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
32 #include "dateparse.h"
34 #define TM_YEAR_BASE 1900
37 /* Prototypes for local functions. */
38 static int first_wday (int year, int mon, int wday);
39 static int check_mday (int year, int mon, int mday);
41 # define isleap(year) \
42 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
44 /* Set to one of the following values to indicate an error.
45 1 the DATEMSK environment variable is null or undefined,
46 2 the template file cannot be opened for reading,
47 3 failed to get file status information,
48 4 the template file is not a regular file,
49 5 an error is encountered while reading the template file,
50 6 memory allication failed (not enough memory available),
51 7 there is no line in the template that matches the input,
52 8 invalid input specification Example: February 31 or a time is
53 specified that can not be represented in a time_t (representing
54 the time in seconds since 00:00:00 UTC, January 1, 1970) */
58 /* Returns the first weekday WDAY of month MON in the year YEAR. */
60 first_wday (int year, int mon, int wday)
67 memset (&tm, 0, sizeof (struct tm));
73 return (1 + (wday - tm.tm_wday + 7) % 7);
77 /* Returns 1 if MDAY is a valid day of the month in month MON of year
78 YEAR, and 0 if it is not. */
80 check_mday (int year, int mon, int mday)
91 if (mday >= 1 && mday <= 31)
98 if (mday >= 1 && mday <= 30)
102 if (mday >= 1 && mday <= (isleap (year) ? 29 : 28))
112 xgetdate_r (const char *string, struct tm *tp,
113 const char *const *template)
124 while((line = *template++))
126 /* Do the conversion. */
127 tp->tm_year = tp->tm_mon = tp->tm_mday = tp->tm_wday = INT_MIN;
128 tp->tm_hour = tp->tm_sec = tp->tm_min = INT_MIN;
132 result = strptime (string, line, tp);
133 if (result && *result == '\0')
137 if (result == NULL || *result != '\0')
140 /* Get current time. */
142 localtime_r (&timer, &tm);
144 /* If only the weekday is given, today is assumed if the given day
145 is equal to the current day and next week if it is less. */
146 if (tp->tm_wday >= 0 && tp->tm_wday <= 6 && tp->tm_year == INT_MIN
147 && tp->tm_mon == INT_MIN && tp->tm_mday == INT_MIN)
149 tp->tm_year = tm.tm_year;
150 tp->tm_mon = tm.tm_mon;
151 tp->tm_mday = tm.tm_mday + (tp->tm_wday - tm.tm_wday + 7) % 7;
155 /* If only the month is given, the current month is assumed if the
156 given month is equal to the current month and next year if it is
157 less and no year is given (the first day of month is assumed if
159 if (tp->tm_mon >= 0 && tp->tm_mon <= 11 && tp->tm_mday == INT_MIN)
161 if (tp->tm_year == INT_MIN)
162 tp->tm_year = tm.tm_year + (((tp->tm_mon - tm.tm_mon) < 0) ? 1 : 0);
163 tp->tm_mday = first_wday (tp->tm_year, tp->tm_mon, tp->tm_wday);
167 /* If no hour, minute and second are given the current hour, minute
168 and second are assumed. */
169 if (tp->tm_hour == INT_MIN && tp->tm_min == INT_MIN && tp->tm_sec == INT_MIN)
171 tp->tm_hour = tm.tm_hour;
172 tp->tm_min = tm.tm_min;
173 tp->tm_sec = tm.tm_sec;
176 /* If no date is given, today is assumed if the given hour is
177 greater than the current hour and tomorrow is assumed if
179 if (tp->tm_hour >= 0 && tp->tm_hour <= 23
180 && tp->tm_year == INT_MIN && tp->tm_mon == INT_MIN
181 && tp->tm_mday == INT_MIN && tp->tm_wday == INT_MIN)
183 tp->tm_year = tm.tm_year;
184 tp->tm_mon = tm.tm_mon;
185 tp->tm_mday = tm.tm_mday + ((tp->tm_hour - tm.tm_hour) < 0 ? 1 : 0);
189 /* Fill in the gaps. */
190 if (tp->tm_year == INT_MIN)
191 tp->tm_year = tm.tm_year;
192 if (tp->tm_hour == INT_MIN)
194 if (tp->tm_min == INT_MIN)
196 if (tp->tm_sec == INT_MIN)
199 /* Check if the day of month is within range, and if the time can be
200 represented in a time_t. We make use of the fact that the mktime
201 call normalizes the struct tm. */
202 if ((!mday_ok && !check_mday (TM_YEAR_BASE + tp->tm_year, tp->tm_mon,
204 || mktime (tp) == (time_t) -1)
213 xgetdate (const char *string, const char *const *template)
215 /* Buffer returned by getdate. */
216 static struct tm tmbuf;
217 int errval = xgetdate_r (string, &tmbuf, template);
221 getdate_err = errval;