cpython/Mac/Compat/nfullpath.c

/* GET FULL PATHNAME OF A FILE.
** Original by Guido, modified by Jack to handle FSSpecs 
** (and only tested under MetroWerks, so far)
*/

#include <string.h>

#include <Files.h>

#include "nfullpath.h"

/* Mac file system parameters */
#define MAXPATH 256	/* Max path name length+1 */
#define SEP ':'		/* Separator in path names */
#define ROOTID 2	/* DirID of a volume's root directory */

/* Macro to find out whether we can do HFS-only calls: */
#define FSFCBLen (* (short *) 0x3f6)
#define hfsrunning() (FSFCBLen > 0)

int
nfullpath(fsp, retbuf)
	FSSpec *fsp;
	char *retbuf;
{
	union {
		HFileInfo f;
		DirInfo d;
		WDPBRec w;
		VolumeParam v;
	} pb;
	static char cwd[2*MAXPATH];
	unsigned char namebuf[MAXPATH];
	short err;
	int dir;
	long dirid;
	char *next= cwd + sizeof cwd - 1;
	int len;
	
	
	if (!hfsrunning())
		return -1;
	
	dir  = fsp->vRefNum;
	dirid = fsp->parID;
	/* Stuff the filename into the buffer */
	len = fsp->name[0];
	*next = '\0';
	next -= len+1;
	memcpy(next, &fsp->name[1], len);
	
	for (;;) {
		pb.d.ioNamePtr= namebuf;
		pb.d.ioVRefNum= dir;
		pb.d.ioFDirIndex= -1;
		pb.d.ioDrDirID= dirid;
		err= PBGetCatInfo((CInfoPBPtr)&pb.d, 0);
		if (err != noErr) {
			return err;
		}
		*--next= SEP;
		len= namebuf[0];
		if ( len + strlen(next) >= MAXPATH )
			return -1;
		next -= len;
		memcpy(next, (char *)namebuf+1, len);
		if (pb.d.ioDrDirID == ROOTID)
			break;
		dirid= pb.d.ioDrParID;
	}
	strcpy(retbuf, next);
	return 0;
}