1 /* vi: set sw=4 ts=4: */
3 * Mini date implementation for busybox
5 * by Matthew Grant <grantma@anathoth.gen.nz>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 #define BB_DECLARE_EXTERN
25 #define bb_need_invalid_date
26 #define bb_need_memory_exhausted
37 /* This 'date' command supports only 2 time setting formats,
38 all the GNU strftime stuff (its in libc, lets use it),
39 setting time using UTC and displaying int, as well as
40 an RFC 822 complient date output for shell scripting
43 /* Input parsing code is always bulky - used heavy duty libc stuff as
44 much as possible, missed out a lot of bounds checking */
46 /* Default input handling to save suprising some people */
48 struct tm *date_conv_time(struct tm *tm_time, const char *t_string)
52 nr = sscanf(t_string, "%2d%2d%2d%2d%d",
56 &(tm_time->tm_min), &(tm_time->tm_year));
58 if (nr < 4 || nr > 5) {
59 fatalError(invalid_date, t_string);
62 /* correct for century - minor Y2K problem here? */
63 if (tm_time->tm_year >= 1900)
64 tm_time->tm_year -= 1900;
73 /* The new stuff for LRP */
75 struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
77 struct tm itm_time, jtm_time, ktm_time, ltm_time, mtm_time, ntm_time;
86 /* Parse input and assign appropriately to tm_time */
88 if (sscanf(t_string, "%d:%d:%d",
89 &itm_time.tm_hour, &itm_time.tm_min, &itm_time.tm_sec) == 3) {
94 } else if (sscanf(t_string, "%d:%d",
95 &jtm_time.tm_hour, &jtm_time.tm_min) == 2) {
100 } else if (sscanf(t_string, "%d.%d-%d:%d:%d",
104 &ktm_time.tm_min, &ktm_time.tm_sec) == 5) {
106 ktm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
110 } else if (sscanf(t_string, "%d.%d-%d:%d",
113 <m_time.tm_hour, <m_time.tm_min) == 4) {
115 ltm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
119 } else if (sscanf(t_string, "%d.%d.%d-%d:%d:%d",
124 &mtm_time.tm_min, &mtm_time.tm_sec) == 6) {
126 mtm_time.tm_year -= 1900; /* Adjust years */
127 mtm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
131 } else if (sscanf(t_string, "%d.%d.%d-%d:%d",
135 &ntm_time.tm_hour, &ntm_time.tm_min) == 5) {
136 ntm_time.tm_year -= 1900; /* Adjust years */
137 ntm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
143 fatalError(invalid_date, t_string);
147 int date_main(int argc, char **argv)
149 char *date_str = NULL;
150 char *date_fmt = NULL;
160 /* Interpret command line args */
161 while ((c = getopt(argc, argv, "Rs:ud:")) != EOF) {
168 if ((date_str != NULL) || ((date_str = optarg) == NULL))
173 if (putenv("TZ=UTC0") != 0)
174 fatalError(memory_exhausted);
178 if ((date_str != NULL) || ((date_str = optarg) == NULL))
186 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+'))
187 date_fmt = &argv[optind][1]; /* Skip over the '+' */
188 else if (date_str == NULL) {
190 date_str = argv[optind];
195 /* Now we have parsed all the information except the date format
196 which depends on whether the clock is being set or read */
199 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
200 /* Zero out fields - take her back to midnight! */
201 if (date_str != NULL) {
207 /* Process any date input to UNIX time since 1 Jan 1970 */
208 if (date_str != NULL) {
210 if (strchr(date_str, ':') != NULL) {
211 date_conv_ftime(&tm_time, date_str);
213 date_conv_time(&tm_time, date_str);
216 /* Correct any day of week and day of year etc fields */
217 tm = mktime(&tm_time);
219 fatalError(invalid_date, date_str);
221 /* if setting time, set it */
223 if (stime(&tm) < 0) {
224 fatalError("can't set date.\n");
231 /* Deal with format string */
232 if (date_fmt == NULL) {
235 ? "%a, %_d %b %Y %H:%M:%S GMT"
236 : "%a, %_d %b %Y %H:%M:%S %z")
237 : "%a %b %e %H:%M:%S %Z %Y");
239 } else if (*date_fmt == '\0') {
240 /* Imitate what GNU 'date' does with NO format string! */
245 /* Handle special conversions */
247 if (strncmp(date_fmt, "%f", 2) == 0) {
248 date_fmt = "%Y.%m.%d-%H:%M:%S";
251 /* Print OUTPUT (after ALL that!) */
252 t_buff = xmalloc(201);
253 strftime(t_buff, 200, date_fmt, &tm_time);
254 printf("%s\n", t_buff);