projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 9c8fc5ca BJ |
1 | /* |
| 2 | * Return the number of the slot in the utmp file | |
| 3 | * corresponding to the current user: try for file 0, 1, 2. | |
| 4 | * Definition is the line number in the /etc/ttys file. | |
| 5 | */ | |
| 6 | ||
| 7 | ||
| 8 | char *ttyname(); | |
| 9 | char *getttys(); | |
| 10 | char *rindex(); | |
| 11 | static char ttys[] = "/etc/ttys"; | |
| 12 | ||
| 13 | #define NULL 0 | |
| 14 | ||
| 15 | ttyslot() | |
| 16 | { | |
| 17 | register char *tp, *p; | |
| 18 | register s, tf; | |
| 19 | ||
| 20 | if ((tp=ttyname(0))==NULL && (tp=ttyname(1))==NULL && (tp=ttyname(2))==NULL) | |
| 21 | return(0); | |
| 22 | if ((p = rindex(tp, '/')) == NULL) | |
| 23 | p = tp; | |
| 24 | else | |
| 25 | p++; | |
| 26 | if ((tf=open(ttys, 0)) < 0) | |
| 27 | return(0); | |
| 28 | s = 0; | |
| 29 | while (tp = getttys(tf)) { | |
| 30 | s++; | |
| 31 | if (strcmp(p, tp)==0) { | |
| 32 | close(tf); | |
| 33 | return(s); | |
| 34 | } | |
| 35 | } | |
| 36 | close(tf); | |
| 37 | return(0); | |
| 38 | } | |
| 39 | ||
| 40 | static char * | |
| 41 | getttys(f) | |
| 42 | { | |
| 43 | static char line[32]; | |
| 44 | register char *lp; | |
| 45 | ||
| 46 | lp = line; | |
| 47 | for (;;) { | |
| 48 | if (read(f, lp, 1) != 1) | |
| 49 | return(NULL); | |
| 50 | if (*lp =='\n') { | |
| 51 | *lp = '\0'; | |
| 52 | return(line+2); | |
| 53 | } | |
| 54 | if (lp >= &line[32]) | |
| 55 | return(line+2); | |
| 56 | lp++; | |
| 57 | } | |
| 58 | } |