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Erik Andersene49d5ec2000-02-08 19:58:47 +00001/* vi: set sw=4 ts=4: */
Eric Andersen2ce1edc1999-10-12 15:42:48 +00002/*
3 * Mini date implementation for busybox
4 *
Eric Andersenc4996011999-10-20 22:08:37 +00005 * by Matthew Grant <grantma@anathoth.gen.nz>
Eric Andersenc7bda1c2004-03-15 08:29:22 +00006 *
Robert Griebl6859d762002-08-05 02:57:12 +00007 * iso-format handling added by Robert Griebl <griebl@gmx.de>
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +00008 * bugfixes and cleanup by Bernhard Fischer
Eric Andersen2ce1edc1999-10-12 15:42:48 +00009 *
Rob Landleyc5789a62006-02-21 05:06:42 +000010 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
Eric Andersen2ce1edc1999-10-12 15:42:48 +000011*/
12
Denis Vlasenkob6adbf12007-05-26 19:00:18 +000013#include "libbb.h"
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000014
Eric Andersenc7bda1c2004-03-15 08:29:22 +000015/* This 'date' command supports only 2 time setting formats,
Eric Andersencc8ed391999-10-05 16:24:54 +000016 all the GNU strftime stuff (its in libc, lets use it),
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000017 setting time using UTC and displaying it, as well as
18 an RFC 2822 compliant date output for shell scripting
Eric Andersencc8ed391999-10-05 16:24:54 +000019 mail commands */
20
Eric Andersencc8ed391999-10-05 16:24:54 +000021/* Input parsing code is always bulky - used heavy duty libc stuff as
22 much as possible, missed out a lot of bounds checking */
23
Eric Andersenaff114c2004-04-14 17:51:38 +000024/* Default input handling to save surprising some people */
Eric Andersencc8ed391999-10-05 16:24:54 +000025
Rob Landley91ed1a42006-07-14 17:59:36 +000026
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
34
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000035static void maybe_set_utc(int opt)
Erik Andersene49d5ec2000-02-08 19:58:47 +000036{
Denis Vlasenko35a4bbe2006-12-13 00:35:21 +000037 if (opt & DATE_OPT_UTC)
Denis Vlasenkofb79a2e2007-07-14 22:07:14 +000038 putenv((char*)"TZ=UTC0");
Eric Andersencc8ed391999-10-05 16:24:54 +000039}
40
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +000041int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Erik Andersene49d5ec2000-02-08 19:58:47 +000042int date_main(int argc, char **argv)
Eric Andersencc8ed391999-10-05 16:24:54 +000043{
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000044 time_t tm;
45 struct tm tm_time;
Denis Vlasenko67b23e62006-10-03 21:00:06 +000046 unsigned opt;
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000047 int ifmt = -1;
Erik Andersene49d5ec2000-02-08 19:58:47 +000048 char *date_str = NULL;
49 char *date_fmt = NULL;
Glenn L McGrath01cdb662004-02-17 12:22:21 +000050 char *filename = NULL;
Eric Andersen8876fb22003-06-20 09:01:58 +000051 char *isofmt_arg;
Rob Landleyc5789a62006-02-21 05:06:42 +000052 char *hintfmt_arg;
Glenn L McGrath03195fc2002-08-23 05:58:38 +000053
Denis Vlasenko09196572007-07-21 13:27:44 +000054 opt_complementary = "d--s:s--d"
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000055 USE_FEATURE_DATE_ISOFMT(":R--I:I--R");
Denis Vlasenkofe7cd642007-08-18 15:32:12 +000056 opt = getopt32(argv, "Rs:ud:r:"
Denis Vlasenko35a4bbe2006-12-13 00:35:21 +000057 USE_FEATURE_DATE_ISOFMT("I::D:"),
58 &date_str, &date_str, &filename
59 USE_FEATURE_DATE_ISOFMT(, &isofmt_arg, &hintfmt_arg));
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000060 maybe_set_utc(opt);
Rob Landleyc5789a62006-02-21 05:06:42 +000061
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000062 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_TIMESPEC)) {
Glenn L McGrath5f115412004-02-17 07:51:31 +000063 if (!isofmt_arg) {
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000064 ifmt = 0; /* default is date */
Glenn L McGrath5f115412004-02-17 07:51:31 +000065 } else {
Denis Vlasenko6ca409e2007-08-12 20:58:27 +000066 static const char *const isoformats[] = {
67 "date", "hours", "minutes", "seconds"
68 };
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000069
70 for (ifmt = 0; ifmt < 4; ifmt++)
Denis Vlasenko240a1cf2007-04-08 16:07:02 +000071 if (!strcmp(isofmt_arg, isoformats[ifmt]))
72 goto found;
73 /* parse error */
74 bb_show_usage();
75 found: ;
Erik Andersene49d5ec2000-02-08 19:58:47 +000076 }
Erik Andersene49d5ec2000-02-08 19:58:47 +000077 }
Robert Griebldf039322002-07-30 23:11:00 +000078
"Vladimir N. Oleynik"3ade65f2005-10-12 14:36:42 +000079 /* XXX, date_fmt == NULL from this always */
Glenn L McGrath03195fc2002-08-23 05:58:38 +000080 if ((date_fmt == NULL) && (optind < argc) && (argv[optind][0] == '+')) {
81 date_fmt = &argv[optind][1]; /* Skip over the '+' */
82 } else if (date_str == NULL) {
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000083 opt |= DATE_OPT_SET;
Eric Andersenadd09fd2000-07-14 18:39:08 +000084 date_str = argv[optind];
Eric Andersenadd09fd2000-07-14 18:39:08 +000085 }
Eric Andersencc8ed391999-10-05 16:24:54 +000086
Erik Andersene49d5ec2000-02-08 19:58:47 +000087 /* Now we have parsed all the information except the date format
88 which depends on whether the clock is being set or read */
Eric Andersencc8ed391999-10-05 16:24:54 +000089
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000090 if (filename) {
Glenn L McGrath01cdb662004-02-17 12:22:21 +000091 struct stat statbuf;
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +000092 xstat(filename, &statbuf);
93 tm = statbuf.st_mtime;
94 } else
95 time(&tm);
Erik Andersene49d5ec2000-02-08 19:58:47 +000096 memcpy(&tm_time, localtime(&tm), sizeof(tm_time));
97 /* Zero out fields - take her back to midnight! */
98 if (date_str != NULL) {
99 tm_time.tm_sec = 0;
100 tm_time.tm_min = 0;
101 tm_time.tm_hour = 0;
Eric Andersencc8ed391999-10-05 16:24:54 +0000102
Glenn L McGrath5f115412004-02-17 07:51:31 +0000103 /* Process any date input to UNIX time since 1 Jan 1970 */
Rob Landleyc5789a62006-02-21 05:06:42 +0000104 if (ENABLE_FEATURE_DATE_ISOFMT && (opt & DATE_OPT_HINT)) {
105 strptime(date_str, hintfmt_arg, &tm_time);
106 } else if (strchr(date_str, ':') != NULL) {
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +0000107 /* Parse input and assign appropriately to tm_time */
108
109 if (sscanf(date_str, "%d:%d:%d", &tm_time.tm_hour, &tm_time.tm_min,
110 &tm_time.tm_sec) == 3) {
111 /* no adjustments needed */
112 } else if (sscanf(date_str, "%d:%d", &tm_time.tm_hour,
113 &tm_time.tm_min) == 2) {
114 /* no adjustments needed */
115 } else if (sscanf(date_str, "%d.%d-%d:%d:%d", &tm_time.tm_mon,
116 &tm_time.tm_mday, &tm_time.tm_hour,
117 &tm_time.tm_min, &tm_time.tm_sec) == 5) {
118 /* Adjust dates from 1-12 to 0-11 */
119 tm_time.tm_mon -= 1;
120 } else if (sscanf(date_str, "%d.%d-%d:%d", &tm_time.tm_mon,
121 &tm_time.tm_mday,
122 &tm_time.tm_hour, &tm_time.tm_min) == 4) {
123 /* Adjust dates from 1-12 to 0-11 */
124 tm_time.tm_mon -= 1;
125 } else if (sscanf(date_str, "%d.%d.%d-%d:%d:%d", &tm_time.tm_year,
126 &tm_time.tm_mon, &tm_time.tm_mday,
127 &tm_time.tm_hour, &tm_time.tm_min,
128 &tm_time.tm_sec) == 6) {
129 tm_time.tm_year -= 1900; /* Adjust years */
130 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
131 } else if (sscanf(date_str, "%d.%d.%d-%d:%d", &tm_time.tm_year,
132 &tm_time.tm_mon, &tm_time.tm_mday,
133 &tm_time.tm_hour, &tm_time.tm_min) == 5) {
134 tm_time.tm_year -= 1900; /* Adjust years */
135 tm_time.tm_mon -= 1; /* Adjust dates from 1-12 to 0-11 */
136 } else {
137 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
138 }
Erik Andersene49d5ec2000-02-08 19:58:47 +0000139 } else {
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +0000140 int nr;
141 char *cp;
142
143 nr = sscanf(date_str, "%2d%2d%2d%2d%d", &tm_time.tm_mon,
144 &tm_time.tm_mday, &tm_time.tm_hour, &tm_time.tm_min,
145 &tm_time.tm_year);
146
147 if (nr < 4 || nr > 5) {
148 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
149 }
150
151 cp = strchr(date_str, '.');
152 if (cp) {
153 nr = sscanf(cp + 1, "%2d", &tm_time.tm_sec);
154 if (nr != 1) {
155 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
156 }
157 }
158
159 /* correct for century - minor Y2K problem here? */
160 if (tm_time.tm_year >= 1900) {
161 tm_time.tm_year -= 1900;
162 }
163 /* adjust date */
164 tm_time.tm_mon -= 1;
Erik Andersene49d5ec2000-02-08 19:58:47 +0000165 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000166
Eric Andersen77d92682001-05-23 20:32:09 +0000167 /* Correct any day of week and day of year etc. fields */
Manuel Novoa III b511f9c2003-07-23 23:24:31 +0000168 tm_time.tm_isdst = -1; /* Be sure to recheck dst. */
Erik Andersene49d5ec2000-02-08 19:58:47 +0000169 tm = mktime(&tm_time);
Glenn L McGrath03195fc2002-08-23 05:58:38 +0000170 if (tm < 0) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000171 bb_error_msg_and_die(bb_msg_invalid_date, date_str);
Glenn L McGrath03195fc2002-08-23 05:58:38 +0000172 }
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +0000173 maybe_set_utc(opt);
Eric Andersencc8ed391999-10-05 16:24:54 +0000174
Erik Andersene49d5ec2000-02-08 19:58:47 +0000175 /* if setting time, set it */
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +0000176 if ((opt & DATE_OPT_SET) && stime(&tm) < 0) {
Manuel Novoa III cad53642003-03-19 09:13:01 +0000177 bb_perror_msg("cannot set date");
Erik Andersene49d5ec2000-02-08 19:58:47 +0000178 }
179 }
Eric Andersencc8ed391999-10-05 16:24:54 +0000180
Erik Andersene49d5ec2000-02-08 19:58:47 +0000181 /* Display output */
Eric Andersencc8ed391999-10-05 16:24:54 +0000182
Erik Andersene49d5ec2000-02-08 19:58:47 +0000183 /* Deal with format string */
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +0000184
Erik Andersene49d5ec2000-02-08 19:58:47 +0000185 if (date_fmt == NULL) {
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +0000186 int i;
187 date_fmt = xzalloc(32);
188 if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
189 strcpy(date_fmt, "%Y-%m-%d");
190 if (ifmt > 0) {
191 i = 8;
192 date_fmt[i++] = 'T';
193 date_fmt[i++] = '%';
194 date_fmt[i++] = 'H';
195 if (ifmt > 1) {
196 date_fmt[i++] = ':';
197 date_fmt[i++] = '%';
198 date_fmt[i++] = 'M';
199 }
200 if (ifmt > 2) {
201 date_fmt[i++] = ':';
202 date_fmt[i++] = '%';
203 date_fmt[i++] = 'S';
204 }
Denis Vlasenko240a1cf2007-04-08 16:07:02 +0000205 format_utc:
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +0000206 date_fmt[i++] = '%';
207 date_fmt[i] = (opt & DATE_OPT_UTC) ? 'Z' : 'z';
208 }
209 } else if (opt & DATE_OPT_RFC2822) {
Denis Vlasenko35a4bbe2006-12-13 00:35:21 +0000210 /* Undo busybox.c for date -R */
Denis Vlasenko6dc6ebb2007-01-01 23:53:12 +0000211 if (ENABLE_LOCALE_SUPPORT)
212 setlocale(LC_TIME, "C");
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +0000213 strcpy(date_fmt, "%a, %d %b %Y %H:%M:%S ");
214 i = 22;
215 goto format_utc;
216 } else /* default case */
Denis Vlasenkoa41fdf32007-01-29 22:51:00 +0000217 date_fmt = (char*)"%a %b %e %H:%M:%S %Z %Y";
Erik Andersene49d5ec2000-02-08 19:58:47 +0000218 }
Bernhard Reutner-Fischer73561cc2006-08-28 23:31:54 +0000219
Denis Vlasenko74324c82007-06-04 10:16:52 +0000220#define date_buf bb_common_bufsiz1
Rob Landleyc5789a62006-02-21 05:06:42 +0000221 if (*date_fmt == '\0') {
Rob Landleyc5789a62006-02-21 05:06:42 +0000222 /* With no format string, just print a blank line */
Denis Vlasenko74324c82007-06-04 10:16:52 +0000223 date_buf[0] = '\0';
Rob Landleyc5789a62006-02-21 05:06:42 +0000224 } else {
Rob Landleyc5789a62006-02-21 05:06:42 +0000225 /* Handle special conversions */
Eric Andersencc8ed391999-10-05 16:24:54 +0000226
Rob Landleyc5789a62006-02-21 05:06:42 +0000227 if (strncmp(date_fmt, "%f", 2) == 0) {
Denis Vlasenkoa41fdf32007-01-29 22:51:00 +0000228 date_fmt = (char*)"%Y.%m.%d-%H:%M:%S";
Rob Landleyc5789a62006-02-21 05:06:42 +0000229 }
230
231 /* Generate output string */
Denis Vlasenko74324c82007-06-04 10:16:52 +0000232 strftime(date_buf, sizeof(date_buf), date_fmt, &tm_time);
Rob Landleyf7662da2005-05-28 23:55:26 +0000233 }
Denis Vlasenko74324c82007-06-04 10:16:52 +0000234 puts(date_buf);
Erik Andersene49d5ec2000-02-08 19:58:47 +0000235
Matt Kraai3e856ce2000-12-01 02:55:13 +0000236 return EXIT_SUCCESS;
Eric Andersencc8ed391999-10-05 16:24:54 +0000237}