1 /*- 2 * Copyright (c) 2001 FreeBSD Inc. 3 * All rights reserved. 4 * 5 * These routines are for converting time_t to fixed-bit representations 6 * for use in protocols or storage. When converting time to a larger 7 * representation of time_t these routines are expected to assume temporal 8 * locality and use the 50-year rule to properly set the msb bits. XXX 9 * 10 * Redistribution and use under the terms of the COPYRIGHT file at the 11 * base of the source tree. 12 * 13 * $FreeBSD: head/lib/libc/stdtime/time32.c 98313 2002-06-17 01:42:33Z wollman $ 14 */ 15 16 #include <sys/types.h> 17 #include <timeconv.h> 18 19 /* 20 * Convert a 32 bit representation of time_t into time_t. XXX needs to 21 * implement the 50-year rule to handle post-2038 conversions. 22 */ 23 time_t _time32_to_time(__int32_t t32)24_time32_to_time(__int32_t t32) 25 { 26 return((time_t)t32); 27 } 28 29 /* 30 * Convert time_t to a 32 bit representation. If time_t is 64 bits we can 31 * simply chop it down. The resulting 32 bit representation can be 32 * converted back to a temporally local 64 bit time_t using time32_to_time. 33 */ 34 __int32_t _time_to_time32(time_t t)35_time_to_time32(time_t t) 36 { 37 return((__int32_t)t); 38 } 39 40 /* 41 * Convert a 64 bit representation of time_t into time_t. If time_t is 42 * represented as 32 bits we can simply chop it and not support times 43 * past 2038. 44 */ 45 time_t _time64_to_time(__int64_t t64)46_time64_to_time(__int64_t t64) 47 { 48 return((time_t)t64); 49 } 50 51 /* 52 * Convert time_t to a 64 bit representation. If time_t is represented 53 * as 32 bits we simply sign-extend and do not support times past 2038. 54 */ 55 __int64_t _time_to_time64(time_t t)56_time_to_time64(time_t t) 57 { 58 return((__int64_t)t); 59 } 60 61 /* 62 * Convert to/from 'long'. Depending on the sizeof(long) this may or 63 * may not require using the 50-year rule. 64 */ 65 long _time_to_long(time_t t)66_time_to_long(time_t t) 67 { 68 if (sizeof(long) == sizeof(__int64_t)) 69 return(_time_to_time64(t)); 70 return((long)t); 71 } 72 73 time_t _long_to_time(long tlong)74_long_to_time(long tlong) 75 { 76 if (sizeof(long) == sizeof(__int32_t)) 77 return(_time32_to_time(tlong)); 78 return((time_t)tlong); 79 } 80 81 /* 82 * Convert to/from 'int'. Depending on the sizeof(int) this may or 83 * may not require using the 50-year rule. 84 */ 85 int _time_to_int(time_t t)86_time_to_int(time_t t) 87 { 88 if (sizeof(int) == sizeof(__int64_t)) 89 return(_time_to_time64(t)); 90 return((int)t); 91 } 92 93 time_t _int_to_time(int tint)94_int_to_time(int tint) 95 { 96 if (sizeof(int) == sizeof(__int32_t)) 97 return(_time32_to_time(tint)); 98 return((time_t)tint); 99 } 100