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readlink3d.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1989-2007 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>                   *
*                   Eduardo Krell <ekrell@adexus.cl>                   *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include "3d.h"

ssize_t
readlink3d(const char* path, char* buf, register size_t size)
{
      size_t            r;
#if FS
      Mount_t*    mp;
#endif

      if (state.in_2d)
            return(READLINK(path, buf, size));
#if FS
      if (!fscall(NiL, MSG_readlink, 0, path, buf, size))
            return(state.ret);
      mp = monitored();
#endif
      if (!pathreal(path, P_READLINK, NiL))
            return(-1);

      /*
       * see if link text is already in memory
       */

      if (r = state.path.linksize)
      {
            if (r > state.path.linksize)
                  r = state.path.linksize;
            memcpy(buf, state.path.linkname, r);
#if FS
            if (mp) fscall(mp, MSG_readlink, r, path, buf, size);
            for (mp = state.global; mp; mp = mp->global)
                  if (fssys(mp, MSG_readlink))
                        fscall(mp, MSG_readlink, r, path, buf, size);
#endif
            return(r);
      }

      /*
       * exists but not a symbolic link
       */

      errno = EINVAL;
      return(-1);
}

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