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/* date.c - set/get the date
*
* Copyright 2012 Andre Renaud <andre@bluewatersys.com>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/date.html
*
* Note: setting a 2 year date is 50 years back/forward from today,
* not posix's hardwired magic dates.
USE_DATE(NEWTOY(date, "d:D:r:u[!dr]", TOYFLAG_BIN))
config DATE
bool "date"
default y
help
usage: date [-u] [-r FILE] [-d DATE] [+DISPLAY_FORMAT] [-D SET_FORMAT] [SET]
Set/get the current date/time. With no SET shows the current date.
-d Show DATE instead of current time (convert date format)
-D +FORMAT for SET or -d (instead of MMDDhhmm[[CC]YY][.ss])
-r Use modification time of FILE instead of current date
-u Use UTC instead of current timezone
Supported input formats:
MMDDhhmm[[CC]YY][.ss] POSIX
@UNIXTIME[.FRACTION] seconds since midnight 1970-01-01
YYYY-MM-DD [hh:mm[:ss]] ISO 8601
hh:mm[:ss] 24-hour time today
All input formats can be preceded by TZ="id" to set the input time zone
separately from the output time zone. Otherwise $TZ sets both.
+FORMAT specifies display format string using strftime(3) syntax:
%% literal % %n newline %t tab
%S seconds (00-60) %M minute (00-59) %m month (01-12)
%H hour (0-23) %I hour (01-12) %p AM/PM
%y short year (00-99) %Y year %C century
%a short weekday name %A weekday name %u day of week (1-7, 1=mon)
%b short month name %B month name %Z timezone name
%j day of year (001-366) %d day of month (01-31) %e day of month ( 1-31)
%N nanosec (output only)
%U Week of year (0-53 start sunday) %W Week of year (0-53 start monday)
%V Week of year (1-53 start monday, week < 4 days not part of this year)
%D = "%m/%d/%y" %r = "%I : %M : %S %p" %T = "%H:%M:%S" %h = "%b"
%x locale date %X locale time %c locale date/time
*/
#define FOR_date
#include "toys.h"
GLOBALS(
char *r, *D, *d;
unsigned nano;
)
// Handles any leading `TZ="blah" ` in the input string.
static void parse_date(char *str, time_t *t)
{
char *new_tz = NULL, *old_tz, *s = str;
if (!strncmp(str, "TZ=\"", 4)) {
// Extract the time zone and skip any whitespace.
new_tz = str+4;
if (!(str = strchr(new_tz, '"'))) xvali_date(0, s);
*str++ = 0;
while (isspace(*str)) str++;
// Switch $TZ.
old_tz = getenv("TZ");
setenv("TZ", new_tz, 1);
tzset();
}
time(t);
xparsedate(str, t, &TT.nano, 1);
if (new_tz) {
if (old_tz) setenv("TZ", old_tz, 1);
else unsetenv("TZ");
}
}
// Print strftime plus %N escape(s). note: modifies fmt for %N
static void puts_time(char *fmt, struct tm *tm)
{
char *s, *snap;
long width = width;
for (s = fmt;;s++) {
// Find next %N or end
if (*(snap = s) == '%') {
width = isdigit(*++s) ? *(s++)-'0' : 9;
if (*s && *s != 'N') continue;
} else if (*s) continue;
// Don't modify input string if no %N (default format is constant string).
if (*s) *snap = 0;
if (!strftime(toybuf, sizeof(toybuf)-10, fmt, tm))
perror_exit("bad format '%s'", fmt);
if (*s) {
snap = toybuf+strlen(toybuf);
sprintf(snap, "%09u", TT.nano);
snap[width] = 0;
}
fputs(toybuf, stdout);
if (!*s || !*(fmt = s+1)) break;
}
xputc('\n');
}
void date_main(void)
{
char *setdate = *toys.optargs, *format_string = "%a %b %e %H:%M:%S %Z %Y",
*tz = NULL;
time_t t;
if (FLAG(u)) {
tz = getenv("TZ");
setenv("TZ", "UTC", 1);
tzset();
}
if (TT.d) {
if (TT.D) {
struct tm tm = {};
char *s = strptime(TT.d, TT.D+(*TT.D=='+'), &tm);
t = (s && *s) ? xvali_date(&tm, s) : xvali_date(0, TT.d);
} else parse_date(TT.d, &t);
} else {
struct timespec ts;
struct stat st;
if (TT.r) {
xstat(TT.r, &st);
ts = st.st_mtim;
} else clock_gettime(CLOCK_REALTIME, &ts);
t = ts.tv_sec;
TT.nano = ts.tv_nsec;
}
// Fall through if no arguments
if (!setdate);
// Display the date?
else if (*setdate == '+') {
format_string = toys.optargs[0]+1;
setdate = toys.optargs[1];
// Set the date
} else if (setdate) {
struct timeval tv;
parse_date(setdate, &t);
tv.tv_sec = t;
tv.tv_usec = TT.nano/1000;
if (settimeofday(&tv, NULL) < 0) perror_msg("cannot set date");
}
puts_time(format_string, localtime(&t));
if (FLAG(u)) {
if (tz) setenv("TZ", tz, 1);
else unsetenv("TZ");
tzset();
}
return;
}
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