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 source tree.
12 /* This 'date' command supports only 2 time setting formats,
13 all the GNU strftime stuff (its in libc, lets use it),
14 setting time using UTC and displaying it, as well as
15 an RFC 2822 compliant date output for shell scripting
18 /* Input parsing code is always bulky - used heavy duty libc stuff as
19 much as possible, missed out a lot of bounds checking */
25 //config: date is used to set the system date or display the
26 //config: current time in the given format.
28 //config:config FEATURE_DATE_ISOFMT
29 //config: bool "Enable ISO date format output (-I)"
31 //config: depends on DATE
33 //config: Enable option (-I) to output an ISO-8601 compliant
34 //config: date/time string.
36 //config:# defaults to "no": stat's nanosecond field is a bit non-portable
37 //config:config FEATURE_DATE_NANO
38 //config: bool "Support %[num]N nanosecond format specifier"
40 //config: depends on DATE # syscall(__NR_clock_gettime)
41 //config: select PLATFORM_LINUX
43 //config: Support %[num]N format specifier. Adds ~250 bytes of code.
45 //config:config FEATURE_DATE_COMPAT
46 //config: bool "Support weird 'date MMDDhhmm[[YY]YY][.ss]' format"
48 //config: depends on DATE
50 //config: System time can be set by 'date -s DATE' and simply 'date DATE',
51 //config: but formats of DATE string are different. 'date DATE' accepts
52 //config: a rather weird MMDDhhmm[[YY]YY][.ss] format with completely
53 //config: unnatural placement of year between minutes and seconds.
54 //config: date -s (and other commands like touch -d) use more sensible
55 //config: formats (for one, ISO format YYYY-MM-DD hh:mm:ss.ssssss).
57 //config: With this option off, 'date DATE' is 'date -s DATE' support
58 //config: the same format. With it on, 'date DATE' additionally supports
59 //config: MMDDhhmm[[YY]YY][.ss] format.
61 //applet:IF_DATE(APPLET(date, BB_DIR_BIN, BB_SUID_DROP))
63 //kbuild:lib-$(CONFIG_DATE) += date.o
65 /* GNU coreutils 6.9 man page:
66 * date [OPTION]... [+FORMAT]
67 * date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
69 * display time described by STRING, not `now'
71 * like --date once for each line of DATEFILE
72 * -r, --reference=FILE
73 * display the last modification time of FILE
75 * output date and time in RFC 2822 format.
76 * Example: Mon, 07 Aug 2006 12:34:56 -0600
78 * output date and time in RFC 3339 format.
79 * TIMESPEC='date', 'seconds', or 'ns'
80 * Date and time components are separated by a single space:
81 * 2006-08-07 12:34:56-06:00
83 * set time described by STRING
84 * -u, --utc, --universal
85 * print or set Coordinated Universal Time
88 * long options are not supported
90 * -I seems to roughly match --rfc-3339, but -I has _optional_ param
91 * (thus "-I seconds" doesn't work, only "-Iseconds"),
92 * and does not support -Ins
93 * -D FMT is a bbox extension for _input_ conversion of -d DATE
96 //usage:#define date_trivial_usage
97 //usage: "[OPTIONS] [+FMT] [TIME]"
98 //usage:#define date_full_usage "\n\n"
99 //usage: "Display time (using +FMT), or set time\n"
100 //usage: IF_NOT_LONG_OPTS(
101 //usage: "\n [-s] TIME Set time to TIME"
102 //usage: "\n -u Work in UTC (don't convert to local time)"
103 //usage: "\n -R Output RFC-2822 compliant date string"
104 //usage: ) IF_LONG_OPTS(
105 //usage: "\n [-s,--set] TIME Set time to TIME"
106 //usage: "\n -u,--utc Work in UTC (don't convert to local time)"
107 //usage: "\n -R,--rfc-2822 Output RFC-2822 compliant date string"
109 //usage: IF_FEATURE_DATE_ISOFMT(
110 //usage: "\n -I[SPEC] Output ISO-8601 compliant date string"
111 //usage: "\n SPEC='date' (default) for date only,"
112 //usage: "\n 'hours', 'minutes', or 'seconds' for date and"
113 //usage: "\n time to the indicated precision"
115 //usage: IF_NOT_LONG_OPTS(
116 //usage: "\n -r FILE Display last modification time of FILE"
117 //usage: "\n -d TIME Display TIME, not 'now'"
118 //usage: ) IF_LONG_OPTS(
119 //usage: "\n -r,--reference FILE Display last modification time of FILE"
120 //usage: "\n -d,--date TIME Display TIME, not 'now'"
122 //usage: IF_FEATURE_DATE_ISOFMT(
123 //usage: "\n -D FMT Use FMT for -d TIME conversion"
126 //usage: "\nRecognized TIME formats:"
127 //usage: "\n hh:mm[:ss]"
128 //usage: "\n [YYYY.]MM.DD-hh:mm[:ss]"
129 //usage: "\n YYYY-MM-DD hh:mm[:ss]"
130 //usage: "\n [[[[[YY]YY]MM]DD]hh]mm[.ss]"
131 //usage: IF_FEATURE_DATE_COMPAT(
132 //usage: "\n 'date TIME' form accepts MMDDhhmm[[YY]YY][.ss] instead"
135 //usage:#define date_example_usage
137 //usage: "Wed Apr 12 18:52:41 MDT 2000\n"
140 #include "common_bufsiz.h"
141 #if ENABLE_FEATURE_DATE_NANO
142 # include <sys/syscall.h>
146 OPT_RFC2822 = (1 << 0), /* R */
147 OPT_SET = (1 << 1), /* s */
148 OPT_UTC = (1 << 2), /* u */
149 OPT_DATE = (1 << 3), /* d */
150 OPT_REFERENCE = (1 << 4), /* r */
151 OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */
152 OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */
155 static void maybe_set_utc(int opt)
158 putenv((char*)"TZ=UTC0");
162 static const char date_longopts[] ALIGN1 =
163 "rfc-822\0" No_argument "R"
164 "rfc-2822\0" No_argument "R"
165 "set\0" Required_argument "s"
166 "utc\0" No_argument "u"
167 /* "universal\0" No_argument "u" */
168 "date\0" Required_argument "d"
169 "reference\0" Required_argument "r"
173 int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
174 int date_main(int argc UNUSED_PARAM, char **argv)
178 char buf_fmt_dt2str[64];
185 char *isofmt_arg = NULL;
187 opt_complementary = "d--s:s--d"
188 IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
189 IF_LONG_OPTS(applet_long_options = date_longopts;)
190 opt = getopt32(argv, "Rs:ud:r:"
191 IF_FEATURE_DATE_ISOFMT("I::D:"),
192 &date_str, &date_str, &filename
193 IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
197 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) {
198 ifmt = 0; /* default is date */
200 static const char isoformats[] ALIGN1 =
201 "date\0""hours\0""minutes\0""seconds\0"; /* ns? */
202 ifmt = index_in_substrings(isoformats, isofmt_arg);
209 if (argv[0] && argv[0][0] == '+') {
210 fmt_dt2str = &argv[0][1]; /* skip over the '+' */
213 if (!(opt & (OPT_SET | OPT_DATE))) {
215 date_str = argv[0]; /* can be NULL */
217 #if ENABLE_FEATURE_DATE_COMPAT
218 int len = strspn(date_str, "0123456789");
219 if (date_str[len] == '\0'
220 || (date_str[len] == '.'
221 && isdigit(date_str[len+1])
222 && isdigit(date_str[len+2])
223 && date_str[len+3] == '\0'
226 /* Dreaded MMDDhhmm[[CC]YY][.ss] format!
227 * It does not match -d or -s format.
228 * Some users actually do use it.
231 if (len < 0 || len > 4 || (len & 1))
232 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
233 if (len != 0) { /* move YY or CCYY to front */
235 memcpy(buf, date_str + 8, len);
236 memmove(date_str + len, date_str, 8);
237 memcpy(date_str, buf, len);
247 /* Now we have parsed all the information except the date format
248 * which depends on whether the clock is being set or read */
250 if (opt & OPT_REFERENCE) {
252 xstat(filename, &statbuf);
253 ts.tv_sec = statbuf.st_mtime;
254 #if ENABLE_FEATURE_DATE_NANO
255 ts.tv_nsec = statbuf.st_mtim.tv_nsec;
256 /* Some toolchains use .st_mtimensec instead of st_mtim.tv_nsec.
257 * If you need #define _SVID_SOURCE 1 to enable st_mtim.tv_nsec,
258 * drop a mail to project mailing list please
262 #if ENABLE_FEATURE_DATE_NANO
263 /* libc has incredibly messy way of doing this,
264 * typically requiring -lrt. We just skip all this mess */
265 syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts);
270 localtime_r(&ts.tv_sec, &tm_time);
272 /* If date string is given, update tm_time, and maybe set date */
273 if (date_str != NULL) {
274 /* Zero out fields - take her back to midnight! */
279 /* Process any date input to UNIX time since 1 Jan 1970 */
280 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) {
281 if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
282 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
284 parse_datestr(date_str, &tm_time);
287 /* Correct any day of week and day of year etc. fields */
288 /* Be sure to recheck dst (but not if date is time_t format) */
289 if (date_str[0] != '@')
290 tm_time.tm_isdst = -1;
291 ts.tv_sec = validate_tm_time(date_str, &tm_time);
295 /* if setting time, set it */
296 if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
297 bb_perror_msg("can't set date");
303 /* Deal with format string */
304 if (fmt_dt2str == NULL) {
306 fmt_dt2str = buf_fmt_dt2str;
307 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
308 /* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */
309 strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S");
312 /* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */
314 fmt_dt2str[i++] = '%';
315 fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z';
317 fmt_dt2str[i] = '\0';
318 } else if (opt & OPT_RFC2822) {
319 /* -R. undo busybox.c setlocale */
320 if (ENABLE_LOCALE_SUPPORT)
321 setlocale(LC_TIME, "C");
322 strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
323 i = sizeof("%a, %d %b %Y %H:%M:%S ")-1;
325 } else { /* default case */
326 fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
329 #if ENABLE_FEATURE_DATE_NANO
331 /* User-specified fmt_dt2str */
332 /* Search for and process "%N" */
333 char *p = fmt_dt2str;
334 while ((p = strchr(p, '%')) != NULL) {
336 unsigned pres, scale;
343 n = strspn(p, "0123456789");
348 /* We have "%[nnn]N" */
354 pres = xatoi_positive(p);
364 fmt_dt2str = xasprintf("%s%0*u%s", fmt_dt2str, pres, (unsigned)ts.tv_nsec / scale, p);
370 #define date_buf bb_common_bufsiz1
371 setup_common_bufsiz();
372 if (*fmt_dt2str == '\0') {
373 /* With no format string, just print a blank line */
376 /* Handle special conversions */
377 if (is_prefixed_with(fmt_dt2str, "%f")) {
378 fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
380 /* Generate output string */
381 strftime(date_buf, COMMON_BUFSIZE, fmt_dt2str, &tm_time);