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 */
22 //config: bool "date (7.1 kb)"
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"
39 //config: default n # syscall(__NR_clock_gettime)
40 //config: depends on DATE
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_NOEXEC(date, date, BB_DIR_BIN, BB_SUID_DROP, date))
62 /* bb_common_bufsiz1 usage here is safe wrt NOEXEC: not expecting it to be zeroed. */
64 //kbuild:lib-$(CONFIG_DATE) += date.o
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]"
132 //usage: IF_FEATURE_DATE_COMPAT(
133 //usage: "\n 'date TIME' form accepts MMDDhhmm[[YY]YY][.ss] instead"
136 //usage:#define date_example_usage
138 //usage: "Wed Apr 12 18:52:41 MDT 2000\n"
141 #include "common_bufsiz.h"
142 #if ENABLE_FEATURE_DATE_NANO
143 # include <sys/syscall.h>
147 OPT_RFC2822 = (1 << 0), /* R */
148 OPT_SET = (1 << 1), /* s */
149 OPT_UTC = (1 << 2), /* u */
150 OPT_DATE = (1 << 3), /* d */
151 OPT_REFERENCE = (1 << 4), /* r */
152 OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */
153 OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */
157 static const char date_longopts[] ALIGN1 =
158 "rfc-822\0" No_argument "R"
159 "rfc-2822\0" No_argument "R"
160 "set\0" Required_argument "s"
161 "utc\0" No_argument "u"
162 /* "universal\0" No_argument "u" */
163 "date\0" Required_argument "d"
164 "reference\0" Required_argument "r"
168 /* We are a NOEXEC applet.
169 * Obstacles to NOFORK:
171 * - xasprintf result not freed
172 * - after xasprintf we use other xfuncs
175 static void maybe_set_utc(int opt)
178 putenv((char*)"TZ=UTC0");
181 int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
182 int date_main(int argc UNUSED_PARAM, char **argv)
186 char buf_fmt_dt2str[64];
193 char *isofmt_arg = NULL;
195 opt = getopt32long(argv, "^"
197 IF_FEATURE_DATE_ISOFMT("I::D:")
200 IF_FEATURE_DATE_ISOFMT(":R--I:I--R"),
202 &date_str, &date_str, &filename
203 IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt)
209 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) {
210 ifmt = 0; /* default is date */
212 static const char isoformats[] ALIGN1 =
213 "date\0""hours\0""minutes\0""seconds\0"; /* ns? */
214 ifmt = index_in_substrings(isoformats, isofmt_arg);
221 if (argv[0] && argv[0][0] == '+') {
222 fmt_dt2str = &argv[0][1]; /* skip over the '+' */
225 if (!(opt & (OPT_SET | OPT_DATE))) {
227 date_str = argv[0]; /* can be NULL */
229 #if ENABLE_FEATURE_DATE_COMPAT
230 int len = strspn(date_str, "0123456789");
231 if (date_str[len] == '\0'
232 || (date_str[len] == '.'
233 && isdigit(date_str[len+1])
234 && isdigit(date_str[len+2])
235 && date_str[len+3] == '\0'
238 /* Dreaded MMDDhhmm[[CC]YY][.ss] format!
239 * It does not match -d or -s format.
240 * Some users actually do use it.
243 if (len < 0 || len > 4 || (len & 1))
244 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
245 if (len != 0) { /* move YY or CCYY to front */
247 memcpy(buf, date_str + 8, len);
248 memmove(date_str + len, date_str, 8);
249 memcpy(date_str, buf, len);
259 /* Now we have parsed all the information except the date format
260 * which depends on whether the clock is being set or read */
262 if (opt & OPT_REFERENCE) {
264 xstat(filename, &statbuf);
265 ts.tv_sec = statbuf.st_mtime;
266 #if ENABLE_FEATURE_DATE_NANO
267 ts.tv_nsec = statbuf.st_mtim.tv_nsec;
268 /* Some toolchains use .st_mtimensec instead of st_mtim.tv_nsec.
269 * If you need #define _SVID_SOURCE 1 to enable st_mtim.tv_nsec,
270 * drop a mail to project mailing list please
274 #if ENABLE_FEATURE_DATE_NANO
275 /* libc has incredibly messy way of doing this,
276 * typically requiring -lrt. We just skip all this mess */
277 syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts);
282 localtime_r(&ts.tv_sec, &tm_time);
284 /* If date string is given, update tm_time, and maybe set date */
285 if (date_str != NULL) {
286 /* Zero out fields - take her back to midnight! */
291 /* Process any date input to UNIX time since 1 Jan 1970 */
292 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) {
293 if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
294 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
296 parse_datestr(date_str, &tm_time);
299 /* Correct any day of week and day of year etc. fields */
300 /* Be sure to recheck dst (but not if date is time_t format) */
301 if (date_str[0] != '@')
302 tm_time.tm_isdst = -1;
303 ts.tv_sec = validate_tm_time(date_str, &tm_time);
305 /* if setting time, set it */
306 if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
307 bb_perror_msg("can't set date");
313 /* Deal with format string */
314 if (fmt_dt2str == NULL) {
316 fmt_dt2str = buf_fmt_dt2str;
317 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
318 /* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */
319 strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S");
322 /* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */
324 fmt_dt2str[i++] = '%';
325 fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z';
327 fmt_dt2str[i] = '\0';
328 } else if (opt & OPT_RFC2822) {
329 /* -R. undo busybox.c setlocale */
330 if (ENABLE_LOCALE_SUPPORT)
331 setlocale(LC_TIME, "C");
332 strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
333 i = sizeof("%a, %d %b %Y %H:%M:%S ")-1;
335 } else { /* default case */
336 fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
339 #if ENABLE_FEATURE_DATE_NANO
341 /* User-specified fmt_dt2str */
342 /* Search for and process "%N" */
343 char *p = fmt_dt2str;
344 while ((p = strchr(p, '%')) != NULL) {
346 unsigned pres, scale;
353 n = strspn(p, "0123456789");
358 /* We have "%[nnn]N" */
364 pres = xatoi_positive(p);
374 fmt_dt2str = xasprintf("%s%0*u%s", fmt_dt2str, pres, (unsigned)ts.tv_nsec / scale, p);
380 #define date_buf bb_common_bufsiz1
381 setup_common_bufsiz();
382 if (*fmt_dt2str == '\0') {
383 /* With no format string, just print a blank line */
386 /* Handle special conversions */
387 if (is_prefixed_with(fmt_dt2str, "%f")) {
388 fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
390 /* Generate output string */
391 strftime(date_buf, COMMON_BUFSIZE, fmt_dt2str, &tm_time);