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      1 /*	$NetBSD: term.c,v 1.17 2011/09/06 18:34:12 joerg 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. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)term.c	8.1 (Berkeley) 6/9/93";
     36 #endif
     37 __RCSID("$NetBSD: term.c,v 1.17 2011/09/06 18:34:12 joerg Exp $");
     38 #endif /* not lint */
     39 
     40 #include <sys/types.h>
     41 #include <err.h>
     42 #include <errno.h>
     43 #include <stdio.h>
     44 #include <stdlib.h>
     45 #include <string.h>
     46 #include <term.h>
     47 #include <ttyent.h>
     48 #include <unistd.h>
     49 #include "extern.h"
     50 
     51 static const	char *askuser(const char *);
     52 
     53 /*
     54  * Figure out what kind of terminal we're dealing with, and then read in
     55  * its termcap entry.
     56  */
     57 const char *
     58 get_terminfo_entry(const char *userarg)
     59 {
     60 	struct ttyent *t;
     61 	int rval;
     62 	char *p, *ttypath;
     63 	const char *ttype;
     64 
     65 	if (userarg) {
     66 		ttype = userarg;
     67 		goto found;
     68 	}
     69 
     70 	/* Try the environment. */
     71 	if ((ttype = getenv("TERM")) != NULL)
     72 		goto map;
     73 
     74 	/* Try ttyname(3); check for dialup or other mapping. */
     75 	if ((ttypath = ttyname(STDERR_FILENO)) != NULL) {
     76 		if ((p = strrchr(ttypath, '/')) != NULL)
     77 			++p;
     78 		else
     79 			p = ttypath;
     80 		if ((t = getttynam(p))) {
     81 			ttype = t->ty_type;
     82 			goto map;
     83 		}
     84 	}
     85 
     86 	/* If still undefined, use "unknown". */
     87 	ttype = "unknown";
     88 
     89 map:	ttype = mapped(ttype);
     90 
     91 found:
     92 
     93 	/*
     94 	 * ttype now contains a pointer to the type of the terminal.
     95 	 * If the first character is '?', ask the user.
     96 	 */
     97 	if (ttype[0] == '?') {
     98 		if (ttype[1] != '\0')
     99 			ttype = askuser(ttype + 1);
    100 		else
    101 			ttype = askuser(NULL);
    102 	}
    103 
    104 	while (setupterm(ttype, 0, &rval) == ERR) {
    105 		switch (rval) {
    106 		case 1:
    107 			warnx("terminal type %s is hardcopy", ttype);
    108 			break;
    109 		case 0:
    110 			warnx("terminal type %s is unknown", ttype);
    111 			break;
    112 		default:
    113 			if (!errno)
    114 				errno = ENOENT;
    115 			err(1, NULL);
    116 		}
    117 		ttype = askuser(NULL);
    118 	}
    119 
    120 	return (ttype);
    121 }
    122 
    123 /* Prompt the user for a terminal type. */
    124 static const char *
    125 askuser(const char *dflt)
    126 {
    127 	static char answer[256];
    128 	char *p;
    129 
    130 	/* We can get recalled; if so, don't continue uselessly. */
    131 	if (feof(stdin) || ferror(stdin)) {
    132 		(void)fprintf(stderr, "\n");
    133 		exit(1);
    134 	}
    135 	for (;;) {
    136 		if (dflt)
    137 			(void)fprintf(stderr, "Terminal type? [%s] ", dflt);
    138 		else
    139 			(void)fprintf(stderr, "Terminal type? ");
    140 		(void)fflush(stderr);
    141 
    142 		if (fgets(answer, sizeof(answer), stdin) == NULL) {
    143 			if (dflt == NULL) {
    144 				(void)fprintf(stderr, "\n");
    145 				exit(1);
    146 			}
    147 			return (dflt);
    148 		}
    149 
    150 		if ((p = strchr(answer, '\n')) != NULL)
    151 			*p = '\0';
    152 		if (answer[0])
    153 			return (answer);
    154 		if (dflt != NULL)
    155 			return (dflt);
    156 	}
    157 }
    158