| 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 Reutner-Fischer
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| 9 | *
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| 10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 11 | */
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| 12 |
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| 13 | /* This 'date' command supports only 2 time setting formats,
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| 14 | all the GNU strftime stuff (its in libc, lets use it),
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| 15 | setting time using UTC and displaying it, as well as
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| 16 | an RFC 2822 compliant date output for shell scripting
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| 17 | mail commands */
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| 18 |
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| 19 | /* Input parsing code is always bulky - used heavy duty libc stuff as
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| 20 | much as possible, missed out a lot of bounds checking */
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| 21 |
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| 22 | //applet:IF_DATE(APPLET(date, _BB_DIR_BIN, _BB_SUID_DROP))
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| 23 |
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| 24 | //kbuild:lib-$(CONFIG_DATE) += date.o
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| 25 |
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| 26 | //config:config DATE
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| 27 | //config: bool "date"
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| 28 | //config: default y
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| 29 | //config: help
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| 30 | //config: date is used to set the system date or display the
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| 31 | //config: current time in the given format.
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| 32 | //config:
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| 33 | //config:config FEATURE_DATE_ISOFMT
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| 34 | //config: bool "Enable ISO date format output (-I)"
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| 35 | //config: default y
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| 36 | //config: depends on DATE
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| 37 | //config: help
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| 38 | //config: Enable option (-I) to output an ISO-8601 compliant
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| 39 | //config: date/time string.
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| 40 | //config:
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| 41 | //config:# defaults to "no": stat's nanosecond field is a bit non-portable
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| 42 | //config:config FEATURE_DATE_NANO
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| 43 | //config: bool "Support %[num]N nanosecond format specifier"
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| 44 | //config: default n
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| 45 | //config: depends on DATE && PLATFORM_LINUX # syscall(__NR_clock_gettime)
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| 46 | //config: help
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| 47 | //config: Support %[num]N format specifier. Adds ~250 bytes of code.
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| 48 | //config:
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| 49 | //config:config FEATURE_DATE_COMPAT
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| 50 | //config: bool "Support weird 'date MMDDhhmm[[YY]YY][.ss]' format"
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| 51 | //config: default y
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| 52 | //config: depends on DATE
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| 53 | //config: help
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| 54 | //config: System time can be set by 'date -s DATE' and simply 'date DATE',
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| 55 | //config: but formats of DATE string are different. 'date DATE' accepts
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| 56 | //config: a rather weird MMDDhhmm[[YY]YY][.ss] format with completely
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| 57 | //config: unnatural placement of year between minutes and seconds.
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| 58 | //config: date -s (and other commands like touch -d) use more sensible
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| 59 | //config: formats (for one, ISO format YYYY-MM-DD hh:mm:ss.ssssss).
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| 60 | //config:
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| 61 | //config: With this option off, 'date DATE' is 'date -s DATE' support
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| 62 | //config: the same format. With it on, 'date DATE' additionally supports
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| 63 | //config: MMDDhhmm[[YY]YY][.ss] format.
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| 64 |
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| 65 | /* GNU coreutils 6.9 man page:
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| 66 | * date [OPTION]... [+FORMAT]
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| 67 | * date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
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| 68 | * -d, --date=STRING
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| 69 | * display time described by STRING, not `now'
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| 70 | * -f, --file=DATEFILE
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| 71 | * like --date once for each line of DATEFILE
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| 72 | * -r, --reference=FILE
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| 73 | * display the last modification time of FILE
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| 74 | * -R, --rfc-2822
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| 75 | * output date and time in RFC 2822 format.
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| 76 | * Example: Mon, 07 Aug 2006 12:34:56 -0600
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| 77 | * --rfc-3339=TIMESPEC
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| 78 | * output date and time in RFC 3339 format.
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| 79 | * TIMESPEC='date', 'seconds', or 'ns'
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| 80 | * Date and time components are separated by a single space:
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| 81 | * 2006-08-07 12:34:56-06:00
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| 82 | * -s, --set=STRING
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| 83 | * set time described by STRING
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| 84 | * -u, --utc, --universal
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| 85 | * print or set Coordinated Universal Time
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| 86 | *
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| 87 | * Busybox:
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| 88 | * long options are not supported
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| 89 | * -f is not supported
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| 90 | * -I seems to roughly match --rfc-3339, but -I has _optional_ param
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| 91 | * (thus "-I seconds" doesn't work, only "-Iseconds"),
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| 92 | * and does not support -Ins
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| 93 | * -D FMT is a bbox extension for _input_ conversion of -d DATE
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| 94 | */
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| 95 |
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| 96 | //usage:#define date_trivial_usage
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| 97 | //usage: "[OPTIONS] [+FMT] [TIME]"
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| 98 | //usage:#define date_full_usage "\n\n"
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| 99 | //usage: "Display time (using +FMT), or set time\n"
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| 100 | //usage: "\nOptions:"
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| 101 | //usage: IF_NOT_LONG_OPTS(
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| 102 | //usage: "\n [-s] TIME Set time to TIME"
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| 103 | //usage: "\n -u Work in UTC (don't convert to local time)"
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| 104 | //usage: "\n -R Output RFC-2822 compliant date string"
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| 105 | //usage: ) IF_LONG_OPTS(
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| 106 | //usage: "\n [-s,--set] TIME Set time to TIME"
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| 107 | //usage: "\n -u,--utc Work in UTC (don't convert to local time)"
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| 108 | //usage: "\n -R,--rfc-2822 Output RFC-2822 compliant date string"
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| 109 | //usage: )
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| 110 | //usage: IF_FEATURE_DATE_ISOFMT(
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| 111 | //usage: "\n -I[SPEC] Output ISO-8601 compliant date string"
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| 112 | //usage: "\n SPEC='date' (default) for date only,"
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| 113 | //usage: "\n 'hours', 'minutes', or 'seconds' for date and"
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| 114 | //usage: "\n time to the indicated precision"
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| 115 | //usage: )
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| 116 | //usage: IF_NOT_LONG_OPTS(
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| 117 | //usage: "\n -r FILE Display last modification time of FILE"
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| 118 | //usage: "\n -d TIME Display TIME, not 'now'"
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| 119 | //usage: ) IF_LONG_OPTS(
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| 120 | //usage: "\n -r,--reference FILE Display last modification time of FILE"
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| 121 | //usage: "\n -d,--date TIME Display TIME, not 'now'"
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| 122 | //usage: )
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| 123 | //usage: IF_FEATURE_DATE_ISOFMT(
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| 124 | //usage: "\n -D FMT Use FMT for -d TIME conversion"
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| 125 | //usage: )
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| 126 | //usage: "\n"
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| 127 | //usage: "\nRecognized TIME formats:"
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| 128 | //usage: "\n hh:mm[:ss]"
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| 129 | //usage: "\n [YYYY.]MM.DD-hh:mm[:ss]"
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| 130 | //usage: "\n YYYY-MM-DD hh:mm[:ss]"
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| 131 | //usage: "\n [[[[[YY]YY]MM]DD]hh]mm[.ss]"
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| 132 | //usage:
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| 133 | //usage:#define date_example_usage
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| 134 | //usage: "$ date\n"
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| 135 | //usage: "Wed Apr 12 18:52:41 MDT 2000\n"
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| 136 |
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| 137 | #include "libbb.h"
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| 138 | #if ENABLE_FEATURE_DATE_NANO
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| 139 | # include <sys/syscall.h>
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| 140 | #endif
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| 141 |
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| 142 | enum {
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| 143 | OPT_RFC2822 = (1 << 0), /* R */
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| 144 | OPT_SET = (1 << 1), /* s */
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| 145 | OPT_UTC = (1 << 2), /* u */
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| 146 | OPT_DATE = (1 << 3), /* d */
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| 147 | OPT_REFERENCE = (1 << 4), /* r */
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| 148 | OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */
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| 149 | OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */
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| 150 | };
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| 151 |
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| 152 | static void maybe_set_utc(int opt)
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| 153 | {
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| 154 | if (opt & OPT_UTC)
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| 155 | putenv((char*)"TZ=UTC0");
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| 156 | }
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| 157 |
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| 158 | #if ENABLE_LONG_OPTS
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| 159 | static const char date_longopts[] ALIGN1 =
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| 160 | "rfc-822\0" No_argument "R"
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| 161 | "rfc-2822\0" No_argument "R"
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| 162 | "set\0" Required_argument "s"
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| 163 | "utc\0" No_argument "u"
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| 164 | /* "universal\0" No_argument "u" */
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| 165 | "date\0" Required_argument "d"
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| 166 | "reference\0" Required_argument "r"
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| 167 | ;
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| 168 | #endif
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| 169 |
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| 170 | int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 171 | int date_main(int argc UNUSED_PARAM, char **argv)
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| 172 | {
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| 173 | struct timespec ts;
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| 174 | struct tm tm_time;
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| 175 | char buf_fmt_dt2str[64];
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| 176 | unsigned opt;
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| 177 | int ifmt = -1;
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| 178 | char *date_str;
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| 179 | char *fmt_dt2str;
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| 180 | char *fmt_str2dt;
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| 181 | char *filename;
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| 182 | char *isofmt_arg = NULL;
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| 183 |
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| 184 | opt_complementary = "d--s:s--d"
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| 185 | IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
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| 186 | IF_LONG_OPTS(applet_long_options = date_longopts;)
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| 187 | opt = getopt32(argv, "Rs:ud:r:"
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| 188 | IF_FEATURE_DATE_ISOFMT("I::D:"),
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| 189 | &date_str, &date_str, &filename
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| 190 | IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
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| 191 | argv += optind;
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| 192 | maybe_set_utc(opt);
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| 193 |
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| 194 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) {
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| 195 | ifmt = 0; /* default is date */
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| 196 | if (isofmt_arg) {
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| 197 | static const char isoformats[] ALIGN1 =
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| 198 | "date\0""hours\0""minutes\0""seconds\0"; /* ns? */
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| 199 | ifmt = index_in_substrings(isoformats, isofmt_arg);
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| 200 | if (ifmt < 0)
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| 201 | bb_show_usage();
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| 202 | }
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| 203 | }
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| 204 |
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| 205 | fmt_dt2str = NULL;
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| 206 | if (argv[0] && argv[0][0] == '+') {
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| 207 | fmt_dt2str = &argv[0][1]; /* skip over the '+' */
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| 208 | argv++;
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| 209 | }
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| 210 | if (!(opt & (OPT_SET | OPT_DATE))) {
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| 211 | opt |= OPT_SET;
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| 212 | date_str = argv[0]; /* can be NULL */
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| 213 | if (date_str) {
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| 214 | #if ENABLE_FEATURE_DATE_COMPAT
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| 215 | int len = strspn(date_str, "0123456789");
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| 216 | if (date_str[len] == '\0'
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| 217 | || (date_str[len] == '.'
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| 218 | && isdigit(date_str[len+1])
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| 219 | && isdigit(date_str[len+2])
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| 220 | && date_str[len+3] == '\0'
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| 221 | )
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| 222 | ) {
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| 223 | /* Dreaded MMDDhhmm[[CC]YY][.ss] format!
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| 224 | * It does not match -d or -s format.
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| 225 | * Some users actually do use it.
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| 226 | */
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| 227 | len -= 8;
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| 228 | if (len < 0 || len > 4 || (len & 1))
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| 229 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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| 230 | if (len != 0) { /* move YY or CCYY to front */
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| 231 | char buf[4];
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| 232 | memcpy(buf, date_str + 8, len);
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| 233 | memmove(date_str + len, date_str, 8);
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| 234 | memcpy(date_str, buf, len);
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| 235 | }
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| 236 | }
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| 237 | #endif
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| 238 | argv++;
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| 239 | }
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| 240 | }
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| 241 | if (*argv)
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| 242 | bb_show_usage();
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| 243 |
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| 244 | /* Now we have parsed all the information except the date format
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| 245 | * which depends on whether the clock is being set or read */
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| 246 |
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| 247 | if (opt & OPT_REFERENCE) {
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| 248 | struct stat statbuf;
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| 249 | xstat(filename, &statbuf);
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| 250 | ts.tv_sec = statbuf.st_mtime;
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| 251 | #if ENABLE_FEATURE_DATE_NANO
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| 252 | ts.tv_nsec = statbuf.st_mtim.tv_nsec;
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| 253 | /* some toolchains use .st_mtimensec instead of st_mtim.tv_nsec */
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| 254 | #endif
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| 255 | } else {
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| 256 | #if ENABLE_FEATURE_DATE_NANO
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| 257 | /* libc has incredibly messy way of doing this,
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| 258 | * typically requiring -lrt. We just skip all this mess */
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| 259 | syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts);
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| 260 | #else
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| 261 | time(&ts.tv_sec);
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| 262 | #endif
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| 263 | }
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| 264 | localtime_r(&ts.tv_sec, &tm_time);
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| 265 |
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| 266 | /* If date string is given, update tm_time, and maybe set date */
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| 267 | if (date_str != NULL) {
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| 268 | /* Zero out fields - take her back to midnight! */
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| 269 | tm_time.tm_sec = 0;
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| 270 | tm_time.tm_min = 0;
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| 271 | tm_time.tm_hour = 0;
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| 272 |
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| 273 | /* Process any date input to UNIX time since 1 Jan 1970 */
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| 274 | if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) {
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| 275 | if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
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| 276 | bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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| 277 | } else {
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| 278 | parse_datestr(date_str, &tm_time);
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| 279 | }
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| 280 |
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| 281 | /* Correct any day of week and day of year etc. fields */
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| 282 | tm_time.tm_isdst = -1; /* Be sure to recheck dst */
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| 283 | ts.tv_sec = validate_tm_time(date_str, &tm_time);
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| 284 |
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| 285 | maybe_set_utc(opt);
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| 286 |
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| 287 | /* if setting time, set it */
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| 288 | if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
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| 289 | bb_perror_msg("can't set date");
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| 290 | }
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| 291 | }
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| 292 |
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| 293 | /* Display output */
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| 294 |
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| 295 | /* Deal with format string */
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| 296 | if (fmt_dt2str == NULL) {
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| 297 | int i;
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| 298 | fmt_dt2str = buf_fmt_dt2str;
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| 299 | if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
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| 300 | /* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */
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| 301 | strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S");
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| 302 | i = 8 + 3 * ifmt;
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| 303 | if (ifmt != 0) {
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| 304 | /* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */
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| 305 | format_utc:
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| 306 | fmt_dt2str[i++] = '%';
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| 307 | fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z';
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| 308 | }
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| 309 | fmt_dt2str[i] = '\0';
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| 310 | } else if (opt & OPT_RFC2822) {
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| 311 | /* -R. undo busybox.c setlocale */
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| 312 | if (ENABLE_LOCALE_SUPPORT)
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| 313 | setlocale(LC_TIME, "C");
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| 314 | strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
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| 315 | i = sizeof("%a, %d %b %Y %H:%M:%S ")-1;
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| 316 | goto format_utc;
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| 317 | } else { /* default case */
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| 318 | fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
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| 319 | }
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| 320 | }
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| 321 | #if ENABLE_FEATURE_DATE_NANO
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| 322 | else {
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| 323 | /* User-specified fmt_dt2str */
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| 324 | /* Search for and process "%N" */
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| 325 | char *p = fmt_dt2str;
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| 326 | while ((p = strchr(p, '%')) != NULL) {
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| 327 | int n, m;
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| 328 | unsigned pres, scale;
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| 329 |
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| 330 | p++;
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| 331 | if (*p == '%') {
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| 332 | p++;
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| 333 | continue;
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| 334 | }
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| 335 | n = strspn(p, "0123456789");
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| 336 | if (p[n] != 'N') {
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| 337 | p += n;
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| 338 | continue;
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| 339 | }
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| 340 | /* We have "%[nnn]N" */
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| 341 | p[-1] = '\0';
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| 342 | p[n] = '\0';
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| 343 | scale = 1;
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| 344 | pres = 9;
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| 345 | if (n) {
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| 346 | pres = xatoi_positive(p);
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| 347 | if (pres == 0)
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| 348 | pres = 9;
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| 349 | m = 9 - pres;
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| 350 | while (--m >= 0)
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| 351 | scale *= 10;
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| 352 | }
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| 353 |
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| 354 | m = p - fmt_dt2str;
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| 355 | p += n + 1;
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| 356 | fmt_dt2str = xasprintf("%s%0*u%s", fmt_dt2str, pres, (unsigned)ts.tv_nsec / scale, p);
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| 357 | p = fmt_dt2str + m;
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| 358 | }
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| 359 | }
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| 360 | #endif
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| 361 |
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| 362 | #define date_buf bb_common_bufsiz1
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| 363 | if (*fmt_dt2str == '\0') {
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| 364 | /* With no format string, just print a blank line */
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| 365 | date_buf[0] = '\0';
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| 366 | } else {
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| 367 | /* Handle special conversions */
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| 368 | if (strncmp(fmt_dt2str, "%f", 2) == 0) {
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| 369 | fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
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| 370 | }
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| 371 | /* Generate output string */
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| 372 | strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);
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| 373 | }
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| 374 | puts(date_buf);
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| 375 |
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| 376 | return EXIT_SUCCESS;
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| 377 | }
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