330 lines
9.1 KiB
C
330 lines
9.1 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 Reutner-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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/* 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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/* GNU coreutils 6.9 man page:
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* date [OPTION]... [+FORMAT]
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* date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
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* -d, --date=STRING
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* display time described by STRING, not `now'
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* -f, --file=DATEFILE
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* like --date once for each line of DATEFILE
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* -r, --reference=FILE
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* display the last modification time of FILE
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* -R, --rfc-2822
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* output date and time in RFC 2822 format.
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* Example: Mon, 07 Aug 2006 12:34:56 -0600
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* --rfc-3339=TIMESPEC
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* output date and time in RFC 3339 format.
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* TIMESPEC='date', 'seconds', or 'ns'
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* Date and time components are separated by a single space:
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* 2006-08-07 12:34:56-06:00
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* -s, --set=STRING
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* set time described by STRING
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* -u, --utc, --universal
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* print or set Coordinated Universal Time
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*
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* Busybox:
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* long options are not supported
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* -f is not supported
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* -I seems to roughly match --rfc-3339, but -I has _optional_ param
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* (thus "-I seconds" doesn't work, only "-Iseconds"),
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* and does not support -Ins
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* -D FMT is a bbox extension for _input_ conversion of -d DATE
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*/
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//kbuild:lib-$(CONFIG_DATE) += date.o
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//config:config DATE
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//config: bool "date"
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//config: default y
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//config: help
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//config: date is used to set the system date or display the
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//config: current time in the given format.
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//config:
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//config:config FEATURE_DATE_ISOFMT
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//config: bool "Enable ISO date format output (-I)"
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//config: default y
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//config: depends on DATE
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//config: help
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//config: Enable option (-I) to output an ISO-8601 compliant
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//config: date/time string.
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//config:
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//config:config FEATURE_DATE_NANO
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//config: bool "Support %[num]N nanosecond format specifier"
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//config: default n
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//config: depends on DATE
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//config: help
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//config: Support %[num]N format specifier. Adds ~250 bytes of code.
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//config:
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//config:config FEATURE_DATE_COMPAT
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//config: bool "Support weird 'date MMDDhhmm[[YY]YY][.ss]' format"
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//config: default y
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//config: depends on DATE
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//config: help
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//config: System time can be set by 'date -s DATE' and simply 'date DATE',
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//config: but formats of DATE string are different. 'date DATE' accepts
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//config: a rather weird MMDDhhmm[[YY]YY][.ss] format with completely
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//config: unnatural placement of year between minutes and seconds.
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//config: date -s (and other commands like touch -d) use more sensible
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//config: formats (for one, ISO format YYYY-MM-DD hh:mm:ss.ssssss).
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//config:
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//config: With this option off, 'date DATE' is 'date -s DATE' support
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//config: the same format. With it on, 'date DATE' additionally supports
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//config: MMDDhhmm[[YY]YY][.ss] format.
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#include "libbb.h"
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enum {
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OPT_RFC2822 = (1 << 0), /* R */
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OPT_SET = (1 << 1), /* s */
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OPT_UTC = (1 << 2), /* u */
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OPT_DATE = (1 << 3), /* d */
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OPT_REFERENCE = (1 << 4), /* r */
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OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */
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OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */
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};
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static void maybe_set_utc(int opt)
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{
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if (opt & OPT_UTC)
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putenv((char*)"TZ=UTC0");
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}
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#if ENABLE_LONG_OPTS
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static const char date_longopts[] ALIGN1 =
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"rfc-822\0" No_argument "R"
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"rfc-2822\0" No_argument "R"
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"set\0" Required_argument "s"
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"utc\0" No_argument "u"
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/* "universal\0" No_argument "u" */
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"date\0" Required_argument "d"
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"reference\0" Required_argument "r"
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;
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#endif
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int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int date_main(int argc UNUSED_PARAM, char **argv)
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{
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struct timespec ts;
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struct tm tm_time;
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char buf_fmt_dt2str[64];
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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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IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
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IF_LONG_OPTS(applet_long_options = date_longopts;)
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opt = getopt32(argv, "Rs:ud:r:"
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IF_FEATURE_DATE_ISOFMT("I::D:"),
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&date_str, &date_str, &filename
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IF_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 & 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"; /* ns? */
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ifmt = index_in_substrings(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 & (OPT_SET | OPT_DATE))) {
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opt |= OPT_SET;
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date_str = argv[0]; /* can be NULL */
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if (date_str) {
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#if ENABLE_FEATURE_DATE_COMPAT
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int len = strspn(date_str, "0123456789");
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if (date_str[len] == '\0'
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|| (date_str[len] == '.'
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&& isdigit(date_str[len+1])
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&& isdigit(date_str[len+2])
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&& date_str[len+3] == '\0'
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)
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) {
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/* Dreaded MMDDhhmm[[CC]YY][.ss] format!
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* It does not match -d or -s format.
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* Some users actually do use it.
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*/
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len -= 8;
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if (len < 0 || len > 4 || (len & 1))
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bb_error_msg_and_die(bb_msg_invalid_date, date_str);
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if (len != 0) { /* move YY or CCYY to front */
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char buf[4];
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memcpy(buf, date_str + 8, len);
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memmove(date_str + len, date_str, 8);
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memcpy(date_str, buf, len);
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}
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}
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#endif
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argv++;
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}
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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 & OPT_REFERENCE) {
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struct stat statbuf;
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xstat(filename, &statbuf);
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ts.tv_sec = statbuf.st_mtime;
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#if ENABLE_FEATURE_DATE_NANO
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ts.tv_nsec = statbuf.st_mtim.tv_nsec;
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#endif
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} else {
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#if ENABLE_FEATURE_DATE_NANO
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clock_gettime(CLOCK_REALTIME, &ts);
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#else
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time(&ts.tv_nsec);
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#endif
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}
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localtime_r(&ts.tv_sec, &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 & 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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parse_datestr(date_str, &tm_time);
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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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ts.tv_sec = validate_tm_time(date_str, &tm_time);
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maybe_set_utc(opt);
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/* if setting time, set it */
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if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
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bb_perror_msg("can't 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 = buf_fmt_dt2str;
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if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
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/* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */
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strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S");
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i = 8 + 3 * ifmt;
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if (ifmt != 0) {
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/* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */
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format_utc:
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fmt_dt2str[i++] = '%';
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fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z';
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}
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fmt_dt2str[i] = '\0';
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} else if (opt & OPT_RFC2822) {
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/* -R. undo busybox.c setlocale */
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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 = sizeof("%a, %d %b %Y %H:%M:%S ")-1;
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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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}
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#if ENABLE_FEATURE_DATE_NANO
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else {
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/* User-specified fmt_dt2str */
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/* Search for and process "%N" */
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char *p = fmt_dt2str;
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while ((p = strchr(p, '%')) != NULL) {
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int n, m;
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unsigned pres, scale;
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p++;
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if (*p == '%') {
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p++;
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continue;
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}
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n = strspn(p, "0123456789");
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if (p[n] != 'N') {
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p += n;
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continue;
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}
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/* We have "%[nnn]N" */
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p[-1] = '\0';
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p[n] = '\0';
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scale = 1;
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pres = 9;
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if (n) {
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pres = xatoi_u(p);
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if (pres == 0)
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pres = 9;
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m = 9 - pres;
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while (--m >= 0)
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scale *= 10;
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}
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m = p - fmt_dt2str;
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p += n + 1;
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fmt_dt2str = xasprintf("%s%0*u%s", fmt_dt2str, pres, (unsigned)ts.tv_nsec / scale, p);
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p = fmt_dt2str + m;
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}
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}
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#endif
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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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