asctime.c

来自「操作系统SunOS 4.1.3版本的源码」· C语言 代码 · 共 56 行

#if !defined(lint) && defined(SCCSIDS)
static	char sccsid[] = "@(#)asctime.c 1.1 92/07/30 SMI";
#endif

/*LINTLIBRARY*/

#include <time.h>
#include <tzfile.h>

static	char	cbuf[26];

char		*ct_numb();

char *
asctime(t)
struct tm *t;
{
	register char *cp, *ncp;
	register int *tp;

	cp = cbuf;
	for (ncp = "Day Mon 00 00:00:00 1900\n"; *cp++ = *ncp++;);
	ncp = &"SunMonTueWedThuFriSat"[3*t->tm_wday];
	cp = cbuf;
	*cp++ = *ncp++;
	*cp++ = *ncp++;
	*cp++ = *ncp++;
	cp++;
	tp = &t->tm_mon;
	ncp = &"JanFebMarAprMayJunJulAugSepOctNovDec"[(*tp)*3];
	*cp++ = *ncp++;
	*cp++ = *ncp++;
	*cp++ = *ncp++;
	cp = ct_numb(cp, *--tp);
	cp = ct_numb(cp, *--tp+100);
	cp = ct_numb(cp, *--tp+100);
	cp = ct_numb(cp, *--tp+100);
	cp = ct_numb(cp, (t->tm_year + TM_YEAR_BASE)/100);
	cp--;
	cp = ct_numb(cp, t->tm_year+100);
	return(cbuf);
}

static char *
ct_numb(cp, n)
register char *cp;
{
	cp++;
	if (n>=10)
		*cp++ = (n/10)%10 + '0';
	else
		*cp++ = ' ';
	*cp++ = n%10 + '0';
	return(cp);
}