| 0,0 → 1,86 |
|---|
| /* |
| * type |
| */ |
| |
| static int cmd_type(struct cmd_funcparam *p) { |
| char *buff = p->BUFFER; |
| const char *fname = p->argv[0]; |
| unsigned short err = 0; |
| |
| if (cmd_ishlp(p)) { |
| outputnl("Displays the contents of a text file."); |
| outputnl(""); |
| outputnl("TYPE [drive:][path]filename"); |
| return(-1); |
| } |
| |
| if (p->argc == 0) { |
| outputnl("Required parameter missing"); |
| return(-1); |
| } |
| |
| if (p->argc > 1) { |
| outputnl("Too many parameters"); |
| return(-1); |
| } |
| |
| /* if here then display the file */ |
| _asm { |
| push ax |
| push bx |
| push cx |
| push dx |
| push si |
| |
| mov ax, 0x3d00 /* open file via handle, access mode in AL (0 = read) */ |
| mov dx, fname |
| int 0x21 /* file handle in ax on success (CF clear) */ |
| jnc FILE_OPEN_OK |
| mov [err], ax /* on error AX contains the DOS err code */ |
| jmp FOPENFAIL |
| FILE_OPEN_OK: |
| /* copy obtained file handle to BX */ |
| mov bx, ax |
| |
| READNEXTBLOCK: |
| /* read file block by block */ |
| mov cx, 1024 /* read 1K at a time */ |
| mov dx, buff |
| mov ah, 0x3f /* read CX bytes from file handle in BX and write to DS:DX */ |
| int 0x21 /* CF set on error, AX=errno or AX=number of bytes read */ |
| jc GOTERROR /* abort on error */ |
| test ax, ax /* EOF? */ |
| jz ENDFILE |
| /* display read block (AX=len) */ |
| mov si, dx /* preset DS:SI to DS:DX (DL will be reused soon) */ |
| mov cx, ax /* set loop count to CX */ |
| mov ah, 0x02 /* write character in DL to stdout */ |
| NEXTCHAR: |
| mov dl, [si] |
| inc si |
| int 0x21 |
| loopnz NEXTCHAR /* CX-- ; jnz NEXTCHAR (display CX characters) */ |
| /* read (and display) next block */ |
| jmp READNEXTBLOCK |
| |
| GOTERROR: |
| mov [err], ax |
| |
| ENDFILE: |
| /* close file */ |
| mov ah, 0x3e /* close file handle (file handle already in BX) */ |
| int 0x21 |
| |
| FOPENFAIL: |
| |
| pop si |
| pop dx |
| pop cx |
| pop bx |
| pop ax |
| } |
| |
| if (err != 0) outputnl(doserr(err)); |
| |
| return(-1); |
| } |