| 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); |
| } |