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-rw-r--r--toys/posix/date.c166
1 files changed, 108 insertions, 58 deletions
diff --git a/toys/posix/date.c b/toys/posix/date.c
index e1ba636d..f56c4804 100644
--- a/toys/posix/date.c
+++ b/toys/posix/date.c
@@ -7,21 +7,39 @@
* Note: setting a 2 year date is 50 years back/forward from today,
* not posix's hardwired magic dates.
-USE_DATE(NEWTOY(date, "r:u", TOYFLAG_BIN))
+USE_DATE(NEWTOY(date, "d:s:r:u", TOYFLAG_BIN))
config DATE
bool "date"
default y
help
- usage: date [-u] [-r FILE] [+FORMAT] | mmddhhmm[[cc]yy[.ss]]
+ usage: date [-u] [-r FILE] [-d DATE] [+DISPLAY_FORMAT] [-s SET_FORMAT] [SET]
- Set/get the current date/time.
+ Set/get the current date/time. With no SET shows the current date.
- Setting the date requires month, day, hour (0-23), and minute, each
- two digits. It can optionally include year, century, and .seconds.
+ 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.
- -u Use UTC timezone instead of current
- -r Use date from FILE instead of current date
+ -d Show DATE instead of current time (convert date format)
+ -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:
+
+ %% 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)
+
+ %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
@@ -29,72 +47,98 @@ config DATE
GLOBALS(
char *file;
+ char *setfmt;
+ char *showdate;
)
+// Handle default posix date format: mmddhhmm[[cc]yy]
+// returns 0 success, nonzero for error
+int parse_posixdate(char *str, struct tm *tm)
+{
+ int len;
+
+ len = 0;
+ 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;
+ str += len;
+ tm->tm_mon--;
+
+ // If year specified, overwrite one we fetched earlier
+ if (*str && *str != '.') {
+ unsigned year, r1 = tm->tm_year % 100, r2 = (tm->tm_year + 50) % 100,
+ century = tm->tm_year - r1;
+
+ len = 0;
+ sscanf(str, "%u%n", &year, &len);
+ if (len == 4) year -= 1900;
+ else if (len != 2) return 1;
+ str += len;
+
+ // 2 digit years, next 50 years are "future", last 50 years are "past".
+ // A "future" date in past is a century ahead.
+ // A non-future date in the future is a century behind.
+ if ((r1 < r2) ? (r1 < year && year < r2) : (year < r1 || year > r2)) {
+ if (year < r1) year += 100;
+ } else if (year > r1) year -= 100;
+ tm->tm_year = year + century;
+ }
+ if (*str == '.') {
+ len = 0;
+ sscanf(str, ".%u%n", &tm->tm_sec, &len);
+ str += len;
+ }
+
+ return *str;
+}
+
void date_main(void)
{
- const char *format_string = "%a %b %e %H:%M:%S %Z %Y";
+ char *setdate = *toys.optargs, *format_string = "%a %b %e %H:%M:%S %Z %Y",
+ *tz;
time_t now = time(NULL);
struct tm tm;
+ // We can't just pass a timezone to mktime because posix.
+ if (toys.optflags & FLAG_u) {
+ tz = CFG_TOYBOX_FREE ? getenv("TZ") : 0;
+ setenv("TZ", "UTC", 1);
+ tzset();
+ }
+
if (TT.file) {
struct stat st;
xstat(TT.file, &st);
now = st.st_mtim.tv_sec;
- }
- ((toys.optflags & FLAG_u) ? gmtime_r : localtime_r)(&now, &tm);
-
+ } else if (TT.showdate) {
+ setdate = TT.showdate;
+ if (TT.setfmt) {
+printf("TT.showdate=%s TT.setfmt=%s\n", TT.showdate, TT.setfmt);
+ 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 localtime_r(&now, &tm);
+
+ setdate = *toys.optargs;
+ // Fall through if no arguments
+ if (!setdate);
// Display the date?
- if (!toys.optargs[0] || toys.optargs[0][0] == '+') {
- if (toys.optargs[0]) format_string = toys.optargs[0]+1;
- if (!strftime(toybuf, sizeof(toybuf), format_string, &tm)) goto bad_format;
-
- puts(toybuf);
+ else if (*setdate == '+') {
+ format_string = toys.optargs[0]+1;
+ setdate = toys.optargs[1];
// Set the date
- } else {
+ } else if (setdate) {
struct timeval tv;
- char *s = *toys.optargs;
- int len;
- // Date format: mmddhhmm[[cc]yy]
- len = 0;
- sscanf(s, "%2u%2u%2u%2u%n", &tm.tm_mon, &tm.tm_mday, &tm.tm_hour,
- &tm.tm_min, &len);
- if (len != 8) goto bad_date;
- s += len;
- tm.tm_mon--;
-
- // If year specified, overwrite one we fetched earlier
- if (*s && *s != '.') {
- unsigned year, r1 = tm.tm_year % 100, r2 = (tm.tm_year + 50) % 100,
- century = tm.tm_year - r1;
-
- len = 0;
- sscanf(s, "%u%n", &year, &len);
- if (len == 4) year -= 1900;
- else if (len != 2) goto bad_date;
- s += len;
-
- // 2 digit years, next 50 years are "future", last 50 years are "past".
- // A "future" date in past is a century ahead.
- // A non-future date in the future is a century behind.
- if ((r1 < r2) ? (r1 < year && year < r2) : (year < r1 || year > r2)) {
- if (year < r1) year += 100;
- } else if (year > r1) year -= 100;
- tm.tm_year = year + century;
- }
- if (*s == '.') {
- len = 0;
- sscanf(s, ".%u%n", &tm.tm_sec, &len);
- s += len;
- }
- if (*s) goto bad_date;
+ if (parse_posixdate(setdate, &tm)) goto bad_date;
if (toys.optflags & FLAG_u) {
- // Get the UTC version of a struct tm
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 = mktime(&tm);
@@ -107,15 +151,21 @@ void date_main(void)
if (tv.tv_sec == (time_t)-1) goto bad_date;
tv.tv_usec = 0;
- if (!strftime(toybuf, sizeof(toybuf), format_string, &tm)) goto bad_format;
- puts(toybuf);
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();
+ }
+
+ if (!strftime(toybuf, sizeof(toybuf), format_string, &tm))
+ perror_exit("bad format '%s'", format_string);
+ puts(toybuf);
+
return;
bad_date:
- error_exit("bad date '%s'", *toys.optargs);
-bad_format:
- perror_msg("bad format '%s'", format_string);
+ error_exit("bad date '%s'", setdate);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 10:01:42 +0000