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fmtfs.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2006 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

/*
 * Glenn Fowler
 * AT&T Bell Laboratories
 *
 * return fs type string given stat
 */

#include <ast.h>
#include <ls.h>
#include <mnt.h>

#include "FEATURE/fs"

#if _str_st_fstype

char*
fmtfs(struct stat* st)
{
      return st->st_fstype;
}

#else

#include <cdt.h>

typedef struct Id_s
{
      Dtlink_t    link;
      dev_t       id;
      char        name[1];
} Id_t;

char*
fmtfs(struct stat* st)
{
      register Id_t*          ip;
      register void*          mp;
      register Mnt_t*         mnt;
      register char*          s;
      struct stat       rt;
      char*             buf;

      static Dt_t*            dict;
      static Dtdisc_t         disc;

      if (!dict)
      {
            disc.key = offsetof(Id_t, id);
            disc.size = sizeof(dev_t);
            dict = dtopen(&disc, Dthash);
      }
      else if (ip = (Id_t*)dtmatch(dict, &st->st_dev))
            return ip->name;
      s = FS_default;
      if (mp = mntopen(NiL, "r"))
      {
            while ((mnt = mntread(mp)) && (stat(mnt->dir, &rt) || rt.st_dev != st->st_dev));
            if (mnt && mnt->type)
                  s = mnt->type;
      }
      if (!dict || !(ip = newof(0, Id_t, 1, strlen(s))))
      {
            if (!mp)
                  return s;
            buf = fmtbuf(strlen(s) + 1);
            strcpy(buf, s);
            mntclose(mp);
            return buf;
      }
      strcpy(ip->name, s);
      if (mp)
            mntclose(mp);
      dtinsert(dict, ip);
      return ip->name;
}

#endif

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