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 #include <sys/types.h> 43 #include <sys/stat.h> 44 #include <fcntl.h> 45 #include <stdio.h> 46 #include <unistd.h> 47 #include <string.h> 48 #include "pax.h" 49 #include "extern.h" 50 #include <stdarg.h> 51 52 /* 53 * routines that deal with I/O to and from the user 54 */ 55 56 #define DEVTTY "/dev/tty" /* device for interactive i/o */ 57 static FILE *ttyoutf = NULL; /* output pointing at control tty */ 58 static FILE *ttyinf = NULL; /* input pointing at control tty */ 59 60 /* 61 * tty_init() 62 * try to open the controlling terminal (if any) for this process. if the 63 * open fails, future ops that require user input will get an EOF 64 */ 65 66 int 67 tty_init(void) 68 { 69 int ttyfd; 70 71 if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) { 72 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) { 73 if ((ttyinf = fdopen(ttyfd, "r")) != NULL) 74 return(0); 75 (void)fclose(ttyoutf); 76 } 77 (void)close(ttyfd); 78 } 79 80 if (iflag) { 81 paxwarn(1, "Fatal error, cannot open %s", DEVTTY); 82 return(-1); 83 } 84 return(0); 85 } 86 87 /* 88 * tty_prnt() 89 * print a message using the specified format to the controlling tty 90 * if there is no controlling terminal, just return. 91 */ 92 93 void 94 tty_prnt(const char *fmt, ...) 95 { 96 va_list ap; 97 if (ttyoutf == NULL) 98 return; 99 va_start(ap, fmt); 100 (void)vfprintf(ttyoutf, fmt, ap); 101 va_end(ap); 102 (void)fflush(ttyoutf); 103 } 104 105 /* 106 * tty_read() 107 * read a string from the controlling terminal if it is open into the 108 * supplied buffer 109 * Return: 110 * 0 if data was read, -1 otherwise. 111 */ 112 113 int 114 tty_read(char *str, int len) 115 { 116 char *pt; 117 118 if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL)) 119 return(-1); 120 *(str + len) = '\0'; 121 122 /* 123 * strip off that trailing newline 124 */ 125 if ((pt = strchr(str, '\n')) != NULL) 126 *pt = '\0'; 127 return(0); 128 } 129 130 /* 131 * paxwarn() 132 * write a warning message to stderr. if "set" the exit value of pax 133 * will be non-zero. 134 */ 135 136 void 137 paxwarn(int set, const char *fmt, ...) 138 { 139 va_list ap; 140 va_start(ap, fmt); 141 if (set) 142 exit_val = 1; 143 /* 144 * when vflag we better ship out an extra \n to get this message on a 145 * line by itself 146 */ 147 if (vflag && vfpart) { 148 (void)fflush(listf); 149 (void)fputc('\n', stderr); 150 vfpart = 0; 151 } 152 (void)fprintf(stderr, "%s: ", argv0); 153 (void)vfprintf(stderr, fmt, ap); 154 va_end(ap); 155 (void)fputc('\n', stderr); 156 } 157 158 /* 159 * syswarn() 160 * write a warning message to stderr. if "set" the exit value of pax 161 * will be non-zero. 162 */ 163 164 void 165 syswarn(int set, int errnum, const char *fmt, ...) 166 { 167 va_list ap; 168 va_start(ap, fmt); 169 if (set) 170 exit_val = 1; 171 /* 172 * when vflag we better ship out an extra \n to get this message on a 173 * line by itself 174 */ 175 if (vflag && vfpart) { 176 (void)fflush(listf); 177 (void)fputc('\n', stderr); 178 vfpart = 0; 179 } 180 (void)fprintf(stderr, "%s: ", argv0); 181 (void)vfprintf(stderr, fmt, ap); 182 va_end(ap); 183 184 /* 185 * format and print the errno 186 */ 187 if (errnum > 0) 188 (void)fprintf(stderr, " <%s>", strerror(errnum)); 189 (void)fputc('\n', stderr); 190 } 191