term.c revision 48566
1/*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. 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#if 0 36static char sccsid[] = "@(#)term.c 8.1 (Berkeley) 6/9/93"; 37#endif 38static const char rcsid[] = 39 "$Id: term.c,v 1.2 1997/08/18 07:27:56 charnier Exp $"; 40#endif /* not lint */ 41 42#include <sys/types.h> 43#include <err.h> 44#include <errno.h> 45#include <stdio.h> 46#include <stdlib.h> 47#include <string.h> 48#include <unistd.h> 49#include <ttyent.h> 50#include "extern.h" 51 52char tbuf[1024]; /* Termcap entry. */ 53 54char *askuser __P((char *)); 55char *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 */ 61char * 62get_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 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