busybox/coreutils/date.c
Denys Vlasenko 036585a911 getopt32: remove applet_long_options
FEATURE_GETOPT_LONG made dependent on LONG_OPTS.

The folloving options are removed, now LONG_OPTS enables long options
for affected applets:
FEATURE_ENV_LONG_OPTIONS	FEATURE_EXPAND_LONG_OPTIONS
FEATURE_UNEXPAND_LONG_OPTIONS	FEATURE_MKDIR_LONG_OPTIONS
FEATURE_MV_LONG_OPTIONS		FEATURE_RMDIR_LONG_OPTIONS
FEATURE_ADDGROUP_LONG_OPTIONS	FEATURE_ADDUSER_LONG_OPTIONS
FEATURE_HWCLOCK_LONG_OPTIONS	FEATURE_NSENTER_LONG_OPTS
FEATURE_CHCON_LONG_OPTIONS	FEATURE_RUNCON_LONG_OPTIONS

They either had a small number of long options, or their long options are
essential.

Example: upstream addgroup and adduser have ONLY longopts,
we should probably go further and get rid
of non-standard short options.

To this end, make addgroup and adduser "select LONG_OPTS".
We had this breakage caused by us even in our own package!
	#if ENABLE_LONG_OPTS || !ENABLE_ADDGROUP
                /* We try to use --gid, not -g, because "standard" addgroup
                 * has no short option -g, it has only long --gid.
                 */
                argv[1] = (char*)"--gid";
	#else
                /* Breaks if system in fact does NOT use busybox addgroup */
                argv[1] = (char*)"-g";
	#endif

xargs: its lone longopt no longer depends on DESKTOP, only on LONG_OPTS.

hwclock TODO: get rid of incompatible -t, -l aliases to --systz, --localtime

Shorten help texts by omitting long option when short opt alternative exists.

Reduction of size comes from the fact that store of an immediate
(an address of longopts) to a fixed address (global variable)
is a longer insn than pushing that immediate or passing it in a register.
This effect is CPU-agnostic.

function                                             old     new   delta
getopt32                                            1350      22   -1328
vgetopt32                                              -    1318   +1318
getopt32long                                           -      24     +24
tftpd_main                                           562     567      +5
scan_recursive                                       376     380      +4
collect_cpu                                          545     546      +1
date_main                                           1096    1095      -1
hostname_main                                        262     259      -3
uname_main                                           259     255      -4
setpriv_main                                         362     358      -4
rmdir_main                                           191     187      -4
mv_main                                              562     558      -4
ipcalc_main                                          548     544      -4
ifenslave_main                                       641     637      -4
gzip_main                                            192     188      -4
gunzip_main                                           77      73      -4
fsfreeze_main                                         81      77      -4
flock_main                                           318     314      -4
deluser_main                                         337     333      -4
cp_main                                              374     370      -4
chown_main                                           175     171      -4
applet_long_options                                    4       -      -4
xargs_main                                           894     889      -5
wget_main                                           2540    2535      -5
udhcpc_main                                         2767    2762      -5
touch_main                                           436     431      -5
tar_main                                            1014    1009      -5
start_stop_daemon_main                              1033    1028      -5
sed_main                                             682     677      -5
script_main                                         1082    1077      -5
run_parts_main                                       330     325      -5
rtcwake_main                                         459     454      -5
od_main                                             2169    2164      -5
nl_main                                              201     196      -5
modprobe_main                                        773     768      -5
mkdir_main                                           160     155      -5
ls_main                                              568     563      -5
install_main                                         773     768      -5
hwclock_main                                         411     406      -5
getopt_main                                          622     617      -5
fstrim_main                                          256     251      -5
env_main                                             198     193      -5
dumpleases_main                                      635     630      -5
dpkg_main                                           3991    3986      -5
diff_main                                           1355    1350      -5
cryptpw_main                                         233     228      -5
cpio_main                                            593     588      -5
conspy_main                                         1135    1130      -5
chpasswd_main                                        313     308      -5
adduser_main                                         887     882      -5
addgroup_main                                        416     411      -5
ftpgetput_main                                       351     345      -6
get_terminal_width_height                            242     234      -8
expand_main                                          690     680     -10
static.expand_longopts                                18       -     -18
static.unexpand_longopts                              27       -     -27
mkdir_longopts                                        28       -     -28
env_longopts                                          30       -     -30
static.ifenslave_longopts                             34       -     -34
mv_longopts                                           46       -     -46
static.rmdir_longopts                                 48       -     -48
packed_usage                                       31739   31687     -52
------------------------------------------------------------------------------
(add/remove: 2/8 grow/shrink: 3/49 up/down: 1352/-1840)      Total: -488 bytes
   text	   data	    bss	    dec	    hex	filename
 915681	    485	   6880	 923046	  e15a6	busybox_old
 915428	    485	   6876	 922789	  e14a5	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-08 17:09:40 +02:00

394 lines
12 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 */
//config:config DATE
//config: bool "date (7.1 kb)"
//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.
//applet:IF_DATE(APPLET_NOEXEC(date, date, BB_DIR_BIN, BB_SUID_DROP, date))
/* bb_common_bufsiz1 usage here is safe wrt NOEXEC: not expecting it to be zeroed. */
//kbuild:lib-$(CONFIG_DATE) += date.o
/* 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"
#include "common_bufsiz.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 */
};
#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
/* We are a NOEXEC applet.
* Obstacles to NOFORK:
* - we change env
* - xasprintf result not freed
* - after xasprintf we use other xfuncs
*/
static void maybe_set_utc(int opt)
{
if (opt & OPT_UTC)
putenv((char*)"TZ=UTC0");
}
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");
opt = getopt32long(argv, "Rs:ud:r:"
IF_FEATURE_DATE_ISOFMT("I::D:"), date_longopts,
&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
setup_common_bufsiz();
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, COMMON_BUFSIZE, fmt_dt2str, &tm_time);
}
puts(date_buf);
return EXIT_SUCCESS;
}