1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 /* 31 * This routine converts time as follows. 32 * The epoch is 0000 Jan 1 1970 GMT. 33 * The argument time is in seconds since then. 34 * The localtime(t) entry returns a pointer to an array 35 * containing 36 * seconds (0-59) 37 * minutes (0-59) 38 * hours (0-23) 39 * day of month (1-31) 40 * month (0-11) 41 * year-1970 42 * weekday (0-6, Sun is 0) 43 * day of the year 44 * daylight savings flag 45 * 46 * The routine corrects for daylight saving 47 * time and will work in any time zone provided 48 * "timezone" is adjusted to the difference between 49 * Greenwich and local standard time (measured in seconds). 50 * In places like Michigan "daylight" must 51 * be initialized to 0 to prevent the conversion 52 * to daylight time. 53 * There is a table which accounts for the peculiarities 54 * undergone by daylight time in 1974-1975. 55 * 56 * The routine does not work 57 * in Saudi Arabia which runs on Solar time. 58 * 59 * asctime(tvec) 60 * where tvec is produced by localtime 61 * returns a ptr to a character string 62 * that has the ascii time in the form 63 * Thu Jan 01 00:00:00 1970\n\0 64 * 01234567890123456789012345 65 * 0 1 2 66 * 67 * ctime(t) just calls localtime, then asctime. 68 * 69 * tzset() looks for an environment variable named 70 * TZ. 71 * If the variable is present, it will set the external 72 * variables "timezone", "altzone", "daylight", and "tzname" 73 * appropriately. It is called by localtime, and 74 * may also be called explicitly by the user. 75 */ 76 77 #include "lint.h" 78 #include <time.h> 79 #include <sys/types.h> 80 #include <errno.h> 81 #include <thread.h> 82 #include <synch.h> 83 #include <mtlib.h> 84 #include "libc.h" 85 86 87 /* 88 * POSIX.1c Draft-6 version of the function ctime_r. 89 * It was implemented by Solaris 2.3. 90 */ 91 char * 92 ctime_r(const time_t *t, char *buffer, int buflen) 93 { 94 struct tm res; 95 96 if (localtime_r(t, &res) == NULL) 97 return (NULL); 98 99 if (asctime_r(&res, buffer, buflen) == NULL) 100 return (NULL); 101 102 return (buffer); 103 } 104 105 /* 106 * POSIX.1c standard version of the function ctime_r. 107 * User gets it via static ctime_r from the header file. 108 */ 109 char * 110 __posix_ctime_r(const time_t *t, char *buffer) 111 { 112 struct tm res; 113 114 if (localtime_r(t, &res) == NULL) 115 return (NULL); 116 117 if (__posix_asctime_r(&res, buffer) == NULL) 118 return (NULL); 119 120 return (buffer); 121 } 122