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/* $OpenBSD: term.c,v 1.2 1996/06/26 05:41:57 deraadt Exp $ */
/* $NetBSD: term.c,v 1.6 1994/12/07 05:08:12 jtc Exp $ */
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)term.c 8.1 (Berkeley) 6/9/93";
#endif
static char rcsid[] = "$OpenBSD: term.c,v 1.2 1996/06/26 05:41:57 deraadt Exp $";
#endif /* not lint */
#include <sys/types.h>
#include <errno.h>
#include <ttyent.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "extern.h"
char tbuf[1024]; /* Termcap entry. */
char *askuser __P((char *));
char *ttys __P((char *));
/*
* Figure out what kind of terminal we're dealing with, and then read in
* its termcap entry.
*/
char *
get_termcap_entry(userarg, tcapbufp)
char *userarg, **tcapbufp;
{
struct ttyent *t;
int rval;
char *p, *ttype, *ttypath;
if (userarg) {
ttype = userarg;
goto found;
}
/* Try the environment. */
if (ttype = getenv("TERM"))
goto map;
/* Try ttyname(3); check for dialup or other mapping. */
if (ttypath = ttyname(STDERR_FILENO)) {
if (p = rindex(ttypath, '/'))
++p;
else
p = ttypath;
if ((t = getttynam(p))) {
ttype = t->ty_type;
goto map;
}
}
/* If still undefined, use "unknown". */
ttype = "unknown";
map: ttype = mapped(ttype);
/*
* If not a path, remove TERMCAP from the environment so we get a
* real entry from /etc/termcap. This prevents us from being fooled
* by out of date stuff in the environment.
*/
found: if ((p = getenv("TERMCAP")) != NULL && *p != '/')
unsetenv("TERMCAP");
/*
* ttype now contains a pointer to the type of the terminal.
* If the first character is '?', ask the user.
*/
if (ttype[0] == '?')
if (ttype[1] != '\0')
ttype = askuser(ttype + 1);
else
ttype = askuser(NULL);
/* Find the termcap entry. If it doesn't exist, ask the user. */
while ((rval = tgetent(tbuf, ttype)) == 0) {
(void)fprintf(stderr,
"tset: terminal type %s is unknown\n", ttype);
ttype = askuser(NULL);
}
if (rval == -1)
err("termcap: %s", strerror(errno ? errno : ENOENT));
*tcapbufp = tbuf;
return (ttype);
}
/* Prompt the user for a terminal type. */
char *
askuser(dflt)
char *dflt;
{
static char answer[256];
char *p;
/* We can get recalled; if so, don't continue uselessly. */
if (feof(stdin) || ferror(stdin)) {
(void)fprintf(stderr, "\n");
exit(1);
}
for (;;) {
if (dflt)
(void)fprintf(stderr, "Terminal type? [%s] ", dflt);
else
(void)fprintf(stderr, "Terminal type? ");
(void)fflush(stderr);
if (fgets(answer, sizeof(answer), stdin) == NULL) {
if (dflt == NULL) {
(void)fprintf(stderr, "\n");
exit(1);
}
return (dflt);
}
if (p = index(answer, '\n'))
*p = '\0';
if (answer[0])
return (answer);
if (dflt != NULL)
return (dflt);
}
}
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