;
bufContents = ReadFile(file, data->buffer, bufSize);
return true;
} // end FileDisplay::setFile
//====================================================================
// Main Program:
//--------------------------------------------------------------------
void calcScreenLayout(bool resize = true)
{
int screenX, screenY;
ConWindow::getScreenSize(screenX, screenY);
if (screenX < screenWidth) {
ostringstream err;
err << "The screen must be at least "
<< screenWidth << " characters wide.";
exitMsg(2, err.str().c_str());
}
if (screenY < promptHeight + 4) {
ostringstream err;
err << "The screen must be at least "
<< (promptHeight + 4) << " lines high.";
exitMsg(2, err.str().c_str());
}
numLines = screenY - promptHeight - (singleFile ? 1 : 2);
if (singleFile)
linesBetween = 0;
else {
linesBetween = numLines % 2;
numLines = (numLines - linesBetween) / 2;
}
bufSize = numLines * lineWidth;
steps[cmmMovePage] = bufSize-lineWidth;
// FIXME resize existing windows
} // end calcScreenLayout
//--------------------------------------------------------------------
void displayCharacterSet()
{
const bool isASCII = (displayTable == asciiDisplayTable);
promptWin.putAttribs(3,2, (isASCII ? cCurrentMode : cBackground), 5);
promptWin.putAttribs(9,2, (isASCII ? cBackground : cCurrentMode), 6);
promptWin.update();
} // end displayCharacterSet
//--------------------------------------------------------------------
void displayLockState()
{
#ifndef WIN32_CONSOLE // The Win32 version uses Ctrl & Alt instead
if (singleFile) return;
promptWin.putAttribs(63,1,
((lockState == lockBottom) ? cCurrentMode : cBackground),
8);
promptWin.putAttribs(63,2,
((lockState == lockTop) ? cCurrentMode : cBackground),
11);
#endif
} // end displayLockState
//--------------------------------------------------------------------
// Print a message to stderr and exit:
//
// Input:
// status: The exit status to use
// message: The message to print
void exitMsg(int status, const char* message)
{
ConWindow::shutdown();
cerr << endl << message << endl;
exit(status);
} // end exitMsg
//--------------------------------------------------------------------
// Normalize the string in the input window:
//
// Does nothing unless splitHex mode is active.
//
// Input:
// pos: The position of the cursor in buf
//
// Returns:
// true: The input buffer was changed
// false: No changes were necessary
bool InputManager::normalize(int pos)
{
if (!splitHex) return false;
// Change D_ to 0D:
if (pos && buf[pos] == ' ' && buf[pos-1] != ' ') {
buf[pos] = buf[pos-1];
buf[pos-1] = '0';
if (pos == len) len += 2;
return true;
}
// Change _D to 0D:
if (pos < len && buf[pos] == ' ' && buf[pos+1] != ' ') {
buf[pos] = '0';
return true;
}
return false; // No changes necessary
} // end InputManager::normalize
//--------------------------------------------------------------------
// Get a string using inWin:
//
// Input:
// buf: The buffer where the string will be stored
// maxLen: The maximum number of chars to accept (not including NUL byte)
// history: The history vector to use
// restrict: If not NULL, accept only chars in this string
// upcase: If true, convert all chars with safeUC
void getString(char* buf, int maxLen, StrVec& history,
const char* restrict=NULL,
bool upcase=false, bool splitHex=false)
{
InputManager manager(buf, maxLen, history);
manager.setCharacters(restrict);
manager.setSplitHex(splitHex);
manager.setUpcase(upcase);
manager.run();
} // end getString
//--------------------------------------------------------------------
// Construct the InputManager object:
//
// Input:
// aBuf: The buffer where the string will be stored
// aMaxLen: The maximum number of chars to accept (not including NUL byte)
// aHistory: The history vector to use
InputManager::InputManager(char* aBuf, int aMaxLen, StrVec& aHistory)
: buf(aBuf),
restrict(NULL),