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rename.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1985-2007 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>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <ast.h>

#if _lib_rename

NoN(rename)

#else

#include <error.h>
#include <proc.h>

#ifdef EPERM

static int
mvdir(const char* from, const char* to)
{
      char*             argv[4];
      int               oerrno;

      static const char mvdir[] = "/usr/lib/mv_dir";

      oerrno = errno;
      if (!eaccess(mvdir, X_OK))
      {
            argv[0] = mvdir;
            argv[1] = from;
            argv[2] = to;
            argv[3] = 0;
            if (!procrun(argv[0], argv, 0))
            {
                  errno = oerrno;
                  return 0;
            }
      }
      errno = EPERM;
      return -1;
}

#endif

int
rename(const char* from, const char* to)
{
      int   oerrno;
      int   ooerrno;

      ooerrno = errno;
      while (link(from, to))
      {
#ifdef EPERM
            if (errno == EPERM)
            {
                  errno = ooerrno;
                  return mvdir(from, to);
            }
#endif
            oerrno = errno;
            if (unlink(to))
            {
#ifdef EPERM
                  if (errno == EPERM)
                  {
                        errno = ooerrno;
                        return mvdir(from, to);
                  }
#endif
                  errno = oerrno;
                  return -1;
            }
      }
      errno = ooerrno;
      return unlink(from);
}

#endif

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