ring.c

/*
# _____     ___ ____     ___ ____
#  ____|   |    ____|   |        | |____|
# |     ___|   |____ ___|    ____| |    \    PS2DEV Open Source Project.
#-----------------------------------------------------------------------
# Copyright ps2dev - http://www.ps2dev.org
# Licenced under Academic Free License version 2.0
# Review ps2sdk README & LICENSE files for further details.
*/
 
#include "srxfixup_internal.h"
 
SLink *add_ring_top(SLink *tailp, SLink *elementp)
{
    if ( !elementp )
    {
        return tailp;
    }
    if ( tailp )
    {
        elementp->next = tailp->next;
        tailp->next = elementp;
    }
    else
    {
        tailp = elementp;
        elementp->next = elementp;
    }
    return tailp;
}
 
SLink *add_ring_tail(SLink *tailp, SLink *elementp)
{
    SLink *tailpa;
 
    tailpa = add_ring_top(tailp, elementp);
    if ( !elementp )
    {
        return tailpa;
    }
    if ( tailpa )
    {
        return tailpa->next;
    }
    return 0;
}
 
SLink *joint_ring(SLink *tailp, SLink *otherring)
{
    SLink *othertop;
 
    if ( !otherring )
    {
        return tailp;
    }
    if ( !tailp )
    {
        return otherring;
    }
    othertop = otherring->next;
    otherring->next = tailp->next;
    tailp->next = othertop;
    return tailp;
}
 
SLink *ring_to_liner(SLink *tailp)
{
    SLink *top;
 
    if ( !tailp )
    {
        return 0;
    }
    top = tailp->next;
    tailp->next = 0;
    return top;
}