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access3d.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1989-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                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>                   *
*                   Eduardo Krell <ekrell@adexus.cl>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include "3d.h"

int
access3d(const char* path, int mode)
{
      register char*    sp;
      mode_t            test;
      struct stat       st;

#if FS
      if (!fscall(NiL, MSG_stat, 0, path, &st))
      {
            if (state.ret) return(-1);
            sp = 0;
      }
      else
#endif
      if (!(sp = pathreal(path, 0, &st)))
            return(-1);

      /*
       * handle some frequent cases separately
       */

      switch (mode)
      {
      case F_OK:
            return(0);
      case R_OK:
            if ((st.st_mode&(S_IRUSR|S_IRGRP|S_IROTH)) == (S_IRUSR|S_IRGRP|S_IROTH))
                  return(0);
            break;
      case W_OK:
            if (state.path.level && (st.st_mode&(S_IWUSR|S_IWGRP|S_IWOTH)) && !ACCESS(sp, R_OK))
                  return(0);
            break;
      case X_OK:
            if ((st.st_mode&(S_IXUSR|S_IXGRP|S_IXOTH)) == (S_IXUSR|S_IXGRP|S_IXOTH))
                  return(0);
            break;
      }
#if FS
      if (sp)
#endif
      return(ACCESS(sp, mode));
#if FS

      /*
       * simulate access()
       */

      if (mode & (R_OK|W_OK|X_OK))
      {
            test = 0;
            if (st.st_uid == state.uid)
            {
                  if (mode & R_OK) test |= S_IRUSR;
                  if (mode & W_OK) test |= S_IWUSR;
                  if (mode & X_OK) test |= S_IXUSR;
            }
            else if (st.st_gid == state.gid)
            {
                  if (mode & R_OK) test |= S_IRGRP;
                  if (mode & W_OK) test |= S_IWGRP;
                  if (mode & X_OK) test |= S_IXGRP;
            }
            else 
            {
                  if (mode & R_OK) test |= S_IROTH;
                  if (mode & W_OK) test |= S_IWOTH;
                  if (mode & X_OK) test |= S_IXOTH;
            }
            if ((st.st_mode & test) != test)
            {
                  errno = EACCES;
                  return(-1);
            }
      }
      return(0);
#endif
}

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