1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
|
/* 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, "r:u", TOYFLAG_BIN))
config DATE
bool "date"
default y
help
usage: date [-u] [-r FILE] [+FORMAT] | mmddhhmm[[cc]yy[.ss]]
Set/get the current date/time.
Setting the date requires month, day, hour (0-23), and minute, each
two digits. It can optionally include year, century, and .seconds.
-u Use UTC timezone instead of current
-r Use date from FILE instead of current date
*/
#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)) goto bad_format;
puts(toybuf);
// Set the date
} else {
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 (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) 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");
}
return;
bad_date:
error_exit("bad date '%s'", *toys.optargs);
bad_format:
perror_msg("bad format '%s'", format_string);
}
|
