AceTime 2.4.0 Date and time classes for Arduino that support timezones from the TZ Database.

TimeOffset.cpp
1 /*
2 * MIT License
3 * Copyright (c) 2018 Brian T. Park
4 */
5
6 #include <string.h> // strlen()
7 #include <AceCommon.h>
8 #include "common/DateStrings.h"
9 #include "TimeOffset.h"
10
11 using ace_common::printPad2To;
12
13 namespace ace_time {
14
15 void TimeOffset::printTo(Print& printer) const {
16 int8_t hour;
17 int8_t minute;
18 int8_t second;
19 toHourMinuteSecond(hour, minute, second);
20
21 if (mSeconds < 0) {
22 printer.print('-');
23 hour = -hour;
24 minute = -minute;
25 second = -second;
26 } else {
27 printer.print('+');
28 }
29 printPad2To(printer, hour, '0');
30 printer.print(':');
31 printPad2To(printer, minute, '0');
32 if (second != 0) {
33 printer.print(':');
34 printPad2To(printer, second, '0');
35 }
36 }
37
38 TimeOffset TimeOffset::forOffsetString(const char* offsetString) {
39 // Verify length of ISO 8601 string, either 6 ("-hh:mm") or 9 ("-hh:mm:ss").
40 uint8_t len = strlen(offsetString);
41 if (len != 6 && len != 9) {
42 return forError();
43 }
44
45 return forOffsetStringChainable(offsetString);
46 }
47
48 TimeOffset TimeOffset::forOffsetStringChainable(const char*& offsetString) {
49 const char* s = offsetString;
50
51 // '+' or '-'
52 char sign = *s++;
53 if (sign != '-' && sign != '+') {
54 return forError();
55 }
56
57 // hour
58 int8_t hour = (*s++ - '0');
59 hour = 10 * hour + (*s++ - '0');
60 s++; // skip ':'
61
62 // minute
63 int8_t minute = (*s++ - '0');
64 minute = 10 * minute + (*s++ - '0');
65
66 // second if necessary
67 int8_t second = 0;
68 if (*s) {
69 s++; // skip ':'
70 second = (*s++ - '0');
71 second = 10 * second + (*s++ - '0');
72 s++;
73 }
74
75 offsetString = s;
76 if (sign == '+') {
77 return forHourMinuteSecond(hour, minute, second);
78 } else {
79 return forHourMinuteSecond(-hour, -minute, -second);
80 }
81 }
82
83 }
ace_time::TimeOffset
A thin wrapper that represents a time offset from a reference point, usually 00:00 at UTC,...
Definition: TimeOffset.h:56
ace_time::TimeOffset::toHourMinuteSecond
void toHourMinuteSecond(int8_t &hour, int8_t &minute, int8_t &second) const
Extract hour, minute, second from the offset.
Definition: TimeOffset.h:149
ace_time::TimeOffset::forOffsetString
static TimeOffset forOffsetString(const char *offsetString)
Create from an offset string (e.g.
Definition: TimeOffset.cpp:38
ace_time::TimeOffset::forError
static TimeOffset forError()
Return an error indicator.
Definition: TimeOffset.h:122
ace_time::TimeOffset::forHourMinuteSecond
static TimeOffset forHourMinuteSecond(int8_t hour, int8_t minute, int8_t second)
Create a TimeOffset fro (hour, minute, second) offset.
Definition: TimeOffset.h:84
ace_time::TimeOffset::printTo
void printTo(Print &printer) const
Print the human readable string, including a "-" or "+" prefix, in the form of "+/-hh:mm" or "+/-hh:m...
Definition: TimeOffset.cpp:15
ace_time::TimeOffset::forOffsetStringChainable
static TimeOffset forOffsetStringChainable(const char *&offsetString)
Variant of forOffsetString() that updates the string pointer to the next unprocessed character.
Definition: TimeOffset.cpp:48