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.
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 //applet:IF_DATE(APPLET(date, BB_DIR_BIN, BB_SUID_DROP))
24 //kbuild:lib-$(CONFIG_DATE) += date.o
30 //config: date is used to set the system date or display the
31 //config: current time in the given format.
33 //config:config FEATURE_DATE_ISOFMT
34 //config: bool "Enable ISO date format output (-I)"
36 //config: depends on DATE
38 //config: Enable option (-I) to output an ISO-8601 compliant
39 //config: date/time string.
41 //config:# defaults to "no": stat's nanosecond field is a bit non-portable
42 //config:config FEATURE_DATE_NANO
43 //config: bool "Support %[num]N nanosecond format specifier"
45 //config: depends on DATE # syscall(__NR_clock_gettime)
46 //config: select PLATFORM_LINUX
48 //config: Support %[num]N format specifier. Adds ~250 bytes of code.
50 //config:config FEATURE_DATE_COMPAT
51 //config: bool "Support weird 'date MMDDhhmm[[YY]YY][.ss]' format"
53 //config: depends on DATE
55 //config: System time can be set by 'date -s DATE' and simply 'date DATE',
56 //config: but formats of DATE string are different. 'date DATE' accepts
57 //config: a rather weird MMDDhhmm[[YY]YY][.ss] format with completely
58 //config: unnatural placement of year between minutes and seconds.
59 //config: date -s (and other commands like touch -d) use more sensible
60 //config: formats (for one, ISO format YYYY-MM-DD hh:mm:ss.ssssss).
62 //config: With this option off, 'date DATE' is 'date -s DATE' support
63 //config: the same format. With it on, 'date DATE' additionally supports
64 //config: MMDDhhmm[[YY]YY][.ss] format.
66 /* GNU coreutils 6.9 man page:
67 * date [OPTION]... [+FORMAT]
68 * date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
70 * display time described by STRING, not `now'
72 * like --date once for each line of DATEFILE
73 * -r, --reference=FILE
74 * display the last modification time of FILE
76 * output date and time in RFC 2822 format.
77 * Example: Mon, 07 Aug 2006 12:34:56 -0600
79 * output date and time in RFC 3339 format.
80 * TIMESPEC='date', 'seconds', or 'ns'
81 * Date and time components are separated by a single space:
82 * 2006-08-07 12:34:56-06:00
84 * set time described by STRING
85 * -u, --utc, --universal
86 * print or set Coordinated Universal Time
89 * long options are not supported
91 * -I seems to roughly match --rfc-3339, but -I has _optional_ param
92 * (thus "-I seconds" doesn't work, only "-Iseconds"),
93 * and does not support -Ins
94 * -D FMT is a bbox extension for _input_ conversion of -d DATE
97 //usage:#define date_trivial_usage
98 //usage: "[OPTIONS] [+FMT] [TIME]"
99 //usage:#define date_full_usage "\n\n"
100 //usage: "Display time (using +FMT), or set time\n"
101 //usage: IF_NOT_LONG_OPTS(
102 //usage: "\n [-s] TIME Set time to TIME"
103 //usage: "\n -u Work in UTC (don't convert to local time)"
104 //usage: "\n -R Output RFC-2822 compliant date string"
105 //usage: ) IF_LONG_OPTS(
106 //usage: "\n [-s,--set] TIME Set time to TIME"
107 //usage: "\n -u,--utc Work in UTC (don't convert to local time)"
108 //usage: "\n -R,--rfc-2822 Output RFC-2822 compliant date string"
110 //usage: IF_FEATURE_DATE_ISOFMT(
111 //usage: "\n -I[SPEC] Output ISO-8601 compliant date string"
112 //usage: "\n SPEC='date' (default) for date only,"
113 //usage: "\n 'hours', 'minutes', or 'seconds' for date and"
114 //usage: "\n time to the indicated precision"
116 //usage: IF_NOT_LONG_OPTS(
117 //usage: "\n -r FILE Display last modification time of FILE"
118 //usage: "\n -d TIME Display TIME, not 'now'"
119 //usage: ) IF_LONG_OPTS(
120 //usage: "\n -r,--reference FILE Display last modification time of FILE"
121 //usage: "\n -d,--date TIME Display TIME, not 'now'"
123 //usage: IF_FEATURE_DATE_ISOFMT(
124 //usage: "\n -D FMT Use FMT for -d TIME conversion"
127 //usage: "\nRecognized TIME formats:"
128 //usage: "\n hh:mm[:ss]"
129 //usage: "\n [YYYY.]MM.DD-hh:mm[:ss]"
130 //usage: "\n YYYY-MM-DD hh:mm[:ss]"
131 //usage: "\n [[[[[YY]YY]MM]DD]hh]mm[.ss]"
133 //usage:#define date_example_usage
135 //usage: "Wed Apr 12 18:52:41 MDT 2000\n"
138 #if ENABLE_FEATURE_DATE_NANO
139 # include <sys/syscall.h>
143 OPT_RFC2822 = (1 << 0), /* R */
144 OPT_SET = (1 << 1), /* s */
145 OPT_UTC = (1 << 2), /* u */
146 OPT_DATE = (1 << 3), /* d */
147 OPT_REFERENCE = (1 << 4), /* r */
148 OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */
149 OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */
152 static void maybe_set_utc(int opt)
155 putenv((char*)"TZ=UTC0");
159 static const char date_longopts[] ALIGN1 =
160 "rfc-822\0" No_argument "R"
161 "rfc-2822\0" No_argument "R"
162 "set\0" Required_argument "s"
163 "utc\0" No_argument "u"
164 /* "universal\0" No_argument "u" */
165 "date\0" Required_argument "d"
166 "reference\0" Required_argument "r"
170 int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
171 int date_main(int argc UNUSED_PARAM, char **argv)
175 char buf_fmt_dt2str[64];
182 char *isofmt_arg = NULL;
184 opt_complementary = "d--s:s--d"
185 IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
186 IF_LONG_OPTS(applet_long_options = date_longopts;)
187 opt = getopt32(argv, "Rs:ud:r:"
188 IF_FEATURE_DATE_ISOFMT("I::D:"),
189 &date_str, &date_str, &filename
190 IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
194 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) {
195 ifmt = 0; /* default is date */
197 static const char isoformats[] ALIGN1 =
198 "date\0""hours\0""minutes\0""seconds\0"; /* ns? */
199 ifmt = index_in_substrings(isoformats, isofmt_arg);
206 if (argv[0] && argv[0][0] == '+') {
207 fmt_dt2str = &argv[0][1]; /* skip over the '+' */
210 if (!(opt & (OPT_SET | OPT_DATE))) {
212 date_str = argv[0]; /* can be NULL */
214 #if ENABLE_FEATURE_DATE_COMPAT
215 int len = strspn(date_str, "0123456789");
216 if (date_str[len] == '\0'
217 || (date_str[len] == '.'
218 && isdigit(date_str[len+1])
219 && isdigit(date_str[len+2])
220 && date_str[len+3] == '\0'
223 /* Dreaded MMDDhhmm[[CC]YY][.ss] format!
224 * It does not match -d or -s format.
225 * Some users actually do use it.
228 if (len < 0 || len > 4 || (len & 1))
229 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
230 if (len != 0) { /* move YY or CCYY to front */
232 memcpy(buf, date_str + 8, len);
233 memmove(date_str + len, date_str, 8);
234 memcpy(date_str, buf, len);
244 /* Now we have parsed all the information except the date format
245 * which depends on whether the clock is being set or read */
247 if (opt & OPT_REFERENCE) {
249 xstat(filename, &statbuf);
250 ts.tv_sec = statbuf.st_mtime;
251 #if ENABLE_FEATURE_DATE_NANO
252 ts.tv_nsec = statbuf.st_mtim.tv_nsec;
253 /* Some toolchains use .st_mtimensec instead of st_mtim.tv_nsec.
254 * If you need #define _SVID_SOURCE 1 to enable st_mtim.tv_nsec,
255 * drop a mail to project mailing list please
259 #if ENABLE_FEATURE_DATE_NANO
260 /* libc has incredibly messy way of doing this,
261 * typically requiring -lrt. We just skip all this mess */
262 syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts);
267 localtime_r(&ts.tv_sec, &tm_time);
269 /* If date string is given, update tm_time, and maybe set date */
270 if (date_str != NULL) {
271 /* Zero out fields - take her back to midnight! */
276 /* Process any date input to UNIX time since 1 Jan 1970 */
277 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) {
278 if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
279 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
281 parse_datestr(date_str, &tm_time);
284 /* Correct any day of week and day of year etc. fields */
285 /* Be sure to recheck dst (but not if date is time_t format) */
286 if (date_str[0] != '@')
287 tm_time.tm_isdst = -1;
288 ts.tv_sec = validate_tm_time(date_str, &tm_time);
292 /* if setting time, set it */
293 if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
294 bb_perror_msg("can't set date");
300 /* Deal with format string */
301 if (fmt_dt2str == NULL) {
303 fmt_dt2str = buf_fmt_dt2str;
304 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
305 /* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */
306 strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S");
309 /* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */
311 fmt_dt2str[i++] = '%';
312 fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z';
314 fmt_dt2str[i] = '\0';
315 } else if (opt & OPT_RFC2822) {
316 /* -R. undo busybox.c setlocale */
317 if (ENABLE_LOCALE_SUPPORT)
318 setlocale(LC_TIME, "C");
319 strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
320 i = sizeof("%a, %d %b %Y %H:%M:%S ")-1;
322 } else { /* default case */
323 fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
326 #if ENABLE_FEATURE_DATE_NANO
328 /* User-specified fmt_dt2str */
329 /* Search for and process "%N" */
330 char *p = fmt_dt2str;
331 while ((p = strchr(p, '%')) != NULL) {
333 unsigned pres, scale;
340 n = strspn(p, "0123456789");
345 /* We have "%[nnn]N" */
351 pres = xatoi_positive(p);
361 fmt_dt2str = xasprintf("%s%0*u%s", fmt_dt2str, pres, (unsigned)ts.tv_nsec / scale, p);
367 #define date_buf bb_common_bufsiz1
368 if (*fmt_dt2str == '\0') {
369 /* With no format string, just print a blank line */
372 /* Handle special conversions */
373 if (strncmp(fmt_dt2str, "%f", 2) == 0) {
374 fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
376 /* Generate output string */
377 strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);