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Annotation of 43BSD/lib/libc/gen/getlogin.c, revision 1.1

1.1     ! root        1: #if defined(LIBC_SCCS) && !defined(lint)
        !             2: static char sccsid[] = "@(#)getlogin.c 5.3 (Berkeley) 5/9/86";
        !             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: }

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