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wdenk012771d2002-03-08 21:31:05 +00001#ifndef _LINUX_TIME_H
2#define _LINUX_TIME_H
3
4#include <linux/types.h>
5
6#define _DEFUN(a,b,c) a(c)
7#define _CONST const
8#define _AND ,
9
10#define _REENT_ONLY
11
12#define SECSPERMIN 60L
13#define MINSPERHOUR 60L
14#define HOURSPERDAY 24L
15#define SECSPERHOUR (SECSPERMIN * MINSPERHOUR)
16#define SECSPERDAY (SECSPERHOUR * HOURSPERDAY)
17#define DAYSPERWEEK 7
18#define MONSPERYEAR 12
19
20#define YEAR_BASE 1900
21#define EPOCH_YEAR 1970
22#define EPOCH_WDAY 4
23
24#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
25
26
27/* Used by other time functions. */
28struct tm {
29 int tm_sec; /* Seconds. [0-60] (1 leap second) */
30 int tm_min; /* Minutes. [0-59] */
31 int tm_hour; /* Hours. [0-23] */
32 int tm_mday; /* Day. [1-31] */
33 int tm_mon; /* Month. [0-11] */
34 int tm_year; /* Year - 1900. */
35 int tm_wday; /* Day of week. [0-6] */
36 int tm_yday; /* Days in year.[0-365] */
37 int tm_isdst; /* DST. [-1/0/1]*/
38
39# ifdef __USE_BSD
40 long int tm_gmtoff; /* Seconds east of UTC. */
41 __const char *tm_zone; /* Timezone abbreviation. */
42# else
43 long int __tm_gmtoff; /* Seconds east of UTC. */
44 __const char *__tm_zone; /* Timezone abbreviation. */
45# endif
46};
47
48static inline char *
49_DEFUN (asctime_r, (tim_p, result),
50 _CONST struct tm *tim_p _AND
51 char *result)
52{
53 static _CONST char day_name[7][3] = {
54 "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
55 };
56 static _CONST char mon_name[12][3] = {
57 "Jan", "Feb", "Mar", "Apr", "May", "Jun",
58 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
59 };
60
61 sprintf (result, "%.3s %.3s %.2d %.2d:%.2d:%.2d %d\n",
62 day_name[tim_p->tm_wday],
63 mon_name[tim_p->tm_mon],
64 tim_p->tm_mday, tim_p->tm_hour, tim_p->tm_min,
65 tim_p->tm_sec, 1900 + tim_p->tm_year);
66 return result;
67}
68
69static inline struct tm *
70_DEFUN (localtime_r, (tim_p, res),
71 _CONST time_t * tim_p _AND
72 struct tm *res)
73{
74 static _CONST int mon_lengths[2][MONSPERYEAR] = {
75 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
76 {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
77 } ;
78
79 static _CONST int year_lengths[2] = {
80 365,
81 366
82 } ;
83
84 long days, rem;
85 int y;
86 int yleap;
87 _CONST int *ip;
88
89 days = ((long) *tim_p) / SECSPERDAY;
90 rem = ((long) *tim_p) % SECSPERDAY;
91 while (rem < 0)
92 {
93 rem += SECSPERDAY;
94 --days;
95 }
96 while (rem >= SECSPERDAY)
97 {
98 rem -= SECSPERDAY;
99 ++days;
100 }
101
102 /* compute hour, min, and sec */
103 res->tm_hour = (int) (rem / SECSPERHOUR);
104 rem %= SECSPERHOUR;
105 res->tm_min = (int) (rem / SECSPERMIN);
106 res->tm_sec = (int) (rem % SECSPERMIN);
107
108 /* compute day of week */
109 if ((res->tm_wday = ((EPOCH_WDAY + days) % DAYSPERWEEK)) < 0)
110 res->tm_wday += DAYSPERWEEK;
111
112 /* compute year & day of year */
113 y = EPOCH_YEAR;
114 if (days >= 0)
115 {
116 for (;;)
117 {
118 yleap = isleap(y);
119 if (days < year_lengths[yleap])
120 break;
121 y++;
122 days -= year_lengths[yleap];
123 }
124 }
125 else
126 {
127 do
128 {
129 --y;
130 yleap = isleap(y);
131 days += year_lengths[yleap];
132 } while (days < 0);
133 }
134
135 res->tm_year = y - YEAR_BASE;
136 res->tm_yday = days;
137 ip = mon_lengths[yleap];
138 for (res->tm_mon = 0; days >= ip[res->tm_mon]; ++res->tm_mon)
139 days -= ip[res->tm_mon];
140 res->tm_mday = days + 1;
141
142 /* set daylight saving time flag */
143 res->tm_isdst = -1;
144
145 return (res);
146}
147
148static inline char *
149_DEFUN (ctime_r, (tim_p, result),
150 _CONST time_t * tim_p _AND
151 char * result)
152
153{
154 struct tm tm;
155 return asctime_r (localtime_r (tim_p, &tm), result);
156}
157
158#endif