1 /* $NetBSD: tty_subs.c,v 1.11 2002/01/31 19:27:54 tv Exp $ */ 2 3 /*- 4 * Copyright (c) 1992 Keith Muller. 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Keith Muller of the University of California, San Diego. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 #if defined(__RCSID) && !defined(lint) 42 #if 0 43 static char sccsid[] = "@(#)tty_subs.c 8.2 (Berkeley) 4/18/94"; 44 #else 45 __RCSID("$NetBSD: tty_subs.c,v 1.11 2002/01/31 19:27:54 tv Exp $"); 46 #endif 47 #endif /* not lint */ 48 49 #include <sys/types.h> 50 #include <sys/time.h> 51 #include <sys/stat.h> 52 #include <sys/param.h> 53 #include <fcntl.h> 54 #include <stdio.h> 55 #include <ctype.h> 56 #include <errno.h> 57 #include <unistd.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include "pax.h" 61 #include "extern.h" 62 #include <stdarg.h> 63 64 /* 65 * routines that deal with I/O to and from the user 66 */ 67 68 #define DEVTTY "/dev/tty" /* device for interactive i/o */ 69 static FILE *ttyoutf = NULL; /* output pointing at control tty */ 70 static FILE *ttyinf = NULL; /* input pointing at control tty */ 71 72 /* 73 * tty_init() 74 * try to open the controlling termina (if any) for this process. if the 75 * open fails, future ops that require user input will get an EOF 76 */ 77 78 int 79 tty_init(void) 80 { 81 int ttyfd; 82 83 if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) { 84 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) { 85 if ((ttyinf = fdopen(ttyfd, "r")) != NULL) 86 return(0); 87 (void)fclose(ttyoutf); 88 } 89 (void)close(ttyfd); 90 } 91 92 if (iflag) { 93 tty_warn(1, "Fatal error, cannot open %s", DEVTTY); 94 return(-1); 95 } 96 return(0); 97 } 98 99 /* 100 * tty_prnt() 101 * print a message using the specified format to the controlling tty 102 * if there is no controlling terminal, just return. 103 */ 104 105 void 106 tty_prnt(const char *fmt, ...) 107 { 108 va_list ap; 109 if (ttyoutf == NULL) 110 return; 111 va_start(ap, fmt); 112 (void)vfprintf(ttyoutf, fmt, ap); 113 va_end(ap); 114 (void)fflush(ttyoutf); 115 } 116 117 /* 118 * tty_read() 119 * read a string from the controlling terminal if it is open into the 120 * supplied buffer 121 * Return: 122 * 0 if data was read, -1 otherwise. 123 */ 124 125 int 126 tty_read(char *str, int len) 127 { 128 char *pt; 129 130 if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL)) 131 return(-1); 132 *(str + len) = '\0'; 133 134 /* 135 * strip off that trailing newline 136 */ 137 if ((pt = strchr(str, '\n')) != NULL) 138 *pt = '\0'; 139 return(0); 140 } 141 142 /* 143 * tty_warn() 144 * write a warning message to stderr. if "set" the exit value of pax 145 * will be non-zero. 146 */ 147 148 void 149 tty_warn(int set, const char *fmt, ...) 150 { 151 va_list ap; 152 va_start(ap, fmt); 153 if (set) 154 exit_val = 1; 155 /* 156 * when vflag we better ship out an extra \n to get this message on a 157 * line by itself 158 */ 159 if (vflag && vfpart) { 160 (void)fputc('\n', stderr); 161 vfpart = 0; 162 } 163 (void)fprintf(stderr, "%s: ", argv0); 164 (void)vfprintf(stderr, fmt, ap); 165 va_end(ap); 166 (void)fputc('\n', stderr); 167 } 168 169 /* 170 * syswarn() 171 * write a warning message to stderr. if "set" the exit value of pax 172 * will be non-zero. 173 */ 174 175 void 176 syswarn(int set, int errnum, const char *fmt, ...) 177 { 178 va_list ap; 179 va_start(ap, fmt); 180 if (set) 181 exit_val = 1; 182 /* 183 * when vflag we better ship out an extra \n to get this message on a 184 * line by itself 185 */ 186 if (vflag && vfpart) { 187 (void)fputc('\n', stderr); 188 vfpart = 0; 189 } 190 (void)fprintf(stderr, "%s: ", argv0); 191 (void)vfprintf(stderr, fmt, ap); 192 va_end(ap); 193 194 /* 195 * format and print the errno 196 */ 197 if (errnum > 0) 198 (void)fprintf(stderr, " <%s>", strerror(errnum)); 199 (void)fputc('\n', stderr); 200 } 201