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truncate3d.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"

#ifdef truncate3d

#if !_nosys_truncate64 && _typ_off64_t

#undef      off_t
#undef      ftruncate

typedef int (*Real_f)(const char*, off64_t);

int
truncate643d(const char* path, off64_t size)
{
      register char*    sp;
      register int      r;
      int         n;
      int         m;
      static Real_f     realf;
#if FS
      Mount_t*    mp;

      if (!fscall(NiL, MSG_truncate, 0, path, size))
            return state.ret;
      mp = monitored();
#endif
      if (!(sp = pathreal(path, P_TOP, NiL)))
            return -1;
      if (!realf)
            realf = (Real_f)sysfunc(SYS3D_truncate64);
      for (m = state.trap.size - 1; m >= 0; m--)
            if (MSG_MASK(MSG_truncate) & state.trap.intercept[m].mask)
                  break;
      if (m >= 0)
      {
            n = state.trap.size;
            state.trap.size = m;
            r = (*state.trap.intercept[m].call)(&state.trap.intercept[m], MSG_truncate, SYS3D_truncate64, (void*)sp, (void*)&size, NiL, NiL, NiL, NiL);
            state.trap.size = n;
      }
      else
            r = (*realf)(sp, size);
#if FS
      if (!r)
      {
            if (mp)
                  fscall(mp, MSG_truncate, 0, path, size);
            for (mp = state.global; mp; mp = mp->global)
                  if (fssys(mp, MSG_truncate))
                        fscall(NiL, MSG_truncate, 0, path, size);
      }
#endif
      return r;
}

#endif

int
truncate3d(const char* path, off_t size)
{
      register char*    sp;
      register int      r;
#if FS
      Mount_t*    mp;

      if (!fscall(NiL, MSG_truncate, 0, path, size))
            return state.ret;
      mp = monitored();
#endif
      if (!(sp = pathreal(path, P_TOP, NiL)))
            return -1;
      r = TRUNCATE(sp, size);
#if FS
      if (!r)
      {
            if (mp)
                  fscall(NiL, MSG_truncate, 0, path, size);
            for (mp = state.global; mp; mp = mp->global)
                  if (fssys(mp, MSG_truncate))
                        fscall(NiL, MSG_truncate, 0, path, size);
      }
#endif
      return r;
}

#else

NoN(truncate)

#endif

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