ASCII <-> UTF has trivial mappings. Avoid wcrtomb() and mbrtowc().
ISO-8859-1 is all narrow characters, and cheap to test for. It might
be possible to cheaply test other popular UTF blocks and/or planes as
well.
These two changes get 2-3x faster input processing on Linux and
FreeBSD. Performance improvement in actual usage is more modest but
still significant.
* Reduce the size of Terminal::Cell.
* Change colors and attributes in Terminal::Rendition to bitfields/bitmask.
* Change Cells to use UTF-8 strings instead of vector<wchar_t>. Store Rows in a vector instead of a deque.
* Add various Framebuffer::append() methods for more efficient passing of single and repeated characters.
* Change title/icon strings from deques to a vector typedef-- this is more for tidiness than any real performance.
* Fix inefficient STL use around Parser::UTF8Parser.
* Reduce typeid() usage, change some of it to a virtual method
* Do multiple-line scrolls as a single move
This commit is somewhat subtle; it informs Coverity that
Parser::Transition only holds an Action* temporarily, and should never
create/delete one. I believe runtime checkers should also understand
this OK.
Signed-off-by: John Hood <cgull@glup.org>
size_t is unsigned. Fixes two issues found by the Coverity Scan
service, one about the dead code and one about the std::string
exception being uncaught by mosh-server.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
John Hood