Squash commits for public release

libs/libc/time/time.c

@@ -0,0 +1,125 @@
+#include <sys/time.h>
+#include <sysdep.h>
+#include <time.h>
+
+static const int __days_per_month[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+
+static inline char __is_leap_year(time_t year)
+{
+    return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
+}
+
+static void time_to_tm(time_t timep, tm_t* res)
+{
+    res->tm_sec = timep % 60;
+    time_t minutes = timep / 60;
+    res->tm_min = minutes % 60;
+    time_t hours = minutes / 60;
+    res->tm_hour = hours % 24;
+    time_t days = hours / 24;
+    res->tm_wday = (days + 4) % 7;
+    time_t year = 1970;
+    while (days >= 365 + __is_leap_year(year)) {
+        days -= 365 + __is_leap_year(year);
+        year++;
+    }
+    res->tm_year = year - 1900;
+    res->tm_yday = days;
+    res->tm_mday = 1;
+    if (__is_leap_year(year) && days >= 59) {
+        days--;
+        if (days == 59) {
+            res->tm_mday = 2;
+        }
+    }
+
+    time_t m;
+    for (m = 0; m < 11; m++) {
+        if (days <= __days_per_month[m]) {
+            break;
+        }
+        days -= __days_per_month[m];
+    }
+
+    res->tm_mday += days;
+    res->tm_mon = m;
+}
+
+time_t time(time_t* timep)
+{
+    timeval_t tv;
+    timezone_t tz;
+    if (gettimeofday(&tv, &tz) != 0) {
+        return (time_t)-1;
+    }
+    if (timep) {
+        *timep = tv.tv_sec;
+    }
+    return tv.tv_sec;
+}
+
+char* asctime(const tm_t* tm)
+{
+    return NULL;
+}
+
+char* asctime_r(const tm_t* tm, char* buf)
+{
+    return NULL;
+}
+
+char* ctime(const time_t* timep)
+{
+    return NULL;
+}
+
+char* ctime_r(const time_t* timep, char* buf)
+{
+    return NULL;
+}
+
+tm_t* gmtime(const time_t* timep)
+{
+    static tm_t tm_gmtime_buf;
+    return gmtime_r(timep, &tm_gmtime_buf);
+}
+
+tm_t* gmtime_r(const time_t* timep, tm_t* result)
+{
+    if (!result || !timep) {
+        return NULL;
+    }
+    time_to_tm(*timep, result);
+    return result;
+}
+
+tm_t* localtime(const time_t* timep)
+{
+    static tm_t tm_localtime_buf;
+    return localtime_r(timep, &tm_localtime_buf);
+}
+
+tm_t* localtime_r(const time_t* timep, tm_t* result)
+{
+    // FIXME: Implement time zone
+    if (!result || !timep) {
+        return NULL;
+    }
+    time_to_tm(*timep, result);
+    return result;
+}
+
+time_t mktime(tm_t* tm)
+{
+    return 0;
+}
+
+int clock_gettime(clockid_t clk_id, timespec_t* tp)
+{
+    int res = DO_SYSCALL_2(SYS_CLOCK_GETTIME, clk_id, tp);
+    RETURN_WITH_ERRNO(res, res, -1);
+}
+
+// TODO: Implement
+int clock_getres(clockid_t clk_id, timespec_t* res) { return -1; }
+int clock_settime(clockid_t clk_id, const timespec_t* tp) { return -1; }