util.c revision 17544 
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 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 <unistd.h>
47
48#include "chpass.h"
49#include "pathnames.h"
50
51static char *months[] =
52	{ "January", "February", "March", "April", "May", "June",
53	  "July", "August", "September", "October", "November",
54	  "December", NULL };
55
56char *
57ttoa(tval)
58	time_t tval;
59{
60	struct tm *tp;
61	static char tbuf[50];
62
63	if (tval) {
64		tp = localtime(&tval);
65		(void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
66		    tp->tm_mday, tp->tm_year + 1900);
67	}
68	else
69		*tbuf = '\0';
70	return (tbuf);
71}
72
73int
74atot(p, store)
75	char *p;
76	time_t *store;
77{
78	static struct tm *lt;
79	char *t, **mp;
80	time_t tval;
81	int day, month, year;
82
83	if (!*p) {
84		*store = 0;
85		return (0);
86	}
87	if (!lt) {
88		unsetenv("TZ");
89		(void)time(&tval);
90		lt = localtime(&tval);
91	}
92	if (!(t = strtok(p, " \t")))
93		goto bad;
94	if (isdigit(*t)) {
95		month = atoi(t);
96	} else {
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	}
106	if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
107		goto bad;
108	day = atoi(t);
109	if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
110		goto bad;
111	year = atoi(t);
112	if (day < 1 || day > 31 || month < 1 || month > 12 || !year)
113		goto bad;
114	if (year < 100)
115		year += 1900;
116	if (year <= 1970)
117bad:		return (1);
118	lt->tm_year = year - 1900;
119	lt->tm_mon = month - 1;
120	lt->tm_mday = day;
121	lt->tm_hour = 0;
122	lt->tm_min = 0;
123	lt->tm_sec = 0;
124	lt->tm_isdst = -1;
125	if ((tval = mktime(lt)) < 0)
126		return (1);
127	*store = tval;
128	return (0);
129}
130
131char *
132ok_shell(name)
133	char *name;
134{
135	char *p, *sh;
136
137	setusershell();
138	while (sh = getusershell()) {
139		if (!strcmp(name, sh))
140			return (name);
141		/* allow just shell name, but use "real" path */
142		if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
143			return (sh);
144	}
145	return (NULL);
146}
147