usr/src/lib/libc/gen/getlogin.c

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getlogin.c	5.3 (Berkeley) %G%";
#endif LIBC_SCCS and not lint

#include <utmp.h>

static	char UTMP[]	= "/etc/utmp";
static	struct utmp ubuf;

char *
getlogin()
{
	register int me, uf;
	register char *cp;

	if (!(me = ttyslot()))
		return(0);
	if ((uf = open(UTMP, 0)) < 0)
		return (0);
	lseek (uf, (long)(me*sizeof(ubuf)), 0);
	if (read(uf, (char *)&ubuf, sizeof (ubuf)) != sizeof (ubuf)) {
		close(uf);
		return (0);
	}
	close(uf);
	if (ubuf.ut_name[0] == '\0')
		return (0);
	ubuf.ut_name[sizeof (ubuf.ut_name)] = ' ';
	for (cp = ubuf.ut_name; *cp++ != ' '; )
		;
	*--cp = '\0';
	return (ubuf.ut_name);
}
Commit	Line	Data
	1	#if defined(LIBC_SCCS) && !defined(lint)
	2	static char sccsid[] = "@(#)getlogin.c 5.3 (Berkeley) %G%";
	3	#endif LIBC_SCCS and not lint
	4
	5	#include <utmp.h>
	6
	7	static char UTMP[] = "/etc/utmp";
	8	static struct utmp ubuf;
	9
	10	char *
	11	getlogin()
	12	{
	13	register int me, uf;
	14	register char *cp;
	15
	16	if (!(me = ttyslot()))
	17	return(0);
	18	if ((uf = open(UTMP, 0)) < 0)
	19	return (0);
	20	lseek (uf, (long)(me*sizeof(ubuf)), 0);
	21	if (read(uf, (char *)&ubuf, sizeof (ubuf)) != sizeof (ubuf)) {
	22	close(uf);
	23	return (0);
	24	}
	25	close(uf);
	26	if (ubuf.ut_name[0] == '\0')
	27	return (0);
	28	ubuf.ut_name[sizeof (ubuf.ut_name)] = ' ';
	29	for (cp = ubuf.ut_name; *cp++ != ' '; )
	30	;
	31	*--cp = '\0';
	32	return (ubuf.ut_name);
	33	}