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mytimegm: replace with own implementation

pull/173/head
Leah Neukirchen 2年前
コミット
604afb5011
  1. 2
      COPYING
  2. 2
      blaze822.c
  3. 2
      blaze822.h
  4. 104
      mytimegm.c

2
COPYING

@ -5,7 +5,7 @@ has waived all copyright and related or neighboring rights to this work.
http://creativecommons.org/publicdomain/zero/1.0/
The files mystrverscmp.c and mymemmem.c and mytimegm.c
The files mystrverscmp.c and mymemmem
are MIT-licensed and were written by Rich Felker.
mpick.c is largely based on code by Leah Neukirchen

2
blaze822.c

@ -121,7 +121,7 @@ blaze822_date(char *s) {
tm.tm_isdst = -1;
time_t r = tm_to_secs(&tm);
time_t r = mytimegm(&tm);
return r;
fail:

2
blaze822.h

@ -85,7 +85,7 @@ int filter(char *input, size_t inlen, char *cmd, char **outputo, size_t *outleno
// mygmtime.c
time_t tm_to_secs(const struct tm *tm);
time_t mytimegm(const struct tm *tm);
// slurp.c

104
mytimegm.c

@ -1,86 +1,28 @@
#include <time.h>
// from musl@1cc81f5cb, slightly tweaked
static long long
__year_to_secs(long long year, int *is_leap)
{
if (year-2ULL <= 136) {
int y = year;
int leaps = (y-68)>>2;
if (!((y-68)&3)) {
leaps--;
if (is_leap) *is_leap = 1;
} else if (is_leap) *is_leap = 0;
return 31536000*(y-70) + 86400*leaps;
}
int cycles, centuries, leaps, rem;
cycles = (year-100) / 400;
rem = (year-100) % 400;
if (rem < 0) {
cycles--;
rem += 400;
}
if (!rem) {
*is_leap = 1;
centuries = 0;
leaps = 0;
} else {
if (rem >= 200) {
if (rem >= 300) centuries = 3, rem -= 300;
else centuries = 2, rem -= 200;
} else {
if (rem >= 100) centuries = 1, rem -= 100;
else centuries = 0;
}
if (!rem) {
*is_leap = 0;
leaps = 0;
} else {
leaps = rem / 4U;
rem %= 4U;
*is_leap = !rem;
}
}
leaps += 97*cycles + 24*centuries - *is_leap;
return (year-100) * 31536000LL + leaps * 86400LL + 946684800 + 86400;
}
static int
__month_to_secs(int month, int is_leap)
{
static const int secs_through_month[] = {
0, 31*86400, 59*86400, 90*86400,
120*86400, 151*86400, 181*86400, 212*86400,
243*86400, 273*86400, 304*86400, 334*86400 };
int t = secs_through_month[month];
if (is_leap && month >= 2) t+=86400;
return t;
}
time_t tm_to_secs(const struct tm *tm)
time_t
mytimegm(struct tm *tm)
{
int is_leap;
long long year = tm->tm_year;
int month = tm->tm_mon;
if (month >= 12 || month < 0) {
int adj = month / 12;
month %= 12;
if (month < 0) {
adj--;
month += 12;
}
year += adj;
}
long long t = __year_to_secs(year, &is_leap);
t += __month_to_secs(month, is_leap);
t += 86400LL * (tm->tm_mday-1);
t += 3600LL * tm->tm_hour;
t += 60LL * tm->tm_min;
t += tm->tm_sec;
int mon = tm->tm_mon + 1 - 2; /* put March first, Feb last */
long long year = tm->tm_year + 1900;
if (mon <= 0 || mon >= 12) {
int adj = mon / 12;
mon %= 12;
if (mon <= 0) {
adj--;
mon += 12;
}
year += adj;
}
time_t t = 0;
t += tm->tm_sec;
t += 60 * tm->tm_min;
t += 60*60 * tm->tm_hour;
t += 24*60*60 * (tm->tm_mday - 1);
t += 24*60*60 * (367*mon/12);
t += 24*60*60 * (year/4 - year/100 + year/400);
t += 24*60*60 * (365*year - 719498L);
return t;
}

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