1 /* $NetBSD: term.c,v 1.16 2010/02/03 15:34:46 roy 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 1.16 2010/02/03 15:34:46 roy 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 char *tbuf; /* Termcap entry. */ 52 53 const char *askuser __P((const char *)); 54 char *ttys __P((char *)); 55 56 /* 57 * Figure out what kind of terminal we're dealing with, and then read in 58 * its termcap entry. 59 */ 60 const char * 61 get_terminfo_entry(const char *userarg) 62 { 63 struct ttyent *t; 64 int rval; 65 char *p, *ttypath; 66 const char *ttype; 67 68 if (userarg) { 69 ttype = userarg; 70 goto found; 71 } 72 73 /* Try the environment. */ 74 if ((ttype = getenv("TERM")) != NULL) 75 goto map; 76 77 /* Try ttyname(3); check for dialup or other mapping. */ 78 if ((ttypath = ttyname(STDERR_FILENO)) != NULL) { 79 if ((p = strrchr(ttypath, '/')) != NULL) 80 ++p; 81 else 82 p = ttypath; 83 if ((t = getttynam(p))) { 84 ttype = t->ty_type; 85 goto map; 86 } 87 } 88 89 /* If still undefined, use "unknown". */ 90 ttype = "unknown"; 91 92 map: ttype = mapped(ttype); 93 94 found: 95 96 /* 97 * ttype now contains a pointer to the type of the terminal. 98 * If the first character is '?', ask the user. 99 */ 100 if (ttype[0] == '?') { 101 if (ttype[1] != '\0') 102 ttype = askuser(ttype + 1); 103 else 104 ttype = askuser(NULL); 105 } 106 107 while (setupterm(ttype, 0, &rval) == ERR) { 108 switch (rval) { 109 case 1: 110 warnx("terminal type %s is hardcopy", ttype); 111 break; 112 case 0: 113 warnx("terminal type %s is unknown", ttype); 114 break; 115 default: 116 if (!errno) 117 errno = ENOENT; 118 err(1, NULL); 119 } 120 ttype = askuser(NULL); 121 } 122 123 return (ttype); 124 } 125 126 /* Prompt the user for a terminal type. */ 127 const char * 128 askuser(dflt) 129 const char *dflt; 130 { 131 static char answer[256]; 132 char *p; 133 134 /* We can get recalled; if so, don't continue uselessly. */ 135 if (feof(stdin) || ferror(stdin)) { 136 (void)fprintf(stderr, "\n"); 137 exit(1); 138 } 139 for (;;) { 140 if (dflt) 141 (void)fprintf(stderr, "Terminal type? [%s] ", dflt); 142 else 143 (void)fprintf(stderr, "Terminal type? "); 144 (void)fflush(stderr); 145 146 if (fgets(answer, sizeof(answer), stdin) == NULL) { 147 if (dflt == NULL) { 148 (void)fprintf(stderr, "\n"); 149 exit(1); 150 } 151 return (dflt); 152 } 153 154 if ((p = strchr(answer, '\n')) != NULL) 155 *p = '\0'; 156 if (answer[0]) 157 return (answer); 158 if (dflt != NULL) 159 return (dflt); 160 } 161 } 162