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LibC: Fix a bug involving miscalculating week counts of last year

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howar6hill 2020-03-08 19:50:56 +08:00 committed by Andreas Kling
parent df40847c52
commit e72fb8f594
Notes: sideshowbarker 2024-07-19 17:37:17 +09:00 
Author: https://github.com/f-eiwu
Commit: https://github.com/SerenityOS/serenity/commit/e72fb8f5944
Pull-request: https://github.com/SerenityOS/serenity/pull/1383
1 changed files with 17 additions and 20 deletions
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37
Libraries/LibC/time.cpp
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@ -148,24 +148,6 @@ struct tm* gmtime_r(const time_t* t, struct tm* tm)
return tm;
}
static char wday_short_names[7][4] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
static char wday_long_names[7][10] = {
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
};
static char mon_short_names[12][4] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static char mon_long_names[12][10] = {
"January", "February", "March", "April", "May", "June",
"July", "Auguest", "September", "October", "November", "December"
};
char* asctime(const struct tm* tm)
{
static char buffer[69];
@ -176,6 +158,21 @@ char* asctime(const struct tm* tm)
//FIXME: Some formats are not supported.
size_t strftime(char* destination, size_t max_size, const char* format, const struct tm* tm)
{
const char wday_short_names[7][4] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
const char wday_long_names[7][10] = {
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
};
const char mon_short_names[12][4] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
const char mon_long_names[12][10] = {
"January", "February", "March", "April", "May", "June",
"July", "Auguest", "September", "October", "November", "December"
};
StringBuilder builder { max_size - 1 };
const int format_len = strlen(format);
@ -266,10 +263,10 @@ size_t strftime(char* destination, size_t max_size, const char* format, const st
if (tm->tm_yday >= 7 - wday_of_year_beginning)
--week_number;
else {
const int days_of_last_year = 365 + __is_leap_year(tm->tm_year + 1900);
const int days_of_last_year = 365 + __is_leap_year(tm->tm_year + 1900 - 1);
const int wday_of_last_year_beginning = (wday_of_year_beginning + 6 * days_of_last_year) % 7;
week_number = (days_of_last_year + wday_of_last_year_beginning) / 7 + 1;
if (wday_of_year_beginning > 3)
if (wday_of_last_year_beginning > 3)
--week_number;
}
}