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");
72 int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
73 int date_main(int argc UNUSED_PARAM, char **argv)
83 char *isofmt_arg = NULL;
85 opt_complementary = "d--s:s--d"
86 IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
87 opt = getopt32(argv, "Rs:ud:r:"
88 IF_FEATURE_DATE_ISOFMT("I::D:"),
89 &date_str, &date_str, &filename
90 IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
94 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) {
95 ifmt = 0; /* default is date */
97 static const char isoformats[] ALIGN1 =
98 "date\0""hours\0""minutes\0""seconds\0";
99 ifmt = index_in_strings(isoformats, isofmt_arg);
106 if (argv[0] && argv[0][0] == '+') {
107 fmt_dt2str = &argv[0][1]; /* Skip over the '+' */
110 if (!(opt & (OPT_SET | OPT_DATE))) {
112 date_str = argv[0]; /* can be NULL */
119 /* Now we have parsed all the information except the date format
120 which depends on whether the clock is being set or read */
122 if (opt & OPT_REFERENCE) {
124 xstat(filename, &statbuf);
125 tm = statbuf.st_mtime;
129 localtime_r(&tm, &tm_time);
131 /* If date string is given, update tm_time, and maybe set date */
132 if (date_str != NULL) {
133 /* Zero out fields - take her back to midnight! */
138 /* Process any date input to UNIX time since 1 Jan 1970 */
139 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) {
140 if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
141 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
143 parse_datestr(date_str, &tm_time);
146 /* Correct any day of week and day of year etc. fields */
147 tm_time.tm_isdst = -1; /* Be sure to recheck dst */
148 tm = validate_tm_time(date_str, &tm_time);
152 /* if setting time, set it */
153 if ((opt & OPT_SET) && stime(&tm) < 0) {
154 bb_perror_msg("cannot set date");
160 /* Deal with format string */
161 if (fmt_dt2str == NULL) {
163 fmt_dt2str = xzalloc(32);
164 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
165 strcpy(fmt_dt2str, "%Y-%m-%d");
168 fmt_dt2str[i++] = 'T';
169 fmt_dt2str[i++] = '%';
170 fmt_dt2str[i++] = 'H';
172 fmt_dt2str[i++] = ':';
173 fmt_dt2str[i++] = '%';
174 fmt_dt2str[i++] = 'M';
176 fmt_dt2str[i++] = ':';
177 fmt_dt2str[i++] = '%';
178 fmt_dt2str[i++] = 'S';
182 fmt_dt2str[i++] = '%';
183 fmt_dt2str[i] = (opt & OPT_UTC) ? 'Z' : 'z';
185 } else if (opt & OPT_RFC2822) {
186 /* Undo busybox.c for date -R */
187 if (ENABLE_LOCALE_SUPPORT)
188 setlocale(LC_TIME, "C");
189 strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
192 } else /* default case */
193 fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
196 #define date_buf bb_common_bufsiz1
197 if (*fmt_dt2str == '\0') {
198 /* With no format string, just print a blank line */
201 /* Handle special conversions */
202 if (strncmp(fmt_dt2str, "%f", 2) == 0) {
203 fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
206 /* Generate output string */
207 strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);