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d436bd52 RK |
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 | |
4 | * files. */ | |
5 | ||
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. | |
10 | ||
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. | |
15 | ||
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. | |
20 | ||
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 | |
24 | 02111-1307 USA. */ | |
25 | ||
26 | #include <limits.h> | |
27 | #include <stdio.h> | |
28 | #include <stdlib.h> | |
29 | #include <string.h> | |
30 | #include <time.h> | |
31 | ||
32 | #include "dateparse.h" | |
33 | ||
34 | #define TM_YEAR_BASE 1900 | |
35 | ||
36 | ||
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); | |
40 | ||
41 | # define isleap(year) \ | |
42 | ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0)) | |
43 | ||
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) */ | |
55 | int xgetdate_err; | |
56 | ||
57 | ||
58 | /* Returns the first weekday WDAY of month MON in the year YEAR. */ | |
59 | static int | |
60 | first_wday (int year, int mon, int wday) | |
61 | { | |
62 | struct tm tm; | |
63 | ||
64 | if (wday == INT_MIN) | |
65 | return 1; | |
66 | ||
67 | memset (&tm, 0, sizeof (struct tm)); | |
68 | tm.tm_year = year; | |
69 | tm.tm_mon = mon; | |
70 | tm.tm_mday = 1; | |
71 | mktime (&tm); | |
72 | ||
73 | return (1 + (wday - tm.tm_wday + 7) % 7); | |
74 | } | |
75 | ||
76 | ||
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. */ | |
79 | static int | |
80 | check_mday (int year, int mon, int mday) | |
81 | { | |
82 | switch (mon) | |
83 | { | |
84 | case 0: | |
85 | case 2: | |
86 | case 4: | |
87 | case 6: | |
88 | case 7: | |
89 | case 9: | |
90 | case 11: | |
91 | if (mday >= 1 && mday <= 31) | |
92 | return 1; | |
93 | break; | |
94 | case 3: | |
95 | case 5: | |
96 | case 8: | |
97 | case 10: | |
98 | if (mday >= 1 && mday <= 30) | |
99 | return 1; | |
100 | break; | |
101 | case 1: | |
102 | if (mday >= 1 && mday <= (isleap (year) ? 29 : 28)) | |
103 | return 1; | |
104 | break; | |
105 | } | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | ||
111 | int | |
112 | xgetdate_r (const char *string, struct tm *tp, | |
113 | const char *const *template) | |
114 | { | |
115 | const char *line; | |
116 | size_t len; | |
117 | char *result = NULL; | |
118 | time_t timer; | |
119 | struct tm tm; | |
120 | int mday_ok = 0; | |
121 | ||
122 | line = NULL; | |
123 | len = 0; | |
124 | while((line = *template++)) | |
125 | { | |
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; | |
129 | tp->tm_isdst = -1; | |
130 | tp->tm_gmtoff = 0; | |
131 | tp->tm_zone = NULL; | |
132 | result = strptime (string, line, tp); | |
133 | if (result && *result == '\0') | |
134 | break; | |
135 | } | |
136 | ||
137 | if (result == NULL || *result != '\0') | |
138 | return 7; | |
139 | ||
140 | /* Get current time. */ | |
141 | time (&timer); | |
142 | localtime_r (&timer, &tm); | |
143 | ||
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) | |
148 | { | |
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; | |
152 | mday_ok = 1; | |
153 | } | |
154 | ||
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 | |
158 | no day is given. */ | |
159 | if (tp->tm_mon >= 0 && tp->tm_mon <= 11 && tp->tm_mday == INT_MIN) | |
160 | { | |
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); | |
164 | mday_ok = 1; | |
165 | } | |
166 | ||
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) | |
170 | { | |
171 | tp->tm_hour = tm.tm_hour; | |
172 | tp->tm_min = tm.tm_min; | |
173 | tp->tm_sec = tm.tm_sec; | |
174 | } | |
175 | ||
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 | |
178 | it is less. */ | |
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) | |
182 | { | |
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); | |
186 | mday_ok = 1; | |
187 | } | |
188 | ||
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) | |
193 | tp->tm_hour = 0; | |
194 | if (tp->tm_min == INT_MIN) | |
195 | tp->tm_min = 0; | |
196 | if (tp->tm_sec == INT_MIN) | |
197 | tp->tm_sec = 0; | |
198 | ||
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, | |
203 | tp->tm_mday)) | |
204 | || mktime (tp) == (time_t) -1) | |
205 | return 8; | |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
210 | ||
211 | ||
212 | struct tm * | |
213 | xgetdate (const char *string, const char *const *template) | |
214 | { | |
215 | /* Buffer returned by getdate. */ | |
216 | static struct tm tmbuf; | |
217 | int errval = xgetdate_r (string, &tmbuf, template); | |
218 | ||
219 | if (errval != 0) | |
220 | { | |
221 | getdate_err = errval; | |
222 | return NULL; | |
223 | } | |
224 | ||
225 | return &tmbuf; | |
226 | } |