| 111,18 → 111,29 |
|---|
| mov dx, [openflag] /* action if file exists (0x11=open, 0x12=truncate)*/ |
| mov si, myptr /* ASCIIZ filename */ |
| int 0x21 /* AX=handle on success (CF clear), otherwise dos err */ |
| mov [handle], ax /* save the file handler */ |
| jnc DUPSTDOUT |
| mov [errcode], ax |
| mov handle, ax /* save the file handler */ |
| jnc JMPEOF |
| mov errcode, ax |
| jmp DONE |
| |
| JMPEOF: |
| cmp openflag, word ptr 0x11 |
| jne DUPSTDOUT |
| /* jump to the end of the file (required for >> redirections) */ |
| mov ax, 0x4202 /* jump to position EOF - CX:DX in handle BX */ |
| mov bx, handle |
| xor cx, cx |
| xor dx, dx |
| int 0x21 |
| |
| /* save (duplicate) current stdout so I can revert it later */ |
| DUPSTDOUT: |
| /* save (duplicate) current stdout so I can revert it later */ |
| mov ah, 0x45 /* duplicate file handle */ |
| mov bx, 1 /* handle to dup (1=stdout) */ |
| int 0x21 /* ax = new file handle */ |
| mov [oldstdout], ax |
| mov oldstdout, ax |
| /* redirect the stdout handle */ |
| mov bx, [handle] /* dst handle */ |
| mov bx, handle /* dst handle */ |
| mov cx, 1 /* src handle (1=stdout) */ |
| mov ah, 0x46 /* redirect a handle */ |
| int 0x21 |