| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini date implementation for busybox
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| 4 | *
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| 5 | * by Matthew Grant <grantma@anathoth.gen.nz>
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| 6 | *
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| 7 | * iso-format handling added by Robert Griebl <griebl@gmx.de>
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| 8 | * bugfixes and cleanup by Bernhard Fischer
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| 9 | *
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| 10 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 11 | */
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| 12 |
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| 13 | #include "libbb.h"
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| 14 |
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| 15 | /* This 'date' command supports only 2 time setting formats,
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| 16 | all the GNU strftime stuff (its in libc, lets use it),
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| 17 | setting time using UTC and displaying it, as well as
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| 18 | an RFC 2822 compliant date output for shell scripting
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| 19 | mail commands */
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| 20 |
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| 21 | /* Input parsing code is always bulky - used heavy duty libc stuff as
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| 22 | much as possible, missed out a lot of bounds checking */
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| 23 |
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| 24 | /* Default input handling to save surprising some people */
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| 25 |
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| 26 |
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| 27 | #define DATE_OPT_RFC2822 0x01
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| 28 | #define DATE_OPT_SET 0x02
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| 29 | #define DATE_OPT_UTC 0x04
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| 30 | #define DATE_OPT_DATE 0x08
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| 31 | #define DATE_OPT_REFERENCE 0x10
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| 32 | #define DATE_OPT_TIMESPEC 0x20
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| 33 | #define DATE_OPT_HINT 0x40
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| 34 |
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| 35 | static void maybe_set_utc(int opt)
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| 36 | {
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| 37 | if (opt & DATE_OPT_UTC)
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| 38 | putenv((char*)"TZ=UTC0");
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| 39 | }
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| 40 |
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| 41 | int date_main(int argc, char **argv);
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| 42 | int date_main(int argc, char **argv)
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| 43 | {
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| 44 | time_t tm;
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| 45 | struct tm tm_time;
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| 46 | unsigned opt;
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| 47 | int ifmt = -1;
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| 48 | char *date_str = NULL;
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| 49 | char *date_fmt = NULL;
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| 50 | char *filename = NULL;
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| 51 | char *isofmt_arg;
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| 52 | char *hintfmt_arg;
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| 53 |
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| 54 | opt_complementary = "d--s:s--d"
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| 55 | USE_FEATURE_DATE_ISOFMT(":R--I:I--R");
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| 56 | opt = getopt32(argv, "Rs:ud:r:"
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| 57 | USE_FEATURE_DATE_ISOFMT("I::D:"),
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| 58 | &date_str, &date_str, &filename
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| 59 | USE_FEATURE_DATE_ISOFMT(, &isofmt_arg, &hintfmt_arg));
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| 60 | maybe_set_utc(opt);
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| 61 |
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| 62 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_TIMESPEC)) {
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| 63 | if (!isofmt_arg) {
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| 64 | ifmt = 0; /* default is date */
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| 65 | } else {
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| 66 | static const char *const isoformats[] = {
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| 67 | "date", "hours", "minutes", "seconds"
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| 68 | };
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| 69 |
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| 70 | for (ifmt = 0; ifmt < 4; ifmt++)
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| 71 | if (!strcmp(isofmt_arg, isoformats[ifmt]))
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| 72 | goto found;
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| 73 | /* parse error */
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| 74 | bb_show_usage();
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| 75 | found: ;
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| 76 | }
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| 77 | }
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| 78 |
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| 79 | /* XXX, date_fmt == NULL from this always */
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| 80 | if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
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| 81 | date_fmt = &argv[optind][1]; /* Skip over the '+' */
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| 82 | } else if (date_str == NULL) {
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| 83 | opt |= DATE_OPT_SET;
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| 84 | date_str = argv[optind];
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| 85 | }
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| 86 |
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| 87 | /* Now we have parsed all the information except the date format
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| 88 | which depends on whether the clock is being set or read */
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| 89 |
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| 90 | if (filename) {
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| 91 | struct stat statbuf;
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| 92 | xstat(filename, &statbuf);
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| 93 | tm = statbuf.st_mtime;
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| 94 | } else
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| 95 | time(&tm);
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| 96 | memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
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| 97 | /* Zero out fields - take her back to midnight! */
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| 98 | if (date_str != NULL) {
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| 99 | tm_time.tm_sec = 0;
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| 100 | tm_time.tm_min = 0;
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| 101 | tm_time.tm_hour = 0;
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| 102 |
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| 103 | /* Process any date input to UNIX time since 1 Jan 1970 */
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| 104 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) {
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| 105 | strptime(date_str, hintfmt_arg, &tm_time);
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| 106 | } else if (strchr(date_str, ':') != NULL) {
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| 107 | /* Parse input and assign appropriately to tm_time */
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| 108 |
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| 109 | if (sscanf(date_str, "%d:%d:%d", &tm_time.tm_hour, &tm_time.tm_min,
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| 110 | &tm_time.tm_sec) == 3) {
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| 111 | /* no adjustments needed */
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| 112 | } else if (sscanf(date_str, "%d:%d", &tm_time.tm_hour,
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| 113 | &tm_time.tm_min) == 2) {
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| 114 | /* no adjustments needed */
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| 115 | } else if (sscanf(date_str, "%d.%d-%d:%d:%d", &tm_time.tm_mon,
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| 116 | &tm_time.tm_mday, &tm_time.tm_hour,
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| 117 | &tm_time.tm_min, &tm_time.tm_sec) == 5) {
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| 118 | /* Adjust dates from 1-12 to 0-11 */
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| 119 | tm_time.tm_mon -= 1;
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| 120 | } else if (sscanf(date_str, "%d.%d-%d:%d", &tm_time.tm_mon,
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| 121 | &tm_time.tm_mday,
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| 122 | &tm_time.tm_hour, &tm_time.tm_min) == 4) {
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| 123 | /* Adjust dates from 1-12 to 0-11 */
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| 124 | tm_time.tm_mon -= 1;
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| 125 | } else if (sscanf(date_str, "%d.%d.%d-%d:%d:%d", &tm_time.tm_year,
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| 126 | &tm_time.tm_mon, &tm_time.tm_mday,
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| 127 | &tm_time.tm_hour, &tm_time.tm_min,
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| 128 | &tm_time.tm_sec) == 6) {
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| 129 | tm_time.tm_year -= 1900; /* Adjust years */
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| 130 | tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
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| 131 | } else if (sscanf(date_str, "%d.%d.%d-%d:%d", &tm_time.tm_year,
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| 132 | &tm_time.tm_mon, &tm_time.tm_mday,
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| 133 | &tm_time.tm_hour, &tm_time.tm_min) == 5) {
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| 134 | tm_time.tm_year -= 1900; /* Adjust years */
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| 135 | tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
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| 136 | } else {
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| 137 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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| 138 | }
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| 139 | } else {
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| 140 | int nr;
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| 141 | char *cp;
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| 142 |
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| 143 | nr = sscanf(date_str, "%2d%2d%2d%2d%d", &tm_time.tm_mon,
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| 144 | &tm_time.tm_mday, &tm_time.tm_hour, &tm_time.tm_min,
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| 145 | &tm_time.tm_year);
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| 146 |
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| 147 | if (nr < 4 || nr > 5) {
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| 148 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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| 149 | }
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| 150 |
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| 151 | cp = strchr(date_str, '.');
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| 152 | if (cp) {
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| 153 | nr = sscanf(cp + 1, "%2d", &tm_time.tm_sec);
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| 154 | if (nr != 1) {
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| 155 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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| 156 | }
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| 157 | }
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| 158 |
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| 159 | /* correct for century - minor Y2K problem here? */
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| 160 | if (tm_time.tm_year >= 1900) {
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| 161 | tm_time.tm_year -= 1900;
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| 162 | }
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| 163 | /* adjust date */
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| 164 | tm_time.tm_mon -= 1;
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| 165 | }
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| 166 |
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| 167 | /* Correct any day of week and day of year etc. fields */
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| 168 | tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
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| 169 | tm = mktime(&tm_time);
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| 170 | if (tm < 0) {
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| 171 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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| 172 | }
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| 173 | maybe_set_utc(opt);
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| 174 |
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| 175 | /* if setting time, set it */
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| 176 | if ((opt & DATE_OPT_SET) && stime(&tm) < 0) {
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| 177 | bb_perror_msg("cannot set date");
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| 178 | }
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| 179 | }
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| 180 |
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| 181 | /* Display output */
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| 182 |
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| 183 | /* Deal with format string */
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| 184 |
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| 185 | if (date_fmt == NULL) {
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| 186 | int i;
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| 187 | date_fmt = xzalloc(32);
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| 188 | if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
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| 189 | strcpy(date_fmt, "%Y-%m-%d");
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| 190 | if (ifmt > 0) {
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| 191 | i = 8;
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| 192 | date_fmt[i++] = 'T';
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| 193 | date_fmt[i++] = '%';
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| 194 | date_fmt[i++] = 'H';
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| 195 | if (ifmt > 1) {
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| 196 | date_fmt[i++] = ':';
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| 197 | date_fmt[i++] = '%';
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| 198 | date_fmt[i++] = 'M';
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| 199 | }
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| 200 | if (ifmt > 2) {
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| 201 | date_fmt[i++] = ':';
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| 202 | date_fmt[i++] = '%';
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| 203 | date_fmt[i++] = 'S';
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| 204 | }
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| 205 | format_utc:
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| 206 | date_fmt[i++] = '%';
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| 207 | date_fmt[i] = (opt & DATE_OPT_UTC) ? 'Z' : 'z';
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| 208 | }
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| 209 | } else if (opt & DATE_OPT_RFC2822) {
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| 210 | /* Undo busybox.c for date -R */
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| 211 | if (ENABLE_LOCALE_SUPPORT)
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| 212 | setlocale(LC_TIME, "C");
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| 213 | strcpy(date_fmt, "%a, %d %b %Y %H:%M:%S ");
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| 214 | i = 22;
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| 215 | goto format_utc;
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| 216 | } else /* default case */
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| 217 | date_fmt = (char*)"%a %b %e %H:%M:%S %Z %Y";
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| 218 | }
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| 219 |
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| 220 | #define date_buf bb_common_bufsiz1
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| 221 | if (*date_fmt == '\0') {
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| 222 | /* With no format string, just print a blank line */
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| 223 | date_buf[0] = '\0';
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| 224 | } else {
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| 225 | /* Handle special conversions */
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| 226 |
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| 227 | if (strncmp(date_fmt, "%f", 2) == 0) {
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| 228 | date_fmt = (char*)"%Y.%m.%d-%H:%M:%S";
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| 229 | }
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| 230 |
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| 231 | /* Generate output string */
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| 232 | strftime(date_buf, sizeof(date_buf), date_fmt, &tm_time);
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| 233 | }
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| 234 | puts(date_buf);
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| 235 |
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| 236 | return EXIT_SUCCESS;
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| 237 | }
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