time32.c revision 89572
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 89572 2002-01-19 23:20:02Z dillon $ 14 */ 15 16#include <sys/types.h> 17#include <sys/time.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 */ 23time_t 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 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 */ 45time_t 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 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 */ 65long 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 73time_t 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 */ 85int 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 93time_t 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} 100 101