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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* Copyright (c) 1988 AT&T */ 30 /* All Rights Reserved */ 31 32 33 /* 34 * This routine converts time as follows. 35 * The epoch is 0000 Jan 1 1970 GMT. 36 * The argument time is in seconds since then. 37 * The localtime(t) entry returns a pointer to an array 38 * containing 39 * seconds (0-59) 40 * minutes (0-59) 41 * hours (0-23) 42 * day of month (1-31) 43 * month (0-11) 44 * year-1970 45 * weekday (0-6, Sun is 0) 46 * day of the year 47 * daylight savings flag 48 * 49 * The routine corrects for daylight saving 50 * time and will work in any time zone provided 51 * "timezone" is adjusted to the difference between 52 * Greenwich and local standard time (measured in seconds). 53 * In places like Michigan "daylight" must 54 * be initialized to 0 to prevent the conversion 55 * to daylight time. 56 * There is a table which accounts for the peculiarities 57 * undergone by daylight time in 1974-1975. 58 * 59 * The routine does not work 60 * in Saudi Arabia which runs on Solar time. 61 * 62 * asctime(tvec) 63 * where tvec is produced by localtime 64 * returns a ptr to a character string 65 * that has the ascii time in the form 66 * Thu Jan 01 00:00:00 1970\n\0 67 * 01234567890123456789012345 68 * 0 1 2 69 * 70 * ctime(t) just calls localtime, then asctime. 71 * 72 * tzset() looks for an environment variable named 73 * TZ. 74 * If the variable is present, it will set the external 75 * variables "timezone", "altzone", "daylight", and "tzname" 76 * appropriately. It is called by localtime, and 77 * may also be called explicitly by the user. 78 */ 79 80 #pragma weak ctime_r = _ctime_r 81 82 #include "synonyms.h" 83 #include <time.h> 84 #include <sys/types.h> 85 #include <errno.h> 86 #include <thread.h> 87 #include <synch.h> 88 #include <mtlib.h> 89 #include "libc.h" 90 91 92 /* 93 * POSIX.1c Draft-6 version of the function ctime_r. 94 * It was implemented by Solaris 2.3. 95 */ 96 char * 97 ctime_r(const time_t *t, char *buffer, int buflen) 98 { 99 struct tm res; 100 101 if (localtime_r(t, &res) == NULL) 102 return (NULL); 103 104 if (asctime_r(&res, buffer, buflen) == NULL) 105 return (NULL); 106 107 return (buffer); 108 } 109 110 /* 111 * POSIX.1c standard version of the function ctime_r. 112 * User gets it via static ctime_r from the header file. 113 */ 114 char * 115 __posix_ctime_r(const time_t *t, char *buffer) 116 { 117 struct tm res; 118 119 if (localtime_r(t, &res) == NULL) 120 return (NULL); 121 122 if (__posix_asctime_r(&res, buffer) == NULL) 123 return (NULL); 124 125 return (buffer); 126 } 127