2 * Mini date implementation for busybox
4 * by Matthew Grant <grantma@anathoth.gen.nz>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #define BB_DECLARE_EXTERN
24 #define bb_need_invalid_date
25 #define bb_need_memory_exhausted
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 static const char date_usage[] = "date [OPTION]... [+FORMAT]\n"
42 " or: date [OPTION] [MMDDhhmm[[CC]YY][.ss]]\n\n"
43 "Display the current time in the given FORMAT, or set the system date.\n"
44 "\nOptions:\n\t-R\t\toutput RFC-822 compliant date string\n"
45 "\t-s\t\tset time described by STRING\n"
46 "\t-u\t\tprint or set Coordinated Universal Time\n";
49 /* Input parsing code is always bulky - used heavy duty libc stuff as
50 much as possible, missed out a lot of bounds checking */
52 /* Default input handling to save suprising some people */
55 date_conv_time(struct tm *tm_time, const char *t_string) {
58 nr = sscanf(t_string, "%2d%2d%2d%2d%d",
65 if(nr < 4 || nr > 5) {
66 fprintf(stderr, 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 */
84 date_conv_ftime(struct tm *tm_time, const char *t_string) {
85 struct tm itm_time, jtm_time, ktm_time, \
86 ltm_time, mtm_time, ntm_time;
95 /* Parse input and assign appropriately to tm_time */
97 if(sscanf(t_string, "%d:%d:%d",
100 &itm_time.tm_sec) == 3 ) {
105 } else if (sscanf(t_string, "%d:%d",
107 &jtm_time.tm_min) == 2) {
112 } else if (sscanf(t_string, "%d.%d-%d:%d:%d",
117 &ktm_time.tm_sec) == 5) {
119 ktm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
123 } else if (sscanf(t_string, "%d.%d-%d:%d",
127 <m_time.tm_min) == 4) {
129 ltm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
133 } else if (sscanf(t_string, "%d.%d.%d-%d:%d:%d",
139 &mtm_time.tm_sec) == 6) {
141 mtm_time.tm_year -= 1900; /* Adjust years */
142 mtm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
146 } else if (sscanf(t_string, "%d.%d.%d-%d:%d",
151 &ntm_time.tm_min) == 5) {
152 ntm_time.tm_year -= 1900; /* Adjust years */
153 ntm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
159 fprintf(stderr, invalid_date, "date", t_string);
167 date_main(int argc, char * * argv)
169 char *date_str = NULL;
170 char *date_fmt = NULL;
180 /* Interpret command line args */
183 while (i > 0 && **argv) {
185 while (i>0 && *++(*argv)) switch (**argv) {
191 if(date_str != NULL) usage ( date_usage);
196 if (putenv ("TZ=UTC0") != 0) {
197 fprintf(stderr, memory_exhausted, "date");
200 /* Look ma, no break. Don't fix it either. */
203 if(date_str != NULL) usage ( date_usage);
210 if ( (date_fmt == NULL) && (strcmp(*argv, "+")==0) )
212 else if (date_str == NULL) {
224 /* Now we have parsed all the information except the date format
225 which depends on whether the clock is being set or read */
228 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
229 /* Zero out fields - take her back to midnight!*/
230 if(date_str != NULL) {
236 /* Process any date input to UNIX time since 1 Jan 1970 */
237 if(date_str != NULL) {
239 if(strchr(date_str, ':') != NULL) {
240 date_conv_ftime(&tm_time, date_str);
242 date_conv_time(&tm_time, date_str);
245 /* Correct any day of week and day of year etc fields */
246 tm = mktime(&tm_time);
248 fprintf(stderr, invalid_date, "date", date_str);
252 /* if setting time, set it */
254 if( stime(&tm) < 0) {
255 fprintf(stderr, "date: can't set date.\n");
263 /* Deal with format string */
264 if(date_fmt == NULL) {
267 ? "%a, %_d %b %Y %H:%M:%S GMT"
268 : "%a, %_d %b %Y %H:%M:%S %z")
269 : "%a %b %e %H:%M:%S %Z %Y");
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";
283 /* Print OUTPUT (after ALL that!) */
284 t_buff = malloc(201);
285 strftime(t_buff, 200, date_fmt, &tm_time);
286 printf("%s\n", t_buff);