# Primitives for screen control. # Require Linux and a modern terminal. == code enable-screen-grid-mode: # . prologue 55/push-ebp 89/<- %ebp 4/r32/esp # (flush Stdout) (flush Stderr) # switch to second screen buffer (write 1 Esc) (write 1 "[?1049h") # (clear-real-screen) $enable-screen-grid-mode:end: # . epilogue 89/<- %esp 5/r32/ebp 5d/pop-to-ebp c3/return enable-screen-type-mode: # . prologue 55/push-ebp 89/<- %ebp 4/r32/esp # switch to first screen buffer (write 1 Esc) (write 1 "[?1049l") $enable-screen-type-mode:end: # . epilogue 89/<- %esp 5/r32/ebp 5d/pop-to-ebp c3/return real-screen-size: # -> nrows/eax: int, ncols/ecx: int # . prologue 55/push-ebp 89/<- %ebp 4/r32/esp # . save registers 52/push-edx 53/push-ebx 56/push-esi 57/push-edi # (_maybe-open-terminal) # var window-size-info/esi: (addr winsize) # winsize is a type from the Linux kernel. We don't care how large it is. 81 5/subop/subtract %esp 0x40/imm32 89/<- %esi 4/r32/esp # ioctl(*Terminal-file-descriptor, TIOCGWINSZ, window-size-info) 89/<- %edx 6/r32/esi b9/copy-to-ecx 0x5413/imm32/TIOCGWINSZ 8b/-> *Terminal-file-descriptor 3/r32/ebx e8/call syscall_ioctl/disp32 # some bitworking to extract 2 16-bit shorts 8b/-> *esi 0/r32/eax 25/and-eax-with 0xffff/imm32 8b/-> *esi 1/r32/ecx c1/shift 5/subop/logical-right %ecx 0x10/imm8 $real-screen-size:end: # . reclaim locals 81 0/subop/add %esp 0x40/imm32 # . restore registers 5f/pop-to-edi 5e/pop-to-esi 5b/pop-to-ebx 5a/pop-to-edx # . epilogue 89/<- %esp 5/r32/ebp 5d/pop-to-ebp c3/return clear-real-screen: # . prologue 55/push-ebp 89/<- %ebp 4/r32/esp # (write 1 Esc) (write 1 "[H") (write 1 Esc) (write 1 "[2J") $clear-real-screen:end: # . epilogue 89/<- %esp 5/r32/ebp 5d/pop-to-ebp c3/return # row and col count from the top-left as (1, 1) move-cursor-on-real-screen: # row: int, column: int # . prologue 55/push-ebp 89/<- %ebp 4/r32/esp # . save registers 51/push-ecx # var buf/ecx: (stream byte 32) 81 5/subop/subtract %esp 0x20/imm32 68/push 0x20/imm32/size 68/push 0/imm32/read 68/push 0/imm32/write 89/<- %ecx 4/r32/esp # construct directive in buf (write %ecx Esc) (write %ecx "[") (write-int32-decimal %ecx *(ebp+8)) (write %ecx ";") (write-int32-decimal %ecx *(ebp+0xc)) (write %ecx "H") # flush (write-stream 2 %ecx) $move-cursor-on-real-screen:end: # . reclaim locals 81 0/subop/add %esp 0x2c/imm32 # . restore registers 59/pop-to-ecx # . epilogue 89/<- %esp 5/r32/ebp 5d/pop-to-ebp c3/return print-string-to-real-screen: # s: (addr array byte) # . prologue 55/push-ebp 89/<- %ebp 4/r32/esp # (write 1 *(ebp+8)) $print-string-to-real-screen:end: # . epilogue 89/<- %esp 5/r32/ebp 5d/pop-to-ebp c3/return print-slice-to-real-screen: # s: (addr slice) # . prologue 55/push-ebp 89/<- %ebp 4/r32/esp # (write-slice-buffered Stdout *(ebp+8)) (flush Stdout) $print-slice-to-real-screen:end: # . epilogue 89/<- %esp 5/r32/ebp 5d/pop-to-ebp c3/return print-stream-to-real-screen: # s: (addr stream byte) # . prologue 55/push-ebp 89/<- %ebp 4/r32/esp # (write-stream-data Stdout *(ebp+8)) (flush Stdout) $print-stream-to-real-screen:end: # . epilogue 89/<- %esp 5/r32/ebp 5d/pop-to-ebp c3/return # print a grapheme in utf-8 (only up to 4 bytes so far) print-grapheme-to-real-screen: # c: grapheme # . prologue 55/push-ebp 89/<- %ebp 4/r32/esp # . save registers 50/push-eax # var curr/eax: byte = 0 b8/copy-to-eax 0/imm32 # curr = *(ebp+8) 8a/byte-> *(ebp+8) 0/r32/al # if (curr == 0) return 3d/compare-eax-and 0/imm32 74/jump-if-= $print-gra

Fork of https://github.com/nsf/termbox as of 2015-06-05
git hash 252bef01264a2aeef22ebe5bae0b5893a58947f3

rminal: 81 7/subop/compare *Terminal-file-descriptor -1/imm32 75/jump-if-!= $_maybe-open-terminal:epilogue/disp8 # . save registers 50/push-eax 51/push-ecx 53/push-ebx # open("/dev/tty", O_RDWR) bb/copy-to-ebx Terminal-filename/imm32 b9/copy-to-ecx 2/imm32/O_RDWR e8/call syscall_open/disp32 89/<- *Terminal-file-descriptor 0/r32/eax $_maybe-open-terminal:end: # . restore registers 5b/pop-to-ebx 59/pop-to-ecx 58/pop-to-eax $_maybe-open-terminal:epilogue: c3/return == data Terminal-file-descriptor: # (addr int) -1/imm32 Esc: # (addr array byte) # size 1/imm32 # data 0x1b Terminal-filename: # (addr kernel-string) # "/dev/tty" 2f/slash 64/d 65/e 76/v 2f/slash 74/t 74/t 79/y 0/nul # on Linux console #? # "/dev/console" #? 2f/slash 64/d 65/e 76/v 2f/slash 63/c 6f/o 6e/n 73/s 6f/o 6c/l 65/e 0/nul