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