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fmtgid.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2009 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                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
 *
 * cached gid number -> name
 */

#if defined(__STDPP__directive) && defined(__STDPP__hide)
__STDPP__directive pragma pp:hide getgrgid
#else
#define getgrgid  ______getgrgid
#endif

#include <ast.h>
#include <cdt.h>
#include <grp.h>

#if defined(__STDPP__directive) && defined(__STDPP__hide)
__STDPP__directive pragma pp:nohide getgrgid
#else
#undef      getgrgid
#endif

extern struct group*    getgrgid(gid_t);

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

/*
 * return gid name given gid number
 */

char*
fmtgid(int gid)
{
      register Id_t*          ip;
      register char*          name;
      register struct group*  gr;
      int               z;

      static Dt_t*            dict;
      static Dtdisc_t         disc;

      if (!dict)
      {
            disc.key = offsetof(Id_t, id);
            disc.size = sizeof(int);
            dict = dtopen(&disc, Dthash);
      }
      else if (ip = (Id_t*)dtmatch(dict, &gid))
            return ip->name;
      if (gr = getgrgid(gid))
      {
            name = gr->gr_name;
#if _WINIX
            if (streq(name, "Administrators"))
                  name = "sys";
#endif
      }
      else if (gid == 0)
            name = "sys";
      else
      {
            name = fmtbuf(z = sizeof(gid) * 3 + 1);
            sfsprintf(name, z, "%I*d", sizeof(gid), gid);
      }
      if (dict && (ip = newof(0, Id_t, 1, strlen(name))))
      {
            ip->id = gid;
            strcpy(ip->name, name);
            dtinsert(dict, ip);
            return ip->name;
      }
      return name;
}

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