src/systemc/ext/dt/fx/scfx_string.hh

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  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
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  with this work for additional information regarding copyright ownership.
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  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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/*****************************************************************************

  scfx_string.h -

  Original Author: Robert Graulich, Synopsys, Inc.
                   Martin Janssen,  Synopsys, Inc.

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

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

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date:
  Description of Modification:

 *****************************************************************************/
// $Log: scfx_string.h,v $
// Revision 1.1.1.1  2006/12/15 20:20:04  acg
// SystemC 2.3
//
// Revision 1.2  2006/01/03 23:18:34  acg
// Changed copyright to include 2006.
//
// Revision 1.1.1.1  2005/12/19 23:16:43  acg
// First check in of SystemC 2.1 into its own archive.
//
// Revision 1.9  2005/09/15 23:02:03  acg
// Added std:: prefix to appropriate methods and types to get around
// issues with the Edison Front End.
//
// Revision 1.8  2005/06/07 17:27:02  acg
// Fixed bug in scfx_string::operator += where an array reference was used
// rather than the [] operator.  This meant that the buffer may have been
// accessed beyond its allocated storage.
//

#ifndef __SYSTEMC_EXT_DT_FX_SCFX_STRING_HH__
#define __SYSTEMC_EXT_DT_FX_SCFX_STRING_HH__

#include <cstdio>

namespace sc_dt
{

// classes defined in this module
class scfx_string;


// ----------------------------------------------------------------------------
//  CLASS : scfx_string
//
//  Simple string class for internal use.
// ----------------------------------------------------------------------------

class scfx_string
{
    void resize(std::size_t);

  public:
    scfx_string();

    ~scfx_string();

    int length() const;

    void clear();

    char & operator [] (int);

    void append(int);
    void discard(int);
    void remove(int);

    void operator += (char);
    void operator += (const char *);

    operator const char * ();

  private:
    std::size_t m_len;
    std::size_t m_alloc;
    char *m_buffer;
};


// IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

inline void
scfx_string::resize(std::size_t i)
{
    do {
        m_alloc *= 2;
    } while (i >= m_alloc);

    char *temp = new char[m_alloc];

    for (int j = 0; j < (int) m_len; ++j) {
        temp[j] = m_buffer[j];
    }
    temp[m_len] = 0;

    delete [] m_buffer;
    m_buffer = temp;
}

inline scfx_string::scfx_string() :
        m_len(0), m_alloc(BUFSIZ), m_buffer(new char[m_alloc])
{
    m_buffer[m_len] = 0;
}

inline scfx_string::~scfx_string() { delete [] m_buffer; }

inline int scfx_string::length() const { return m_len; }

inline void
scfx_string::clear()
{
    m_len = 0;
    m_buffer[m_len] = 0;
}

inline char &
scfx_string::operator [] (int i)
{
    if (i >= (int)m_alloc) {
        resize(i);
    }
    return m_buffer[i];
}

inline void
scfx_string::append(int n)
{
    m_len += n;
    m_buffer[m_len] = 0;
}

inline void
scfx_string::discard(int n)
{
    m_len -= n;
    m_buffer[m_len] = 0;
}

inline void
scfx_string::remove(int i)
{
    for (int j = i + 1; j < (int)m_len; ++j)
        m_buffer[j - 1] = m_buffer[j];
    --m_len;
    m_buffer[m_len] = 0;
}

inline void
scfx_string::operator += (char c)
{
    this->operator [] (m_len) = c;
    m_len++;
    this->operator [] (m_len) = 0;
}

inline void
scfx_string::operator += (const char *s)
{
    while (*s)
        (*this) += *s++;
}

inline scfx_string::operator const char * ()
{
    m_buffer[m_len] = 0;
    return m_buffer;
}

} // namespace sc_dt

#endif // __SYSTEMC_EXT_DT_FX_SCFX_STRING_HH__