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/*
** GETDCWD.C - returns the current working directory for a specific drive
**
** public domain by Bob Jarvis, modified by Bob Stout
*/
#if defined(__ZTC__)
#define GetDrive(d) dos_getdrive(&d)
#define FAR _far
#elif defined(__TURBOC__)
#define GetDrive(d) ((d) = getdisk() + 1)
#define FAR far
#else /* assume MSC */
#define GetDrive(d) _dos_getdrive(&d)
#define FAR _far
#endif
#include <dos.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
char *getdcwd(unsigned int drive) /* 0 = current, 1 = A, 2 = B, etc */
{
union REGS regs;
struct SREGS sregs;
char *retptr;
retptr = calloc(FILENAME_MAX + 4, sizeof(char));
if(retptr == NULL)
return NULL;
if(drive == 0) /* figure out which drive is current */
{
GetDrive(drive);
drive += 1;
}
*retptr = (char)((drive-1) + 'A');
*(retptr+1) = ':';
*(retptr+2) = '\\';
segread(&sregs);
regs.h.ah = 0x47;
regs.h.dl = (unsigned char)drive;
sregs.ds = FP_SEG((void FAR *)retptr);
regs.x.si = FP_OFF((void FAR *)retptr) + 3;
intdosx(®s, ®s, &sregs);
if (15 == regs.x.ax) /* drive number invalid */
{
free(retptr);
return NULL;
}
else return retptr;
}
#ifdef TEST
void main(int argc, char *argv[])
{
char *curpath;
unsigned int n;
if(argc > 1)
n = (tolower(*argv[1]) - 'a') + 1;
else GetDrive(n);
printf("curpath = '%s'\n", curpath = getdcwd(n));
if (curpath)
free(curpath);
}
#endif
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