/* $NetBSD: date.c,v 1.61 2014/09/01 21:42:21 dholland Exp $ */
/*
* Copyright (c) 1985, 1987, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/time.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <bsd/stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <utmpx.h>
#include <stdbool.h>
#include "extern.h"
#define TM_YEAR_BASE 1900
static time_t tval;
static int aflag, jflag, rflag, nflag;
static void badcanotime(const char *, const char *, size_t);
static void setthetime(const char *);
static void usage(void);
int
main(int argc, char *argv[])
{
char *buf;
size_t bufsiz;
const char *format;
int ch;
long long val;
struct tm *tm;
setprogname(argv[0]);
(void)setlocale(LC_ALL, "");
while ((ch = getopt(argc, argv, "a:jnr:u")) != -1) {
switch (ch) {
case 'a': /* adjust time slowly */
aflag = 1;
nflag = 1;
break;
case 'j': /* don't set time */
jflag = 1;
break;
case 'r': /* user specified seconds */
if (optarg[0] == '\0') {
errx(EXIT_FAILURE, "<empty>: Invalid number");
}
errno = 0;
val = strtoll(optarg, &buf, 0);
if (errno) {
err(EXIT_FAILURE, "%s", optarg);
}
if (optarg[0] == '\0' || *buf != '\0') {
errx(EXIT_FAILURE,
"%s: Invalid number", optarg);
}
rflag = 1;
tval = (time_t)val;
break;
case 'u': /* do everything in UTC */
(void)setenv("TZ", "UTC0", 1);
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (!rflag && time(&tval) == -1)
err(EXIT_FAILURE, "time");
/* allow the operands in any order */
if (*argv && **argv == '+') {
format = *argv;
++argv;
} else
format = "+%a %b %e %H:%M:%S %Z %Y";
if (*argv) {
setthetime(*argv);
++argv;
}
if (*argv && **argv == '+')
format = *argv;
if ((buf = malloc(bufsiz = 1024)) == NULL)
goto bad;
if ((tm = localtime(&tval)) == NULL)
err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
while (strftime(buf, bufsiz, format, tm) == 0)
if ((buf = realloc(buf, bufsiz <<= 1)) == NULL)
goto bad;
(void)printf("%s\n", buf + 1);
free(buf);
return 0;
bad:
err(EXIT_FAILURE, "Cannot allocate format buffer");
}
static inline bool
isleap(int year) {
if ((year % 100) == 0) {
if ((year % 400) != 0) {
return false;
}
} else if (year % 4) {
return false;
}
return true;
}
static void
badcanotime(const char *msg, const char *val, size_t where)
{
warnx("%s in canonical time", msg);
warnx("%s", val);
warnx("%*s", (int)where + 1, "^");
usage();
}
#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
static void
setthetime(const char *p)
{
struct timeval tv;
time_t new_time;
struct tm *lt;
const char *dot, *t, *op;
size_t len;
int yearset;
for (t = p, dot = NULL; *t; ++t) {
if (*t == '.') {
if (dot == NULL) {
dot = t;
} else {
badcanotime("Unexpected dot", p, t - p);
}
} else if (!isdigit((unsigned char)*t)) {
badcanotime("Expected digit", p, t - p);
}
}
if ((lt = localtime(&tval)) == NULL)
err(EXIT_FAILURE, "%lld: localtime", (long long)tval);
lt->tm_isdst = -1; /* Divine correct DST */
if (dot != NULL) { /* .ss */
len = strlen(dot);
if (len > 3) {
badcanotime("Unexpected digit after seconds field",
p, strlen(p) - 1);
} else if (len < 3) {
badcanotime("Expected digit in seconds field",
p, strlen(p));
}
++dot;
lt->tm_sec = ATOI2(dot);
if (lt->tm_sec > 61)
badcanotime("Seconds out of range", p, strlen(p) - 1);
} else {
len = 0;
lt->tm_sec = 0;
}
op = p;
yearset = 0;
switch (strlen(p) - len) {
case 12: /* cc */
lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
if (lt->tm_year < 0)
badcanotime("Year before 1900", op, p - op + 1);
yearset = 1;
/* FALLTHROUGH */
case 10: /* yy */
if (yearset) {
lt->tm_year += ATOI2(p);
} else {
yearset = ATOI2(p);
if (yearset < 69)
lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
else
lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
}
/* FALLTHROUGH */
case 8: /* mm */
lt->tm_mon = ATOI2(p);
if (lt->tm_mon > 12 || lt->tm_mon == 0)
badcanotime("Month out of range", op, p - op - 1);
--lt->tm_mon; /* time struct is 0 - 11 */
/* FALLTHROUGH */
case 6: /* dd */
lt->tm_mday = ATOI2(p);
switch (lt->tm_mon) {
case 0:
case 2:
case 4:
case 6:
case 7:
case 9:
case 11:
if (lt->tm_mday > 31 || lt->tm_mday == 0)
badcanotime("Day out of range (max 31)",
op, p - op - 1);
break;
case 3:
case 5:
case 8:
case 10:
if (lt->tm_mday > 30 || lt->tm_mday == 0)
badcanotime("Day out of range (max 30)",
op, p - op - 1);
break;
case 1:
if (isleap(lt->tm_year + TM_YEAR_BASE)) {
if (lt->tm_mday > 29 || lt->tm_mday == 0) {
badcanotime("Day out of range "
"(max 29)",
op, p - op - 1);
}
} else {
if (lt->tm_mday > 28 || lt->tm_mday == 0) {
badcanotime("Day out of range "
"(max 28)",
op, p - op - 1);
}
}
break;
default:
/*
* If the month was given, it's already been
* checked. If a bad value came back from
* localtime, something's badly broken.
* (make this an assertion?)
*/
errx(EXIT_FAILURE, "localtime gave invalid month %d",
lt->tm_mon);
}
/* FALLTHROUGH */
case 4: /* hh */
lt->tm_hour = ATOI2(p);
if (lt->tm_hour > 23)
badcanotime("Hour out of range", op, p - op - 1);
/* FALLTHROUGH */
case 2: /* mm */
lt->tm_min = ATOI2(p);
if (lt->tm_min > 59)
badcanotime("Minute out of range", op, p - op - 1);
break;
case 0: /* was just .sss */
if (len != 0)
break;
/* FALLTHROUGH */
default:
if (strlen(p) - len > 12) {
badcanotime("Too many digits", p, 12);
} else {
badcanotime("Not enough digits", p, strlen(p) - len);
}
}
/* convert broken-down time to UTC clock time */
if ((new_time = mktime(lt)) == -1) {
/* Can this actually happen? */
err(EXIT_FAILURE, "%s: mktime", op);
}
/* if jflag is set, don't actually change the time, just return */
if (jflag) {
tval = new_time;
return;
}
/* set the time */
logwtmp("|", "date", "");
if (aflag) {
tv.tv_sec = new_time - tval;
tv.tv_usec = 0;
if (adjtime(&tv, NULL))
err(EXIT_FAILURE, "adjtime");
} else {
tval = new_time;
tv.tv_sec = tval;
tv.tv_usec = 0;
if (settimeofday(&tv, NULL))
err(EXIT_FAILURE, "settimeofday");
}
logwtmp("{", "date", "");
if ((p = getlogin()) == NULL)
p = "???";
syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
}
static void
usage(void)
{
(void)fprintf(stderr,
"Usage: %s [-aju] [-r seconds] [+format]",
getprogname());
(void)fprintf(stderr, " [[[[[[CC]yy]mm]dd]HH]MM[.SS]]\n");
exit(EXIT_FAILURE);
/* NOTREACHED */
}
