Home | History | Annotate | Line # | Download | only in stty
cchar.c revision 1.8 
      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 /*static char sccsid[] = "from: @(#)cchar.c	8.5 (Berkeley) 4/2/94";*/
     36 static char *rcsid = "$Id: cchar.c,v 1.8 1994/09/20 04:52:03 mycroft Exp $";
     37 #endif /* not lint */
     38 
     39 #include <sys/types.h>
     40 
     41 #include <err.h>
     42 #include <limits.h>
     43 #include <stddef.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 
     47 #include "stty.h"
     48 #include "extern.h"
     49 
     50 /*
     51  * Special control characters.
     52  *
     53  * Cchars1 are the standard names, cchars2 are the old aliases.
     54  * The first are displayed, but both are recognized on the
     55  * command line.
     56  */
     57 struct cchar cchars1[] = {
     58 	{ "discard",	VDISCARD, 	CDISCARD },
     59 	{ "dsusp", 	VDSUSP,		CDSUSP },
     60 	{ "eof",	VEOF,		CEOF },
     61 	{ "eol",	VEOL,		CEOL },
     62 	{ "eol2",	VEOL2,		CEOL },
     63 	{ "erase",	VERASE,		CERASE },
     64 	{ "intr",	VINTR,		CINTR },
     65 	{ "kill",	VKILL,		CKILL },
     66 	{ "lnext",	VLNEXT,		CLNEXT },
     67 	{ "min",	VMIN,		CMIN },
     68 	{ "quit",	VQUIT,		CQUIT },
     69 	{ "reprint",	VREPRINT, 	CREPRINT },
     70 	{ "start",	VSTART,		CSTART },
     71 	{ "status",	VSTATUS, 	CSTATUS },
     72 	{ "stop",	VSTOP,		CSTOP },
     73 	{ "susp",	VSUSP,		CSUSP },
     74 	{ "time",	VTIME,		CTIME },
     75 	{ "werase",	VWERASE,	CWERASE },
     76 	{ NULL },
     77 };
     78 
     79 struct cchar cchars2[] = {
     80 	{ "brk",	VEOL,		CEOL },
     81 	{ "flush",	VDISCARD, 	CDISCARD },
     82 	{ "rprnt",	VREPRINT, 	CREPRINT },
     83 	{ NULL },
     84 };
     85 
     86 static int
     87 c_cchar(a, b)
     88         const void *a, *b;
     89 {
     90 
     91         return (strcmp(((struct cchar *)a)->name, ((struct cchar *)b)->name));
     92 }
     93 
     94 int
     95 csearch(argvp, ip)
     96 	char ***argvp;
     97 	struct info *ip;
     98 {
     99 	struct cchar *cp, tmp;
    100 	long val;
    101 	char *arg, *ep, *name;
    102 
    103 	name = **argvp;
    104 
    105 	tmp.name = name;
    106 	if (!(cp = (struct cchar *)bsearch(&tmp, cchars1,
    107 	    sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
    108 	    c_cchar)) && !(cp = (struct cchar *)bsearch(&tmp, cchars1,
    109 	    sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
    110 	    c_cchar)))
    111 		return (0);
    112 
    113 	arg = *++*argvp;
    114 	if (!arg) {
    115 		warnx("option requires an argument -- %s", name);
    116 		usage();
    117 	}
    118 
    119 #define CHK(s)  (*arg == s[0] && !strcmp(arg, s))
    120 	if (CHK("undef") || CHK("<undef>"))
    121 		ip->t.c_cc[cp->sub] = _POSIX_VDISABLE;
    122 	else if (cp->sub == VMIN || cp->sub == VTIME) {
    123 		val = strtol(arg, &ep, 10);
    124 		if (val == _POSIX_VDISABLE) {
    125 			warnx("value of %ld would disable the option -- %s",
    126 			    val, name);
    127 			usage();
    128 		}
    129 		if (val > UCHAR_MAX) {
    130 			warnx("maximum option value is %d -- %s",
    131 			    UCHAR_MAX, name);
    132 			usage();
    133 		}
    134 		if (*ep != '\0') {
    135 			warnx("option requires a numeric argument -- %s", name);
    136 			usage();
    137 		}
    138 		ip->t.c_cc[cp->sub] = val;
    139 	} else if (arg[0] == '^')
    140 		ip->t.c_cc[cp->sub] = (arg[1] == '?') ? 0177 :
    141 		    (arg[1] == '-') ? _POSIX_VDISABLE : arg[1] & 037;
    142 	else
    143 		ip->t.c_cc[cp->sub] = arg[0];
    144 	ip->set = 1;
    145 	return (1);
    146 }
    147