/* 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"); } }