util.c revision 1590 
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 <tzfile.h>
47#include <unistd.h>
48
49#include "chpass.h"
50#include "pathnames.h"
51
52static int dmsize[] =
53	{ -1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
54static char *months[] =
55	{ "January", "February", "March", "April", "May", "June",
56	  "July", "August", "September", "October", "November",
57	  "December", NULL };
58
59char *
60ttoa(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
76int
77atot(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)
116bad:		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
130char *
131ok_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}
146