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
35 /* This 'date' command supports only 2 time setting formats,
36 all the GNU strftime stuff (its in libc, lets use it),
37 setting time using UTC and displaying int, as well as
38 an RFC 822 complient date output for shell scripting
41 /* Input parsing code is always bulky - used heavy duty libc stuff as
42 much as possible, missed out a lot of bounds checking */
44 /* Default input handling to save surprising some people */
46 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 cp = strchr(t_string, '.');
61 nr = sscanf(cp + 1, "%2d", &(tm_time->tm_sec));
63 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
67 /* correct for century - minor Y2K problem here? */
68 if (tm_time->tm_year >= 1900) {
69 tm_time->tm_year -= 1900;
79 /* The new stuff for LRP */
81 static struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
85 /* Parse input and assign appropriately to tm_time */
88 *tm_time, sscanf(t_string, "%d:%d:%d", &t.tm_hour, &t.tm_min,
90 /* no adjustments needed */
92 *tm_time, sscanf(t_string, "%d:%d", &t.tm_hour,
94 /* no adjustments needed */
96 *tm_time, sscanf(t_string, "%d.%d-%d:%d:%d", &t.tm_mon,
97 &t.tm_mday, &t.tm_hour, &t.tm_min,
99 /* Adjust dates from 1-12 to 0-11 */
102 *tm_time, sscanf(t_string, "%d.%d-%d:%d", &t.tm_mon,
103 &t.tm_mday, &t.tm_hour, &t.tm_min) == 4) {
104 /* Adjust dates from 1-12 to 0-11 */
107 *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d:%d", &t.tm_year,
108 &t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min,
110 t.tm_year -= 1900; /* Adjust years */
111 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
113 *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d", &t.tm_year,
114 &t.tm_mon, &t.tm_mday, &t.tm_hour,
116 t.tm_year -= 1900; /* Adjust years */
117 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
119 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
125 #define DATE_OPT_RFC2822 0x01
126 #define DATE_OPT_SET 0x02
127 #define DATE_OPT_UTC 0x04
128 #define DATE_OPT_DATE 0x08
129 #define DATE_OPT_REFERENCE 0x10
130 #ifdef CONFIG_FEATURE_DATE_ISOFMT
131 # define DATE_OPT_TIMESPEC 0x20
134 int date_main(int argc, char **argv)
136 char *date_str = NULL;
137 char *date_fmt = NULL;
144 char *filename = NULL;
146 #ifdef CONFIG_FEATURE_DATE_ISOFMT
150 # define GETOPT_ISOFMT "I::"
152 # define GETOPT_ISOFMT
154 bb_opt_complementally = "!d~ds:s~ds";
155 opt = bb_getopt_ulflags(argc, argv, "Rs:ud:r:" GETOPT_ISOFMT,
156 &date_str, &date_str, &filename
157 #ifdef CONFIG_FEATURE_DATE_ISOFMT
161 set_time = opt & DATE_OPT_SET;
162 utc = opt & DATE_OPT_UTC;
163 if ((utc) && (putenv("TZ=UTC0") != 0)) {
164 bb_error_msg_and_die(bb_msg_memory_exhausted);
166 use_arg = opt & DATE_OPT_DATE;
167 #ifdef CONFIG_FEATURE_DATE_ISOFMT
168 if(opt & DATE_OPT_TIMESPEC) {
172 int ifmt_len = bb_strlen(isofmt_arg);
175 && (strncmp(isofmt_arg, "date", ifmt_len) == 0)) {
177 } else if ((ifmt_len <= 5)
178 && (strncmp(isofmt_arg, "hours", ifmt_len) == 0)) {
180 } else if ((ifmt_len <= 7)
181 && (strncmp(isofmt_arg, "minutes", ifmt_len) == 0)) {
183 } else if ((ifmt_len <= 7)
184 && (strncmp(isofmt_arg, "seconds", ifmt_len) == 0)) {
194 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
195 date_fmt = &argv[optind][1]; /* Skip over the '+' */
196 } else if (date_str == NULL) {
198 date_str = argv[optind];
201 /* Now we have parsed all the information except the date format
202 which depends on whether the clock is being set or read */
206 if(stat(filename,&statbuf))
207 bb_perror_msg_and_die("File '%s' not found.\n",filename);
210 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
211 /* Zero out fields - take her back to midnight! */
212 if (date_str != NULL) {
217 /* Process any date input to UNIX time since 1 Jan 1970 */
218 if (strchr(date_str, ':') != NULL) {
219 date_conv_ftime(&tm_time, date_str);
221 date_conv_time(&tm_time, date_str);
224 /* Correct any day of week and day of year etc. fields */
225 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
226 tm = mktime(&tm_time);
228 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
230 if (utc && (putenv("TZ=UTC0") != 0)) {
231 bb_error_msg_and_die(bb_msg_memory_exhausted);
234 /* if setting time, set it */
235 if (set_time && (stime(&tm) < 0)) {
236 bb_perror_msg("cannot set date");
242 /* Deal with format string */
243 if (date_fmt == NULL) {
244 #ifdef CONFIG_FEATURE_DATE_ISOFMT
247 date_fmt = utc ? "%Y-%m-%dT%H:%M:%SZ" : "%Y-%m-%dT%H:%M:%S%z";
250 date_fmt = utc ? "%Y-%m-%dT%H:%MZ" : "%Y-%m-%dT%H:%M%z";
253 date_fmt = utc ? "%Y-%m-%dT%HZ" : "%Y-%m-%dT%H%z";
256 date_fmt = "%Y-%m-%d";
261 date_fmt = (opt & DATE_OPT_RFC2822 ?
262 (utc ? "%a, %d %b %Y %H:%M:%S GMT" :
263 "%a, %d %b %Y %H:%M:%S %z") :
264 "%a %b %e %H:%M:%S %Z %Y");
266 #ifdef CONFIG_FEATURE_DATE_ISOFMT
270 } else if (*date_fmt == '\0') {
271 /* Imitate what GNU 'date' does with NO format string! */
276 /* Handle special conversions */
278 if (strncmp(date_fmt, "%f", 2) == 0) {
279 date_fmt = "%Y.%m.%d-%H:%M:%S";
283 /* Print OUTPUT (after ALL that!) */
284 RESERVE_CONFIG_BUFFER(t_buff, 201);
285 strftime(t_buff, 200, date_fmt, &tm_time);
287 RELEASE_CONFIG_BUFFER(t_buff);