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>
8 * bugfixes and cleanup by Bernhard Reutner-Fischer
10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
13 /* This 'date' command supports only 2 time setting formats,
14 all the GNU strftime stuff (its in libc, lets use it),
15 setting time using UTC and displaying it, as well as
16 an RFC 2822 compliant date output for shell scripting
19 /* Input parsing code is always bulky - used heavy duty libc stuff as
20 much as possible, missed out a lot of bounds checking */
22 /* Default input handling to save surprising some people */
24 /* GNU coreutils 6.9 man page:
25 * date [OPTION]... [+FORMAT]
26 * date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
28 * display time described by STRING, not `now'
30 * like --date once for each line of DATEFILE
31 * -r, --reference=FILE
32 * display the last modification time of FILE
34 * output date and time in RFC 2822 format.
35 * Example: Mon, 07 Aug 2006 12:34:56 -0600
37 * output date and time in RFC 3339 format.
38 * TIMESPEC='date', 'seconds', or 'ns'
39 * Date and time components are separated by a single space:
40 * 2006-08-07 12:34:56-06:00
42 * set time described by STRING
43 * -u, --utc, --universal
44 * print or set Coordinated Universal Time
47 * long options are not supported
49 * -I seems to roughly match --rfc-3339, but -I has _optional_ param
50 * (thus "-I seconds" doesn't work, only "-Iseconds"),
51 * and does not support -Ins
52 * -D FMT is a bbox extension for _input_ conversion of -d DATE
57 OPT_RFC2822 = (1 << 0), /* R */
58 OPT_SET = (1 << 1), /* s */
59 OPT_UTC = (1 << 2), /* u */
60 OPT_DATE = (1 << 3), /* d */
61 OPT_REFERENCE = (1 << 4), /* r */
62 OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */
63 OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */
66 static void maybe_set_utc(int opt)
69 putenv((char*)"TZ=UTC0");
73 static const char date_longopts[] ALIGN1 =
74 "rfc-822\0" No_argument "R"
75 "rfc-2822\0" No_argument "R"
76 "set\0" Required_argument "s"
77 "utc\0" No_argument "u"
78 /* "universal\0" No_argument "u" */
79 "date\0" Required_argument "d"
80 "reference\0" Required_argument "r"
84 int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
85 int date_main(int argc UNUSED_PARAM, char **argv)
88 char buf_fmt_dt2str[64];
96 char *isofmt_arg = NULL;
98 opt_complementary = "d--s:s--d"
99 IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
100 IF_LONG_OPTS(applet_long_options = date_longopts;)
101 opt = getopt32(argv, "Rs:ud:r:"
102 IF_FEATURE_DATE_ISOFMT("I::D:"),
103 &date_str, &date_str, &filename
104 IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
108 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) {
109 ifmt = 0; /* default is date */
111 static const char isoformats[] ALIGN1 =
112 "date\0""hours\0""minutes\0""seconds\0"; /* ns? */
113 ifmt = index_in_substrings(isoformats, isofmt_arg);
120 if (argv[0] && argv[0][0] == '+') {
121 fmt_dt2str = &argv[0][1]; /* skip over the '+' */
124 if (!(opt & (OPT_SET | OPT_DATE))) {
126 date_str = argv[0]; /* can be NULL */
128 #if ENABLE_FEATURE_DATE_COMPAT
129 int len = strspn(date_str, "0123456789");
130 if (date_str[len] == '\0'
131 || (date_str[len] == '.'
132 && isdigit(date_str[len+1])
133 && isdigit(date_str[len+2])
134 && date_str[len+3] == '\0'
137 /* Dreaded MMDDhhmm[[CC]YY][.ss] format!
138 * It does not match -d or -s format.
139 * Some users actually do use it.
142 if (len < 0 || len > 4 || (len & 1))
143 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
144 if (len != 0) { /* move YY or CCYY to front */
146 memcpy(buf, date_str + 8, len);
147 memmove(date_str + len, date_str, 8);
148 memcpy(date_str, buf, len);
158 /* Now we have parsed all the information except the date format
159 * which depends on whether the clock is being set or read */
161 if (opt & OPT_REFERENCE) {
163 xstat(filename, &statbuf);
164 tm = statbuf.st_mtime;
168 localtime_r(&tm, &tm_time);
170 /* If date string is given, update tm_time, and maybe set date */
171 if (date_str != NULL) {
172 /* Zero out fields - take her back to midnight! */
177 /* Process any date input to UNIX time since 1 Jan 1970 */
178 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) {
179 if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
180 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
182 parse_datestr(date_str, &tm_time);
185 /* Correct any day of week and day of year etc. fields */
186 tm_time.tm_isdst = -1; /* Be sure to recheck dst */
187 tm = validate_tm_time(date_str, &tm_time);
191 /* if setting time, set it */
192 if ((opt & OPT_SET) && stime(&tm) < 0) {
193 bb_perror_msg("can't set date");
199 /* Deal with format string */
200 if (fmt_dt2str == NULL) {
202 fmt_dt2str = buf_fmt_dt2str;
203 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
204 /* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */
205 strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S");
208 /* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */
210 fmt_dt2str[i++] = '%';
211 fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z';
213 fmt_dt2str[i] = '\0';
214 } else if (opt & OPT_RFC2822) {
215 /* -R. undo busybox.c setlocale */
216 if (ENABLE_LOCALE_SUPPORT)
217 setlocale(LC_TIME, "C");
218 strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
219 i = sizeof("%a, %d %b %Y %H:%M:%S ")-1;
221 } else { /* default case */
222 fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
226 #define date_buf bb_common_bufsiz1
227 if (*fmt_dt2str == '\0') {
228 /* With no format string, just print a blank line */
231 /* Handle special conversions */
232 if (strncmp(fmt_dt2str, "%f", 2) == 0) {
233 fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
235 /* Generate output string */
236 strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);