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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/string/fmtfs.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * Glenn Fowler

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 * AT&T Bell Laboratories

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 *

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 * return fs type string given stat

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 */

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#include <ast.h>

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#include <ls.h>

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#include <mnt.h>

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#include "FEATURE/fs"

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#if _str_st_fstype

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char*

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fmtfs(struct stat* st)

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{

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	return st->st_fstype;

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}

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#else

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#include <cdt.h>

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typedef struct Id_s

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{

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	Dtlink_t	link;

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	dev_t		id;

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	char		name[1];

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} Id_t;

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char*

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fmtfs(struct stat* st)

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{

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	register Id_t*		ip;

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	register void*		mp;

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	register Mnt_t*		mnt;

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	register char*		s;

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	struct stat		rt;

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	char*			buf;

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	static Dt_t*		dict;

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	static Dtdisc_t		disc;

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	if (!dict)

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	{

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		disc.key = offsetof(Id_t, id);

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		disc.size = sizeof(dev_t);

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		dict = dtopen(&disc, Dtset);

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	}

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	else if (ip = (Id_t*)dtmatch(dict, &st->st_dev))

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		return ip->name;

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	s = FS_default;

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	if (mp = mntopen(NiL, "r"))

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	{

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		while ((mnt = mntread(mp)) && (stat(mnt->dir, &rt) || rt.st_dev != st->st_dev));

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		if (mnt && mnt->type)

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			s = mnt->type;

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	}

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	if (!dict || !(ip = newof(0, Id_t, 1, strlen(s))))

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	{

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		if (!mp)

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			return s;

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		buf = fmtbuf(strlen(s) + 1);

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		strcpy(buf, s);

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		mntclose(mp);

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		return buf;

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	}

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	strcpy(ip->name, s);

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	if (mp)

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		mntclose(mp);

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	dtinsert(dict, ip);

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	return ip->name;

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}

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#endif

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