1 /* $NetBSD: term.c,v 1.17 2011/09/06 18:34:12 joerg 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. 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 #ifndef lint 34 #if 0 35 static char sccsid[] = "@(#)term.c 8.1 (Berkeley) 6/9/93"; 36 #endif 37 __RCSID("$NetBSD: term.c,v 1.17 2011/09/06 18:34:12 joerg Exp $"); 38 #endif /* not lint */ 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 <term.h> 47 #include <ttyent.h> 48 #include <unistd.h> 49 #include "extern.h" 50 51 static const char *askuser(const char *); 52 53 /* 54 * Figure out what kind of terminal we're dealing with, and then read in 55 * its termcap entry. 56 */ 57 const char * 58 get_terminfo_entry(const char *userarg) 59 { 60 struct ttyent *t; 61 int rval; 62 char *p, *ttypath; 63 const char *ttype; 64 65 if (userarg) { 66 ttype = userarg; 67 goto found; 68 } 69 70 /* Try the environment. */ 71 if ((ttype = getenv("TERM")) != NULL) 72 goto map; 73 74 /* Try ttyname(3); check for dialup or other mapping. */ 75 if ((ttypath = ttyname(STDERR_FILENO)) != NULL) { 76 if ((p = strrchr(ttypath, '/')) != NULL) 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 found: 92 93 /* 94 * ttype now contains a pointer to the type of the terminal. 95 * If the first character is '?', ask the user. 96 */ 97 if (ttype[0] == '?') { 98 if (ttype[1] != '\0') 99 ttype = askuser(ttype + 1); 100 else 101 ttype = askuser(NULL); 102 } 103 104 while (setupterm(ttype, 0, &rval) == ERR) { 105 switch (rval) { 106 case 1: 107 warnx("terminal type %s is hardcopy", ttype); 108 break; 109 case 0: 110 warnx("terminal type %s is unknown", ttype); 111 break; 112 default: 113 if (!errno) 114 errno = ENOENT; 115 err(1, NULL); 116 } 117 ttype = askuser(NULL); 118 } 119 120 return (ttype); 121 } 122 123 /* Prompt the user for a terminal type. */ 124 static const char * 125 askuser(const char *dflt) 126 { 127 static char answer[256]; 128 char *p; 129 130 /* We can get recalled; if so, don't continue uselessly. */ 131 if (feof(stdin) || ferror(stdin)) { 132 (void)fprintf(stderr, "\n"); 133 exit(1); 134 } 135 for (;;) { 136 if (dflt) 137 (void)fprintf(stderr, "Terminal type? [%s] ", dflt); 138 else 139 (void)fprintf(stderr, "Terminal type? "); 140 (void)fflush(stderr); 141 142 if (fgets(answer, sizeof(answer), stdin) == NULL) { 143 if (dflt == NULL) { 144 (void)fprintf(stderr, "\n"); 145 exit(1); 146 } 147 return (dflt); 148 } 149 150 if ((p = strchr(answer, '\n')) != NULL) 151 *p = '\0'; 152 if (answer[0]) 153 return (answer); 154 if (dflt != NULL) 155 return (dflt); 156 } 157 } 158