asctime.c revision 2708 
1#ifndef lint
2#ifndef NOID
3static char	elsieid[] = "@(#)asctime.c	7.5";
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
16char *
17asctime(timeptr)
18register 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