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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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* Copyright (C) 2021 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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mateuszvis |
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/*
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* vol [drive:]
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*/
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static void cmd_vol_internal(unsigned char drv, char *buff) {
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unsigned short *buff16 = (void *)(buff);
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unsigned short err = 0;
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struct DTA *dta = (void *)0x80; /* use the default DTA at location 80h in PSP */
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outputnl(""); /* start with an empty line to mimic MS-DOS */
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/* look for volume label in root dir via a FindFirst call */
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sprintf(buff, "%c:\\????????.???", drv + 'A');
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_asm {
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push ax
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push cx
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push dx
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mov [err], 0 /* preset errflag to zero */
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mov ah, 0x4e /* FindFirst */
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mov dx, buff
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mov cx, 0x08 /* match volume labels only */
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int 0x21 /* dta filled or CF set on error */
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jnc DONE
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mov [err], ax
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DONE:
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pop dx
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pop cx
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pop ax
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}
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if (err != 0) {
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sprintf(buff, "Volume in drive %c has no label", drv + 'A');
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} else {
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/* if label > 8 chars then drop the dot (DRIVE_LA.BEL -> DRIVE_LABEL) */
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if (strlen(dta->fname) > 8) memmove(dta->fname + 8, dta->fname + 9, 4);
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sprintf(buff, "Volume in drive %c is %s", drv + 'A', dta->fname);
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}
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outputnl(buff);
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/* try to fetch the disk's serial number (DOS 4+ internal call) */
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err = 0;
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_asm {
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push ax
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push bx
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push dx
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mov ax, 0x6900
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mov bl, drv /* A=1, B=2, etc */
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inc bl /* adjust BL to +1 since drv is 0-based (A=0, B=1, etc) */
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xor bh, bh /* "info level", must be 0 */
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mov dx, buff /* pointer to a location where a DiskInfo struct will be written */
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int 0x21
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jnc DONE
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mov [err], ax /* err code */
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DONE:
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pop dx
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pop bx
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pop ax
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}
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/* Format of DiskInfo struct (source: RBIL)
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Offset Size Description (Table 01766)
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00h WORD 0000h (info level)
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02h DWORD disk serial number (binary)
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06h 11 BYTEs volume label or "NO NAME " if none present
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11h 8 BYTEs filesystem type */
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if ((err == 0) && (buff16[1] | buff16[2])) {
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sprintf(buff + 64, "Volume Serial Number is %04X-%04X", buff16[2], buff16[1]);
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outputnl(buff + 64);
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}
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}
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static int cmd_vol(struct cmd_funcparam *p) {
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char drv = 0;
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char curdrv = 0;
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unsigned short i;
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if (cmd_ishlp(p)) {
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outputnl("Displays the disk volume label and serial number, if they exist.");
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outputnl("");
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outputnl("VOL [drive:]");
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return(-1);
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}
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for (i = 0; i < p->argc; i++) {
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if (p->argv[i][0] == '/') {
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outputnl("Invalid switch");
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return(-1);
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}
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if (drv != 0) {
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outputnl("Too many parameters");
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return(-1);
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}
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if ((p->argv[i][0] == 0) || (p->argv[i][1] != ':') || (p->argv[i][2] != 0)) {
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outputnl("Invalid parameter format");
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return(-1);
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}
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drv = p->argv[i][0];
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/* convert drive letter to a value 1..x (1=A, 2=B, etc) */
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if ((drv >= 'a') && (drv <= 'z')) {
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drv -= 'a';
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} else {
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drv -= 'A';
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}
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}
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/* fetch current drive */
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_asm {
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push ax
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mov ah, 0x19 /* query default (current) disk */
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int 0x21 /* drive in AL (0=A, 1=B, etc) */
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mov [curdrv], al
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pop ax
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}
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/* if no drive specified, use the default one */
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if (drv == 0) {
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drv = curdrv;
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} else if (!isdrivevalid(drv)) { /* is specified drive valid? */
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outputnl("Invalid drive");
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return(-1);
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}
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cmd_vol_internal(drv, p->BUFFER);
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return(-1);
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}
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