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 * $Id: tty_subs.c,v 1.6 1997/02/22 14:04:47 peter Exp $ 38 */ 39 40 #ifndef lint 41 static char const sccsid[] = "@(#)tty_subs.c 8.2 (Berkeley) 4/18/94"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/time.h> 46 #include <sys/stat.h> 47 #include <sys/param.h> 48 #include <fcntl.h> 49 #include <stdio.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 */ 67 static FILE *ttyoutf = NULL; /* output pointing at control tty */ 68 static 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__ 77 int 78 tty_init(void) 79 #else 80 int 81 tty_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 pax_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__ 109 void 110 tty_prnt(char *fmt, ...) 111 #else 112 void 113 tty_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__ 140 int 141 tty_read(char *str, int len) 142 #else 143 int 144 tty_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 * pax_warn() 165 * write a pax_warning message to stderr. if "set" the exit value of pax 166 * will be non-zero. 167 */ 168 169 #if __STDC__ 170 void 171 pax_warn(int set, char *fmt, ...) 172 #else 173 void 174 pax_warn(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 * sys_warn() 204 * write a pax_warning message to stderr. if "set" the exit value of pax 205 * will be non-zero. 206 */ 207 208 #if __STDC__ 209 void 210 sys_warn(int set, int errnum, char *fmt, ...) 211 #else 212 void 213 sys_warn(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