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cchar.c revision 1.7 
      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 1.7 1994/03/23 04:05:24 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 #include <sys/types.h>
     40 #include <err.h>
     41 #include <limits.h>
     42 #include <stddef.h>
     43 #include <stdlib.h>
     44 #include <string.h>
     45 #include "stty.h"
     46 #include "extern.h"
     47 
     48 /*
     49  * Special control characters.
     50  *
     51  * Cchars1 are the standard names, cchars2 are the old aliases.
     52  * The first are displayed, but both are recognized on the
     53  * command line.
     54  */
     55 struct cchar cchars1[] = {
     56 	"discard",	VDISCARD, 	CDISCARD,
     57 	"dsusp", 	VDSUSP,		CDSUSP,
     58 	"eof",		VEOF,		CEOF,
     59 	"eol",		VEOL,		CEOL,
     60 	"eol2",		VEOL2,		CEOL,
     61 	"erase",	VERASE,		CERASE,
     62 	"intr",		VINTR,		CINTR,
     63 	"kill",		VKILL,		CKILL,
     64 	"lnext",	VLNEXT,		CLNEXT,
     65 	"min",		VMIN,		CMIN,
     66 	"quit",		VQUIT,		CQUIT,
     67 	"reprint",	VREPRINT, 	CREPRINT,
     68 	"start",	VSTART,		CSTART,
     69 	"status",	VSTATUS, 	CSTATUS,
     70 	"stop",		VSTOP,		CSTOP,
     71 	"susp",		VSUSP,		CSUSP,
     72 	"time",		VTIME,		CTIME,
     73 	"werase",	VWERASE,	CWERASE,
     74 	NULL,
     75 };
     76 
     77 struct cchar cchars2[] = {
     78 	"brk",		VEOL,		CEOL,
     79 	"flush",	VDISCARD, 	CDISCARD,
     80 	"rprnt",	VREPRINT, 	CREPRINT,
     81 	"xoff",		VSTOP,		CSTOP,
     82 	"xon",		VSTART,		CSTART,
     83 	NULL,
     84 };
     85 
     86 csearch(argvp, ip)
     87 	char ***argvp;
     88 	struct info *ip;
     89 {
     90 	register struct cchar *cp;
     91 	struct cchar tmp;
     92 	long val;
     93 	char *arg, *ep, *name;
     94 	static int c_cchar __P((const void *, const void *));
     95 
     96 	name = **argvp;
     97 
     98 	tmp.name = name;
     99 	if (!(cp = (struct cchar *)bsearch(&tmp, cchars1,
    100 	    sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
    101 	    c_cchar)) && !(cp = (struct cchar *)bsearch(&tmp, cchars1,
    102 	    sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
    103 	    c_cchar)))
    104 		return(0);
    105 
    106 	arg = *++*argvp;
    107 	if (!arg) {
    108 		warnx("option requires an argument -- %s", name);
    109 		usage();
    110 	}
    111 
    112 #define CHK(s)  (*arg == s[0] && !strcmp(arg, s))
    113 	if (CHK("undef") || CHK("<undef>"))
    114 		ip->t.c_cc[cp->sub] = _POSIX_VDISABLE;
    115 	else if (cp->sub == VMIN || cp->sub == VTIME) {
    116 		val = strtol(arg, &ep, 10);
    117 		if (val == _POSIX_VDISABLE) {
    118 			warnx("value of %ld would disable the option -- %s",
    119 			    val, name);
    120 			usage();
    121 		}
    122 		if (val > UCHAR_MAX) {
    123 			warnx("maximum option value is %d -- %s",
    124 			    UCHAR_MAX, name);
    125 			usage();
    126 		}
    127 		if (*ep != '\0') {
    128 			warnx("option requires a numeric argument -- %s", name);
    129 			usage();
    130 		}
    131 		ip->t.c_cc[cp->sub] = val;
    132 	} else if (arg[0] == '^')
    133 		ip->t.c_cc[cp->sub] = (arg[1] == '?') ? 0177 :
    134 		    (arg[1] == '-') ? _POSIX_VDISABLE : arg[1] & 037;
    135 	else
    136 		ip->t.c_cc[cp->sub] = arg[0];
    137 	ip->set = 1;
    138 	return(1);
    139 }
    140 
    141 static
    142 c_cchar(a, b)
    143         const void *a, *b;
    144 {
    145         return(strcmp(((struct cchar *)a)->name, ((struct cchar *)b)->name));
    146 }
    147