/*
 * Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.
 *      All rights reserved.
 * Copyright (c) 1997 Eric P. Allman.  All rights reserved.
 * Copyright (c) 1988, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 *
 */

#include <sendmail.h>

SM_RCSID("@(#)$Id: snprintf.c,v 8.41 2001/08/28 23:07:01 gshapiro Exp $")

/*
**  SHORTENSTRING -- return short version of a string
**
**      If the string is already short, just return it.  If it is too
**      long, return the head and tail of the string.
**
**      Parameters:
**              s -- the string to shorten.
**              m -- the max length of the string (strlen()).
**
**      Returns:
**              Either s or a short version of s.
*/

char *
shortenstring(s, m)
        register const char *s;
        size_t m;
{
        size_t l;
        static char buf[MAXSHORTSTR + 1];

        l = strlen(s);
        if (l < m)
                return (char *) s;
        if (m > MAXSHORTSTR)
                m = MAXSHORTSTR;
        else if (m < 10)
        {
                if (m < 5)
                {
                        (void) sm_strlcpy(buf, s, m + 1);
                        return buf;
                }
                (void) sm_strlcpy(buf, s, m - 2);
                (void) sm_strlcat(buf, "...", sizeof buf);
                return buf;
        }
        m = (m - 3) / 2;
        (void) sm_strlcpy(buf, s, m + 1);
        (void) sm_strlcat2(buf, "...", s + l - m, sizeof buf);
        return buf;
}