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 */
87 if (t = *tm_time, sscanf(t_string, "%d:%d:%d", &t.tm_hour, &t.tm_min,
89 /* no adjustments needed */
90 } else if (t = *tm_time, sscanf(t_string, "%d:%d", &t.tm_hour,
92 /* no adjustments needed */
93 } else if (t = *tm_time, sscanf(t_string, "%d.%d-%d:%d:%d", &t.tm_mon,
94 &t.tm_mday, &t.tm_hour,
95 &t.tm_min, &t.tm_sec) == 5) {
96 /* Adjust dates from 1-12 to 0-11 */
98 } else if (t = *tm_time, sscanf(t_string, "%d.%d-%d:%d", &t.tm_mon,
100 &t.tm_hour, &t.tm_min) == 4) {
101 /* Adjust dates from 1-12 to 0-11 */
103 } else if (t = *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d:%d", &t.tm_year,
104 &t.tm_mon, &t.tm_mday,
105 &t.tm_hour, &t.tm_min,
107 t.tm_year -= 1900; /* Adjust years */
108 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
109 } else if (t = *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d", &t.tm_year,
110 &t.tm_mon, &t.tm_mday,
111 &t.tm_hour, &t.tm_min) == 5) {
112 t.tm_year -= 1900; /* Adjust years */
113 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
115 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
121 #define DATE_OPT_RFC2822 0x01
122 #define DATE_OPT_SET 0x02
123 #define DATE_OPT_UTC 0x04
124 #define DATE_OPT_DATE 0x08
125 #define DATE_OPT_REFERENCE 0x10
126 #ifdef CONFIG_FEATURE_DATE_ISOFMT
127 # define DATE_OPT_TIMESPEC 0x20
130 int date_main(int argc, char **argv)
132 char *date_str = NULL;
133 char *date_fmt = NULL;
142 char *filename = NULL;
144 #ifdef CONFIG_FEATURE_DATE_ISOFMT
148 # define GETOPT_ISOFMT "I::"
150 # define GETOPT_ISOFMT
152 bb_opt_complementally = "?:d--s:s--d";
153 opt = bb_getopt_ulflags(argc, argv, "Rs:ud:r:" GETOPT_ISOFMT,
154 &date_str, &date_str, &filename
155 #ifdef CONFIG_FEATURE_DATE_ISOFMT
159 set_time = opt & DATE_OPT_SET;
160 utc = opt & DATE_OPT_UTC;
161 if (utc && putenv("TZ=UTC0") != 0) {
162 bb_error_msg_and_die(bb_msg_memory_exhausted);
165 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 /* XXX, date_fmt == NULL from this always */
195 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
196 date_fmt = &argv[optind][1]; /* Skip over the '+' */
197 } else if (date_str == NULL) {
199 date_str = argv[optind];
202 /* Now we have parsed all the information except the date format
203 which depends on whether the clock is being set or read */
207 if(stat(filename,&statbuf))
208 bb_perror_msg_and_die("File '%s' not found.", filename);
211 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
212 /* Zero out fields - take her back to midnight! */
213 if (date_str != NULL) {
218 /* Process any date input to UNIX time since 1 Jan 1970 */
219 if (strchr(date_str, ':') != NULL) {
220 date_conv_ftime(&tm_time, date_str);
222 date_conv_time(&tm_time, date_str);
225 /* Correct any day of week and day of year etc. fields */
226 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
227 tm = mktime(&tm_time);
229 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
231 if (utc && putenv("TZ=UTC0") != 0) {
232 bb_error_msg_and_die(bb_msg_memory_exhausted);
235 /* if setting time, set it */
236 if (set_time && stime(&tm) < 0) {
237 bb_perror_msg("cannot set date");
243 /* Deal with format string */
244 if (date_fmt == NULL) {
245 #ifdef CONFIG_FEATURE_DATE_ISOFMT
248 date_fmt = utc ? "%Y-%m-%dT%H:%M:%SZ" : "%Y-%m-%dT%H:%M:%S%z";
251 date_fmt = utc ? "%Y-%m-%dT%H:%MZ" : "%Y-%m-%dT%H:%M%z";
254 date_fmt = utc ? "%Y-%m-%dT%HZ" : "%Y-%m-%dT%H%z";
257 date_fmt = "%Y-%m-%d";
262 date_fmt = (opt & DATE_OPT_RFC2822 ?
263 (utc ? "%a, %d %b %Y %H:%M:%S GMT" :
264 "%a, %d %b %Y %H:%M:%S %z") :
265 "%a %b %e %H:%M:%S %Z %Y");
267 #ifdef CONFIG_FEATURE_DATE_ISOFMT
271 } else if (*date_fmt == '\0') {
272 /* Imitate what GNU 'date' does with NO format string! */
277 /* Handle special conversions */
279 if (strncmp(date_fmt, "%f", 2) == 0) {
280 date_fmt = "%Y.%m.%d-%H:%M:%S";
284 /* Print OUTPUT (after ALL that!) */
285 RESERVE_CONFIG_BUFFER(t_buff, 201);
286 strftime(t_buff, 200, date_fmt, &tm_time);
288 RELEASE_CONFIG_BUFFER(t_buff);