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authorwdenk <wdenk>2002-03-08 21:31:05 +0000
committerwdenk <wdenk>2002-03-08 21:31:05 +0000
commit012771d88adfb5e0886591880041f05fc8b15bdd (patch)
tree9cd947b8b4c6f05cff5be1b69a0f1ca81b2c86ec /include/linux/time.h
parent67fc21f34ef642417e7418a0575d5b5ff70d77d8 (diff)
Initial revision
Diffstat (limited to 'include/linux/time.h')
-rw-r--r--include/linux/time.h158
1 files changed, 158 insertions, 0 deletions
diff --git a/include/linux/time.h b/include/linux/time.h
new file mode 100644
index 00000000000..bf12b99d37b
--- /dev/null
+++ b/include/linux/time.h
@@ -0,0 +1,158 @@
+#ifndef _LINUX_TIME_H
+#define _LINUX_TIME_H
+
+#include <linux/types.h>
+
+#define _DEFUN(a,b,c) a(c)
+#define _CONST const
+#define _AND ,
+
+#define _REENT_ONLY
+
+#define SECSPERMIN 60L
+#define MINSPERHOUR 60L
+#define HOURSPERDAY 24L
+#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
+#define SECSPERDAY (SECSPERHOUR * HOURSPERDAY)
+#define DAYSPERWEEK 7
+#define MONSPERYEAR 12
+
+#define YEAR_BASE 1900
+#define EPOCH_YEAR 1970
+#define EPOCH_WDAY 4
+
+#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
+
+
+/* Used by other time functions. */
+struct tm {
+ int tm_sec; /* Seconds. [0-60] (1 leap second) */
+ int tm_min; /* Minutes. [0-59] */
+ int tm_hour; /* Hours. [0-23] */
+ int tm_mday; /* Day. [1-31] */
+ int tm_mon; /* Month. [0-11] */
+ int tm_year; /* Year - 1900. */
+ int tm_wday; /* Day of week. [0-6] */
+ int tm_yday; /* Days in year.[0-365] */
+ int tm_isdst; /* DST. [-1/0/1]*/
+
+# ifdef __USE_BSD
+ long int tm_gmtoff; /* Seconds east of UTC. */
+ __const char *tm_zone; /* Timezone abbreviation. */
+# else
+ long int __tm_gmtoff; /* Seconds east of UTC. */
+ __const char *__tm_zone; /* Timezone abbreviation. */
+# endif
+};
+
+static inline char *
+_DEFUN (asctime_r, (tim_p, result),
+ _CONST struct tm *tim_p _AND
+ char *result)
+{
+ static _CONST char day_name[7][3] = {
+ "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+ };
+ static _CONST char mon_name[12][3] = {
+ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+ "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+ };
+
+ sprintf (result, "%.3s %.3s %.2d %.2d:%.2d:%.2d %d\n",
+ day_name[tim_p->tm_wday],
+ mon_name[tim_p->tm_mon],
+ tim_p->tm_mday, tim_p->tm_hour, tim_p->tm_min,
+ tim_p->tm_sec, 1900 + tim_p->tm_year);
+ return result;
+}
+
+static inline struct tm *
+_DEFUN (localtime_r, (tim_p, res),
+ _CONST time_t * tim_p _AND
+ struct tm *res)
+{
+ static _CONST int mon_lengths[2][MONSPERYEAR] = {
+ {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
+ {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
+ } ;
+
+ static _CONST int year_lengths[2] = {
+ 365,
+ 366
+ } ;
+
+ long days, rem;
+ int y;
+ int yleap;
+ _CONST int *ip;
+
+ days = ((long) *tim_p) / SECSPERDAY;
+ rem = ((long) *tim_p) % SECSPERDAY;
+ while (rem < 0)
+ {
+ rem += SECSPERDAY;
+ --days;
+ }
+ while (rem >= SECSPERDAY)
+ {
+ rem -= SECSPERDAY;
+ ++days;
+ }
+
+ /* compute hour, min, and sec */
+ res->tm_hour = (int) (rem / SECSPERHOUR);
+ rem %= SECSPERHOUR;
+ res->tm_min = (int) (rem / SECSPERMIN);
+ res->tm_sec = (int) (rem % SECSPERMIN);
+
+ /* compute day of week */
+ if ((res->tm_wday = ((EPOCH_WDAY + days) % DAYSPERWEEK)) < 0)
+ res->tm_wday += DAYSPERWEEK;
+
+ /* compute year & day of year */
+ y = EPOCH_YEAR;
+ if (days >= 0)
+ {
+ for (;;)
+ {
+ yleap = isleap(y);
+ if (days < year_lengths[yleap])
+ break;
+ y++;
+ days -= year_lengths[yleap];
+ }
+ }
+ else
+ {
+ do
+ {
+ --y;
+ yleap = isleap(y);
+ days += year_lengths[yleap];
+ } while (days < 0);
+ }
+
+ res->tm_year = y - YEAR_BASE;
+ res->tm_yday = days;
+ ip = mon_lengths[yleap];
+ for (res->tm_mon = 0; days >= ip[res->tm_mon]; ++res->tm_mon)
+ days -= ip[res->tm_mon];
+ res->tm_mday = days + 1;
+
+ /* set daylight saving time flag */
+ res->tm_isdst = -1;
+
+ return (res);
+}
+
+static inline char *
+_DEFUN (ctime_r, (tim_p, result),
+ _CONST time_t * tim_p _AND
+ char * result)
+
+{
+ struct tm tm;
+ return asctime_r (localtime_r (tim_p, &tm), result);
+}
+
+#endif