1 /* $OpenBSD: tty_subs.c,v 1.16 2014/11/23 05:28:12 guenther Exp $ */ 2 /* $NetBSD: tty_subs.c,v 1.5 1995/03/21 09:07:52 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1992 Keith Muller. 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Keith Muller of the University of California, San Diego. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #include <sys/types.h> 38 #include <sys/time.h> 39 #include <sys/stat.h> 40 #include <fcntl.h> 41 #include <stdio.h> 42 #include <errno.h> 43 #include <unistd.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include "pax.h" 47 #include "extern.h" 48 #include <stdarg.h> 49 50 /* 51 * routines that deal with I/O to and from the user 52 */ 53 54 #define DEVTTY "/dev/tty" /* device for interactive i/o */ 55 static FILE *ttyoutf = NULL; /* output pointing at control tty */ 56 static FILE *ttyinf = NULL; /* input pointing at control tty */ 57 58 /* 59 * tty_init() 60 * try to open the controlling terminal (if any) for this process. if the 61 * open fails, future ops that require user input will get an EOF 62 */ 63 64 int 65 tty_init(void) 66 { 67 int ttyfd; 68 69 if ((ttyfd = open(DEVTTY, O_RDWR | O_CLOEXEC)) >= 0) { 70 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) { 71 if ((ttyinf = fdopen(ttyfd, "r")) != NULL) 72 return(0); 73 (void)fclose(ttyoutf); 74 } 75 (void)close(ttyfd); 76 } 77 78 if (iflag) { 79 paxwarn(1, "Fatal error, cannot open %s", DEVTTY); 80 return(-1); 81 } 82 return(0); 83 } 84 85 /* 86 * tty_prnt() 87 * print a message using the specified format to the controlling tty 88 * if there is no controlling terminal, just return. 89 */ 90 91 void 92 tty_prnt(const char *fmt, ...) 93 { 94 va_list ap; 95 96 va_start(ap, fmt); 97 if (ttyoutf == NULL) { 98 va_end(ap); 99 return; 100 } 101 (void)vfprintf(ttyoutf, fmt, ap); 102 va_end(ap); 103 (void)fflush(ttyoutf); 104 } 105 106 /* 107 * tty_read() 108 * read a string from the controlling terminal if it is open into the 109 * supplied buffer 110 * Return: 111 * 0 if data was read, -1 otherwise. 112 */ 113 114 int 115 tty_read(char *str, int len) 116 { 117 if (ttyinf == NULL || fgets(str, len, ttyinf) == NULL) 118 return(-1); 119 120 /* 121 * strip off that trailing newline 122 */ 123 str[strcspn(str, "\n")] = '\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; 137 138 va_start(ap, fmt); 139 if (set) 140 exit_val = 1; 141 /* 142 * when vflag we better ship out an extra \n to get this message on a 143 * line by itself 144 */ 145 if (vflag && vfpart) { 146 (void)fflush(listf); 147 (void)fputc('\n', stderr); 148 vfpart = 0; 149 } 150 (void)fprintf(stderr, "%s: ", argv0); 151 (void)vfprintf(stderr, fmt, ap); 152 va_end(ap); 153 (void)fputc('\n', stderr); 154 } 155 156 /* 157 * syswarn() 158 * write a warning message to stderr. if "set" the exit value of pax 159 * will be non-zero. 160 */ 161 162 void 163 syswarn(int set, int errnum, const char *fmt, ...) 164 { 165 va_list ap; 166 167 va_start(ap, fmt); 168 if (set) 169 exit_val = 1; 170 /* 171 * when vflag we better ship out an extra \n to get this message on a 172 * line by itself 173 */ 174 if (vflag && vfpart) { 175 (void)fflush(listf); 176 (void)fputc('\n', stderr); 177 vfpart = 0; 178 } 179 (void)fprintf(stderr, "%s: ", argv0); 180 (void)vfprintf(stderr, fmt, ap); 181 va_end(ap); 182 183 /* 184 * format and print the errno 185 */ 186 if (errnum > 0) 187 (void)fprintf(stderr, ": %s", strerror(errnum)); 188 (void)fputc('\n', stderr); 189 } 190