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
57 OPT_RFC2822 = (1 << 0), /* R */
58 OPT_SET = (1 << 1), /* s */
59 OPT_UTC = (1 << 2), /* u */
60 OPT_DATE = (1 << 3), /* d */
61 OPT_REFERENCE = (1 << 4), /* r */
62 OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */
63 OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */
66 static void maybe_set_utc(int opt)
69 putenv((char*)"TZ=UTC0");
73 static const char date_longopts[] ALIGN1 =
74 "rfc-822\0" No_argument "R"
75 "rfc-2822\0" No_argument "R"
76 "set\0" Required_argument "s"
77 "utc\0" No_argument "u"
78 /*"universal\0" No_argument "u"*/
79 "date\0" Required_argument "d"
80 "reference\0" Required_argument "r"
84 int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
85 int date_main(int argc UNUSED_PARAM, char **argv)
95 char *isofmt_arg = NULL;
97 opt_complementary = "d--s:s--d"
98 IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
99 IF_LONG_OPTS(applet_long_options = date_longopts;)
100 opt = getopt32(argv, "Rs:ud:r:"
101 IF_FEATURE_DATE_ISOFMT("I::D:"),
102 &date_str, &date_str, &filename
103 IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
107 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) {
108 ifmt = 0; /* default is date */
110 static const char isoformats[] ALIGN1 =
111 "date\0""hours\0""minutes\0""seconds\0";
112 ifmt = index_in_strings(isoformats, isofmt_arg);
119 if (argv[0] && argv[0][0] == '+') {
120 fmt_dt2str = &argv[0][1]; /* Skip over the '+' */
123 if (!(opt & (OPT_SET | OPT_DATE))) {
125 date_str = argv[0]; /* can be NULL */
132 /* Now we have parsed all the information except the date format
133 which depends on whether the clock is being set or read */
135 if (opt & OPT_REFERENCE) {
137 xstat(filename, &statbuf);
138 tm = statbuf.st_mtime;
142 localtime_r(&tm, &tm_time);
144 /* If date string is given, update tm_time, and maybe set date */
145 if (date_str != NULL) {
146 /* Zero out fields - take her back to midnight! */
151 /* Process any date input to UNIX time since 1 Jan 1970 */
152 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) {
153 if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
154 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
156 parse_datestr(date_str, &tm_time);
159 /* Correct any day of week and day of year etc. fields */
160 tm_time.tm_isdst = -1; /* Be sure to recheck dst */
161 tm = validate_tm_time(date_str, &tm_time);
165 /* if setting time, set it */
166 if ((opt & OPT_SET) && stime(&tm) < 0) {
167 bb_perror_msg("cannot set date");
173 /* Deal with format string */
174 if (fmt_dt2str == NULL) {
176 fmt_dt2str = xzalloc(32);
177 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
178 strcpy(fmt_dt2str, "%Y-%m-%d");
181 fmt_dt2str[i++] = 'T';
182 fmt_dt2str[i++] = '%';
183 fmt_dt2str[i++] = 'H';
185 fmt_dt2str[i++] = ':';
186 fmt_dt2str[i++] = '%';
187 fmt_dt2str[i++] = 'M';
189 fmt_dt2str[i++] = ':';
190 fmt_dt2str[i++] = '%';
191 fmt_dt2str[i++] = 'S';
195 fmt_dt2str[i++] = '%';
196 fmt_dt2str[i] = (opt & OPT_UTC) ? 'Z' : 'z';
198 } else if (opt & OPT_RFC2822) {
199 /* Undo busybox.c for date -R */
200 if (ENABLE_LOCALE_SUPPORT)
201 setlocale(LC_TIME, "C");
202 strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
205 } else /* default case */
206 fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
209 #define date_buf bb_common_bufsiz1
210 if (*fmt_dt2str == '\0') {
211 /* With no format string, just print a blank line */
214 /* Handle special conversions */
215 if (strncmp(fmt_dt2str, "%f", 2) == 0) {
216 fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
219 /* Generate output string */
220 strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);