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Annotation of researchv9/libc/gen/ttyslot.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Return the number of the slot in the utmp file
                      3:  * corresponding to the current user.
                      4:  * Definition is the line number in the /etc/ttys file.
                      5:  */
                      6: 
                      7: char   *cttyname();
                      8: char   *strcpy();
                      9: char   *getttys();
                     10: 
                     11: ttyslot()
                     12: {
                     13:        register char *cp, *tp;
                     14:        register int s, tf;
                     15: 
                     16:        if ((cp = cttyname()) == 0)
                     17:                return(0);
                     18:        if (strncmp(cp, "/dev/", 5) == 0)
                     19:                cp += 5;
                     20:        if ((tf=open("/etc/ttys", 0)) < 0)
                     21:                return(0);
                     22:        s = 0;
                     23:        while (tp = getttys(tf)) {
                     24:                s++;
                     25:                if (strcmp(cp, tp)==0) {
                     26:                        close(tf);
                     27:                        return(s);
                     28:                }
                     29:        }
                     30:        close(tf);
                     31:        return(0);
                     32: }
                     33: 
                     34: static char *
                     35: getttys(f)
                     36: {
                     37:        static char line[32];
                     38:        register char *lp;
                     39: 
                     40:        lp = line;
                     41:        for (;;) {
                     42:                if (read(f, lp, 1) != 1)
                     43:                        return(0);
                     44:                if (*lp =='\n') {
                     45:                        *lp = '\0';
                     46:                        return(line+2);
                     47:                }
                     48:                if (lp >= &line[32])
                     49:                        return(line+2);
                     50:                lp++;
                     51:        }
                     52: }

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