uclibc-ng/libc/misc/time/asc_conv.c

#include <time.h>
#include <string.h>
/*
 * Internal ascii conversion routine, avoid use of printf, it's a bit big!
 */


static void hit(buf, val)
char *buf;
int val;
{
	*buf = '0' + val % 10;
}

void __asctime(buffer, ptm)
register char *buffer;
struct tm *ptm;
{
	static char days[] = "SunMonTueWedThuFriSat";
	static char mons[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
	int year;

	/*              012345678901234567890123456 */
	strcpy(buffer, "Err Err .. ..:..:.. ....\n");
	if ((ptm->tm_wday >= 0) && (ptm->tm_wday <= 6))
		memcpy(buffer, days + 3 * (ptm->tm_wday), 3);

	if ((ptm->tm_mon >= 0) && (ptm->tm_mon <= 11))
		memcpy(buffer + 4, mons + 3 * (ptm->tm_mon), 3);


	hit(buffer + 8, ptm->tm_mday / 10);
	hit(buffer + 9, ptm->tm_mday);
	hit(buffer + 11, ptm->tm_hour / 10);
	hit(buffer + 12, ptm->tm_hour);
	hit(buffer + 14, ptm->tm_min / 10);
	hit(buffer + 15, ptm->tm_min);
	hit(buffer + 17, ptm->tm_sec / 10);
	hit(buffer + 18, ptm->tm_sec);

	year = ptm->tm_year + 1900;
	hit(buffer + 20, year / 1000);
	hit(buffer + 21, year / 100);
	hit(buffer + 22, year / 10);
	hit(buffer + 23, year);
}