1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 34__FBSDID("$FreeBSD$"); 35 36#ifndef lint 37static const char sccsid[] = "@(#)term.c 8.1 (Berkeley) 6/9/93"; 38#endif 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 <termcap.h> 47#include <unistd.h> 48#include <ttyent.h> 49#include "extern.h" 50 51static char tbuf[1024]; /* Termcap entry. */ 52 53const char *askuser(const char *); 54char *ttys(char *); 55 56/* 57 * Figure out what kind of terminal we're dealing with, and then read in 58 * its termcap entry. 59 */ 60const char * 61get_termcap_entry(char *userarg, char **tcapbufp) 62{ 63 struct ttyent *t; 64 int rval; 65 char *p, *ttypath; 66 const char *ttype; 67 68 if (userarg) { 69 ttype = userarg; 70 goto found; 71 } 72 73 /* Try the environment. */ 74 if ((ttype = getenv("TERM"))) 75 goto map; 76 77 /* Try ttyname(3); check for dialup or other mapping. */ 78 if ((ttypath = ttyname(STDERR_FILENO))) { 79 if ((p = strrchr(ttypath, '/'))) 80 ++p; 81 else 82 p = ttypath; 83 if ((t = getttynam(p))) { 84 ttype = t->ty_type; 85 goto map; 86 } 87 } 88 89 /* If still undefined, use "unknown". */ 90 ttype = "unknown"; 91 92map: ttype = mapped(ttype); 93 94 /* 95 * If not a path, remove TERMCAP from the environment so we get a 96 * real entry from /etc/termcap. This prevents us from being fooled 97 * by out of date stuff in the environment. 98 */ 99found: if ((p = getenv("TERMCAP")) != NULL && *p != '/') 100 unsetenv("TERMCAP"); 101 102 /* 103 * ttype now contains a pointer to the type of the terminal. 104 * If the first character is '?', ask the user. 105 */ 106 if (ttype[0] == '?') { 107 if (ttype[1] != '\0') 108 ttype = askuser(ttype + 1); 109 else 110 ttype = askuser(NULL); 111 } 112 113 /* Find the termcap entry. If it doesn't exist, ask the user. */ 114 while ((rval = tgetent(tbuf, ttype)) == 0) { 115 warnx("terminal type %s is unknown", ttype); 116 ttype = askuser(NULL); 117 } 118 if (rval == -1) 119 errx(1, "termcap: %s", strerror(errno ? errno : ENOENT)); 120 *tcapbufp = tbuf; 121 return (ttype); 122} 123 124/* Prompt the user for a terminal type. */ 125const char * 126askuser(const char *dflt) 127{ 128 static char answer[256]; 129 char *p; 130 131 /* We can get recalled; if so, don't continue uselessly. */ 132 if (feof(stdin) || ferror(stdin)) { 133 (void)fprintf(stderr, "\n"); 134 exit(1); 135 } 136 for (;;) { 137 if (dflt) 138 (void)fprintf(stderr, "Terminal type? [%s] ", dflt); 139 else 140 (void)fprintf(stderr, "Terminal type? "); 141 (void)fflush(stderr); 142 143 if (fgets(answer, sizeof(answer), stdin) == NULL) { 144 if (dflt == NULL) { 145 (void)fprintf(stderr, "\n"); 146 exit(1); 147 } 148 return (dflt); 149 } 150 151 if ((p = strchr(answer, '\n'))) 152 *p = '\0'; 153 if (answer[0]) 154 return (answer); 155 if (dflt != NULL) 156 return (dflt); 157 } 158} 159