#include "mystring.h"

// return the sub-string ending at 'offset'

mystring mystring::left(size_t offset) const

{

  if(offset > rep->length)

    return *this;

  else

    return mystring(rep->buf, offset);

}

// return the sub-string starting at 'offset'

mystring mystring::right(size_t offset) const

{

  if(offset >= rep->length)

    return mystring();

  else if(offset == 0)

    return *this;

  else

    return mystring(rep->buf+offset, rep->length-offset);

}

// return the 'len' characters of the string starting at 'offset'

mystring mystring::sub(size_t offset, size_t len) const

{

  // return right(offset).left(len);

  if(len == 0)

    return mystring();

  else if(offset == 0 && len >= rep->length)

    return *this;

  else {

    if(len+offset >= rep->length)

      len = rep->length - offset;

    return mystring(rep->buf+offset, len);

  }

}