tty_subs.c revision 76017
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. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38#ifndef lint 39#if 0 40static char sccsid[] = "@(#)tty_subs.c 8.2 (Berkeley) 4/18/94"; 41#endif 42static const char rcsid[] = 43 "$FreeBSD: head/bin/pax/tty_subs.c 76017 2001-04-26 08:37:00Z kris $"; 44#endif /* not lint */ 45 46#include <sys/types.h> 47#include <sys/stat.h> 48#include <fcntl.h> 49#include <stdio.h> 50#include <unistd.h> 51#include <stdlib.h> 52#include <string.h> 53#include "pax.h" 54#include "extern.h" 55#ifdef __STDC__ 56#include <stdarg.h> 57#else 58#include <varargs.h> 59#endif 60 61/* 62 * routines that deal with I/O to and from the user 63 */ 64 65#define DEVTTY "/dev/tty" /* device for interactive i/o */ 66static FILE *ttyoutf = NULL; /* output pointing at control tty */ 67static FILE *ttyinf = NULL; /* input pointing at control tty */ 68 69/* 70 * tty_init() 71 * try to open the controlling terminal (if any) for this process. if the 72 * open fails, future ops that require user input will get an EOF 73 */ 74 75#ifdef __STDC__ 76int 77tty_init(void) 78#else 79int 80tty_init() 81#endif 82{ 83 int ttyfd; 84 85 if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) { 86 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) { 87 if ((ttyinf = fdopen(ttyfd, "r")) != NULL) 88 return(0); 89 (void)fclose(ttyoutf); 90 } 91 (void)close(ttyfd); 92 } 93 94 if (iflag) { 95 paxwarn(1, "Fatal error, cannot open %s", DEVTTY); 96 return(-1); 97 } 98 return(0); 99} 100 101/* 102 * tty_prnt() 103 * print a message using the specified format to the controlling tty 104 * if there is no controlling terminal, just return. 105 */ 106 107#ifdef __STDC__ 108void 109tty_prnt(const char *fmt, ...) 110#else 111void 112tty_prnt(fmt, va_alist) 113 const char *fmt; 114 va_dcl 115#endif 116{ 117 va_list ap; 118# ifdef __STDC__ 119 va_start(ap, fmt); 120# else 121 va_start(ap); 122# endif 123 if (ttyoutf == NULL) 124 return; 125 (void)vfprintf(ttyoutf, fmt, ap); 126 va_end(ap); 127 (void)fflush(ttyoutf); 128} 129 130/* 131 * tty_read() 132 * read a string from the controlling terminal if it is open into the 133 * supplied buffer 134 * Return: 135 * 0 if data was read, -1 otherwise. 136 */ 137 138#ifdef __STDC__ 139int 140tty_read(char *str, int len) 141#else 142int 143tty_read(str, len) 144 char *str; 145 int len; 146#endif 147{ 148 register char *pt; 149 150 if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL)) 151 return(-1); 152 *(str + len) = '\0'; 153 154 /* 155 * strip off that trailing newline 156 */ 157 if ((pt = strchr(str, '\n')) != NULL) 158 *pt = '\0'; 159 return(0); 160} 161 162/* 163 * paxwarn() 164 * write a warning message to stderr. if "set" the exit value of pax 165 * will be non-zero. 166 */ 167 168#ifdef __STDC__ 169void 170paxwarn(int set, const char *fmt, ...) 171#else 172void 173paxwarn(set, fmt, va_alist) 174 int set; 175 const char *fmt; 176 va_dcl 177#endif 178{ 179 va_list ap; 180# ifdef __STDC__ 181 va_start(ap, fmt); 182# else 183 va_start(ap); 184# endif 185 if (set) 186 exit_val = 1; 187 /* 188 * when vflag we better ship out an extra \n to get this message on a 189 * line by itself 190 */ 191 if (vflag && vfpart) { 192 (void)fputc('\n', stderr); 193 vfpart = 0; 194 } 195 (void)fprintf(stderr, "%s: ", argv0); 196 (void)vfprintf(stderr, fmt, ap); 197 va_end(ap); 198 (void)fputc('\n', stderr); 199} 200 201/* 202 * syswarn() 203 * write a warning message to stderr. if "set" the exit value of pax 204 * will be non-zero. 205 */ 206 207#ifdef __STDC__ 208void 209syswarn(int set, int errnum, const char *fmt, ...) 210#else 211void 212syswarn(set, errnum, fmt, va_alist) 213 int set; 214 int errnum; 215 const char *fmt; 216 va_dcl 217#endif 218{ 219 va_list ap; 220# ifdef __STDC__ 221 va_start(ap, fmt); 222# else 223 va_start(ap); 224# endif 225 if (set) 226 exit_val = 1; 227 /* 228 * when vflag we better ship out an extra \n to get this message on a 229 * line by itself 230 */ 231 if (vflag && vfpart) { 232 (void)fputc('\n', stderr); 233 vfpart = 0; 234 } 235 (void)fprintf(stderr, "%s: ", argv0); 236 (void)vfprintf(stderr, fmt, ap); 237 va_end(ap); 238 239 /* 240 * format and print the errno 241 */ 242 if (errnum > 0) 243 (void)fprintf(stderr, " <%s>", strerror(errnum)); 244 (void)fputc('\n', stderr); 245} 246