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asctime.c revision 1.2 
      1 /*	$NetBSD: asctime.c,v 1.2 1995/03/09 23:41:11 jtc Exp $	*/
      2 
      3 #ifndef lint
      4 #ifndef NOID
      5 static char	elsieid[] = "@(#)asctime.c	7.6";
      6 #endif /* !defined NOID */
      7 #endif /* !defined lint */
      8 
      9 /*LINTLIBRARY*/
     10 
     11 #include "private.h"
     12 #include "tzfile.h"
     13 
     14 /*
     15 ** A la X3J11, with core dump avoidance.
     16 */
     17 
     18 char *
     19 asctime(timeptr)
     20 register const struct tm *	timeptr;
     21 {
     22 	static const char	wday_name[][3] = {
     23 		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
     24 	};
     25 	static const char	mon_name[][3] = {
     26 		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
     27 		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
     28 	};
     29 	/*
     30 	** Big enough for something such as
     31 	** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
     32 	** (two three-character abbreviations, five strings denoting integers,
     33 	** three explicit spaces, two explicit colons, a newline,
     34 	** and a trailing ASCII nul).
     35 	*/
     36 	static char		result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
     37 					3 + 2 + 1 + 1];
     38 	register const char *	wn;
     39 	register const char *	mn;
     40 
     41 	if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
     42 		wn = "???";
     43 	else	wn = wday_name[timeptr->tm_wday];
     44 	if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
     45 		mn = "???";
     46 	else	mn = mon_name[timeptr->tm_mon];
     47 	/*
     48 	** The X3J11-suggested format is
     49 	**	"%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
     50 	** Since the .2 in 02.2d is ignored, we drop it.
     51 	*/
     52 	(void) sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
     53 		wn, mn,
     54 		timeptr->tm_mday, timeptr->tm_hour,
     55 		timeptr->tm_min, timeptr->tm_sec,
     56 		TM_YEAR_BASE + timeptr->tm_year);
     57 	return result;
     58 }
     59