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-rw-r--r--bin/date/date.c466
1 files changed, 466 insertions, 0 deletions
diff --git a/bin/date/date.c b/bin/date/date.c
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index 000000000000..01797084c0d6
--- /dev/null
+++ b/bin/date/date.c
@@ -0,0 +1,466 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * 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 <sys/stat.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <errno.h>
+#include <locale.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <utmpx.h>
+
+#include "vary.h"
+
+#ifndef TM_YEAR_BASE
+#define TM_YEAR_BASE 1900
+#endif
+
+static void badformat(void);
+static void iso8601_usage(const char *) __dead2;
+static void multipleformats(void);
+static void printdate(const char *);
+static void printisodate(struct tm *, long);
+static void setthetime(const char *, const char *, int, struct timespec *);
+static size_t strftime_ns(char * __restrict, size_t, const char * __restrict,
+ const struct tm * __restrict, long);
+static void usage(void) __dead2;
+
+static const struct iso8601_fmt {
+ const char *refname;
+ const char *format_string;
+} iso8601_fmts[] = {
+ { "date", "%Y-%m-%d" },
+ { "hours", "T%H" },
+ { "minutes", ":%M" },
+ { "seconds", ":%S" },
+ { "ns", ",%N" },
+};
+static const struct iso8601_fmt *iso8601_selected;
+
+static const char *rfc2822_format = "%a, %d %b %Y %T %z";
+
+int
+main(int argc, char *argv[])
+{
+ struct timespec ts;
+ int ch, rflag;
+ bool Iflag, jflag, Rflag;
+ const char *format;
+ char buf[1024];
+ char *fmt, *outzone = NULL;
+ char *tmp;
+ struct vary *v;
+ const struct vary *badv;
+ struct tm *lt;
+ struct stat sb;
+ size_t i;
+
+ v = NULL;
+ fmt = NULL;
+ (void) setlocale(LC_TIME, "");
+ rflag = 0;
+ Iflag = jflag = Rflag = 0;
+ ts.tv_sec = 0;
+ ts.tv_nsec = 0;
+ while ((ch = getopt(argc, argv, "f:I::jnRr:uv:z:")) != -1)
+ switch((char)ch) {
+ case 'f':
+ fmt = optarg;
+ break;
+ case 'I':
+ if (Rflag)
+ multipleformats();
+ Iflag = 1;
+ if (optarg == NULL) {
+ iso8601_selected = iso8601_fmts;
+ break;
+ }
+ for (i = 0; i < nitems(iso8601_fmts); i++)
+ if (strcmp(optarg, iso8601_fmts[i].refname) == 0)
+ break;
+ if (i == nitems(iso8601_fmts))
+ iso8601_usage(optarg);
+
+ iso8601_selected = &iso8601_fmts[i];
+ break;
+ case 'j':
+ jflag = 1; /* don't set time */
+ break;
+ case 'n':
+ break;
+ case 'R': /* RFC 2822 datetime format */
+ if (Iflag)
+ multipleformats();
+ Rflag = 1;
+ break;
+ case 'r': /* user specified seconds */
+ rflag = 1;
+ ts.tv_sec = strtoq(optarg, &tmp, 0);
+ if (*tmp != 0) {
+ if (stat(optarg, &sb) == 0) {
+ ts.tv_sec = sb.st_mtim.tv_sec;
+ ts.tv_nsec = sb.st_mtim.tv_nsec;
+ } else
+ usage();
+ }
+ break;
+ case 'u': /* do everything in UTC */
+ (void)setenv("TZ", "UTC0", 1);
+ break;
+ case 'z':
+ outzone = optarg;
+ break;
+ case 'v':
+ v = vary_append(v, optarg);
+ break;
+ default:
+ usage();
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (!rflag && clock_gettime(CLOCK_REALTIME, &ts) == -1)
+ err(1, "clock_gettime");
+
+ format = "%+";
+
+ if (Rflag)
+ format = rfc2822_format;
+
+ /* allow the operands in any order */
+ if (*argv && **argv == '+') {
+ if (Iflag)
+ multipleformats();
+ format = *argv + 1;
+ ++argv;
+ }
+
+ if (*argv) {
+ setthetime(fmt, *argv, jflag, &ts);
+ ++argv;
+ } else if (fmt != NULL)
+ usage();
+
+ if (*argv && **argv == '+') {
+ if (Iflag)
+ multipleformats();
+ format = *argv + 1;
+ }
+
+ if (outzone != NULL && setenv("TZ", outzone, 1) != 0)
+ err(1, "setenv(TZ)");
+ lt = localtime(&ts.tv_sec);
+ if (lt == NULL)
+ errx(1, "invalid time");
+ badv = vary_apply(v, lt);
+ if (badv) {
+ fprintf(stderr, "%s: Cannot apply date adjustment\n",
+ badv->arg);
+ vary_destroy(v);
+ usage();
+ }
+ vary_destroy(v);
+
+ if (Iflag)
+ printisodate(lt, ts.tv_nsec);
+
+ if (format == rfc2822_format)
+ /*
+ * When using RFC 2822 datetime format, don't honor the
+ * locale.
+ */
+ setlocale(LC_TIME, "C");
+
+
+ (void)strftime_ns(buf, sizeof(buf), format, lt, ts.tv_nsec);
+ printdate(buf);
+}
+
+static void
+printdate(const char *buf)
+{
+ (void)printf("%s\n", buf);
+ if (fflush(stdout))
+ err(1, "stdout");
+ exit(EXIT_SUCCESS);
+}
+
+static void
+printisodate(struct tm *lt, long nsec)
+{
+ const struct iso8601_fmt *it;
+ char fmtbuf[64], buf[64], tzbuf[8];
+
+ fmtbuf[0] = 0;
+ for (it = iso8601_fmts; it <= iso8601_selected; it++)
+ strlcat(fmtbuf, it->format_string, sizeof(fmtbuf));
+
+ (void)strftime_ns(buf, sizeof(buf), fmtbuf, lt, nsec);
+
+ if (iso8601_selected > iso8601_fmts) {
+ (void)strftime_ns(tzbuf, sizeof(tzbuf), "%z", lt, nsec);
+ memmove(&tzbuf[4], &tzbuf[3], 3);
+ tzbuf[3] = ':';
+ strlcat(buf, tzbuf, sizeof(buf));
+ }
+
+ printdate(buf);
+}
+
+#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
+
+static void
+setthetime(const char *fmt, const char *p, int jflag, struct timespec *ts)
+{
+ struct utmpx utx;
+ struct tm *lt;
+ const char *dot, *t;
+ int century;
+
+ lt = localtime(&ts->tv_sec);
+ if (lt == NULL)
+ errx(1, "invalid time");
+ lt->tm_isdst = -1; /* divine correct DST */
+
+ if (fmt != NULL) {
+ t = strptime(p, fmt, lt);
+ if (t == NULL) {
+ fprintf(stderr, "Failed conversion of ``%s''"
+ " using format ``%s''\n", p, fmt);
+ badformat();
+ } else if (*t != '\0')
+ fprintf(stderr, "Warning: Ignoring %ld extraneous"
+ " characters in date string (%s)\n",
+ (long) strlen(t), t);
+ } else {
+ for (t = p, dot = NULL; *t; ++t) {
+ if (isdigit(*t))
+ continue;
+ if (*t == '.' && dot == NULL) {
+ dot = t;
+ continue;
+ }
+ badformat();
+ }
+
+ if (dot != NULL) { /* .ss */
+ dot++; /* *dot++ = '\0'; */
+ if (strlen(dot) != 2)
+ badformat();
+ lt->tm_sec = ATOI2(dot);
+ if (lt->tm_sec > 61)
+ badformat();
+ } else
+ lt->tm_sec = 0;
+
+ century = 0;
+ /* if p has a ".ss" field then let's pretend it's not there */
+ switch (strlen(p) - ((dot != NULL) ? 3 : 0)) {
+ case 12: /* cc */
+ lt->tm_year = ATOI2(p) * 100 - TM_YEAR_BASE;
+ century = 1;
+ /* FALLTHROUGH */
+ case 10: /* yy */
+ if (century)
+ lt->tm_year += ATOI2(p);
+ else {
+ lt->tm_year = ATOI2(p);
+ if (lt->tm_year < 69) /* hack for 2000 ;-} */
+ lt->tm_year += 2000 - TM_YEAR_BASE;
+ else
+ lt->tm_year += 1900 - TM_YEAR_BASE;
+ }
+ /* FALLTHROUGH */
+ case 8: /* mm */
+ lt->tm_mon = ATOI2(p);
+ if (lt->tm_mon > 12)
+ badformat();
+ --lt->tm_mon; /* time struct is 0 - 11 */
+ /* FALLTHROUGH */
+ case 6: /* dd */
+ lt->tm_mday = ATOI2(p);
+ if (lt->tm_mday > 31)
+ badformat();
+ /* FALLTHROUGH */
+ case 4: /* HH */
+ lt->tm_hour = ATOI2(p);
+ if (lt->tm_hour > 23)
+ badformat();
+ /* FALLTHROUGH */
+ case 2: /* MM */
+ lt->tm_min = ATOI2(p);
+ if (lt->tm_min > 59)
+ badformat();
+ break;
+ default:
+ badformat();
+ }
+ }
+
+ /* convert broken-down time to GMT clock time */
+ lt->tm_yday = -1;
+ ts->tv_sec = mktime(lt);
+ if (lt->tm_yday == -1)
+ errx(1, "nonexistent time");
+ ts->tv_nsec = 0;
+
+ if (!jflag) {
+ utx.ut_type = OLD_TIME;
+ memset(utx.ut_id, 0, sizeof(utx.ut_id));
+ (void)gettimeofday(&utx.ut_tv, NULL);
+ pututxline(&utx);
+ if (clock_settime(CLOCK_REALTIME, ts) != 0)
+ err(1, "clock_settime");
+ utx.ut_type = NEW_TIME;
+ (void)gettimeofday(&utx.ut_tv, NULL);
+ pututxline(&utx);
+
+ if ((p = getlogin()) == NULL)
+ p = "???";
+ syslog(LOG_AUTH | LOG_NOTICE, "date set by %s", p);
+ }
+}
+
+/*
+ * The strftime_ns function is a wrapper around strftime(3), which adds support
+ * for features absent from strftime(3). Currently, the only extra feature is
+ * support for %N, the nanosecond conversion specification.
+ *
+ * The functions scans the format string for the non-standard conversion
+ * specifications and replaces them with the date and time values before
+ * passing the format string to strftime(3). The handling of the non-standard
+ * conversion specifications happens before the call to strftime(3) to handle
+ * cases like "%%N" correctly ("%%N" should yield "%N" instead of nanoseconds).
+ */
+static size_t
+strftime_ns(char * __restrict s, size_t maxsize, const char * __restrict format,
+ const struct tm * __restrict t, long nsec)
+{
+ size_t prefixlen;
+ size_t ret;
+ char *newformat;
+ char *oldformat;
+ const char *prefix;
+ const char *suffix;
+ const char *tok;
+ bool seen_percent;
+
+ seen_percent = false;
+ if ((newformat = strdup(format)) == NULL)
+ err(1, "strdup");
+ tok = newformat;
+ for (tok = newformat; *tok != '\0'; tok++) {
+ switch (*tok) {
+ case '%':
+ /*
+ * If the previous token was a percent sign,
+ * then there are two percent tokens in a row.
+ */
+ if (seen_percent)
+ seen_percent = false;
+ else
+ seen_percent = true;
+ break;
+ case 'N':
+ if (seen_percent) {
+ oldformat = newformat;
+ prefix = oldformat;
+ prefixlen = tok - oldformat - 1;
+ suffix = tok + 1;
+ /*
+ * Construct a new format string from the
+ * prefix (i.e., the part of the old format
+ * from its beginning to the currently handled
+ * "%N" conversion specification), the
+ * nanoseconds, and the suffix (i.e., the part
+ * of the old format from the next token to the
+ * end).
+ */
+ if (asprintf(&newformat, "%.*s%.9ld%s",
+ (int)prefixlen, prefix, nsec,
+ suffix) < 0) {
+ err(1, "asprintf");
+ }
+ free(oldformat);
+ tok = newformat + prefixlen + 9;
+ }
+ seen_percent = false;
+ break;
+ default:
+ seen_percent = false;
+ break;
+ }
+ }
+
+ ret = strftime(s, maxsize, newformat, t);
+ free(newformat);
+ return (ret);
+}
+
+static void
+badformat(void)
+{
+ warnx("illegal time format");
+ usage();
+}
+
+static void
+iso8601_usage(const char *badarg)
+{
+ errx(1, "invalid argument '%s' for -I", badarg);
+}
+
+static void
+multipleformats(void)
+{
+ errx(1, "multiple output formats specified");
+}
+
+static void
+usage(void)
+{
+ (void)fprintf(stderr, "%s\n%s\n%s\n",
+ "usage: date [-jnRu] [-I[date|hours|minutes|seconds|ns]] [-f input_fmt]",
+ " "
+ "[ -z output_zone ] [-r filename|seconds] [-v[+|-]val[y|m|w|d|H|M|S]]",
+ " "
+ "[[[[[[cc]yy]mm]dd]HH]MM[.SS] | new_date] [+output_fmt]"
+ );
+ exit(1);
+}
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