path NaiveUncomplete ( const path file, const path base )
{
if ( file.has_root_path() ) {
if ( file.root_path() != base.root_path() ) {
return file;
} else {
return NaiveUncomplete ( file.relative_path(), base.relative_path() );
}
} else {
if ( file.has_root_path() ) {
throw "cannot uncomplete a path relative path from a rooted base";
} else {
typedef path::const_iterator path_iterator;
path_iterator path_it = file.begin();
path_iterator base_it = base.begin();
while ( path_it != file.end() && base_it != base.end() ) {
if ( *path_it != *base_it ) {
break;
}
++path_it; ++base_it;
}
path result;
for ( ; base_it != base.end(); ++base_it ) {
result /= "..";
}
for ( ; path_it != file.end(); ++path_it ) {
result /= *path_it;
}
return result;
}
}
} // NaiveUncomplete
