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