stime.c revision 1.5 
1/*	$NetBSD: stime.c,v 1.5 2005/11/26 13:57:27 tsutsui Exp $	*/
2
3/*
4 * Copyright (c) 1993
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__COPYRIGHT("@(#) Copyright (c) 1993\n\
35	The Regents of the University of California.  All rights reserved.\n");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "from: @(#)touch.c	8.2 (Berkeley) 4/28/95";
41#endif
42__RCSID("$NetBSD: stime.c,v 1.5 2005/11/26 13:57:27 tsutsui Exp $");
43#endif /* not lint */
44
45
46#include <err.h>
47#include <string.h>
48#include <time.h>
49#include <tzfile.h>
50
51#include "stime.h"
52
53#define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
54
55time_t
56stime(char *arg)
57{
58	struct tm *t;
59	time_t tmptime;
60	int yearset;
61	char *p;
62					/* Start with the current time. */
63	if (time(&tmptime) == (time_t)-1)
64		err(1, "time");
65
66	if ((t = localtime(&tmptime)) == NULL)
67		err(1, "localtime");
68					/* [[CC]YY]MMDDhhmm[.SS] */
69	if ((p = strchr(arg, '.')) == NULL)
70		t->tm_sec = 0;		/* Seconds defaults to 0. */
71	else {
72		if (strlen(p + 1) != 2)
73			goto terr;
74		*p++ = '\0';
75		t->tm_sec = ATOI2(p);
76	}
77
78	yearset = 0;
79	switch (strlen(arg)) {
80	case 12:			/* CCYYMMDDhhmm */
81		t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE;
82		yearset = 1;
83		/* FALLTHROUGH */
84	case 10:			/* YYMMDDhhmm */
85		if (yearset) {
86			t->tm_year += ATOI2(arg);
87		} else {
88			yearset = ATOI2(arg);
89			if (yearset < 69)
90				t->tm_year = yearset + 2000 - TM_YEAR_BASE;
91			else
92				t->tm_year = yearset + 1900 - TM_YEAR_BASE;
93		}
94		/* FALLTHROUGH */
95	case 8:				/* MMDDhhmm */
96		t->tm_mon = ATOI2(arg);
97		--t->tm_mon;		/* Convert from 01-12 to 00-11 */
98		/* FALLTHROUGH */
99	case 6:
100		t->tm_mday = ATOI2(arg);
101		/* FALLTHROUGH */
102	case 4:
103		t->tm_hour = ATOI2(arg);
104		/* FALLTHROUGH */
105	case 2:
106		t->tm_min = ATOI2(arg);
107		break;
108	default:
109		goto terr;
110	}
111
112	t->tm_isdst = -1;		/* Figure out DST. */
113	tmptime = mktime(t);
114	if (tmptime == (time_t)-1)
115terr:		errx(1,
116	"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
117
118	return (tmptime);
119}
120