/*      $OpenBSD: cchar.c,v 1.12 2016/03/23 14:52:42 mmcc Exp $ */
/*      $NetBSD: cchar.c,v 1.10 1996/05/07 18:20:05 jtc Exp $   */

/*-
 * Copyright (c) 1991, 1993, 1994
 *      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. 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.
 */

#include <sys/types.h>
#include <sys/ioctl.h>

#include <err.h>
#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <termios.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.
 */
const 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 },
        { "min",        VMIN,           CMIN },
        { "quit",       VQUIT,          CQUIT },
        { "reprint",    VREPRINT,       CREPRINT },
        { "start",      VSTART,         CSTART },
        { "status",     VSTATUS,        CSTATUS },
        { "stop",       VSTOP,          CSTOP },
        { "susp",       VSUSP,          CSUSP },
        { "time",       VTIME,          CTIME },
        { "werase",     VWERASE,        CWERASE },
        { NULL },
};

const struct cchar cchars2[] = {
        { "brk",        VEOL,           CEOL },
        { "flush",      VDISCARD,       CDISCARD },
        { "rprnt",      VREPRINT,       CREPRINT },
        { NULL },
};

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

int
csearch(char ***argvp, struct info *ip)
{
        struct cchar *cp, tmp;
        long val;
        char *arg, *ep, *name;

        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, cchars2,
            sizeof(cchars2)/sizeof(struct cchar) - 1, sizeof(struct cchar),
            c_cchar)))
                return (0);

        arg = *++*argvp;
        if (!arg) {
                warnx("option requires an argument -- %s", name);
                usage();
        }

#define CHK(s)  (*arg == s[0] && !strcmp(arg, s))
        if (CHK("undef") || CHK("<undef>"))
                ip->t.c_cc[cp->sub] = _POSIX_VDISABLE;
        else if (cp->sub == VMIN || cp->sub == VTIME) {
                val = strtol(arg, &ep, 10);
                if (val > UCHAR_MAX || val < 0) {
                        warnx("maximum option value is %d -- %s",
                            UCHAR_MAX, name);
                        usage();
                }
                if (*ep != '\0') {
                        warnx("option requires a numeric argument -- %s", name);
                        usage();
                }
                ip->t.c_cc[cp->sub] = val;
        } 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);
}