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mateuszvis |
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/* This file is part of the SvarCOM project and is published under the terms
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* of the MIT license.
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*
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mateusz.vi |
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* Copyright (C) 2021-2022 Mateusz Viste
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/*
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* type
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*/
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static enum cmd_result cmd_type(struct cmd_funcparam *p) {
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char *buff = p->BUFFER;
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const char *fname = p->argv[0];
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unsigned short err = 0;
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if (cmd_ishlp(p)) {
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nls_outputnl(21,0); /* "Displays the contents of a text file." */
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outputnl("");
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nls_outputnl(21,1); /* "TYPE [drive:][path]filename" */
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return(CMD_OK);
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}
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if (p->argc == 0) {
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nls_outputnl(0,7); /* "Required parameter missing" */
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return(CMD_FAIL);
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}
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if (p->argc > 1) {
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nls_outputnl(0,4); /* "Too many parameters" */
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return(CMD_FAIL);
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}
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/* if here then display the file */
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_asm {
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push ax
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push bx
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push cx
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push dx
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push si
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mov ax, 0x3d00 /* open file via handle, access mode in AL (0 = read) */
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mov dx, fname
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int 0x21 /* file handle in ax on success (CF clear) */
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jnc FILE_OPEN_OK
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mov [err], ax /* on error AX contains the DOS err code */
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jmp FOPENFAIL
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FILE_OPEN_OK:
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/* copy obtained file handle to BX */
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mov bx, ax
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READNEXTBLOCK:
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/* read file block by block */
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mov cx, 1024 /* read 1K at a time */
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mov dx, buff
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mov ah, 0x3f /* read CX bytes from file handle in BX and write to DS:DX */
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int 0x21 /* CF set on error, AX=errno or AX=number of bytes read */
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jc GOTERROR /* abort on error */
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test ax, ax /* EOF? */
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jz ENDFILE
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/* display read block (AX=len) */
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mov si, dx /* preset DS:SI to DS:DX (DL will be reused soon) */
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mov cx, ax /* set loop count to CX */
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mov ah, 0x02 /* write character in DL to stdout */
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NEXTCHAR:
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mov dl, [si]
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inc si
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int 0x21
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loopnz NEXTCHAR /* CX-- ; jnz NEXTCHAR (display CX characters) */
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/* read (and display) next block */
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jmp READNEXTBLOCK
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GOTERROR:
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mov [err], ax
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ENDFILE:
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/* close file */
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mov ah, 0x3e /* close file handle (file handle already in BX) */
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int 0x21
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FOPENFAIL:
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pop si
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pop dx
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pop cx
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pop bx
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pop ax
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}
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if (err != 0) {
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nls_outputnl_doserr(err);
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return(CMD_FAIL);
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}
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mateuszvis |
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return(CMD_OK);
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}
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