0,0 → 1,104 |
/* |
* 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(int argc, char const **argv) { |
/* two arguments max */ |
if (argc > 2) { |
puts("Too many parameters"); |
} |
|
/* no argument? display current drive and dir ("CWD") */ |
if (argc == 1) { |
char buff[64]; |
char *buffptr = buff; |
_asm { |
push ax |
push dx |
push si |
mov ah, 0x19 /* get current default drive */ |
int 0x21 /* al = drive (00h = A:, 01h = B:, etc) */ |
add al, 'A' |
/* print drive to stdout */ |
mov dl, al |
mov ah, 0x02 |
int 0x21 |
mov dl, ':' |
int 0x21 |
mov dl, '\' |
int 0x21 |
/* get current dir */ |
mov ah, 0x47 |
xor dl, dl /* select drive (0 = current drive) */ |
mov si, buffptr /* 64-byte buffer for ASCIZ pathname */ |
int 0x21 |
pop ax |
pop dx |
pop si |
} |
puts(buff); |
} |
|
/* argument can be either a drive (D:) or a path */ |
if (argc == 2) { |
/* drive (CD B:) */ |
if ((argv[1][0] != '\\') && (argv[1][1] == ':') && (argv[1][2] == 0)) { |
char buff[64]; |
char *buffptr = buff; |
unsigned char drive = argv[1][0]; |
unsigned short err = 0; |
if (drive >= 'a') { |
drive -= 'a'; |
} else { |
drive -= 'A'; |
} |
drive++; /* A: = 1, B: = 2, etc*/ |
_asm { |
push si |
push ax |
push dx |
mov ah, 0x47 /* get current directory */ |
mov dl, [drive] /* A: = 1, B: = 2, etc */ |
mov si, buffptr |
int 0x21 |
jnc DONE |
mov [err], ax |
DONE: |
pop dx |
pop ax |
pop si |
} |
if (err != 0) { |
if (err != 0) puts(doserr(err)); |
} else { |
printf("%c:\\%s\r\n", drive + 'A' - 1, buff); |
} |
} else { /* path */ |
char const *dir = argv[1]; |
unsigned short err = 0; |
_asm { |
push dx |
push ax |
mov ah, 0x3B /* CHDIR (set current directory) */ |
mov dx, dir |
int 0x21 |
jnc DONE |
mov [err], ax |
DONE: |
pop ax |
pop dx |
} |
if (err != 0) puts(doserr(err)); |
} |
} |
|
return(-1); |
} |