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Annotation of 43BSD/old/talk/get_names.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)get_names.c        5.1 (Berkeley) 6/6/85";
        !             9: #endif not lint
        !            10: 
        !            11: #include "talk.h"
        !            12: #include "ctl.h"
        !            13: 
        !            14: char *getlogin(), *ttyname(), *rindex();
        !            15: 
        !            16: extern CTL_MSG msg;
        !            17: 
        !            18: struct hostent *gethostbyname();
        !            19: 
        !            20: /*
        !            21:  * Determine the local and remote user, tty, and machines
        !            22:  */
        !            23: get_names(argc, argv)
        !            24:        int argc;
        !            25:        char *argv[];
        !            26: {
        !            27:        char hostname[HOST_NAME_LENGTH];
        !            28:        char *his_name;
        !            29:        char *my_name;
        !            30:        char *my_machine_name;
        !            31:        char *his_machine_name;
        !            32:        char *my_tty;
        !            33:        char *his_tty;
        !            34:        char *ptr;
        !            35: 
        !            36:        if (argc < 2 ) {
        !            37:                printf("Usage:  talk user [ttyname]\n");
        !            38:                exit(-1);
        !            39:        }
        !            40:        if (!isatty(0)) {
        !            41:                printf("Standard input must be a tty, not a pipe or a file\n");
        !            42:                exit(-1);
        !            43:        }
        !            44:        my_name = getlogin();
        !            45:        if (my_name == NULL) {
        !            46:                printf("You don't exist. Go away.\n");
        !            47:                exit(-1);
        !            48:        }
        !            49:        gethostname(hostname, sizeof (hostname));
        !            50:        my_machine_name = hostname;
        !            51:        my_tty = rindex(ttyname(0), '/') + 1;
        !            52:        /* check for, and strip out, the machine name of the target */
        !            53:        for (ptr = argv[1]; *ptr != '\0' && *ptr != '@' && *ptr != ':' &&
        !            54:            *ptr != '!' && *ptr != '.'; ptr++)
        !            55:                ;
        !            56:        if (*ptr == '\0') {
        !            57:                /* this is a local to local talk */
        !            58:                his_name = argv[1];
        !            59:                his_machine_name = my_machine_name;
        !            60:        } else {
        !            61:                if (*ptr == '@') {
        !            62:                        /* user@host */
        !            63:                        his_name = argv[1];
        !            64:                        his_machine_name = ptr + 1;
        !            65:                } else {
        !            66:                        /* host.user or host!user or host:user */
        !            67:                        his_name = ptr + 1;
        !            68:                        his_machine_name = argv[1];
        !            69:                }
        !            70:                *ptr = '\0';
        !            71:        }
        !            72:        if (argc > 2)
        !            73:                his_tty = argv[2];      /* tty name is arg 2 */
        !            74:        else
        !            75:                his_tty = "";
        !            76:        get_addrs(my_machine_name, his_machine_name);
        !            77:        /* Load these useful values into the standard message header */
        !            78:        msg.id_num = 0;
        !            79:        strncpy(msg.l_name, my_name, NAME_SIZE);
        !            80:        msg.l_name[NAME_SIZE - 1] = '\0';
        !            81:        strncpy(msg.r_name, his_name, NAME_SIZE);
        !            82:        msg.r_name[NAME_SIZE - 1] = '\0';
        !            83:        strncpy(msg.r_tty, his_tty, TTY_SIZE);
        !            84:        msg.r_tty[TTY_SIZE - 1] = '\0';
        !            85: }

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