/* 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:s:r:u", TOYFLAG_BIN)) config DATE bool "date" default y help usage: date [-u] [-r FILE] [-d DATE] [+DISPLAY_FORMAT] [-s 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. -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 #include "toys.h" 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) { char *setdate = *toys.optargs, *format_string = "%a %b %e %H:%M:%S %Z %Y", *tz = 0; time_t now = time(NULL); 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 (TT.file) { struct stat st; xstat(TT.file, &st); now = st.st_mtim.tv_sec; } else if (TT.showdate) { setdate = TT.showdate; if (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? else if (*setdate == '+') { format_string = toys.optargs[0]+1; setdate = toys.optargs[1]; // Set the date } else if (setdate) { struct timeval tv; if (parse_posixdate(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 = mktime(&tm); if (CFG_TOYBOX_FREE) { if (tz) setenv("TZ", tz, 1); else unsetenv("TZ"); tzset(); } } else tv.tv_sec = mktime(&tm); if (tv.tv_sec == (time_t)-1) goto bad_date; tv.tv_usec = 0; 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'", setdate); }