head	1.3;
access;
symbols
	version39-45:1.2
	version39-41:1.2;
locks;
comment	@ *  @;


1.3
date	94.06.19.15.14.41;	author rluebbert;	state Exp;
branches;
next	1.2;

1.2
date	92.05.18.12.22.32;	author mwild;	state Exp;
branches;
next	1.1;

1.1
date	92.05.14.19.55.40;	author mwild;	state Exp;
branches;
next	;


desc
@read symbolic link
@


1.3
log
@*** empty log message ***
@
text
@/*
 *  This file is part of ixemul.library for the Amiga.
 *  Copyright (C) 1991, 1992  Markus M. Wild
 *  Portions Copyright (C) 1994 Rafael W. Luebbert
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public
 *  License as published by the Free Software Foundation; either
 *  version 2 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this library; if not, write to the Free
 *  Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *  $Id: readlink.c,v 1.1 1992/05/14 19:55:40 mwild Exp $
 *
 *  $Log: readlink.c,v $
 * Revision 1.1  1992/05/14  19:55:40  mwild
 * Initial revision
 *
 */

#define KERNEL
#include "ixemul.h"

#if __GNUC__ != 2
#define alloca __builtin_alloca
#endif

#ifndef ERROR_IS_SOFT_LINK
#define ERROR_IS_SOFT_LINK  233
#endif

#ifndef ACTION_READ_LINK
#define ACTION_READ_LINK 1024
#endif

struct readlink_vec {
  char *buf;
  int bufsize;
};

static int
__readlink_func (struct StandardPacket *sp, struct MsgPort *handler,
                 BPTR parent_lock,
	         BSTR name,
	         struct readlink_vec *rv, int *no_error)
{
  /* this baby uses CSTRings, absolutely unique... */
  unsigned char *np = BTOCPTR (name);
  np[*np + 1] = 0; np++;

  sp->sp_Pkt.dp_Type = ACTION_READ_LINK;
  sp->sp_Pkt.dp_Arg1 = parent_lock;
  sp->sp_Pkt.dp_Arg2 = (long) np;
  sp->sp_Pkt.dp_Arg3 = (long) rv->buf;
  sp->sp_Pkt.dp_Arg4 = rv->bufsize;

  PutPacket (handler, sp);
  __wait_sync_packet (sp);

  *no_error = sp->sp_Pkt.dp_Res1 > 0;

  /* this *can't* be a symlink... */
  return 0;
}

int 
readlink(char *path, char *buf, int bufsiz)
{
  struct readlink_vec rv;
  struct stat stb;
  int rc;
  
  /* readlink is buggy in the current fs release (37.26 here), in that
     it reports OBJECT_NOT_FOUND if a file is present but not a 
     symbolic link */
  if (lstat (path, &stb) == 0)
    {
      if (S_ISLNK (stb.st_mode))
	{
	  rv.buf = buf;
	  rv.bufsize = bufsiz;
  
	  rc = __plock (path, __readlink_func, &rv);
	  if (rc <= 0)
	    errno = __ioerr_to_errno (IoErr ());
	  return rc > 0 ? rc : -1;
	}
      else
	errno = EINVAL;
    }
  /* errno should be set already by lstat() */
  return -1;
}
@


1.2
log
@set errno, and only send READLINK packet if the file really is a symlink
@
text
@d4 1
@


1.1
log
@Initial revision
@
text
@d19 1
a19 1
 *  $Id$
d21 4
a24 1
 *  $Log$
d76 1
d79 9
a87 2
  rv.buf = buf;
  rv.bufsize = bufsiz;
d89 10
a98 4
  rc = __plock (path, __readlink_func, &rv);
  if (rc <= 0)
    errno = __ioerr_to_errno (IoErr ());
  return rc > 0 ? rc : -1;
@