busybox/coreutils/date.c
Denys Vlasenko 8dff01d06a libbb: introduce and use is_prefixed_with()
function                                             old     new   delta
is_prefixed_with                                       -      18     +18
complete_username                                     78      77      -1
man_main                                             737     735      -2
fsck_device                                          429     427      -2
unpack_ar_archive                                     80      76      -4
strip_unsafe_prefix                                  105     101      -4
singlemount                                         1054    1050      -4
rtc_adjtime_is_utc                                    90      86      -4
resolve_mount_spec                                    88      84      -4
parse_one_line                                      1029    1025      -4
parse_conf                                          1460    1456      -4
may_wakeup                                            83      79      -4
loadkmap_main                                        219     215      -4
get_irqs_from_stat                                   103      99      -4
get_header_cpio                                      913     909      -4
findfs_main                                           79      75      -4
fbsplash_main                                       1230    1226      -4
load_crontab                                         776     771      -5
expand_vars_to_list                                 1151    1146      -5
date_main                                            881     876      -5
skip_dev_pfx                                          30      24      -6
make_device                                         2199    2193      -6
complete_cmd_dir_file                                773     767      -6
run_applet_and_exit                                  715     708      -7
uudecode_main                                        321     313      -8
pwdx_main                                            197     189      -8
execute                                              568     560      -8
i2cdetect_main                                      1186    1176     -10
procps_scan                                         1242    1230     -12
procps_read_smaps                                   1017    1005     -12
process_module                                       746     734     -12
patch_main                                          1903    1891     -12
nfsmount                                            3572    3560     -12
stack_machine                                        126     112     -14
process_timer_stats                                  449     435     -14
match_fstype                                         111      97     -14
do_ipaddr                                           1344    1330     -14
open_list_and_close                                  359     343     -16
get_header_tar                                      1795    1779     -16
prepend_new_eth_table                                340     323     -17
fsck_main                                           1811    1794     -17
find_iface_state                                      56      38     -18
dnsd_main                                           1321    1303     -18
base_device                                          179     158     -21
find_keyword                                         104      82     -22
handle_incoming_and_exit                            2785    2762     -23
parse_and_put_prompt                                 774     746     -28
modinfo                                              347     317     -30
find_action                                          204     171     -33
update_passwd                                       1470    1436     -34
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540)         Total: -522 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-03-12 17:48:34 +01:00

386 lines
11 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini date implementation for busybox
*
* by Matthew Grant <grantma@anathoth.gen.nz>
*
* iso-format handling added by Robert Griebl <griebl@gmx.de>
* bugfixes and cleanup by Bernhard Reutner-Fischer
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
/* This 'date' command supports only 2 time setting formats,
all the GNU strftime stuff (its in libc, lets use it),
setting time using UTC and displaying it, as well as
an RFC 2822 compliant date output for shell scripting
mail commands */
/* Input parsing code is always bulky - used heavy duty libc stuff as
much as possible, missed out a lot of bounds checking */
//applet:IF_DATE(APPLET(date, BB_DIR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_DATE) += date.o
//config:config DATE
//config: bool "date"
//config: default y
//config: help
//config: date is used to set the system date or display the
//config: current time in the given format.
//config:
//config:config FEATURE_DATE_ISOFMT
//config: bool "Enable ISO date format output (-I)"
//config: default y
//config: depends on DATE
//config: help
//config: Enable option (-I) to output an ISO-8601 compliant
//config: date/time string.
//config:
//config:# defaults to "no": stat's nanosecond field is a bit non-portable
//config:config FEATURE_DATE_NANO
//config: bool "Support %[num]N nanosecond format specifier"
//config: default n
//config: depends on DATE # syscall(__NR_clock_gettime)
//config: select PLATFORM_LINUX
//config: help
//config: Support %[num]N format specifier. Adds ~250 bytes of code.
//config:
//config:config FEATURE_DATE_COMPAT
//config: bool "Support weird 'date MMDDhhmm[[YY]YY][.ss]' format"
//config: default y
//config: depends on DATE
//config: help
//config: System time can be set by 'date -s DATE' and simply 'date DATE',
//config: but formats of DATE string are different. 'date DATE' accepts
//config: a rather weird MMDDhhmm[[YY]YY][.ss] format with completely
//config: unnatural placement of year between minutes and seconds.
//config: date -s (and other commands like touch -d) use more sensible
//config: formats (for one, ISO format YYYY-MM-DD hh:mm:ss.ssssss).
//config:
//config: With this option off, 'date DATE' is 'date -s DATE' support
//config: the same format. With it on, 'date DATE' additionally supports
//config: MMDDhhmm[[YY]YY][.ss] format.
/* GNU coreutils 6.9 man page:
* date [OPTION]... [+FORMAT]
* date [-u|--utc|--universal] [MMDDhhmm[[CC]YY][.ss]]
* -d, --date=STRING
* display time described by STRING, not `now'
* -f, --file=DATEFILE
* like --date once for each line of DATEFILE
* -r, --reference=FILE
* display the last modification time of FILE
* -R, --rfc-2822
* output date and time in RFC 2822 format.
* Example: Mon, 07 Aug 2006 12:34:56 -0600
* --rfc-3339=TIMESPEC
* output date and time in RFC 3339 format.
* TIMESPEC='date', 'seconds', or 'ns'
* Date and time components are separated by a single space:
* 2006-08-07 12:34:56-06:00
* -s, --set=STRING
* set time described by STRING
* -u, --utc, --universal
* print or set Coordinated Universal Time
*
* Busybox:
* long options are not supported
* -f is not supported
* -I seems to roughly match --rfc-3339, but -I has _optional_ param
* (thus "-I seconds" doesn't work, only "-Iseconds"),
* and does not support -Ins
* -D FMT is a bbox extension for _input_ conversion of -d DATE
*/
//usage:#define date_trivial_usage
//usage: "[OPTIONS] [+FMT] [TIME]"
//usage:#define date_full_usage "\n\n"
//usage: "Display time (using +FMT), or set time\n"
//usage: IF_NOT_LONG_OPTS(
//usage: "\n [-s] TIME Set time to TIME"
//usage: "\n -u Work in UTC (don't convert to local time)"
//usage: "\n -R Output RFC-2822 compliant date string"
//usage: ) IF_LONG_OPTS(
//usage: "\n [-s,--set] TIME Set time to TIME"
//usage: "\n -u,--utc Work in UTC (don't convert to local time)"
//usage: "\n -R,--rfc-2822 Output RFC-2822 compliant date string"
//usage: )
//usage: IF_FEATURE_DATE_ISOFMT(
//usage: "\n -I[SPEC] Output ISO-8601 compliant date string"
//usage: "\n SPEC='date' (default) for date only,"
//usage: "\n 'hours', 'minutes', or 'seconds' for date and"
//usage: "\n time to the indicated precision"
//usage: )
//usage: IF_NOT_LONG_OPTS(
//usage: "\n -r FILE Display last modification time of FILE"
//usage: "\n -d TIME Display TIME, not 'now'"
//usage: ) IF_LONG_OPTS(
//usage: "\n -r,--reference FILE Display last modification time of FILE"
//usage: "\n -d,--date TIME Display TIME, not 'now'"
//usage: )
//usage: IF_FEATURE_DATE_ISOFMT(
//usage: "\n -D FMT Use FMT for -d TIME conversion"
//usage: )
//usage: "\n"
//usage: "\nRecognized TIME formats:"
//usage: "\n hh:mm[:ss]"
//usage: "\n [YYYY.]MM.DD-hh:mm[:ss]"
//usage: "\n YYYY-MM-DD hh:mm[:ss]"
//usage: "\n [[[[[YY]YY]MM]DD]hh]mm[.ss]"
//usage: IF_FEATURE_DATE_COMPAT(
//usage: "\n 'date TIME' form accepts MMDDhhmm[[YY]YY][.ss] instead"
//usage: )
//usage:
//usage:#define date_example_usage
//usage: "$ date\n"
//usage: "Wed Apr 12 18:52:41 MDT 2000\n"
#include "libbb.h"
#if ENABLE_FEATURE_DATE_NANO
# include <sys/syscall.h>
#endif
enum {
OPT_RFC2822 = (1 << 0), /* R */
OPT_SET = (1 << 1), /* s */
OPT_UTC = (1 << 2), /* u */
OPT_DATE = (1 << 3), /* d */
OPT_REFERENCE = (1 << 4), /* r */
OPT_TIMESPEC = (1 << 5) * ENABLE_FEATURE_DATE_ISOFMT, /* I */
OPT_HINT = (1 << 6) * ENABLE_FEATURE_DATE_ISOFMT, /* D */
};
static void maybe_set_utc(int opt)
{
if (opt & OPT_UTC)
putenv((char*)"TZ=UTC0");
}
#if ENABLE_LONG_OPTS
static const char date_longopts[] ALIGN1 =
"rfc-822\0" No_argument "R"
"rfc-2822\0" No_argument "R"
"set\0" Required_argument "s"
"utc\0" No_argument "u"
/* "universal\0" No_argument "u" */
"date\0" Required_argument "d"
"reference\0" Required_argument "r"
;
#endif
int date_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int date_main(int argc UNUSED_PARAM, char **argv)
{
struct timespec ts;
struct tm tm_time;
char buf_fmt_dt2str[64];
unsigned opt;
int ifmt = -1;
char *date_str;
char *fmt_dt2str;
char *fmt_str2dt;
char *filename;
char *isofmt_arg = NULL;
opt_complementary = "d--s:s--d"
IF_FEATURE_DATE_ISOFMT(":R--I:I--R");
IF_LONG_OPTS(applet_long_options = date_longopts;)
opt = getopt32(argv, "Rs:ud:r:"
IF_FEATURE_DATE_ISOFMT("I::D:"),
&date_str, &date_str, &filename
IF_FEATURE_DATE_ISOFMT(, &isofmt_arg, &fmt_str2dt));
argv += optind;
maybe_set_utc(opt);
if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_TIMESPEC)) {
ifmt = 0; /* default is date */
if (isofmt_arg) {
static const char isoformats[] ALIGN1 =
"date\0""hours\0""minutes\0""seconds\0"; /* ns? */
ifmt = index_in_substrings(isoformats, isofmt_arg);
if (ifmt < 0)
bb_show_usage();
}
}
fmt_dt2str = NULL;
if (argv[0] && argv[0][0] == '+') {
fmt_dt2str = &argv[0][1]; /* skip over the '+' */
argv++;
}
if (!(opt & (OPT_SET | OPT_DATE))) {
opt |= OPT_SET;
date_str = argv[0]; /* can be NULL */
if (date_str) {
#if ENABLE_FEATURE_DATE_COMPAT
int len = strspn(date_str, "0123456789");
if (date_str[len] == '\0'
|| (date_str[len] == '.'
&& isdigit(date_str[len+1])
&& isdigit(date_str[len+2])
&& date_str[len+3] == '\0'
)
) {
/* Dreaded MMDDhhmm[[CC]YY][.ss] format!
* It does not match -d or -s format.
* Some users actually do use it.
*/
len -= 8;
if (len < 0 || len > 4 || (len & 1))
bb_error_msg_and_die(bb_msg_invalid_date, date_str);
if (len != 0) { /* move YY or CCYY to front */
char buf[4];
memcpy(buf, date_str + 8, len);
memmove(date_str + len, date_str, 8);
memcpy(date_str, buf, len);
}
}
#endif
argv++;
}
}
if (*argv)
bb_show_usage();
/* Now we have parsed all the information except the date format
* which depends on whether the clock is being set or read */
if (opt & OPT_REFERENCE) {
struct stat statbuf;
xstat(filename, &statbuf);
ts.tv_sec = statbuf.st_mtime;
#if ENABLE_FEATURE_DATE_NANO
ts.tv_nsec = statbuf.st_mtim.tv_nsec;
/* Some toolchains use .st_mtimensec instead of st_mtim.tv_nsec.
* If you need #define _SVID_SOURCE 1 to enable st_mtim.tv_nsec,
* drop a mail to project mailing list please
*/
#endif
} else {
#if ENABLE_FEATURE_DATE_NANO
/* libc has incredibly messy way of doing this,
* typically requiring -lrt. We just skip all this mess */
syscall(__NR_clock_gettime, CLOCK_REALTIME, &ts);
#else
time(&ts.tv_sec);
#endif
}
localtime_r(&ts.tv_sec, &tm_time);
/* If date string is given, update tm_time, and maybe set date */
if (date_str != NULL) {
/* Zero out fields - take her back to midnight! */
tm_time.tm_sec = 0;
tm_time.tm_min = 0;
tm_time.tm_hour = 0;
/* Process any date input to UNIX time since 1 Jan 1970 */
if (ENABLE_FEATURE_DATE_ISOFMT && (opt & OPT_HINT)) {
if (strptime(date_str, fmt_str2dt, &tm_time) == NULL)
bb_error_msg_and_die(bb_msg_invalid_date, date_str);
} else {
parse_datestr(date_str, &tm_time);
}
/* Correct any day of week and day of year etc. fields */
/* Be sure to recheck dst (but not if date is time_t format) */
if (date_str[0] != '@')
tm_time.tm_isdst = -1;
ts.tv_sec = validate_tm_time(date_str, &tm_time);
maybe_set_utc(opt);
/* if setting time, set it */
if ((opt & OPT_SET) && stime(&ts.tv_sec) < 0) {
bb_perror_msg("can't set date");
}
}
/* Display output */
/* Deal with format string */
if (fmt_dt2str == NULL) {
int i;
fmt_dt2str = buf_fmt_dt2str;
if (ENABLE_FEATURE_DATE_ISOFMT && ifmt >= 0) {
/* -I[SPEC]: 0:date 1:hours 2:minutes 3:seconds */
strcpy(fmt_dt2str, "%Y-%m-%dT%H:%M:%S");
i = 8 + 3 * ifmt;
if (ifmt != 0) {
/* TODO: if (ifmt==4) i += sprintf(&fmt_dt2str[i], ",%09u", nanoseconds); */
format_utc:
fmt_dt2str[i++] = '%';
fmt_dt2str[i++] = (opt & OPT_UTC) ? 'Z' : 'z';
}
fmt_dt2str[i] = '\0';
} else if (opt & OPT_RFC2822) {
/* -R. undo busybox.c setlocale */
if (ENABLE_LOCALE_SUPPORT)
setlocale(LC_TIME, "C");
strcpy(fmt_dt2str, "%a, %d %b %Y %H:%M:%S ");
i = sizeof("%a, %d %b %Y %H:%M:%S ")-1;
goto format_utc;
} else { /* default case */
fmt_dt2str = (char*)"%a %b %e %H:%M:%S %Z %Y";
}
}
#if ENABLE_FEATURE_DATE_NANO
else {
/* User-specified fmt_dt2str */
/* Search for and process "%N" */
char *p = fmt_dt2str;
while ((p = strchr(p, '%')) != NULL) {
int n, m;
unsigned pres, scale;
p++;
if (*p == '%') {
p++;
continue;
}
n = strspn(p, "0123456789");
if (p[n] != 'N') {
p += n;
continue;
}
/* We have "%[nnn]N" */
p[-1] = '\0';
p[n] = '\0';
scale = 1;
pres = 9;
if (n) {
pres = xatoi_positive(p);
if (pres == 0)
pres = 9;
m = 9 - pres;
while (--m >= 0)
scale *= 10;
}
m = p - fmt_dt2str;
p += n + 1;
fmt_dt2str = xasprintf("%s%0*u%s", fmt_dt2str, pres, (unsigned)ts.tv_nsec / scale, p);
p = fmt_dt2str + m;
}
}
#endif
#define date_buf bb_common_bufsiz1
if (*fmt_dt2str == '\0') {
/* With no format string, just print a blank line */
date_buf[0] = '\0';
} else {
/* Handle special conversions */
if (is_prefixed_with(fmt_dt2str, "%f")) {
fmt_dt2str = (char*)"%Y.%m.%d-%H:%M:%S";
}
/* Generate output string */
strftime(date_buf, sizeof(date_buf), fmt_dt2str, &tm_time);
}
puts(date_buf);
return EXIT_SUCCESS;
}