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 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 ATTRIBUTE_UNUSED, 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 */
84 /* Now we have parsed all the information except the date format
85 which depends on whether the clock is being set or read */
87 if (opt & DATE_OPT_REFERENCE) {
89 xstat(filename, &statbuf);
90 tm = statbuf.st_mtime;
93 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
95 /* If date string is given, update tm_time, and maybe set date */
96 if (date_str != NULL) {
97 /* Zero out fields - take her back to midnight! */
102 /* Process any date input to UNIX time since 1 Jan 1970 */
103 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) {
104 if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
105 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
108 const char *last_colon = strrchr(date_str, ':');
110 if (last_colon != NULL) {
111 /* Parse input and assign appropriately to tm_time */
113 if (sscanf(date_str, "%u:%u%c",
117 /* no adjustments needed */
118 } else if (sscanf(date_str, "%u.%u-%u:%u%c",
119 &tm_time.tm_mon, &tm_time.tm_mday,
120 &tm_time.tm_hour, &tm_time.tm_min,
122 /* Adjust dates from 1-12 to 0-11 */
124 } else if (sscanf(date_str, "%u.%u.%u-%u:%u%c", &tm_time.tm_year,
125 &tm_time.tm_mon, &tm_time.tm_mday,
126 &tm_time.tm_hour, &tm_time.tm_min,
128 tm_time.tm_year -= 1900; /* Adjust years */
129 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
130 } else if (sscanf(date_str, "%u-%u-%u %u:%u%c", &tm_time.tm_year,
131 &tm_time.tm_mon, &tm_time.tm_mday,
132 &tm_time.tm_hour, &tm_time.tm_min,
134 tm_time.tm_year -= 1900; /* Adjust years */
135 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
136 //TODO: coreutils 6.9 also accepts "YYYY-MM-DD HH" (no minutes)
138 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
141 if (sscanf(last_colon + 1, "%u%c", &tm_time.tm_sec, &end) == 1)
143 /* else end != NUL and we error out */
146 if (sscanf(date_str, "%2u%2u%2u%2u%u%c", &tm_time.tm_mon,
147 &tm_time.tm_mday, &tm_time.tm_hour, &tm_time.tm_min,
148 &tm_time.tm_year, &end) < 4)
149 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
150 /* correct for century - minor Y2K problem here? */
151 if (tm_time.tm_year >= 1900) {
152 tm_time.tm_year -= 1900;
157 if (sscanf(strchr(date_str, '.') + 1, "%u%c",
158 &tm_time.tm_sec, &end) == 1)
160 /* else end != NUL and we error out */
164 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
167 /* Correct any day of week and day of year etc. fields */
168 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
169 tm = mktime(&tm_time);
171 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
175 /* if setting time, set it */
176 if ((opt & DATE_OPT_SET) && stime(&tm) < 0) {
177 bb_perror_msg("cannot set date");
183 /* Deal with format string */
184 if (fmt_dt2str == NULL) {
186 fmt_dt2str = xzalloc(32);
187 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
188 strcpy(fmt_dt2str, "%Y-%m-%d");
191 fmt_dt2str[i++] = 'T';
192 fmt_dt2str[i++] = '%';
193 fmt_dt2str[i++] = 'H';
195 fmt_dt2str[i++] = ':';
196 fmt_dt2str[i++] = '%';
197 fmt_dt2str[i++] = 'M';
199 fmt_dt2str[i++] = ':';
200 fmt_dt2str[i++] = '%';
201 fmt_dt2str[i++] = 'S';
205 fmt_dt2str[i++] = '%';
206 fmt_dt2str[i] = (opt & DATE_OPT_UTC) ? 'Z' : 'z';
208 } else if (opt & DATE_OPT_RFC2822) {
209 /* Undo busybox.c for date -R */
210 if (ENABLE_LOCALE_SUPPORT)
211 setlocale(LC_TIME, "C");
212 strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
215 } else /* default case */
216 fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
219 #define date_buf bb_common_bufsiz1
220 if (*fmt_dt2str == '\0') {
221 /* With no format string, just print a blank line */
224 /* Handle special conversions */
225 if (strncmp(fmt_dt2str, "%f", 2) == 0) {
226 fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
229 /* Generate output string */
230 strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);