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1.1 ! root 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: }
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