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 (p->argc == 0) { |
outputnl("Required parameter missing"); |
return(-1); |
} |
|
if ((p->argc > 0) && (imatch(p->argv[0], "/?"))) { |
outputnl("Displays the contents of a text file."); |
outputnl(""); |
outputnl("TYPE [drive:][path]filename"); |
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 |
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FOPENFAIL: |
|
pop si |
pop dx |
pop cx |
pop bx |
pop ax |
} |
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if (err != 0) outputnl(doserr(err)); |
|
return(-1); |
} |