util.c revision 93086 
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
35static const char sccsid[] = "@(#)util.c	8.4 (Berkeley) 4/2/94";
36#endif /* not lint */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD: head/usr.bin/chpass/util.c 93086 2002-03-24 10:21:22Z markm $");
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 <unistd.h>
50
51#include "chpass.h"
52#include "pathnames.h"
53
54static const char *months[] =
55	{ "January", "February", "March", "April", "May", "June",
56	  "July", "August", "September", "October", "November",
57	  "December", NULL };
58
59char *
60ttoa(time_t tval)
61{
62	struct tm *tp;
63	static char tbuf[50];
64
65	if (tval) {
66		tp = localtime(&tval);
67		(void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
68		    tp->tm_mday, tp->tm_year + 1900);
69	}
70	else
71		*tbuf = '\0';
72	return (tbuf);
73}
74
75int
76atot(char *p, time_t *store)
77{
78	static struct tm *lt;
79	char *t;
80	const char **mp;
81	time_t tval;
82	int day, month, year;
83
84	if (!*p) {
85		*store = 0;
86		return (0);
87	}
88	if (!lt) {
89		unsetenv("TZ");
90		(void)time(&tval);
91		lt = localtime(&tval);
92	}
93	if (!(t = strtok(p, " \t")))
94		goto bad;
95	if (isdigit(*t)) {
96		month = atoi(t);
97	} else {
98		for (mp = months;; ++mp) {
99			if (!*mp)
100				goto bad;
101			if (!strncasecmp(*mp, t, 3)) {
102				month = mp - months + 1;
103				break;
104			}
105		}
106	}
107	if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
108		goto bad;
109	day = atoi(t);
110	if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
111		goto bad;
112	year = atoi(t);
113	if (day < 1 || day > 31 || month < 1 || month > 12)
114		goto bad;
115	/* Allow two digit years 1969-2068 */
116	if (year < 69)
117		year += 2000;
118	else if (year < 100)
119		year += 1900;
120	if (year < 1969)
121bad:		return (1);
122	lt->tm_year = year - 1900;
123	lt->tm_mon = month - 1;
124	lt->tm_mday = day;
125	lt->tm_hour = 0;
126	lt->tm_min = 0;
127	lt->tm_sec = 0;
128	lt->tm_isdst = -1;
129	if ((tval = mktime(lt)) < 0)
130		return (1);
131	*store = tval;
132	return (0);
133}
134
135char *
136ok_shell(char *name)
137{
138	char *p, *sh;
139
140	setusershell();
141	while ((sh = getusershell())) {
142		if (!strcmp(name, sh))
143			return (name);
144		/* allow just shell name, but use "real" path */
145		if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
146			return (sh);
147	}
148	return (NULL);
149}
150