rename.c

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Author : Jim Meyering
Date : 1992-10-31 20:42:48
Hash : d87c3946
Message : Initial revision
lib/rename.c
/* rename.c -- BSD compatible directory function for System V
   Copyright (C) 1988, 1990 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#ifndef STDC_HEADERS
extern int errno;
#endif

#if !defined(S_ISDIR) && defined(S_IFDIR)
#define	S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif

/* Rename file FROM to file TO.
   Return 0 if successful, -1 if not. */

int
rename (from, to)
     char *from;
     char *to;
{
  struct stat from_stats;
  int pid, status;

  if (stat (from, &from_stats))
    return -1;

  if (unlink (to) && errno != ENOENT)
    return -1;

  if (S_ISDIR (from_stats.st_mode))
    {
      /* Need a setuid root process to link and unlink directories. */
      pid = fork ();
      switch (pid)
	{
	case -1:		/* Error. */
	  error (1, errno, "cannot fork");

	case 0:			/* Child. */
	  execl (MVDIR, "mvdir", from, to, (char *) 0);
	  error (255, errno, "cannot run `%s'", MVDIR);

	default:		/* Parent. */
	  while (wait (&status) != pid)
	    /* Do nothing. */ ;

	  errno = 0;		/* mvdir printed the system error message. */
	  if (status)
	    return -1;
	}
    }
  else
    {
      if (link (from, to))
	return -1;
      if (unlink (from) && errno != ENOENT)
	{
	  unlink (to);
	  return -1;
	}
    }
  return 0;
}
kc3-lang/gnulib/lib/rename.c

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