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-rw-r--r--toys/posix/date.c115
1 files changed, 70 insertions, 45 deletions
diff --git a/toys/posix/date.c b/toys/posix/date.c
index 84e04fcc..5719fd25 100644
--- a/toys/posix/date.c
+++ b/toys/posix/date.c
@@ -7,22 +7,23 @@
* Note: setting a 2 year date is 50 years back/forward from today,
* not posix's hardwired magic dates.
-USE_DATE(NEWTOY(date, "d:s:r:u[!dr]", TOYFLAG_BIN))
+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] [-s SET_FORMAT] [SET]
+ 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.
Default SET format is "MMDDhhmm[[CC]YY][.ss]", that's (2 digits each)
month, day, hour (0-23), and minute. Optionally century, year, and second.
+ Also accepts "@UNIXTIME[.FRACTION]" as seconds since midnight Jan 1 1970.
-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
- -s +FORMAT for SET or -d (instead of MMDDhhmm[[CC]YY][.ss])
-u Use UTC instead of current timezone
+FORMAT specifies display format string using these escapes:
@@ -49,33 +50,73 @@ GLOBALS(
char *file;
char *setfmt;
char *showdate;
+
+ char *tz;
+ unsigned nano;
)
// mktime(3) normalizes the struct tm fields, but date(1) shouldn't.
-// If we round trip via localtime_r(3) and get back where we started,
-// we know 'tm' is already in normal form.
-static time_t non_normalizing_mktime(struct tm *tm)
+static time_t chkmktime(struct tm *tm)
{
- struct tm tm0 = *tm;
+ struct tm tm2;
time_t t = mktime(tm);
- struct tm tm1;
+ int *tt1 = (void *)tm, *tt2=(void *)&tm2, i;
+
+ if (t != -1 && localtime_r(&t, &tm2)) {
+ for (i=0; i<6; i++) if (tt1[i] != tt2[i]) break;
+ if (i == 5) return t;
+ }
- if (t == -1 || !localtime_r(&t, &tm1) ||
- tm0.tm_sec != tm1.tm_sec || tm0.tm_min != tm1.tm_min ||
- tm0.tm_hour != tm1.tm_hour || tm0.tm_mday != tm1.tm_mday ||
- tm0.tm_mon != tm1.tm_mon)
- return -1;
+ return -1;
+}
- return t;
+static void utzset(void)
+{
+ if (!(TT.tz = getenv("TZ"))) TT.tz = (char *)1;
+ setenv("TZ", "UTC", 1);
+ tzset();
+}
+
+static void utzreset(void)
+{
+ if (TT.tz) {
+ if (TT.tz != (char *)1) setenv("TZ", TT.tz, 1);
+ else unsetenv("TZ");
+ tzset();
+ }
}
-// Handle default posix date format: mmddhhmm[[cc]yy]
+// Handle default posix date format (mmddhhmm[[cc]yy]) or @UNIX[.FRAC]
// returns 0 success, nonzero for error
-static int parse_posixdate(char *str, struct tm *tm)
+static int parse_default(char *str, struct tm *tm)
{
- int len;
+ int len = 0;
+
+ // Parse @UNIXTIME[.FRACTION]
+ if (*str == '@') {
+ long long ll;
+ time_t tt;
+
+ // Collect seconds and nanoseconds
+ // Note: struct tm hasn't got a fractional seconds field, thus strptime()
+ // doesn't support it, so store nanoseconds out of band (in globals).
+ // tt and ll are separate because we can't guarantee time_t is 64 bit (yet).
+ sscanf(str, "@%lld%n", &ll, &len);
+ if (str[len]=='.') {
+ str += len+1;
+ for (len = 0; len<9; len++) {
+ TT.nano *= 10;
+ if (isdigit(str[len])) TT.nano += str[len]-'0';
+ }
+ }
+ if (str[len]) return 1;
+ tt = ll;
+ gmtime_r(&tt, tm);
+
+ return 0;
+ }
- len = 0;
+ // Posix format
sscanf(str, "%2u%2u%2u%2u%n", &tm->tm_mon, &tm->tm_mday, &tm->tm_hour,
&tm->tm_min, &len);
if (len != 8) return 1;
@@ -112,16 +153,11 @@ static int parse_posixdate(char *str, struct tm *tm)
void date_main(void)
{
- char *setdate = *toys.optargs, *format_string = "%a %b %e %H:%M:%S %Z %Y",
- *tz = 0;
+ char *setdate = *toys.optargs, *format_string = "%a %b %e %H:%M:%S %Z %Y";
struct tm tm;
// We can't just pass a timezone to mktime because posix.
- if (toys.optflags & FLAG_u) {
- if (CFG_TOYBOX_FREE) tz = getenv("TZ");
- setenv("TZ", "UTC", 1);
- tzset();
- }
+ if (toys.optflags & FLAG_u) utzset();
if (TT.showdate) {
setdate = TT.showdate;
@@ -129,7 +165,7 @@ void date_main(void)
char *s = strptime(TT.showdate, TT.setfmt+(*TT.setfmt=='+'), &tm);
if (!s || *s) goto bad_date;
- } else if (parse_posixdate(TT.showdate, &tm)) goto bad_date;
+ } else if (parse_default(TT.showdate, &tm)) goto bad_date;
} else {
time_t now;
@@ -155,33 +191,22 @@ void date_main(void)
} else if (setdate) {
struct timeval tv;
- if (parse_posixdate(setdate, &tm)) goto bad_date;
+ if (parse_default(setdate, &tm)) goto bad_date;
if (toys.optflags & FLAG_u) {
- char *tz = CFG_TOYBOX_FREE ? getenv("TZ") : 0;
-
// We can't just pass a timezone to mktime because posix.
- setenv("TZ", "UTC", 1);
- tzset();
- tv.tv_sec = non_normalizing_mktime(&tm);
- if (CFG_TOYBOX_FREE) {
- if (tz) setenv("TZ", tz, 1);
- else unsetenv("TZ");
- tzset();
- }
- } else tv.tv_sec = non_normalizing_mktime(&tm);
+ utzset();
+ tv.tv_sec = chkmktime(&tm);
+ utzreset();
+ } else tv.tv_sec = chkmktime(&tm);
if (tv.tv_sec == (time_t)-1) goto bad_date;
- tv.tv_usec = 0;
+ tv.tv_usec = TT.nano/1000;
+exit(1);
if (settimeofday(&tv, NULL) < 0) perror_msg("cannot set date");
}
- if (toys.optflags & FLAG_u) {
- if (tz) setenv("TZ", tz, 1);
- else unsetenv("TZ");
- tzset();
- }
-
+ utzreset();
if (!strftime(toybuf, sizeof(toybuf), format_string, &tm))
perror_exit("bad format '%s'", format_string);
puts(toybuf);