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>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
36 /* This 'date' command supports only 2 time setting formats,
37 all the GNU strftime stuff (its in libc, lets use it),
38 setting time using UTC and displaying int, as well as
39 an RFC 822 complient date output for shell scripting
42 /* Input parsing code is always bulky - used heavy duty libc stuff as
43 much as possible, missed out a lot of bounds checking */
45 /* Default input handling to save suprising some people */
47 static struct tm *date_conv_time(struct tm *tm_time, const char *t_string)
51 nr = sscanf(t_string, "%2d%2d%2d%2d%d", &(tm_time->tm_mon),
52 &(tm_time->tm_mday), &(tm_time->tm_hour), &(tm_time->tm_min),
55 if (nr < 4 || nr > 5) {
56 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
59 /* correct for century - minor Y2K problem here? */
60 if (tm_time->tm_year >= 1900) {
61 tm_time->tm_year -= 1900;
71 /* The new stuff for LRP */
73 static struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
77 /* Parse input and assign appropriately to tm_time */
80 *tm_time, sscanf(t_string, "%d:%d:%d", &t.tm_hour, &t.tm_min,
82 /* no adjustments needed */
84 *tm_time, sscanf(t_string, "%d:%d", &t.tm_hour,
86 /* no adjustments needed */
88 *tm_time, sscanf(t_string, "%d.%d-%d:%d:%d", &t.tm_mon,
89 &t.tm_mday, &t.tm_hour, &t.tm_min,
91 /* Adjust dates from 1-12 to 0-11 */
94 *tm_time, sscanf(t_string, "%d.%d-%d:%d", &t.tm_mon,
95 &t.tm_mday, &t.tm_hour, &t.tm_min) == 4) {
96 /* Adjust dates from 1-12 to 0-11 */
99 *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d:%d", &t.tm_year,
100 &t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min,
102 t.tm_year -= 1900; /* Adjust years */
103 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
105 *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d", &t.tm_year,
106 &t.tm_mon, &t.tm_mday, &t.tm_hour,
108 t.tm_year -= 1900; /* Adjust years */
109 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
111 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
117 #define DATE_OPT_RFC2822 0x01
118 #define DATE_OPT_SET 0x02
119 #define DATE_OPT_UTC 0x04
120 #define DATE_OPT_DATE 0x08
121 #ifdef CONFIG_FEATURE_DATE_ISOFMT
122 # define DATE_OPT_TIMESPEC 0x10
125 int date_main(int argc, char **argv)
127 char *date_str = NULL;
128 char *date_fmt = NULL;
137 #ifdef CONFIG_FEATURE_DATE_ISOFMT
141 # define GETOPT_ISOFMT "I::"
143 # define GETOPT_ISOFMT
145 bb_opt_complementaly = "d~ds:s~ds";
146 opt = bb_getopt_ulflags(argc, argv, "Rs:ud:" GETOPT_ISOFMT,
148 #ifdef CONFIG_FEATURE_DATE_ISOFMT
152 set_time = opt & DATE_OPT_SET;
153 utc = opt & DATE_OPT_UTC;
154 if ((utc) && (putenv("TZ=UTC0") != 0)) {
155 bb_error_msg_and_die(bb_msg_memory_exhausted);
157 use_arg = opt & DATE_OPT_DATE;
158 if(opt & 0x80000000UL)
160 #ifdef CONFIG_FEATURE_DATE_ISOFMT
161 if(opt & DATE_OPT_TIMESPEC) {
165 int ifmt_len = bb_strlen(isofmt_arg);
168 && (strncmp(isofmt_arg, "date", ifmt_len) == 0)) {
170 } else if ((ifmt_len <= 5)
171 && (strncmp(isofmt_arg, "hours", ifmt_len) == 0)) {
173 } else if ((ifmt_len <= 7)
174 && (strncmp(isofmt_arg, "minutes", ifmt_len) == 0)) {
176 } else if ((ifmt_len <= 7)
177 && (strncmp(isofmt_arg, "seconds", ifmt_len) == 0)) {
187 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
188 date_fmt = &argv[optind][1]; /* Skip over the '+' */
189 } else if (date_str == NULL) {
191 date_str = argv[optind];
194 /* Now we have parsed all the information except the date format
195 which depends on whether the clock is being set or read */
198 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
199 /* Zero out fields - take her back to midnight! */
200 if (date_str != NULL) {
205 /* Process any date input to UNIX time since 1 Jan 1970 */
206 if (strchr(date_str, ':') != NULL) {
207 date_conv_ftime(&tm_time, date_str);
209 date_conv_time(&tm_time, date_str);
212 /* Correct any day of week and day of year etc. fields */
213 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
214 tm = mktime(&tm_time);
216 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
218 if (utc && (putenv("TZ=UTC0") != 0)) {
219 bb_error_msg_and_die(bb_msg_memory_exhausted);
222 /* if setting time, set it */
223 if (set_time && (stime(&tm) < 0)) {
224 bb_perror_msg("cannot set date");
230 /* Deal with format string */
231 if (date_fmt == NULL) {
232 #ifdef CONFIG_FEATURE_DATE_ISOFMT
235 date_fmt = utc ? "%Y-%m-%dT%H:%M:%SZ" : "%Y-%m-%dT%H:%M:%S%z";
238 date_fmt = utc ? "%Y-%m-%dT%H:%MZ" : "%Y-%m-%dT%H:%M%z";
241 date_fmt = utc ? "%Y-%m-%dT%HZ" : "%Y-%m-%dT%H%z";
244 date_fmt = "%Y-%m-%d";
250 (opt & DATE_OPT_RFC2822
251 ? (utc ? "%a, %e %b %Y %H:%M:%S GMT" :
252 "%a, %e %b %Y %H:%M:%S %z") : "%a %b %e %H:%M:%S %Z %Y");
254 #ifdef CONFIG_FEATURE_DATE_ISOFMT
258 } else if (*date_fmt == '\0') {
259 /* Imitate what GNU 'date' does with NO format string! */
264 /* Handle special conversions */
266 if (strncmp(date_fmt, "%f", 2) == 0) {
267 date_fmt = "%Y.%m.%d-%H:%M:%S";
270 /* Print OUTPUT (after ALL that!) */
271 t_buff = xmalloc(201);
272 strftime(t_buff, 200, date_fmt, &tm_time);