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#include <u.h>
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#include <libc.h>
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#include <auth.h>
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#include <fcall.h>
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#include <bio.h>
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#include "tapefs.h"
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Idmap *
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getpass(char *file)
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{
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	Biobuf *bp;
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	char *cp;
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	Idmap *up;
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	int nid, maxid;
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	char *line[4];
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	if ((bp = Bopen(file, OREAD)) == 0)
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		error("Can't open passwd/group");
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	up = emalloc(1*sizeof(Idmap));
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	maxid = 1;
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	nid = 0;
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	while ((cp = Brdline(bp, '\n'))) {
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		int nf;
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		cp[Blinelen(bp)-1] = 0;
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		nf = getfields(cp, line, 3, 0, ":\n");
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		if (nf<3) {
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			fprint(2, "bad format in %s\n", file);
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			break;
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		}
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		if (nid>=maxid) {
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			maxid *= 2;
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			up = (Idmap *)erealloc(up, maxid*sizeof(Idmap));
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		}
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		up[nid].id = atoi(line[2]);
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		up[nid].name = strdup(line[0]);
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		nid++;
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	}
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	Bterm(bp);
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	up[nid].name = 0;
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	return up;
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}
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char *
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mapid(Idmap *up, int id)
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{
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	char buf[16];
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	if (up)
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		while (up->name){
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			if (up->id==id)
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				return strdup(up->name);
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			up++;
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		}
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	sprint(buf, "%d", id);
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	return strdup(buf);
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}
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Ram *
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poppath(Fileinf fi, int new)
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{
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	char *suffix, *origname;
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	Ram *dir, *ent;
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	Fileinf f;
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	if (*fi.name=='\0')
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		return 0;
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	origname = estrdup(fi.name);
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	if (suffix=strrchr(fi.name, '/')){
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		*suffix = 0;
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		suffix++;
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		if (*suffix=='\0'){
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			fi.mode |= DMDIR;
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			free(origname);
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			return poppath(fi, 1);
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		}
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		/*
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		 * create parent directory of suffix;
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		 * may recurse, thus shortening fi.name even further.
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		 */
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		f = fi;
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		f.size = 0;
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		f.addr = 0;
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		f.mode = 0555|DMDIR;
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		dir = poppath(f, 0);
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		if (dir==0)
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			dir = ram;
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	} else {
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		suffix = fi.name;
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		dir = ram;
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		if (strcmp(suffix, ".")==0) {
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			free(origname);
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			return dir;
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		}
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	}
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	ent = lookup(dir, suffix);
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	fi.mode |= 0400;			/* at least user read */
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	if (ent){
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		if (((fi.mode&DMDIR)!=0) != ((ent->qid.type&QTDIR)!=0)){
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			fprint(2,
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		"%s file type changed; probably due to union dir.; ignoring\n",
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				origname);
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			free(origname);
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			return ent;
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		}
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		if (new)  {
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			ent->ndata = fi.size;
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			ent->addr = fi.addr;
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			ent->data = fi.data;
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			ent->perm = fi.mode;
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			ent->mtime = fi.mdate;
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			ent->user = mapid(uidmap, fi.uid);
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			ent->group = mapid(gidmap, fi.gid);
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		}
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	} else {
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		fi.name = suffix;
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		ent = popfile(dir, fi);
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	}
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	free(origname);
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	return ent;
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}
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Ram *
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popfile(Ram *dir, Fileinf fi)
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{
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	Ram *ent = (Ram *)emalloc(sizeof(Ram));
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	if (*fi.name=='\0')
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		return 0;
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	ent->busy = 1;
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	ent->open = 0;
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	ent->parent = dir;
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	ent->next = dir->child;
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	dir->child = ent;
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	ent->child = 0;
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	ent->qid.path = ++path;
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	ent->qid.vers = 0;
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	if(fi.mode&DMDIR)
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		ent->qid.type = QTDIR;
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	else
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		ent->qid.type = QTFILE;
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	ent->perm = fi.mode;
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	ent->name = estrdup(fi.name);
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	ent->atime = ent->mtime = fi.mdate;
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	ent->user = mapid(uidmap, fi.uid);
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	ent->group = mapid(gidmap, fi.gid);
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	ent->ndata = fi.size;
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	ent->data = fi.data;
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	ent->addr = fi.addr;
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	ent->replete |= replete;
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	return ent;
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}
151 
 
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Ram *
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lookup(Ram *dir, char *name)
154 
{
155 
	Ram *r;
156 
 
157 
	if (dir==0)
158 
		return 0;
159 
	for (r=dir->child; r; r=r->next){
160 
		if (r->busy==0 || strcmp(r->name, name)!=0)
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			continue;
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		return r;
163 
	}
164 
	return 0;
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}