ttyio.c

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    struct winsize wsz;
#ifdef DEBUG_WINSZ
    static int firsttime = TRUE;
#endif

    /* see termio(4) under, e.g., SunOS */
    if (ioctl(1, TIOCGWINSZ, &wsz) == 0) {
#ifdef DEBUG_WINSZ
        if (firsttime) {
            firsttime = FALSE;
            fprintf(stderr, "ttyio.c screensize():  ws_row = %d\n",
              wsz.ws_row);
            fprintf(stderr, "ttyio.c screensize():  ws_col = %d\n",
              wsz.ws_col);
        }
#endif
        /* number of rows */
        if (tt_rows != NULL)
            *tt_rows = (int)((wsz.ws_row > 0) ? wsz.ws_row : 24);
        /* number of columns */
        if (tt_cols != NULL)
            *tt_cols = (int)((wsz.ws_col > 0) ? wsz.ws_col : 80);
        return 0;    /* signal success */
    } else {         /* this happens when piping to more(1), for example */
#ifdef DEBUG_WINSZ
        if (firsttime) {
            firsttime = FALSE;
            fprintf(stderr,
              "ttyio.c screensize():  ioctl(TIOCGWINSZ) failed\n"));
        }
#endif
        /* VT-100 assumed to be minimal hardware */
        if (tt_rows != NULL)
            *tt_rows = 24;
        if (tt_cols != NULL)
            *tt_cols = 80;
        return 1;       /* signal failure */
    }
}

#else /* !TIOCGWINSZ: service not available, fall back to semi-bogus method */

int screensize(tt_rows, tt_cols)
    int *tt_rows;
    int *tt_cols;
{
    char *envptr, *getenv();
    int n;
    int errstat = 0;

    /* GRR:  this is overly simplistic, but don't have access to stty/gtty
     * system anymore
     */
    if (tt_rows != NULL) {
        envptr = getenv("LINES");
        if (envptr == (char *)NULL || (n = atoi(envptr)) < 5) {
            /* VT-100 assumed to be minimal hardware */
            *tt_rows = 24;
            errstat = 1;    /* signal failure */
        } else {
            *tt_rows = n;
        }
    }
    if (tt_cols != NULL) {
        envptr = getenv("COLUMNS");
        if (envptr == (char *)NULL || (n = atoi(envptr)) < 5) {
            *tt_cols = 80;
            errstat = 1;    /* signal failure */
        } else {
            *tt_cols = n;
        }
    }
    return errstat;
}

#endif /* ?(TIOCGWINSZ && !M_UNIX) */
#endif /* MORE */


/*
 * Get a character from the given file descriptor without echo or newline.
 */
int zgetch(__G__ f)
    __GDEF
    int f;                      /* file descriptor from which to read */
{
#if (defined(USE_SYSV_TERMIO) || defined(USE_POSIX_TERMIOS))
    char oldmin, oldtim;
#endif
    char c;
    struct sgttyb sg;           /* tty device structure */

    GTTY(f, &sg);               /* get settings */
#if (defined(USE_SYSV_TERMIO) || defined(USE_POSIX_TERMIOS))
    oldmin = sg.c_cc[VMIN];     /* save old values */
    oldtim = sg.c_cc[VTIME];
    sg.c_cc[VMIN] = 1;          /* need only one char to return read() */
    sg.c_cc[VTIME] = 0;         /* no timeout */
    sg.sg_flags &= ~ICANON;     /* canonical mode off */
#else
    sg.sg_flags |= CBREAK;      /* cbreak mode on */
#endif
    sg.sg_flags &= ~ECHO;       /* turn echo off, too */
    STTY(f, &sg);               /* set cbreak mode */
    GLOBAL(echofd) = f;         /* in case ^C hit (not perfect: still CBREAK) */

    read(f, &c, 1);             /* read our character */

#if (defined(USE_SYSV_TERMIO) || defined(USE_POSIX_TERMIOS))
    sg.c_cc[VMIN] = oldmin;     /* restore old values */
    sg.c_cc[VTIME] = oldtim;
    sg.sg_flags |= ICANON;      /* canonical mode on */
#else
    sg.sg_flags &= ~CBREAK;     /* cbreak mode off */
#endif
    sg.sg_flags |= ECHO;        /* turn echo on */
    STTY(f, &sg);               /* restore canonical mode */
    GLOBAL(echofd) = -1;

    return (int)(uch)c;
}


#else /* !UNIX && !__BEOS__ */
#ifndef VMS     /* VMS supplies its own variant of getch() */


int zgetch(__G__ f)
    __GDEF
    int f;    /* file descriptor from which to read (must be open already) */
{
    char c, c2;

/*---------------------------------------------------------------------------
    Get a character from the given file descriptor without echo; can't fake
    CBREAK mode (i.e., newline required), but can get rid of all chars up to
    and including newline.
  ---------------------------------------------------------------------------*/

    echoff(f);
    read(f, &c, 1);
    if (c != '\n')
        do {
            read(f, &c2, 1);   /* throw away all other chars up thru newline */
        } while (c2 != '\n');
    echon();
    return (int)c;
}

#endif /* !VMS */
#endif /* ?(UNIX || __BEOS__) */

#endif /* UNZIP && !FUNZIP */
#endif /* !HAVE_WORKING_GETCH */


#if CRYPT                       /* getp() is only used with full encryption */

/*
 * Simple compile-time check for source compatibility between
 * zcrypt and ttyio:
 */
#if (!defined(CR_MAJORVER) || (CR_MAJORVER < 2) || (CR_MINORVER < 7))
   error:  This Info-ZIP tool requires zcrypt 2.7 or later.
#endif

/*
 * Get a password of length n-1 or less into *p using the prompt *m.
 * The entered password is not echoed.
 */

#ifdef HAVE_WORKING_GETCH
/*
 * For the AMIGA, getch() is defined as Agetch(), which is in
 * amiga/filedate.c; SAS/C 6.x provides a getch(), but since Agetch()
 * uses the infrastructure that is already in place in filedate.c, it is
 * smaller.  With this function, echoff() and echon() are not needed.
 *
 * For the MAC, a non-echo macgetch() function is defined in the MacOS
 * specific sources which uses the event handling mechanism of the
 * desktop window manager to get a character from the keyboard.
 *
 * For the other systems in this section, a non-echo getch() function
 * is either contained the C runtime library (conio package), or getch()
 * is defined as an alias for a similar system specific RTL function.
 */

#ifndef WINDLL   /* WINDLL does not support a console interface */
#ifndef QDOS     /* QDOS supplies a variant of this function */

/* This is the getp() function for all systems (with TTY type user interface)
 * that supply a working `non-echo' getch() function for "raw" console input.
 */
char *getp(__G__ m, p, n)
    __GDEF
    ZCONST char *m;             /* prompt for password */
    char *p;                    /* return value: line input */
    int n;                      /* bytes available in p[] */
{
    char c;                     /* one-byte buffer for read() to use */
    int i;                      /* number of characters input */
    char *w;                    /* warning on retry */

    /* get password */
    w = "";
    do {
        fputs(w, stderr);       /* warning if back again */
        fputs(m, stderr);       /* display prompt and flush */
        fflush(stderr);
        i = 0;
        do {                    /* read line, keeping first n characters */
            if ((c = (char)getch()) == '\r')
                c = '\n';       /* until user hits CR */
            if (c == 8 || c == 127) {
                if (i > 0) i--; /* the `backspace' and `del' keys works */
            }
            else if (i < n)
                p[i++] = c;     /* truncate past n */
        } while (c != '\n');
        PUTC('\n', stderr);  fflush(stderr);
        w = "(line too long--try again)\n";
    } while (p[i-1] != '\n');
    p[i-1] = 0;                 /* terminate at newline */

    return p;                   /* return pointer to password */

} /* end function getp() */

#endif /* !QDOS */
#endif /* !WINDLL */


#else /* !HAVE_WORKING_GETCH */


#if (defined(UNIX) || defined(__MINT__) || defined(__BEOS__))

#ifndef _PATH_TTY
#  ifdef __MINT__
#    define _PATH_TTY ttyname(2)
#  else
#    define _PATH_TTY "/dev/tty"
#  endif
#endif

char *getp(__G__ m, p, n)
    __GDEF
    ZCONST char *m;             /* prompt for password */
    char *p;                    /* return value: line input */
    int n;                      /* bytes available in p[] */
{
    char c;                     /* one-byte buffer for read() to use */
    int i;                      /* number of characters input */
    char *w;                    /* warning on retry */
    int f;                      /* file descriptor for tty device */

#ifdef PASSWD_FROM_STDIN
    /* Read from stdin. This is unsafe if the password is stored on disk. */
    f = 0;
#else
    /* turn off echo on tty */

    if ((f = open(_PATH_TTY, 0)) == -1)
        return NULL;
#endif
    /* get password */
    w = "";
    do {
        fputs(w, stderr);       /* warning if back again */
        fputs(m, stderr);       /* prompt */
        fflush(stderr);
        i = 0;
        echoff(f);
        do {                    /* read line, keeping n */
            read(f, &c, 1);
            if (i < n)
                p[i++] = c;
        } while (c != '\n');
        echon();
        PUTC('\n', stderr);  fflush(stderr);
        w = "(line too long--try again)\n";
    } while (p[i-1] != '\n');
    p[i-1] = 0;                 /* terminate at newline */

#ifndef PASSWD_FROM_STDIN
    close(f);
#endif

    return p;                   /* return pointer to password */

} /* end function getp() */

#endif /* UNIX || __MINT__ || __BEOS__ */



#if (defined(VMS) || defined(CMS_MVS))

char *getp(__G__ m, p, n)
    __GDEF
    ZCONST char *m;             /* prompt for password */
    char *p;                    /* return value: line input */
    int n;                      /* bytes available in p[] */
{
    char c;                     /* one-byte buffer for read() to use */
    int i;                      /* number of characters input */
    char *w;                    /* warning on retry */
    FILE *f;                    /* file structure for SYS$COMMAND device */

#ifdef PASSWD_FROM_STDIN
    f = stdin;
#else
    if ((f = fopen(ctermid(NULL), "r")) == NULL)
        return NULL;
#endif

    /* get password */
    fflush(stdout);
    w = "";
    do {
        if (*w)                 /* bug: VMS apparently adds \n to NULL fputs */
            fputs(w, stderr);   /* warning if back again */
        fputs(m, stderr);       /* prompt */
        fflush(stderr);
        i = 0;
        echoff(f);
        do {                    /* read line, keeping n */
            if ((c = (char)getc(f)) == '\r')
                c = '\n';
            if (i < n)
                p[i++] = c;
        } while (c != '\n');
        echon();
        PUTC('\n', stderr);  fflush(stderr);
        w = "(line too long--try again)\n";
    } while (p[i-1] != '\n');
    p[i-1] = 0;                 /* terminate at newline */
#ifndef PASSWD_FROM_STDIN
    fclose(f);
#endif

    return p;                   /* return pointer to password */

} /* end function getp() */

#endif /* VMS || CMS_MVS */
#endif /* ?HAVE_WORKING_GETCH */
#endif /* CRYPT */
#endif /* CRYPT || (UNZIP && !FUNZIP) */