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*
*                            Open Watcom Project
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*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


//
// CHAIN        : chain processing
//

#include "ftnstd.h"

extern  void                    FMemFree(void *);


void    FreeChain( void **head ) {
//================================

// Free a chain.
// The "link" field in the chain must be first in the structure.

    void        *next;
    void        **chain;

    chain = *head;
    while( chain != NULL ) {
        next = *chain;
        FMemFree( chain );
        chain = next;
    }
    *head = NULL;
}


void    *FreeLink( void **link ) {
//================================

// Free a link in the chain.
// The "link" field in the chain must be first in the structure.

    void        *next;

    next = *link;
    FMemFree( link );
    return( next );
}


void    ReverseList( void **head ) {
//==================================

// Reverse a linked list.

    void        *rev_list;
    void        *next;
    void        **entry;

    rev_list = NULL;
    entry = *head;
    while( entry != NULL ) {
        next = *entry;
        *entry = rev_list;
        rev_list = entry;
        entry = next;
    }
    *head = rev_list;
}
