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Annotation of 43BSD/ucb/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        5.2 (Berkeley) 3/13/86";
        !             9: #endif not lint
        !            10: 
        !            11: #include "talk.h"
        !            12: #include <sys/param.h>
        !            13: #include <protocols/talkd.h>
        !            14: 
        !            15: char   *getlogin();
        !            16: char   *ttyname();
        !            17: char   *rindex();
        !            18: static any();
        !            19: extern CTL_MSG msg;
        !            20: 
        !            21: /*
        !            22:  * Determine the local and remote user, tty, and machines
        !            23:  */
        !            24: get_names(argc, argv)
        !            25:        int argc;
        !            26:        char *argv[];
        !            27: {
        !            28:        char hostname[MAXHOSTNAMELEN];
        !            29:        char *his_name, *my_name;
        !            30:        char *my_machine_name, *his_machine_name;
        !            31:        char *my_tty, *his_tty;
        !            32:        register char *cp;
        !            33: 
        !            34:        if (argc < 2 ) {
        !            35:                printf("Usage: talk user [ttyname]\n");
        !            36:                exit(-1);
        !            37:        }
        !            38:        if (!isatty(0)) {
        !            39:                printf("Standard input must be a tty, not a pipe or a file\n");
        !            40:                exit(-1);
        !            41:        }
        !            42:        my_name = getlogin();
        !            43:        if (my_name == NULL) {
        !            44:                printf("You don't exist. Go away.\n");
        !            45:                exit(-1);
        !            46:        }
        !            47:        gethostname(hostname, sizeof (hostname));
        !            48:        my_machine_name = hostname;
        !            49:        my_tty = rindex(ttyname(0), '/') + 1;
        !            50:        /* check for, and strip out, the machine name of the target */
        !            51:        for (cp = argv[1]; *cp && !any(*cp, "@:!."); cp++)
        !            52:                ;
        !            53:        if (*cp == '\0') {
        !            54:                /* this is a local to local talk */
        !            55:                his_name = argv[1];
        !            56:                his_machine_name = my_machine_name;
        !            57:        } else {
        !            58:                if (*cp++ == '@') {
        !            59:                        /* user@host */
        !            60:                        his_name = argv[1];
        !            61:                        his_machine_name = cp;
        !            62:                } else {
        !            63:                        /* host.user or host!user or host:user */
        !            64:                        his_name = cp;
        !            65:                        his_machine_name = argv[1];
        !            66:                }
        !            67:                *--cp = '\0';
        !            68:        }
        !            69:        if (argc > 2)
        !            70:                his_tty = argv[2];      /* tty name is arg 2 */
        !            71:        else
        !            72:                his_tty = "";
        !            73:        get_addrs(my_machine_name, his_machine_name);
        !            74:        /*
        !            75:         * Initialize the message template.
        !            76:         */
        !            77:        msg.vers = TALK_VERSION;
        !            78:        msg.addr.sa_family = htons(AF_INET);
        !            79:        msg.ctl_addr.sa_family = htons(AF_INET);
        !            80:        msg.id_num = htonl(0);
        !            81:        strncpy(msg.l_name, my_name, NAME_SIZE);
        !            82:        msg.l_name[NAME_SIZE - 1] = '\0';
        !            83:        strncpy(msg.r_name, his_name, NAME_SIZE);
        !            84:        msg.r_name[NAME_SIZE - 1] = '\0';
        !            85:        strncpy(msg.r_tty, his_tty, TTY_SIZE);
        !            86:        msg.r_tty[TTY_SIZE - 1] = '\0';
        !            87: }
        !            88: 
        !            89: static
        !            90: any(c, cp)
        !            91:        register char c, *cp;
        !            92: {
        !            93: 
        !            94:        while (*cp)
        !            95:                if (c == *cp++)
        !            96:                        return (1);
        !            97:        return (0);
        !            98: }

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