This is analogous to string.hpp's strlen, strcpy, strcat, which use C++
polymorphism rather than function name decorations for char/wchar_t
flavors.
Signed-off-by: Simon Rozman <simon@rozman.si>
The sgml.hpp is about converting between SGML and UTF-16/Unicode
actually. The "wstr" naming aligns better with std::wstring, wchar_t
etc.
Signed-off-by: Simon Rozman <simon@rozman.si>