1f4228790SPeter Avalos /*- 2f4228790SPeter Avalos * Copyright (c) 2001 FreeBSD Inc. 3f4228790SPeter Avalos * All rights reserved. 4f4228790SPeter Avalos * 5f4228790SPeter Avalos * These routines are for converting time_t to fixed-bit representations 6f4228790SPeter Avalos * for use in protocols or storage. When converting time to a larger 7f4228790SPeter Avalos * representation of time_t these routines are expected to assume temporal 8f4228790SPeter Avalos * locality and use the 50-year rule to properly set the msb bits. XXX 9f4228790SPeter Avalos * 10f4228790SPeter Avalos * Redistribution and use under the terms of the COPYRIGHT file at the 11f4228790SPeter Avalos * base of the source tree. 12f4228790SPeter Avalos * 13*0d5acd74SJohn Marino * $FreeBSD: head/lib/libc/stdtime/time32.c 98313 2002-06-17 01:42:33Z wollman $ 14f4228790SPeter Avalos */ 15f4228790SPeter Avalos 16f4228790SPeter Avalos #include <sys/types.h> 17f4228790SPeter Avalos #include <timeconv.h> 18f4228790SPeter Avalos 19f4228790SPeter Avalos /* 20f4228790SPeter Avalos * Convert a 32 bit representation of time_t into time_t. XXX needs to 21f4228790SPeter Avalos * implement the 50-year rule to handle post-2038 conversions. 22f4228790SPeter Avalos */ 23f4228790SPeter Avalos time_t 24f4228790SPeter Avalos _time32_to_time(__int32_t t32) 25f4228790SPeter Avalos { 26f4228790SPeter Avalos return((time_t)t32); 27f4228790SPeter Avalos } 28f4228790SPeter Avalos 29f4228790SPeter Avalos /* 30f4228790SPeter Avalos * Convert time_t to a 32 bit representation. If time_t is 64 bits we can 31f4228790SPeter Avalos * simply chop it down. The resulting 32 bit representation can be 32f4228790SPeter Avalos * converted back to a temporally local 64 bit time_t using time32_to_time. 33f4228790SPeter Avalos */ 34f4228790SPeter Avalos __int32_t 35f4228790SPeter Avalos _time_to_time32(time_t t) 36f4228790SPeter Avalos { 37f4228790SPeter Avalos return((__int32_t)t); 38f4228790SPeter Avalos } 39f4228790SPeter Avalos 40f4228790SPeter Avalos /* 41f4228790SPeter Avalos * Convert a 64 bit representation of time_t into time_t. If time_t is 42f4228790SPeter Avalos * represented as 32 bits we can simply chop it and not support times 43f4228790SPeter Avalos * past 2038. 44f4228790SPeter Avalos */ 45f4228790SPeter Avalos time_t 46f4228790SPeter Avalos _time64_to_time(__int64_t t64) 47f4228790SPeter Avalos { 48f4228790SPeter Avalos return((time_t)t64); 49f4228790SPeter Avalos } 50f4228790SPeter Avalos 51f4228790SPeter Avalos /* 52f4228790SPeter Avalos * Convert time_t to a 64 bit representation. If time_t is represented 53f4228790SPeter Avalos * as 32 bits we simply sign-extend and do not support times past 2038. 54f4228790SPeter Avalos */ 55f4228790SPeter Avalos __int64_t 56f4228790SPeter Avalos _time_to_time64(time_t t) 57f4228790SPeter Avalos { 58f4228790SPeter Avalos return((__int64_t)t); 59f4228790SPeter Avalos } 60f4228790SPeter Avalos 61f4228790SPeter Avalos /* 62f4228790SPeter Avalos * Convert to/from 'long'. Depending on the sizeof(long) this may or 63f4228790SPeter Avalos * may not require using the 50-year rule. 64f4228790SPeter Avalos */ 65f4228790SPeter Avalos long 66f4228790SPeter Avalos _time_to_long(time_t t) 67f4228790SPeter Avalos { 68f4228790SPeter Avalos if (sizeof(long) == sizeof(__int64_t)) 69f4228790SPeter Avalos return(_time_to_time64(t)); 70f4228790SPeter Avalos return((long)t); 71f4228790SPeter Avalos } 72f4228790SPeter Avalos 73f4228790SPeter Avalos time_t 74f4228790SPeter Avalos _long_to_time(long tlong) 75f4228790SPeter Avalos { 76f4228790SPeter Avalos if (sizeof(long) == sizeof(__int32_t)) 77f4228790SPeter Avalos return(_time32_to_time(tlong)); 78f4228790SPeter Avalos return((time_t)tlong); 79f4228790SPeter Avalos } 80f4228790SPeter Avalos 81f4228790SPeter Avalos /* 82f4228790SPeter Avalos * Convert to/from 'int'. Depending on the sizeof(int) this may or 83f4228790SPeter Avalos * may not require using the 50-year rule. 84f4228790SPeter Avalos */ 85f4228790SPeter Avalos int 86f4228790SPeter Avalos _time_to_int(time_t t) 87f4228790SPeter Avalos { 88f4228790SPeter Avalos if (sizeof(int) == sizeof(__int64_t)) 89f4228790SPeter Avalos return(_time_to_time64(t)); 90f4228790SPeter Avalos return((int)t); 91f4228790SPeter Avalos } 92f4228790SPeter Avalos 93f4228790SPeter Avalos time_t 94f4228790SPeter Avalos _int_to_time(int tint) 95f4228790SPeter Avalos { 96f4228790SPeter Avalos if (sizeof(int) == sizeof(__int32_t)) 97f4228790SPeter Avalos return(_time32_to_time(tint)); 98f4228790SPeter Avalos return((time_t)tint); 99f4228790SPeter Avalos } 100