Index: fusl/src/time/__secs_to_tm.c |
diff --git a/fusl/src/time/__secs_to_tm.c b/fusl/src/time/__secs_to_tm.c |
index 3a3123a1b457bb65dc7b9c61ecaf017db3f671b1..6017b61ff847e7abb41c6d421672df3f1f09c315 100644 |
--- a/fusl/src/time/__secs_to_tm.c |
+++ b/fusl/src/time/__secs_to_tm.c |
@@ -2,80 +2,85 @@ |
#include <limits.h> |
/* 2000-03-01 (mod 400 year, immediately after feb29 */ |
-#define LEAPOCH (946684800LL + 86400*(31+29)) |
- |
-#define DAYS_PER_400Y (365*400 + 97) |
-#define DAYS_PER_100Y (365*100 + 24) |
-#define DAYS_PER_4Y (365*4 + 1) |
- |
-int __secs_to_tm(long long t, struct tm *tm) |
-{ |
- long long days, secs, years; |
- int remdays, remsecs, remyears; |
- int qc_cycles, c_cycles, q_cycles; |
- int months; |
- int wday, yday, leap; |
- static const char days_in_month[] = {31,30,31,30,31,31,30,31,30,31,31,29}; |
- |
- /* Reject time_t values whose year would overflow int */ |
- if (t < INT_MIN * 31622400LL || t > INT_MAX * 31622400LL) |
- return -1; |
- |
- secs = t - LEAPOCH; |
- days = secs / 86400; |
- remsecs = secs % 86400; |
- if (remsecs < 0) { |
- remsecs += 86400; |
- days--; |
- } |
- |
- wday = (3+days)%7; |
- if (wday < 0) wday += 7; |
- |
- qc_cycles = days / DAYS_PER_400Y; |
- remdays = days % DAYS_PER_400Y; |
- if (remdays < 0) { |
- remdays += DAYS_PER_400Y; |
- qc_cycles--; |
- } |
- |
- c_cycles = remdays / DAYS_PER_100Y; |
- if (c_cycles == 4) c_cycles--; |
- remdays -= c_cycles * DAYS_PER_100Y; |
- |
- q_cycles = remdays / DAYS_PER_4Y; |
- if (q_cycles == 25) q_cycles--; |
- remdays -= q_cycles * DAYS_PER_4Y; |
- |
- remyears = remdays / 365; |
- if (remyears == 4) remyears--; |
- remdays -= remyears * 365; |
- |
- leap = !remyears && (q_cycles || !c_cycles); |
- yday = remdays + 31 + 28 + leap; |
- if (yday >= 365+leap) yday -= 365+leap; |
- |
- years = remyears + 4*q_cycles + 100*c_cycles + 400LL*qc_cycles; |
- |
- for (months=0; days_in_month[months] <= remdays; months++) |
- remdays -= days_in_month[months]; |
- |
- if (years+100 > INT_MAX || years+100 < INT_MIN) |
- return -1; |
- |
- tm->tm_year = years + 100; |
- tm->tm_mon = months + 2; |
- if (tm->tm_mon >= 12) { |
- tm->tm_mon -=12; |
- tm->tm_year++; |
- } |
- tm->tm_mday = remdays + 1; |
- tm->tm_wday = wday; |
- tm->tm_yday = yday; |
- |
- tm->tm_hour = remsecs / 3600; |
- tm->tm_min = remsecs / 60 % 60; |
- tm->tm_sec = remsecs % 60; |
- |
- return 0; |
+#define LEAPOCH (946684800LL + 86400 * (31 + 29)) |
+ |
+#define DAYS_PER_400Y (365 * 400 + 97) |
+#define DAYS_PER_100Y (365 * 100 + 24) |
+#define DAYS_PER_4Y (365 * 4 + 1) |
+ |
+int __secs_to_tm(long long t, struct tm* tm) { |
+ long long days, secs, years; |
+ int remdays, remsecs, remyears; |
+ int qc_cycles, c_cycles, q_cycles; |
+ int months; |
+ int wday, yday, leap; |
+ static const char days_in_month[] = {31, 30, 31, 30, 31, 31, |
+ 30, 31, 30, 31, 31, 29}; |
+ |
+ /* Reject time_t values whose year would overflow int */ |
+ if (t < INT_MIN * 31622400LL || t > INT_MAX * 31622400LL) |
+ return -1; |
+ |
+ secs = t - LEAPOCH; |
+ days = secs / 86400; |
+ remsecs = secs % 86400; |
+ if (remsecs < 0) { |
+ remsecs += 86400; |
+ days--; |
+ } |
+ |
+ wday = (3 + days) % 7; |
+ if (wday < 0) |
+ wday += 7; |
+ |
+ qc_cycles = days / DAYS_PER_400Y; |
+ remdays = days % DAYS_PER_400Y; |
+ if (remdays < 0) { |
+ remdays += DAYS_PER_400Y; |
+ qc_cycles--; |
+ } |
+ |
+ c_cycles = remdays / DAYS_PER_100Y; |
+ if (c_cycles == 4) |
+ c_cycles--; |
+ remdays -= c_cycles * DAYS_PER_100Y; |
+ |
+ q_cycles = remdays / DAYS_PER_4Y; |
+ if (q_cycles == 25) |
+ q_cycles--; |
+ remdays -= q_cycles * DAYS_PER_4Y; |
+ |
+ remyears = remdays / 365; |
+ if (remyears == 4) |
+ remyears--; |
+ remdays -= remyears * 365; |
+ |
+ leap = !remyears && (q_cycles || !c_cycles); |
+ yday = remdays + 31 + 28 + leap; |
+ if (yday >= 365 + leap) |
+ yday -= 365 + leap; |
+ |
+ years = remyears + 4 * q_cycles + 100 * c_cycles + 400LL * qc_cycles; |
+ |
+ for (months = 0; days_in_month[months] <= remdays; months++) |
+ remdays -= days_in_month[months]; |
+ |
+ if (years + 100 > INT_MAX || years + 100 < INT_MIN) |
+ return -1; |
+ |
+ tm->tm_year = years + 100; |
+ tm->tm_mon = months + 2; |
+ if (tm->tm_mon >= 12) { |
+ tm->tm_mon -= 12; |
+ tm->tm_year++; |
+ } |
+ tm->tm_mday = remdays + 1; |
+ tm->tm_wday = wday; |
+ tm->tm_yday = yday; |
+ |
+ tm->tm_hour = remsecs / 3600; |
+ tm->tm_min = remsecs / 60 % 60; |
+ tm->tm_sec = remsecs % 60; |
+ |
+ return 0; |
} |