StdLib/BsdSocketLib/ns_ttl.c

/*
 * Copyright (c) 1996 by Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

/*
 * Portions copyright (c) 1999, 2000
 * Intel Corporation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *
 *    This product includes software developed by Intel Corporation and
 *    its contributors.
 *
 * 4. Neither the name of Intel Corporation or its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY INTEL CORPORATION AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL INTEL CORPORATION OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef lint
static char rcsid[] = "$Id: ns_ttl.c,v 1.1.1.1 2003/11/19 01:51:34 kyu3 Exp $";
#endif

/* Import. */

#include <arpa/nameser.h>

#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>

#define SPRINTF(x) ((size_t)sprintf x)

/* Forward. */

static int  fmt1(int t, char s, char **buf, size_t *buflen);

/* Macros. */

#define T(x) if ((x) < 0) return (-1); else (void)NULL

/* Public. */

int
ns_format_ttl(u_long src, char *dst, size_t dstlen) {
    char *odst = dst;
    int secs, mins, hours, days, weeks, x;
    char *p;

    secs =  (int)(src % 60);  src /= 60;
    mins =  (int)(src % 60);  src /= 60;
    hours = (int)(src % 24);  src /= 24;
    days =  (int)(src % 7);   src /= 7;
    weeks = (int)src;         src = 0;

    x = 0;
    if (weeks) {
        T(fmt1(weeks, 'W', &dst, &dstlen));
        x++;
    }
    if (days) {
        T(fmt1(days, 'D', &dst, &dstlen));
        x++;
    }
    if (hours) {
        T(fmt1(hours, 'H', &dst, &dstlen));
        x++;
    }
    if (mins) {
        T(fmt1(mins, 'M', &dst, &dstlen));
        x++;
    }
    if (secs || !(weeks || days || hours || mins)) {
        T(fmt1(secs, 'S', &dst, &dstlen));
        x++;
    }

    if (x > 1) {
        int ch;

        for (p = odst; (ch = *p) != '\0'; p++)
            if (isascii(ch) && isupper(ch))
                *p = (char)( tolower(ch));
    }

    return ((int)(dst - odst));
}

int
ns_parse_ttl(const char *src, u_long *dst) {
    u_long ttl, tmp;
    int ch, digits, dirty;

    ttl = 0;
    tmp = 0;
    digits = 0;
    dirty = 0;
    while ((ch = *src++) != '\0') {
        if (!isascii(ch) || !isprint(ch))
            goto einval;
        if (isdigit(ch)) {
            tmp *= 10;
            tmp += (ch - '0');
            digits++;
            continue;
        }
        if (digits == 0)
            goto einval;
        if (islower(ch))
            ch = toupper(ch);
        switch (ch) {
        case 'W':  tmp *= 7;
        case 'D':  tmp *= 24;
        case 'H':  tmp *= 60;
        case 'M':  tmp *= 60;
        case 'S':  break;
        default:   goto einval;
        }
        ttl += tmp;
        tmp = 0;
        digits = 0;
        dirty = 1;
    }
    if (digits > 0) {
        if (dirty)
            goto einval;
        else
            ttl += tmp;
    }
    *dst = ttl;
    return (0);

 einval:
    errno = EINVAL;
    return (-1);
}

/* Private. */

static int
fmt1(int t, char s, char **buf, size_t *buflen) {
    char tmp[50];
    size_t len;

    len = SPRINTF((tmp, "%d%c", t, s));
    if (len + 1 > *buflen)
        return (-1);
    strcpy(*buf, tmp);
    *buf += len;
    *buflen -= len;
    return (0);
}