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Annotation of 42BSD/lib/libc/gen/getlogin.c, revision 1.1.1.1

1.1       root        1: /*     getlogin.c      4.2     82/11/14        */
                      2: 
                      3: #include <utmp.h>
                      4: 
                      5: static char UTMP[]     = "/etc/utmp";
                      6: static struct utmp ubuf;
                      7: 
                      8: char *
                      9: getlogin()
                     10: {
                     11:        register int me, uf;
                     12:        register char *cp;
                     13: 
                     14:        if (!(me = ttyslot()))
                     15:                return(0);
                     16:        if ((uf = open(UTMP, 0)) < 0)
                     17:                return (0);
                     18:        lseek (uf, (long)(me*sizeof(ubuf)), 0);
                     19:        if (read(uf, (char *)&ubuf, sizeof (ubuf)) != sizeof (ubuf)) {
                     20:                close(uf);
                     21:                return (0);
                     22:        }
                     23:        close(uf);
                     24:        ubuf.ut_name[sizeof (ubuf.ut_name)] = ' ';
                     25:        for (cp = ubuf.ut_name; *cp++ != ' '; )
                     26:                ;
                     27:        *--cp = '\0';
                     28:        return (ubuf.ut_name);
                     29: }

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