ack/plat/msdos386/libsys/isatty.s

#
! $Source$
! $State$
! $Revision$

#include "libsysasm.h"

! Say whether a given file descriptor number refers to a terminal.

.define _isatty
_isatty:
	mov ebx, esp
	mov ebx, 4(ebx)
	o16 mov ax, 0x4400
	int 0x21
	jc error
	testb dl, dl
	jz not_tty
	mov eax, 1
	ret
not_tty:
	mov (_errno), 25		! ENOTTY
not_tty_2:
	xor eax, eax
	ret
error:
	push eax
	call __sys_seterrno
	pop ecx
	jmp not_tty_2
Cut-and-paste the msdos86 libsys so the msdos386 stuff now at least builds. 2022-08-07 20:10:08 +00:00			`#`
			`! $Source$`
			`! $State$`
			`! $Revision$`

plat/msdos386: refactor, firm up, and optimize - refactor code for transfer buffer reads/writes, real mode int 0x21 calls, and assembler segment declarations - define transfer buffer size in one place - beef up error checking for transfer buffer operations (prevent buffer overflows) - also optimize such operations to transfer dword by dword where feasible 2022-08-26 17:20:56 +00:00			`#include "libsysasm.h"`
Cut-and-paste the msdos86 libsys so the msdos386 stuff now at least builds. 2022-08-07 20:10:08 +00:00
			`! Say whether a given file descriptor number refers to a terminal.`

			`.define _isatty`
			`_isatty:`
Most of read and write now works; filename-based operations partially work; but there's a nasty memory corruption somewhere which needs investigating. 2022-08-18 22:08:57 +00:00			`mov ebx, esp`
write() system calls work; start going through the libsys. 2022-08-17 20:34:06 +00:00			`mov ebx, 4(ebx)`
			`o16 mov ax, 0x4400`
Cut-and-paste the msdos86 libsys so the msdos386 stuff now at least builds. 2022-08-07 20:10:08 +00:00			`int 0x21`
			`jc error`
			`testb dl, dl`
			`jz not_tty`
write() system calls work; start going through the libsys. 2022-08-17 20:34:06 +00:00			`mov eax, 1`
Cut-and-paste the msdos86 libsys so the msdos386 stuff now at least builds. 2022-08-07 20:10:08 +00:00			`ret`
			`not_tty:`
			`mov (_errno), 25 ! ENOTTY`
			`not_tty_2:`
write() system calls work; start going through the libsys. 2022-08-17 20:34:06 +00:00			`xor eax, eax`
Cut-and-paste the msdos86 libsys so the msdos386 stuff now at least builds. 2022-08-07 20:10:08 +00:00			`ret`
			`error:`
write() system calls work; start going through the libsys. 2022-08-17 20:34:06 +00:00			`push eax`
Cut-and-paste the msdos86 libsys so the msdos386 stuff now at least builds. 2022-08-07 20:10:08 +00:00			`call __sys_seterrno`
write() system calls work; start going through the libsys. 2022-08-17 20:34:06 +00:00			`pop ecx`
Cut-and-paste the msdos86 libsys so the msdos386 stuff now at least builds. 2022-08-07 20:10:08 +00:00			`jmp not_tty_2`