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
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/* 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:D:r:u[!dr]", TOYFLAG_BIN))
config DATE
bool "date"
default y
help
usage: date [-u] [-r FILE] [-d DATE] [+DISPLAY_FORMAT] [-D 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.
Also accepts "@UNIXTIME[.FRACTION]" as seconds since midnight Jan 1 1970.
-d Show DATE instead of current time (convert date format)
-D +FORMAT for SET or -d (instead of MMDDhhmm[[CC]YY][.ss])
-r Use modification time of FILE instead of current date
-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;
char *tz;
unsigned nano;
)
// mktime(3) normalizes the struct tm fields, but date(1) shouldn't.
static time_t chkmktime(struct tm *tm)
{
struct tm tm2;
time_t t = mktime(tm);
int *tt1 = (void *)tm, *tt2=(void *)&tm2, i;
if (t != -1 && localtime_r(&t, &tm2)) {
for (i=0; i<6; i++) if (tt1[i] != tt2[i]) break;
if (i == 5) return t;
}
return -1;
}
static void utzset(void)
{
if (!(TT.tz = getenv("TZ"))) TT.tz = (char *)1;
setenv("TZ", "UTC", 1);
tzset();
}
static void utzreset(void)
{
if (TT.tz) {
if (TT.tz != (char *)1) setenv("TZ", TT.tz, 1);
else unsetenv("TZ");
tzset();
}
}
// Handle default posix date format (mmddhhmm[[cc]yy]) or @UNIX[.FRAC]
// returns 0 success, nonzero for error
static int parse_default(char *str, struct tm *tm)
{
int len = 0;
// Parse @UNIXTIME[.FRACTION]
if (*str == '@') {
long long ll;
time_t tt;
// Collect seconds and nanoseconds
// Note: struct tm hasn't got a fractional seconds field, thus strptime()
// doesn't support it, so store nanoseconds out of band (in globals).
// tt and ll are separate because we can't guarantee time_t is 64 bit (yet).
sscanf(str, "@%lld%n", &ll, &len);
if (str[len]=='.') {
str += len+1;
for (len = 0; len<9; len++) {
TT.nano *= 10;
if (isdigit(str[len])) TT.nano += str[len]-'0';
}
}
if (str[len]) return 1;
tt = ll;
gmtime_r(&tt, tm);
return 0;
}
// Posix format
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";
struct tm tm;
// We can't just pass a timezone to mktime because posix.
if (toys.optflags & FLAG_u) utzset();
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_default(TT.showdate, &tm)) goto bad_date;
} else {
time_t now;
if (TT.file) {
struct stat st;
xstat(TT.file, &st);
now = st.st_mtim.tv_sec;
} else now = time(0);
((toys.optflags & FLAG_u) ? gmtime_r : 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_default(setdate, &tm)) goto bad_date;
if (toys.optflags & FLAG_u) {
// We can't just pass a timezone to mktime because posix.
utzset();
tv.tv_sec = chkmktime(&tm);
utzreset();
} else tv.tv_sec = chkmktime(&tm);
if (tv.tv_sec == (time_t)-1) goto bad_date;
tv.tv_usec = TT.nano/1000;
exit(1);
if (settimeofday(&tv, NULL) < 0) perror_msg("cannot set date");
}
utzreset();
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);
}
|
