278 lines
6.4 KiB
C
278 lines
6.4 KiB
C
/* $OpenBSD: date.c,v 1.60 2024/04/28 16:43:15 florian Exp $ */
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/* $NetBSD: date.c,v 1.11 1995/09/07 06:21:05 jtc 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/types.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 <limits.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 <unistd.h>
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#include <util.h>
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extern char *__progname;
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time_t tval;
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int jflag;
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int slidetime;
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static void setthetime(char *, const char *);
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static void badformat(void);
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static void __dead usage(void);
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int
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main(int argc, char *argv[])
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{
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const char *errstr;
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struct tm *tp;
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int ch, rflag;
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char *format, buf[1024], *outzone = NULL;
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const char *pformat = NULL;
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rflag = 0;
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while ((ch = getopt(argc, argv, "af:jr:uz:")) != -1)
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switch(ch) {
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case 'a':
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slidetime = 1;
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break;
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case 'f': /* parse with strptime */
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pformat = optarg;
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break;
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case 'j': /* don't set */
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jflag = 1;
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break;
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case 'r': /* user specified seconds */
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rflag = 1;
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tval = strtonum(optarg, LLONG_MIN, LLONG_MAX, &errstr);
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if (errstr)
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errx(1, "seconds is %s: %s", errstr, optarg);
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break;
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case 'u': /* do everything in UTC */
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if (setenv("TZ", "UTC", 1) == -1)
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err(1, "cannot unsetenv TZ");
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break;
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case 'z':
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outzone = optarg;
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break;
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default:
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usage();
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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(1, "time");
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format = "%a %b %e %H:%M:%S %Z %Y";
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/* allow the operands in any order */
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if (*argv && **argv == '+') {
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format = *argv + 1;
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argv++;
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argc--;
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}
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if (*argv) {
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setthetime(*argv, pformat);
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argv++;
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argc--;
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}
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if (pledge("stdio", NULL) == -1)
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err(1, "pledge");
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if (*argv && **argv == '+') {
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format = *argv + 1;
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argc--;
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}
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if (argc > 0)
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errx(1, "too many arguments");
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if (outzone)
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setenv("TZ", outzone, 1);
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tp = localtime(&tval);
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if (tp == NULL)
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errx(1, "conversion error");
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(void)strftime(buf, sizeof(buf), format, tp);
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(void)printf("%s\n", buf);
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return 0;
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}
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#define ATOI2(ar) ((ar) += 2, ((ar)[-2] - '0') * 10 + ((ar)[-1] - '0'))
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void
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setthetime(char *p, const char *pformat)
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{
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struct tm *lt, tm;
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struct timeval tv;
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char *dot, *t;
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time_t now;
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int yearset = 0;
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/* Let us set the time even if logwtmp would fail. */
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unveil("/var/log/wtmp", "w");
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if (pledge("stdio settime wpath", NULL) == -1)
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err(1, "pledge");
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lt = localtime(&tval);
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if (lt == NULL)
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errx(1, "conversion error");
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lt->tm_isdst = -1; /* correct for DST */
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if (pformat) {
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tm = *lt;
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if (strptime(p, pformat, &tm) == NULL) {
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fprintf(stderr, "trouble %s %s\n", p, pformat);
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badformat();
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}
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lt = &tm;
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} else {
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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 (dot != NULL) { /* .SS */
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*dot++ = '\0';
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if (strlen(dot) != 2)
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badformat();
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lt->tm_sec = ATOI2(dot);
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if (lt->tm_sec > 61)
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badformat();
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} else
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lt->tm_sec = 0;
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switch (strlen(p)) {
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case 12: /* cc */
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lt->tm_year = (ATOI2(p) * 100) - 1900;
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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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/* mask out current year, leaving only century */
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lt->tm_year = ((lt->tm_year / 100) * 100);
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}
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lt->tm_year += ATOI2(p);
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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)
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badformat();
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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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if ((lt->tm_mday > 31) || !lt->tm_mday)
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badformat();
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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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badformat();
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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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badformat();
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break;
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default:
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badformat();
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}
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}
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/* convert broken-down time to UTC clock time */
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if (pformat != NULL && strstr(pformat, "%s") != NULL)
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tval = timegm(lt);
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else
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tval = mktime(lt);
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if (tval == -1)
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errx(1, "specified date is outside allowed range");
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if (jflag)
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return;
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/* set the time */
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if (slidetime) {
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if ((now = time(NULL)) == -1)
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err(1, "time");
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tv.tv_sec = tval - now;
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tv.tv_usec = 0;
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if (adjtime(&tv, NULL) == -1)
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err(1, "adjtime");
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} else {
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#ifndef SMALL
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logwtmp("|", "date", "");
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#endif
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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(1, "settimeofday");
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#ifndef SMALL
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logwtmp("{", "date", "");
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#endif
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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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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 __dead
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usage(void)
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{
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fprintf(stderr,
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"usage: %s [-aju] [-f pformat] [-r seconds]\n"
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"\t[-z output_zone] [+format] [[[[[[cc]yy]mm]dd]HH]MM[.SS]]\n",
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__progname);
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exit(1);
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}
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