1 d3df3087 2003-12-06 devnull /* Copyright (C) 2003 Russ Cox, Massachusetts Institute of Technology */
 2 d3df3087 2003-12-06 devnull /* See COPYRIGHT */
 3 d3df3087 2003-12-06 devnull 
 4 d3df3087 2003-12-06 devnull #include <u.h>
 5 d3df3087 2003-12-06 devnull #include <libc.h>
 6 d3df3087 2003-12-06 devnull #include <fcall.h>
 7 d3df3087 2003-12-06 devnull #include <fs.h>
 8 d3df3087 2003-12-06 devnull #include "fsimpl.h"
 9 d3df3087 2003-12-06 devnull 
10 d3df3087 2003-12-06 devnull Fid*
11 d3df3087 2003-12-06 devnull fswalk(Fid *fid, char *oname)
12 d3df3087 2003-12-06 devnull {
13 d3df3087 2003-12-06 devnull 	char *freep, *name;
14 d3df3087 2003-12-06 devnull 	int i, nwalk;
15 d3df3087 2003-12-06 devnull 	char *p;
16 d3df3087 2003-12-06 devnull 	Fid *wfid;
17 d3df3087 2003-12-06 devnull 	Fcall tx, rx;
18 d3df3087 2003-12-06 devnull 
19 d3df3087 2003-12-06 devnull 	freep = nil;
20 d3df3087 2003-12-06 devnull 	name = oname;
21 d3df3087 2003-12-06 devnull 	if(name){
22 d3df3087 2003-12-06 devnull 		freep = malloc(strlen(name)+1);
23 d3df3087 2003-12-06 devnull 		if(freep == nil)
24 d3df3087 2003-12-06 devnull 			return nil;
25 d3df3087 2003-12-06 devnull 		strcpy(freep, name);
26 d3df3087 2003-12-06 devnull 		name = freep;
27 d3df3087 2003-12-06 devnull 	}
28 d3df3087 2003-12-06 devnull 
29 d3df3087 2003-12-06 devnull 	if((wfid = _fsgetfid(fid->fs)) == nil){
30 d3df3087 2003-12-06 devnull 		free(freep);
31 d3df3087 2003-12-06 devnull 		return nil;
32 d3df3087 2003-12-06 devnull 	}
33 d3df3087 2003-12-06 devnull 
34 d3df3087 2003-12-06 devnull 	nwalk = 0;
35 d3df3087 2003-12-06 devnull 	do{
36 d3df3087 2003-12-06 devnull 		/* collect names */
37 d3df3087 2003-12-06 devnull 		for(i=0; name && *name && i < MAXWELEM; ){
38 d3df3087 2003-12-06 devnull 			p = name;
39 d3df3087 2003-12-06 devnull 			name = strchr(name, '/');
40 d3df3087 2003-12-06 devnull 			if(name)
41 d3df3087 2003-12-06 devnull 				*name++ = 0;
42 d3df3087 2003-12-06 devnull 			if(*p == 0)
43 d3df3087 2003-12-06 devnull 				continue;
44 d3df3087 2003-12-06 devnull 			tx.wname[i++] = p;
45 d3df3087 2003-12-06 devnull 		}
46 d3df3087 2003-12-06 devnull 
47 d3df3087 2003-12-06 devnull 		/* do a walk */
48 d3df3087 2003-12-06 devnull 		tx.type = Twalk;
49 d3df3087 2003-12-06 devnull 		tx.fid = nwalk ? wfid->fid : fid->fid;
50 d3df3087 2003-12-06 devnull 		tx.newfid = wfid->fid;
51 d3df3087 2003-12-06 devnull 		tx.nwname = i;
52 d3df3087 2003-12-06 devnull 		if(fsrpc(fid->fs, &tx, &rx, 0) < 0){
53 d3df3087 2003-12-06 devnull 		Error:
54 d3df3087 2003-12-06 devnull 			free(freep);
55 d3df3087 2003-12-06 devnull 			if(nwalk)
56 d3df3087 2003-12-06 devnull 				fsclose(wfid);
57 d3df3087 2003-12-06 devnull 			else
58 d3df3087 2003-12-06 devnull 				_fsputfid(wfid);
59 d3df3087 2003-12-06 devnull 			return nil;
60 d3df3087 2003-12-06 devnull 		}
61 d3df3087 2003-12-06 devnull 		if(rx.nwqid != tx.nwname){
62 d3df3087 2003-12-06 devnull 			/* XXX lame error */
63 d3df3087 2003-12-06 devnull 			werrstr("file '%s' not found", oname);
64 d3df3087 2003-12-06 devnull 			goto Error;
65 d3df3087 2003-12-06 devnull 		}
66 d3df3087 2003-12-06 devnull 		if(rx.nwqid == 0)
67 d3df3087 2003-12-06 devnull 			wfid->qid = fid->qid;
68 d3df3087 2003-12-06 devnull 		else
69 d3df3087 2003-12-06 devnull 			wfid->qid = rx.wqid[rx.nwqid-1];
70 d3df3087 2003-12-06 devnull 		nwalk++;
71 d3df3087 2003-12-06 devnull 	}while(name && *name);
72 d3df3087 2003-12-06 devnull 	return wfid;
73 d3df3087 2003-12-06 devnull }