| /* date.c - set/get the date |
| * |
| * Copyright 2012 Andre Renaud <andre@bluewatersys.com> |
| * |
| * See http://opengroup.org/onlinepubs/9699919799/utilities/date.html |
| |
| USE_DATE(NEWTOY(date, "r:u", TOYFLAG_BIN)) |
| |
| config DATE |
| bool "date" |
| default y |
| help |
| usage: date [-u] [-r file] [+format] | mmddhhmm[[cc]yy] |
| |
| Set/get the current date/time |
| */ |
| |
| #define FOR_date |
| #include "toys.h" |
| |
| GLOBALS( |
| char *file; |
| ) |
| |
| void date_main(void) |
| { |
| const char *format_string = "%a %b %e %H:%M:%S %Z %Y"; |
| time_t now = time(NULL); |
| struct tm tm; |
| |
| 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); |
| |
| // 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)) |
| perror_msg("bad format `%s'", format_string); |
| |
| puts(toybuf); |
| |
| // Set the date |
| } else { |
| struct timeval tv; |
| char *s = *toys.optargs; |
| int len = strlen(s); |
| |
| if (len < 8 || len > 12 || (len & 1)) error_msg("bad date `%s'", s); |
| |
| // Date format: mmddhhmm[[cc]yy] |
| memset(&tm, 0, sizeof(tm)); |
| len = sscanf(s, "%2u%2u%2u%2u", &tm.tm_mon, &tm.tm_mday, &tm.tm_hour, |
| &tm.tm_min); |
| tm.tm_mon--; |
| |
| // If year specified, overwrite one we fetched earlier |
| if (len > 8) { |
| sscanf(s, "%u", &tm.tm_year); |
| if (len == 12) tm.tm_year -= 1900; |
| /* 69-99 = 1969-1999, 0 - 68 = 2000-2068 */ |
| else if (tm.tm_year < 69) tm.tm_year += 100; |
| } |
| |
| if (toys.optflags & FLAG_u) { |
| // Get the UTC version of a struct tm |
| char *tz = CFG_TOYBOX_FREE ? getenv("TZ") : 0; |
| 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) error_msg("bad `%s'", toys.optargs[0]); |
| tv.tv_usec = 0; |
| if (!strftime(toybuf, sizeof(toybuf), format_string, &tm)) |
| perror_msg("bad format `%s'", format_string); |
| puts(toybuf); |
| if (settimeofday(&tv, NULL) < 0) perror_msg("cannot set date"); |
| } |
| } |