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asctime.c revision 1.1 
      1 #ifndef lint
      2 #ifndef NOID
      3 static char	elsieid[] = "@(#)asctime.c	7.6";
      4 #endif /* !defined NOID */
      5 #endif /* !defined lint */
      6 
      7 /*LINTLIBRARY*/
      8 
      9 #include "private.h"
     10 #include "tzfile.h"
     11 
     12 /*
     13 ** A la X3J11, with core dump avoidance.
     14 */
     15 
     16 char *
     17 asctime(timeptr)
     18 register const struct tm *	timeptr;
     19 {
     20 	static const char	wday_name[][3] = {
     21 		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
     22 	};
     23 	static const char	mon_name[][3] = {
     24 		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
     25 		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
     26 	};
     27 	/*
     28 	** Big enough for something such as
     29 	** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
     30 	** (two three-character abbreviations, five strings denoting integers,
     31 	** three explicit spaces, two explicit colons, a newline,
     32 	** and a trailing ASCII nul).
     33 	*/
     34 	static char		result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
     35 					3 + 2 + 1 + 1];
     36 	register const char *	wn;
     37 	register const char *	mn;
     38 
     39 	if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
     40 		wn = "???";
     41 	else	wn = wday_name[timeptr->tm_wday];
     42 	if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
     43 		mn = "???";
     44 	else	mn = mon_name[timeptr->tm_mon];
     45 	/*
     46 	** The X3J11-suggested format is
     47 	**	"%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
     48 	** Since the .2 in 02.2d is ignored, we drop it.
     49 	*/
     50 	(void) sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
     51 		wn, mn,
     52 		timeptr->tm_mday, timeptr->tm_hour,
     53 		timeptr->tm_min, timeptr->tm_sec,
     54 		TM_YEAR_BASE + timeptr->tm_year);
     55 	return result;
     56 }
     57