BSD 4_4_Lite1 release

[unix-history] / usr / src / usr.bin / chpass / util.c

/*-
* 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. 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
static char sccsid[] = "@(#)util.c      8.4 (Berkeley) 4/2/94";
#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"

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 };

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);
       }
       else
               *tbuf = '\0';
       return (tbuf);
} 

int
atot(p, store)
       char *p;
       time_t *store;
{
       static struct tm *lt;
       char *t, **mp;
       time_t tval;
       int day, month, year;

       if (!*p) {
               *store = 0;
               return (0);
       }
       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)
bad:            return (1);
       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;
       return (0);
}

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

       setusershell();
       while (sh = getusershell()) {
               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);
}