blob: 767e0d4a29296f9c224a1013921f4387b82bdec1
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini date implementation for busybox |
4 | * |
5 | * by Matthew Grant <grantma@anathoth.gen.nz> |
6 | * |
7 | * iso-format handling added by Robert Griebl <griebl@gmx.de> |
8 | * bugfixes and cleanup by Bernhard Reutner-Fischer |
9 | * |
10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
11 | */ |
12 | |
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 |
17 | mail commands */ |
18 | |
19 | /* Input parsing code is always bulky - used heavy duty libc stuff as |
20 | much as possible, missed out a lot of bounds checking */ |
21 | |
22 | //applet:IF_DATE(APPLET(date, BB_DIR_BIN, BB_SUID_DROP)) |
23 | |
24 | //kbuild:lib-$(CONFIG_DATE) += date.o |
25 | |
26 | //config:config DATE |
27 | //config: bool "date" |
28 | //config: default y |
29 | //config: help |
30 | //config: date is used to set the system date or display the |
31 | //config: current time in the given format. |
32 | //config: |
33 | //config:config FEATURE_DATE_ISOFMT |
34 | //config: bool "Enable ISO date format output (-I)" |
35 | //config: default y |
36 | //config: depends on DATE |
37 | //config: help |
38 | //config: Enable option (-I) to output an ISO-8601 compliant |
39 | //config: date/time string. |
40 | //config: |
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" |
44 | //config: default n |
45 | //config: depends on DATE # syscall(__NR_clock_gettime) |
46 | //config: select PLATFORM_LINUX |
47 | //config: help |
48 | //config: Support %[num]N format specifier. Adds ~250 bytes of code. |
49 | //config: |
50 | //config:config FEATURE_DATE_COMPAT |
51 | //config: bool "Support weird 'date MMDDhhmm[[YY]YY][.ss]' format" |
52 | //config: default y |
53 | //config: depends on DATE |
54 | //config: help |
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). |
61 | //config: |
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. |
65 | |
66 | /* GNU coreutils 6.9 man page: |
67 | * date [OPTION]... [+FORMAT] |
68 | * date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]] |
69 | * -d, --date=STRING |
70 | * display time described by STRING, not `now' |
71 | * -f, --file=DATEFILE |
72 | * like --date once for each line of DATEFILE |
73 | * -r, --reference=FILE |
74 | * display the last modification time of FILE |
75 | * -R, --rfc-2822 |
76 | * output date and time in RFC 2822 format. |
77 | * Example: Mon, 07 Aug 2006 12:34:56 -0600 |
78 | * --rfc-3339=TIMESPEC |
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 |
83 | * -s, --set=STRING |
84 | * set time described by STRING |
85 | * -u, --utc, --universal |
86 | * print or set Coordinated Universal Time |
87 | * |
88 | * Busybox: |
89 | * long options are not supported |
90 | * -f is 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 |
95 | */ |
96 | |
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" |
109 | //usage: ) |
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" |
115 | //usage: ) |
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'" |
122 | //usage: ) |
123 | //usage: IF_FEATURE_DATE_ISOFMT( |
124 | //usage: "\n -D FMT Use FMT for -d TIME conversion" |
125 | //usage: ) |
126 | //usage: "\n" |
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" |
134 | //usage: ) |
135 | //usage: |
136 | //usage:#define date_example_usage |
137 | //usage: "$ date\n" |
138 | //usage: "Wed Apr 12 18:52:41 MDT 2000\n" |
139 | |
140 | #include "libbb.h" |
141 | #if ENABLE_FEATURE_DATE_NANO |
142 | # include <sys/syscall.h> |
143 | #endif |
144 | |
145 | enum { |
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 */ |
153 | }; |
154 | |
155 | static void maybe_set_utc(int opt) |
156 | { |
157 | if (opt & OPT_UTC) |
158 | putenv((char*)"TZ=UTC0"); |
159 | } |
160 | |
161 | #if ENABLE_LONG_OPTS |
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" |
170 | ; |
171 | #endif |
172 | |
173 | int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
174 | int date_main(int argc UNUSED_PARAM, char **argv) |
175 | { |
176 | struct timespec ts; |
177 | struct tm tm_time; |
178 | char buf_fmt_dt2str[64]; |
179 | unsigned opt; |
180 | int ifmt = -1; |
181 | char *date_str; |
182 | char *fmt_dt2str; |
183 | char *fmt_str2dt; |
184 | char *filename; |
185 | char *isofmt_arg = NULL; |
186 | |
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)); |
194 | argv += optind; |
195 | maybe_set_utc(opt); |
196 | |
197 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) { |
198 | ifmt = 0; /* default is date */ |
199 | if (isofmt_arg) { |
200 | static const char isoformats[] ALIGN1 = |
201 | "date\0""hours\0""minutes\0""seconds\0"; /* ns? */ |
202 | ifmt = index_in_substrings(isoformats, isofmt_arg); |
203 | if (ifmt < 0) |
204 | bb_show_usage(); |
205 | } |
206 | } |
207 | |
208 | fmt_dt2str = NULL; |
209 | if (argv[0] && argv[0][0] == '+') { |
210 | fmt_dt2str = &argv[0][1]; /* skip over the '+' */ |
211 | argv++; |
212 | } |
213 | if (!(opt & (OPT_SET | OPT_DATE))) { |
214 | opt |= OPT_SET; |
215 | date_str = argv[0]; /* can be NULL */ |
216 | if (date_str) { |
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' |
224 | ) |
225 | ) { |
226 | /* Dreaded MMDDhhmm[[CC]YY][.ss] format! |
227 | * It does not match -d or -s format. |
228 | * Some users actually do use it. |
229 | */ |
230 | len -= 8; |
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 */ |
234 | char buf[4]; |
235 | memcpy(buf, date_str + 8, len); |
236 | memmove(date_str + len, date_str, 8); |
237 | memcpy(date_str, buf, len); |
238 | } |
239 | } |
240 | #endif |
241 | argv++; |
242 | } |
243 | } |
244 | if (*argv) |
245 | bb_show_usage(); |
246 | |
247 | /* Now we have parsed all the information except the date format |
248 | * which depends on whether the clock is being set or read */ |
249 | |
250 | if (opt & OPT_REFERENCE) { |
251 | struct stat statbuf; |
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 |
259 | */ |
260 | #endif |
261 | } else { |
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); |
266 | #else |
267 | time(&ts.tv_sec); |
268 | #endif |
269 | } |
270 | localtime_r(&ts.tv_sec, &tm_time); |
271 | |
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! */ |
275 | tm_time.tm_sec = 0; |
276 | tm_time.tm_min = 0; |
277 | tm_time.tm_hour = 0; |
278 | |
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); |
283 | } else { |
284 | parse_datestr(date_str, &tm_time); |
285 | } |
286 | |
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); |
292 | |
293 | maybe_set_utc(opt); |
294 | |
295 | /* if setting time, set it */ |
296 | if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) { |
297 | bb_perror_msg("can't set date"); |
298 | } |
299 | } |
300 | |
301 | /* Display output */ |
302 | |
303 | /* Deal with format string */ |
304 | if (fmt_dt2str == NULL) { |
305 | int i; |
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"); |
310 | i = 8 + 3 * ifmt; |
311 | if (ifmt != 0) { |
312 | /* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */ |
313 | format_utc: |
314 | fmt_dt2str[i++] = '%'; |
315 | fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z'; |
316 | } |
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; |
324 | goto format_utc; |
325 | } else { /* default case */ |
326 | fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y"; |
327 | } |
328 | } |
329 | #if ENABLE_FEATURE_DATE_NANO |
330 | else { |
331 | /* User-specified fmt_dt2str */ |
332 | /* Search for and process "%N" */ |
333 | char *p = fmt_dt2str; |
334 | while ((p = strchr(p, '%')) != NULL) { |
335 | int n, m; |
336 | unsigned pres, scale; |
337 | |
338 | p++; |
339 | if (*p == '%') { |
340 | p++; |
341 | continue; |
342 | } |
343 | n = strspn(p, "0123456789"); |
344 | if (p[n] != 'N') { |
345 | p += n; |
346 | continue; |
347 | } |
348 | /* We have "%[nnn]N" */ |
349 | p[-1] = '\0'; |
350 | p[n] = '\0'; |
351 | scale = 1; |
352 | pres = 9; |
353 | if (n) { |
354 | pres = xatoi_positive(p); |
355 | if (pres == 0) |
356 | pres = 9; |
357 | m = 9 - pres; |
358 | while (--m >= 0) |
359 | scale *= 10; |
360 | } |
361 | |
362 | m = p - fmt_dt2str; |
363 | p += n + 1; |
364 | fmt_dt2str = xasprintf("%s%0*u%s", fmt_dt2str, pres, (unsigned)ts.tv_nsec / scale, p); |
365 | p = fmt_dt2str + m; |
366 | } |
367 | } |
368 | #endif |
369 | |
370 | #define date_buf bb_common_bufsiz1 |
371 | if (*fmt_dt2str == '\0') { |
372 | /* With no format string, just print a blank line */ |
373 | date_buf[0] = '\0'; |
374 | } else { |
375 | /* Handle special conversions */ |
376 | if (strncmp(fmt_dt2str, "%f", 2) == 0) { |
377 | fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S"; |
378 | } |
379 | /* Generate output string */ |
380 | strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time); |
381 | } |
382 | puts(date_buf); |
383 | |
384 | return EXIT_SUCCESS; |
385 | } |
386 |