projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 4b9ccde7 | 1 | /* @(#)ttyslot.c 4.1 (Berkeley) 12/21/80 */ |
| 9c8fc5ca BJ |
2 | /* |
| 3 | * Return the number of the slot in the utmp file | |
| 4 | * corresponding to the current user: try for file 0, 1, 2. | |
| 5 | * Definition is the line number in the /etc/ttys file. | |
| 6 | */ | |
| 7 | ||
| 8 | ||
| 9 | char *ttyname(); | |
| 10 | char *getttys(); | |
| 11 | char *rindex(); | |
| 12 | static char ttys[] = "/etc/ttys"; | |
| 13 | ||
| 14 | #define NULL 0 | |
| 15 | ||
| 16 | ttyslot() | |
| 17 | { | |
| 18 | register char *tp, *p; | |
| 19 | register s, tf; | |
| 20 | ||
| 21 | if ((tp=ttyname(0))==NULL && (tp=ttyname(1))==NULL && (tp=ttyname(2))==NULL) | |
| 22 | return(0); | |
| 23 | if ((p = rindex(tp, '/')) == NULL) | |
| 24 | p = tp; | |
| 25 | else | |
| 26 | p++; | |
| 27 | if ((tf=open(ttys, 0)) < 0) | |
| 28 | return(0); | |
| 29 | s = 0; | |
| 30 | while (tp = getttys(tf)) { | |
| 31 | s++; | |
| 32 | if (strcmp(p, tp)==0) { | |
| 33 | close(tf); | |
| 34 | return(s); | |
| 35 | } | |
| 36 | } | |
| 37 | close(tf); | |
| 38 | return(0); | |
| 39 | } | |
| 40 | ||
| 41 | static char * | |
| 42 | getttys(f) | |
| 43 | { | |
| 44 | static char line[32]; | |
| 45 | register char *lp; | |
| 46 | ||
| 47 | lp = line; | |
| 48 | for (;;) { | |
| 49 | if (read(f, lp, 1) != 1) | |
| 50 | return(NULL); | |
| 51 | if (*lp =='\n') { | |
| 52 | *lp = '\0'; | |
| 53 | return(line+2); | |
| 54 | } | |
| 55 | if (lp >= &line[32]) | |
| 56 | return(line+2); | |
| 57 | lp++; | |
| 58 | } | |
| 59 | } |