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      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 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 /*
     33  * This routine converts time as follows.  The epoch is 0000  Jan  1
     34  * 1970  GMT.   The  argument  time  is  in seconds since then.  The
     35  * localtime(t) entry returns a pointer to an array containing:
     36  *
     37  *		  seconds (0-59)
     38  *		  minutes (0-59)
     39  *		  hours (0-23)
     40  *		  day of month (1-31)
     41  *		  month (0-11)
     42  *		  year
     43  *		  weekday (0-6, Sun is 0)
     44  *		  day of the year
     45  *		  daylight savings flag
     46  *
     47  * The routine corrects for daylight saving time and  will  work  in
     48  * any  time  zone provided "timezone" is adjusted to the difference
     49  * between Greenwich and local standard time (measured in seconds).
     50  *
     51  *	 ascftime(buf, format, t)	-> where t is produced by localtime
     52  *				           and returns a ptr to a character
     53  *				           string that has the ascii time in
     54  *				           the format specified by the format
     55  *				           argument (see date(1) for format
     56  *				           syntax).
     57  *
     58  *	 cftime(buf, format, t) 	-> just calls ascftime.
     59  *
     60  *
     61  *
     62  */
     63 
     64 #include	"lint.h"
     65 #include	<mtlib.h>
     66 #include	<stddef.h>
     67 #include	<time.h>
     68 #include	<limits.h>
     69 #include	<stdlib.h>
     70 #include	<thread.h>
     71 #include	<synch.h>
     72 
     73 int
     74 cftime(char *buf, char *format, const time_t *t)
     75 {
     76 	struct tm res;
     77 	struct tm *p;
     78 
     79 	p = localtime_r(t, &res);
     80 	if (p == NULL) {
     81 		*buf = '\0';
     82 		return (0);
     83 	}
     84 	/* LINTED do not use ascftime() */
     85 	return (ascftime(buf, format, p));
     86 }
     87 
     88 int
     89 ascftime(char *buf, const char *format, const struct tm *tm)
     90 {
     91 	/* Set format string, if not already set */
     92 	if (format == NULL || *format == '\0')
     93 		if (((format = getenv("CFTIME")) == 0) || *format == 0)
     94 			format =  "%C";
     95 
     96 	return ((int)strftime(buf, LONG_MAX, format, tm));
     97 }
     98