NetBSD/usr.bin/chpass/util.c

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/* $NetBSD: util.c,v 1.4 1995/03/26 04:55:35 glass Exp $ */
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/*-
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* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
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*
* 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 THE REGENTS 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
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#if 0
static char sccsid[] = "@(#)util.c 8.4 (Berkeley) 4/2/94";
#else
static char rcsid[] = "$NetBSD: util.c,v 1.4 1995/03/26 04:55:35 glass Exp $";
#endif
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#endif /* not lint */
#include <sys/types.h>
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#include <ctype.h>
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#include <pwd.h>
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
#include <tzfile.h>
#include <unistd.h>
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#include "chpass.h"
#include "pathnames.h"
static int dmsize[] =
{ -1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
static char *months[] =
{ "January", "February", "March", "April", "May", "June",
"July", "August", "September", "October", "November",
"December", NULL };
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char *
ttoa(tval)
time_t tval;
{
struct tm *tp;
static char tbuf[50];
if (tval) {
tp = localtime(&tval);
(void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
tp->tm_mday, tp->tm_year + TM_YEAR_BASE);
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}
else
*tbuf = '\0';
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return (tbuf);
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}
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int
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atot(p, store)
char *p;
time_t *store;
{
static struct tm *lt;
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char *t, **mp;
time_t tval;
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int day, month, year;
if (!*p) {
*store = 0;
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return (0);
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}
if (!lt) {
unsetenv("TZ");
(void)time(&tval);
lt = localtime(&tval);
}
if (!(t = strtok(p, " \t")))
goto bad;
for (mp = months;; ++mp) {
if (!*mp)
goto bad;
if (!strncasecmp(*mp, t, 3)) {
month = mp - months + 1;
break;
}
}
if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
goto bad;
day = atoi(t);
if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
goto bad;
year = atoi(t);
if (day < 1 || day > 31 || month < 1 || month > 12 || !year)
goto bad;
if (year < 100)
year += TM_YEAR_BASE;
if (year <= EPOCH_YEAR)
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bad: return (1);
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tval = isleap(year) && month > 2;
for (--year; year >= EPOCH_YEAR; --year)
tval += isleap(year) ?
DAYSPERLYEAR : DAYSPERNYEAR;
while (--month)
tval += dmsize[month];
tval += day;
tval = tval * HOURSPERDAY * MINSPERHOUR * SECSPERMIN;
tval -= lt->tm_gmtoff;
*store = tval;
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return (0);
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}
char *
ok_shell(name)
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char *name;
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{
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char *p, *sh;
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setusershell();
while (sh = getusershell()) {
if (!strcmp(name, sh))
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return (name);
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/* allow just shell name, but use "real" path */
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if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
return (sh);
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}
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return (NULL);
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}