tty_subs.c revision 1.2
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/*static char sccsid[] = "from: @(#)tty_subs.c 8.2 (Berkeley) 4/18/94";*/ 40static char rcsid[] = "$Id: tty_subs.c,v 1.2 1994/06/13 16:34:32 jtc Exp $"; 41#endif /* not lint */ 42 43#include <sys/types.h> 44#include <sys/time.h> 45#include <sys/stat.h> 46#include <sys/param.h> 47#include <fcntl.h> 48#include <stdio.h> 49#include <ctype.h> 50#include <errno.h> 51#include <unistd.h> 52#include <stdlib.h> 53#include <string.h> 54#include "pax.h" 55#include "extern.h" 56#if __STDC__ 57#include <stdarg.h> 58#else 59#include <varargs.h> 60#endif 61 62/* 63 * routines that deal with I/O to and from the user 64 */ 65 66#define DEVTTY "/dev/tty" /* device for interactive i/o */ 67static FILE *ttyoutf = NULL; /* output pointing at control tty */ 68static FILE *ttyinf = NULL; /* input pointing at control tty */ 69 70/* 71 * tty_init() 72 * try to open the controlling termina (if any) for this process. if the 73 * open fails, future ops that require user input will get an EOF 74 */ 75 76#if __STDC__ 77int 78tty_init(void) 79#else 80int 81tty_init() 82#endif 83{ 84 int ttyfd; 85 86 if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) { 87 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) { 88 if ((ttyinf = fdopen(ttyfd, "r")) != NULL) 89 return(0); 90 (void)fclose(ttyoutf); 91 } 92 (void)close(ttyfd); 93 } 94 95 if (iflag) { 96 warn(1, "Fatal error, cannot open %s", DEVTTY); 97 return(-1); 98 } 99 return(0); 100} 101 102/* 103 * tty_prnt() 104 * print a message using the specified format to the controlling tty 105 * if there is no controlling terminal, just return. 106 */ 107 108#if __STDC__ 109void 110tty_prnt(char *fmt, ...) 111#else 112void 113tty_prnt(fmt, va_alist) 114 char *fmt; 115 va_dcl 116#endif 117{ 118 va_list ap; 119# if __STDC__ 120 va_start(ap, fmt); 121# else 122 va_start(ap); 123# endif 124 if (ttyoutf == NULL) 125 return; 126 (void)vfprintf(ttyoutf, fmt, ap); 127 va_end(ap); 128 (void)fflush(ttyoutf); 129} 130 131/* 132 * tty_read() 133 * read a string from the controlling terminal if it is open into the 134 * supplied buffer 135 * Return: 136 * 0 if data was read, -1 otherwise. 137 */ 138 139#if __STDC__ 140int 141tty_read(char *str, int len) 142#else 143int 144tty_read(str, len) 145 char *str; 146 int len; 147#endif 148{ 149 register char *pt; 150 151 if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL)) 152 return(-1); 153 *(str + len) = '\0'; 154 155 /* 156 * strip off that trailing newline 157 */ 158 if ((pt = strchr(str, '\n')) != NULL) 159 *pt = '\0'; 160 return(0); 161} 162 163/* 164 * warn() 165 * write a warning message to stderr. if "set" the exit value of pax 166 * will be non-zero. 167 */ 168 169#if __STDC__ 170void 171warn(int set, char *fmt, ...) 172#else 173void 174warn(set, fmt, va_alist) 175 int set; 176 char *fmt; 177 va_dcl 178#endif 179{ 180 va_list ap; 181# if __STDC__ 182 va_start(ap, fmt); 183# else 184 va_start(ap); 185# endif 186 if (set) 187 exit_val = 1; 188 /* 189 * when vflag we better ship out an extra \n to get this message on a 190 * line by itself 191 */ 192 if (vflag && vfpart) { 193 (void)fputc('\n', stderr); 194 vfpart = 0; 195 } 196 (void)fprintf(stderr, "%s: ", argv0); 197 (void)vfprintf(stderr, fmt, ap); 198 va_end(ap); 199 (void)fputc('\n', stderr); 200} 201 202/* 203 * syswarn() 204 * write a warning message to stderr. if "set" the exit value of pax 205 * will be non-zero. 206 */ 207 208#if __STDC__ 209void 210syswarn(int set, int errnum, char *fmt, ...) 211#else 212void 213syswarn(set, errnum, fmt, va_alist) 214 int set; 215 int errnum; 216 char *fmt; 217 va_dcl 218#endif 219{ 220 va_list ap; 221# if __STDC__ 222 va_start(ap, fmt); 223# else 224 va_start(ap); 225# endif 226 if (set) 227 exit_val = 1; 228 /* 229 * when vflag we better ship out an extra \n to get this message on a 230 * line by itself 231 */ 232 if (vflag && vfpart) { 233 (void)fputc('\n', stderr); 234 vfpart = 0; 235 } 236 (void)fprintf(stderr, "%s: ", argv0); 237 (void)vfprintf(stderr, fmt, ap); 238 va_end(ap); 239 240 /* 241 * format and print the errno 242 */ 243 if (errnum > 0) 244 (void)fprintf(stderr, " <%s>", sys_errlist[errnum]); 245 (void)fputc('\n', stderr); 246} 247