term.c revision 50477
1110827Sphantom/*- 2110827Sphantom * Copyright (c) 1991, 1993 3110827Sphantom * The Regents of the University of California. All rights reserved. 4110827Sphantom * 5110827Sphantom * Redistribution and use in source and binary forms, with or without 6110827Sphantom * modification, are permitted provided that the following conditions 7110827Sphantom * are met: 8110827Sphantom * 1. Redistributions of source code must retain the above copyright 9110827Sphantom * notice, this list of conditions and the following disclaimer. 10110827Sphantom * 2. Redistributions in binary form must reproduce the above copyright 11110827Sphantom * notice, this list of conditions and the following disclaimer in the 12110827Sphantom * documentation and/or other materials provided with the distribution. 13110827Sphantom * 3. All advertising materials mentioning features or use of this software 14110827Sphantom * must display the following acknowledgement: 15110827Sphantom * This product includes software developed by the University of 16110827Sphantom * California, Berkeley and its contributors. 17110827Sphantom * 4. Neither the name of the University nor the names of its contributors 18110827Sphantom * may be used to endorse or promote products derived from this software 19110827Sphantom * without specific prior written permission. 20110827Sphantom * 21110827Sphantom * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22110827Sphantom * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23110827Sphantom * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24110827Sphantom * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25110827Sphantom * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26110827Sphantom * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27299115Skib * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28110827Sphantom * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29110827Sphantom * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30110827Sphantom * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31110827Sphantom * SUCH DAMAGE. 32110827Sphantom */ 33110827Sphantom 34124535Sru#ifndef lint 35110827Sphantom#if 0 36110827Sphantomstatic char sccsid[] = "@(#)term.c 8.1 (Berkeley) 6/9/93"; 37110827Sphantom#endif 38110827Sphantomstatic const char rcsid[] = 39110827Sphantom "$FreeBSD: head/usr.bin/tset/term.c 50477 1999-08-28 01:08:13Z peter $"; 40110827Sphantom#endif /* not lint */ 41110827Sphantom 42111447Sru#include <sys/types.h> 43299115Skib#include <err.h> 44299115Skib#include <errno.h> 45299115Skib#include <stdio.h> 46299115Skib#include <stdlib.h> 47299115Skib#include <string.h> 48299115Skib#include <unistd.h> 49299115Skib#include <ttyent.h> 50110827Sphantom#include "extern.h" 51110827Sphantom 52110827Sphantomchar tbuf[1024]; /* Termcap entry. */ 53110827Sphantom 54110827Sphantomchar *askuser __P((char *)); 55110827Sphantomchar *ttys __P((char *)); 56110827Sphantom 57110827Sphantom/* 58110827Sphantom * Figure out what kind of terminal we're dealing with, and then read in 59111447Sru * its termcap entry. 60110827Sphantom */ 61111447Sruchar * 62110827Sphantomget_termcap_entry(userarg, tcapbufp) 63111447Sru char *userarg, **tcapbufp; 64110827Sphantom{ 65111447Sru struct ttyent *t; 66301076Sjilles int rval; 67111447Sru char *p, *ttype, *ttypath; 68110827Sphantom 69110827Sphantom if (userarg) { 70110827Sphantom ttype = userarg; 71110827Sphantom goto found; 72110827Sphantom } 73110827Sphantom 74110827Sphantom /* Try the environment. */ 75110827Sphantom if ((ttype = getenv("TERM"))) 76111447Sru goto map; 77267776Sbapt 78 /* Try ttyname(3); check for dialup or other mapping. */ 79 if ((ttypath = ttyname(STDERR_FILENO))) { 80 if ((p = rindex(ttypath, '/'))) 81 ++p; 82 else 83 p = ttypath; 84 if ((t = getttynam(p))) { 85 ttype = t->ty_type; 86 goto map; 87 } 88 } 89 90 /* If still undefined, use "unknown". */ 91 ttype = "unknown"; 92 93map: ttype = mapped(ttype); 94 95 /* 96 * If not a path, remove TERMCAP from the environment so we get a 97 * real entry from /etc/termcap. This prevents us from being fooled 98 * by out of date stuff in the environment. 99 */ 100found: if ((p = getenv("TERMCAP")) != NULL && *p != '/') 101 unsetenv("TERMCAP"); 102 103 /* 104 * ttype now contains a pointer to the type of the terminal. 105 * If the first character is '?', ask the user. 106 */ 107 if (ttype[0] == '?') { 108 if (ttype[1] != '\0') 109 ttype = askuser(ttype + 1); 110 else 111 ttype = askuser(NULL); 112 } 113 114 /* Find the termcap entry. If it doesn't exist, ask the user. */ 115 while ((rval = tgetent(tbuf, ttype)) == 0) { 116 warnx("terminal type %s is unknown", ttype); 117 ttype = askuser(NULL); 118 } 119 if (rval == -1) 120 errx(1, "termcap: %s", strerror(errno ? errno : ENOENT)); 121 *tcapbufp = tbuf; 122 return (ttype); 123} 124 125/* Prompt the user for a terminal type. */ 126char * 127askuser(dflt) 128 char *dflt; 129{ 130 static char answer[256]; 131 char *p; 132 133 /* We can get recalled; if so, don't continue uselessly. */ 134 if (feof(stdin) || ferror(stdin)) { 135 (void)fprintf(stderr, "\n"); 136 exit(1); 137 } 138 for (;;) { 139 if (dflt) 140 (void)fprintf(stderr, "Terminal type? [%s] ", dflt); 141 else 142 (void)fprintf(stderr, "Terminal type? "); 143 (void)fflush(stderr); 144 145 if (fgets(answer, sizeof(answer), stdin) == NULL) { 146 if (dflt == NULL) { 147 (void)fprintf(stderr, "\n"); 148 exit(1); 149 } 150 return (dflt); 151 } 152 153 if ((p = index(answer, '\n'))) 154 *p = '\0'; 155 if (answer[0]) 156 return (answer); 157 if (dflt != NULL) 158 return (dflt); 159 } 160} 161