asctime.c revision 15927 
1
2#ifndef lint
3#ifndef NOID
4static char	elsieid[] = "@(#)asctime.c	7.5";
5#endif /* !defined NOID */
6#endif /* !defined lint */
7
8/*LINTLIBRARY*/
9
10#include "private.h"
11#include "tzfile.h"
12
13/*
14** A la X3J11, with core dump avoidance.
15*/
16
17char *
18asctime(timeptr)
19register const struct tm *	timeptr;
20{
21	static const char	wday_name[][3] = {
22		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
23	};
24	static const char	mon_name[][3] = {
25		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
26		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
27	};
28	/*
29	** Big enough for something such as
30	** ??? ???-2147483648 -2147483648:-2147483648:-2147483648 -2147483648\n
31	** (two three-character abbreviations, five strings denoting integers,
32	** three explicit spaces, two explicit colons, a newline,
33	** and a trailing ASCII nul).
34	*/
35	static char		result[3 * 2 + 5 * INT_STRLEN_MAXIMUM(int) +
36					3 + 2 + 1 + 1];
37	register const char *	wn;
38	register 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(result, "%.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 result;
57}
58