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 * Eclipse Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.eclipse.org/org/documents/epl-v10.html *
11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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
39 char*
fmtfs(struct stat * st)40 fmtfs(struct stat* st)
41 {
42 return st->st_fstype;
43 }
44
45 #else
46
47 #include <cdt.h>
48
49 typedef struct Id_s
50 {
51 Dtlink_t link;
52 dev_t id;
53 char name[1];
54 } Id_t;
55
56 char*
fmtfs(struct stat * st)57 fmtfs(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, Dtset);
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