DOOM 2 crashes upon interacting with level exit

[larb0b]

This port is very unstable when using a DOOM 2 IWAD. It seems to crash semi-often before actually drawing to the window, but if you do get in and manage to play, it crashes immediately upon interacting with a level exit.

WindowServer(11): [WM] WSWindow{0x01a32016} title set to "DOOM 2: Hell on Earth"
doom(23): printf_internal: Unimplemented format specifier .
USERSPACE(23) ASSERTION FAILED: false
/home/larbob/Projects/serenity/AK/PrintfImplementation.h:357 in int printf_internal(PutChFunc, char*, const char*&, va_list) [with PutChFunc = void (*)(char*&, char); va_list = char*]
signal: doom(23) sent 6 to doom(23)
terminate_due_to_signal doom(23) <- 6
Finalizing Thread 0 in doom(23)
0x0002f1d3  Scheduler::switch_now() +51
0x0002f677  Scheduler::yield() +69
0x00022f4b  Thread::block_helper() +27
0x0004eb78  Thread::BlockResult Thread::block<Thread::SemiPermanentBlocker, Thread::SemiPermanentBlocker::Reason>(Thread::SemiPermanentBlocker::Reason&&) +118
0x0001ba0b  Process::sys$kill(int, int) +189
0x00024cdf  syscall_trap_entry +545
0x00024a74  syscall_trap_handler +38
0x080a28ee  raise +22
0x080482bd  abort +13
0x080a2876  kill +0
0x0809f12a  vsnprintf +3463
0x0809f169  snprintf +24
0x08067cc7  WI_loadUnloadData +47
0x0806961e  WI_loadData +67
0x0806971e  WI_Start +19
0x0804e54f  G_DoCompleted +635
0x0804f2e9  G_Ticker +118
0x0804a9f9  TryRunTics +482
0x0804b132  D_DoomLoop +175
0x0804bf65  D_DoomMain +2440
0x08048492  main +349
0x080487b9  _start +94

Finalizing Process doom(23)
signal 17 was ignored by Shell(22)
Connection: Client disconnected: 4
WindowServer(11): Event type 3012 with no receiver :(
reap: doom(23) {Dead}
~Process{0x0033b2b8} name=doom pid=23, m_fds=0
~Thread{0x0033dd68}
sh: command finished in 68052 ms
/dev/pts/0 set_termios: ECHO=1, ISIG=1, ICANON=0
/dev/pts/0 set_termios: ECHOE=0, ECHOK=0, ECHONL=0
/dev/pts/0 set_termios: ISTRIP=0, ICRNL=0, INLCR=0, IGNCR=0
WindowServer(11): Event type 6 with no receiver :(

[awesomekling]

Looks like we're crashing because Serenity's printf implementation doesn't support . (dot) specifiers. Oops!