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asctime.c revision 1.6 
      1 /*	$NetBSD: asctime.c,v 1.6 1997/07/13 20:26:47 christos Exp $	*/
      2 
      3 /*
      4 ** This file is in the public domain, so clarified as of
      5 ** 1996-06-05 by Arthur David Olson (arthur_david_olson (at) nih.gov).
      6 */
      7 
      8 #include <sys/cdefs.h>
      9 #ifndef lint
     10 #ifndef NOID
     11 #if 0
     12 static char	elsieid[] = "@(#)asctime.c	7.8";
     13 #else
     14 __RCSID("$NetBSD: asctime.c,v 1.6 1997/07/13 20:26:47 christos Exp $");
     15 #endif
     16 #endif /* !defined NOID */
     17 #endif /* !defined lint */
     18 
     19 /*LINTLIBRARY*/
     20 
     21 #include "private.h"
     22 #include "tzfile.h"
     23 
     24 /*
     25 ** A la X3J11, with core dump avoidance.
     26 */
     27 
     28 char *
     29 asctime(timeptr)
     30 register const struct tm *	timeptr;
     31 {
     32 	static const char	wday_name[][3] = {
     33 		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
     34 	};
     35 	static const char	mon_name[][3] = {
     36 		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
     37 		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
     38 	};
     39 	/*
     40 	** Big enough for something such as
     41 	** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
     42 	** (two three-character abbreviations, five strings denoting integers,
     43 	** three explicit spaces, two explicit colons, a newline,
     44 	** and a trailing ASCII nul).
     45 	*/
     46 	static char		result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
     47 					3 + 2 + 1 + 1];
     48 	register const char *	wn;
     49 	register const char *	mn;
     50 
     51 	if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
     52 		wn = "???";
     53 	else	wn = wday_name[timeptr->tm_wday];
     54 	if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
     55 		mn = "???";
     56 	else	mn = mon_name[timeptr->tm_mon];
     57 	/*
     58 	** The X3J11-suggested format is
     59 	**	"%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
     60 	** Since the .2 in 02.2d is ignored, we drop it.
     61 	*/
     62 	(void)snprintf(result, sizeof result,"%.3s %.3s%3d %02d:%02d:%02d %d\n",
     63 		wn, mn,
     64 		timeptr->tm_mday, timeptr->tm_hour,
     65 		timeptr->tm_min, timeptr->tm_sec,
     66 		TM_YEAR_BASE + timeptr->tm_year);
     67 	return result;
     68 }
     69