1 /* Derived from getdate.c in glibc 2.3.6. This is pretty much
2 * standard getdate() except that you supply the template in an
3 * argument, rather than messing around with environment variables and
6 /* Convert a string representation of time to a time value.
7 Copyright (C) 1997,1998,1999,2000,2001,2003 Free Software Foundation, Inc.
8 This file is part of the GNU C Library.
9 Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
11 The GNU C Library is free software; you can redistribute it and/or
12 modify it under the terms of the GNU Lesser General Public
13 License as published by the Free Software Foundation; either
14 version 2.1 of the License, or (at your option) any later version.
16 The GNU C Library is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 Lesser General Public License for more details.
21 You should have received a copy of the GNU Lesser General Public
22 License along with the GNU C Library; if not, write to the Free
23 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26 #define _GNU_SOURCE 1 /* to expose strptime */
33 #include "dateparse.h"
35 #define TM_YEAR_BASE 1900
38 /* Prototypes for local functions. */
39 static int first_wday (int year
, int mon
, int wday
);
40 static int check_mday (int year
, int mon
, int mday
);
42 # define isleap(year) \
43 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
45 /* Set to one of the following values to indicate an error.
46 1 the DATEMSK environment variable is null or undefined,
47 2 the template file cannot be opened for reading,
48 3 failed to get file status information,
49 4 the template file is not a regular file,
50 5 an error is encountered while reading the template file,
51 6 memory allication failed (not enough memory available),
52 7 there is no line in the template that matches the input,
53 8 invalid input specification Example: February 31 or a time is
54 specified that can not be represented in a time_t (representing
55 the time in seconds since 00:00:00 UTC, January 1, 1970) */
59 /* Returns the first weekday WDAY of month MON in the year YEAR. */
61 first_wday (int year
, int mon
, int wday
)
68 memset (&tm
, 0, sizeof (struct tm
));
74 return (1 + (wday
- tm
.tm_wday
+ 7) % 7);
78 /* Returns 1 if MDAY is a valid day of the month in month MON of year
79 YEAR, and 0 if it is not. */
81 check_mday (int year
, int mon
, int mday
)
92 if (mday
>= 1 && mday
<= 31)
99 if (mday
>= 1 && mday
<= 30)
103 if (mday
>= 1 && mday
<= (isleap (year
) ?
29 : 28))
113 xgetdate_r (const char *string
, struct tm
*tp
,
114 const char *const *template)
125 while((line
= *template++))
127 /* Do the conversion. */
128 tp
->tm_year
= tp
->tm_mon
= tp
->tm_mday
= tp
->tm_wday
= INT_MIN
;
129 tp
->tm_hour
= tp
->tm_sec
= tp
->tm_min
= INT_MIN
;
133 result
= strptime (string
, line
, tp
);
134 if (result
&& *result
== '\0')
138 if (result
== NULL
|| *result
!= '\0')
141 /* Get current time. */
143 localtime_r (&timer
, &tm
);
145 /* If only the weekday is given, today is assumed if the given day
146 is equal to the current day and next week if it is less. */
147 if (tp
->tm_wday
>= 0 && tp
->tm_wday
<= 6 && tp
->tm_year
== INT_MIN
148 && tp
->tm_mon
== INT_MIN
&& tp
->tm_mday
== INT_MIN
)
150 tp
->tm_year
= tm
.tm_year
;
151 tp
->tm_mon
= tm
.tm_mon
;
152 tp
->tm_mday
= tm
.tm_mday
+ (tp
->tm_wday
- tm
.tm_wday
+ 7) % 7;
156 /* If only the month is given, the current month is assumed if the
157 given month is equal to the current month and next year if it is
158 less and no year is given (the first day of month is assumed if
160 if (tp
->tm_mon
>= 0 && tp
->tm_mon
<= 11 && tp
->tm_mday
== INT_MIN
)
162 if (tp
->tm_year
== INT_MIN
)
163 tp
->tm_year
= tm
.tm_year
+ (((tp
->tm_mon
- tm
.tm_mon
) < 0) ?
1 : 0);
164 tp
->tm_mday
= first_wday (tp
->tm_year
, tp
->tm_mon
, tp
->tm_wday
);
168 /* If no hour, minute and second are given the current hour, minute
169 and second are assumed. */
170 if (tp
->tm_hour
== INT_MIN
&& tp
->tm_min
== INT_MIN
&& tp
->tm_sec
== INT_MIN
)
172 tp
->tm_hour
= tm
.tm_hour
;
173 tp
->tm_min
= tm
.tm_min
;
174 tp
->tm_sec
= tm
.tm_sec
;
177 /* If no date is given, today is assumed if the given hour is
178 greater than the current hour and tomorrow is assumed if
180 if (tp
->tm_hour
>= 0 && tp
->tm_hour
<= 23
181 && tp
->tm_year
== INT_MIN
&& tp
->tm_mon
== INT_MIN
182 && tp
->tm_mday
== INT_MIN
&& tp
->tm_wday
== INT_MIN
)
184 tp
->tm_year
= tm
.tm_year
;
185 tp
->tm_mon
= tm
.tm_mon
;
186 tp
->tm_mday
= tm
.tm_mday
+ ((tp
->tm_hour
- tm
.tm_hour
) < 0 ?
1 : 0);
190 /* Fill in the gaps. */
191 if (tp
->tm_year
== INT_MIN
)
192 tp
->tm_year
= tm
.tm_year
;
193 if (tp
->tm_hour
== INT_MIN
)
195 if (tp
->tm_min
== INT_MIN
)
197 if (tp
->tm_sec
== INT_MIN
)
200 /* Check if the day of month is within range, and if the time can be
201 represented in a time_t. We make use of the fact that the mktime
202 call normalizes the struct tm. */
203 if ((!mday_ok
&& !check_mday (TM_YEAR_BASE
+ tp
->tm_year
, tp
->tm_mon
,
205 || mktime (tp
) == (time_t) -1)
214 xgetdate (const char *string
, const char *const *template)
216 /* Buffer returned by getdate. */
217 static struct tm tmbuf
;
218 int errval
= xgetdate_r (string
, &tmbuf
, template);
222 xgetdate_err
= errval
;