varstr.cpp

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// $Id: varstr.cpp 1282 2006-06-09 09:46:49Z alex $
/* @@tag:xara-cn@@ DO NOT MODIFY THIS LINE
================================XARAHEADERSTART===========================
 
               Xara LX, a vector drawing and manipulation program.
                    Copyright (C) 1993-2006 Xara Group Ltd.
       Copyright on certain contributions may be held in joint with their
              respective authors. See AUTHORS file for details.

LICENSE TO USE AND MODIFY SOFTWARE
----------------------------------

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under the terms of the GNU General Public License version 2 as published
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-----------------

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=================================XARAHEADEREND============================
 */

#include "camtypes.h"
//#include "varstr.h" - in camtypes.h [AUTOMATICALLY REMOVED]


/**************************************************************************************
>   static BOOL StringVar::Init()

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    31st January 2006
    Inputs:-
    Outputs:    TRUE if this class initialises OK
                FALSE otherwise
    Purpose:    Test StringVar functionality in debug builds.
    Scope:      Public

***************************************************************************************/

BOOL StringVar::Init()
{
#if defined(_DEBUG) && 0
    StringVar t1(_T("Test string\n"));
    StringVar t2(_T("0123456789012345678901234567890123456789") // 8*40 = 320 chars
                _T("0123456789012345678901234567890123456789")
                _T("0123456789012345678901234567890123456789")
                _T("0123456789012345678901234567890123456789")
                _T("0123456789012345678901234567890123456789")
                _T("0123456789012345678901234567890123456789")
                _T("0123456789012345678901234567890123456789")
                _T("0123456789012345678901234567890123456789")
                );
    String_32 st32(_T(" Woohoo!\n"));

    StringVar t3;
    t3 = st32;
    t3 += t1;
    t3 += t2;
    TRACEUSER("Phil", _T("StringVar Test 1 = %s"), (TCHAR*)t3);

    StringVar t4(st32);
    StringVar t5(_R(IDS_MANY));
    t4 += TCHAR('-') + t5;      // Implicit cast?
    TRACEUSER("Phil", _T("StringVar Test 2 = %s\n"), (TCHAR*)t4);
#endif

    return TRUE;
}



/**************************************************************************************
>   StringVar::StringVar(const TCHAR* psz = 0)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30th January 2006
    Inputs:     An optional pointer to a (constant) Unicode character array - if
                omitted then the String becomes empty (NOT the null pointer).
    Purpose:    Constructs a string of the appropriate maximum length.
    Errors:     ASSERTion failure if the passed character array is too long for
                this length of string.
    Scope:      Public
***************************************************************************************/

StringVar::StringVar(const TCHAR* psz)
{
    text = NULL;
    length = 0;

    UINT32 newlen = camStrlen(psz);
    EnsureAlloc(newlen);
    SafeCopy(psz, newlen);
}



/**************************************************************************************
>   StringVar::StringVar(const StringBase& other)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30th January 2006
    Inputs:     An optional pointer to a (constant) Unicode character array - if
                omitted then the String becomes empty (NOT the null pointer).
    Purpose:    Constructs a string of the appropriate maximum length.
    Errors:     ASSERTion failure if the passed character array is too long for
                this length of string, or if psz is NULL.
    Scope:      Public
***************************************************************************************/

StringVar::StringVar(const StringBase& other)
{
    text = NULL;
    length = 0;

    UINT32 newlen = other.Length();
    EnsureAlloc(newlen);
    SafeCopy((const TCHAR*)other, newlen);
}



/**************************************************************************************
>   StringVar::StringVar(UINT32 resID, UINT32 hinst = 0)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30th January 2006
    Inputs:     An optional pointer to a (constant) Unicode character array - if
                omitted then the String becomes empty (NOT the null pointer).
    Purpose:    Constructs a string of the appropriate maximum length.
    Errors:     ASSERTion failure if the passed character array is too long for
                this length of string, or if psz is NULL.
    Scope:      Public
***************************************************************************************/

StringVar::StringVar(UINT32 resID, UINT32 hinst)
{
    text = NULL;
    length = 0;

    const TCHAR* pResText = CamResource::GetText(resID);
    UINT32 len = camStrlen(pResText);

    EnsureAlloc(len);
    SafeCopy(pResText, len);
}



/**************************************************************************************
>   StringVar::StringVar(const wxString& wxs)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    30th January 2006
    Inputs:     An optional pointer to a (constant) Unicode character array - if
                omitted then the String becomes empty (NOT the null pointer).
    Purpose:    Constructs a string of the appropriate maximum length.
    Errors:     ASSERTion failure if the passed character array is too long for
                this length of string, or if psz is NULL.
    Scope:      Public
***************************************************************************************/

StringVar::StringVar(const wxString& wxs)
{
    text = NULL;
    length = 0;

    UINT32 newlen = wxs.Len();
    EnsureAlloc(newlen);
    SafeCopy((const TCHAR*)wxs, newlen);
}



/**************************************************************************************
>   StringVar& StringVar::operator+=(const StringBase& rhs)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    31st January 2006
    Inputs:     The string to add to the end of this string.
    Returns:    A reference to the lhs, ie. this StringVar as an lvalue.
    Purpose:    Append string y onto the end of string x, eg.
                    x = TEXT("hello");
                    cout << (x += TEXT(" world!")) << endl;
***************************************************************************************/
inline StringVar& StringVar::operator+=(const StringBase& rhs)
{
    ERROR3IF(this==NULL, "StringVar this pointer is NULL!");
    ERROR3IF(text==NULL || (const TCHAR*)rhs==NULL, "Call to StringVar::operator+= for an unALLOCated String");

    if (text && (const TCHAR*)rhs)
        SafeCat((const TCHAR*)rhs);

    return *this;
}



/**************************************************************************************
>   StringVar& StringVar::operator+=(const TCHAR* s)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    31st January 2006
    Inputs:     The C-style character "string" to add to the end of this String.
    Returns:    A reference to the lhs, ie. this StringBase as an lvalue.
    Purpose:    Append string y onto the end of string x, eg.
                    x = TEXT("hello");
                    cout << (x += TEXT(" world!")) << endl;
***************************************************************************************/
inline StringVar& StringVar::operator+=(const TCHAR* s)
{
    ERROR3IF(this==NULL, "StringVar this pointer is NULL!");
    ERROR3IF(text==NULL || s==NULL, "Call to String::operator+= for an unALLOCated String");

    if (text && s)
        SafeCat(s);

    return *this;
}



/**************************************************************************************
>   StringVar& StringVar::operator+=(const TCHAR ch)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    31st January 2006
    Inputs:     A character to add to the end of this String.
    Returns:    A reference to the lhs, ie. this StringVar as an lvalue.
    Purpose:    Appends this character to the end of this string
***************************************************************************************/
StringVar& StringVar::operator+=(const TCHAR ch)
{
    ERROR3IF(this==NULL, "StringVar this pointer is NULL!");
    ERROR3IF(text==NULL, "Call to String::operator+= for an unALLOCated String");

    if (text && ch!=0)
    {
        TCHAR tch[2];
        tch[0] = ch;
        tch[1] = 0;
        SafeCat(tch);
    }   

    return *this;
}



/**************************************************************************************
>   StringVar& StringVar::operator=(const StringBase& rhs)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    1st February 2006
    Inputs:     A reference to a constant String.
    Returns:    A reference to this.
    Purpose:    Assignment (set equal to) operator, eg.
                    StringBase x("rhubarb");
                    x = "custard";
***************************************************************************************/
StringVar& StringVar::operator=(const StringBase& other)
{
    ERROR3IF(this==NULL, "StringVar this pointer is NULL!");
    ERROR3IF(text==NULL || (const TCHAR*)other==NULL, "Call to String::operator= for an unALLOCated String");

    if (text && (const TCHAR*)other)
    {
        UINT32 newlen = other.Length();
        EnsureAlloc(newlen);
        SafeCopy((const TCHAR*)other, newlen);
    }
    return *this;
}


    
/**************************************************************************************
>   StringVar& StringVar::operator=(const TCHAR* pcsz)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    1st February 2006
    Inputs:     A pointer to a constant C-style (possibly wide-character) string.
    Returns:    A reference to this.
    Purpose:    Assignment (set equal to) operator, eg.
                    StringBase x("rhubarb");
                    x = "custard";
***************************************************************************************/
StringVar& StringVar::operator=(const TCHAR* s)
{
    ERROR3IF(this==NULL, "StringVar this pointer is NULL!");
    ERROR3IF(text==NULL || s==NULL, "Call to String::operator= for an unALLOCated String or 0 char*");

    if (text && s)
    {
        UINT32 newlen = camStrlen(s);
        EnsureAlloc(newlen);
        SafeCopy(s, newlen);
    }

    return *this;
}

    
    
/**************************************************************************************
>   StringVar& StringVar::operator=(const TCHAR ch)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    1st February 2006
    Inputs:     ch - a single character
    Returns:    A reference to this.
    Purpose:    Assigns the single character to this string
***************************************************************************************/
inline StringVar& StringVar::operator=(const TCHAR ch)
{
    ERROR3IF(this==NULL, "StringVar this pointer is NULL!");
    ERROR3IF(text==NULL, "Call to String::operator= for an unALLOCated String");

    EnsureAlloc(1);
    if (text && length>=2)      // length includes term
    {
        text[0] = ch;
        text[1] = 0;
    }

    return *this;
}




/**************************************************************************************

>   void StringVar::SafeCat(const TCHAR* string)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    31st January 2006

    Inputs:     string      0-terminated source string
    Outputs:    -
    Returns:    -
    Purpose:    Appends string to the end of this
    SeeAlso:    StringBase::Alloc, StringVar::Alloc

***************************************************************************************/

void StringVar::SafeCat(const TCHAR* string)
{
    ERROR3IF(this==NULL || string==NULL, "StringBase::SafeCat given NULL params");
    if (string==NULL)
        return;

    // Are we going to overflow ?
    UINT32 newlen = camStrlen(text) + camStrlen(string);
    EnsureAlloc(newlen);

    // Now we can concatenate the specified string, if we allocated the buffer correcetly
    if (text && length>0 && (length-1) >= newlen)
        camStrcat(text, string);
}
    

    
/**************************************************************************************

>   void StringVar::SafeCopy(const TCHAR* string, UINT32 maxlen=0)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    1st February 2006

    Inputs:     string      0-terminated source string
    Outputs:    -
    Returns:    -
    Purpose:    Assigns string to this carefully avoiding buffer overflow

***************************************************************************************/

void StringVar::SafeCopy(const TCHAR* string, UINT32 maxlen)
{
    ERROR3IF(this==NULL || string==NULL, "StringBase::SafeCopy given NULL params");

    if (text!=NULL && length>0 && string!=NULL)
    {
        if (maxlen==0)
            maxlen = camStrlen(string);

        maxlen = ((length-1)<maxlen) ? length-1 : maxlen;       // length includes term

        camStrncpy(text, string, maxlen+1);     // Copy the string AND the terminating 0 character
    }
}
    

    
/**************************************************************************************

>   void StringVar::EnsureAlloc(UINT32 newlen)

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    31st January 2006

    Inputs:     string      0-terminated destination string
    Outputs:    -
    Returns:    -
    Purpose:    Appends string to the end of this
    SeeAlso:    StringBase::Alloc, StringVar::Alloc

***************************************************************************************/

void StringVar::EnsureAlloc(UINT32 newlen)
{
    // Note: length includes zero termination character
    if (length==0 || newlen > (length-1))       // length includes term
    {
        // We need to reallocate
        TCHAR* pOldText = text;
        text = NULL;

        // Allocate room for the new string plus extra room to avoid repeated reallocation
        // And round to a 64 char boundary so that allocations slot together more efficiently.
        // And ensure that we always allocate >0
        // (Remember Alloc adds 1 character for the terminator so we subtract 1 from newlen)
        newlen = (newlen/64 + 1)*64 - 1;
        Alloc(newlen);

        if (text!=NULL && pOldText!=NULL)
            camStrcpy(text, pOldText);
    }
}


#if !defined(EXCLUDE_FROM_XARLIB)
/**************************************************************************************
>   void StringVar::MakePercent(INT32 Value);
    void StringVar::MakePercent(double Value);
    void StringVar::MakePercent(TCHAR* Value);

    Author:     Phil_Martin (Xara Group Ltd) <camelotdev@xara.com>
    Created:    31st January 2006
    Inputs:     Takes a number / string
    Purpose:    Set the string equal to the given argument + a % character, or however
                the current locale wants it
    Example:    String_32 Str;
                Str.MakePercent(23);
                For UK, Str now equals "23%"
**************************************************************************************/

void StringVar::MakePercent(INT32 Value)
{   
    EnsureAlloc(32);
    StringBase::MakePercent(Value);
}

void StringVar::MakePercent(double Value)
{
    EnsureAlloc(32);
    StringBase::MakePercent(Value);
}

void StringVar::MakePercent(TCHAR* Value)
{
    EnsureAlloc(32);
    StringBase::MakePercent(Value);
}
#endif

---