usr/othersrc/contrib/isode/psap/seq_add.c

/* seq_add.c - add an element to a sequence */

#ifndef lint
static char *rcsid = "$Header: /f/osi/psap/RCS/seq_add.c,v 7.1 91/02/22 09:36:51 mrose Interim $";
#endif

/*
 * $Header: /f/osi/psap/RCS/seq_add.c,v 7.1 91/02/22 09:36:51 mrose Interim $
 *
 *
 * $Log:        seq_add.c,v $
 * Revision 7.1  91/02/22  09:36:51  mrose
 * Interim 6.8
 *
 * Revision 7.0  89/11/23  22:13:35  mrose
 * Release 6.0
 *
 */

/*
 *                                NOTICE
 *
 *    Acquisition, use, and distribution of this module and related
 *    materials are subject to the restrictions of a license agreement.
 *    Consult the Preface in the User's Manual for the full terms of
 *    this agreement.
 *
 */


/* LINTLIBRARY */

#include <stdio.h>
#include "psap.h"

/* \f */

int     seq_add (pe, r, i)
register PE     pe,
                r;
register int    i;
{
    register PE    *p,
                    q;

    if (r == NULLPE)
        return pe_seterr (pe, PE_ERR_NMEM, NOTOK);

    if (i < 0)
        i = pe -> pe_cardinal;
    for (p = &pe -> pe_cons; q = *p; p = &q -> pe_next)
        if (q -> pe_offset == i) {
            r -> pe_next = q -> pe_next;
            pe_free (q);
            break;
        }
        else
            if (q -> pe_offset > i) {
                r -> pe_next = q;
                break;
            }

    *p = r;
    if ((r -> pe_offset = i) >= pe -> pe_cardinal)
        pe -> pe_cardinal = i + 1;

    return OK;
}