SvarDOSSvarDOS Packages

BlueGreycalmElegant

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  → /svarcom/ @ 1797

  → /svarcom/ @ 1798

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Ignore whitespace Rev 1797 → Rev 1798

/svarcom/trunk/command.c
233,6 → 233,24
}
/* returns current DOS drive (0 = A: ; 1 = B: etc) */
static unsigned char _dosgetcurdrive(void);
#pragma aux _dosgetcurdrive = \
"mov ah, 0x19" /* DOS 1+ - GET CURRENT DRIVE */ \
"int 0x21" \
modify [ah] \
value [al]
static void _dosgetcurdir(char near *s);
#pragma aux _dosgetcurdir = \
"mov ah, 0x47" /* DOS 2+ - CWD - GET CURRENT DIRECTORY */ \
"xor dl, dl" /* DL = drive number (00h = default, 01h = A:, etc) */ \
"int 0x21" \
parm [si] \
modify [ax dl]
/* builds the prompt string and displays it. buff is filled with a zero-terminated copy of the prompt. */
static void build_and_display_prompt(char *buff, unsigned short envseg) {
char *s = buff;
268,33 → 286,15
break;
case 'P': /* $P = current drive and path */
case 'p':
_asm {
mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */
int 0x21
mov bx, s
mov [bx], al /* AL = drive (00 = A:, 01 = B:, etc */
}
*s += 'A';
*s = _dosgetcurdrive() + 'A';
s++;
*s = ':';
s++;
*s = '\\';
s++;
_asm {
mov ah, 0x47 /* DOS 2+ - CWD - GET CURRENT DIRECTORY */
xor dl,dl /* DL = drive number (00h = default, 01h = A:, etc) */
mov si, s /* DS:SI -> 64-byte buffer for ASCIZ pathname */
int 0x21
jc DONE /* leave path empty on error */
/* move s ptr forward to end (0-termintor) of pathname */
NEXTBYTE:
mov si, s
cmp byte ptr [si], 0
je DONE
inc s
jmp NEXTBYTE
DONE:
}
_dosgetcurdir(s);
/* move s ptr forward to end (0-termintor) of pathname */
while (*s != 0) s++;
break;
case 'V': /* $V = DOS version number */
case 'v':
302,13 → 302,7
break;
case 'N': /* $N = current drive */
case 'n':
_asm {
mov ah, 0x19 /* DOS 1+ - GET CURRENT DRIVE */
int 0x21
mov bx, s
mov [bx], al /* AL = drive (00 = A:, 01 = B:, etc */
}
*s += 'A';
*s = _dosgetcurdrive() + 'A';
s++;
break;
case 'G': /* $G = > (greater-than sign) */