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[] = "@(#)term.c 5.1 (Berkeley) 12/22/91"; 36 #endif /* not lint */ 37 38 #include <sys/types.h> 39 #include <errno.h> 40 #include <ttyent.h> 41 #include <unistd.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include "extern.h" 46 47 char tbuf[1024]; /* Termcap entry. */ 48 49 char *askuser __P((char *)); 50 char *ttys __P((char *)); 51 52 /* 53 * Figure out what kind of terminal we're dealing with, and then read in 54 * its termcap entry. 55 */ 56 char * 57 get_termcap_entry(userarg, tcapbufp) 58 char *userarg, **tcapbufp; 59 { 60 struct ttyent *t; 61 int rval; 62 char *base, *ttype, *ttypath; 63 64 if (userarg) { 65 ttype = userarg; 66 goto found; 67 } 68 69 /* Try the environment. */ 70 if (ttype = getenv("TERM")) 71 goto map; 72 73 /* Try ttyname(3); check for dialup or other mapping. */ 74 if (ttypath = ttyname(STDERR_FILENO)) { 75 if (base = rindex(ttypath, '/')) 76 ++base; 77 else 78 base = ttypath; 79 if ((t = getttynam(base))) { 80 ttype = t->ty_type; 81 goto map; 82 } 83 } 84 85 /* If still undefined, use "unknown". */ 86 ttype = "unknown"; 87 88 map: ttype = mapped(ttype); 89 90 /* 91 * Remove TERMCAP from the environment so we get a real entry from 92 * /etc/termcap. This prevents us from being fooled by out of date 93 * stuff in the environment. 94 */ 95 found: unsetenv("TERMCAP"); 96 97 /* 98 * ttype now contains a pointer to the type of the terminal. 99 * If the first character is '?', ask the user. 100 */ 101 if (ttype[0] == '?') 102 ttype = askuser(ttype + 1); 103 104 /* Find the termcap entry. If it doesn't exist, ask the user. */ 105 while ((rval = tgetent(tbuf, ttype)) == 0) { 106 (void)fprintf(stderr, 107 "tset: terminal type %s is unknown\n", ttype); 108 ttype = askuser(NULL); 109 } 110 if (rval == -1) 111 err("termcap: %s", strerror(errno ? errno : ENOENT)); 112 *tcapbufp = tbuf; 113 return (ttype); 114 } 115 116 /* Prompt the user for a terminal type. */ 117 char * 118 askuser(dflt) 119 char *dflt; 120 { 121 static char answer[256]; 122 char *p; 123 124 for (;;) { 125 if (dflt) 126 (void)fprintf(stderr, "Terminal type? [%s] ", dflt); 127 else 128 (void)fprintf(stderr, "Terminal type? "); 129 (void)fflush(stderr); 130 131 if (fgets(answer, sizeof(answer), stdin) == NULL) { 132 if (feof(stdin)) 133 clearerr(stdin); 134 continue; 135 } 136 137 if (p = index(answer, '\n')) 138 *p = '\0'; 139 return (answer[0] ? answer : dflt); 140 } 141 } 142