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);
42 int date_main(int argc, char **argv)
48 char *date_str = NULL;
49 char *date_fmt = NULL;
50 char *filename = 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, &hintfmt_arg));
62 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_TIMESPEC)) {
64 ifmt = 0; /* default is date */
66 static const char *const isoformats[] = {
67 "date", "hours", "minutes", "seconds"
70 for (ifmt = 0; ifmt < 4; ifmt++)
71 if (!strcmp(isofmt_arg, isoformats[ifmt]))
79 /* XXX, date_fmt == NULL from this always */
80 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
81 date_fmt = &argv[optind][1]; /* Skip over the '+' */
82 } else if (date_str == NULL) {
84 date_str = argv[optind];
87 /* Now we have parsed all the information except the date format
88 which depends on whether the clock is being set or read */
92 xstat(filename, &statbuf);
93 tm = statbuf.st_mtime;
96 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
97 /* Zero out fields - take her back to midnight! */
98 if (date_str != NULL) {
103 /* Process any date input to UNIX time since 1 Jan 1970 */
104 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) {
105 strptime(date_str, hintfmt_arg, &tm_time);
106 } else if (strchr(date_str, ':') != NULL) {
107 /* Parse input and assign appropriately to tm_time */
109 if (sscanf(date_str, "%d:%d:%d", &tm_time.tm_hour, &tm_time.tm_min,
110 &tm_time.tm_sec) == 3) {
111 /* no adjustments needed */
112 } else if (sscanf(date_str, "%d:%d", &tm_time.tm_hour,
113 &tm_time.tm_min) == 2) {
114 /* no adjustments needed */
115 } else if (sscanf(date_str, "%d.%d-%d:%d:%d", &tm_time.tm_mon,
116 &tm_time.tm_mday, &tm_time.tm_hour,
117 &tm_time.tm_min, &tm_time.tm_sec) == 5) {
118 /* Adjust dates from 1-12 to 0-11 */
120 } else if (sscanf(date_str, "%d.%d-%d:%d", &tm_time.tm_mon,
122 &tm_time.tm_hour, &tm_time.tm_min) == 4) {
123 /* Adjust dates from 1-12 to 0-11 */
125 } else if (sscanf(date_str, "%d.%d.%d-%d:%d:%d", &tm_time.tm_year,
126 &tm_time.tm_mon, &tm_time.tm_mday,
127 &tm_time.tm_hour, &tm_time.tm_min,
128 &tm_time.tm_sec) == 6) {
129 tm_time.tm_year -= 1900; /* Adjust years */
130 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
131 } else if (sscanf(date_str, "%d.%d.%d-%d:%d", &tm_time.tm_year,
132 &tm_time.tm_mon, &tm_time.tm_mday,
133 &tm_time.tm_hour, &tm_time.tm_min) == 5) {
134 tm_time.tm_year -= 1900; /* Adjust years */
135 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
137 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
143 nr = sscanf(date_str, "%2d%2d%2d%2d%d", &tm_time.tm_mon,
144 &tm_time.tm_mday, &tm_time.tm_hour, &tm_time.tm_min,
147 if (nr < 4 || nr > 5) {
148 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
151 cp = strchr(date_str, '.');
153 nr = sscanf(cp + 1, "%2d", &tm_time.tm_sec);
155 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
159 /* correct for century - minor Y2K problem here? */
160 if (tm_time.tm_year >= 1900) {
161 tm_time.tm_year -= 1900;
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 */
185 if (date_fmt == NULL) {
187 date_fmt = xzalloc(32);
188 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
189 strcpy(date_fmt, "%Y-%m-%d");
207 date_fmt[i] = (opt & DATE_OPT_UTC) ? 'Z' : 'z';
209 } else if (opt & DATE_OPT_RFC2822) {
210 /* Undo busybox.c for date -R */
211 if (ENABLE_LOCALE_SUPPORT)
212 setlocale(LC_TIME, "C");
213 strcpy(date_fmt, "%a, %d %b %Y %H:%M:%S ");
216 } else /* default case */
217 date_fmt = (char*)"%a %b %e %H:%M:%S %Z %Y";
220 #define date_buf bb_common_bufsiz1
221 if (*date_fmt == '\0') {
222 /* With no format string, just print a blank line */
225 /* Handle special conversions */
227 if (strncmp(date_fmt, "%f", 2) == 0) {
228 date_fmt = (char*)"%Y.%m.%d-%H:%M:%S";
231 /* Generate output string */
232 strftime(date_buf, sizeof(date_buf), date_fmt, &tm_time);