#include "mystring.h"

mystring mystring::subst(char from, char to) const

{

  const unsigned length = rep->length;

  char buf[length+1];

  const char* in = rep->buf + length;

  bool changed = true;

  for(char* out = buf+length; out >= buf; in--, out--)

    if(*in == from)

      *out = to, changed = true;

    else

      *out = *in;

  if(!changed)

    return *this;

  else

    return mystring(buf, length);

}