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/* Reentrant version of rename system call.  */

#include <reent.h>

#include <unistd.h>

#include <sys/stat.h>

#include <_syslist.h>

/* Some targets provides their own versions of these functions.  Those

   targets should define REENTRANT_SYSCALLS_PROVIDED in TARGET_CFLAGS.  */

#ifdef _REENT_ONLY

#ifndef REENTRANT_SYSCALLS_PROVIDED

#define REENTRANT_SYSCALLS_PROVIDED

#endif

#endif

#ifndef REENTRANT_SYSCALLS_PROVIDED

/* We use the errno variable used by the system dependent layer.  */

#undef errno

extern int errno;

/*

FUNCTION

        <<_rename_r>>---Reentrant version of rename

INDEX

        _rename_r

ANSI_SYNOPSIS

        #include <reent.h>

        int _rename_r(struct _reent *<[ptr]>,

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

TRAD_SYNOPSIS

        #include <reent.h>

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

        struct _reent *<[ptr]>;

        char *<[old]>;

        char *<[new]>;

DESCRIPTION

        This is a reentrant version of <<rename>>.  It

        takes a pointer to the global data block, which holds

        <<errno>>.

*/

int

_DEFUN (_rename_r, (ptr, old, new),

     struct _reent *ptr _AND

     _CONST char *old _AND

     _CONST char *new)

{

  int ret = 0;

#ifdef HAVE_RENAME

  errno = 0;

  if ((ret = _rename (old, new)) == -1 && errno != 0)

    ptr->_errno = errno;

#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 ret;

}

#endif /* ! defined (REENTRANT_SYSCALLS_PROVIDED) */