1 /* $NetBSD: term.c,v 1.6 1994/12/07 05:08:12 jtc 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 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)term.c 8.1 (Berkeley) 6/9/93"; 39 #endif 40 static char rcsid[] = "$NetBSD: term.c,v 1.6 1994/12/07 05:08:12 jtc Exp $"; 41 #endif /* not lint */ 42 43 #include <sys/types.h> 44 #include <errno.h> 45 #include <ttyent.h> 46 #include <unistd.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include "extern.h" 51 52 char tbuf[1024]; /* Termcap entry. */ 53 54 char *askuser __P((char *)); 55 char *ttys __P((char *)); 56 57 /* 58 * Figure out what kind of terminal we're dealing with, and then read in 59 * its termcap entry. 60 */ 61 char * 62 get_termcap_entry(userarg, tcapbufp) 63 char *userarg, **tcapbufp; 64 { 65 struct ttyent *t; 66 int rval; 67 char *p, *ttype, *ttypath; 68 69 if (userarg) { 70 ttype = userarg; 71 goto found; 72 } 73 74 /* Try the environment. */ 75 if (ttype = getenv("TERM")) 76 goto map; 77 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 93 map: 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 */ 100 found: 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 /* Find the termcap entry. If it doesn't exist, ask the user. */ 114 while ((rval = tgetent(tbuf, ttype)) == 0) { 115 (void)fprintf(stderr, 116 "tset: terminal type %s is unknown\n", ttype); 117 ttype = askuser(NULL); 118 } 119 if (rval == -1) 120 err("termcap: %s", strerror(errno ? errno : ENOENT)); 121 *tcapbufp = tbuf; 122 return (ttype); 123 } 124 125 /* Prompt the user for a terminal type. */ 126 char * 127 askuser(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