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asctime.c revision 1.1.1.4 
      1 /*
      2 ** This file is in the public domain, so clarified as of
      3 ** 1996-06-05 by Arthur David Olson (arthur_david_olson (at) nih.gov).
      4 */
      5 
      6 #ifndef lint
      7 #ifndef NOID
      8 static char	elsieid[] = "@(#)asctime.c	7.9";
      9 #endif /* !defined NOID */
     10 #endif /* !defined lint */
     11 
     12 /*LINTLIBRARY*/
     13 
     14 #include "private.h"
     15 #include "tzfile.h"
     16 
     17 /*
     18 ** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, Second Edition, 1996-07-12.
     19 */
     20 
     21 char *
     22 asctime_r(timeptr, buf)
     23 register const struct tm *	timeptr;
     24 char *				buf;
     25 {
     26 	static const char	wday_name[][3] = {
     27 		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
     28 	};
     29 	static const char	mon_name[][3] = {
     30 		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
     31 		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
     32 	};
     33 	register const char *	wn;
     34 	register const char *	mn;
     35 
     36 	if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
     37 		wn = "???";
     38 	else	wn = wday_name[timeptr->tm_wday];
     39 	if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
     40 		mn = "???";
     41 	else	mn = mon_name[timeptr->tm_mon];
     42 	/*
     43 	** The X3J11-suggested format is
     44 	**	"%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
     45 	** Since the .2 in 02.2d is ignored, we drop it.
     46 	*/
     47 	(void) sprintf(buf, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
     48 		wn, mn,
     49 		timeptr->tm_mday, timeptr->tm_hour,
     50 		timeptr->tm_min, timeptr->tm_sec,
     51 		TM_YEAR_BASE + timeptr->tm_year);
     52 	return buf;
     53 }
     54 
     55 /*
     56 ** A la X3J11, with core dump avoidance.
     57 */
     58 
     59 char *
     60 asctime(timeptr)
     61 register const struct tm *	timeptr;
     62 {
     63 	/*
     64 	** Big enough for something such as
     65 	** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
     66 	** (two three-character abbreviations, five strings denoting integers,
     67 	** three explicit spaces, two explicit colons, a newline,
     68 	** and a trailing ASCII nul).
     69 	*/
     70 	static char		result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
     71 					3 + 2 + 1 + 1];
     72 
     73 	return asctime_r(timeptr, result);
     74 }
     75