/*
    (C) 1995-96 AROS - The Amiga Replacement OS
    $Id: remhead.c,v 1.9 1997/01/01 03:46:14 ldp Exp $
    $Log: remhead.c,v $
    Revision 1.9  1997/01/01 03:46:14  ldp
    Committed Amiga native (support) code

    Changed clib to proto

    Revision 1.8  1996/12/10 13:51:51  aros
    Moved all #include's in the first column so makedepend can see it.

    Revision 1.7  1996/10/24 15:50:55  aros
    Use the official AROS macros over the __AROS versions.

    Revision 1.6  1996/10/21 20:48:22  aros
    Changed struct SysBase to struct ExecBase

    Revision 1.5  1996/08/13 13:56:06  digulla
    Replaced AROS_LA by AROS_LHA
    Replaced some AROS_LH*I by AROS_LH*
    Sorted and added includes

    Revision 1.4  1996/08/01 17:41:16  digulla
    Added standard header for all files

    Desc:
    Lang: english
*/

/* I want the macros */
#define AROS_ALMOST_COMPATIBLE
#include "exec_intern.h"
#include <exec/lists.h>
#include <proto/exec.h>

/*****************************************************************************

    NAME */

	AROS_LH1I(struct Node *, RemHead,

/*  SYNOPSIS */
	AROS_LHA(struct List *, list, A0),

/*  LOCATION */
	struct ExecBase *, SysBase, 43, Exec)

/*  FUNCTION
	Remove the first node from a list.

    INPUTS
	list - Remove the node from this list

    RESULT
	The node that has been removed.

    NOTES

    EXAMPLE
	struct List * list;
	struct Node * head;

	// Remove node and return it
	head = RemHead (list);

    BUGS

    SEE ALSO

    INTERNALS

    HISTORY
	26-08-95    digulla created after EXEC-Routine
	26-10-95    digulla adjusted to new calling scheme

******************************************************************************/
{
    AROS_LIBFUNC_INIT
    struct Node * node;

    assert (list);
    /*
	Unfortunately, there is no (quick) check that the node
	is in a list
    */

    /* Get the address of the first node or NULL */
    node = list->lh_Head->ln_Succ;
    if (node)
    {
	node->ln_Pred = (struct Node *)list;
	node = list->lh_Head;
	list->lh_Head = node->ln_Succ;
    }

    /* Return the address or NULL */
    return node;
    AROS_LIBFUNC_EXIT
} /* RemHead */