[unix-history] / usr.bin / tset / term.c

/*-
 * Copyright (c) 1991 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
static char sccsid[] = "@(#)term.c	5.5 (Berkeley) 5/11/92";
#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);
	}
}
Commit	Line	Data
15637ed4 RG	1	/*-
	2	* Copyright (c) 1991 The Regents of the University of California.
	3	* 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
ca31a92e	35	static char sccsid[] = "@(#)term.c 5.5 (Berkeley) 5/11/92";
15637ed4 RG	36	#endif /* not lint */
	37
	38	#include <sys/types.h>
	39	#include <errno.h>
	40	#include <ttyent.h>
	41	#include <unistd.h>
	42	#include <stdio.h>
	43	#include <stdlib.h>
	44	#include <string.h>
	45	#include "extern.h"
	46
	47	char tbuf[1024]; /* Termcap entry. */
	48
	49	char askuser __P((char ));
	50	char ttys __P((char ));
	51
	52	/*
	53	* Figure out what kind of terminal we're dealing with, and then read in
	54	* its termcap entry.
	55	*/
	56	char *
	57	get_termcap_entry(userarg, tcapbufp)
	58	char userarg, *tcapbufp;
	59	{
	60	struct ttyent *t;
	61	int rval;
ca31a92e	62	char p, ttype, *ttypath;
15637ed4 RG	63
	64	if (userarg) {
	65	ttype = userarg;
	66	goto found;
	67	}
	68
	69	/* Try the environment. */
	70	if (ttype = getenv("TERM"))
	71	goto map;
	72
	73	/* Try ttyname(3); check for dialup or other mapping. */
	74	if (ttypath = ttyname(STDERR_FILENO)) {
ca31a92e NW	75	if (p = rindex(ttypath, '/'))
ca31a92e NW	76	++p;
15637ed4	77	else
ca31a92e NW	78	p = ttypath;
ca31a92e NW	79	if ((t = getttynam(p))) {
15637ed4 RG	80	ttype = t->ty_type;
	81	goto map;
	82	}
	83	}
	84
	85	/* If still undefined, use "unknown". */
	86	ttype = "unknown";
	87
	88	map: ttype = mapped(ttype);
	89
	90	/*
ca31a92e NW	91	* If not a path, remove TERMCAP from the environment so we get a
	92	* real entry from /etc/termcap. This prevents us from being fooled
	93	* by out of date stuff in the environment.
15637ed4	94	*/
ca31a92e NW	95	found: if ((p = getenv("TERMCAP")) != NULL && *p != '/')
ca31a92e NW	96	unsetenv("TERMCAP");
15637ed4 RG	97
	98	/*
	99	* ttype now contains a pointer to the type of the terminal.
	100	* If the first character is '?', ask the user.
	101	*/
	102	if (ttype[0] == '?')
ca31a92e NW	103	if (ttype[1] != '\0')
	104	ttype = askuser(ttype + 1);
	105	else
	106	ttype = askuser(NULL);
15637ed4 RG	107
	108	/* Find the termcap entry. If it doesn't exist, ask the user. */
	109	while ((rval = tgetent(tbuf, ttype)) == 0) {
	110	(void)fprintf(stderr,
	111	"tset: terminal type %s is unknown\n", ttype);
	112	ttype = askuser(NULL);
	113	}
	114	if (rval == -1)
	115	err("termcap: %s", strerror(errno ? errno : ENOENT));
	116	*tcapbufp = tbuf;
	117	return (ttype);
	118	}
	119
	120	/* Prompt the user for a terminal type. */
	121	char *
	122	askuser(dflt)
	123	char *dflt;
	124	{
	125	static char answer[256];
	126	char *p;
	127
ca31a92e NW	128	/* We can get recalled; if so, don't continue uselessly. */
	129	if (feof(stdin) \|\| ferror(stdin)) {
	130	(void)fprintf(stderr, "\n");
	131	exit(1);
	132	}
15637ed4 RG	133	for (;;) {
	134	if (dflt)
	135	(void)fprintf(stderr, "Terminal type? [%s] ", dflt);
	136	else
	137	(void)fprintf(stderr, "Terminal type? ");
	138	(void)fflush(stderr);
	139
ca31a92e NW	140	if (fgets(answer, sizeof(answer), stdin) == NULL) {
	141	if (dflt == NULL) {
	142	(void)fprintf(stderr, "\n");
	143	exit(1);
	144	}
	145	return (dflt);
	146	}
15637ed4 RG	147
	148	if (p = index(answer, '\n'))
	149	*p = '\0';
ca31a92e NW	150	if (answer[0])
	151	return (answer);
	152	if (dflt != NULL)
	153	return (dflt);
15637ed4 RG	154	}
15637ed4 RG	155	}