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/*
* chdir
*
* displays the name of or changes the current directory.
*
* CHDIR [drive:][path]
* CD..
*
* Type CD drive: to display the current directory in the specified drive.
* Type CD without parameters to display the current drive and directory.
*/
static int cmd_cd(struct cmd_funcparam *p) {
char *buffptr = p->BUFFER;
/* CD /? */
if (cmd_ishlp(p)) {
outputnl("Displays the name of or changes the current directory.");
outputnl("");
outputnl("CHDIR [drive:][path]");
outputnl("CHDIR[..]");
outputnl("CD [drive:][path]");
outputnl("CD[..]");
outputnl("");
outputnl(".. Specifies that you want to change to the parent directory.");
outputnl("");
outputnl("Type CD drive: to display the current directory in the specified drive.");
outputnl("Type CD without parameters to display the current drive and directory.");
return(-1);
}
/* one argument max */
if (p->argc > 1) {
outputnl("Too many parameters");
return(-1);
}
/* no argument? display current drive and dir ("CWD") */
if (p->argc == 0) {
curpathfordrv(buffptr, 0);
outputnl(buffptr);
return(-1);
}
/* argument can be either a drive (D:) or a path */
if (p->argc == 1) {
const char *arg = p->argv[0];
unsigned short err = 0;
/* drive (CD B:) */
if ((arg[0] != '\\') && (arg[1] == ':') && (arg[2] == 0)) {
unsigned char drive = arg[0];
if (drive >= 'a') {
drive -= ('a' - 1);
} else {
drive -= ('A' - 1);
}
err = curpathfordrv(buffptr, drive);
if (err == 0) outputnl(buffptr);
} else { /* path */
_asm {
push dx
push ax
mov ah, 0x3B /* CHDIR (set current directory) */
mov dx, arg
int 0x21
jnc DONE
mov [err], ax
DONE:
pop ax
pop dx
}
}
if (err != 0) {
outputnl(doserr(err));
}
}
return(-1);
}