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cchar.c revision 1.6 
      1 /*-
      2  * Copyright (c) 1991 The Regents of the University of California.
      3  * 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 /*static char sccsid[] = "from: @(#)cchar.c	5.4 (Berkeley) 6/10/91";*/
     36 static char rcsid[] = "$Id: cchar.c,v 1.6 1993/12/10 09:51:38 cgd Exp $";
     37 #endif /* not lint */
     38 
     39 #include <sys/types.h>
     40 #include <stddef.h>
     41 #include <stdlib.h>
     42 #include <string.h>
     43 #include "stty.h"
     44 #include "extern.h"
     45 
     46 /*
     47  * Special control characters.
     48  *
     49  * Cchars1 are the standard names, cchars2 are the old aliases.
     50  * The first are displayed, but both are recognized on the
     51  * command line.
     52  */
     53 struct cchar cchars1[] = {
     54 	"discard",	VDISCARD, 	CDISCARD,
     55 	"dsusp", 	VDSUSP,		CDSUSP,
     56 	"eof",		VEOF,		CEOF,
     57 	"eol",		VEOL,		CEOL,
     58 	"eol2",		VEOL2,		CEOL,
     59 	"erase",	VERASE,		CERASE,
     60 	"intr",		VINTR,		CINTR,
     61 	"kill",		VKILL,		CKILL,
     62 	"lnext",	VLNEXT,		CLNEXT,
     63 	"quit",		VQUIT,		CQUIT,
     64 	"reprint",	VREPRINT, 	CREPRINT,
     65 	"start",	VSTART,		CSTART,
     66 	"status",	VSTATUS, 	CSTATUS,
     67 	"stop",		VSTOP,		CSTOP,
     68 	"susp",		VSUSP,		CSUSP,
     69 	"werase",	VWERASE,	CWERASE,
     70 	NULL,
     71 };
     72 
     73 struct cchar cchars2[] = {
     74 	"brk",		VEOL,		CEOL,
     75 	"flush",	VDISCARD, 	CDISCARD,
     76 	"rprnt",	VREPRINT, 	CREPRINT,
     77 	"xoff",		VSTOP,		CSTOP,
     78 	"xon",		VSTART,		CSTART,
     79 	NULL,
     80 };
     81 
     82 csearch(argvp, ip)
     83 	char ***argvp;
     84 	struct info *ip;
     85 {
     86 	extern char *usage;
     87 	register struct cchar *cp;
     88 	struct cchar tmp;
     89 	char *arg, *name;
     90 	static int c_cchar __P((const void *, const void *));
     91 
     92 	name = **argvp;
     93 
     94 	tmp.name = name;
     95 	if (!(cp = (struct cchar *)bsearch(&tmp, cchars1,
     96 	    sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
     97 	    c_cchar)) && !(cp = (struct cchar *)bsearch(&tmp, cchars1,
     98 	    sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
     99 	    c_cchar)))
    100 		return(0);
    101 
    102 	arg = *++*argvp;
    103 	if (!arg)
    104 		err("option requires an argument -- %s\n%s", name, usage);
    105 
    106 #define CHK(s)  (*arg == s[0] && !strcmp(arg, s))
    107 	if (CHK("undef") || CHK("<undef>"))
    108 		ip->t.c_cc[cp->sub] = _POSIX_VDISABLE;
    109 	else if (arg[0] == '^')
    110 		ip->t.c_cc[cp->sub] = (arg[1] == '?') ? 0177 :
    111 		    (arg[1] == '-') ? _POSIX_VDISABLE : arg[1] & 037;
    112 	else
    113 		ip->t.c_cc[cp->sub] = arg[0];
    114 	ip->set = 1;
    115 	return(1);
    116 }
    117 
    118 static
    119 c_cchar(a, b)
    120         const void *a, *b;
    121 {
    122         return(strcmp(((struct cchar *)a)->name, ((struct cchar *)b)->name));
    123 }
    124