chpass/util.c

   1 /*-
   2  * Copyright (c) 1988, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static char sccsid[] = "@(#)util.c      8.4 (Berkeley) 4/2/94";
  36 #endif /* not lint */
  37
  38 #include <sys/types.h>
  39
  40 #include <ctype.h>
  41 #include <pwd.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <time.h>
  46 #include <tzfile.h>
  47 #include <unistd.h>
  48
  49 #include "chpass.h"
  50 #include "pathnames.h"
  51
  52 static int dmsize[] =
  53         { -1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  54 static char *months[] =
  55         { "January", "February", "March", "April", "May", "June",
  56           "July", "August", "September", "October", "November",
  57           "December", NULL };
  58
  59 char *
  60 ttoa(tval)
  61         time_t tval;
  62 {
  63         struct tm *tp;
  64         static char tbuf[50];
  65
  66         if (tval) {
  67                 tp = localtime(&tval);
  68                 (void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
  69                     tp->tm_mday, tp->tm_year + TM_YEAR_BASE);
  70         }
  71         else
  72                 *tbuf = '\0';
  73         return (tbuf);
  74 }
  75
  76 int
  77 atot(p, store)
  78         char *p;
  79         time_t *store;
  80 {
  81         static struct tm *lt;
  82         char *t, **mp;
  83         time_t tval;
  84         int day, month, year;
  85
  86         if (!*p) {
  87                 *store = 0;
  88                 return (0);
  89         }
  90         if (!lt) {
  91                 unsetenv("TZ");
  92                 (void)time(&tval);
  93                 lt = localtime(&tval);
  94         }
  95         if (!(t = strtok(p, " \t")))
  96                 goto bad;
  97         for (mp = months;; ++mp) {
  98                 if (!*mp)
  99                         goto bad;
 100                 if (!strncasecmp(*mp, t, 3)) {
 101                         month = mp - months + 1;
 102                         break;
 103                 }
 104         }
 105         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 106                 goto bad;
 107         day = atoi(t);
 108         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 109                 goto bad;
 110         year = atoi(t);
 111         if (day < 1 || day > 31 || month < 1 || month > 12 || !year)
 112                 goto bad;
 113         if (year < 100)
 114                 year += TM_YEAR_BASE;
 115         if (year <= EPOCH_YEAR)
 116 bad:            return (1);
 117         tval = isleap(year) && month > 2;
 118         for (--year; year >= EPOCH_YEAR; --year)
 119                 tval += isleap(year) ?
 120                     DAYSPERLYEAR : DAYSPERNYEAR;
 121         while (--month)
 122                 tval += dmsize[month];
 123         tval += day;
 124         tval = tval * HOURSPERDAY * MINSPERHOUR * SECSPERMIN;
 125         tval -= lt->tm_gmtoff;
 126         *store = tval;
 127         return (0);
 128 }
 129
 130 char *
 131 ok_shell(name)
 132         char *name;
 133 {
 134         char *p, *sh;
 135
 136         setusershell();
 137         while (sh = getusershell()) {
 138                 if (!strcmp(name, sh))
 139                         return (name);
 140                 /* allow just shell name, but use "real" path */
 141                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
 142                         return (sh);
 143         }
 144         return (NULL);
 145 }