| 52,17 → 52,21 |
|---|
| REDIR_INFIL: times 128 db 0 ; +EAh |
| REDIR_OUTFIL: times 128 db 0 ; +16Ah |
| REDIR_OUTAPPEND: dw 0 ; +1EAh |
| REDIR_DEL_STDIN: db 0 ; +1ECh indicates that the stdin file |
| ; should be deleted (pipes). This |
| ; MUST contain the 1st char of |
| ; REDIR_INFIL! |
| |
| ; CTRL+BREAK (int 23h) handler |
| ; According to the TechHelp! Manual: "If you want to abort (exit to the parent |
| ; process), then set the carry flag and return via a FAR RET. This causes DOS |
| ; to perform normal cleanup and exit to the parent." (otherwise use iret) |
| BREAK_HANDLER: ; +1ECh |
| BREAK_HANDLER: ; +1EDh |
| stc |
| retf |
| |
| |
| skipsig: ; +1EEh |
| skipsig: ; +1EFh |
| |
| ; set up CS=DS=SS and point SP to my private stack buffer |
| mov ax, cs |
| 79,7 → 83,7 |
|---|
| ; revert stdin/stdout redirections (if any) to their initial state |
| call REVERT_REDIR_IF_ANY |
| |
| ; redirect stdout if required |
| ; redirect stdin and/or stdout if required |
| call REDIR_INOUTFILE_IF_REQUIRED |
| |
| ; should I executed command.com or a pre-set application? |
| 184,8 → 188,6 |
|---|
| |
| ; ---------------------------------------------------------------------------- |
| ; revert stdin/stdout redirections (if any) to their initial state |
| ; all memory accesses are CS-prefixes because this code may be called at |
| ; times when DS is out of whack. |
| REVERT_REDIR_IF_ANY: |
| ; is stdout redirected? |
| mov bx, [OLD_STDOUT] |
| 213,6 → 215,19 |
|---|
| mov ah, 0x3e |
| int 0x21 |
| mov [OLD_STDIN], word 0xffff ; mark stdin as "not redirected" |
| |
| ; delete stdin file if required |
| cmp [REDIR_DEL_STDIN], byte 0 |
| je STDIN_DONE |
| ; revert the original file and delete it |
| mov ah, [REDIR_DEL_STDIN] |
| mov [REDIR_INFIL], ah |
| mov ah, 0x41 ; DOS 2+ - delete file pointed at by DS:DX |
| mov dx, REDIR_INFIL |
| int 0x21 |
| mov [REDIR_INFIL], byte 0 |
| mov [REDIR_DEL_STDIN], byte 0 |
| |
| STDIN_DONE: |
| |
| ret |