Usenet 1994 January/usenetsourcesnewsgroupsinfomagicjanuary1994.iso/sources/unix/volume10/cbw/part02/start.c

C/C++ Source or Header | 1987-06-16 | 4.7 KB | 258 lines

/*
 * Start up module for the crypt breaking editor.
 * Much of the global behavior of the program is set here.
 *
 * Robert W. Baldwin, December 1984.
 *
 * Bob Baldwin, 10/86:
 *  Added cmd to jump to user window.
 *  Handle C-Z to suspend CBW and abort commands.
 */


#include    <stdio.h>
#include    <signal.h>
#include    <setjmp.h>
#include    "window.h"
#include    "terminal.h"
#include    "layout.h"
#include    "specs.h"


/* Shell variable names. */
#define    LETTERSTATS    "LETTERSTATS"
#define    BIGRAMSTATS    "BIGRAMSTATS"
#define    TRIGRAMSTATS    "TRIGRAMSTATS"

#define    QUITMSG    "Permutations not saved.  Type 'y' if you want to quit."


/* Keystroke behavior that is the same in all windows.
 */
extern        alldraw(), jumpcmd();
extern    char    *getenv();

keyer    topktab[] = {
        {CREFRESH, alldraw},
        {CJUMPCMD, jumpcmd},
        {0, NULL},
        };


/* Table of all top-level windows.  Terminated by NULL.
 */
gwindow        *wtable[WINDNUM+1];
char        cfilebuf[100];
char        pfilebuf[100];

/* Saved stack state for suspending the program.
 */
jmp_buf        saved_stack;


main(argc, argv)
int        argc;
char    *argv[];
{
    extern    stop_handler();
    extern    kill_handler();
    char    *q, *pp, *pc;

    if (argc < 2)  {
        printf("Usage: %s FileNameRoot\n", argv[0]);
        printf("\tThe extensions .cipher and .perm will be used.");
        printf("\n\tThe shell variables");
        printf(" %s, %s, %s,", LETTERSTATS, TRIGRAMSTATS, BIGRAMSTATS);
        printf("\n\tand TERM must be defined.");
        printf("\n\tThe shell variables");
        printf(" %s and %s", GRAPHICSVAR, KEYMAPVAR);
        printf(" may be defined.");
        printf("\n");
        exit(0);
        }
    q = argv[1];
    pc = cipherfile = cfilebuf;
    pp = permfile = pfilebuf;
    while (*pp++ = *pc++ = *q++);
    pp--;
    pc--;
    q = ".cipher";
    while (*pc++ = *q++);
    q = ".perm";
    while (*pp++ = *q++);

    load_tables();

    set_term();
    signal(SIGTSTP, stop_handler);
    signal(SIGINT, kill_handler);

    initwindows();

    /* Control returns here when program restarted after C-Z. */
     setjmp(saved_stack);

    alldraw();
    usrstatus(&user, "Ready.");
    usrfirst(&user, 1, 1);        /* Start in user window. */

    wl_driver(wtable);
    done(0);            /* Fell off windows, we're done. */
}


/* Handle C-Z signal (suspend program).
 * Restore screen and exit.
 * On restart, setup screen, redraw screen, and abort to top loop.
 */
stop_handler()
{
    setcursor(MAXHEIGHT, 1);
    fflush(stdout);
    unset_term();

    kill(getpid(), SIGSTOP);

    /* Return here when/if program restarted. */
    /* Note that the signal mask is restored by longjmp. */
    set_term();
    longjmp(saved_stack, 0);
}


/* Handle C-C signal (kill program).
 * Restore screen and exit.
 */
kill_handler()
{
    setcursor(MAXHEIGHT, 1);
    printf("\n");
    fflush(stdout);
    unset_term();

    kill(getpid(), SIGKILL);
}


/* Load stat tables.
 */
load_tables()
{
    printf("\n\nLoading letter statistics ...");
    fflush(stdout);
    if ((letterstats = getenv(LETTERSTATS)) == NULL)  {
        printf("The shell variable %s is not defined.\n", LETTERSTATS);
        exit(0);
        }
    load_1stats_from(letterstats);
    printf(" done.\n");

    printf("\n\nLoading bigram statistics ...");
    fflush(stdout);
    if ((bigramstats = getenv(BIGRAMSTATS)) == NULL)  {
        printf("The shell variable %s is not defined.\n", BIGRAMSTATS);
        exit(0);
        }
    load_2stats_from(bigramstats);
    printf(" done.\n");

    printf("\n\nLoading trigram statistics ...");
    fflush(stdout);
    if ((trigramstats = getenv(TRIGRAMSTATS)) == NULL)  {
        printf("The shell variable %s is not defined.\n",TRIGRAMSTATS);
        exit(0);
        }
    load_tri_from(trigramstats);
    printf(" done.\n");

    permchgflg = FALSE;
}


/* Quit command
 * This is the prefered way to leave the program.
 */
char *quitcmd(arg)
char    *arg;
{
    char    c;

    if (permchgflg)  {
        usrstatus(&user, QUITMSG);
        c = getchar();
        if (!(c == 'y'  ||  c == 'Y'))
              return(NULL);
        }
    done(0);
}


/* Exit the program after cleaning up the terminal.
 */
done(status)
int    status;
{
    unset_term();
    printf("\n");
    exit(status);
}


/* (re)Draw all the windows.
 */
alldraw()
{
    wl_refresh(wtable);
}


/* Jump to the command window.
 * Tell the current window, that it is losing the cursor, and
 * then tell the user window that it's got the cursor.
 */
jumpcmd(w)
gwindow    *w;
{
    (*(w->wlast))(w);
    usrfirst(&user, 1, 1);        /* Given row, col ignored. */
}


/* Fill in the window table.
 */
initwindows()
{
    int    i;

    i = 0;
    wtable[i++] = iuser();
    wtable[i++] = ibanner();
    wtable[i++] = idblabel();
    wtable[i++] = idbstore();
    wtable[i++] = igblabel();
    wtable[i++] = igbstore();
    wtable[i++] = iwebster();

    if (i != WINDNUM)  {
        disperr("inittables: WINDNUM value is wrong");
        setcursor(2,1);
        exit(0);
        }

    wtable[i] = ((gwindow *) NULL);
}


/* Get keystroke routine.
 * Responsible for clearing the status area before every keystroke.
 */
key    u_getkey()
{
    key    k;

    k = getcmd();
    usrstatus(&user, "");

    return(k);
}