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.
15 /* This 'date' command supports only 2 time setting formats,
16 all the GNU strftime stuff (its in libc, lets use it),
17 setting time using UTC and displaying it, as well as
18 an RFC 2822 compliant date output for shell scripting
21 /* Input parsing code is always bulky - used heavy duty libc stuff as
22 much as possible, missed out a lot of bounds checking */
24 /* Default input handling to save surprising some people */
27 #define DATE_OPT_RFC2822 0x01
28 #define DATE_OPT_SET 0x02
29 #define DATE_OPT_UTC 0x04
30 #define DATE_OPT_DATE 0x08
31 #define DATE_OPT_REFERENCE 0x10
32 #define DATE_OPT_TIMESPEC 0x20
33 #define DATE_OPT_HINT 0x40
35 static void maybe_set_utc(int opt)
37 if (opt & DATE_OPT_UTC)
38 putenv((char*)"TZ=UTC0");
41 int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
42 int date_main(int argc UNUSED_PARAM, char **argv)
52 char *isofmt_arg = NULL;
54 opt_complementary = "d--s:s--d"
55 USE_FEATURE_DATE_ISOFMT(":R--I:I--R");
56 opt = getopt32(argv, "Rs:ud:r:"
57 USE_FEATURE_DATE_ISOFMT("I::D:"),
58 &date_str, &date_str, &filename
59 USE_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
63 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_TIMESPEC)) {
64 ifmt = 0; /* default is date */
66 static const char isoformats[] ALIGN1 =
67 "date\0""hours\0""minutes\0""seconds\0";
68 ifmt = index_in_strings(isoformats, isofmt_arg);
75 if (argv[0] && argv[0][0] == '+') {
76 fmt_dt2str = &argv[0][1]; /* Skip over the '+' */
79 if (!(opt & (DATE_OPT_SET | DATE_OPT_DATE))) {
81 date_str = argv[0]; /* can be NULL */
88 /* Now we have parsed all the information except the date format
89 which depends on whether the clock is being set or read */
91 if (opt & DATE_OPT_REFERENCE) {
93 xstat(filename, &statbuf);
94 tm = statbuf.st_mtime;
97 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
99 /* If date string is given, update tm_time, and maybe set date */
100 if (date_str != NULL) {
101 /* Zero out fields - take her back to midnight! */
106 /* Process any date input to UNIX time since 1 Jan 1970 */
107 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) {
108 if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
109 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
112 const char *last_colon = strrchr(date_str, ':');
114 if (last_colon != NULL) {
115 /* Parse input and assign appropriately to tm_time */
117 if (sscanf(date_str, "%u:%u%c",
121 /* no adjustments needed */
122 } else if (sscanf(date_str, "%u.%u-%u:%u%c",
123 &tm_time.tm_mon, &tm_time.tm_mday,
124 &tm_time.tm_hour, &tm_time.tm_min,
126 /* Adjust dates from 1-12 to 0-11 */
128 } else if (sscanf(date_str, "%u.%u.%u-%u:%u%c", &tm_time.tm_year,
129 &tm_time.tm_mon, &tm_time.tm_mday,
130 &tm_time.tm_hour, &tm_time.tm_min,
132 tm_time.tm_year -= 1900; /* Adjust years */
133 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
134 } else if (sscanf(date_str, "%u-%u-%u %u:%u%c", &tm_time.tm_year,
135 &tm_time.tm_mon, &tm_time.tm_mday,
136 &tm_time.tm_hour, &tm_time.tm_min,
138 tm_time.tm_year -= 1900; /* Adjust years */
139 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
140 //TODO: coreutils 6.9 also accepts "YYYY-MM-DD HH" (no minutes)
142 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
145 if (sscanf(last_colon + 1, "%u%c", &tm_time.tm_sec, &end) == 1)
147 /* else end != NUL and we error out */
150 if (sscanf(date_str, "%2u%2u%2u%2u%u%c", &tm_time.tm_mon,
151 &tm_time.tm_mday, &tm_time.tm_hour, &tm_time.tm_min,
152 &tm_time.tm_year, &end) < 4)
153 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
154 /* correct for century - minor Y2K problem here? */
155 if (tm_time.tm_year >= 1900) {
156 tm_time.tm_year -= 1900;
161 if (sscanf(strchr(date_str, '.') + 1, "%u%c",
162 &tm_time.tm_sec, &end) == 1)
164 /* else end != NUL and we error out */
168 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
171 /* Correct any day of week and day of year etc. fields */
172 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
173 tm = mktime(&tm_time);
175 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
179 /* if setting time, set it */
180 if ((opt & DATE_OPT_SET) && stime(&tm) < 0) {
181 bb_perror_msg("cannot set date");
187 /* Deal with format string */
188 if (fmt_dt2str == NULL) {
190 fmt_dt2str = xzalloc(32);
191 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
192 strcpy(fmt_dt2str, "%Y-%m-%d");
195 fmt_dt2str[i++] = 'T';
196 fmt_dt2str[i++] = '%';
197 fmt_dt2str[i++] = 'H';
199 fmt_dt2str[i++] = ':';
200 fmt_dt2str[i++] = '%';
201 fmt_dt2str[i++] = 'M';
203 fmt_dt2str[i++] = ':';
204 fmt_dt2str[i++] = '%';
205 fmt_dt2str[i++] = 'S';
209 fmt_dt2str[i++] = '%';
210 fmt_dt2str[i] = (opt & DATE_OPT_UTC) ? 'Z' : 'z';
212 } else if (opt & DATE_OPT_RFC2822) {
213 /* Undo busybox.c for date -R */
214 if (ENABLE_LOCALE_SUPPORT)
215 setlocale(LC_TIME, "C");
216 strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
219 } else /* default case */
220 fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
223 #define date_buf bb_common_bufsiz1
224 if (*fmt_dt2str == '\0') {
225 /* With no format string, just print a blank line */
228 /* Handle special conversions */
229 if (strncmp(fmt_dt2str, "%f", 2) == 0) {
230 fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
233 /* Generate output string */
234 strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);