adv_cmds/stty/cchar.c

   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
  36 static char sccsid[] = "@(#)cchar.c     8.5 (Berkeley) 4/2/94";
  37 #endif
  38 #endif /* not lint */
  39 #include <sys/cdefs.h>
  40 __RCSID("$FreeBSD: src/bin/stty/cchar.c,v 1.13 2002/06/30 05:15:04 obrien Exp $");
  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
  53 static int c_cchar(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  */
  62 struct 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 #ifndef __APPLE__
  70         { "erase2",     VERASE2,        CERASE2 },
  71 #endif
  72         { "intr",       VINTR,          CINTR },
  73         { "kill",       VKILL,          CKILL },
  74         { "lnext",      VLNEXT,         CLNEXT },
  75         { "min",        VMIN,           CMIN },
  76         { "quit",       VQUIT,          CQUIT },
  77         { "reprint",    VREPRINT,       CREPRINT },
  78         { "start",      VSTART,         CSTART },
  79         { "status",     VSTATUS,        CSTATUS },
  80         { "stop",       VSTOP,          CSTOP },
  81         { "susp",       VSUSP,          CSUSP },
  82         { "time",       VTIME,          CTIME },
  83         { "werase",     VWERASE,        CWERASE },
  84         { NULL,         0,              0},
  85 };
  86
  87 struct cchar cchars2[] = {
  88         { "brk",        VEOL,           CEOL },
  89         { "flush",      VDISCARD,       CDISCARD },
  90         { "rprnt",      VREPRINT,       CREPRINT },
  91         { NULL,         0,              0 },
  92 };
  93
  94 static int
  95 c_cchar(const void *a, const void *b)
  96 {
  97
  98         return (strcmp(((const struct cchar *)a)->name, ((const struct cchar *)b)->name));
  99 }
 100
 101 int
 102 csearch(char ***argvp, struct info *ip)
 103 {
 104         struct cchar *cp, tmp;
 105         long val;
 106         char *arg, *ep, *name;
 107
 108         name = **argvp;
 109
 110         tmp.name = name;
 111         if (!(cp = (struct cchar *)bsearch(&tmp, cchars1,
 112             sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
 113             c_cchar)) && !(cp = (struct cchar *)bsearch(&tmp, cchars2,
 114             sizeof(cchars2)/sizeof(struct cchar) - 1, sizeof(struct cchar),
 115             c_cchar)))
 116                 return (0);
 117
 118         arg = *++*argvp;
 119         if (!arg) {
 120                 warnx("option requires an argument -- %s", name);
 121                 usage();
 122         }
 123
 124 #define CHK(s)  (*arg == s[0] && !strcmp(arg, s))
 125         if (CHK("undef") || CHK("<undef>"))
 126                 ip->t.c_cc[cp->sub] = _POSIX_VDISABLE;
 127         else if (cp->sub == VMIN || cp->sub == VTIME) {
 128                 val = strtol(arg, &ep, 10);
 129 #ifdef __APPLE__
 130                 if (val == _POSIX_VDISABLE) {
 131                         warnx("value of %ld would disable the option -- %s",
 132                             val, name);
 133                         usage();
 134                 }
 135 #endif
 136                 if (val > UCHAR_MAX) {
 137                         warnx("maximum option value is %d -- %s",
 138                             UCHAR_MAX, name);
 139                         usage();
 140                 }
 141                 if (*ep != '\0') {
 142                         warnx("option requires a numeric argument -- %s", name);
 143                         usage();
 144                 }
 145                 ip->t.c_cc[cp->sub] = val;
 146         } else if (arg[0] == '^')
 147                 ip->t.c_cc[cp->sub] = (arg[1] == '?') ? 0177 :
 148                     (arg[1] == '-') ? _POSIX_VDISABLE : arg[1] & 037;
 149         else
 150                 ip->t.c_cc[cp->sub] = arg[0];
 151         ip->set = 1;
 152         return (1);
 153 }