0,0 → 1,124 |
/* |
* 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. |
*/ |
|
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/* display current path drive d (A=1, B=2, etc) |
* returns 0 on success, doserr otherwise */ |
static unsigned short cmd_cd_curpathfordrv(char *buff, unsigned char d) { |
unsigned short r = 0; |
|
buff[0] = d + 'A' - 1; |
buff[1] = ':'; |
buff[2] = '\\'; |
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_asm { |
push si |
push ax |
push dx |
mov ah, 0x47 /* get current directory */ |
mov dl, [d] /* A: = 1, B: = 2, etc */ |
mov si, buff /* append cur dir to buffer */ |
add si, 3 /* skip the present drive:\ prefix */ |
int 0x21 |
jnc DONE |
mov [r], ax /* copy result from ax */ |
DONE: |
pop dx |
pop ax |
pop si |
} |
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return(r); |
} |
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static int cmd_cd(struct cmd_funcparam *p) { |
char *buffptr = p->BUFFER; |
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/* 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); |
} |
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/* one argument max */ |
if (p->argc > 1) { |
outputnl("Too many parameters"); |
return(-1); |
} |
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/* no argument? display current drive and dir ("CWD") */ |
if (p->argc == 0) { |
unsigned char drv = 0; |
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_asm { |
push ax |
push dx |
push si |
mov ah, 0x19 /* get current default drive */ |
int 0x21 /* al = drive (00h = A:, 01h = B:, etc) */ |
inc al /* convert to 1=A, 2=B, etc */ |
mov [drv], al |
} |
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cmd_cd_curpathfordrv(buffptr, drv); |
outputnl(buffptr); |
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return(-1); |
} |
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/* 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); |
} |
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err = cmd_cd_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); |
} |