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 Fischer
10 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
15 /* This 'date' command supports only 2 time setting formats,
16 all the GNU strftime stuff (its in libc, lets use it),
17 setting time using UTC and displaying it, as well as
18 an RFC 2822 compliant date output for shell scripting
21 /* Input parsing code is always bulky - used heavy duty libc stuff as
22 much as possible, missed out a lot of bounds checking */
24 /* Default input handling to save surprising some people */
27 #define DATE_OPT_RFC2822 0x01
28 #define DATE_OPT_SET 0x02
29 #define DATE_OPT_UTC 0x04
30 #define DATE_OPT_DATE 0x08
31 #define DATE_OPT_REFERENCE 0x10
32 #define DATE_OPT_TIMESPEC 0x20
33 #define DATE_OPT_HINT 0x40
35 static void xputenv(char *s)
38 bb_error_msg_and_die(bb_msg_memory_exhausted);
41 static void maybe_set_utc(int opt)
43 if (opt & DATE_OPT_UTC)
47 int date_main(int argc, char **argv)
53 char *date_str = NULL;
54 char *date_fmt = NULL;
55 char *filename = NULL;
59 opt_complementary = "?:d--s:s--d"
60 USE_FEATURE_DATE_ISOFMT(":R--I:I--R");
61 opt = getopt32(argc, argv, "Rs:ud:r:"
62 USE_FEATURE_DATE_ISOFMT("I::D:"),
63 &date_str, &date_str, &filename
64 USE_FEATURE_DATE_ISOFMT(, &isofmt_arg, &hintfmt_arg));
67 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_TIMESPEC)) {
69 ifmt = 0; /* default is date */
71 const char * const isoformats[] =
72 {"date", "hours", "minutes", "seconds"};
74 for (ifmt = 0; ifmt < 4; ifmt++)
75 if (!strcmp(isofmt_arg, isoformats[ifmt])) {
78 if (ifmt == 4) /* parse error */
83 /* XXX, date_fmt == NULL from this always */
84 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
85 date_fmt = &argv[optind][1]; /* Skip over the '+' */
86 } else if (date_str == NULL) {
88 date_str = argv[optind];
91 /* Now we have parsed all the information except the date format
92 which depends on whether the clock is being set or read */
96 xstat(filename, &statbuf);
97 tm = statbuf.st_mtime;
100 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
101 /* Zero out fields - take her back to midnight! */
102 if (date_str != NULL) {
107 /* Process any date input to UNIX time since 1 Jan 1970 */
108 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) {
109 strptime(date_str, hintfmt_arg, &tm_time);
110 } else if (strchr(date_str, ':') != NULL) {
111 /* Parse input and assign appropriately to tm_time */
113 if (sscanf(date_str, "%d:%d:%d", &tm_time.tm_hour, &tm_time.tm_min,
114 &tm_time.tm_sec) == 3) {
115 /* no adjustments needed */
116 } else if (sscanf(date_str, "%d:%d", &tm_time.tm_hour,
117 &tm_time.tm_min) == 2) {
118 /* no adjustments needed */
119 } else if (sscanf(date_str, "%d.%d-%d:%d:%d", &tm_time.tm_mon,
120 &tm_time.tm_mday, &tm_time.tm_hour,
121 &tm_time.tm_min, &tm_time.tm_sec) == 5) {
122 /* Adjust dates from 1-12 to 0-11 */
124 } else if (sscanf(date_str, "%d.%d-%d:%d", &tm_time.tm_mon,
126 &tm_time.tm_hour, &tm_time.tm_min) == 4) {
127 /* Adjust dates from 1-12 to 0-11 */
129 } else if (sscanf(date_str, "%d.%d.%d-%d:%d:%d", &tm_time.tm_year,
130 &tm_time.tm_mon, &tm_time.tm_mday,
131 &tm_time.tm_hour, &tm_time.tm_min,
132 &tm_time.tm_sec) == 6) {
133 tm_time.tm_year -= 1900; /* Adjust years */
134 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
135 } else if (sscanf(date_str, "%d.%d.%d-%d:%d", &tm_time.tm_year,
136 &tm_time.tm_mon, &tm_time.tm_mday,
137 &tm_time.tm_hour, &tm_time.tm_min) == 5) {
138 tm_time.tm_year -= 1900; /* Adjust years */
139 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
141 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
147 nr = sscanf(date_str, "%2d%2d%2d%2d%d", &tm_time.tm_mon,
148 &tm_time.tm_mday, &tm_time.tm_hour, &tm_time.tm_min,
151 if (nr < 4 || nr > 5) {
152 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
155 cp = strchr(date_str, '.');
157 nr = sscanf(cp + 1, "%2d", &tm_time.tm_sec);
159 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
163 /* correct for century - minor Y2K problem here? */
164 if (tm_time.tm_year >= 1900) {
165 tm_time.tm_year -= 1900;
171 /* Correct any day of week and day of year etc. fields */
172 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
173 tm = mktime(&tm_time);
175 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
179 /* if setting time, set it */
180 if ((opt & DATE_OPT_SET) && stime(&tm) < 0) {
181 bb_perror_msg("cannot set date");
187 /* Deal with format string */
189 if (date_fmt == NULL) {
191 date_fmt = xzalloc(32);
192 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
193 strcpy(date_fmt, "%Y-%m-%d");
211 date_fmt[i] = (opt & DATE_OPT_UTC) ? 'Z' : 'z';
213 } else if (opt & DATE_OPT_RFC2822) {
214 /* Undo busybox.c for date -R */
215 if (ENABLE_LOCALE_SUPPORT)
216 setlocale(LC_TIME, "C");
217 strcpy(date_fmt, "%a, %d %b %Y %H:%M:%S ");
220 } else /* default case */
221 date_fmt = "%a %b %e %H:%M:%S %Z %Y";
224 if (*date_fmt == '\0') {
225 /* With no format string, just print a blank line */
226 *bb_common_bufsiz1 = 0;
228 /* Handle special conversions */
230 if (strncmp(date_fmt, "%f", 2) == 0) {
231 date_fmt = "%Y.%m.%d-%H:%M:%S";
234 /* Generate output string */
235 strftime(bb_common_bufsiz1, 200, date_fmt, &tm_time);
237 puts(bb_common_bufsiz1);