1 /* vi: set sw=4 ts=4: */
3 * Mini date implementation for busybox
5 * by Matthew Grant <grantma@anathoth.gen.nz>
7 * iso-format handling added by Robert Griebl <griebl@gmx.de>
8 * bugfixes and cleanup by Bernhard Reutner-Fischer
10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
13 /* This 'date' command supports only 2 time setting formats,
14 all the GNU strftime stuff (its in libc, lets use it),
15 setting time using UTC and displaying it, as well as
16 an RFC 2822 compliant date output for shell scripting
19 /* Input parsing code is always bulky - used heavy duty libc stuff as
20 much as possible, missed out a lot of bounds checking */
22 /* Default input handling to save surprising some people */
24 /* GNU coreutils 6.9 man page:
25 * date [OPTION]... [+FORMAT]
26 * date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
28 * display time described by STRING, not `now'
30 * like --date once for each line of DATEFILE
31 * -r, --reference=FILE
32 * display the last modification time of FILE
34 * output date and time in RFC 2822 format.
35 * Example: Mon, 07 Aug 2006 12:34:56 -0600
37 * output date and time in RFC 3339 format.
38 * TIMESPEC='date', 'seconds', or 'ns'
39 * Date and time components are separated by a single space:
40 * 2006-08-07 12:34:56-06:00
42 * set time described by STRING
43 * -u, --utc, --universal
44 * print or set Coordinated Universal Time
47 * long options are not supported
49 * -I seems to roughly match --rfc-3339, but -I has _optional_ param
50 * (thus "-I seconds" doesn't work, only "-Iseconds"),
51 * and does not support -Ins
52 * -D FMT is a bbox extension for _input_ conversion of -d DATE
55 //kbuild:lib-$(CONFIG_DATE) += date.o
61 //config: date is used to set the system date or display the
62 //config: current time in the given format.
64 //config:config FEATURE_DATE_ISOFMT
65 //config: bool "Enable ISO date format output (-I)"
67 //config: depends on DATE
69 //config: Enable option (-I) to output an ISO-8601 compliant
70 //config: date/time string.
72 //config:config FEATURE_DATE_NANO
73 //config: bool "Support %[num]N nanosecond format specifier"
75 //config: depends on DATE && PLATFORM_LINUX # syscall(__NR_clock_gettime)
77 //config: Support %[num]N format specifier. Adds ~250 bytes of code.
79 //config:config FEATURE_DATE_COMPAT
80 //config: bool "Support weird 'date MMDDhhmm[[YY]YY][.ss]' format"
82 //config: depends on DATE
84 //config: System time can be set by 'date -s DATE' and simply 'date DATE',
85 //config: but formats of DATE string are different. 'date DATE' accepts
86 //config: a rather weird MMDDhhmm[[YY]YY][.ss] format with completely
87 //config: unnatural placement of year between minutes and seconds.
88 //config: date -s (and other commands like touch -d) use more sensible
89 //config: formats (for one, ISO format YYYY-MM-DD hh:mm:ss.ssssss).
91 //config: With this option off, 'date DATE' is 'date -s DATE' support
92 //config: the same format. With it on, 'date DATE' additionally supports
93 //config: MMDDhhmm[[YY]YY][.ss] format.
96 #if ENABLE_FEATURE_DATE_NANO
97 # include <sys/syscall.h>
101 OPT_RFC2822 = (1 << 0), /* R */
102 OPT_SET = (1 << 1), /* s */
103 OPT_UTC = (1 << 2), /* u */
104 OPT_DATE = (1 << 3), /* d */
105 OPT_REFERENCE = (1 << 4), /* r */
106 OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */
107 OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */
110 static void maybe_set_utc(int opt)
113 putenv((char*)"TZ=UTC0");
117 static const char date_longopts[] ALIGN1 =
118 "rfc-822\0" No_argument "R"
119 "rfc-2822\0" No_argument "R"
120 "set\0" Required_argument "s"
121 "utc\0" No_argument "u"
122 /* "universal\0" No_argument "u" */
123 "date\0" Required_argument "d"
124 "reference\0" Required_argument "r"
128 int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
129 int date_main(int argc UNUSED_PARAM, char **argv)
133 char buf_fmt_dt2str[64];
140 char *isofmt_arg = NULL;
142 opt_complementary = "d--s:s--d"
143 IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
144 IF_LONG_OPTS(applet_long_options = date_longopts;)
145 opt = getopt32(argv, "Rs:ud:r:"
146 IF_FEATURE_DATE_ISOFMT("I::D:"),
147 &date_str, &date_str, &filename
148 IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
152 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) {
153 ifmt = 0; /* default is date */
155 static const char isoformats[] ALIGN1 =
156 "date\0""hours\0""minutes\0""seconds\0"; /* ns? */
157 ifmt = index_in_substrings(isoformats, isofmt_arg);
164 if (argv[0] && argv[0][0] == '+') {
165 fmt_dt2str = &argv[0][1]; /* skip over the '+' */
168 if (!(opt & (OPT_SET | OPT_DATE))) {
170 date_str = argv[0]; /* can be NULL */
172 #if ENABLE_FEATURE_DATE_COMPAT
173 int len = strspn(date_str, "0123456789");
174 if (date_str[len] == '\0'
175 || (date_str[len] == '.'
176 && isdigit(date_str[len+1])
177 && isdigit(date_str[len+2])
178 && date_str[len+3] == '\0'
181 /* Dreaded MMDDhhmm[[CC]YY][.ss] format!
182 * It does not match -d or -s format.
183 * Some users actually do use it.
186 if (len < 0 || len > 4 || (len & 1))
187 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
188 if (len != 0) { /* move YY or CCYY to front */
190 memcpy(buf, date_str + 8, len);
191 memmove(date_str + len, date_str, 8);
192 memcpy(date_str, buf, len);
202 /* Now we have parsed all the information except the date format
203 * which depends on whether the clock is being set or read */
205 if (opt & OPT_REFERENCE) {
207 xstat(filename, &statbuf);
208 ts.tv_sec = statbuf.st_mtime;
209 #if ENABLE_FEATURE_DATE_NANO
210 ts.tv_nsec = statbuf.st_mtim.tv_nsec;
213 #if ENABLE_FEATURE_DATE_NANO
214 /* libc has incredibly messy way of doing this,
215 * typically requiring -lrt. We just skip all this mess */
216 syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts);
221 localtime_r(&ts.tv_sec, &tm_time);
223 /* If date string is given, update tm_time, and maybe set date */
224 if (date_str != NULL) {
225 /* Zero out fields - take her back to midnight! */
230 /* Process any date input to UNIX time since 1 Jan 1970 */
231 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) {
232 if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
233 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
235 parse_datestr(date_str, &tm_time);
238 /* Correct any day of week and day of year etc. fields */
239 tm_time.tm_isdst = -1; /* Be sure to recheck dst */
240 ts.tv_sec = validate_tm_time(date_str, &tm_time);
244 /* if setting time, set it */
245 if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
246 bb_perror_msg("can't set date");
252 /* Deal with format string */
253 if (fmt_dt2str == NULL) {
255 fmt_dt2str = buf_fmt_dt2str;
256 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
257 /* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */
258 strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S");
261 /* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */
263 fmt_dt2str[i++] = '%';
264 fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z';
266 fmt_dt2str[i] = '\0';
267 } else if (opt & OPT_RFC2822) {
268 /* -R. undo busybox.c setlocale */
269 if (ENABLE_LOCALE_SUPPORT)
270 setlocale(LC_TIME, "C");
271 strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
272 i = sizeof("%a, %d %b %Y %H:%M:%S ")-1;
274 } else { /* default case */
275 fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
278 #if ENABLE_FEATURE_DATE_NANO
280 /* User-specified fmt_dt2str */
281 /* Search for and process "%N" */
282 char *p = fmt_dt2str;
283 while ((p = strchr(p, '%')) != NULL) {
285 unsigned pres, scale;
292 n = strspn(p, "0123456789");
297 /* We have "%[nnn]N" */
303 pres = xatoi_positive(p);
313 fmt_dt2str = xasprintf("%s%0*u%s", fmt_dt2str, pres, (unsigned)ts.tv_nsec / scale, p);
319 #define date_buf bb_common_bufsiz1
320 if (*fmt_dt2str == '\0') {
321 /* With no format string, just print a blank line */
324 /* Handle special conversions */
325 if (strncmp(fmt_dt2str, "%f", 2) == 0) {
326 fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
328 /* Generate output string */
329 strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);