1 #include "mystring.h"

     2 

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

     4 mystring mystring::left(size_t offset) const

     5 {

     6   if(offset > rep->length)

     7     return *this;

     8   else

     9     return mystring(rep->buf, offset);

    10 }

    11 

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

    13 mystring mystring::right(size_t offset) const

    14 {

    15   if(offset >= rep->length)

    16     return mystring();

    17   else if(offset == 0)

    18     return *this;

    19   else

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

    21 }

    22 

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

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

    25 {

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

    27   if(len == 0)

    28     return mystring();

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

    30     return *this;

    31   else {

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

    33       len = rep->length - offset;

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

    35   }

    36 }

    37