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/*

FUNCTION

<<rename>>---rename a file

INDEX

        rename

INDEX

        _rename_r

ANSI_SYNOPSIS

        #include <stdio.h>

        int rename(const char *<[old]>, const char *<[new]>);

        int _rename_r(void *<[reent]>,

                      const char *<[old]>, const char *<[new]>);

TRAD_SYNOPSIS

        #include <stdio.h>

        int rename(<[old]>, <[new]>)

        char *<[old]>;

        char *<[new]>;

        int _rename_r(<[reent]>, <[old]>, <[new]>)

        char *<[reent]>;

        char *<[old]>;

        char *<[new]>;

DESCRIPTION

Use <<rename>> to establish a new name (the string at <[new]>) for a

file now known by the string at <[old]>.  After a successful

<<rename>>, the file is no longer accessible by the string at <[old]>.

If <<rename>> fails, the file named <<*<[old]>>> is unaffected.  The

conditions for failure depend on the host operating system.

The alternate function <<_rename_r>> is a reentrant version.  The

extra argument <[reent]> is a pointer to a reentrancy structure.

RETURNS

The result is either <<0>> (when successful) or <<-1>> (when the file

could not be renamed).

PORTABILITY

ANSI C requires <<rename>>, but only specifies that the result on

failure be nonzero.  The effects of using the name of an existing file

as <<*<[new]>>> may vary from one implementation to another.

Supporting OS subroutines required: <<link>>, <<unlink>>, or <<rename>>.

*/

#include <stdio.h>

#include <sys/unistd.h>

#include <reent.h>

int

_rename_r (ptr, old, new)

     struct _reent *ptr;

     _CONST char *old;

     _CONST char *new;

{

#ifdef HAVE_RENAME

  return _rename (old,new);

#else

  if (_link_r (ptr, old, new) == -1)

    return -1;

  if (_unlink_r (ptr, old) == -1)

    {

      /* ??? Should we unlink new? (rhetorical question) */

      return -1;

    }

#endif

  return 0;

}

#ifndef _REENT_ONLY

int

rename (old, new)

     _CONST char *old;

     _CONST char *new;

{

  return _rename_r (_REENT, old, new);

}

#endif