cchar.c revision 76810 
1/*-
2 * Copyright (c) 1991, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35#if 0
36static char sccsid[] = "@(#)cchar.c	8.5 (Berkeley) 4/2/94";
37#endif
38static const char rcsid[] =
39  "$FreeBSD: head/bin/stty/cchar.c 76810 2001-05-18 11:04:19Z kris $";
40#endif /* not lint */
41
42#include <sys/types.h>
43
44#include <err.h>
45#include <limits.h>
46#include <stddef.h>
47#include <stdlib.h>
48#include <string.h>
49
50#include "stty.h"
51#include "extern.h"
52
53static int c_cchar __P((const void *, const void *));
54
55/*
56 * Special control characters.
57 *
58 * Cchars1 are the standard names, cchars2 are the old aliases.
59 * The first are displayed, but both are recognized on the
60 * command line.
61 */
62struct cchar cchars1[] = {
63	{ "discard",	VDISCARD, 	CDISCARD },
64	{ "dsusp", 	VDSUSP,		CDSUSP },
65	{ "eof",	VEOF,		CEOF },
66	{ "eol",	VEOL,		CEOL },
67	{ "eol2",	VEOL2,		CEOL },
68	{ "erase",	VERASE,		CERASE },
69	{ "erase2",	VERASE2,	CERASE2 },
70	{ "intr",	VINTR,		CINTR },
71	{ "kill",	VKILL,		CKILL },
72	{ "lnext",	VLNEXT,		CLNEXT },
73	{ "min",	VMIN,		CMIN },
74	{ "quit",	VQUIT,		CQUIT },
75	{ "reprint",	VREPRINT, 	CREPRINT },
76	{ "start",	VSTART,		CSTART },
77	{ "status",	VSTATUS, 	CSTATUS },
78	{ "stop",	VSTOP,		CSTOP },
79	{ "susp",	VSUSP,		CSUSP },
80	{ "time",	VTIME,		CTIME },
81	{ "werase",	VWERASE,	CWERASE },
82	{ NULL,		0,		0},
83};
84
85struct cchar cchars2[] = {
86	{ "brk",	VEOL,		CEOL },
87	{ "flush",	VDISCARD, 	CDISCARD },
88	{ "rprnt",	VREPRINT, 	CREPRINT },
89	{ NULL,		0,		0 },
90};
91
92static int
93c_cchar(a, b)
94        const void *a, *b;
95{
96
97        return (strcmp(((const struct cchar *)a)->name, ((const struct cchar *)b)->name));
98}
99
100int
101csearch(argvp, ip)
102	char ***argvp;
103	struct info *ip;
104{
105	struct cchar *cp, tmp;
106	long val;
107	char *arg, *ep, *name;
108
109	name = **argvp;
110
111	tmp.name = name;
112	if (!(cp = (struct cchar *)bsearch(&tmp, cchars1,
113	    sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
114	    c_cchar)) && !(cp = (struct cchar *)bsearch(&tmp, cchars2,
115	    sizeof(cchars2)/sizeof(struct cchar) - 1, sizeof(struct cchar),
116	    c_cchar)))
117		return (0);
118
119	arg = *++*argvp;
120	if (!arg) {
121		warnx("option requires an argument -- %s", name);
122		usage();
123	}
124
125#define CHK(s)  (*arg == s[0] && !strcmp(arg, s))
126	if (CHK("undef") || CHK("<undef>"))
127		ip->t.c_cc[cp->sub] = _POSIX_VDISABLE;
128	else if (cp->sub == VMIN || cp->sub == VTIME) {
129		val = strtol(arg, &ep, 10);
130		if (val > UCHAR_MAX) {
131			warnx("maximum option value is %d -- %s",
132			    UCHAR_MAX, name);
133			usage();
134		}
135		if (*ep != '\0') {
136			warnx("option requires a numeric argument -- %s", name);
137			usage();
138		}
139		ip->t.c_cc[cp->sub] = val;
140	} else if (arg[0] == '^')
141		ip->t.c_cc[cp->sub] = (arg[1] == '?') ? 0177 :
142		    (arg[1] == '-') ? _POSIX_VDISABLE : arg[1] & 037;
143	else
144		ip->t.c_cc[cp->sub] = arg[0];
145	ip->set = 1;
146	return (1);
147}
148