twalk.c - plan9port - [fork] Plan 9 from user space
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       ---
       twalk.c (1287B)
       ---
            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 }