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-rw-r--r--coreutils/date.c239
1 files changed, 239 insertions, 0 deletions
diff --git a/coreutils/date.c b/coreutils/date.c
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+++ b/coreutils/date.c
@@ -0,0 +1,239 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini date implementation for busybox
+ *
+ * by Matthew Grant <grantma@anathoth.gen.nz>
+ *
+ * iso-format handling added by Robert Griebl <griebl@gmx.de>
+ * bugfixes and cleanup by Bernhard Reutner-Fischer
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+*/
+
+#include "libbb.h"
+
+/* This 'date' command supports only 2 time setting formats,
+ all the GNU strftime stuff (its in libc, lets use it),
+ setting time using UTC and displaying it, as well as
+ an RFC 2822 compliant date output for shell scripting
+ mail commands */
+
+/* Input parsing code is always bulky - used heavy duty libc stuff as
+ much as possible, missed out a lot of bounds checking */
+
+/* Default input handling to save surprising some people */
+
+
+#define DATE_OPT_RFC2822 0x01
+#define DATE_OPT_SET 0x02
+#define DATE_OPT_UTC 0x04
+#define DATE_OPT_DATE 0x08
+#define DATE_OPT_REFERENCE 0x10
+#define DATE_OPT_TIMESPEC 0x20
+#define DATE_OPT_HINT 0x40
+
+static void maybe_set_utc(int opt)
+{
+ if (opt & DATE_OPT_UTC)
+ putenv((char*)"TZ=UTC0");
+}
+
+int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int date_main(int argc UNUSED_PARAM, char **argv)
+{
+ struct tm tm_time;
+ time_t tm;
+ unsigned opt;
+ int ifmt = -1;
+ char *date_str;
+ char *fmt_dt2str;
+ char *fmt_str2dt;
+ char *filename;
+ char *isofmt_arg = NULL;
+
+ opt_complementary = "d--s:s--d"
+ USE_FEATURE_DATE_ISOFMT(":R--I:I--R");
+ opt = getopt32(argv, "Rs:ud:r:"
+ USE_FEATURE_DATE_ISOFMT("I::D:"),
+ &date_str, &date_str, &filename
+ USE_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
+ argv += optind;
+ maybe_set_utc(opt);
+
+ if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_TIMESPEC)) {
+ ifmt = 0; /* default is date */
+ if (isofmt_arg) {
+ static const char isoformats[] ALIGN1 =
+ "date\0""hours\0""minutes\0""seconds\0";
+ ifmt = index_in_strings(isoformats, isofmt_arg);
+ if (ifmt < 0)
+ bb_show_usage();
+ }
+ }
+
+ fmt_dt2str = NULL;
+ if (argv[0] && argv[0][0] == '+') {
+ fmt_dt2str = &argv[0][1]; /* Skip over the '+' */
+ argv++;
+ }
+ if (!(opt & (DATE_OPT_SET | DATE_OPT_DATE))) {
+ opt |= DATE_OPT_SET;
+ date_str = argv[0]; /* can be NULL */
+ if (date_str)
+ argv++;
+ }
+ if (*argv)
+ bb_show_usage();
+
+ /* Now we have parsed all the information except the date format
+ which depends on whether the clock is being set or read */
+
+ if (opt & DATE_OPT_REFERENCE) {
+ struct stat statbuf;
+ xstat(filename, &statbuf);
+ tm = statbuf.st_mtime;
+ } else
+ time(&tm);
+ memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
+
+ /* If date string is given, update tm_time, and maybe set date */
+ if (date_str != NULL) {
+ /* Zero out fields - take her back to midnight! */
+ tm_time.tm_sec = 0;
+ tm_time.tm_min = 0;
+ tm_time.tm_hour = 0;
+
+ /* Process any date input to UNIX time since 1 Jan 1970 */
+ if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) {
+ if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
+ bb_error_msg_and_die(bb_msg_invalid_date, date_str);
+ } else {
+ char end = '\0';
+ const char *last_colon = strrchr(date_str, ':');
+
+ if (last_colon != NULL) {
+ /* Parse input and assign appropriately to tm_time */
+
+ if (sscanf(date_str, "%u:%u%c",
+ &tm_time.tm_hour,
+ &tm_time.tm_min,
+ &end) >= 2) {
+ /* no adjustments needed */
+ } else if (sscanf(date_str, "%u.%u-%u:%u%c",
+ &tm_time.tm_mon, &tm_time.tm_mday,
+ &tm_time.tm_hour, &tm_time.tm_min,
+ &end) >= 4) {
+ /* Adjust dates from 1-12 to 0-11 */
+ tm_time.tm_mon -= 1;
+ } else if (sscanf(date_str, "%u.%u.%u-%u:%u%c", &tm_time.tm_year,
+ &tm_time.tm_mon, &tm_time.tm_mday,
+ &tm_time.tm_hour, &tm_time.tm_min,
+ &end) >= 5) {
+ tm_time.tm_year -= 1900; /* Adjust years */
+ tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
+ } else if (sscanf(date_str, "%u-%u-%u %u:%u%c", &tm_time.tm_year,
+ &tm_time.tm_mon, &tm_time.tm_mday,
+ &tm_time.tm_hour, &tm_time.tm_min,
+ &end) >= 5) {
+ tm_time.tm_year -= 1900; /* Adjust years */
+ tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
+//TODO: coreutils 6.9 also accepts "YYYY-MM-DD HH" (no minutes)
+ } else {
+ bb_error_msg_and_die(bb_msg_invalid_date, date_str);
+ }
+ if (end == ':') {
+ if (sscanf(last_colon + 1, "%u%c", &tm_time.tm_sec, &end) == 1)
+ end = '\0';
+ /* else end != NUL and we error out */
+ }
+ } else {
+ if (sscanf(date_str, "%2u%2u%2u%2u%u%c", &tm_time.tm_mon,
+ &tm_time.tm_mday, &tm_time.tm_hour, &tm_time.tm_min,
+ &tm_time.tm_year, &end) < 4)
+ bb_error_msg_and_die(bb_msg_invalid_date, date_str);
+ /* correct for century - minor Y2K problem here? */
+ if (tm_time.tm_year >= 1900) {
+ tm_time.tm_year -= 1900;
+ }
+ /* adjust date */
+ tm_time.tm_mon -= 1;
+ if (end == '.') {
+ if (sscanf(strchr(date_str, '.') + 1, "%u%c",
+ &tm_time.tm_sec, &end) == 1)
+ end = '\0';
+ /* else end != NUL and we error out */
+ }
+ }
+ if (end != '\0') {
+ bb_error_msg_and_die(bb_msg_invalid_date, date_str);
+ }
+ }
+ /* Correct any day of week and day of year etc. fields */
+ tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
+ tm = mktime(&tm_time);
+ if (tm < 0) {
+ bb_error_msg_and_die(bb_msg_invalid_date, date_str);
+ }
+ maybe_set_utc(opt);
+
+ /* if setting time, set it */
+ if ((opt & DATE_OPT_SET) && stime(&tm) < 0) {
+ bb_perror_msg("cannot set date");
+ }
+ }
+
+ /* Display output */
+
+ /* Deal with format string */
+ if (fmt_dt2str == NULL) {
+ int i;
+ fmt_dt2str = xzalloc(32);
+ if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
+ strcpy(fmt_dt2str, "%Y-%m-%d");
+ if (ifmt > 0) {
+ i = 8;
+ fmt_dt2str[i++] = 'T';
+ fmt_dt2str[i++] = '%';
+ fmt_dt2str[i++] = 'H';
+ if (ifmt > 1) {
+ fmt_dt2str[i++] = ':';
+ fmt_dt2str[i++] = '%';
+ fmt_dt2str[i++] = 'M';
+ if (ifmt > 2) {
+ fmt_dt2str[i++] = ':';
+ fmt_dt2str[i++] = '%';
+ fmt_dt2str[i++] = 'S';
+ }
+ }
+ format_utc:
+ fmt_dt2str[i++] = '%';
+ fmt_dt2str[i] = (opt & DATE_OPT_UTC) ? 'Z' : 'z';
+ }
+ } else if (opt & DATE_OPT_RFC2822) {
+ /* Undo busybox.c for date -R */
+ if (ENABLE_LOCALE_SUPPORT)
+ setlocale(LC_TIME, "C");
+ strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
+ i = 22;
+ goto format_utc;
+ } else /* default case */
+ fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
+ }
+
+#define date_buf bb_common_bufsiz1
+ if (*fmt_dt2str == '\0') {
+ /* With no format string, just print a blank line */
+ date_buf[0] = '\0';
+ } else {
+ /* Handle special conversions */
+ if (strncmp(fmt_dt2str, "%f", 2) == 0) {
+ fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
+ }
+
+ /* Generate output string */
+ strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);
+ }
+ puts(date_buf);
+
+ return EXIT_SUCCESS;
+}