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: src/lib/libc/stdtime/time32.c,v 1.5 2002/06/17 01:42:29 wollman Exp $ 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 24 _time32_to_time(__int32_t t32) 25 { 26 27 return((time_t)t32); 28 } 29 30 /* 31 * Convert time_t to a 32 bit representation. If time_t is 64 bits we can 32 * simply chop it down. The resulting 32 bit representation can be 33 * converted back to a temporally local 64 bit time_t using time32_to_time. 34 */ 35 __int32_t 36 _time_to_time32(time_t t) 37 { 38 39 return((__int32_t)t); 40 } 41 42 /* 43 * Convert a 64 bit representation of time_t into time_t. If time_t is 44 * represented as 32 bits we can simply chop it and not support times 45 * past 2038. 46 */ 47 time_t 48 _time64_to_time(__int64_t t64) 49 { 50 51 return((time_t)t64); 52 } 53 54 /* 55 * Convert time_t to a 64 bit representation. If time_t is represented 56 * as 32 bits we simply sign-extend and do not support times past 2038. 57 */ 58 __int64_t 59 _time_to_time64(time_t t) 60 { 61 62 return((__int64_t)t); 63 } 64 65 /* 66 * Convert to/from 'long'. Depending on the sizeof(long) this may or 67 * may not require using the 50-year rule. 68 */ 69 long 70 _time_to_long(time_t t) 71 { 72 73 if (sizeof(long) == sizeof(__int64_t)) 74 return(_time_to_time64(t)); 75 return((long)t); 76 } 77 78 time_t 79 _long_to_time(long tlong) 80 { 81 82 if (sizeof(long) == sizeof(__int32_t)) 83 return(_time32_to_time(tlong)); 84 return((time_t)tlong); 85 } 86 87 /* 88 * Convert to/from 'int'. Depending on the sizeof(int) this may or 89 * may not require using the 50-year rule. 90 */ 91 int 92 _time_to_int(time_t t) 93 { 94 95 if (sizeof(int) == sizeof(__int64_t)) 96 return(_time_to_time64(t)); 97 return((int)t); 98 } 99 100 time_t 101 _int_to_time(int tint) 102 { 103 104 if (sizeof(int) == sizeof(__int32_t)) 105 return(_time32_to_time(tint)); 106 return((time_t)tint); 107 } 108