8b82def341
Since D19668 was done, new users of the -n flag have surfaced. Parse and ignore it on the command line until they can be updated. Suggested by: rgrimes (in D19668).
394 lines
8.8 KiB
C
394 lines
8.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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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#ifndef lint
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static char const copyright[] =
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"@(#) Copyright (c) 1985, 1987, 1988, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)date.c 8.2 (Berkeley) 4/28/95";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <ctype.h>
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#include <err.h>
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#include <locale.h>
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#include <stdbool.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 <unistd.h>
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#include <utmpx.h>
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#include "vary.h"
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#ifndef TM_YEAR_BASE
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#define TM_YEAR_BASE 1900
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#endif
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static time_t tval;
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static void badformat(void);
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static void iso8601_usage(const char *);
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static void multipleformats(void);
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static void printdate(const char *);
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static void printisodate(struct tm *);
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static void setthetime(const char *, const char *, int);
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static void usage(void);
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static const struct iso8601_fmt {
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const char *refname;
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const char *format_string;
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} iso8601_fmts[] = {
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{ "date", "%Y-%m-%d" },
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{ "hours", "T%H" },
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{ "minutes", ":%M" },
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{ "seconds", ":%S" },
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};
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static const struct iso8601_fmt *iso8601_selected;
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static const char *rfc2822_format = "%a, %d %b %Y %T %z";
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int
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main(int argc, char *argv[])
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{
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int ch, rflag;
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bool Iflag, jflag, Rflag;
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const char *format;
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char buf[1024];
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char *fmt;
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char *tmp;
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struct vary *v;
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const struct vary *badv;
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struct tm *lt;
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struct stat sb;
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size_t i;
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v = NULL;
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fmt = NULL;
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(void) setlocale(LC_TIME, "");
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rflag = 0;
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Iflag = jflag = Rflag = 0;
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while ((ch = getopt(argc, argv, "f:I::jnRr:uv:")) != -1)
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switch((char)ch) {
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case 'f':
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fmt = optarg;
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break;
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case 'I':
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if (Rflag)
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multipleformats();
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Iflag = 1;
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if (optarg == NULL) {
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iso8601_selected = iso8601_fmts;
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break;
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}
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for (i = 0; i < nitems(iso8601_fmts); i++)
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if (strcmp(optarg, iso8601_fmts[i].refname) == 0)
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break;
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if (i == nitems(iso8601_fmts))
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iso8601_usage(optarg);
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iso8601_selected = &iso8601_fmts[i];
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break;
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case 'j':
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jflag = 1; /* don't set time */
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break;
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case 'n':
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break;
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case 'R': /* RFC 2822 datetime format */
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if (Iflag)
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multipleformats();
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Rflag = 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 = strtoq(optarg, &tmp, 0);
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if (*tmp != 0) {
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if (stat(optarg, &sb) == 0)
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tval = sb.st_mtim.tv_sec;
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else
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usage();
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}
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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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case 'v':
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v = vary_append(v, 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 = "%+";
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if (Rflag)
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format = rfc2822_format;
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/* allow the operands in any order */
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if (*argv && **argv == '+') {
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if (Iflag)
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multipleformats();
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format = *argv + 1;
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++argv;
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}
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if (*argv) {
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setthetime(fmt, *argv, jflag);
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++argv;
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} else if (fmt != NULL)
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usage();
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if (*argv && **argv == '+') {
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if (Iflag)
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multipleformats();
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format = *argv + 1;
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}
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lt = localtime(&tval);
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if (lt == NULL)
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errx(1, "invalid time");
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badv = vary_apply(v, lt);
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if (badv) {
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fprintf(stderr, "%s: Cannot apply date adjustment\n",
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badv->arg);
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vary_destroy(v);
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usage();
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}
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vary_destroy(v);
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if (Iflag)
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printisodate(lt);
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if (format == rfc2822_format)
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/*
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* When using RFC 2822 datetime format, don't honor the
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* locale.
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*/
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setlocale(LC_TIME, "C");
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(void)strftime(buf, sizeof(buf), format, lt);
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printdate(buf);
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}
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static void
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printdate(const char *buf)
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{
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(void)printf("%s\n", buf);
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if (fflush(stdout))
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err(1, "stdout");
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exit(EXIT_SUCCESS);
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}
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static void
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printisodate(struct tm *lt)
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{
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const struct iso8601_fmt *it;
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char fmtbuf[32], buf[32], tzbuf[8];
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fmtbuf[0] = 0;
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for (it = iso8601_fmts; it <= iso8601_selected; it++)
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strlcat(fmtbuf, it->format_string, sizeof(fmtbuf));
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(void)strftime(buf, sizeof(buf), fmtbuf, lt);
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if (iso8601_selected > iso8601_fmts) {
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(void)strftime(tzbuf, sizeof(tzbuf), "%z", lt);
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memmove(&tzbuf[4], &tzbuf[3], 3);
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tzbuf[3] = ':';
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strlcat(buf, tzbuf, sizeof(buf));
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}
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printdate(buf);
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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 *fmt, const char *p, int jflag)
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{
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struct utmpx utx;
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struct tm *lt;
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struct timeval tv;
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const char *dot, *t;
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int century;
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lt = localtime(&tval);
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if (lt == NULL)
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errx(1, "invalid time");
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lt->tm_isdst = -1; /* divine correct DST */
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if (fmt != NULL) {
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t = strptime(p, fmt, lt);
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if (t == NULL) {
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fprintf(stderr, "Failed conversion of ``%s''"
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" using format ``%s''\n", p, fmt);
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badformat();
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} else if (*t != '\0')
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fprintf(stderr, "Warning: Ignoring %ld extraneous"
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" characters in date string (%s)\n",
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(long) strlen(t), t);
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} else {
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for (t = p, dot = NULL; *t; ++t) {
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if (isdigit(*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++; /* *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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century = 0;
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/* if p has a ".ss" field then let's pretend it's not there */
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switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
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case 12: /* cc */
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lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
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century = 1;
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/* FALLTHROUGH */
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case 10: /* yy */
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if (century)
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lt->tm_year += ATOI2(p);
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else {
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lt->tm_year = ATOI2(p);
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if (lt->tm_year < 69) /* hack for 2000 ;-} */
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lt->tm_year += 2000 - TM_YEAR_BASE;
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else
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lt->tm_year += 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)
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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)
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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 GMT clock time */
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if ((tval = mktime(lt)) == -1)
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errx(1, "nonexistent time");
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if (!jflag) {
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utx.ut_type = OLD_TIME;
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memset(utx.ut_id, 0, sizeof(utx.ut_id));
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(void)gettimeofday(&utx.ut_tv, NULL);
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pututxline(&utx);
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tv.tv_sec = tval;
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tv.tv_usec = 0;
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if (settimeofday(&tv, NULL) != 0)
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err(1, "settimeofday (timeval)");
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utx.ut_type = NEW_TIME;
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(void)gettimeofday(&utx.ut_tv, NULL);
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pututxline(&utx);
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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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}
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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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iso8601_usage(const char *badarg)
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{
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errx(1, "invalid argument '%s' for -I", badarg);
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}
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static void
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multipleformats(void)
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{
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errx(1, "multiple output formats specified");
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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, "%s\n%s\n%s\n",
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"usage: date [-jnRu] [-r seconds|file] [-v[+|-]val[ymwdHMS]]",
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" "
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"[-I[date | hours | minutes | seconds]]",
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" "
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"[-f fmt date | [[[[[cc]yy]mm]dd]HH]MM[.ss]] [+format]"
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);
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exit(1);
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}
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