/* arg.c: ARGUMENT LISTS
 *
 * $Id: //info.ravenbrook.com/project/mps/custom/cet/main/code/bt.c#1 $
 * Copyright (c) 2013 Ravenbrook Limited.  See end of file for license.
 */

#include "config.h"
#include "check.h"
#include "mpm.h"

SRCID(arg, "$Id$");

#define KeySig          ((Sig)0x519CE333) /* SIGnature KEYyy */
typedef struct mps_key_s {
  Sig sig;
  const char *name;
  Bool (*check)(Arg arg);
} KeyStruct;


static Bool ArgCheckCant(Arg arg) {
  UNUSED(arg);
  return TRUE;
}

const KeyStruct _mps_key_varargs = {KeySig, "VARARGS", ArgCheckCant};


/* KeyCheck -- check the validity of an argument key */

Bool KeyCheck(Key key)
{
  CHECKS(Key, key);
  CHECKL(key->name != NULL);
  CHECKL(FUNCHECK(key->check));
  return TRUE;
}


Bool ArgCheck(Arg arg)
{
  CHECKL(arg != NULL);
  CHECKD(Key, arg->key);
  CHECKL(arg->key->check(arg));
  return TRUE;
}


/* ArgCheck -- check the validity of an argument list */

Bool ArgListCheck(ArgList args)
{
  Index i;
  CHECKL(args != NULL);
  /* FIXME: Maximum plausible length? */
  for (i = 0; args[i].key != MPS_KEY_ARGS_END; ++i)
    CHECKL(ArgCheck(&args[i]));
  return TRUE;
}


Bool ArgPick(mps_arg_s *argOut, mps_arg_s args[], Key key) {
  Index i;
  
  AVER(argOut != NULL);
  AVERT(Arg, args);
  AVERT(Key, key);

  for (i = 0; args[i].key != MPS_KEY_ARGS_END; ++i)
    if (args[i].key == key)
      goto found;
  return FALSE;

found:
  *argOut = args[i];
  for(;;) {
    args[i] = args[i + 1];
    if (args[i].key == MPS_KEY_ARGS_END)
      break;
    ++i;
  }

  return TRUE;
}


/* C. COPYRIGHT AND LICENSE
 *
 * Copyright (C) 2001-2002 Ravenbrook Limited <http://www.ravenbrook.com/>.
 * All rights reserved.  This is an open source license.  Contact
 * Ravenbrook for commercial licensing options.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * 3. Redistributions in any form must be accompanied by information on how
 * to obtain complete source code for this software and any accompanying
 * software that uses this software.  The source code must either be
 * included in the distribution or be available for no more than the cost
 * of distribution plus a nominal fee, and must be freely redistributable
 * under reasonable conditions.  For an executable file, complete source
 * code means the source code for all modules it contains. It does not
 * include source code for modules or files that typically accompany the
 * major components of the operating system on which the executable file
 * runs.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, OR NON-INFRINGEMENT, ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */