asctime.c revision 35436 
1/*
2** This file is in the public domain, so clarified as of
3** June 5, 1996 by Arthur David Olson (arthur_david_olson@nih.gov).
4*/
5
6#ifndef lint
7#ifndef NOID
8static char	elsieid[] = "@(#)asctime.c	7.7";
9#endif /* !defined NOID */
10#endif /* !defined lint */
11
12/*LINTLIBRARY*/
13
14#include "private.h"
15#include "tzfile.h"
16
17#ifndef _THREAD_SAFE
18static char *asctime_r __P((const struct tm *, char *));
19#endif
20
21/*
22** A la X3J11, with core dump avoidance.
23*/
24
25
26char *
27asctime(timeptr)
28const struct tm *	timeptr;
29{
30	static char		result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
31					3 + 2 + 1 + 1];
32	return(asctime_r(timeptr, result));
33}
34
35#ifndef _THREAD_SAFE
36static
37#endif
38char *
39asctime_r(timeptr, result)
40const struct tm *	timeptr;
41char *result;
42{
43	static const char	wday_name[][3] = {
44		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
45	};
46	static const char	mon_name[][3] = {
47		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
48		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
49	};
50	/*
51	** Big enough for something such as
52	** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
53	** (two three-character abbreviations, five strings denoting integers,
54	** three explicit spaces, two explicit colons, a newline,
55	** and a trailing ASCII nul).
56	*/
57	register const char *	wn;
58	register const char *	mn;
59
60	if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
61		wn = "???";
62	else	wn = wday_name[timeptr->tm_wday];
63	if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
64		mn = "???";
65	else	mn = mon_name[timeptr->tm_mon];
66	/*
67	** The X3J11-suggested format is
68	**	"%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
69	** Since the .2 in 02.2d is ignored, we drop it.
70	*/
71	(void) sprintf(result, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
72		wn, mn,
73		timeptr->tm_mday, timeptr->tm_hour,
74		timeptr->tm_min, timeptr->tm_sec,
75		TM_YEAR_BASE + timeptr->tm_year);
76	return result;
77}
78