0,0 → 1,110 |
/* This file is part of the SvarCOM project and is published under the terms |
* of the MIT license. |
* |
* Copyright (C) 2021 Mateusz Viste |
* |
* Permission is hereby granted, free of charge, to any person obtaining a |
* copy of this software and associated documentation files (the "Software"), |
* to deal in the Software without restriction, including without limitation |
* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
* and/or sell copies of the Software, and to permit persons to whom the |
* Software is furnished to do so, subject to the following conditions: |
* |
* The above copyright notice and this permission notice shall be included in |
* all copies or substantial portions of the Software. |
* |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
* DEALINGS IN THE SOFTWARE. |
*/ |
|
/* |
* 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); |
} |