usr/src/contrib/ed/line_number.c

/*-
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rodney Ruddock of the University of Guelph.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)line_number.c       8.1 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>

#include <regex.h>
#include <setjmp.h>
#include <stdio.h>

#ifdef DBI
#include <db.h>
#endif

#include "ed.h"
#include "extern.h"

/*
 * Converts a LINE to a line number (int) that can be printed to
 * the device the user is at. Used by n and =.
 */
int
line_number(line_addr)
        LINE *line_addr;
{
        LINE *l_temp1;
        int l_cnt = 1;          /* yes! =1 */

        l_temp1 = top;
        if ((line_addr == NULL) && (top == NULL))
                return (0);

        for (;;) {
                if (line_addr == l_temp1)
                        break;
                l_temp1 = l_temp1->below;
                l_cnt++;
        }
        return (l_cnt);
}