| 166,9 → 166,11 |
|---|
| OLD_STDIN dw 0xffff |
| |
| |
| ; **************************************************************************** |
| ; *** ROUTINES *************************************************************** |
| ; **************************************************************************** |
| |
| |
| ; ---------------------------------------------------------------------------- |
| ; 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. |
| 187,8 → 189,10 |
|---|
| mov [OLD_STDOUT], word 0xffff ; mark stdout as "not redirected" |
| STDOUT_DONE: |
| ret |
| ; ---------------------------------------------------------------------------- |
| |
| |
| ; ---------------------------------------------------------------------------- |
| ; redirect stdout if REDIR_OUTFIL points to something |
| REDIR_OUTFILE_IF_REQUIRED: |
| mov si, [REDIR_OUTFIL] |
| 202,6 → 206,18 |
|---|
| int 0x21 ; ax=handle on success (CF clear) |
| mov [REDIR_OUTFIL], word 0xffff |
| jc NO_STDOUT_REDIR ; TODO: abort with an error message instead |
| |
| ; jump to end of file if flag was 0x11 (required for >> redirections) |
| cmp [REDIR_OUTAPPEND], word 0x11 |
| jne SKIP_JMPEOF |
| mov bx, ax |
| mov ax, 0x4202 ; jump to position EOF - CX:DX in handle BX |
| xor cx, cx |
| xor dx, dx |
| int 0x21 |
| mov ax, bx ; put my handle back in ax, as expected by later code |
| SKIP_JMPEOF: |
| |
| ; duplicate current stdout so I can revert it later |
| push ax ; save my file handle in stack |
| mov ah, 0x45 ; duplicate file handle BX |
| 208,13 → 224,16 |
|---|
| mov bx, 1 ; 1=stdout |
| int 0x21 ; ax=new (duplicated) file handle |
| mov [OLD_STDOUT], ax ; save the old handle in memory |
| |
| ; redirect stdout to my file |
| pop bx ; dst handle |
| mov cx, 1 ; src handle (1=stdout) |
| mov ah, 0x46 ; "redirect a handle" |
| int 0x21 |
| |
| ; close the original file handle, I no longer need it |
| mov ah, 0x3e ; close a file handle (handle in BX) |
| int 0x21 |
| NO_STDOUT_REDIR: |
| ret |
| ; ---------------------------------------------------------------------------- |