1 /* $NetBSD: tty_subs.c,v 1.14 2003/08/07 09:05:23 agc Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Keith Muller of the University of California, San Diego. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 /*- 36 * Copyright (c) 1992 Keith Muller. 37 * 38 * This code is derived from software contributed to Berkeley by 39 * Keith Muller of the University of California, San Diego. 40 * 41 * Redistribution and use in source and binary forms, with or without 42 * modification, are permitted provided that the following conditions 43 * are met: 44 * 1. Redistributions of source code must retain the above copyright 45 * notice, this list of conditions and the following disclaimer. 46 * 2. Redistributions in binary form must reproduce the above copyright 47 * notice, this list of conditions and the following disclaimer in the 48 * documentation and/or other materials provided with the distribution. 49 * 3. All advertising materials mentioning features or use of this software 50 * must display the following acknowledgement: 51 * This product includes software developed by the University of 52 * California, Berkeley and its contributors. 53 * 4. Neither the name of the University nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 */ 69 70 #include <sys/cdefs.h> 71 #if defined(__RCSID) && !defined(lint) 72 #if 0 73 static char sccsid[] = "@(#)tty_subs.c 8.2 (Berkeley) 4/18/94"; 74 #else 75 __RCSID("$NetBSD: tty_subs.c,v 1.14 2003/08/07 09:05:23 agc Exp $"); 76 #endif 77 #endif /* not lint */ 78 79 #include <sys/types.h> 80 #include <sys/time.h> 81 #include <sys/stat.h> 82 #include <sys/param.h> 83 #include <fcntl.h> 84 #include <stdio.h> 85 #include <ctype.h> 86 #include <errno.h> 87 #include <unistd.h> 88 #include <stdlib.h> 89 #include <string.h> 90 #include "pax.h" 91 #include "extern.h" 92 #include <stdarg.h> 93 94 /* 95 * routines that deal with I/O to and from the user 96 */ 97 98 #define DEVTTY "/dev/tty" /* device for interactive i/o */ 99 static FILE *ttyoutf = NULL; /* output pointing at control tty */ 100 static FILE *ttyinf = NULL; /* input pointing at control tty */ 101 102 /* 103 * tty_init() 104 * try to open the controlling termina (if any) for this process. if the 105 * open fails, future ops that require user input will get an EOF 106 */ 107 108 int 109 tty_init(void) 110 { 111 int ttyfd; 112 113 if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) { 114 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) { 115 if ((ttyinf = fdopen(ttyfd, "r")) != NULL) 116 return(0); 117 (void)fclose(ttyoutf); 118 } 119 (void)close(ttyfd); 120 } 121 122 if (iflag) { 123 tty_warn(1, "Fatal error, cannot open %s", DEVTTY); 124 return(-1); 125 } 126 return(0); 127 } 128 129 /* 130 * tty_prnt() 131 * print a message using the specified format to the controlling tty 132 * if there is no controlling terminal, just return. 133 */ 134 135 void 136 tty_prnt(const char *fmt, ...) 137 { 138 va_list ap; 139 if (ttyoutf == NULL) 140 return; 141 va_start(ap, fmt); 142 (void)vfprintf(ttyoutf, fmt, ap); 143 va_end(ap); 144 (void)fflush(ttyoutf); 145 } 146 147 /* 148 * tty_read() 149 * read a string from the controlling terminal if it is open into the 150 * supplied buffer 151 * Return: 152 * 0 if data was read, -1 otherwise. 153 */ 154 155 int 156 tty_read(char *str, int len) 157 { 158 char *pt; 159 160 if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL)) 161 return(-1); 162 *(str + len) = '\0'; 163 164 /* 165 * strip off that trailing newline 166 */ 167 if ((pt = strchr(str, '\n')) != NULL) 168 *pt = '\0'; 169 return(0); 170 } 171 172 /* 173 * tty_warn() 174 * write a warning message to stderr. if "set" the exit value of pax 175 * will be non-zero. 176 */ 177 178 void 179 tty_warn(int set, const char *fmt, ...) 180 { 181 va_list ap; 182 va_start(ap, fmt); 183 if (set) 184 exit_val = 1; 185 /* 186 * when vflag we better ship out an extra \n to get this message on a 187 * line by itself 188 */ 189 if (vflag && vfpart) { 190 (void)fputc('\n', stderr); 191 vfpart = 0; 192 } 193 (void)fprintf(stderr, "%s: ", argv0); 194 (void)vfprintf(stderr, fmt, ap); 195 va_end(ap); 196 (void)fputc('\n', stderr); 197 } 198 199 /* 200 * syswarn() 201 * write a warning message to stderr. if "set" the exit value of pax 202 * will be non-zero. 203 */ 204 205 void 206 syswarn(int set, int errnum, const char *fmt, ...) 207 { 208 va_list ap; 209 va_start(ap, fmt); 210 if (set) 211 exit_val = 1; 212 /* 213 * when vflag we better ship out an extra \n to get this message on a 214 * line by itself 215 */ 216 if (vflag && vfpart) { 217 (void)fputc('\n', stdout); 218 vfpart = 0; 219 } 220 (void)fprintf(stderr, "%s: ", argv0); 221 (void)vfprintf(stderr, fmt, ap); 222 va_end(ap); 223 224 /* 225 * format and print the errno 226 */ 227 if (errnum > 0) 228 (void)fprintf(stderr, " (%s)", strerror(errnum)); 229 (void)fputc('\n', stderr); 230 } 231