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