/*      $NetBSD: util.c,v 1.12 2005/02/17 17:09:48 xtraeme Exp $        */

/*-
* Copyright (c) 1988, 1993, 1994
*      The Regents of the University of California.  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. 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.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)util.c      8.4 (Berkeley) 4/2/94";
#else
__RCSID("$NetBSD: util.c,v 1.12 2005/02/17 17:09:48 xtraeme Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>

#include <ctype.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <tzfile.h>
#include <unistd.h>

#include "chpass.h"
#include "pathnames.h"

char *
ttoa(char *buf, size_t len, time_t tval)
{

       if (tval) {
               struct tm *tp = localtime(&tval);

               (void) strftime(buf, len, "%B %d, %Y", tp);
               buf[len - 1] = '\0';
       }
       else if (len > 0)
               *buf = '\0';
       return (buf);
}

int
atot(const char *p, time_t *store)
{
       static struct tm *lt;
       struct tm tm;
       char *t;
       time_t tval;

       if (!*p) {
               *store = 0;
               return (0);
       }
       if (!lt) {
               unsetenv("TZ");
               (void)time(&tval);
               lt = localtime(&tval);
       }
       (void) memset(&tm, 0, sizeof(tm));
       while ((t = strchr(p, ',')) != NULL)
               *t = ' ';
       t = strptime(p, "%B %d %Y", &tm);
       if (t == NULL || (*t != '\0' && *t != '\n'))
               return 1;
       if ((*store = mktime(&tm)) == (time_t) -1)
               return 1;
       return (0);
}

const char *
ok_shell(const char *name)
{
       char *p;
       const char *sh;

       setusershell();
       while ((sh = getusershell()) != NULL) {
               if (!strcmp(name, sh))
                       return (name);
               /* allow just shell name, but use "real" path */
               if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
                       return (sh);
       }
       return (NULL);
}