bin/stty/cchar.c

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)cchar.c     5.4 (Berkeley) 6/10/91";
#endif /* not lint */

#include <sys/types.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "stty.h"
#include "extern.h"

/*
 * Special control characters.
 *
 * Cchars1 are the standard names, cchars2 are the old aliases.
 * The first are displayed, but both are recognized on the
 * command line.
 */
struct cchar cchars1[] = {
        "discard",      VDISCARD,       CDISCARD,
        "dsusp",        VDSUSP,         CDSUSP,
        "eof",          VEOF,           CEOF,
        "eol",          VEOL,           CEOL,
        "eol2",         VEOL2,          CEOL,
        "erase",        VERASE,         CERASE,
        "intr",         VINTR,          CINTR,
        "kill",         VKILL,          CKILL,
        "lnext",        VLNEXT,         CLNEXT,
        "quit",         VQUIT,          CQUIT,
        "reprint",      VREPRINT,       CREPRINT,
        "start",        VSTART,         CSTART,
        "status",       VSTATUS,        CSTATUS,
        "stop",         VSTOP,          CSTOP,
        "susp",         VSUSP,          CSUSP,
        "werase",       VWERASE,        CWERASE,
        NULL,
};

struct cchar cchars2[] = {
        "brk",          VEOL,           CEOL,
        "flush",        VDISCARD,       CDISCARD,
        "rprnt",        VREPRINT,       CREPRINT,
        "xoff",         VSTOP,          CSTOP,
        "xon",          VSTART,         CSTART,
        NULL,
};

csearch(argvp, ip)
        char ***argvp;
        struct info *ip;
{
        extern char *usage;
        register struct cchar *cp;
        struct cchar tmp;
        char *arg, *name;
        static int c_cchar __P((const void *, const void *));

        name = **argvp;

        tmp.name = name;
        if (!(cp = (struct cchar *)bsearch(&tmp, cchars1,
            sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
            c_cchar)) && !(cp = (struct cchar *)bsearch(&tmp, cchars1,
            sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
            c_cchar)))
                return(0);

        arg = *++*argvp;
        if (!arg)
                err("option requires an argument -- %s\n%s", name, usage);

#define CHK(s)  (*name == s[0] && !strcmp(name, s))
        if (CHK("undef") || CHK("<undef>"))
                ip->t.c_cc[cp->sub] = _POSIX_VDISABLE;
        else if (arg[0] == '^')
                ip->t.c_cc[cp->sub] = (arg[1] == '?') ? 0177 :
                    (arg[1] == '-') ? _POSIX_VDISABLE : arg[1] & 037;
        else
                ip->t.c_cc[cp->sub] = arg[0];
        ip->set = 1;
        return(1);
}

static
c_cchar(a, b)
        const void *a, *b;
{
        return(strcmp(((struct cchar *)a)->name, ((struct cchar *)b)->name));
}