bin/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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)cchar.c  8.5 (Berkeley) 4/2/94
  30  * $FreeBSD: src/bin/stty/cchar.c,v 1.9.2.2 2001/07/04 22:40:00 kris Exp $
  31  * $DragonFly: src/bin/stty/cchar.c,v 1.5 2003/10/13 21:24:26 dillon Exp $
  32  */
  33
  34 #include <sys/types.h>
  35
  36 #include <err.h>
  37 #include <limits.h>
  38 #include <stddef.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41
  42 #include "stty.h"
  43 #include "extern.h"
  44
  45 static int c_cchar (const void *, const void *);
  46
  47 /*
  48  * Special control characters.
  49  *
  50  * Cchars1 are the standard names, cchars2 are the old aliases.
  51  * The first are displayed, but both are recognized on the
  52  * command line.
  53  */
  54 struct cchar cchars1[] = {
  55         { "ckpt",       VCHECKPT,       CCHECKPT },
  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         { "erase2",     VERASE2,        CERASE2 },
  63         { "intr",       VINTR,          CINTR },
  64         { "kill",       VKILL,          CKILL },
  65         { "lnext",      VLNEXT,         CLNEXT },
  66         { "min",        VMIN,           CMIN },
  67         { "quit",       VQUIT,          CQUIT },
  68         { "reprint",    VREPRINT,       CREPRINT },
  69         { "start",      VSTART,         CSTART },
  70         { "status",     VSTATUS,        CSTATUS },
  71         { "stop",       VSTOP,          CSTOP },
  72         { "susp",       VSUSP,          CSUSP },
  73         { "time",       VTIME,          CTIME },
  74         { "werase",     VWERASE,        CWERASE },
  75         { NULL,         0,              0},
  76 };
  77
  78 struct cchar cchars2[] = {
  79         { "brk",        VEOL,           CEOL },
  80         { "flush",      VDISCARD,       CDISCARD },
  81         { "rprnt",      VREPRINT,       CREPRINT },
  82         { NULL,         0,              0 },
  83 };
  84
  85 static int
  86 c_cchar(const void *a, const void *b)
  87 {
  88
  89         return (strcmp(((const struct cchar *)a)->name, ((const struct cchar *)b)->name));
  90 }
  91
  92 int
  93 csearch(char ***argvp, struct info *ip)
  94 {
  95         struct cchar *cp, tmp;
  96         long val;
  97         char *arg, *ep, *name;
  98
  99         name = **argvp;
 100
 101         tmp.name = name;
 102         if (!(cp = (struct cchar *)bsearch(&tmp, cchars1,
 103             sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
 104             c_cchar)) && !(cp = (struct cchar *)bsearch(&tmp, cchars2,
 105             sizeof(cchars2)/sizeof(struct cchar) - 1, sizeof(struct cchar),
 106             c_cchar)))
 107                 return (0);
 108
 109         arg = *++*argvp;
 110         if (!arg) {
 111                 warnx("option requires an argument -- %s", name);
 112                 usage();
 113         }
 114
 115 #define CHK(s)  (*arg == s[0] && !strcmp(arg, s))
 116         if (CHK("undef") || CHK("<undef>"))
 117                 ip->t.c_cc[cp->sub] = _POSIX_VDISABLE;
 118         else if (cp->sub == VMIN || cp->sub == VTIME) {
 119                 val = strtol(arg, &ep, 10);
 120                 if (val > UCHAR_MAX) {
 121                         warnx("maximum option value is %d -- %s",
 122                             UCHAR_MAX, name);
 123                         usage();
 124                 }
 125                 if (*ep != '\0') {
 126                         warnx("option requires a numeric argument -- %s", name);
 127                         usage();
 128                 }
 129                 ip->t.c_cc[cp->sub] = val;
 130         } else if (arg[0] == '^')
 131                 ip->t.c_cc[cp->sub] = (arg[1] == '?') ? 0177 :
 132                     (arg[1] == '-') ? _POSIX_VDISABLE : arg[1] & 037;
 133         else
 134                 ip->t.c_cc[cp->sub] = arg[0];
 135         ip->set = 1;
 136         return (1);
 137 }