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, 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, 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 */
171 while ((c = getopt(argc, argv, "Rs:ud:")) != EOF) {
178 if ((date_str != NULL) || ((date_str = optarg) == NULL))
183 if (putenv("TZ=UTC0") != 0)
184 fatalError(memory_exhausted);
188 if ((date_str != NULL) || ((date_str = optarg) == NULL))
196 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+'))
197 date_fmt = &argv[optind][1]; /* Skip over the '+' */
198 else if (date_str == NULL) {
200 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 */
209 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
210 /* Zero out fields - take her back to midnight! */
211 if (date_str != NULL) {
217 /* Process any date input to UNIX time since 1 Jan 1970 */
218 if (date_str != NULL) {
220 if (strchr(date_str, ':') != NULL) {
221 date_conv_ftime(&tm_time, date_str);
223 date_conv_time(&tm_time, date_str);
226 /* Correct any day of week and day of year etc fields */
227 tm = mktime(&tm_time);
229 fatalError(invalid_date, date_str);
231 /* if setting time, set it */
233 if (stime(&tm) < 0) {
234 fatalError("can't set date.\n");
241 /* Deal with format string */
242 if (date_fmt == NULL) {
245 ? "%a, %_d %b %Y %H:%M:%S GMT"
246 : "%a, %_d %b %Y %H:%M:%S %z")
247 : "%a %b %e %H:%M:%S %Z %Y");
249 } else if (*date_fmt == '\0') {
250 /* Imitate what GNU 'date' does with NO format string! */
255 /* Handle special conversions */
257 if (strncmp(date_fmt, "%f", 2) == 0) {
258 date_fmt = "%Y.%m.%d-%H:%M:%S";
261 /* Print OUTPUT (after ALL that!) */
262 t_buff = xmalloc(201);
263 strftime(t_buff, 200, date_fmt, &tm_time);
264 printf("%s\n", t_buff);