usr.bin/chpass/util.c

   1 /*      $NetBSD: util.c,v 1.11 2003/08/07 11:13:19 agc Exp $    */
   2
   3 /*-
   4  * Copyright (c) 1988, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)util.c      8.4 (Berkeley) 4/2/94";
  36 #else
  37 __RCSID("$NetBSD: util.c,v 1.11 2003/08/07 11:13:19 agc Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <sys/types.h>
  42
  43 #include <ctype.h>
  44 #include <pwd.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <time.h>
  49 #include <tzfile.h>
  50 #include <unistd.h>
  51
  52 #include "chpass.h"
  53 #include "pathnames.h"
  54
  55 char *
  56 ttoa(char *buf, size_t len, time_t tval)
  57 {
  58
  59         if (tval) {
  60                 struct tm *tp = localtime(&tval);
  61
  62                 (void) strftime(buf, len, "%B %d, %Y", tp);
  63                 buf[len - 1] = '\0';
  64         }
  65         else if (len > 0)
  66                 *buf = '\0';
  67         return (buf);
  68 }
  69
  70 int
  71 atot(const char *p, time_t *store)
  72 {
  73         static struct tm *lt;
  74         struct tm tm;
  75         char *t;
  76         time_t tval;
  77
  78         if (!*p) {
  79                 *store = 0;
  80                 return (0);
  81         }
  82         if (!lt) {
  83                 unsetenv("TZ");
  84                 (void)time(&tval);
  85                 lt = localtime(&tval);
  86         }
  87         (void) memset(&tm, 0, sizeof(tm));
  88         while ((t = strchr(p, ',')) != NULL)
  89                 *t = ' ';
  90         t = strptime(p, "%B %d %Y", &tm);
  91         if (t == NULL || (*t != '\0' && *t != '\n'))
  92                 return 1;
  93         if ((*store = mktime(&tm)) == (time_t) -1)
  94                 return 1;
  95         return (0);
  96 }
  97
  98 const char *
  99 ok_shell(const char *name)
 100 {
 101         char *p;
 102         const char *sh;
 103
 104         setusershell();
 105         while ((sh = getusershell()) != NULL) {
 106                 if (!strcmp(name, sh))
 107                         return (name);
 108                 /* allow just shell name, but use "real" path */
 109                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
 110                         return (sh);
 111         }
 112         return (NULL);
 113 }