/*

 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")

 * Copyright (c) 1996,1999 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.

 */

/* Import. */

#include <arpa/nameser.h>

#include <ctype.h>

#include <errno.h>

#include <stdio.h>

#include <string.h>

#ifdef SPRINTF_CHAR

# define SPRINTF(x) strlen(sprintf/**/x)

#else

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

#endif

/* 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 = src % 60;   src /= 60;

	mins = src % 60;   src /= 60;

	hours = src % 24;  src /= 24;

	days = src % 7;    src /= 7;

	weeks = 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 = tolower(ch);

	}

	return (dst - odst);

}

libresolv_hidden_def (ns_format_ttl)

// Seems not to be needed.  It's not exported from the DSO.  Some libresolv.a

// might depend on it so we let it in.

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;

	} else if (!dirty)

		goto einval;

	*dst = ttl;

	return (0);

 einval:

	__set_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);

}

/*! \file */