mirror of https://github.com/bsnes-emu/bsnes.git
93 lines
2.0 KiB
C++
93 lines
2.0 KiB
C++
#ifdef NALL_STRING_INTERNAL_HPP
|
|
|
|
namespace nall {
|
|
|
|
string::string() : _data(nullptr), _refs(nullptr), _capacity(0), _size(0) {
|
|
}
|
|
|
|
auto string::pointer() -> char* {
|
|
static char _null[] = "";
|
|
if(!_data) return _null;
|
|
if(*_refs > 1) _data = _copy(); //make unique for write operations
|
|
return _data;
|
|
}
|
|
|
|
auto string::data() const -> const char* {
|
|
static const char _null[] = "";
|
|
if(!_data) return _null;
|
|
return _data;
|
|
}
|
|
|
|
auto string::reset() -> type& {
|
|
if(_data && !--*_refs) {
|
|
memory::free(_data);
|
|
_data = nullptr; //_refs = nullptr; is unnecessary
|
|
}
|
|
_capacity = 0;
|
|
_size = 0;
|
|
return *this;
|
|
}
|
|
|
|
auto string::reserve(unsigned capacity) -> type& {
|
|
if(capacity > _capacity) {
|
|
_capacity = bit::round(max(31u, capacity) + 1) - 1;
|
|
_data = _data ? _copy() : _allocate();
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
auto string::resize(unsigned size) -> type& {
|
|
reserve(size);
|
|
pointer()[_size = size] = 0;
|
|
return *this;
|
|
}
|
|
|
|
auto string::operator=(const string& source) -> string& {
|
|
if(&source == this) return *this;
|
|
reset();
|
|
if(source._data) {
|
|
_data = source._data;
|
|
_refs = source._refs;
|
|
_capacity = source._capacity;
|
|
_size = source._size;
|
|
++*_refs;
|
|
}
|
|
return *this;
|
|
}
|
|
|
|
auto string::operator=(string&& source) -> string& {
|
|
if(&source == this) return *this;
|
|
reset();
|
|
_data = source._data;
|
|
_refs = source._refs;
|
|
_capacity = source._capacity;
|
|
_size = source._size;
|
|
source._data = nullptr;
|
|
source._refs = nullptr;
|
|
source._capacity = 0;
|
|
source._size = 0;
|
|
return *this;
|
|
}
|
|
|
|
auto string::_allocate() -> char* {
|
|
auto _temp = (char*)memory::allocate(_capacity + 1 + sizeof(unsigned));
|
|
*_temp = 0;
|
|
_refs = (unsigned*)(_temp + _capacity + 1); //this will always be aligned by 32 via reserve()
|
|
*_refs = 1;
|
|
return _temp;
|
|
}
|
|
|
|
auto string::_copy() -> char* {
|
|
auto _temp = (char*)memory::allocate(_capacity + 1 + sizeof(unsigned));
|
|
memory::copy(_temp, _data, _size = min(_capacity, _size));
|
|
_temp[_size] = 0;
|
|
--*_refs;
|
|
_refs = (unsigned*)(_temp + _capacity + 1);
|
|
*_refs = 1;
|
|
return _temp;
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|