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Validity checks performed on the time supplied by the IPC

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Cleaned up magic numbers
This commit is contained in:
Michael Chisholm 2006-09-30 11:39:55 +00:00
parent 299d69a1e3
commit 31a9ccffec
1 changed files with 58 additions and 11 deletions
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69
source/filetime.c
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@ -27,6 +27,10 @@
2006-07-11 - Chishm
* Original release
2006-09-30 - Chishm
* Validity checks performed on the time supplied by the IPC
* Cleaned up magic numbers
*/
@ -36,12 +40,44 @@
#include <nds/ipc.h>
#endif
#define HOUR_PM_INDICATOR 40
#define MAX_HOUR 23
#define MAX_MINUTE 59
#define MAX_SECOND 59
#define MAX_YEAR 99
#define MAX_MONTH 12
#define MIN_MONTH 1
#define MAX_DAY 31
#define MIN_DAY 1
// Second values are averages, so time value won't be 100% accurate,
// but should be within the correct month.
#define SECONDS_PER_MINUTE 60
#define SECONDS_PER_HOUR 3600
#define SECONDS_PER_DAY 86400
#define SECONDS_PER_MONTH 2629743
#define SECONDS_PER_YEAR 31556926
u16 _FAT_filetime_getTimeFromRTC (void) {
#ifdef NDS
int hour, minute, second;
hour = (IPC->rtc_hours >= HOUR_PM_INDICATOR ? IPC->rtc_hours - HOUR_PM_INDICATOR : IPC->rtc_hours);
minute = IPC->rtc_minutes;
second = IPC->rtc_seconds;
// Check that the values are all in range.
// If they are not, return 0 (no timestamp)
if ((hour < 0) | (hour > MAX_HOUR)) return 0;
if ((minute < 0) | (minute > MAX_MINUTE)) return 0;
if ((second < 0) | (second > MAX_SECOND)) return 0;
return (
( ( (IPC->rtc_hours > 11 ? IPC->rtc_hours - 40 : IPC->rtc_hours) & 0x1F) << 11) |
( (IPC->rtc_minutes & 0x3F) << 5) |
( (IPC->rtc_seconds >> 1) & 0x1F) );
((hour & 0x1F) << 11) |
((minute & 0x3F) << 5) |
((second >> 1) & 0x1F)
);
#else
return 0;
#endif
@ -50,10 +86,21 @@ u16 _FAT_filetime_getTimeFromRTC (void) {
u16 _FAT_filetime_getDateFromRTC (void) {
#ifdef NDS
int year, month, day;
year = IPC->rtc_year;
month = IPC->rtc_month;
day = IPC->rtc_day;
if ((year < 0) | (year > MAX_YEAR)) return 0;
if ((month < MIN_MONTH) | (month > MAX_MONTH)) return 0;
if ((day < MIN_DAY) | (day > MAX_DAY)) return 0;
return (
( ((IPC->rtc_year + 20) & 0x7F) <<9) |
( (IPC->rtc_month & 0xF) << 5) |
(IPC->rtc_day & 0x1F) );
(((year + 20) & 0x7F) <<9) | // Adjust for MS-FAT base year (1980 vs 2000 for DS clock)
((month & 0xF) << 5) |
(day & 0x1F)
);
#else
return 0;
#endif
@ -76,11 +123,11 @@ time_t _FAT_filetime_to_time_t (u16 time, u16 date) {
// Second values are averages, so time value won't be 100% accurate,
// but should be within the correct month.
result = second
+ minute * 60
+ hour * 3600
+ day * 86400
+ month * 2629743
+ year * 31556926
+ minute * SECONDS_PER_MINUTE
+ hour * SECONDS_PER_HOUR
+ day * SECONDS_PER_DAY
+ month * SECONDS_PER_MONTH
+ year * SECONDS_PER_YEAR
;
return result;