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term.c revision 1.12 
      1 /*	$NetBSD: term.c,v 1.12 1999/11/09 15:06:37 drochner Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1991, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)term.c	8.1 (Berkeley) 6/9/93";
     40 #endif
     41 __RCSID("$NetBSD: term.c,v 1.12 1999/11/09 15:06:37 drochner Exp $");
     42 #endif /* not lint */
     43 
     44 #include <sys/types.h>
     45 #include <err.h>
     46 #include <errno.h>
     47 #include <stdio.h>
     48 #include <stdlib.h>
     49 #include <string.h>
     50 #include <termcap.h>
     51 #include <ttyent.h>
     52 #include <unistd.h>
     53 #include "extern.h"
     54 
     55 char    tbuf[1024];      		/* Termcap entry. */
     56 
     57 const	char *askuser __P((const char *));
     58 char	*ttys __P((char *));
     59 
     60 /*
     61  * Figure out what kind of terminal we're dealing with, and then read in
     62  * its termcap entry.
     63  */
     64 const char *
     65 get_termcap_entry(userarg, tcapbufp)
     66 	const char *userarg;
     67 	char **tcapbufp;
     68 {
     69 	struct ttyent *t;
     70 	int rval;
     71 	char *p, *ttypath;
     72 	const char *ttype;
     73 
     74 	if (userarg) {
     75 		ttype = userarg;
     76 		goto found;
     77 	}
     78 
     79 	/* Try the environment. */
     80 	if ((ttype = getenv("TERM")) != NULL)
     81 		goto map;
     82 
     83 	/* Try ttyname(3); check for dialup or other mapping. */
     84 	if ((ttypath = ttyname(STDERR_FILENO)) != NULL) {
     85 		if ((p = strrchr(ttypath, '/')) != NULL)
     86 			++p;
     87 		else
     88 			p = ttypath;
     89 		if ((t = getttynam(p))) {
     90 			ttype = t->ty_type;
     91 			goto map;
     92 		}
     93 	}
     94 
     95 	/* If still undefined, use "unknown". */
     96 	ttype = "unknown";
     97 
     98 map:	ttype = mapped(ttype);
     99 
    100 	/*
    101 	 * If not a path, remove TERMCAP from the environment so we get a
    102 	 * real entry from /etc/termcap.  This prevents us from being fooled
    103 	 * by out of date stuff in the environment.
    104 	 */
    105 found:	if ((p = getenv("TERMCAP")) != NULL && *p != '/')
    106 		unsetenv("TERMCAP");
    107 
    108 	/*
    109 	 * ttype now contains a pointer to the type of the terminal.
    110 	 * If the first character is '?', ask the user.
    111 	 */
    112 	if (ttype[0] == '?') {
    113 		if (ttype[1] != '\0')
    114 			ttype = askuser(ttype + 1);
    115 		else
    116 			ttype = askuser(NULL);
    117 	}
    118 	/* Find the termcap entry.  If it doesn't exist, ask the user. */
    119 	while ((rval = tgetent(tbuf, ttype)) == 0) {
    120 		warnx("terminal type %s is unknown", ttype);
    121 		ttype = askuser(NULL);
    122 	}
    123 	if (rval == -1) {
    124 		if (!errno)
    125 			errno = ENOENT;
    126 		err(1, NULL);
    127 	}
    128 	*tcapbufp = tbuf;
    129 	return (ttype);
    130 }
    131 
    132 /* Prompt the user for a terminal type. */
    133 const char *
    134 askuser(dflt)
    135 	const char *dflt;
    136 {
    137 	static char answer[256];
    138 	char *p;
    139 
    140 	/* We can get recalled; if so, don't continue uselessly. */
    141 	if (feof(stdin) || ferror(stdin)) {
    142 		(void)fprintf(stderr, "\n");
    143 		exit(1);
    144 	}
    145 	for (;;) {
    146 		if (dflt)
    147 			(void)fprintf(stderr, "Terminal type? [%s] ", dflt);
    148 		else
    149 			(void)fprintf(stderr, "Terminal type? ");
    150 		(void)fflush(stderr);
    151 
    152 		if (fgets(answer, sizeof(answer), stdin) == NULL) {
    153 			if (dflt == NULL) {
    154 				(void)fprintf(stderr, "\n");
    155 				exit(1);
    156 			}
    157 			return (dflt);
    158 		}
    159 
    160 		if ((p = strchr(answer, '\n')) != NULL)
    161 			*p = '\0';
    162 		if (answer[0])
    163 			return (answer);
    164 		if (dflt != NULL)
    165 			return (dflt);
    166 	}
    167 }
    168