asctime.c revision 130461 
1/*
2** This file is in the public domain, so clarified as of
3** 1996-06-05 by Arthur David Olson (arthur_david_olson@nih.gov).
4*/
5
6#include <sys/cdefs.h>
7#ifndef lint
8#ifndef NOID
9static char	elsieid[] __unused = "@(#)asctime.c	7.9";
10#endif /* !defined NOID */
11#endif /* !defined lint */
12__FBSDID("$FreeBSD: head/lib/libc/stdtime/asctime.c 130461 2004-06-14 10:31:52Z stefanf $");
13
14/*LINTLIBRARY*/
15
16#include "namespace.h"
17#include "private.h"
18#include "un-namespace.h"
19#include "tzfile.h"
20
21/*
22** A la ISO/IEC 9945-1, ANSI/IEEE Std 1003.1, Second Edition, 1996-07-12.
23*/
24
25char *
26asctime_r(timeptr, buf)
27const struct tm *	timeptr;
28char *			buf;
29{
30	static const char	wday_name[][3] = {
31		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
32	};
33	static const char	mon_name[][3] = {
34		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
35		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
36	};
37	const char *	wn;
38	const char *	mn;
39
40	if (timeptr->tm_wday < 0 || timeptr->tm_wday >= DAYSPERWEEK)
41		wn = "???";
42	else	wn = wday_name[timeptr->tm_wday];
43	if (timeptr->tm_mon < 0 || timeptr->tm_mon >= MONSPERYEAR)
44		mn = "???";
45	else	mn = mon_name[timeptr->tm_mon];
46	/*
47	** The X3J11-suggested format is
48	**	"%.3s %.3s%3d %02.2d:%02.2d:%02.2d %d\n"
49	** Since the .2 in 02.2d is ignored, we drop it.
50	*/
51	(void) sprintf(buf, "%.3s %.3s%3d %02d:%02d:%02d %d\n",
52		wn, mn,
53		timeptr->tm_mday, timeptr->tm_hour,
54		timeptr->tm_min, timeptr->tm_sec,
55		TM_YEAR_BASE + timeptr->tm_year);
56	return buf;
57}
58
59/*
60** A la X3J11, with core dump avoidance.
61*/
62
63char *
64asctime(timeptr)
65const struct tm *	timeptr;
66{
67	/*
68	** Big enough for something such as
69	** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
70	** (two three-character abbreviations, five strings denoting integers,
71	** three explicit spaces, two explicit colons, a newline,
72	** and a trailing ASCII nul).
73	*/
74	static char		result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
75					3 + 2 + 1 + 1];
76
77	return asctime_r(timeptr, result);
78}
79