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