stime.c revision 1.3 
1/*	$NetBSD: stime.c,v 1.3 2003/08/07 11:13:08 agc 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 1.3 2003/08/07 11:13:08 agc 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(arg)
57	char *arg;
58{
59	struct tm *t;
60	time_t tmptime;
61	int yearset;
62	char *p;
63					/* Start with the current time. */
64	if (time(&tmptime) == (time_t)-1)
65		err(1, "time");
66
67	if ((t = localtime(&tmptime)) == NULL)
68		err(1, "localtime");
69					/* [[CC]YY]MMDDhhmm[.SS] */
70	if ((p = strchr(arg, '.')) == NULL)
71		t->tm_sec = 0;		/* Seconds defaults to 0. */
72	else {
73		if (strlen(p + 1) != 2)
74			goto terr;
75		*p++ = '\0';
76		t->tm_sec = ATOI2(p);
77	}
78
79	yearset = 0;
80	switch (strlen(arg)) {
81	case 12:			/* CCYYMMDDhhmm */
82		t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE;
83		yearset = 1;
84		/* FALLTHOUGH */
85	case 10:			/* YYMMDDhhmm */
86		if (yearset) {
87			t->tm_year += ATOI2(arg);
88		} else {
89			yearset = ATOI2(arg);
90			if (yearset < 69)
91				t->tm_year = yearset + 2000 - TM_YEAR_BASE;
92			else
93				t->tm_year = yearset + 1900 - TM_YEAR_BASE;
94		}
95		/* FALLTHROUGH */
96	case 8:				/* MMDDhhmm */
97		t->tm_mon = ATOI2(arg);
98		--t->tm_mon;		/* Convert from 01-12 to 00-11 */
99		/* FALLTHROUGH */
100	case 6:
101		t->tm_mday = ATOI2(arg);
102		/* FALLTHROUGH */
103	case 4:
104		t->tm_hour = ATOI2(arg);
105		/* FALLTHROUGH */
106	case 2:
107		t->tm_min = ATOI2(arg);
108		break;
109	default:
110		goto terr;
111	}
112
113	t->tm_isdst = -1;		/* Figure out DST. */
114	tmptime = mktime(t);
115	if (tmptime == (time_t)-1)
116terr:		errx(1,
117	"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
118
119	return (tmptime);
120}
121