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 #include <sys/types.h> 37 #include <sys/stat.h> 38 #include <fcntl.h> 39 #include <stdio.h> 40 #include <unistd.h> 41 #include <string.h> 42 #include "pax.h" 43 #include "extern.h" 44 #include <stdarg.h> 45 46 /* 47 * routines that deal with I/O to and from the user 48 */ 49 50 #define DEVTTY "/dev/tty" /* device for interactive i/o */ 51 static FILE *ttyoutf = NULL; /* output pointing at control tty */ 52 static FILE *ttyinf = NULL; /* input pointing at control tty */ 53 54 /* 55 * tty_init() 56 * try to open the controlling terminal (if any) for this process. if the 57 * open fails, future ops that require user input will get an EOF 58 */ 59 60 int 61 tty_init(void) 62 { 63 int ttyfd; 64 65 if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) { 66 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) { 67 if ((ttyinf = fdopen(ttyfd, "r")) != NULL) 68 return(0); 69 (void)fclose(ttyoutf); 70 } 71 (void)close(ttyfd); 72 } 73 74 if (iflag) { 75 paxwarn(1, "Fatal error, cannot open %s", DEVTTY); 76 return(-1); 77 } 78 return(0); 79 } 80 81 /* 82 * tty_prnt() 83 * print a message using the specified format to the controlling tty 84 * if there is no controlling terminal, just return. 85 */ 86 87 void 88 tty_prnt(const char *fmt, ...) 89 { 90 va_list ap; 91 if (ttyoutf == NULL) 92 return; 93 va_start(ap, fmt); 94 (void)vfprintf(ttyoutf, fmt, ap); 95 va_end(ap); 96 (void)fflush(ttyoutf); 97 } 98 99 /* 100 * tty_read() 101 * read a string from the controlling terminal if it is open into the 102 * supplied buffer 103 * Return: 104 * 0 if data was read, -1 otherwise. 105 */ 106 107 int 108 tty_read(char *str, int len) 109 { 110 char *pt; 111 112 if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL)) 113 return(-1); 114 *(str + len) = '\0'; 115 116 /* 117 * strip off that trailing newline 118 */ 119 if ((pt = strchr(str, '\n')) != NULL) 120 *pt = '\0'; 121 return(0); 122 } 123 124 /* 125 * paxwarn() 126 * write a warning message to stderr. if "set" the exit value of pax 127 * will be non-zero. 128 */ 129 130 void 131 paxwarn(int set, const char *fmt, ...) 132 { 133 va_list ap; 134 va_start(ap, fmt); 135 if (set) 136 exit_val = 1; 137 /* 138 * when vflag we better ship out an extra \n to get this message on a 139 * line by itself 140 */ 141 if (vflag && vfpart) { 142 (void)fflush(listf); 143 (void)fputc('\n', stderr); 144 vfpart = 0; 145 } 146 (void)fprintf(stderr, "%s: ", argv0); 147 (void)vfprintf(stderr, fmt, ap); 148 va_end(ap); 149 (void)fputc('\n', stderr); 150 } 151 152 /* 153 * syswarn() 154 * write a warning message to stderr. if "set" the exit value of pax 155 * will be non-zero. 156 */ 157 158 void 159 syswarn(int set, int errnum, const char *fmt, ...) 160 { 161 va_list ap; 162 va_start(ap, fmt); 163 if (set) 164 exit_val = 1; 165 /* 166 * when vflag we better ship out an extra \n to get this message on a 167 * line by itself 168 */ 169 if (vflag && vfpart) { 170 (void)fflush(listf); 171 (void)fputc('\n', stderr); 172 vfpart = 0; 173 } 174 (void)fprintf(stderr, "%s: ", argv0); 175 (void)vfprintf(stderr, fmt, ap); 176 va_end(ap); 177 178 /* 179 * format and print the errno 180 */ 181 if (errnum > 0) 182 (void)fprintf(stderr, " <%s>", strerror(errnum)); 183 (void)fputc('\n', stderr); 184 } 185