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
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 static const char date_usage[] = "date [OPTION]... [+FORMAT]\n"
43 " or: date [OPTION] [MMDDhhmm[[CC]YY][.ss]]\n\n"
44 "Display the current time in the given FORMAT, or set the system date.\n"
45 "\nOptions:\n\t-R\t\toutput RFC-822 compliant date string\n"
46 "\t-s\t\tset time described by STRING\n"
48 "\t-u\t\tprint or set Coordinated Universal Time\n";
51 /* Input parsing code is always bulky - used heavy duty libc stuff as
52 much as possible, missed out a lot of bounds checking */
54 /* Default input handling to save suprising some people */
56 struct tm *date_conv_time(struct tm *tm_time, const char *t_string)
60 nr = sscanf(t_string, "%2d%2d%2d%2d%d",
64 &(tm_time->tm_min), &(tm_time->tm_year));
66 if (nr < 4 || nr > 5) {
67 fatalError(invalid_date, "date", t_string);
70 /* correct for century - minor Y2K problem here? */
71 if (tm_time->tm_year >= 1900)
72 tm_time->tm_year -= 1900;
81 /* The new stuff for LRP */
83 struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
85 struct tm itm_time, jtm_time, ktm_time, ltm_time, mtm_time, ntm_time;
94 /* Parse input and assign appropriately to tm_time */
96 if (sscanf(t_string, "%d:%d:%d",
97 &itm_time.tm_hour, &itm_time.tm_min, &itm_time.tm_sec) == 3) {
102 } else if (sscanf(t_string, "%d:%d",
103 &jtm_time.tm_hour, &jtm_time.tm_min) == 2) {
108 } else if (sscanf(t_string, "%d.%d-%d:%d:%d",
112 &ktm_time.tm_min, &ktm_time.tm_sec) == 5) {
114 ktm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
118 } else if (sscanf(t_string, "%d.%d-%d:%d",
121 <m_time.tm_hour, <m_time.tm_min) == 4) {
123 ltm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
127 } else if (sscanf(t_string, "%d.%d.%d-%d:%d:%d",
132 &mtm_time.tm_min, &mtm_time.tm_sec) == 6) {
134 mtm_time.tm_year -= 1900; /* Adjust years */
135 mtm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
139 } else if (sscanf(t_string, "%d.%d.%d-%d:%d",
143 &ntm_time.tm_hour, &ntm_time.tm_min) == 5) {
144 ntm_time.tm_year -= 1900; /* Adjust years */
145 ntm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
151 fatalError(invalid_date, "date", t_string);
155 int date_main(int argc, char **argv)
157 char *date_str = NULL;
158 char *date_fmt = NULL;
168 /* Interpret command line args */
171 while (i > 0 && **argv) {
173 while (i > 0 && *++(*argv))
180 if (date_str != NULL)
186 if (putenv("TZ=UTC0") != 0)
187 fatalError(memory_exhausted, "date");
188 /* Look ma, no break. Don't fix it either. */
191 if (date_str != NULL)
199 if ((date_fmt == NULL) && (**argv == '+'))
200 date_fmt = *argv + 1; /* Skip over the '+' */
201 else if (date_str == NULL) {
213 /* Now we have parsed all the information except the date format
214 which depends on whether the clock is being set or read */
217 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
218 /* Zero out fields - take her back to midnight! */
219 if (date_str != NULL) {
225 /* Process any date input to UNIX time since 1 Jan 1970 */
226 if (date_str != NULL) {
228 if (strchr(date_str, ':') != NULL) {
229 date_conv_ftime(&tm_time, date_str);
231 date_conv_time(&tm_time, date_str);
234 /* Correct any day of week and day of year etc fields */
235 tm = mktime(&tm_time);
237 fatalError(invalid_date, "date", date_str);
239 /* if setting time, set it */
241 if (stime(&tm) < 0) {
242 fatalError("date: can't set date.\n");
249 /* Deal with format string */
250 if (date_fmt == NULL) {
253 ? "%a, %_d %b %Y %H:%M:%S GMT"
254 : "%a, %_d %b %Y %H:%M:%S %z")
255 : "%a %b %e %H:%M:%S %Z %Y");
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);
272 printf("%s\n", t_buff);