projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 3e758ab9 MK |
1 | /* $Header: get_names.c 1.2 83/03/26 14:35:54 moore Exp $ */ |
| 2 | ||
| 3 | #include "talk.h" | |
| 4 | #include "ctl.h" | |
| 5 | ||
| 6 | char *getlogin(), *ttyname(), *rindex(); | |
| 7 | ||
| 8 | extern CTL_MSG msg; | |
| 9 | ||
| 10 | /* | |
| 11 | * Determine the local and remote user, tty, and machines | |
| 12 | */ | |
| 13 | ||
| 14 | struct hostent *gethostbyname(); | |
| 15 | ||
| 16 | get_names(argc, argv) | |
| 17 | int argc; | |
| 18 | char *argv[]; | |
| 19 | { | |
| 20 | char hostname[HOST_NAME_LENGTH]; | |
| 21 | char *his_name; | |
| 22 | char *my_name; | |
| 23 | char *my_machine_name; | |
| 24 | char *his_machine_name; | |
| 25 | char *my_tty; | |
| 26 | char *his_tty; | |
| 27 | char *ptr; | |
| 28 | int name_length; | |
| 29 | ||
| 30 | if (argc < 2 ) { | |
| 31 | printf("Usage: talk user [ttyname]\n"); | |
| 32 | exit(-1); | |
| 33 | } | |
| 34 | if ( !isatty(0) ) { | |
| 35 | printf("Standard input must be a tty, not a pipe or a file\n"); | |
| 36 | exit(-1); | |
| 37 | } | |
| 38 | ||
| 39 | my_name = getlogin(); | |
| 40 | if (my_name == NULL) { | |
| 41 | printf("You don't exist. Go away.\n"); | |
| 42 | exit(-1); | |
| 43 | } | |
| 44 | ||
| 45 | name_length = HOST_NAME_LENGTH; | |
| 46 | gethostname(hostname, &name_length); | |
| 47 | my_machine_name = hostname; | |
| 48 | ||
| 49 | my_tty = rindex(ttyname(0), '/') + 1; | |
| 50 | ||
| 51 | /* check for, and strip out, the machine name | |
| 52 | of the target */ | |
| 53 | ||
| 54 | for (ptr = argv[1]; *ptr != '\0' && | |
| 55 | *ptr != '@' && | |
| 56 | *ptr != ':' && | |
| 57 | *ptr != '!' && | |
| 58 | *ptr != '.' ; ptr++) { | |
| 59 | } | |
| 60 | ||
| 61 | if (*ptr == '\0') { | |
| 62 | ||
| 63 | /* this is a local to local talk */ | |
| 64 | ||
| 65 | his_name = argv[1]; | |
| 66 | his_machine_name = my_machine_name; | |
| 67 | ||
| 68 | } else { | |
| 69 | ||
| 70 | if (*ptr == '@') { | |
| 71 | /* user@host */ | |
| 72 | his_name = argv[1]; | |
| 73 | his_machine_name = ptr + 1; | |
| 74 | } else { | |
| 75 | /* host.user or host!user or host:user */ | |
| 76 | his_name = ptr + 1; | |
| 77 | his_machine_name = argv[1]; | |
| 78 | } | |
| 79 | *ptr = '\0'; | |
| 80 | } | |
| 81 | ||
| 82 | ||
| 83 | if (argc > 2) { | |
| 84 | his_tty = argv[2]; /* tty name is arg 2 */ | |
| 85 | } else { | |
| 86 | his_tty = (char *) 0; | |
| 87 | } | |
| 88 | ||
| 89 | get_addrs(my_machine_name, his_machine_name); | |
| 90 | ||
| 91 | /* Load these useful values into the standard message header */ | |
| 92 | ||
| 93 | msg.id_num = 0; | |
| 94 | ||
| 95 | strncpy(msg.l_name, my_name, NAME_SIZE); | |
| 96 | msg.l_name[NAME_SIZE - 1] = '\0'; | |
| 97 | ||
| 98 | strncpy(msg.r_name, his_name, NAME_SIZE); | |
| 99 | msg.r_name[NAME_SIZE - 1] = '\0'; | |
| 100 | ||
| 101 | strncpy(msg.r_tty, his_tty, TTY_SIZE); | |
| 102 | msg.r_tty[TTY_SIZE - 1] = '\0'; | |
| 103 | } |