main.c

unix环境高级编程的源代码

#include    "lprps.h"

static void    usage(void);

int
main(int argc, char *argv[])
{
    int            c;

    log_open("lprps", LOG_PID, LOG_LPR);

    opterr = 0;        /* don't want getopt() writing to stderr */
    while ( (c = getopt(argc, argv, "cdh:i:l:n:x:y:w:")) != EOF) {
        switch (c) {
        case 'c':        /* control chars to be passed */
        case 'x':        /* horizontal page size */
        case 'y':        /* vertical page size */
        case 'w':        /* width */
        case 'l':        /* length */
        case 'i':        /* indent */
            break;    /* not interested in these */

        case 'd':        /* debug (interactive) */
            debug = 1;
            break;

        case 'n':        /* login name of user */
            loginname = optarg;
            break;

        case 'h':        /* host name of user */
            hostname = optarg;
            break;
        case '?':
            log_msg("unrecognized option: -%c", optopt);
            usage();
        }
    }

    if (hostname == NULL || loginname == NULL)
        usage();    /* require both hostname and loginname */

    if (optind < argc)
        acct_file = argv[optind];    /* remaining arg = acct file */

    if (debug)
        tty_open();

    if (atexit(close_mailfp) < 0)    /* register func for exit() */
        log_sys("main: atexit error");

    get_status();

    get_page(&start_page);

    send_file();            /* copies stdin to printer */

    get_page(&end_page);

    do_acct();

    exit(EXIT_SUCCESS);
}

static void
usage(void)
{
    log_msg("lprps: invalid arguments");
    exit(EXIT_THROW_AWAY);
}