1 /*- 2 * Copyright (c) 1992 Keith Muller. 3 * Copyright (c) 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Keith Muller of the University of California, San Diego. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. 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 * @(#)tty_subs.c 8.2 (Berkeley) 4/18/94 34 * $FreeBSD: src/bin/pax/tty_subs.c,v 1.11.2.1 2001/08/01 05:03:12 obrien Exp $ 35 * $DragonFly: src/bin/pax/tty_subs.c,v 1.6 2004/11/07 20:54:51 eirikn Exp $ 36 */ 37 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 #include <fcntl.h> 41 #include <stdio.h> 42 #include <unistd.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include "pax.h" 46 #include "extern.h" 47 #include <stdarg.h> 48 49 /* 50 * routines that deal with I/O to and from the user 51 */ 52 53 #define DEVTTY "/dev/tty" /* device for interactive i/o */ 54 static FILE *ttyoutf = NULL; /* output pointing at control tty */ 55 static FILE *ttyinf = NULL; /* input pointing at control tty */ 56 57 /* 58 * tty_init() 59 * try to open the controlling terminal (if any) for this process. if the 60 * open fails, future ops that require user input will get an EOF 61 */ 62 63 int 64 tty_init(void) 65 { 66 int ttyfd; 67 68 if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) { 69 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) { 70 if ((ttyinf = fdopen(ttyfd, "r")) != NULL) 71 return(0); 72 fclose(ttyoutf); 73 } 74 close(ttyfd); 75 } 76 77 if (iflag) { 78 paxwarn(1, "Fatal error, cannot open %s", DEVTTY); 79 return(-1); 80 } 81 return(0); 82 } 83 84 /* 85 * tty_prnt() 86 * print a message using the specified format to the controlling tty 87 * if there is no controlling terminal, just return. 88 */ 89 90 void 91 tty_prnt(const char *fmt, ...) 92 { 93 va_list ap; 94 va_start(ap, fmt); 95 if (ttyoutf == NULL) 96 return; 97 vfprintf(ttyoutf, fmt, ap); 98 va_end(ap); 99 fflush(ttyoutf); 100 } 101 102 /* 103 * tty_read() 104 * read a string from the controlling terminal if it is open into the 105 * supplied buffer 106 * Return: 107 * 0 if data was read, -1 otherwise. 108 */ 109 110 int 111 tty_read(char *str, int len) 112 { 113 char *pt; 114 115 if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL)) 116 return(-1); 117 *(str + len) = '\0'; 118 119 /* 120 * strip off that trailing newline 121 */ 122 if ((pt = strchr(str, '\n')) != NULL) 123 *pt = '\0'; 124 return(0); 125 } 126 127 /* 128 * paxwarn() 129 * write a warning message to stderr. if "set" the exit value of pax 130 * will be non-zero. 131 */ 132 133 void 134 paxwarn(int set, const char *fmt, ...) 135 { 136 va_list ap; 137 va_start(ap, fmt); 138 if (set) 139 exit_val = 1; 140 /* 141 * when vflag we better ship out an extra \n to get this message on a 142 * line by itself 143 */ 144 if (vflag && vfpart) { 145 fflush(listf); 146 fputc('\n', stderr); 147 vfpart = 0; 148 } 149 fprintf(stderr, "%s: ", argv0); 150 vfprintf(stderr, fmt, ap); 151 va_end(ap); 152 fputc('\n', stderr); 153 } 154 155 /* 156 * syswarn() 157 * write a warning message to stderr. if "set" the exit value of pax 158 * will be non-zero. 159 */ 160 161 void 162 syswarn(int set, int errnum, const char *fmt, ...) 163 { 164 va_list ap; 165 va_start(ap, fmt); 166 if (set) 167 exit_val = 1; 168 /* 169 * when vflag we better ship out an extra \n to get this message on a 170 * line by itself 171 */ 172 if (vflag && vfpart) { 173 fflush(listf); 174 fputc('\n', stderr); 175 vfpart = 0; 176 } 177 fprintf(stderr, "%s: ", argv0); 178 vfprintf(stderr, fmt, ap); 179 va_end(ap); 180 181 /* 182 * format and print the errno 183 */ 184 if (errnum > 0) 185 fprintf(stderr, " <%s>", strerror(errnum)); 186 fputc('\n', stderr); 187 } 188