1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 /*static char sccsid[] = "from: @(#)term.c 5.5 (Berkeley) 5/11/92";*/ 36 static char rcsid[] = "$Id: term.c,v 1.5 1993/08/01 18:04:23 mycroft Exp $"; 37 #endif /* not lint */ 38 39 #include <sys/types.h> 40 #include <errno.h> 41 #include <ttyent.h> 42 #include <unistd.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include "extern.h" 47 48 char tbuf[1024]; /* Termcap entry. */ 49 50 char *askuser __P((char *)); 51 char *ttys __P((char *)); 52 53 /* 54 * Figure out what kind of terminal we're dealing with, and then read in 55 * its termcap entry. 56 */ 57 char * 58 get_termcap_entry(userarg, tcapbufp) 59 char *userarg, **tcapbufp; 60 { 61 struct ttyent *t; 62 int rval; 63 char *p, *ttype, *ttypath; 64 65 if (userarg) { 66 ttype = userarg; 67 goto found; 68 } 69 70 /* Try the environment. */ 71 if (ttype = getenv("TERM")) 72 goto map; 73 74 /* Try ttyname(3); check for dialup or other mapping. */ 75 if (ttypath = ttyname(STDERR_FILENO)) { 76 if (p = rindex(ttypath, '/')) 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 /* 92 * If not a path, remove TERMCAP from the environment so we get a 93 * real entry from /etc/termcap. This prevents us from being fooled 94 * by out of date stuff in the environment. 95 */ 96 found: if ((p = getenv("TERMCAP")) != NULL && *p != '/') 97 unsetenv("TERMCAP"); 98 99 /* 100 * ttype now contains a pointer to the type of the terminal. 101 * If the first character is '?', ask the user. 102 */ 103 if (ttype[0] == '?') 104 if (ttype[1] != '\0') 105 ttype = askuser(ttype + 1); 106 else 107 ttype = askuser(NULL); 108 109 /* Find the termcap entry. If it doesn't exist, ask the user. */ 110 while ((rval = tgetent(tbuf, ttype)) == 0) { 111 (void)fprintf(stderr, 112 "tset: terminal type %s is unknown\n", ttype); 113 ttype = askuser(NULL); 114 } 115 if (rval == -1) 116 err("termcap: %s", strerror(errno ? errno : ENOENT)); 117 *tcapbufp = tbuf; 118 return (ttype); 119 } 120 121 /* Prompt the user for a terminal type. */ 122 char * 123 askuser(dflt) 124 char *dflt; 125 { 126 static char answer[256]; 127 char *p; 128 129 /* We can get recalled; if so, don't continue uselessly. */ 130 if (feof(stdin) || ferror(stdin)) { 131 (void)fprintf(stderr, "\n"); 132 exit(1); 133 } 134 for (;;) { 135 if (dflt) 136 (void)fprintf(stderr, "Terminal type? [%s] ", dflt); 137 else 138 (void)fprintf(stderr, "Terminal type? "); 139 (void)fflush(stderr); 140 141 if (fgets(answer, sizeof(answer), stdin) == NULL) { 142 if (dflt == NULL) { 143 (void)fprintf(stderr, "\n"); 144 exit(1); 145 } 146 return (dflt); 147 } 148 149 if (p = index(answer, '\n')) 150 *p = '\0'; 151 if (answer[0]) 152 return (answer); 153 if (dflt != NULL) 154 return (dflt); 155 } 156 } 157