GRASS GIS 7 Programmer's Manual  7.5.svn(2018)-r72886
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tz1.c
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1 /*
2  * Copyright (C) 1995. Bill Brown <brown@gis.uiuc.edu> & Michael Shapiro
3  *
4  * This program is free software under the GPL (>=v2)
5  * Read the file GPL.TXT coming with GRASS for details.
6  */
7 #include <grass/datetime.h>
8 
9 
10 static int have(int x, const DateTime * dt)
11 {
12  return datetime_is_between(x, dt->from, dt->to);
13 }
14 
15 
16 /*!
17  * \brief
18  *
19  * returns 0 on success
20  *
21  * \param dt
22  * \param minutes
23  * \return int
24  */
25 
26 int datetime_check_timezone(const DateTime * dt, int minutes)
27 {
28  if (!datetime_is_absolute(dt))
29  return datetime_error(-1, "datetime not absolute");
30  if (!have(DATETIME_MINUTE, dt))
31  return datetime_error(-2, "datetime has no minute");
32  if (!datetime_is_valid_timezone(minutes))
33  return datetime_error(-3, "invalid datetime timezone");
34 
35  return 0;
36 }
37 
38 
39 /*!
40  * \brief
41  *
42  * returns 0 on success
43  *
44  * \param dt
45  * \param minutes
46  * \return int
47  */
48 
49 int datetime_get_timezone(const DateTime * dt, int *minutes)
50 {
51  int stat;
52 
53  stat = datetime_check_timezone(dt, dt->tz);
54  if (stat == 0)
55  *minutes = dt->tz;
56 
57  return stat;
58 }
59 
60 
61 /*!
62  * \brief
63  *
64  * returns 0 on success
65  *
66  * \param dt
67  * \param minutes
68  * \return int
69  */
70 
71 int datetime_set_timezone(DateTime * dt, int minutes)
72 {
73  int stat;
74 
75  stat = datetime_check_timezone(dt, minutes);
76  if (stat == 0)
77  dt->tz = minutes;
78 
79  return stat;
80 }
81 
82 /*!
83  * \brief
84  *
85  * unsets timezone in 'dt'
86  * returns 0
87  *
88  * \param dt
89  * \return int
90  */
91 
93 {
94  dt->tz = -9999;
95 
96  return 0;
97 }
98 
99 
100 /*!
101  * \brief
102  *
103  * Returns:
104  * 1 OK: -720 <= minutes <= 780 (720 = 12 hours; 780 = 13 hours)
105  * 0 NOT OK
106  *
107  * \param minutes
108  * \return int
109  */
110 
112 {
113  return (minutes >= -720 && minutes <= 780);
114 }
#define DATETIME_MINUTE
Definition: datetime.h:14
int from
Definition: datetime.h:20
#define x
int datetime_is_between(int x, int a, int b)
Definition: between.c:8
int datetime_is_valid_timezone(int minutes)
Returns: 1 OK: -720 &lt;= minutes &lt;= 780 (720 = 12 hours; 780 = 13 hours) 0 NOT OK.
Definition: tz1.c:111
int datetime_set_timezone(DateTime *dt, int minutes)
returns 0 on success
Definition: tz1.c:71
int datetime_is_absolute(const DateTime *dt)
Returns: 1 if dt.mode is absolute 0 if not (even if dt.mode is not defined)
int datetime_get_timezone(const DateTime *dt, int *minutes)
returns 0 on success
Definition: tz1.c:49
int tz
Definition: datetime.h:26
int datetime_check_timezone(const DateTime *dt, int minutes)
returns 0 on success
Definition: tz1.c:26
int datetime_unset_timezone(DateTime *dt)
unsets timezone in &#39;dt&#39; returns 0
Definition: tz1.c:92
int to
Definition: datetime.h:20
int datetime_error(int code, char *msg)
record &#39;code&#39; and &#39;msg&#39; as error code/msg (in static variables) code==0 will clear the error (ie set ...