1 /** @file lib/xgetdate.c
4 * Derived from getdate.c in glibc 2.3.6. This is pretty much
5 * standard getdate() except that you supply the template in an
6 * argument, rather than messing around with environment variables and
10 /* Convert a string representation of time to a time value.
11 Copyright (C) 1997,1998,1999,2000,2001,2003 Free Software Foundation, Inc.
12 This file is part of the GNU C Library.
13 Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
15 The GNU C Library is free software; you can redistribute it and/or
16 modify it under the terms of the GNU Lesser General Public
17 License as published by the Free Software Foundation; either
18 version 2.1 of the License, or (at your option) any later version.
20 The GNU C Library is distributed in the hope that it will be useful,
21 but WITHOUT ANY WARRANTY; without even the implied warranty of
22 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23 Lesser General Public License for more details.
25 You should have received a copy of the GNU Lesser General Public
26 License along with the GNU C Library; if not, write to the Free
27 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
30 #define _GNU_SOURCE 1 /* to expose strptime */
37 #include "dateparse.h"
39 #define TM_YEAR_BASE 1900
42 /* Prototypes for local functions. */
43 static int first_wday (int year, int mon, int wday);
44 static int check_mday (int year, int mon, int mday);
46 # define isleap(year) \
47 ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
49 /* Set to one of the following values to indicate an error.
50 1 the DATEMSK environment variable is null or undefined,
51 2 the template file cannot be opened for reading,
52 3 failed to get file status information,
53 4 the template file is not a regular file,
54 5 an error is encountered while reading the template file,
55 6 memory allication failed (not enough memory available),
56 7 there is no line in the template that matches the input,
57 8 invalid input specification Example: February 31 or a time is
58 specified that can not be represented in a time_t (representing
59 the time in seconds since 00:00:00 UTC, January 1, 1970) */
63 /* Returns the first weekday WDAY of month MON in the year YEAR. */
65 first_wday (int year, int mon, int wday)
72 memset (&tm, 0, sizeof (struct tm));
78 return (1 + (wday - tm.tm_wday + 7) % 7);
82 /* Returns 1 if MDAY is a valid day of the month in month MON of year
83 YEAR, and 0 if it is not. */
85 check_mday (int year, int mon, int mday)
96 if (mday >= 1 && mday <= 31)
103 if (mday >= 1 && mday <= 30)
107 if (mday >= 1 && mday <= (isleap (year) ? 29 : 28))
117 xgetdate_r (const char *string, struct tm *tp,
118 const char *const *template)
129 while((line = *template++))
131 /* Do the conversion. */
132 tp->tm_year = tp->tm_mon = tp->tm_mday = tp->tm_wday = INT_MIN;
133 tp->tm_hour = tp->tm_sec = tp->tm_min = INT_MIN;
137 result = strptime (string, line, tp);
138 if (result && *result == '\0')
142 if (result == NULL || *result != '\0')
145 /* Get current time. */
147 localtime_r (&timer, &tm);
149 /* If only the weekday is given, today is assumed if the given day
150 is equal to the current day and next week if it is less. */
151 if (tp->tm_wday >= 0 && tp->tm_wday <= 6 && tp->tm_year == INT_MIN
152 && tp->tm_mon == INT_MIN && tp->tm_mday == INT_MIN)
154 tp->tm_year = tm.tm_year;
155 tp->tm_mon = tm.tm_mon;
156 tp->tm_mday = tm.tm_mday + (tp->tm_wday - tm.tm_wday + 7) % 7;
160 /* If only the month is given, the current month is assumed if the
161 given month is equal to the current month and next year if it is
162 less and no year is given (the first day of month is assumed if
164 if (tp->tm_mon >= 0 && tp->tm_mon <= 11 && tp->tm_mday == INT_MIN)
166 if (tp->tm_year == INT_MIN)
167 tp->tm_year = tm.tm_year + (((tp->tm_mon - tm.tm_mon) < 0) ? 1 : 0);
168 tp->tm_mday = first_wday (tp->tm_year, tp->tm_mon, tp->tm_wday);
172 /* If no hour, minute and second are given the current hour, minute
173 and second are assumed. */
174 if (tp->tm_hour == INT_MIN && tp->tm_min == INT_MIN && tp->tm_sec == INT_MIN)
176 tp->tm_hour = tm.tm_hour;
177 tp->tm_min = tm.tm_min;
178 tp->tm_sec = tm.tm_sec;
181 /* If no date is given, today is assumed if the given hour is
182 greater than the current hour and tomorrow is assumed if
184 if (tp->tm_hour >= 0 && tp->tm_hour <= 23
185 && tp->tm_year == INT_MIN && tp->tm_mon == INT_MIN
186 && tp->tm_mday == INT_MIN && tp->tm_wday == INT_MIN)
188 tp->tm_year = tm.tm_year;
189 tp->tm_mon = tm.tm_mon;
190 tp->tm_mday = tm.tm_mday + ((tp->tm_hour - tm.tm_hour) < 0 ? 1 : 0);
194 /* Fill in the gaps. */
195 if (tp->tm_year == INT_MIN)
196 tp->tm_year = tm.tm_year;
197 if (tp->tm_hour == INT_MIN)
199 if (tp->tm_min == INT_MIN)
201 if (tp->tm_sec == INT_MIN)
204 /* Check if the day of month is within range, and if the time can be
205 represented in a time_t. We make use of the fact that the mktime
206 call normalizes the struct tm. */
207 if ((!mday_ok && !check_mday (TM_YEAR_BASE + tp->tm_year, tp->tm_mon,
209 || mktime (tp) == (time_t) -1)
218 xgetdate (const char *string, const char *const *template)
220 /* Buffer returned by getdate. */
221 static struct tm tmbuf;
222 int errval = xgetdate_r (string, &tmbuf, template);
226 xgetdate_err = errval;