1 /* vi: set sw=4 ts=4: */
3 * Mini date implementation for busybox
5 * by Matthew Grant <grantma@anathoth.gen.nz>
7 * iso-format handling added by Robert Griebl <griebl@gmx.de>
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
20 /* This 'date' command supports only 2 time setting formats,
21 all the GNU strftime stuff (its in libc, lets use it),
22 setting time using UTC and displaying int, as well as
23 an RFC 822 complient date output for shell scripting
26 /* Input parsing code is always bulky - used heavy duty libc stuff as
27 much as possible, missed out a lot of bounds checking */
29 /* Default input handling to save surprising some people */
31 static struct tm *date_conv_time(struct tm *tm_time, const char *t_string)
36 nr = sscanf(t_string, "%2d%2d%2d%2d%d", &(tm_time->tm_mon),
37 &(tm_time->tm_mday), &(tm_time->tm_hour), &(tm_time->tm_min),
40 if (nr < 4 || nr > 5) {
41 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
44 cp = strchr(t_string, '.');
46 nr = sscanf(cp + 1, "%2d", &(tm_time->tm_sec));
48 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
52 /* correct for century - minor Y2K problem here? */
53 if (tm_time->tm_year >= 1900) {
54 tm_time->tm_year -= 1900;
64 /* The new stuff for LRP */
66 static struct tm *date_conv_ftime(struct tm *tm_time, const char *t_string)
70 /* Parse input and assign appropriately to tm_time */
72 if (t = *tm_time, sscanf(t_string, "%d:%d:%d", &t.tm_hour, &t.tm_min,
74 /* no adjustments needed */
75 } else if (t = *tm_time, sscanf(t_string, "%d:%d", &t.tm_hour,
77 /* no adjustments needed */
78 } else if (t = *tm_time, sscanf(t_string, "%d.%d-%d:%d:%d", &t.tm_mon,
79 &t.tm_mday, &t.tm_hour,
80 &t.tm_min, &t.tm_sec) == 5) {
81 /* Adjust dates from 1-12 to 0-11 */
83 } else if (t = *tm_time, sscanf(t_string, "%d.%d-%d:%d", &t.tm_mon,
85 &t.tm_hour, &t.tm_min) == 4) {
86 /* Adjust dates from 1-12 to 0-11 */
88 } else if (t = *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d:%d", &t.tm_year,
89 &t.tm_mon, &t.tm_mday,
90 &t.tm_hour, &t.tm_min,
92 t.tm_year -= 1900; /* Adjust years */
93 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
94 } else if (t = *tm_time, sscanf(t_string, "%d.%d.%d-%d:%d", &t.tm_year,
95 &t.tm_mon, &t.tm_mday,
96 &t.tm_hour, &t.tm_min) == 5) {
97 t.tm_year -= 1900; /* Adjust years */
98 t.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
100 bb_error_msg_and_die(bb_msg_invalid_date, t_string);
106 #define DATE_OPT_RFC2822 0x01
107 #define DATE_OPT_SET 0x02
108 #define DATE_OPT_UTC 0x04
109 #define DATE_OPT_DATE 0x08
110 #define DATE_OPT_REFERENCE 0x10
111 #define DATE_OPT_TIMESPEC 0x20
112 #define DATE_OPT_HINT 0x40
114 int date_main(int argc, char **argv)
116 char *date_str = NULL;
117 char *date_fmt = NULL;
123 char *filename = NULL;
129 bb_opt_complementally = "?:d--s:s--d";
130 opt = bb_getopt_ulflags(argc, argv, "Rs:ud:r:"
131 USE_FEATURE_DATE_ISOFMT("I::D:"),
132 &date_str, &date_str, &filename
133 USE_FEATURE_DATE_ISOFMT(, &isofmt_arg, &hintfmt_arg));
134 set_time = opt & DATE_OPT_SET;
135 utc = opt & DATE_OPT_UTC;
136 if (utc && putenv("TZ=UTC0") != 0) {
137 bb_error_msg_and_die(bb_msg_memory_exhausted);
140 if(ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_TIMESPEC)) {
144 char *isoformats[]={"date","hours","minutes","seconds"};
146 if(!strcmp(isofmt_arg,isoformats[--ifmt]))
154 /* XXX, date_fmt == NULL from this always */
155 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
156 date_fmt = &argv[optind][1]; /* Skip over the '+' */
157 } else if (date_str == NULL) {
159 date_str = argv[optind];
162 /* Now we have parsed all the information except the date format
163 which depends on whether the clock is being set or read */
167 xstat(filename,&statbuf);
170 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
171 /* Zero out fields - take her back to midnight! */
172 if (date_str != NULL) {
177 /* Process any date input to UNIX time since 1 Jan 1970 */
178 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) {
179 strptime(date_str, hintfmt_arg, &tm_time);
180 } else if (strchr(date_str, ':') != NULL) {
181 date_conv_ftime(&tm_time, date_str);
183 date_conv_time(&tm_time, date_str);
186 /* Correct any day of week and day of year etc. fields */
187 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
188 tm = mktime(&tm_time);
190 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
192 if (utc && putenv("TZ=UTC0") != 0) {
193 bb_error_msg_and_die(bb_msg_memory_exhausted);
196 /* if setting time, set it */
197 if (set_time && stime(&tm) < 0) {
198 bb_perror_msg("cannot set date");
204 /* Deal with format string */
205 if (date_fmt == NULL) {
206 /* Start with the default case */
208 date_fmt = (opt & DATE_OPT_RFC2822 ?
209 (utc ? "%a, %d %b %Y %H:%M:%S GMT" :
210 "%a, %d %b %Y %H:%M:%S %z") :
211 "%a %b %e %H:%M:%S %Z %Y");
213 if (ENABLE_FEATURE_DATE_ISOFMT) {
215 date_fmt = utc ? "%Y-%m-%dT%H:%M:%SZ" : "%Y-%m-%dT%H:%M:%S%z";
217 date_fmt = utc ? "%Y-%m-%dT%H:%MZ" : "%Y-%m-%dT%H:%M%z";
219 date_fmt = utc ? "%Y-%m-%dT%HZ" : "%Y-%m-%dT%H%z";
221 date_fmt = "%Y-%m-%d";
225 if (*date_fmt == '\0') {
227 /* With no format string, just print a blank line */
229 *bb_common_bufsiz1=0;
232 /* Handle special conversions */
234 if (strncmp(date_fmt, "%f", 2) == 0) {
235 date_fmt = "%Y.%m.%d-%H:%M:%S";
238 /* Generate output string */
239 strftime(bb_common_bufsiz1, 200, date_fmt, &tm_time);
241 puts(bb_common_bufsiz1);