1 46f79934 2005-01-04 devnull /* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
 2 46f79934 2005-01-04 devnull /* See COPYRIGHT */
 3 46f79934 2005-01-04 devnull 
 4 46f79934 2005-01-04 devnull #include <u.h>
 5 46f79934 2005-01-04 devnull #include <libc.h>
 6 46f79934 2005-01-04 devnull #include <fcall.h>
 7 46f79934 2005-01-04 devnull #include <9pclient.h>
 8 46f79934 2005-01-04 devnull #include "fsimpl.h"
 9 46f79934 2005-01-04 devnull 
10 46f79934 2005-01-04 devnull CFid*
11 73a5509a 2006-07-23 devnull fswalk(CFid *fid, char *oname)
12 46f79934 2005-01-04 devnull {
13 46f79934 2005-01-04 devnull 	char *freep, *name;
14 46f79934 2005-01-04 devnull 	int i, nwalk;
15 46f79934 2005-01-04 devnull 	char *p;
16 46f79934 2005-01-04 devnull 	CFid *wfid;
17 46f79934 2005-01-04 devnull 	Fcall tx, rx;
18 46f79934 2005-01-04 devnull 
19 46f79934 2005-01-04 devnull 	freep = nil;
20 46f79934 2005-01-04 devnull 	name = oname;
21 46f79934 2005-01-04 devnull 	if(name){
22 46f79934 2005-01-04 devnull 		freep = malloc(strlen(name)+1);
23 46f79934 2005-01-04 devnull 		if(freep == nil)
24 46f79934 2005-01-04 devnull 			return nil;
25 46f79934 2005-01-04 devnull 		strcpy(freep, name);
26 46f79934 2005-01-04 devnull 		name = freep;
27 46f79934 2005-01-04 devnull 	}
28 46f79934 2005-01-04 devnull 
29 46f79934 2005-01-04 devnull 	if((wfid = _fsgetfid(fid->fs)) == nil){
30 46f79934 2005-01-04 devnull 		free(freep);
31 46f79934 2005-01-04 devnull 		return nil;
32 46f79934 2005-01-04 devnull 	}
33 46f79934 2005-01-04 devnull 
34 46f79934 2005-01-04 devnull 	nwalk = 0;
35 46f79934 2005-01-04 devnull 	do{
36 46f79934 2005-01-04 devnull 		/* collect names */
37 46f79934 2005-01-04 devnull 		for(i=0; name && *name && i < MAXWELEM; ){
38 46f79934 2005-01-04 devnull 			p = name;
39 46f79934 2005-01-04 devnull 			name = strchr(name, '/');
40 46f79934 2005-01-04 devnull 			if(name)
41 46f79934 2005-01-04 devnull 				*name++ = 0;
42 46f79934 2005-01-04 devnull 			if(*p == 0 || (*p == '.' && *(p+1) == 0))
43 46f79934 2005-01-04 devnull 				continue;
44 46f79934 2005-01-04 devnull 			tx.wname[i++] = p;
45 46f79934 2005-01-04 devnull 		}
46 46f79934 2005-01-04 devnull 
47 46f79934 2005-01-04 devnull 		/* do a walk */
48 46f79934 2005-01-04 devnull 		tx.type = Twalk;
49 46f79934 2005-01-04 devnull 		tx.fid = nwalk ? wfid->fid : fid->fid;
50 46f79934 2005-01-04 devnull 		tx.newfid = wfid->fid;
51 46f79934 2005-01-04 devnull 		tx.nwname = i;
52 46f79934 2005-01-04 devnull 		if(_fsrpc(fid->fs, &tx, &rx, 0) < 0){
53 46f79934 2005-01-04 devnull 		Error:
54 46f79934 2005-01-04 devnull 			free(freep);
55 46f79934 2005-01-04 devnull 			if(nwalk)
56 46f79934 2005-01-04 devnull 				fsclose(wfid);
57 46f79934 2005-01-04 devnull 			else
58 46f79934 2005-01-04 devnull 				_fsputfid(wfid);
59 46f79934 2005-01-04 devnull 			return nil;
60 46f79934 2005-01-04 devnull 		}
61 46f79934 2005-01-04 devnull 		if(rx.nwqid != tx.nwname){
62 46f79934 2005-01-04 devnull 			/* XXX lame error */
63 46f79934 2005-01-04 devnull 			werrstr("file '%s' not found", oname);
64 46f79934 2005-01-04 devnull 			goto Error;
65 46f79934 2005-01-04 devnull 		}
66 46f79934 2005-01-04 devnull 		if(rx.nwqid == 0)
67 46f79934 2005-01-04 devnull 			wfid->qid = fid->qid;
68 46f79934 2005-01-04 devnull 		else
69 46f79934 2005-01-04 devnull 			wfid->qid = rx.wqid[rx.nwqid-1];
70 46f79934 2005-01-04 devnull 		nwalk++;
71 46f79934 2005-01-04 devnull 	}while(name && *name);
72 46f79934 2005-01-04 devnull 	return wfid;
73 46f79934 2005-01-04 devnull }