/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * The contents of this file are subject to the Netscape Public
 * License Version 1.1 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is Netscape
 * Communications Corporation.  Portions created by Netscape are
 * Copyright (C) 1998 Netscape Communications Corporation. All
 * Rights Reserved.
 *
 * Contributor(s): 
 */ 

#include <ctype.h>
#include <string.h> 
#include <stdlib.h>
#include "nsString.h"
#include "nsDebug.h"
#include "nsDeque.h"

#ifndef RICKG_TESTBED
#include "prdtoa.h"
#include "nsISizeOfHandler.h"
#endif 


static const char* kNullPointerError = "Error: unexpected null ptr";
static const char* kWhitespace="\b\t\r\n ";



static void Subsume(nsStr& aDest,nsStr& aSource){
  if(aSource.mStr && aSource.mLength) {
    if(aSource.mOwnsBuffer){
      nsStr::Destroy(aDest);
      aDest.mStr=aSource.mStr;
      aDest.mLength=aSource.mLength;
      aDest.mCharSize=aSource.mCharSize;
      aDest.mCapacity=aSource.mCapacity;
      aDest.mOwnsBuffer=aSource.mOwnsBuffer;
      aSource.mOwnsBuffer=PR_FALSE;
      aSource.mStr=0;
    }
    else{
      nsStr::Assign(aDest,aSource,0,aSource.mLength);
    }
  } 
  else nsStr::Truncate(aDest,0);
}


/**
 * Default constructor. 
 */
nsString::nsString() {
  nsStr::Initialize(*this,eTwoByte);
}

/**
 * This constructor accepts an ascii string
 * @update  gess 1/4/99
 * @param   aCString is a ptr to a 1-byte cstr
 * @param   aLength tells us how many chars to copy from given CString
 */
nsString::nsString(const char* aCString,PRInt32 aCount){  
  nsStr::Initialize(*this,eTwoByte);
  Assign(aCString,aCount);
}

/**
 * This constructor accepts a unicode string
 * @update  gess 1/4/99
 * @param   aString is a ptr to a unichar string
 * @param   aLength tells us how many chars to copy from given aString
 */
nsString::nsString(const PRUnichar* aString,PRInt32 aCount) {  
  nsStr::Initialize(*this,eTwoByte);
  Assign(aString,aCount);
}

/**
 * This constructor works for all other nsSTr derivatives
 * @update  gess 1/4/99
 * @param   reference to another nsCString
 */
nsString::nsString(const nsStr &aString)  {
  nsStr::Initialize(*this,eTwoByte);
  nsStr::Assign(*this,aString,0,aString.mLength);
}

/**
 * This is our copy constructor 
 * @update  gess 1/4/99
 * @param   reference to another nsString
 */
nsString::nsString(const nsString& aString) {
  nsStr::Initialize(*this,eTwoByte);
  nsStr::Assign(*this,aString,0,aString.mLength);
}

/**
 * construct from subsumeable string
 * @update  gess 1/4/99
 * @param   reference to a subsumeString
 */
#ifdef AIX
nsString::nsString(const nsSubsumeStr& aSubsumeStr)  {
  nsStr::Initialize(*this,eTwoByte);

  nsSubsumeStr temp(aSubsumeStr);  // a temp is needed for the AIX compiler
  Subsume(*this,temp);
#else
nsString::nsString(nsSubsumeStr& aSubsumeStr)  {
  nsStr::Initialize(*this,eTwoByte);

  Subsume(*this,aSubsumeStr);
#endif /* AIX */
}

/**
 * Destructor
 * Make sure we call nsStr::Destroy.
 */
nsString::~nsString() {
  nsStr::Destroy(*this);
}

void nsString::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const {
  if (aResult) {
    *aResult = sizeof(*this) + mCapacity * mCharSize;
  }
}

/**
 * This method truncates this string to given length.
 *
 * @update  gess 01/04/99
 * @param   anIndex -- new length of string
 * @return  nada
 */
void nsString::Truncate(PRInt32 anIndex) {
  nsStr::Truncate(*this,anIndex);
}

/**
 *  Determine whether or not the characters in this
 *  string are in sorted order.
 *  
 *  @update  gess 8/25/98
 *  @return  TRUE if ordered.
 */
PRBool nsString::IsOrdered(void) const {
  PRBool  result=PR_TRUE;
  if(mLength>1) {
    PRUint32 theIndex;
    PRUnichar c1=0;
    PRUnichar c2=GetCharAt(*this,0);
    for(theIndex=1;theIndex<mLength;theIndex++) {
      c1=c2;
      c2=GetCharAt(*this,theIndex);
      if(c1>c2) {
        result=PR_FALSE;
        break;
      }
    }
  }
  return result;
}


/**
 * Call this method if you want to force the string to a certain capacity
 * @update  gess 1/4/99
 * @param   aLength -- contains new length for mStr
 * @return
 */
void nsString::SetCapacity(PRUint32 aLength) {
  if(aLength>mCapacity) {
    GrowCapacity(*this,aLength);
  }
  AddNullTerminator(*this);
}

/**********************************************************************
  Accessor methods...
 *********************************************************************/


//static char gChar=0;

/** 
 * 
 * @update  gess1/4/99
 * @return  ptr to internal buffer (if 1-byte), otherwise NULL
 */
const char* nsString::GetBuffer(void) const {
  const char* result=(eOneByte==mCharSize) ? mStr : 0;
  return result;
}


/**
 * This method returns the internal unicode buffer. 
 * Now that we've factored the string class, this should never
 * be able to return a 1 byte string.
 *
 * @update  gess1/4/99
 * @return  ptr to internal (2-byte) buffer;
 */
const PRUnichar* nsString::GetUnicode(void)  const {
  const PRUnichar* result=(eOneByte==mCharSize) ? 0 : mUStr;
  return result;
}

/**
 * Get nth character.
 */
PRUnichar nsString::operator[](PRUint32 anIndex) const {
  return GetCharAt(*this,anIndex);
}

/**
 * Get nth character.
 */
PRUnichar nsString::CharAt(PRUint32 anIndex) const {
  return GetCharAt(*this,anIndex);
}

/**
 * Get 1st character.
 */
PRUnichar nsString::First(void) const{
  return GetCharAt(*this,0);
}

/**
 * Get last character.
 */
PRUnichar nsString::Last(void) const{
  return GetCharAt(*this,mLength-1);
}

/**
 * set a char inside this string at given index
 * @param aChar is the char you want to write into this string
 * @param anIndex is the ofs where you want to write the given char
 * @return TRUE if successful
 */
PRBool nsString::SetCharAt(PRUnichar aChar,PRUint32 anIndex){
  PRBool result=PR_FALSE;
  if(anIndex<mLength){
    if(eOneByte==mCharSize)
      mStr[anIndex]=char(aChar); 
    else mUStr[anIndex]=aChar;

// SOON!   if(0==aChar) mLength=anIndex;

    result=PR_TRUE;
  }
  return result;
}


/*********************************************************
  append (operator+) METHODS....
 *********************************************************/


/**
 * Create a new string by appending given string to this
 * @update  gess 01/04/99
 * @param   aString -- 2nd string to be appended
 * @return  new subsumeable string (this makes things faster by reducing copying)
 */
nsSubsumeStr nsString::operator+(const nsStr& aString){
  nsString temp(*this); //make a temp string the same size as this...
  nsStr::Append(temp,aString,0,aString.mLength);
  return nsSubsumeStr(temp);
}

/**
 * Create a new string by appending given string to this
 * @update  gess 01/04/99
 * @param   aString -- 2nd string to be appended
 * @return  new subsumeable string (this makes things faster by reducing copying)
 */
nsSubsumeStr nsString::operator+(const nsString& aString){
  nsString temp(*this); //make a temp string the same size as this...
  nsStr::Append(temp,aString,0,aString.mLength);
  return nsSubsumeStr(temp);
}

/**
 * create a new string by adding this to the given buffer.
 * @update  gess 01/04/99
 * @param   aCString is a ptr to cstring to be added to this
 * @return  new subsumeable string (this makes things faster by reducing copying)
 */
nsSubsumeStr nsString::operator+(const char* aCString) {
  nsString temp(*this);
  temp.Append(aCString); 
  return nsSubsumeStr(temp);
}


/**
 * create a new string by adding this to the given char.
 * @update  gess 01/04/99
 * @param   aChar is a char to be added to this
 * @return  new subsumeable string (this makes things faster by reducing copying)
 */
nsSubsumeStr nsString::operator+(char aChar) {
  nsString temp(*this);
  temp.Append(char(aChar));
  return nsSubsumeStr(temp);
}

/**
 * create a new string by adding this to the given buffer.
 * @update  gess 01/04/99
 * @param   aString is a ptr to unistring to be added to this
 * @return  new subsumeable string (this makes things faster by reducing copying)
 */
nsSubsumeStr nsString::operator+(const PRUnichar* aString) {
  nsString temp(*this);
  temp.Append(aString);
  return nsSubsumeStr(temp);
}


/**
 * create a new string by adding this to the given char.
 * @update  gess 01/04/99
 * @param   aChar is a unichar to be added to this
 * @return  new subsumeable string (this makes things faster by reducing copying)
 */
nsSubsumeStr nsString::operator+(PRUnichar aChar) {
  nsString temp(*this);
  temp.Append(char(aChar));
  return nsSubsumeStr(temp);
}

/**********************************************************************
  Lexomorphic transforms...
 *********************************************************************/

/**
 * Converts all chars in internal string to lower
 * @update  gess 01/04/99
 */
void nsString::ToLowerCase() {
  nsStr::ChangeCase(*this,PR_FALSE);
}

/**
 * Converts all chars in internal string to upper
 * @update  gess 01/04/99
 */
void nsString::ToUpperCase() {
  nsStr::ChangeCase(*this,PR_TRUE);
}

/**
 * Converts chars in this to uppercase, and
 * stores them in aString
 * @update  gess 01/04/99
 * @param   aOut is a string to contain result
 */
void nsString::ToLowerCase(nsString& aString) const {
  aString=*this;
  nsStr::ChangeCase(aString,PR_FALSE);
}

/**
 * Converts chars in this to uppercase, and
 * stores them in a given output string
 * @update  gess 01/04/99
 * @param   aOut is a string to contain result
 */
void nsString::ToUpperCase(nsString& aString) const {
  aString=*this;
  nsStr::ChangeCase(aString,PR_TRUE);
}

/**
 *  This method is used to remove all occurances of the
 *  characters found in aSet from this string.
 *  
 *  @update gess 11/02/99
 *  @param  aChar -- char to be stripped
 *  @param  anOffset -- where in this string to start stripping chars
 *  @return *this 
 */
nsString& nsString::StripChar(PRUnichar aChar,PRInt32 anOffset){
  
  anOffset=nsStr::FindChar(*this,aChar,PR_FALSE,anOffset);
  while(kNotFound<anOffset) {
    nsStr::Delete(*this,anOffset,1);
    anOffset=nsStr::FindChar(*this,aChar,PR_FALSE,anOffset);
  }
  return *this;
}

/**
 *  This method is used to remove all occurances of the
 *  characters found in aSet from this string.
 *  
 *  @update gess 01/04/99
 *  @param  aSet -- characters to be cut from this
 *  @return *this 
 */
nsString& nsString::StripChars(const char* aSet){
  nsStr::StripChars(*this,aSet);
  return *this;
}


/**
 *  This method strips whitespace throughout the string
 *  
 *  @update  gess 01/04/99
 *  @return  this
 */
nsString& nsString::StripWhitespace() {
  return StripChars(kWhitespace);
}

/**
 *  This method is used to replace all occurances of the
 *  given source char with the given dest char
 *  
 *  @param  
 *  @return *this 
 */
nsString& nsString::ReplaceChar(PRUnichar aSourceChar, PRUnichar aDestChar) {
  PRUint32 theIndex=0;
  if(eTwoByte==mCharSize){
    for(theIndex=0;theIndex<mLength;theIndex++){
      if(mUStr[theIndex]==aSourceChar) {
        mUStr[theIndex]=aDestChar;
      }//if
    }
  }
  else{
    for(theIndex=0;theIndex<mLength;theIndex++){
      if(mStr[theIndex]==(char)aSourceChar) {
        mStr[theIndex]=(char)aDestChar;
      }//if
    }
  }
  return *this;
}

/**
 *  This method is used to replace all occurances of the
 *  given source char with the given dest char
 *  
 *  @param  
 *  @return *this 
 */
nsString& nsString::ReplaceChar(const char* aSet, PRUnichar aNewChar){
  if(aSet){
    PRInt32 theIndex=FindCharInSet(aSet,0);
    while(kNotFound<theIndex) {
      if(eTwoByte==mCharSize) 
        mUStr[theIndex]=aNewChar;
      else mStr[theIndex]=(char)aNewChar;
      theIndex=FindCharInSet(aSet,theIndex+1);
    }
  }
  return *this;
}

/**
 *  This method is used to replace all occurances of the
 *  given target with the given replacement
 *  
 *  @param  
 *  @return *this 
 */
nsString& nsString::ReplaceSubstring(const PRUnichar* aTarget,const PRUnichar* aNewValue){
  if(aTarget && aNewValue) {

    PRInt32 len=nsCRT::strlen(aTarget);
    if(0<len) {
      CBufDescriptor theDesc1(aTarget,PR_TRUE, len+1,len);
      nsAutoString theTarget(theDesc1);

      len=nsCRT::strlen(aNewValue);
      if(0<len) {
        CBufDescriptor theDesc2(aNewValue,PR_TRUE, len+1,len);
        nsAutoString theNewValue(theDesc2);

        ReplaceSubstring(theTarget,theNewValue);
      }
    }
  }
  return *this;}

/**
 *  This method is used to replace all occurances of the
 *  given target substring with the given replacement substring
 *  
 *  @param aTarget
 *  @param aNewValue
 *  @return *this 
 */
nsString& nsString::ReplaceSubstring(const nsString& aTarget,const nsString& aNewValue){


  //WARNING: This is not working yet!!!!!

  if(aTarget.mLength && aNewValue.mLength) {
    PRBool isSameLen=(aTarget.mLength==aNewValue.mLength);

    if((isSameLen) && (1==aNewValue.mLength)) {
      ReplaceChar(aTarget.CharAt(0),aNewValue.CharAt(0));
    }
    else {
      PRInt32 theIndex=0;
      while(kNotFound!=(theIndex=nsStr::FindSubstr(*this,aTarget,PR_FALSE,theIndex))) {
        if(aNewValue.mLength<aTarget.mLength) {
          //Since target is longer than newValue, we should delete a few chars first, then overwrite.
          PRInt32 theDelLen=aTarget.mLength-aNewValue.mLength;
          nsStr::Delete(*this,theIndex,theDelLen);
        }
        else {
          //this is the worst case: the newvalue is larger than the substr it's replacing
          //so we have to insert some characters...
          PRInt32 theInsLen=aNewValue.mLength-aTarget.mLength;
          nsStr::Insert(*this,theIndex,aNewValue,0,theInsLen);
        }
        nsStr::Overwrite(*this,aNewValue,theIndex);
      }
    }
  }
  return *this;
}

/**
 *  This method is used to replace all occurances of the
 *  given source char with the given dest char
 *  
 *  @param  
 *  @return *this 
 */
PRInt32 nsString::CountChar(PRUnichar aChar) {
  PRInt32 theIndex=0;
  PRInt32 theCount=0;
  PRInt32 theLen=(PRInt32)mLength;
  for(theIndex=0;theIndex<theLen;theIndex++){
    PRUnichar theChar=GetCharAt(*this,theIndex);
    if(theChar==aChar)
      theCount++;
  }
  return theCount;
}

/**
 *  This method trims characters found in aTrimSet from
 *  either end of the underlying string.
 *  
 *  @update  gess 3/31/98
 *  @param   aTrimSet -- contains chars to be trimmed from
 *           both ends
 *  @return  this
 */
nsString& nsString::Trim(const char* aTrimSet, PRBool aEliminateLeading,PRBool aEliminateTrailing){
  if(aTrimSet){
    nsStr::Trim(*this,aTrimSet,aEliminateLeading,aEliminateTrailing);
  }

  return *this;
}

/**
 *  This method strips chars in given set from string.
 *  You can control whether chars are yanked from
 *  start and end of string as well.
 *  
 *  @update  gess 3/31/98
 *  @param   aEliminateLeading controls stripping of leading ws
 *  @param   aEliminateTrailing controls stripping of trailing ws
 *  @return  this
 */
nsString& nsString::CompressSet(const char* aSet, PRUnichar aChar,PRBool aEliminateLeading,PRBool aEliminateTrailing){
  if(aSet){
    ReplaceChar(aSet,aChar);
    nsStr::CompressSet(*this,aSet,aEliminateLeading,aEliminateTrailing);
  }



  return *this;
}

/**
 *  This method strips whitespace from string.
 *  You can control whether whitespace is yanked from
 *  start and end of string as well.
 *  
 *  @update  gess 3/31/98
 *  @param   aEliminateLeading controls stripping of leading ws
 *  @param   aEliminateTrailing controls stripping of trailing ws
 *  @return  this
 */
nsString& nsString::CompressWhitespace( PRBool aEliminateLeading,PRBool aEliminateTrailing){
  CompressSet(kWhitespace,' ',aEliminateLeading,aEliminateTrailing);

  return *this;
}

/**********************************************************************
  string conversion methods...
 *********************************************************************/

/**
 * Creates a duplicate clone (ptr) of this string.
 * @update  gess 01/04/99
 * @return  ptr to clone of this string
 */
nsString* nsString::ToNewString() const {
  return new nsString(*this);
}

/**
 * Creates an ascii clone of this string
 * Note that calls to this method should be matched with calls to Recycle().
 * @update  gess 01/04/99
 * @return  ptr to new ascii string
 */
char* nsString::ToNewCString() const {
  nsCString temp(*this);
  temp.SetCapacity(8); //ensure that we get an allocated buffer instead of the common empty one.
  char* result=temp.mStr;
  temp.mStr=0;
  temp.mOwnsBuffer=PR_FALSE;

#ifdef RICKG_DEBUG
//  fstream& theStream=GetLogStream();
//  theStream << "tonewcString() " << result << endl;
#endif
  
  return result;
}
/**
 * Creates an UTF8 clone of this string
 * Note that calls to this method should be matched with calls to Recycle().
 * @update  ftang 09/10/99
 * @return  ptr to new UTF8 string
 * http://www.cis.ohio-state.edu/htbin/rfc/rfc2279.html
 */
char* nsString::ToNewUTF8String() const {
  nsCString temp(*this);
  temp.SetCapacity(8); //ensure that we get an allocated buffer instead of the common empty one.

  // Caculate how many bytes we need
  PRUnichar* p;
  PRInt32 utf8len;
  for(p = this->mUStr, utf8len=0; 0 != (*p);p++)
  {
     if(0x0000 == ((*p) & 0x007F))
        utf8len += 1; // 0000 0000 - 0000 007F
     else if(0x0000 == ((*p) & 0x07FF))
        utf8len += 2; // 0000 0080 - 0000 07FF
     else 
        utf8len += 3; // 0000 0800 - 0000 FFFF
     // Note: Surrogate pair need 4 bytes, but in this caculation
     // we count as 6 bytes. It will wast 2 bytes per surrogate pair
  }

  if((utf8len+1) > 8)
     temp.SetCapacity(utf8len+1); 

  char* result=temp.mStr;
  char* out = result;
  PRUint32 ucs4=0;

  for(p = this->mUStr, utf8len=0; 0 != (*p);p++)
  {
     if(0 == ucs4) {
       if(0x0000 == ((*p) & 0xFF80)) {
          *out++ = (char)*p;
       } else if(0x0000 == ((*p) & 0xF800)) {
          *out++ = 0xC0 | (char)((*p) >> 6);
          *out++ = 0x80 | (char)(0x003F & (*p));
       } else {
          if( 0xD800 == ( 0xFC00 & (*p))) 
          { // D800- DBFF - High Surrogate 
            // N = (H- D800) *400 + 10000 + ...
            ucs4 = 0x10000 | ((0x03FF & (*p)) << 10);
          } else if( 0xDC00 == ( 0xFC00 & (*p))) { 
            // DC00- DFFF - Low Surrogate 
            // error here. We should hit High Surrogate first
            // Do not output any thing in this case
          } else {
            *out++ = 0xE0 | (char)((*p) >> 12);
            *out++ = 0x80 | (char)(0x003F & (*p >> 6));
            *out++ = 0x80 | (char)(0x003F & (*p) );
          }
       }
     } else {
       if( 0xDC00 == (0xFC00 & (*p))) { 
         // DC00- DFFF - Low Surrogate 
         // N += ( L - DC00 )  
         ucs4 |= (0x03FF & (*p));
         // 0001 0000-001F FFFF
         *out++ = 0xF0 | (char)(ucs4 >> 18);
         *out++ = 0x80 | (char)(0x003F & (ucs4 >> 12));
         *out++ = 0x80 | (char)(0x003F & (ucs4 >> 6));
         *out++ = 0x80 | (char)(0x003F & ucs4) ;
       } else {
         // Got a High Surrogate but no low surrogate
         // output nothing.
       }
       ucs4 = 0;
     }
  }
  *out = '\0'; // null terminate
  temp.mStr=0;
  temp.mOwnsBuffer=PR_FALSE;
  
  return result;
}

/**
 * Creates an ascii clone of this string
 * Note that calls to this method should be matched with calls to Recycle().
 * @update  gess 01/04/99
 * @return  ptr to new ascii string
 */
PRUnichar* nsString::ToNewUnicode() const {
  PRUnichar* result=0;
  if(eOneByte==mCharSize) {
    nsString temp(mStr);
    temp.SetCapacity(8);
    result=temp.mUStr;
    temp.mStr=0;
    temp.mOwnsBuffer=PR_FALSE;
  }
  else{
    nsString temp(mUStr);
    temp.SetCapacity(8);
    result=temp.mUStr;
    temp.mStr=0;
    temp.mOwnsBuffer=PR_FALSE;
  }
  return result;
}

/**
 * Copies contents of this string into he given buffer
 * Note that if you provide me a buffer that is smaller than the length of
 * this string, only the number of bytes that will fit are copied. 
 *
 * @update  gess 01/04/99
 * @param   aBuf
 * @param   aBufLength -- size of your external buffer (including null)
 * @param   anOffset -- THIS IS NOT USED AT THIS TIME!
 * @return
 */
char* nsString::ToCString(char* aBuf, PRUint32 aBufLength,PRUint32 anOffset) const{
  if(aBuf) {

    // NS_ASSERTION(mLength<=aBufLength,"buffer smaller than string");

    CBufDescriptor theDescr(aBuf,PR_TRUE,aBufLength,0);
    nsCAutoString temp(theDescr);
    temp.Assign(*this,aBufLength-1);
    temp.mStr=0;
  }
  return aBuf;
}

/**
 * Perform string to float conversion.
 * @update  gess 01/04/99
 * @param   aErrorCode will contain error if one occurs
 * @return  float rep of string value
 */
float nsString::ToFloat(PRInt32* aErrorCode) const {
  char buf[100];
  if (mLength > PRInt32(sizeof(buf)-1)) {
    *aErrorCode = (PRInt32) NS_ERROR_ILLEGAL_VALUE;
    return 0.0f;
  }
  char* cp = ToCString(buf, sizeof(buf));
  float f = (float) PR_strtod(cp, &cp);
  if (*cp != 0) {
    *aErrorCode = (PRInt32) NS_ERROR_ILLEGAL_VALUE;
  }
  *aErrorCode = (PRInt32) NS_OK;
  return f;
}

/**
 * Perform numeric string to int conversion with given radix.
 * NOTE: 1. This method mandates that the string is well formed.
 *       2. This method will return an error if the string you give
            contains chars outside the range for the specified radix.

 * @update  gess 10/01/98
 * @param   aErrorCode will contain error if one occurs
 * @param   aRadix tells us what base to expect the string in.
 * @return  int rep of string value
 */
static PRInt32 _ToInteger(nsCString& aString,PRInt32* anErrorCode,PRUint32 aRadix) {

  //copy chars to local buffer -- step down from 2 bytes to 1 if necessary...
  PRInt32 result=0;

  char*   cp = aString.mStr + aString.mLength;
  PRInt32 theMult=1;

  *anErrorCode = NS_OK;

    //now iterate the numeric chars and build our result
  char theDigit=0;
  while(--cp>=aString.mStr){
    char theChar=*cp;
    if((theChar>='0') && (theChar<='9')){
      theDigit=theChar-'0';
    }
    else if((theChar>='A') && (theChar<='F')) {
      if(10==aRadix){
        *anErrorCode=NS_ERROR_ILLEGAL_VALUE;
        result=0;
        break;
      }
      theDigit=(theChar-'A')+10;
    }
    else if('-'==theChar) {
      result=-result;
      break;
    }
    else if(('+'==theChar) || (' '==theChar)) { //stop in a good state if you see this...
      break;
    }
    else {
      //we've encountered a char that's not a legal number or sign
      *anErrorCode=NS_ERROR_ILLEGAL_VALUE;
      result=0;
      break;
    }

    result+=theDigit*theMult;
    theMult*=aRadix;
  }
  return result;
}

/**
 * Call this method to extract the rightmost numeric value from the given 
 * 1-byte input string, and simultaneously determine the radix.
 * NOTE: This method mandates that the string is well formed.
 *       Leading and trailing gunk should be removed, and the case upper.
 * @update  gess 10/01/98
 * @param   anInputString contains orig string
 * @param   anOutString contains numeric portion copy of input string
 * @param   aRadix (an out parm) tells the caller what base we think the string is in.
 * @return  non-zero error code if this string is non-numeric
 */
static PRInt32 GetNumericSubstring(nsCString& aString,PRUint32& aRadix) {
  static const char* validChars="0123456789abcdefABCDEF-+#";

  const char* cp=aString.GetBuffer();
  PRInt32 result=NS_ERROR_ILLEGAL_VALUE;
  if(cp) {

    //begin by skipping over leading chars that shouldn't be part of the number...
    
    char* to=(char*)cp;
    const char* endcp=cp+aString.mLength;
    int   len=strlen(validChars);

    while(cp<endcp){
      const char* pos=(const char*)memchr(validChars,*cp,len);
      if(!pos) {
        cp++;
      }
      else break;
    }

    while(cp<endcp){
      char theChar=toupper(*cp);

      if((theChar>='0') && (theChar<='9')) {
        *to++=theChar;
      }
      else if((theChar>='A') && (theChar<='F')) {
        aRadix=16;
        *to++=theChar;
      }
      else if('X'==theChar){
        if('-'==aString.mStr[0])
          to=&aString.mStr[1];
        else to=aString.mStr;
        aRadix=16;
        //root=cp;
      }
      else if('-'==theChar) {
        *to++=theChar;
      }
      else if(('#'==theChar) || ('+'==theChar)){
        //just skip this char...
      }
      else break;
      cp++;
    }
    aString.Truncate(to-aString.mStr);
    result=(0==aString.mLength) ? NS_ERROR_ILLEGAL_VALUE : NS_OK;
  }
  return result;
}


/**
 * This method tries to autodetect that radix given a string
 * @update  gess 10/01/98
 * @return  10,16,or 0 (meaning I don't know)
 */
PRUint32 nsString::DetermineRadix(void) {
  PRUint32 result=kRadixUnknown;
  if(0<mLength) {
    nsCAutoString theString(*this);
    if(NS_OK!=GetNumericSubstring(theString,result))
      result=kRadixUnknown;
  }
  return result;
}


/**
 * Perform decimal numeric string to int conversion.
 * NOTE: In this version, we use the radix you give, even if it's wrong.
 * @update  gess 10/01/98
 * @param   aErrorCode will contain error if one occurs
 * @param   aRadix tells us what base to expect the given string in.
 * @return  int rep of string value
 */
PRInt32 nsString::ToInteger(PRInt32* anErrorCode,PRUint32 aRadix) const {

  //copy chars to local buffer -- step down from 2 bytes to 1 if necessary...
  PRInt32   result=0;
  nsCAutoString theString(*this);
  PRUint32  theRadix=aRadix;

  *anErrorCode=GetNumericSubstring(theString,theRadix); //we actually don't use this radix; use given radix instead
  if(NS_OK==*anErrorCode){
    if(kAutoDetect==aRadix)
      aRadix=theRadix;
    if((kRadix10==aRadix) || (kRadix16==aRadix))
      result=_ToInteger(theString,anErrorCode,aRadix); //note we use the given radix, not the computed one.
    else *anErrorCode=NS_ERROR_ILLEGAL_VALUE;
  }
  return result;
}

/**********************************************************************
  String manipulation methods...                
 *********************************************************************/


/**
 * assign given nsStr (or derivative) to this one
 * @update  gess 01/04/99
 * @param   aString: nsStr to be appended
 * @return  this
 */
nsString& nsString::Assign(const nsStr& aString,PRInt32 aCount) {
  if(this!=&aString){
    nsStr::Truncate(*this,0);

    if(aCount<0)
      aCount=aString.mLength;
    else aCount=MinInt(aCount,aString.mLength);

    nsStr::Assign(*this,aString,0,aCount);
  }
  return *this;
}


/**
 * assign given char* to this string
 * @update  gess 01/04/99
 * @param   aCString: buffer to be assigned to this 
 * @param   aCount -- length of given buffer or -1 if you want me to compute length.
 * NOTE:    IFF you pass -1 as aCount, then your buffer must be null terminated.
 *
 * @return  this
 */
nsString& nsString::Assign(const char* aCString,PRInt32 aCount) {
  nsStr::Truncate(*this,0);
  if(aCString){
    Append(aCString,aCount);
  }
  return *this;
}

/**
 * assign given unichar* to this string
 * @update  gess 01/04/99
 * @param   aString: buffer to be assigned to this 
 * @param   aCount -- length of given buffer or -1 if you want me to compute length.
 * NOTE:    IFF you pass -1 as aCount, then your buffer must be null terminated.
 *
 * @return  this
 */
nsString& nsString::Assign(const PRUnichar* aString,PRInt32 aCount) {
  nsStr::Truncate(*this,0);
  if(aString){
    Append(aString,aCount);
  }
  return *this;
}

/**
 * assign given char to this string
 * @update  gess 01/04/99
 * @param   aChar: char to be assignd to this
 * @return  this
 */
nsString& nsString::Assign(char aChar) {
  nsStr::Truncate(*this,0);
  return Append(aChar);
}

/**
 * assign given unichar to this string
 * @update  gess 01/04/99
 * @param   aChar: char to be assignd to this
 * @return  this
 */
nsString& nsString::Assign(PRUnichar aChar) {
  nsStr::Truncate(*this,0);
  return Append(aChar);
}

/**
 * WARNING! THIS IS A VERY SPECIAL METHOD. 
 * This method "steals" the contents of aSource and hands it to aDest.
 * Ordinarily a copy is made, but not in this version.
 * @update  gess10/30/98
 * @param 
 * @return
 */
#ifdef AIX
nsString& nsString::operator=(const nsSubsumeStr& aSubsumeString) {
  nsSubsumeStr temp(aSubsumeString);  // a temp is needed for the AIX compiler
  Subsume(*this,temp);
#else
  nsString& nsString::operator=(nsSubsumeStr& aSubsumeString) {
  Subsume(*this,aSubsumeString);
#endif // AIX
  return *this;
}


/**
 * append given string to this string; 
 * @update  gess 01/04/99
 * @param   aString : string to be appended to this
 * @return  this
 */
nsString& nsString::Append(const nsStr& aString,PRInt32 aCount) {

  if(aCount<0)
    aCount=aString.mLength;
  else aCount=MinInt(aCount,aString.mLength);

  if(0<aCount)
    nsStr::Append(*this,aString,0,aCount);
  return *this;
}


/**
 * append given string to this string
 * I don't think we need this method now that we have the previous one.
 * @update  gess 01/04/99
 * @param   aString : string to be appended to this
 * @return  this
 */
nsString& nsString::Append(const nsString& aString,PRInt32 aCount) {
  if(aCount<0)
    aCount=aString.mLength;
  else aCount=MinInt(aCount,aString.mLength);
  if(0<aCount)
    nsStr::Append(*this,aString,0,aCount);
  return *this;
}

/**
 * append given c-string to this string
 * @update  gess 01/04/99
 * @param   aString : string to be appended to this
 * @param   aCount -- length of given buffer or -1 if you want me to compute length.
 * NOTE:    IFF you pass -1 as aCount, then your buffer must be null terminated.
 *
 * @return  this
 */
nsString& nsString::Append(const char* aCString,PRInt32 aCount) {
  if(aCString && aCount){  //if astring is null or count==0 there's nothing to do
    nsStr temp;
    Initialize(temp,eOneByte);
    temp.mStr=(char*)aCString;

    if(0<aCount) {
      temp.mLength=aCount;

      // If this assertion fires, the caller is probably lying about the length of
      //   the passed-in string.  File a bug on the caller.

#ifdef NS_DEBUG
      PRInt32 len=nsStr::FindChar(temp,0,PR_FALSE,0);
      NS_WARN_IF_FALSE(kNotFound==len,"possible embedded null in append(char*)");
#endif

    }
    else aCount=temp.mLength=nsCRT::strlen(aCString);
      
    if(0<aCount)
      nsStr::Append(*this,temp,0,aCount);
  }
  return *this;
}

/**
 * append given unicode string to this 
 * @update  gess 01/04/99
 * @param   aString : string to be appended to this
 * @param   aCount -- length of given buffer or -1 if you want me to compute length.
 * NOTE:    IFF you pass -1 as aCount, then your buffer must be null terminated.
 *
 * @return  this
 */
nsString& nsString::Append(const PRUnichar* aString,PRInt32 aCount) {
  if(aString && aCount){  //if astring is null or count==0 there's nothing to do
    nsStr temp;
    Initialize(temp,eTwoByte);
    temp.mUStr=(PRUnichar*)aString;

    if(0<aCount) {
      temp.mLength=aCount;

      // If this assertion fires, the caller is probably lying about the length of
      //   the passed-in string.  File a bug on the caller.
#ifdef NS_DEBUG
      PRInt32 len=nsStr::FindChar(temp,0,PR_FALSE,0);
      NS_WARN_IF_FALSE(kNotFound==len,"possible embedded null in append(PRUnichar*)");
#endif

    }
    else aCount=temp.mLength=nsCRT::strlen(aString);
      
    if(0<aCount)
      nsStr::Append(*this,temp,0,aCount);
  }
  return *this;
}

/**
 * append given char to this string
 * @update  gess 01/04/99
 * @param   aChar: char to be appended 
 * @return  this
 */
nsString& nsString::Append(char aChar) {
  char buf[2]={0,0};
  buf[0]=aChar;

  nsStr temp;
  Initialize(temp,eOneByte);
  temp.mStr=buf;
  temp.mLength=1;
  nsStr::Append(*this,temp,0,1);
  return *this;
}

/**
 * append given unichar to this string
 * @update  gess 01/04/99
 * @param   aChar: char to be appended to this
 * @return  this
 */
nsString& nsString::Append(PRUnichar aChar) {
  PRUnichar buf[2]={0,0};
  buf[0]=aChar;

  nsStr temp;
  Initialize(temp,eTwoByte);
  temp.mUStr=buf;
  temp.mLength=1;
  nsStr::Append(*this,temp,0,1);
  return *this;
}

/**
 * Append the given integer to this string 
 * @update  gess 01/04/99
 * @param   aInteger:
 * @param   aRadix:
 * @return
 */
nsString& nsString::Append(PRInt32 anInteger,PRInt32 aRadix) {

  PRUint32 theInt=(PRUint32)anInteger;

  char buf[]={'0',0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

  PRInt32 radices[] = {1000000000,268435456};
  PRInt32 mask1=radices[16==aRadix];

  PRInt32 charpos=0;
  if(anInteger<0) {
    theInt*=-1;
    if(10==aRadix) {
      buf[charpos++]='-';
    }
    else theInt=(int)~(theInt-1);
  }

  PRBool isfirst=PR_TRUE;
  while(mask1>=1) {
    PRInt32 theDiv=theInt/mask1;
    if((theDiv) || (!isfirst)) {
      buf[charpos++]="0123456789abcdef"[theDiv];
      isfirst=PR_FALSE;
    }
    theInt-=theDiv*mask1;
    mask1/=aRadix;
  }
  return Append(buf);
}


/**
 * Append the given float to this string 
 * @update  gess 01/04/99
 * @param   aFloat:
 * @return
 */
nsString& nsString::Append(float aFloat){
  char buf[40];
  // *** XX UNCOMMENT THIS LINE
  //PR_snprintf(buf, sizeof(buf), "%g", aFloat);
  sprintf(buf,"%g",aFloat);
  Append(buf);
  return *this;
}


/*
 *  Copies n characters from this left of this string to given string,
 *  
 *  @update  gess 4/1/98
 *  @param   aDest -- Receiving string
 *  @param   aCount -- number of chars to copy
 *  @return  number of chars copied
 */
PRUint32 nsString::Left(nsString& aDest,PRInt32 aCount) const{

  if(aCount<0)
    aCount=mLength;
  else aCount=MinInt(aCount,mLength);
  nsStr::Assign(aDest,*this,0,aCount);

  return aDest.mLength;
}

/*
 *  Copies n characters from this string to from given offset
 *  
 *  @update  gess 4/1/98
 *  @param   aDest -- Receiving string
 *  @param   anOffset -- where copying should begin
 *  @param   aCount -- number of chars to copy
 *  @return  number of chars copied
 */
PRUint32 nsString::Mid(nsString& aDest,PRUint32 anOffset,PRInt32 aCount) const{
  if(aCount<0)
    aCount=mLength;
  else aCount=MinInt(aCount,mLength);
  nsStr::Assign(aDest,*this,anOffset,aCount);

  return aDest.mLength;
}

/*
 *  Copies last n characters from this string to given string,
 *  
 *  @update gess 4/1/98
 *  @param  aDest -- Receiving string
 *  @param  aCount -- number of chars to copy
 *  @return number of chars copied
 */
PRUint32 nsString::Right(nsString& aDest,PRInt32 aCount) const{
  PRInt32 offset=MaxInt(mLength-aCount,0);
  return Mid(aDest,offset,aCount);
}


/*
 *  This method inserts n chars from given string into this
 *  string at str[anOffset].
 *  
 *  @update gess 4/1/98
 *  @param  aString -- source String to be inserted into this
 *  @param  anOffset -- insertion position within this str
 *  @param  aCount -- number of chars to be copied from aCopy
 *  @return this
 */
nsString& nsString::Insert(const nsString& aCopy,PRUint32 anOffset,PRInt32 aCount) {
  nsStr::Insert(*this,anOffset,aCopy,0,aCount);
  return *this;
}

/**
 * Insert a char* into this string at a specified offset.
 *
 * @update  gess4/22/98
 * @param   char* aCString to be inserted into this string
 * @param   anOffset is insert pos in str 
 * @param   aCount -- length of given buffer or -1 if you want me to compute length.
 * NOTE:    IFF you pass -1 as aCount, then your buffer must be null terminated.
 *
 * @return  this
 */
nsString& nsString::Insert(const char* aCString,PRUint32 anOffset,PRInt32 aCount){
  if(aCString && aCount){
    nsStr temp;
    nsStr::Initialize(temp,eOneByte);
    temp.mStr=(char*)aCString;

    if(0<aCount) {
      temp.mLength=aCount;

      // If this assertion fires, the caller is probably lying about the length of
      //   the passed-in string.  File a bug on the caller.
#ifdef NS_DEBUG
      PRInt32 len=nsStr::FindChar(temp,0,PR_FALSE,0);
      NS_WARN_IF_FALSE(kNotFound==len,"possible embedded null in Insert(char*)");
#endif

    }
    else aCount=temp.mLength=nsCRT::strlen(aCString);

    if(0<aCount){
      nsStr::Insert(*this,anOffset,temp,0,aCount);
    }
  }
  return *this;  
}


/**
 * Insert a unicode* into this string at a specified offset.
 *
 * @update  gess4/22/98
 * @param   aChar char to be inserted into this string
 * @param   anOffset is insert pos in str 
 * @param   aCount -- length of given buffer or -1 if you want me to compute length.
 * NOTE:    IFF you pass -1 as aCount, then your buffer must be null terminated.
 *
 * @return  this
 */
nsString& nsString::Insert(const PRUnichar* aString,PRUint32 anOffset,PRInt32 aCount){
  if(aString && aCount){
    nsStr temp;
    nsStr::Initialize(temp,eTwoByte);
    temp.mUStr=(PRUnichar*)aString;

    if(0<aCount) {
      temp.mLength=aCount;

      // If this assertion fires, the caller is probably lying about the length of
      //   the passed-in string.  File a bug on the caller.
#ifdef NS_DEBUG
      PRInt32 len=nsStr::FindChar(temp,0,PR_FALSE,0);
      NS_WARN_IF_FALSE(kNotFound==len,"possible embedded null in Insert(PRUnichar*)");
#endif

    }
    else aCount=temp.mLength=nsCRT::strlen(aString);

    if(0<aCount){
      nsStr::Insert(*this,anOffset,temp,0,aCount);
    }
  }
  return *this;  
}


/**
 * Insert a single uni-char into this string at
 * a specified offset.
 *
 * @update  gess4/22/98
 * @param   aChar char to be inserted into this string
 * @param   anOffset is insert pos in str 
 * @return  this
 */
nsString& nsString::Insert(PRUnichar aChar,PRUint32 anOffset){
  PRUnichar theBuffer[2]={0,0};
  theBuffer[0]=aChar;
  nsStr temp;
  nsStr::Initialize(temp,eTwoByte);
  temp.mUStr=theBuffer;
  temp.mLength=1;
  nsStr::Insert(*this,anOffset,temp,0,1);
  return *this;
}

/*
 *  This method is used to cut characters in this string
 *  starting at anOffset, continuing for aCount chars.
 *  
 *  @update gess 01/04/99
 *  @param  anOffset -- start pos for cut operation
 *  @param  aCount -- number of chars to be cut
 *  @return *this
 */
nsString& nsString::Cut(PRUint32 anOffset, PRInt32 aCount) {
  if(0<aCount) {
    nsStr::Delete(*this,anOffset,aCount);
  }
  return *this;
}

/**********************************************************************
  Searching methods...                
 *********************************************************************/
 
/**
 *  Search for given character within this string.
 *  This method does so by using a binary search,
 *  so your string HAD BETTER BE ORDERED!
 *  
 *  @param   aChar is the unicode char to be found
 *  @return  offset in string, or -1 (kNotFound)
 */
PRInt32 nsString::BinarySearch(PRUnichar aChar) const{
  PRInt32 low=0;
  PRInt32 high=mLength-1;

  while (low <= high) {
    int middle = (low + high) >> 1;
    PRUnichar theChar=GetCharAt(*this,middle);
    if (theChar==aChar)
      return middle;
    if (theChar>aChar)
      high = middle - 1; 
    else
      low = middle + 1; 
  }
  return kNotFound;
}

/**
 *  Search for given cstr within this string
 *  
 *  @update  gess 3/25/98
 *  @param   aCString - substr to be found
 *  @return  offset in string, or -1 (kNotFound)
 */
PRInt32 nsString::Find(const char* aCString,PRBool aIgnoreCase,PRInt32 anOffset) const{
  NS_ASSERTION(0!=aCString,kNullPointerError);

  PRInt32 result=kNotFound;
  if(aCString) {
    nsStr temp;
    nsStr::Initialize(temp,eOneByte);
    temp.mLength=nsCRT::strlen(aCString);
    temp.mStr=(char*)aCString;
    result=nsStr::FindSubstr(*this,temp,aIgnoreCase,anOffset);
  }
  return result;
}

/**
 *  Search for given unichar* within this string
 *  
 *  @update  gess 3/25/98
 *  @param   aString - substr to be found
 *  @return  offset in string, or -1 (kNotFound)
 */
PRInt32 nsString::Find(const PRUnichar* aString,PRBool aIgnoreCase,PRInt32 anOffset) const{
  NS_ASSERTION(0!=aString,kNullPointerError);

  PRInt32 result=kNotFound;
  if(aString) {
    nsStr temp;
    nsStr::Initialize(temp,eTwoByte);
    temp.mLength=nsCRT::strlen(aString);
    temp.mUStr=(PRUnichar*)aString;
    result=nsStr::FindSubstr(*this,temp,aIgnoreCase,anOffset);
  }
  return result;
}

/**
 *  Search for given nsSTr within this string
 *  
 *  @update  gess 3/25/98
 *  @param   aString - substr to be found
 *  @return  offset in string, or -1 (kNotFound)
 */
PRInt32 nsString::Find(const nsStr& aString,PRBool aIgnoreCase,PRInt32 anOffset) const{
  PRInt32 result=nsStr::FindSubstr(*this,aString,aIgnoreCase,anOffset);
  return result;
}

/**
 *  Search for given string within this string
 *  
 *  @update  gess 3/25/98
 *  @param   aString - substr to be found
 *  @return  offset in string, or -1 (kNotFound)
 */
PRInt32 nsString::Find(const nsString& aString,PRBool aIgnoreCase,PRInt32 anOffset) const{
  PRInt32 result=nsStr::FindSubstr(*this,aString,aIgnoreCase,anOffset);
  return result;
}

/**
 *  Search for a given char, starting at given offset
 *  
 *  @update  gess 3/25/98
 *  @param   aChar
 *  @return  offset of found char, or -1 (kNotFound)
 */
#if 0
PRInt32 nsString::Find(PRUnichar aChar,PRInt32 anOffset,PRBool aIgnoreCase) const{
  PRInt32 result=nsStr::FindChar(*this,aChar,aIgnoreCase,anOffset);
  return result;
}
#endif

/**
 *  Search for a given char, starting at given offset
 *  
 *  @update  gess 3/25/98
 *  @param   aChar is the unichar to be sought
 *  @param   anOffset
 *  @param   aIgnoreCase
 *  @return  offset of found char, or -1 (kNotFound)
 */
PRInt32 nsString::FindChar(PRUnichar aChar,PRBool aIgnoreCase,PRInt32 anOffset) const{
  PRInt32 result=nsStr::FindChar(*this,aChar,aIgnoreCase,anOffset);
  return result;
}

/**
 *  This method finds the offset of the first char in this string that is
 *  a member of the given charset, starting the search at anOffset
 *  
 *  @update  gess 3/25/98
 *  @param   aCStringSet
 *  @param   anOffset -- where in this string to start searching
 *  @return  
 */
PRInt32 nsString::FindCharInSet(const char* aCStringSet,PRInt32 anOffset) const{
  NS_ASSERTION(0!=aCStringSet,kNullPointerError);

  PRInt32 result=kNotFound;
  if(aCStringSet) {
    nsStr temp;
    nsStr::Initialize(temp,eOneByte);
    temp.mLength=nsCRT::strlen(aCStringSet);
    temp.mStr=(char*)aCStringSet;
    result=nsStr::FindCharInSet(*this,temp,PR_FALSE,anOffset);
  }
  return result;
}

/**
 *  This method finds the offset of the first char in this string that is
 *  a member of the given charset, starting the search at anOffset
 *  
 *  @update  gess 3/25/98
 *  @param   aCStringSet
 *  @param   anOffset -- where in this string to start searching
 *  @return  
 */
PRInt32 nsString::FindCharInSet(const PRUnichar* aStringSet,PRInt32 anOffset) const{
  NS_ASSERTION(0!=aStringSet,kNullPointerError);

  PRInt32 result=kNotFound;
  if(aStringSet) {
    nsStr temp;
    nsStr::Initialize(temp,eTwoByte);
    temp.mLength=nsCRT::strlen(aStringSet);
    temp.mStr=(char*)aStringSet;
    result=nsStr::FindCharInSet(*this,temp,PR_FALSE,anOffset);
  }
  return result;
}

/**
 *  This method finds the offset of the first char in this string that is
 *  a member of the given charset, starting the search at anOffset
 *  
 *  @update  gess 3/25/98
 *  @param   aCStringSet
 *  @param   anOffset -- where in this string to start searching
 *  @return  
 */
PRInt32 nsString::FindCharInSet(const nsStr& aSet,PRInt32 anOffset) const{
  PRInt32 result=nsStr::FindCharInSet(*this,aSet,PR_FALSE,anOffset);
  return result;
}


/**
 *  
 *  
 *  @update  gess 3/25/98
 *  @param   
 *  @return  
 */
PRInt32 nsString::RFind(const nsStr& aString,PRBool aIgnoreCase,PRInt32 anOffset) const{
  PRInt32 result=nsStr::RFindSubstr(*this,aString,aIgnoreCase,anOffset);
  return result;
}

/**
 *  Reverse search for substring
 *  
 *  @update  gess 3/25/98
 *  @param   aString
 *  @param   aIgnoreCase
 *  @param   anOffset - tells us where to begin the search
 *  @return  offset of substring or -1
 */
PRInt32 nsString::RFind(const nsString& aString,PRBool aIgnoreCase,PRInt32 anOffset) const{
  PRInt32 result=nsStr::RFindSubstr(*this,aString,aIgnoreCase,anOffset);
  return result;
}

/**
 *  Reverse search for substring
 *  
 *  @update  gess 3/25/98
 *  @param   aString
 *  @param   aIgnoreCase
 *  @param   anOffset - tells us where to begin the search
 *  @return  offset of substring or -1
 */
PRInt32 nsString::RFind(const char* aString,PRBool aIgnoreCase,PRInt32 anOffset) const{
  NS_ASSERTION(0!=aString,kNullPointerError);

  PRInt32 result=kNotFound;
  if(aString) {
    nsStr temp;
    nsStr::Initialize(temp,eOneByte);
    temp.mLength=nsCRT::strlen(aString);
    temp.mStr=(char*)aString;
    result=nsStr::RFindSubstr(*this,temp,aIgnoreCase,anOffset);
  }
  return result;
}


/**
 *  Reverse search for char
 *  
 *  @update  gess 3/25/98
 *  @param   achar
 *  @param   aIgnoreCase
 *  @param   anOffset - tells us where to begin the search
 *  @return  offset of substring or -1
 */
#if 0
PRInt32 nsString::RFind(PRUnichar aChar,PRInt32 anOffset,PRBool aIgnoreCase) const{
  PRInt32 result=nsStr::RFindChar(*this,aChar,aIgnoreCase,anOffset);
  return result;
}
#endif
 
/**
 *  Reverse search for a given char, starting at given offset
 *  
 *  @update  gess 3/25/98
 *  @param   aChar
 *  @param   aIgnoreCase
 *  @param   anOffset
 *  @return  offset of found char, or -1 (kNotFound)
 */
PRInt32 nsString::RFindChar(PRUnichar aChar,PRBool aIgnoreCase,PRInt32 anOffset) const{
  PRInt32 result=nsStr::RFindChar(*this,aChar,aIgnoreCase,anOffset);
  return result;
}

/**
 *  Reverse search for char in this string that is also a member of given charset
 *  
 *  @update  gess 3/25/98
 *  @param   aCStringSet
 *  @param   anOffset
 *  @return  offset of found char, or -1 (kNotFound)
 */
PRInt32 nsString::RFindCharInSet(const char* aCStringSet,PRInt32 anOffset) const{
  NS_ASSERTION(0!=aCStringSet,kNullPointerError);

  PRInt32 result=kNotFound;
  if(aCStringSet) {
    nsStr temp;
    nsStr::Initialize(temp,eOneByte);
    temp.mLength=nsCRT::strlen(aCStringSet);
    temp.mStr=(char*)aCStringSet;
    result=nsStr::RFindCharInSet(*this,temp,PR_FALSE,anOffset);
  }
  return result;
}

/**
 *  Reverse search for a first char in this string that is a
 *  member of the given char set
 *  
 *  @update  gess 3/25/98
 *  @param   aSet
 *  @param   aIgnoreCase
 *  @param   anOffset
 *  @return  offset of found char, or -1 (kNotFound)
 */
PRInt32 nsString::RFindCharInSet(const nsStr& aSet,PRInt32 anOffset) const{
  PRInt32 result=nsStr::RFindCharInSet(*this,aSet,PR_FALSE,anOffset);
  return result;
}

/**
 *  Reverse search for a first char in this string that is a
 *  member of the given char set
 *  
 *  @update  gess 3/25/98
 *  @param   aSet
 *  @param   aIgnoreCase
 *  @param   anOffset
 *  @return  offset of found char, or -1 (kNotFound)
 */
PRInt32 nsString::RFindCharInSet(const PRUnichar* aStringSet,PRInt32 anOffset) const{
  NS_ASSERTION(0!=aStringSet,kNullPointerError);

  PRInt32 result=kNotFound;
  if(aStringSet) {
    nsStr temp;
    nsStr::Initialize(temp,eTwoByte);
    temp.mLength=nsCRT::strlen(aStringSet);
    temp.mUStr=(PRUnichar*)aStringSet;
    result=nsStr::RFindCharInSet(*this,temp,PR_FALSE,anOffset);
  }
  return result;
}


/**************************************************************
  COMPARISON METHODS...
 **************************************************************/

/**
 * Compares given cstring to this string. 
 * @update  gess 01/04/99
 * @param   aCString pts to a cstring
 * @param   aIgnoreCase tells us how to treat case
 * @param   aCount tells us how many chars to test; -1 implies full length
 * @return  -1,0,1
 */
PRInt32 nsString::Compare(const nsString& aString,PRBool aIgnoreCase,PRInt32 aCount) const {
  PRInt32 result=nsStr::Compare(*this,aString,aCount,aIgnoreCase);
  return result;
}

/**
 * Compares given cstring to this string. 
 * @update  gess 01/04/99
 * @param   aCString pts to a cstring
 * @param   aIgnoreCase tells us how to treat case
 * @param   aCount tells us how many chars to test; -1 implies full length
 * @return  -1,0,1
 */
PRInt32 nsString::Compare(const char *aCString,PRBool aIgnoreCase,PRInt32 aCount) const {
  NS_ASSERTION(0!=aCString,kNullPointerError);

  if(aCString) {
    nsStr temp;
    nsStr::Initialize(temp,eOneByte);

    temp.mLength= (0<aCount) ? aCount : nsCRT::strlen(aCString);

    temp.mStr=(char*)aCString;
    return nsStr::Compare(*this,temp,aCount,aIgnoreCase);
  }

  return 0;
}

/**
 * Compares given unistring to this string. 
 * @update  gess 01/04/99
 * @param   aString pts to a uni-string
 * @param   aIgnoreCase tells us how to treat case
 * @param   aCount tells us how many chars to test; -1 implies full length
 * @return  -1,0,1
 */
PRInt32 nsString::Compare(const PRUnichar* aString,PRBool aIgnoreCase,PRInt32 aCount) const {
  NS_ASSERTION(0!=aString,kNullPointerError);

  if(aString) {
    nsStr temp;
    nsStr::Initialize(temp,eTwoByte);
    temp.mLength=nsCRT::strlen(aString);
    temp.mUStr=(PRUnichar*)aString;
    return nsStr::Compare(*this,temp,aCount,aIgnoreCase);
  }

   return 0;
}

/**
 * Compare given nsStr with this cstring.
 * 
 * @param   aString is an nsStr instance to be compared
 * @param   aIgnoreCase tells us how to treat case
 * @param   aCount tells us how many chars to test; -1 implies full length
 * @return  -1,0,1
 */
PRInt32 nsString::Compare(const nsStr& aString,PRBool aIgnoreCase,PRInt32 aCount) const {
  return nsStr::Compare(*this,aString,aCount,aIgnoreCase);
}

/**
 *  Here come a whole bunch of operator functions that are self-explanatory...
 */

PRBool nsString::operator==(const nsString& S) const {return Equals(S);}      
PRBool nsString::operator==(const nsStr& S) const {return Equals(S);}      
PRBool nsString::operator==(const char* s) const {return Equals(s);}
PRBool nsString::operator==(const PRUnichar* s) const {return Equals(s);}

PRBool nsString::operator!=(const nsString& S) const {return PRBool(Compare(S)!=0);}
PRBool nsString::operator!=(const nsStr& S) const {return PRBool(Compare(S)!=0);}
PRBool nsString::operator!=(const char* s) const {return PRBool(Compare(s)!=0);}
PRBool nsString::operator!=(const PRUnichar* s) const {return PRBool(Compare(s)!=0);}

PRBool nsString::operator<(const nsString& S) const {return PRBool(Compare(S)<0);}
PRBool nsString::operator<(const nsStr& S) const {return PRBool(Compare(S)<0);}
PRBool nsString::operator<(const char* s) const {return PRBool(Compare(s)<0);}
PRBool nsString::operator<(const PRUnichar* s) const {return PRBool(Compare(s)<0);}

PRBool nsString::operator>(const nsString& S) const {return PRBool(Compare(S)>0);}
PRBool nsString::operator>(const nsStr& S) const {return PRBool(Compare(S)>0);}
PRBool nsString::operator>(const char* s) const {return PRBool(Compare(s)>0);}
PRBool nsString::operator>(const PRUnichar* s) const {return PRBool(Compare(s)>0);}

PRBool nsString::operator<=(const nsString& S) const {return PRBool(Compare(S)<=0);}
PRBool nsString::operator<=(const nsStr& S) const {return PRBool(Compare(S)<=0);}
PRBool nsString::operator<=(const char* s) const {return PRBool(Compare(s)<=0);}
PRBool nsString::operator<=(const PRUnichar* s) const {return PRBool(Compare(s)<=0);}

PRBool nsString::operator>=(const nsString& S) const {return PRBool(Compare(S)>=0);}
PRBool nsString::operator>=(const nsStr& S) const {return PRBool(Compare(S)>=0);}
PRBool nsString::operator>=(const char* s) const {return PRBool(Compare(s)>=0);}
PRBool nsString::operator>=(const PRUnichar* s) const {return PRBool(Compare(s)>=0);}


PRBool nsString::EqualsIgnoreCase(const nsString& aString) const {
  return Equals(aString,PR_TRUE);
}

PRBool nsString::EqualsIgnoreCase(const char* aString,PRInt32 aLength) const {
  return Equals(aString,PR_TRUE,aLength);
}

PRBool nsString::EqualsIgnoreCase(/*FIX: const */nsIAtom *aAtom) const {
  return Equals(aAtom,PR_TRUE);
}

PRBool nsString::EqualsIgnoreCase(const PRUnichar* s1, const PRUnichar* s2) const {
  return Equals(s1,s2,PR_TRUE);
}


/**
 * Compare this to given string; note that we compare full strings here.
 * 
 * @update gess 01/04/99
 * @param  aString is the other nsString to be compared to
 * @param   aCount tells us how many chars to test; -1 implies full length
 * @return TRUE if equal
 */
PRBool nsString::Equals(const nsString& aString,PRBool aIgnoreCase,PRInt32 aCount) const {
  PRInt32 theAnswer=nsStr::Compare(*this,aString,aCount,aIgnoreCase);
  PRBool  result=PRBool(0==theAnswer);
  return result;

}

/**
 * Compare this to given string; note that we compare full strings here.
 * 
 * @update gess 01/04/99
 * @param  aString is the other nsString to be compared to
 * @param   aCount tells us how many chars to test; -1 implies full length
 * @return TRUE if equal
 */
PRBool nsString::Equals(const nsStr& aString,PRBool aIgnoreCase,PRInt32 aCount) const {
  PRInt32 theAnswer=nsStr::Compare(*this,aString,aCount,aIgnoreCase);
  PRBool  result=PRBool(0==theAnswer);
  return result;
}

/**
 * Compare this to given c-string; note that we compare full strings here.
 *
 * @param  aString is the CString to be compared 
 * @param  aIgnorecase tells us whether to be case sensitive
 * @param   aCount tells us how many chars to test; -1 implies full length
 * @return TRUE if equal
 */
PRBool nsString::Equals(const char* aString,PRBool aIgnoreCase,PRInt32 aCount) const {
  PRInt32 theAnswer=Compare(aString,aIgnoreCase,aCount);
  PRBool  result=PRBool(0==theAnswer);
  return result;
}

/**
 * Compare this to given unicode string; note that we compare full strings here.
 *
 * @param  aString is the U-String to be compared 
 * @param  aIgnorecase tells us whether to be case sensitive
 * @param   aCount tells us how many chars to test; -1 implies full length
 * @return TRUE if equal
 */
PRBool nsString::Equals(const PRUnichar* aString,PRBool aIgnoreCase,PRInt32 aCount) const {
  PRInt32 theAnswer=Compare(aString,aIgnoreCase,aCount);
  PRBool  result=PRBool(0==theAnswer);
  return result;
}

/**
 * Compare this to given atom; note that we compare full strings here.
 * The optional length argument just lets us know how long the given string is.
 * If you provide a length, it is compared to length of this string as an
 * optimization.
 * 
 * @update gess 01/04/99
 * @param  aString -- unistring to compare to this
 * @param  aLength -- length of given string.
 * @return TRUE if equal
 */
PRBool nsString::Equals(/*FIX: const */nsIAtom* aAtom,PRBool aIgnoreCase) const{
  NS_ASSERTION(0!=aAtom,kNullPointerError);
  PRBool result=PR_FALSE;
  if(aAtom){
    PRInt32 cmp=0;
    const PRUnichar* unicode;
    if (aAtom->GetUnicode(&unicode) != NS_OK || unicode == nsnull)
        return PR_FALSE;
    if (aIgnoreCase)
      cmp=nsCRT::strcasecmp(mUStr,unicode);
    else
      cmp=nsCRT::strcmp(mUStr,unicode);
    result=PRBool(0==cmp);
  }

   return result;
}

/**
 * Compare given strings
 * @update gess 7/27/98
 * @param  s1 -- first unichar string to be compared
 * @param  s2 -- second unichar string to be compared
 * @return TRUE if equal
 */
PRBool nsString::Equals(const PRUnichar* s1, const PRUnichar* s2,PRBool aIgnoreCase) const {
  NS_ASSERTION(0!=s1,kNullPointerError);
  NS_ASSERTION(0!=s2,kNullPointerError);
  PRBool  result=PR_FALSE;
  if((s1) && (s2)){
    PRInt32 cmp=(aIgnoreCase) ? nsCRT::strcasecmp(s1,s2) : nsCRT::strcmp(s1,s2);
    result=PRBool(0==cmp);
  }

   return result;
}

/**
 *  Determine if given char in valid alpha range
 *  
 *  @update  gess 3/31/98
 *  @param   aChar is character to be tested
 *  @return  TRUE if in alpha range
 */
PRBool nsString::IsAlpha(PRUnichar aChar) {
  // XXX i18n
  if (((aChar >= 'A') && (aChar <= 'Z')) || ((aChar >= 'a') && (aChar <= 'z'))) {
    return PR_TRUE;
  }
  return PR_FALSE;
}

/**
 *  Determine if given char is a valid space character
 *  
 *  @update  gess 3/31/98
 *  @param   aChar is character to be tested
 *  @return  TRUE if is valid space char
 */
PRBool nsString::IsSpace(PRUnichar aChar) {
  // XXX i18n
  if ((aChar == ' ') || (aChar == '\r') || (aChar == '\n') || (aChar == '\t')) {
    return PR_TRUE;
  }
  return PR_FALSE;
}

/**
 *  Determine if given buffer contains plain ascii
 *  
 *  @param   aBuffer -- if null, then we test *this, otherwise we test given buffer
 *  @return  TRUE if is all ascii chars, or if strlen==0
 */
PRBool nsString::IsASCII(const PRUnichar* aBuffer) {

  if(!aBuffer) {
    aBuffer=mUStr;
    if(eOneByte==mCharSize)
      return PR_TRUE;
  }
  if(aBuffer) {
    while(*aBuffer) {
      if(*aBuffer>255){
        return PR_FALSE;        
      }
      aBuffer++;
    }
  }
  return PR_TRUE;
}


/**
 *  Determine if given char is valid digit
 *  
 *  @update  gess 3/31/98
 *  @param   aChar is character to be tested
 *  @return  TRUE if char is a valid digit
 */
PRBool nsString::IsDigit(PRUnichar aChar) {
  // XXX i18n
  return PRBool((aChar >= '0') && (aChar <= '9'));
}

#ifndef RICKG_TESTBED
/**************************************************************
  Define the string deallocator class...
 **************************************************************/
class nsStringDeallocator: public nsDequeFunctor{
public:
  virtual void* operator()(void* anObject) {
    nsString* aString= (nsString*)anObject;
    if(aString){
      delete aString;
    }
    return 0;
  }
};

/****************************************************************************
 * This class, appropriately enough, creates and recycles nsString objects..
 ****************************************************************************/

class nsStringRecycler {
public:
  nsStringRecycler() : mDeque(0) {
  }

  ~nsStringRecycler() {
    nsStringDeallocator theDeallocator;
    mDeque.ForEach(theDeallocator); //now delete the strings
  }

  void Recycle(nsString* aString) {
    mDeque.Push(aString);
  }

  nsString* CreateString(void){
    nsString* result=(nsString*)mDeque.Pop();
    if(!result)
      result=new nsString();
    return result;
  }
  nsDeque mDeque;
};
static nsStringRecycler& GetRecycler(void);

/**
 * 
 * @update  gess 01/04/99
 * @param 
 * @return
 */
nsStringRecycler& GetRecycler(void){
  static nsStringRecycler gRecycler;
  return gRecycler;
}
#endif


/**
 * Call this mehod when you're done 
 * @update  gess 01/04/99
 * @param 
 * @return
 */
nsString* nsString::CreateString(void){
  nsString* result=0;
#ifndef RICKG_TESTBED
  GetRecycler().CreateString();
#endif
  return result;
}

/**
 * Call this mehod when you're done 
 * @update  gess 01/04/99
 * @param 
 * @return
 */
void nsString::Recycle(nsString* aString){
#ifndef RICKG_TESTBED
  GetRecycler().Recycle(aString);
#else
  delete aString;
#endif
}

#if 0

/**
 * 
 * @update  gess8/8/98
 * @param 
 * @return
 */
ostream& operator<<(ostream& aStream,const nsString& aString){
  if(eOneByte==aString.mCharSize) {
    aStream<<aString.mStr;
  }
  else{
    PRUint32        theOffset=0;
    const PRUint32  theBufSize=300;
    char            theBuf[theBufSize+1];
    PRUint32        theCount=0;
    PRUint32        theRemains=0;

    while(theOffset<aString.mLength){
      theRemains=aString.mLength-theOffset;
      theCount=(theRemains<theBufSize) ? theRemains : theBufSize;
      aString.ToCString(theBuf,theCount+1,theOffset);
      theBuf[theCount]=0;
      aStream<<theBuf;
      theOffset+=theCount;
    }
  }    
  return aStream;
}
#endif


/**
 * 
 * @update  gess 01/04/99
 * @param 
 * @return
 */
NS_COM int fputs(const nsString& aString, FILE* out)
{
  char buf[100];
  char* cp = buf;
  PRInt32 len = aString.mLength;
  if (len >= PRInt32(sizeof(buf))) {
    cp = aString.ToNewCString();
  } else {
    aString.ToCString(cp, len + 1);
  }
  if(len>0)
    ::fwrite(cp, 1, len, out);
  if (cp != buf) {
    delete[] cp;
  }
  return (int) len;
}
       
/**
 * Dumps the contents of the string to stdout
 * @update  gess 11/15/99
 */
void nsString::DebugDump(void) const {
  
  const char* theBuffer=mStr;
  nsCAutoString temp;

  if(eTwoByte==mCharSize) {    
    temp.Assign(*this);
    theBuffer=temp.GetBuffer();
  }

  if(theBuffer) {
    printf("\n%s",theBuffer);
  }
}
       


/***********************************************************************
  IMPLEMENTATION NOTES: AUTOSTRING...
 ***********************************************************************/


/**
 * Default constructor
 *
 */
nsAutoString::nsAutoString() : nsString() {
  nsStr::Initialize(*this,mBuffer,(sizeof(mBuffer)>>eTwoByte)-1,0,eTwoByte,PR_FALSE);
  AddNullTerminator(*this);
}

/**
 * Copy construct from ascii c-string
 * @param   aCString is a ptr to a 1-byte cstr
 * @param   aLength tells us how many chars to copy from aCString
 */
nsAutoString::nsAutoString(const char* aCString,PRInt32 aLength) : nsString() {
  nsStr::Initialize(*this,mBuffer,(sizeof(mBuffer)>>eTwoByte)-1,0,eTwoByte,PR_FALSE);
  AddNullTerminator(*this);
  Append(aCString,aLength);
}

/**
 * Copy construct from uni-string
 * @param   aString is a ptr to a unistr
 * @param   aLength tells us how many chars to copy from aString
 */
nsAutoString::nsAutoString(const PRUnichar* aString,PRInt32 aLength) : nsString() {
  nsStr::Initialize(*this,mBuffer,(sizeof(mBuffer)>>eTwoByte)-1,0,eTwoByte,PR_FALSE);
  AddNullTerminator(*this);
  Append(aString,aLength);
}

/**
 * constructor that uses external buffer
 * @param   aBuffer describes the external buffer
 */
nsAutoString::nsAutoString(const CBufDescriptor& aBuffer) : nsString() {
  if(!aBuffer.mBuffer) {
    nsStr::Initialize(*this,mBuffer,(sizeof(mBuffer)>>eTwoByte)-1,0,eTwoByte,PR_FALSE);
  }
  else {
    nsStr::Initialize(*this,aBuffer.mBuffer,aBuffer.mCapacity,aBuffer.mLength,aBuffer.mCharSize,!aBuffer.mStackBased);
  }
  if(!aBuffer.mIsConst)
    AddNullTerminator(*this);
}


/**
 * Copy construct from an nsStr
 * @param   
 */
nsAutoString::nsAutoString(const nsStr& aString) : nsString() {
  nsStr::Initialize(*this,mBuffer,(sizeof(mBuffer)>>eTwoByte)-1,0,eTwoByte,PR_FALSE);
  AddNullTerminator(*this);
  Append(aString);
}

/**
 * Default copy constructor
 */
nsAutoString::nsAutoString(const nsAutoString& aString) : nsString() {
  nsStr::Initialize(*this,mBuffer,(sizeof(mBuffer)>>eTwoByte)-1,0,eTwoByte,PR_FALSE);
  AddNullTerminator(*this);
  Append(aString);
}


/**
 * Copy construct from a unichar
 * @param   
 */
nsAutoString::nsAutoString(PRUnichar aChar) : nsString(){
  nsStr::Initialize(*this,mBuffer,(sizeof(mBuffer)>>eTwoByte)-1,0,eTwoByte,PR_FALSE);
  AddNullTerminator(*this);
  Append(aChar);
}

/**
 * construct from a subsumeable string
 * @update  gess 1/4/99
 * @param   reference to a subsumeString
 */
#ifdef AIX
nsAutoString::nsAutoString(const nsSubsumeStr& aSubsumeStr) :nsString() {
  nsSubsumeStr temp(aSubsumeStr);  // a temp is needed for the AIX compiler
  Subsume(*this,temp);
#else
nsAutoString::nsAutoString( nsSubsumeStr& aSubsumeStr) :nsString() {
  Subsume(*this,aSubsumeStr);
#endif // AIX
}

/**
 * deconstruct the autstring
 * @param   
 */
nsAutoString::~nsAutoString(){
}

void nsAutoString::SizeOf(nsISizeOfHandler* aHandler, PRUint32* aResult) const {
  if (aResult) {
    *aResult = sizeof(*this) + mCapacity * mCharSize;
  }
}

nsSubsumeStr::nsSubsumeStr(nsStr& aString) : nsString() {
  Subsume(*this,aString);
}

nsSubsumeStr::nsSubsumeStr(PRUnichar* aString,PRBool assumeOwnership,PRInt32 aLength) : nsString() {
  mUStr=aString;
  mCapacity=mLength=(-1==aLength) ? nsCRT::strlen(aString) : aLength;
  mOwnsBuffer=assumeOwnership;
}
 
nsSubsumeStr::nsSubsumeStr(char* aString,PRBool assumeOwnership,PRInt32 aLength) : nsString() {
  mStr=aString;
  mCharSize=eOneByte;
  mCapacity=mLength=(-1==aLength) ? strlen(aString) : aLength;
  mOwnsBuffer=assumeOwnership;
}