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",
55 &(tm_time->tm_min), &(tm_time->tm_year));
57 if (nr < 4 || nr > 5) {
58 error_msg_and_die(invalid_date, t_string);
61 /* correct for century - minor Y2K problem here? */
62 if (tm_time->tm_year >= 1900)
63 tm_time->tm_year -= 1900;
72 /* The new stuff for LRP */
74 static struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
78 /* Parse input and assign appropriately to tm_time */
80 if (t=*tm_time,sscanf(t_string, "%d:%d:%d",
81 &t.tm_hour, &t.tm_min, &t.tm_sec) == 3) {
82 /* no adjustments needed */
84 } else if (t=*tm_time,sscanf(t_string, "%d:%d",
85 &t.tm_hour, &t.tm_min) == 2) {
86 /* no adjustments needed */
89 } else if (t=*tm_time,sscanf(t_string, "%d.%d-%d:%d:%d",
93 &t.tm_min, &t.tm_sec) == 5) {
95 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
97 } else if (t=*tm_time,sscanf(t_string, "%d.%d-%d:%d",
100 &t.tm_hour, &t.tm_min) == 4) {
102 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
104 } else if (t=*tm_time,sscanf(t_string, "%d.%d.%d-%d:%d:%d",
109 &t.tm_min, &t.tm_sec) == 6) {
111 t.tm_year -= 1900; /* Adjust years */
112 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
114 } else if (t=*tm_time,sscanf(t_string, "%d.%d.%d-%d:%d",
118 &t.tm_hour, &t.tm_min) == 5) {
119 t.tm_year -= 1900; /* Adjust years */
120 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
123 error_msg_and_die(invalid_date, t_string);
130 int date_main(int argc, char **argv)
132 char *date_str = NULL;
133 char *date_fmt = NULL;
143 #ifdef CONFIG_FEATURE_DATE_ISOFMT
145 #define GETOPT_ISOFMT "I::"
147 #define GETOPT_ISOFMT
150 /* Interpret command line args */
151 while ((c = getopt(argc, argv, "Rs:ud:" GETOPT_ISOFMT )) != EOF) {
158 if ((date_str != NULL) || ((date_str = optarg) == NULL)) {
164 if (putenv("TZ=UTC0") != 0)
165 error_msg_and_die(memory_exhausted);
169 if ((date_str != NULL) || ((date_str = optarg) == NULL))
172 #ifdef CONFIG_FEATURE_DATE_ISOFMT
177 int ifmt_len = xstrlen ( optarg );
179 if (( ifmt_len <= 4 ) && ( strncmp ( optarg, "date", ifmt_len ) == 0 ))
181 else if (( ifmt_len <= 5 ) && ( strncmp ( optarg, "hours", ifmt_len ) == 0 ))
183 else if (( ifmt_len <= 7 ) && ( strncmp ( optarg, "minutes", ifmt_len ) == 0 ))
185 else if (( ifmt_len <= 7 ) && ( strncmp ( optarg, "seconds", ifmt_len ) == 0 ))
189 break; // else show_usage();
197 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+'))
198 date_fmt = &argv[optind][1]; /* Skip over the '+' */
199 else if (date_str == NULL) {
201 date_str = argv[optind];
205 error_msg("date_str='%s' date_fmt='%s'\n", date_str, date_fmt);
210 /* Now we have parsed all the information except the date format
211 which depends on whether the clock is being set or read */
214 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
215 /* Zero out fields - take her back to midnight! */
216 if (date_str != NULL) {
222 /* Process any date input to UNIX time since 1 Jan 1970 */
223 if (date_str != NULL) {
225 if (strchr(date_str, ':') != NULL) {
226 date_conv_ftime(&tm_time, date_str);
228 date_conv_time(&tm_time, date_str);
231 /* Correct any day of week and day of year etc. fields */
232 tm = mktime(&tm_time);
234 error_msg_and_die(invalid_date, date_str);
236 if (putenv("TZ=UTC0") != 0)
237 error_msg_and_die(memory_exhausted);
240 /* if setting time, set it */
242 if (stime(&tm) < 0) {
243 perror_msg("cannot set date");
250 /* Deal with format string */
251 if (date_fmt == NULL) {
252 #ifdef CONFIG_FEATURE_DATE_ISOFMT
255 date_fmt = utc ? "%Y-%m-%dT%H:%M:%SZ" : "%Y-%m-%dT%H:%M:%S%z";
258 date_fmt = utc ? "%Y-%m-%dT%H:%MZ" : "%Y-%m-%dT%H:%M%z";
261 date_fmt = utc ? "%Y-%m-%dT%HZ" : "%Y-%m-%dT%H%z";
264 date_fmt = "%Y-%m-%d";
271 ? "%a, %e %b %Y %H:%M:%S GMT"
272 : "%a, %e %b %Y %H:%M:%S %z")
273 : "%a %b %e %H:%M:%S %Z %Y");
275 #ifdef CONFIG_FEATURE_DATE_ISOFMT
279 } else if (*date_fmt == '\0') {
280 /* Imitate what GNU 'date' does with NO format string! */
285 /* Handle special conversions */
287 if (strncmp(date_fmt, "%f", 2) == 0) {
288 date_fmt = "%Y.%m.%d-%H:%M:%S";
291 /* Print OUTPUT (after ALL that!) */
292 t_buff = xmalloc(201);
293 strftime(t_buff, 200, date_fmt, &tm_time);