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/* vi: set sw=4 ts=4:
*
* date.c - set/get the date
*
* Copyright 2012 Andre Renaud <andre@bluewatersys.com>
*
* See http://pubs.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
*/
#include "toys.h"
DEFINE_GLOBALS(
char *file;
)
#define TT this.date
#define FLAG_u 1
#define FLAG_r 2
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");
}
}
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