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 surprising some people */
47 static struct tm *date_conv_time(struct tm *tm_time, const char *t_string)
52 nr = sscanf(t_string, "%2d%2d%2d%2d%d", &(tm_time->tm_mon),
53 &(tm_time->tm_mday), &(tm_time->tm_hour), &(tm_time->tm_min),
56 if (nr < 4 || nr > 5) {
57 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
60 cp = strchr(t_string, '.');
62 nr = sscanf(cp + 1, "%2d", &(tm_time->tm_sec));
64 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
68 /* correct for century - minor Y2K problem here? */
69 if (tm_time->tm_year >= 1900) {
70 tm_time->tm_year -= 1900;
80 /* The new stuff for LRP */
82 static struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
86 /* Parse input and assign appropriately to tm_time */
89 *tm_time, sscanf(t_string, "%d:%d:%d", &t.tm_hour, &t.tm_min,
91 /* no adjustments needed */
93 *tm_time, sscanf(t_string, "%d:%d", &t.tm_hour,
95 /* no adjustments needed */
97 *tm_time, sscanf(t_string, "%d.%d-%d:%d:%d", &t.tm_mon,
98 &t.tm_mday, &t.tm_hour, &t.tm_min,
100 /* Adjust dates from 1-12 to 0-11 */
103 *tm_time, sscanf(t_string, "%d.%d-%d:%d", &t.tm_mon,
104 &t.tm_mday, &t.tm_hour, &t.tm_min) == 4) {
105 /* Adjust dates from 1-12 to 0-11 */
108 *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d:%d", &t.tm_year,
109 &t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min,
111 t.tm_year -= 1900; /* Adjust years */
112 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
114 *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d", &t.tm_year,
115 &t.tm_mon, &t.tm_mday, &t.tm_hour,
117 t.tm_year -= 1900; /* Adjust years */
118 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
120 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
126 #define DATE_OPT_RFC2822 0x01
127 #define DATE_OPT_SET 0x02
128 #define DATE_OPT_UTC 0x04
129 #define DATE_OPT_DATE 0x08
130 #define DATE_OPT_REFERENCE 0x10
131 #ifdef CONFIG_FEATURE_DATE_ISOFMT
132 # define DATE_OPT_TIMESPEC 0x20
135 int date_main(int argc, char **argv)
137 char *date_str = NULL;
138 char *date_fmt = NULL;
146 char *filename = NULL;
148 #ifdef CONFIG_FEATURE_DATE_ISOFMT
152 # define GETOPT_ISOFMT "I::"
154 # define GETOPT_ISOFMT
156 bb_opt_complementaly = "d~ds:s~ds";
157 opt = bb_getopt_ulflags(argc, argv, "Rs:ud:r:" GETOPT_ISOFMT,
158 &date_str, &date_str, &filename
159 #ifdef CONFIG_FEATURE_DATE_ISOFMT
163 set_time = opt & DATE_OPT_SET;
164 utc = opt & DATE_OPT_UTC;
165 if ((utc) && (putenv("TZ=UTC0") != 0)) {
166 bb_error_msg_and_die(bb_msg_memory_exhausted);
168 use_arg = opt & DATE_OPT_DATE;
169 if(opt & 0x80000000UL)
171 #ifdef CONFIG_FEATURE_DATE_ISOFMT
172 if(opt & DATE_OPT_TIMESPEC) {
176 int ifmt_len = bb_strlen(isofmt_arg);
179 && (strncmp(isofmt_arg, "date", ifmt_len) == 0)) {
181 } else if ((ifmt_len <= 5)
182 && (strncmp(isofmt_arg, "hours", ifmt_len) == 0)) {
184 } else if ((ifmt_len <= 7)
185 && (strncmp(isofmt_arg, "minutes", ifmt_len) == 0)) {
187 } else if ((ifmt_len <= 7)
188 && (strncmp(isofmt_arg, "seconds", ifmt_len) == 0)) {
198 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
199 date_fmt = &argv[optind][1]; /* Skip over the '+' */
200 } else if (date_str == NULL) {
202 date_str = argv[optind];
205 /* Now we have parsed all the information except the date format
206 which depends on whether the clock is being set or read */
210 if(stat(filename,&statbuf))
211 bb_perror_msg_and_die("File '%s' not found.\n",filename);
214 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
215 /* Zero out fields - take her back to midnight! */
216 if (date_str != NULL) {
221 /* Process any date input to UNIX time since 1 Jan 1970 */
222 if (strchr(date_str, ':') != NULL) {
223 date_conv_ftime(&tm_time, date_str);
225 date_conv_time(&tm_time, date_str);
228 /* Correct any day of week and day of year etc. fields */
229 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
230 tm = mktime(&tm_time);
232 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
234 if (utc && (putenv("TZ=UTC0") != 0)) {
235 bb_error_msg_and_die(bb_msg_memory_exhausted);
238 /* if setting time, set it */
239 if (set_time && (stime(&tm) < 0)) {
240 bb_perror_msg("cannot set date");
246 /* Deal with format string */
247 if (date_fmt == NULL) {
248 #ifdef CONFIG_FEATURE_DATE_ISOFMT
251 date_fmt = utc ? "%Y-%m-%dT%H:%M:%SZ" : "%Y-%m-%dT%H:%M:%S%z";
254 date_fmt = utc ? "%Y-%m-%dT%H:%MZ" : "%Y-%m-%dT%H:%M%z";
257 date_fmt = utc ? "%Y-%m-%dT%HZ" : "%Y-%m-%dT%H%z";
260 date_fmt = "%Y-%m-%d";
265 date_fmt = (opt & DATE_OPT_RFC2822 ?
266 (utc ? "%a, %d %b %Y %H:%M:%S GMT" :
267 "%a, %d %b %Y %H:%M:%S %z") :
268 "%a %b %e %H:%M:%S %Z %Y");
270 #ifdef CONFIG_FEATURE_DATE_ISOFMT
274 } else if (*date_fmt == '\0') {
275 /* Imitate what GNU 'date' does with NO format string! */
280 /* Handle special conversions */
282 if (strncmp(date_fmt, "%f", 2) == 0) {
283 date_fmt = "%Y.%m.%d-%H:%M:%S";
286 /* Print OUTPUT (after ALL that!) */
287 t_buff = xmalloc(201);
288 strftime(t_buff, 200, date_fmt, &tm_time);