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"
44 #ifndef BB_FEATURE_TRIVIAL_HELP
45 "\nDisplays the current time in the given FORMAT, or sets the system date.\n"
46 "\nOptions:\n\t-R\tOutputs RFC-822 compliant date string\n"
47 "\t-s\tSets time described by STRING\n"
48 "\t-u\tPrints or sets Coordinated Universal Time\n"
53 /* Input parsing code is always bulky - used heavy duty libc stuff as
54 much as possible, missed out a lot of bounds checking */
56 /* Default input handling to save suprising some people */
58 struct tm *date_conv_time(struct tm *tm_time, const char *t_string)
62 nr = sscanf(t_string, "%2d%2d%2d%2d%d",
66 &(tm_time->tm_min), &(tm_time->tm_year));
68 if (nr < 4 || nr > 5) {
69 fatalError(invalid_date, "date", t_string);
72 /* correct for century - minor Y2K problem here? */
73 if (tm_time->tm_year >= 1900)
74 tm_time->tm_year -= 1900;
83 /* The new stuff for LRP */
85 struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
87 struct tm itm_time, jtm_time, ktm_time, ltm_time, mtm_time, ntm_time;
96 /* Parse input and assign appropriately to tm_time */
98 if (sscanf(t_string, "%d:%d:%d",
99 &itm_time.tm_hour, &itm_time.tm_min, &itm_time.tm_sec) == 3) {
104 } else if (sscanf(t_string, "%d:%d",
105 &jtm_time.tm_hour, &jtm_time.tm_min) == 2) {
110 } else if (sscanf(t_string, "%d.%d-%d:%d:%d",
114 &ktm_time.tm_min, &ktm_time.tm_sec) == 5) {
116 ktm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
120 } else if (sscanf(t_string, "%d.%d-%d:%d",
123 <m_time.tm_hour, <m_time.tm_min) == 4) {
125 ltm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
129 } else if (sscanf(t_string, "%d.%d.%d-%d:%d:%d",
134 &mtm_time.tm_min, &mtm_time.tm_sec) == 6) {
136 mtm_time.tm_year -= 1900; /* Adjust years */
137 mtm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
141 } else if (sscanf(t_string, "%d.%d.%d-%d:%d",
145 &ntm_time.tm_hour, &ntm_time.tm_min) == 5) {
146 ntm_time.tm_year -= 1900; /* Adjust years */
147 ntm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
153 fatalError(invalid_date, "date", t_string);
157 int date_main(int argc, char **argv)
159 char *date_str = NULL;
160 char *date_fmt = NULL;
170 /* Interpret command line args */
173 while (i > 0 && **argv) {
175 while (i > 0 && *++(*argv))
182 if (date_str != NULL)
188 if (putenv("TZ=UTC0") != 0)
189 fatalError(memory_exhausted, "date");
193 if (date_str != NULL)
201 if ((date_fmt == NULL) && (**argv == '+'))
202 date_fmt = *argv + 1; /* Skip over the '+' */
203 else if (date_str == NULL) {
215 /* Now we have parsed all the information except the date format
216 which depends on whether the clock is being set or read */
219 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
220 /* Zero out fields - take her back to midnight! */
221 if (date_str != NULL) {
227 /* Process any date input to UNIX time since 1 Jan 1970 */
228 if (date_str != NULL) {
230 if (strchr(date_str, ':') != NULL) {
231 date_conv_ftime(&tm_time, date_str);
233 date_conv_time(&tm_time, date_str);
236 /* Correct any day of week and day of year etc fields */
237 tm = mktime(&tm_time);
239 fatalError(invalid_date, "date", date_str);
241 /* if setting time, set it */
243 if (stime(&tm) < 0) {
244 fatalError("date: can't set date.\n");
251 /* Deal with format string */
252 if (date_fmt == NULL) {
255 ? "%a, %_d %b %Y %H:%M:%S GMT"
256 : "%a, %_d %b %Y %H:%M:%S %z")
257 : "%a %b %e %H:%M:%S %Z %Y");
259 } else if (*date_fmt == '\0') {
260 /* Imitate what GNU 'date' does with NO format string! */
265 /* Handle special conversions */
267 if (strncmp(date_fmt, "%f", 2) == 0) {
268 date_fmt = "%Y.%m.%d-%H:%M:%S";
271 /* Print OUTPUT (after ALL that!) */
272 t_buff = xmalloc(201);
273 strftime(t_buff, 200, date_fmt, &tm_time);
274 printf("%s\n", t_buff);