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-rw-r--r--src/time64.c114
1 files changed, 53 insertions, 61 deletions
diff --git a/src/time64.c b/src/time64.c
index 8c08caf..cfbe7ac 100644
--- a/src/time64.c
+++ b/src/time64.c
@@ -1,4 +1,4 @@
-/*
+/*
Copyright (c) 2007-2010 Michael G Schwern
@@ -30,7 +30,7 @@ THE SOFTWARE.
Programmers who have available to them 64-bit time values as a 'long
long' type can use localtime64_r() and gmtime64_r() which correctly
-converts the time even on 32-bit systems. Whether you have 64-bit time
+converts the time even on 32-bit systems. Whether you have 64-bit time
values will depend on the operating system.
localtime64_r() is a 64-bit equivalent of localtime_r().
@@ -59,11 +59,11 @@ static const short julian_days_by_month[2][12] = {
{0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335},
};
-static char wday_name[7][4] = {
+static const char wday_name[7][4] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
-static char mon_name[12][4] = {
+static const char mon_name[12][4] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
@@ -176,34 +176,28 @@ static int is_exception_century(Year year)
static int cmp_date( const struct TM* left, const struct tm* right ) {
if( left->tm_year > right->tm_year )
return 1;
- else if( left->tm_year < right->tm_year )
+ if( left->tm_year < right->tm_year )
return -1;
-
if( left->tm_mon > right->tm_mon )
return 1;
- else if( left->tm_mon < right->tm_mon )
+ if( left->tm_mon < right->tm_mon )
return -1;
-
if( left->tm_mday > right->tm_mday )
return 1;
- else if( left->tm_mday < right->tm_mday )
+ if( left->tm_mday < right->tm_mday )
return -1;
-
if( left->tm_hour > right->tm_hour )
return 1;
- else if( left->tm_hour < right->tm_hour )
+ if( left->tm_hour < right->tm_hour )
return -1;
-
if( left->tm_min > right->tm_min )
return 1;
- else if( left->tm_min < right->tm_min )
+ if( left->tm_min < right->tm_min )
return -1;
-
if( left->tm_sec > right->tm_sec )
return 1;
- else if( left->tm_sec < right->tm_sec )
+ if( left->tm_sec < right->tm_sec )
return -1;
-
return 0;
}
@@ -230,15 +224,11 @@ Time64_T timegm64(const struct TM *date) {
Time64_T days = 0;
Time64_T seconds = 0;
Year year;
+ assert(date != NULL);
Year orig_year = (Year)date->tm_year;
int cycles = 0;
- if( orig_year > 100 ) {
- cycles = (orig_year - 100) / 400;
- orig_year -= cycles * 400;
- days += (Time64_T)cycles * days_in_gregorian_cycle;
- }
- else if( orig_year < -300 ) {
+ if( (orig_year > 100) || (orig_year < -300) ) {
cycles = (orig_year - 100) / 400;
orig_year -= cycles * 400;
days += (Time64_T)cycles * days_in_gregorian_cycle;
@@ -293,7 +283,7 @@ static int check_tm(struct TM *tm)
assert(tm->tm_wday >= 0);
assert(tm->tm_wday <= 6);
-
+
assert(tm->tm_yday >= 0);
assert(tm->tm_yday <= length_of_year[IS_LEAP(tm->tm_year)]);
@@ -346,11 +336,11 @@ static Year cycle_offset(Year year)
*/
static int safe_year(const Year year)
{
- int safe_year= (int)year;
+ int _safe_year = (int)year;
Year year_cycle;
if( year >= MIN_SAFE_YEAR && year <= MAX_SAFE_YEAR ) {
- return safe_year;
+ return _safe_year;
}
year_cycle = year + cycle_offset(year);
@@ -368,24 +358,24 @@ static int safe_year(const Year year)
year_cycle += 17;
year_cycle %= SOLAR_CYCLE_LENGTH;
- if( year_cycle < 0 )
+ if( year_cycle < 0 )
year_cycle = SOLAR_CYCLE_LENGTH + year_cycle;
assert( year_cycle >= 0 );
assert( year_cycle < SOLAR_CYCLE_LENGTH );
if( year < MIN_SAFE_YEAR )
- safe_year = safe_years_low[year_cycle];
+ _safe_year = safe_years_low[year_cycle];
else if( year > MAX_SAFE_YEAR )
- safe_year = safe_years_high[year_cycle];
+ _safe_year = safe_years_high[year_cycle];
else
assert(0);
TIME64_TRACE3("# year: %lld, year_cycle: %lld, safe_year: %d\n",
- year, year_cycle, safe_year);
+ year, year_cycle, _safe_year);
- assert(safe_year <= MAX_SAFE_YEAR && safe_year >= MIN_SAFE_YEAR);
+ assert(_safe_year <= MAX_SAFE_YEAR && _safe_year >= MIN_SAFE_YEAR);
- return safe_year;
+ return _safe_year;
}
@@ -519,17 +509,17 @@ static Time64_T seconds_between_years(Year left_year, Year right_year) {
Time64_T mktime64(struct TM *input_date) {
struct tm safe_date;
struct TM date;
- Time64_T time;
+ Time64_T timev;
Year year = input_date->tm_year + 1900;
if( date_in_safe_range(input_date, &SYSTEM_MKTIME_MIN, &SYSTEM_MKTIME_MAX) )
{
copy_TM64_to_tm(input_date, &safe_date);
- time = (Time64_T)mktime(&safe_date);
+ timev = (Time64_T)mktime(&safe_date);
/* Correct the possibly out of bound input date */
copy_tm_to_TM64(&safe_date, input_date);
- return time;
+ return timev;
}
/* Have to make the year safe in date else it won't fit in safe_date */
@@ -537,14 +527,14 @@ Time64_T mktime64(struct TM *input_date) {
date.tm_year = safe_year(year) - 1900;
copy_TM64_to_tm(&date, &safe_date);
- time = (Time64_T)mktime(&safe_date);
+ timev = (Time64_T)mktime(&safe_date);
/* Correct the user's possibly out of bound input date */
copy_tm_to_TM64(&safe_date, input_date);
- time += seconds_between_years(year, (Year)(safe_date.tm_year + 1900));
+ timev += seconds_between_years(year, (Year)(safe_date.tm_year) + 1900);
- return time;
+ return timev;
}
@@ -560,7 +550,7 @@ struct TM *gmtime64_r (const Time64_T *in_time, struct TM *p)
Time64_T v_tm_tday;
int leap;
Time64_T m;
- Time64_T time = *in_time;
+ Time64_T timev = *in_time;
Year year = 70;
int cycles = 0;
@@ -587,13 +577,13 @@ struct TM *gmtime64_r (const Time64_T *in_time, struct TM *p)
p->tm_zone = (char*)"UTC";
#endif
- v_tm_sec = (int)(time % 60);
- time /= 60;
- v_tm_min = (int)(time % 60);
- time /= 60;
- v_tm_hour = (int)(time % 24);
- time /= 24;
- v_tm_tday = time;
+ v_tm_sec = (int)(timev % 60);
+ timev /= 60;
+ v_tm_min = (int)(timev % 60);
+ timev /= 60;
+ v_tm_hour = (int)(timev % 24);
+ timev /= 24;
+ v_tm_tday = timev;
WRAP (v_tm_sec, v_tm_min, 60);
WRAP (v_tm_min, v_tm_hour, 60);
@@ -674,14 +664,14 @@ struct TM *gmtime64_r (const Time64_T *in_time, struct TM *p)
p->tm_hour = v_tm_hour;
p->tm_mon = v_tm_mon;
p->tm_wday = v_tm_wday;
-
+
assert(check_tm(p));
return p;
}
-struct TM *localtime64_r (const Time64_T *time, struct TM *local_tm)
+struct TM *localtime64_r (const Time64_T *timev, struct TM *local_tm)
{
time_t safe_time;
struct tm safe_date;
@@ -692,10 +682,10 @@ struct TM *localtime64_r (const Time64_T *time, struct TM *local_tm)
assert(local_tm != NULL);
/* Use the system localtime() if time_t is small enough */
- if( SHOULD_USE_SYSTEM_LOCALTIME(*time) ) {
- safe_time = (time_t)*time;
+ if( SHOULD_USE_SYSTEM_LOCALTIME(*timev) ) {
+ safe_time = (time_t)*timev;
- TIME64_TRACE1("Using system localtime for %lld\n", *time);
+ TIME64_TRACE1("Using system localtime for %lld\n", *timev);
LOCALTIME_R(&safe_time, &safe_date);
@@ -705,8 +695,8 @@ struct TM *localtime64_r (const Time64_T *time, struct TM *local_tm)
return local_tm;
}
- if( gmtime64_r(time, &gm_tm) == NULL ) {
- TIME64_TRACE1("gmtime64_r returned null for %lld\n", *time);
+ if( gmtime64_r(timev, &gm_tm) == NULL ) {
+ TIME64_TRACE1("gmtime64_r returned null for %lld\n", *timev);
return NULL;
}
@@ -717,7 +707,7 @@ struct TM *localtime64_r (const Time64_T *time, struct TM *local_tm)
)
{
TIME64_TRACE1("Mapping tm_year %lld to safe_year\n", (Year)gm_tm.tm_year);
- gm_tm.tm_year = safe_year((Year)(gm_tm.tm_year + 1900)) - 1900;
+ gm_tm.tm_year = safe_year((Year)(gm_tm.tm_year) + 1900) - 1900;
}
safe_time = (time_t)timegm64(&gm_tm);
@@ -756,7 +746,7 @@ struct TM *localtime64_r (const Time64_T *time, struct TM *local_tm)
local_tm->tm_year++;
}
- /* GMT is Jan 1st, xx01 year, but localtime is still Dec 31st
+ /* GMT is Jan 1st, xx01 year, but localtime is still Dec 31st
in a non-leap xx00. There is one point in the cycle
we can't account for which the safe xx00 year is a leap
year. So we need to correct for Dec 31st comming out as
@@ -766,7 +756,7 @@ struct TM *localtime64_r (const Time64_T *time, struct TM *local_tm)
local_tm->tm_yday--;
assert(check_tm(local_tm));
-
+
return local_tm;
}
@@ -774,15 +764,15 @@ struct TM *localtime64_r (const Time64_T *time, struct TM *local_tm)
static int valid_tm_wday( const struct TM* date ) {
if( 0 <= date->tm_wday && date->tm_wday <= 6 )
return 1;
- else
- return 0;
+
+ return 0;
}
static int valid_tm_mon( const struct TM* date ) {
if( 0 <= date->tm_mon && date->tm_mon <= 11 )
return 1;
- else
- return 0;
+
+ return 0;
}
@@ -803,10 +793,12 @@ char *asctime64_r( const struct TM* date, char *result ) {
}
-char *ctime64_r( const Time64_T* time, char* result ) {
+char *ctime64_r( const Time64_T* timev, char* result ) {
struct TM date;
- localtime64_r( time, &date );
+ if (!localtime64_r( timev, &date ))
+ return NULL;
+
return asctime64_r( &date, result );
}
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