stime.c revision 1.2 
1/*	$NetBSD: stime.c,v 1.2 2000/10/15 15:33:46 bjh21 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT("@(#) Copyright (c) 1993\n\
39	The Regents of the University of California.  All rights reserved.\n");
40#endif /* not lint */
41
42#ifndef lint
43#if 0
44static char sccsid[] = "from: @(#)touch.c	8.2 (Berkeley) 4/28/95";
45#endif
46__RCSID("$NetBSD: stime.c,v 1.2 2000/10/15 15:33:46 bjh21 Exp $");
47#endif /* not lint */
48
49
50#include <err.h>
51#include <string.h>
52#include <time.h>
53#include <tzfile.h>
54
55#include "stime.h"
56
57#define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
58
59time_t
60stime(arg)
61	char *arg;
62{
63	struct tm *t;
64	time_t tmptime;
65	int yearset;
66	char *p;
67					/* Start with the current time. */
68	if (time(&tmptime) == (time_t)-1)
69		err(1, "time");
70
71	if ((t = localtime(&tmptime)) == NULL)
72		err(1, "localtime");
73					/* [[CC]YY]MMDDhhmm[.SS] */
74	if ((p = strchr(arg, '.')) == NULL)
75		t->tm_sec = 0;		/* Seconds defaults to 0. */
76	else {
77		if (strlen(p + 1) != 2)
78			goto terr;
79		*p++ = '\0';
80		t->tm_sec = ATOI2(p);
81	}
82
83	yearset = 0;
84	switch (strlen(arg)) {
85	case 12:			/* CCYYMMDDhhmm */
86		t->tm_year = ATOI2(arg) * 100 - TM_YEAR_BASE;
87		yearset = 1;
88		/* FALLTHOUGH */
89	case 10:			/* YYMMDDhhmm */
90		if (yearset) {
91			t->tm_year += ATOI2(arg);
92		} else {
93			yearset = ATOI2(arg);
94			if (yearset < 69)
95				t->tm_year = yearset + 2000 - TM_YEAR_BASE;
96			else
97				t->tm_year = yearset + 1900 - TM_YEAR_BASE;
98		}
99		/* FALLTHROUGH */
100	case 8:				/* MMDDhhmm */
101		t->tm_mon = ATOI2(arg);
102		--t->tm_mon;		/* Convert from 01-12 to 00-11 */
103		/* FALLTHROUGH */
104	case 6:
105		t->tm_mday = ATOI2(arg);
106		/* FALLTHROUGH */
107	case 4:
108		t->tm_hour = ATOI2(arg);
109		/* FALLTHROUGH */
110	case 2:
111		t->tm_min = ATOI2(arg);
112		break;
113	default:
114		goto terr;
115	}
116
117	t->tm_isdst = -1;		/* Figure out DST. */
118	tmptime = mktime(t);
119	if (tmptime == (time_t)-1)
120terr:		errx(1,
121	"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
122
123	return (tmptime);
124}
125