344 lines
7.7 KiB
C
344 lines
7.7 KiB
C
/* $NetBSD: date.c,v 1.60 2011/08/27 12:55:09 joerg Exp $ */
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/*
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* Copyright (c) 1985, 1987, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT(
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"@(#) Copyright (c) 1985, 1987, 1988, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95";
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#else
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__RCSID("$NetBSD: date.c,v 1.60 2011/08/27 12:55:09 joerg Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <err.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <tzfile.h>
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#include <unistd.h>
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#include <util.h>
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#include "extern.h"
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static time_t tval;
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static int aflag, jflag, rflag, nflag;
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__dead static void badformat(void);
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__dead static void badtime(void);
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__dead static void badvalue(const char *);
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static void setthetime(const char *);
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__dead static void usage(void);
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int
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main(int argc, char *argv[])
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{
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char *buf;
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size_t bufsiz;
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const char *format;
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int ch;
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long long val;
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struct tm *tm;
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setprogname(argv[0]);
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(void)setlocale(LC_ALL, "");
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while ((ch = getopt(argc, argv, "ad:jnr:u")) != -1) {
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switch (ch) {
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case 'a': /* adjust time slowly */
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aflag = 1;
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nflag = 1;
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break;
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case 'd':
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#if !defined(__minix)
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rflag = 1;
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tval = parsedate(optarg, NULL, NULL);
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if (tval == -1)
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#endif /* !defined(__minix) */
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badarg: errx(EXIT_FAILURE,
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"Cannot parse `%s'", optarg);
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break;
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case 'j': /* don't set time */
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jflag = 1;
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break;
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case 'n': /* don't set network */
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nflag = 1;
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break;
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case 'r': /* user specified seconds */
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errno = 0;
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val = strtoll(optarg, &buf, 0);
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if (optarg[0] == '\0' || *buf != '\0')
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goto badarg;
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if (errno == ERANGE && (val == LLONG_MAX ||
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val == LLONG_MIN))
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err(EXIT_FAILURE, "Bad number `%s'", optarg);
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rflag = 1;
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tval = (time_t)val;
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break;
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case 'u': /* do everything in UTC */
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(void)setenv("TZ", "UTC0", 1);
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (!rflag && time(&tval) == -1)
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err(EXIT_FAILURE, "time");
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/* allow the operands in any order */
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if (*argv && **argv == '+') {
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format = *argv;
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++argv;
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} else
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format = "+%a %b %e %H:%M:%S %Z %Y";
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if (*argv) {
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setthetime(*argv);
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++argv;
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}
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if (*argv && **argv == '+')
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format = *argv;
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if ((buf = malloc(bufsiz = 1024)) == NULL)
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goto bad;
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if ((tm = localtime(&tval)) == NULL)
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err(EXIT_FAILURE, "localtime %lld failed", (long long)tval);
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while (strftime(buf, bufsiz, format, tm) == 0)
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if ((buf = realloc(buf, bufsiz <<= 1)) == NULL)
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goto bad;
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(void)printf("%s\n", buf + 1);
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free(buf);
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return 0;
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bad:
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err(EXIT_FAILURE, "Cannot allocate format buffer");
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}
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static void
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badformat(void)
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{
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warnx("illegal time format");
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usage();
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}
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static void
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badtime(void)
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{
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errx(EXIT_FAILURE, "illegal time");
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/* NOTREACHED */
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}
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static void
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badvalue(const char *param)
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{
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warnx("invalid %s supplied", param);
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usage();
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}
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#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
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static void
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setthetime(const char *p)
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{
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struct timeval tv;
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time_t new_time;
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struct tm *lt;
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const char *dot, *t;
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size_t len;
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int yearset;
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for (t = p, dot = NULL; *t; ++t) {
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if (isdigit((unsigned char)*t))
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continue;
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if (*t == '.' && dot == NULL) {
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dot = t;
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continue;
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}
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badformat();
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}
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if ((lt = localtime(&tval)) == NULL)
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err(EXIT_FAILURE, "localtime %lld failed", (long long)tval);
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lt->tm_isdst = -1; /* Divine correct DST */
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if (dot != NULL) { /* .ss */
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len = strlen(dot);
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if (len != 3)
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badformat();
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++dot;
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lt->tm_sec = ATOI2(dot);
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if (lt->tm_sec > 61)
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badvalue("seconds");
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} else {
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len = 0;
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lt->tm_sec = 0;
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}
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yearset = 0;
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switch (strlen(p) - len) {
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case 12: /* cc */
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lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
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if (lt->tm_year < 0)
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badtime();
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yearset = 1;
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/* FALLTHROUGH */
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case 10: /* yy */
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if (yearset) {
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lt->tm_year += ATOI2(p);
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} else {
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yearset = ATOI2(p);
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if (yearset < 69)
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lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
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else
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lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
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}
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/* FALLTHROUGH */
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case 8: /* mm */
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lt->tm_mon = ATOI2(p);
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if (lt->tm_mon > 12 || lt->tm_mon == 0)
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badvalue("month");
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--lt->tm_mon; /* time struct is 0 - 11 */
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/* FALLTHROUGH */
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case 6: /* dd */
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lt->tm_mday = ATOI2(p);
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switch (lt->tm_mon) {
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case 0:
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case 2:
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case 4:
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case 6:
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case 7:
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case 9:
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case 11:
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if (lt->tm_mday > 31 || lt->tm_mday == 0)
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badvalue("day of month");
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break;
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case 3:
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case 5:
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case 8:
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case 10:
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if (lt->tm_mday > 30 || lt->tm_mday == 0)
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badvalue("day of month");
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break;
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case 1:
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if (lt->tm_mday > 29 || lt->tm_mday == 0 ||
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(lt->tm_mday == 29 &&
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!isleap(lt->tm_year + TM_YEAR_BASE)))
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badvalue("day of month");
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break;
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default:
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badvalue("month");
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break;
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}
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/* FALLTHROUGH */
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case 4: /* hh */
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lt->tm_hour = ATOI2(p);
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if (lt->tm_hour > 23)
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badvalue("hour");
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/* FALLTHROUGH */
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case 2: /* mm */
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lt->tm_min = ATOI2(p);
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if (lt->tm_min > 59)
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badvalue("minute");
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break;
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case 0: /* was just .sss */
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if (len != 0)
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break;
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/* FALLTHROUGH */
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default:
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badformat();
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}
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/* convert broken-down time to UTC clock time */
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if ((new_time = mktime(lt)) == -1)
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badtime();
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/* if jflag is set, don't actually change the time, just return */
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if (jflag) {
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tval = new_time;
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return;
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}
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/* set the time */
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if (nflag || netsettime(new_time)) {
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logwtmp("|", "date", "");
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if (aflag) {
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tv.tv_sec = new_time - tval;
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tv.tv_usec = 0;
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if (adjtime(&tv, NULL))
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err(EXIT_FAILURE, "adjtime");
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} else {
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tval = new_time;
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tv.tv_sec = tval;
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tv.tv_usec = 0;
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if (settimeofday(&tv, NULL))
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err(EXIT_FAILURE, "settimeofday");
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}
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logwtmp("{", "date", "");
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}
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if ((p = getlogin()) == NULL)
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p = "???";
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syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"Usage: %s [-ajnu] [-d date] [-r seconds] [+format]",
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getprogname());
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(void)fprintf(stderr, " [[[[[[CC]yy]mm]dd]HH]MM[.SS]]\n");
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exit(EXIT_FAILURE);
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/* NOTREACHED */
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}
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