chpass.tproj/util.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*-
  26  * Copyright (c) 1988, 1993, 1994
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58 #include <sys/types.h>
  59
  60 #include <ctype.h>
  61 #include <pwd.h>
  62 #include <stdio.h>
  63 #include <stdlib.h>
  64 #include <string.h>
  65 #include <time.h>
  66 #include <tzfile.h>
  67 #include <unistd.h>
  68
  69 #include "chpass.h"
  70 #include "pathnames.h"
  71
  72 static int dmsize[] =
  73         { -1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  74 static char *months[] =
  75         { "January", "February", "March", "April", "May", "June",
  76           "July", "August", "September", "October", "November",
  77           "December", NULL };
  78
  79 char *
  80 ttoa(tval)
  81         time_t tval;
  82 {
  83         struct tm *tp;
  84         static char tbuf[50];
  85
  86         if (tval) {
  87                 tp = localtime(&tval);
  88                 (void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
  89                     tp->tm_mday, tp->tm_year + TM_YEAR_BASE);
  90         }
  91         else
  92                 *tbuf = '\0';
  93         return (tbuf);
  94 }
  95
  96 int
  97 atot(p, store)
  98         char *p;
  99         time_t *store;
 100 {
 101         static struct tm *lt;
 102         char *t, **mp;
 103         time_t tval;
 104         int day, month, year;
 105
 106         if (!*p) {
 107                 *store = 0;
 108                 return (0);
 109         }
 110         if (!lt) {
 111                 unsetenv("TZ");
 112                 (void)time(&tval);
 113                 lt = localtime(&tval);
 114         }
 115         if (!(t = strtok(p, " \t")))
 116                 goto bad;
 117         for (mp = months;; ++mp) {
 118                 if (!*mp)
 119                         goto bad;
 120                 if (!strncasecmp(*mp, t, 3)) {
 121                         month = mp - months + 1;
 122                         break;
 123                 }
 124         }
 125         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 126                 goto bad;
 127         day = atoi(t);
 128         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 129                 goto bad;
 130         year = atoi(t);
 131         if (day < 1 || day > 31 || month < 1 || month > 12 || !year)
 132                 goto bad;
 133         if (year < 100)
 134                 year += TM_YEAR_BASE;
 135         if (year <= EPOCH_YEAR)
 136 bad:            return (1);
 137         tval = isleap(year) && month > 2;
 138         for (--year; year >= EPOCH_YEAR; --year)
 139                 tval += isleap(year) ?
 140                     DAYSPERLYEAR : DAYSPERNYEAR;
 141         while (--month)
 142                 tval += dmsize[month];
 143         tval += day;
 144         tval = tval * HOURSPERDAY * MINSPERHOUR * SECSPERMIN;
 145         tval -= lt->tm_gmtoff;
 146         *store = tval;
 147         return (0);
 148 }
 149
 150 char *
 151 ok_shell(name)
 152         char *name;
 153 {
 154         char *p, *sh;
 155
 156         setusershell();
 157         while (sh = getusershell()) {
 158                 if (!strcmp(name, sh))
 159                         return (name);
 160                 /* allow just shell name, but use "real" path */
 161                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
 162                         return (sh);
 163         }
 164         return (NULL);
 165 }