1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23
24/*
25 * Glenn Fowler
26 * AT&T Bell Laboratories
27 *
28 * return fs type string given stat
29 */
30
31#include <ast.h>
32#include <ls.h>
33#include <mnt.h>
34
35#include "FEATURE/fs"
36
37#if _str_st_fstype
38
39char*
40fmtfs(struct stat* st)
41{
42	return st->st_fstype;
43}
44
45#else
46
47#include <cdt.h>
48
49typedef struct Id_s
50{
51	Dtlink_t	link;
52	dev_t		id;
53	char		name[1];
54} Id_t;
55
56char*
57fmtfs(struct stat* st)
58{
59	register Id_t*		ip;
60	register void*		mp;
61	register Mnt_t*		mnt;
62	register char*		s;
63	struct stat		rt;
64	char*			buf;
65
66	static Dt_t*		dict;
67	static Dtdisc_t		disc;
68
69	if (!dict)
70	{
71		disc.key = offsetof(Id_t, id);
72		disc.size = sizeof(dev_t);
73		dict = dtopen(&disc, Dthash);
74	}
75	else if (ip = (Id_t*)dtmatch(dict, &st->st_dev))
76		return ip->name;
77	s = FS_default;
78	if (mp = mntopen(NiL, "r"))
79	{
80		while ((mnt = mntread(mp)) && (stat(mnt->dir, &rt) || rt.st_dev != st->st_dev));
81		if (mnt && mnt->type)
82			s = mnt->type;
83	}
84	if (!dict || !(ip = newof(0, Id_t, 1, strlen(s))))
85	{
86		if (!mp)
87			return s;
88		buf = fmtbuf(strlen(s) + 1);
89		strcpy(buf, s);
90		mntclose(mp);
91		return buf;
92	}
93	strcpy(ip->name, s);
94	if (mp)
95		mntclose(mp);
96	dtinsert(dict, ip);
97	return ip->name;
98}
99
100#endif
101