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);
118 int date_main(int argc, char **argv)
120 char *date_str = NULL;
121 char *date_fmt = NULL;
131 #ifdef CONFIG_FEATURE_DATE_ISOFMT
135 # define GETOPT_ISOFMT "I::"
137 # define GETOPT_ISOFMT
139 bb_opt_complementaly = "d~ds:s~ds";
140 opt = bb_getopt_ulflags(argc, argv, "Rs:ud:" GETOPT_ISOFMT,
142 #ifdef CONFIG_FEATURE_DATE_ISOFMT
150 if (putenv("TZ=UTC0") != 0)
151 bb_error_msg_and_die(bb_msg_memory_exhausted);
154 if(opt & 0x80000000UL)
156 #ifdef CONFIG_FEATURE_DATE_ISOFMT
161 int ifmt_len = bb_strlen(isofmt_arg);
164 && (strncmp(isofmt_arg, "date", ifmt_len) == 0)) {
166 } else if ((ifmt_len <= 5)
167 && (strncmp(isofmt_arg, "hours", ifmt_len) == 0)) {
169 } else if ((ifmt_len <= 7)
170 && (strncmp(isofmt_arg, "minutes", ifmt_len) == 0)) {
172 } else if ((ifmt_len <= 7)
173 && (strncmp(isofmt_arg, "seconds", ifmt_len) == 0)) {
183 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
184 date_fmt = &argv[optind][1]; /* Skip over the '+' */
185 } else if (date_str == NULL) {
187 date_str = argv[optind];
190 /* Now we have parsed all the information except the date format
191 which depends on whether the clock is being set or read */
194 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
195 /* Zero out fields - take her back to midnight! */
196 if (date_str != NULL) {
202 /* Process any date input to UNIX time since 1 Jan 1970 */
203 if (date_str != NULL) {
205 if (strchr(date_str, ':') != NULL) {
206 date_conv_ftime(&tm_time, date_str);
208 date_conv_time(&tm_time, date_str);
211 /* Correct any day of week and day of year etc. fields */
212 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
213 tm = mktime(&tm_time);
215 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
217 if (utc && (putenv("TZ=UTC0") != 0)) {
218 bb_error_msg_and_die(bb_msg_memory_exhausted);
221 /* if setting time, set it */
222 if (set_time && (stime(&tm) < 0)) {
223 bb_perror_msg("cannot set date");
229 /* Deal with format string */
230 if (date_fmt == NULL) {
231 #ifdef CONFIG_FEATURE_DATE_ISOFMT
234 date_fmt = utc ? "%Y-%m-%dT%H:%M:%SZ" : "%Y-%m-%dT%H:%M:%S%z";
237 date_fmt = utc ? "%Y-%m-%dT%H:%MZ" : "%Y-%m-%dT%H:%M%z";
240 date_fmt = utc ? "%Y-%m-%dT%HZ" : "%Y-%m-%dT%H%z";
243 date_fmt = "%Y-%m-%d";
250 ? (utc ? "%a, %e %b %Y %H:%M:%S GMT" :
251 "%a, %e %b %Y %H:%M:%S %z") : "%a %b %e %H:%M:%S %Z %Y");
253 #ifdef CONFIG_FEATURE_DATE_ISOFMT
257 } else if (*date_fmt == '\0') {
258 /* Imitate what GNU 'date' does with NO format string! */
263 /* Handle special conversions */
265 if (strncmp(date_fmt, "%f", 2) == 0) {
266 date_fmt = "%Y.%m.%d-%H:%M:%S";
269 /* Print OUTPUT (after ALL that!) */
270 t_buff = xmalloc(201);
271 strftime(t_buff, 200, date_fmt, &tm_time);