prettyness police

[unix-history] / usr / src / bin / stty / cchar.c

/*-
* Copyright (c) 1991, 1993
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)cchar.c     8.4 (Berkeley) %G%";
#endif /* not lint */

#include <sys/types.h>

#include <err.h>
#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>

#include "stty.h"
#include "extern.h"

/*
* Special control characters.
*
* Cchars1 are the standard names, cchars2 are the old aliases.
* The first are displayed, but both are recognized on the
* command line.
*/
struct cchar cchars1[] = {
       { "discard",    VDISCARD,       CDISCARD },
       { "dsusp",      VDSUSP,         CDSUSP },
       { "eof",        VEOF,           CEOF },
       { "eol",        VEOL,           CEOL },
       { "eol2",       VEOL2,          CEOL },
       { "erase",      VERASE,         CERASE },
       { "intr",       VINTR,          CINTR },
       { "kill",       VKILL,          CKILL },
       { "lnext",      VLNEXT,         CLNEXT },
       { "min",        VMIN,           CMIN },
       { "quit",       VQUIT,          CQUIT },
       { "reprint",    VREPRINT,       CREPRINT },
       { "start",      VSTART,         CSTART },
       { "status",     VSTATUS,        CSTATUS },
       { "stop",       VSTOP,          CSTOP },
       { "susp",       VSUSP,          CSUSP },
       { "time",       VTIME,          CTIME },
       { "werase",     VWERASE,        CWERASE },
       { NULL },
};

struct cchar cchars2[] = {
       { "brk",        VEOL,           CEOL },
       { "flush",      VDISCARD,       CDISCARD },
       { "rprnt",      VREPRINT,       CREPRINT },
       { NULL },
};

static int
c_cchar(a, b)
       const void *a, *b;
{

       return (strcmp(((struct cchar *)a)->name, ((struct cchar *)b)->name));
}

int
csearch(argvp, ip)
       char ***argvp;
       struct info *ip;
{
       struct cchar *cp, tmp;
       long val;
       char *arg, *ep, *name;
               
       name = **argvp;

       tmp.name = name;
       if (!(cp = (struct cchar *)bsearch(&tmp, cchars1,
           sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
           c_cchar)) && !(cp = (struct cchar *)bsearch(&tmp, cchars1,
           sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
           c_cchar)))
               return (0);

       arg = *++*argvp;
       if (!arg) {
               warnx("option requires an argument -- %s", name);
               usage();
       }

#define CHK(s)  (*arg == s[0] && !strcmp(arg, s))
       if (CHK("undef") || CHK("<undef>"))
               ip->t.c_cc[cp->sub] = _POSIX_VDISABLE;
       else if (cp->sub == VMIN || cp->sub == VTIME) {
               val = strtol(arg, &ep, 10);
               if (val == _POSIX_VDISABLE) {
                       warnx("value of %ld would disable the option -- %s",
                           val, name);
                       usage();
               }
               if (val > UCHAR_MAX) {
                       warnx("maximum option value is %d -- %s",
                           UCHAR_MAX, name);
                       usage();
               }
               if (*ep != '\0') {
                       warnx("option requires a numeric argument -- %s", name);
                       usage();
               }
               ip->t.c_cc[cp->sub] = val;
       } else if (arg[0] == '^')
               ip->t.c_cc[cp->sub] = (arg[1] == '?') ? 0177 :
                   (arg[1] == '-') ? _POSIX_VDISABLE : arg[1] & 037;
       else
               ip->t.c_cc[cp->sub] = arg[0];
       ip->set = 1;
       return (1);
}