asctime.c revision 71579 
1300829Sgrehan/*
2300829Sgrehan** This file is in the public domain, so clarified as of
3300829Sgrehan** June 5, 1996 by Arthur David Olson (arthur_david_olson@nih.gov).
4300829Sgrehan*
5300829Sgrehan* $FreeBSD: head/lib/libc/stdtime/asctime.c 71579 2001-01-24 13:01:12Z deischen $
6300829Sgrehan*/
7300829Sgrehan
8300829Sgrehan#ifndef lint
9300829Sgrehan#ifndef NOID
10300829Sgrehanstatic char	elsieid[] = "@(#)asctime.c	7.7";
11300829Sgrehan#endif /* !defined NOID */
12300829Sgrehan#endif /* !defined lint */
13300829Sgrehan
14300829Sgrehan/*LINTLIBRARY*/
15300829Sgrehan
16300829Sgrehan#include "namespace.h"
17300829Sgrehan#include "private.h"
18300829Sgrehan#include "un-namespace.h"
19300829Sgrehan#include "tzfile.h"
20300829Sgrehan
21300829Sgrehan/*
22300829Sgrehan** A la X3J11, with core dump avoidance.
23300829Sgrehan*/
24300829Sgrehan
25300829Sgrehan
26300829Sgrehanchar *
27300829Sgrehanasctime(timeptr)
28300829Sgrehanconst struct tm *	timeptr;
29300829Sgrehan{
30300829Sgrehan	static char		result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
31300829Sgrehan					3 + 2 + 1 + 1];
32300829Sgrehan	return(asctime_r(timeptr, result));
33300829Sgrehan}
34300829Sgrehan
35300829Sgrehanchar *
36300829Sgrehanasctime_r(timeptr, result)
37300829Sgrehanconst struct tm *	timeptr;
38300829Sgrehanchar *result;
39{
40	static const char	wday_name[][3] = {
41		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
42	};
43	static const char	mon_name[][3] = {
44		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
45		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
46	};
47	/*
48	** Big enough for something such as
49	** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
50	** (two three-character abbreviations, five strings denoting integers,
51	** three explicit spaces, two explicit colons, a newline,
52	** and a trailing ASCII nul).
53	*/
54	register const char *	wn;
55	register const char *	mn;
56
57	if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
58		wn = "???";
59	else	wn = wday_name[timeptr->tm_wday];
60	if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
61		mn = "???";
62	else	mn = mon_name[timeptr->tm_mon];
63	/*
64	** The X3J11-suggested format is
65	**	"%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
66	** Since the .2 in 02.2d is ignored, we drop it.
67	*/
68	(void) sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
69		wn, mn,
70		timeptr->tm_mday, timeptr->tm_hour,
71		timeptr->tm_min, timeptr->tm_sec,
72		TM_YEAR_BASE + timeptr->tm_year);
73	return result;
74}
75