GRASS GIS 8 Programmer's Manual 8.3.2(2024)-exported
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datetime/format.c
Go to the documentation of this file.
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 <stdio.h>
8#include <string.h>
9#include <grass/datetime.h>
10
11static char *months[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
12 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
13
14/*!
15 * \brief
16 *
17 * formats DateTime structure as a human-readable string
18 * returns 0 when successful and 'buf' is filled with the string
19 * returns a negative number on error
20 *
21 * \param dt
22 * \param buf
23 * \return int
24 */
25
26int datetime_format(const DateTime *dt, char *buf)
27{
28 /* Format the DateTime structure as a human-readable string */
29 /* Returns 0 when successful, and buf is filled with the
30 formatted data.
31 Returns a negative number as an error code if the DateTime
32 structure is not valid.
33 */
34 char temp[128];
35 int n;
36 double sec;
37
38 *buf = 0;
40 return datetime_error_code();
41
42 if (datetime_is_absolute(dt)) {
43 if (datetime_get_day(dt, &n) == 0) {
44 sprintf(temp, "%d", n);
45 strcat(buf, temp);
46 }
47
48 if (datetime_get_month(dt, &n) == 0) {
49 if (*buf)
50 strcat(buf, " ");
51 strcat(buf, months[n - 1]);
52 }
53
54 if (datetime_get_year(dt, &n) == 0) {
55 if (*buf)
56 strcat(buf, " ");
57 sprintf(temp, "%d", n);
58 strcat(buf, temp);
60 strcat(buf, " bc");
61 }
62
63 if (datetime_get_hour(dt, &n) == 0) {
64 if (*buf)
65 strcat(buf, " ");
66 sprintf(temp, "%02d", n);
67 strcat(buf, temp);
68 }
69
70 if (datetime_get_minute(dt, &n) == 0) {
71 if (*buf)
72 strcat(buf, ":");
73 sprintf(temp, "%02d", n);
74 strcat(buf, temp);
75 }
76
77 if (datetime_get_second(dt, &sec) == 0) {
78 if (*buf)
79 strcat(buf, ":");
80 if (datetime_get_fracsec(dt, &n) != 0)
81 n = 0;
82 sprintf(temp, "%02.*f", n, sec);
83 strcat(buf, temp);
84 }
85
86 if (datetime_get_timezone(dt, &n) == 0) {
87 int hour, minute;
88
89 if (*buf)
90 strcat(buf, " ");
91 datetime_decompose_timezone(n, &hour, &minute);
92 sprintf(temp, "%s%02d%02d", n < 0 ? "-" : "+", hour, minute);
93 strcat(buf, temp);
94 }
95 }
96
97 if (datetime_is_relative(dt)) {
99 strcat(buf, "-");
100
101 if (datetime_get_year(dt, &n) == 0) {
102 if (*buf)
103 strcat(buf, " ");
104 sprintf(temp, "%d year%s", n, n == 1 ? "" : "s");
105 strcat(buf, temp);
106 }
107
108 if (datetime_get_month(dt, &n) == 0) {
109 if (*buf)
110 strcat(buf, " ");
111 sprintf(temp, "%d month%s", n, n == 1 ? "" : "s");
112 strcat(buf, temp);
113 }
114
115 if (datetime_get_day(dt, &n) == 0) {
116 if (*buf)
117 strcat(buf, " ");
118 sprintf(temp, "%d day%s", n, n == 1 ? "" : "s");
119 strcat(buf, temp);
120 }
121
122 if (datetime_get_hour(dt, &n) == 0) {
123 if (*buf)
124 strcat(buf, " ");
125 sprintf(temp, "%d hour%s", n, n == 1 ? "" : "s");
126 strcat(buf, temp);
127 }
128
129 if (datetime_get_minute(dt, &n) == 0) {
130 if (*buf)
131 strcat(buf, " ");
132 sprintf(temp, "%d minute%s", n, n == 1 ? "" : "s");
133 strcat(buf, temp);
134 }
135
136 if (datetime_get_second(dt, &sec) == 0) {
137 if (*buf)
138 strcat(buf, " ");
139 if (datetime_get_fracsec(dt, &n) != 0)
140 n = 0;
141 sprintf(temp, "%.*f second%s", n, sec,
142 (sec == 1.0 && n == 0) ? "" : "s");
143 strcat(buf, temp);
144 }
145 }
146
147 return 0;
148}
int datetime_error_code(void)
returns an error code
int datetime_format(const DateTime *dt, char *buf)
formats DateTime structure as a human-readable string returns 0 when successful and 'buf' is filled w...
int datetime_is_negative(const DateTime *dt)
Returns: 1 if the DateTime is negative 0 otherwise.
Definition sign.c:36
int datetime_is_valid_type(const DateTime *dt)
Returns: 1 if datetime_check_type() returns 0 0 if not.
Definition type.c:77
int datetime_is_absolute(const DateTime *dt)
Returns: 1 if dt.mode is absolute 0 if not (even if dt.mode is not defined)
Definition type.c:168
int datetime_is_relative(const DateTime *dt)
Returns: 1 if dt.mode is relative 0 if not (even if dt.mode is not defined)
Definition type.c:184
int datetime_get_timezone(const DateTime *dt, int *minutes)
returns 0 on success
Definition tz1.c:46
void datetime_decompose_timezone(int tz, int *hours, int *minutes)
tz = abs(tz) *hour = tz/60 *minute = tz%60 Note: hour,minute are non-negative. Must look at sign of t...
Definition tz2.c:82
int datetime_get_second(const DateTime *dt, double *second)
returns 0 on success or negative value on error
Definition values.c:445
int datetime_get_fracsec(const DateTime *dt, int *fracsec)
returns 0 on success or negative value on error
Definition values.c:487
int datetime_get_hour(const DateTime *dt, int *hour)
returns 0 on success or negative value on error
Definition values.c:361
int datetime_get_year(const DateTime *dt, int *year)
returns 0 on success or negative value on error
Definition values.c:218
int datetime_get_minute(const DateTime *dt, int *minute)
returns 0 on success or negative value on error
Definition values.c:403
int datetime_get_day(const DateTime *dt, int *day)
returns 0 on success or negative value on error
Definition values.c:312
int datetime_get_month(const DateTime *dt, int *month)
returns 0 on success or negative value on error
Definition values.c:265