1 #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. */ 28 struct 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 48 static 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 69 static 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 97 /* compute hour, min, and sec */ 98 res->tm_hour = (int) (rem / SECSPERHOUR); 99 rem %= SECSPERHOUR; 100 res->tm_min = (int) (rem / SECSPERMIN); 101 res->tm_sec = (int) (rem % SECSPERMIN); 102 103 /* compute day of week */ 104 if ((res->tm_wday = ((EPOCH_WDAY + days) % DAYSPERWEEK)) < 0) 105 res->tm_wday += DAYSPERWEEK; 106 107 /* compute year & day of year */ 108 y = EPOCH_YEAR; 109 if (days >= 0) 110 { 111 for (;;) 112 { 113 yleap = isleap(y); 114 if (days < year_lengths[yleap]) 115 break; 116 y++; 117 days -= year_lengths[yleap]; 118 } 119 } 120 else 121 { 122 do 123 { 124 --y; 125 yleap = isleap(y); 126 days += year_lengths[yleap]; 127 } while (days < 0); 128 } 129 130 res->tm_year = y - YEAR_BASE; 131 res->tm_yday = days; 132 ip = mon_lengths[yleap]; 133 for (res->tm_mon = 0; days >= ip[res->tm_mon]; ++res->tm_mon) 134 days -= ip[res->tm_mon]; 135 res->tm_mday = days + 1; 136 137 /* set daylight saving time flag */ 138 res->tm_isdst = -1; 139 140 return (res); 141 } 142 143 static inline char * 144 _DEFUN (ctime_r, (tim_p, result), 145 _CONST time_t * tim_p _AND 146 char * result) 147 148 { 149 struct tm tm; 150 return asctime_r (localtime_r (tim_p, &tm), result); 151 } 152 153 #endif 154