| 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 | * @(#)tty_subs.c 8.2 (Berkeley) 4/18/94 |
| 38 | * $FreeBSD: src/bin/pax/tty_subs.c,v 1.11.2.1 2001/08/01 05:03:12 obrien Exp $ |
| 39 | * $DragonFly: src/bin/pax/tty_subs.c,v 1.6 2004/11/07 20:54:51 eirikn Exp $ |
| 40 | */ |
| 41 | |
| 42 | #include <sys/types.h> |
| 43 | #include <sys/stat.h> |
| 44 | #include <fcntl.h> |
| 45 | #include <stdio.h> |
| 46 | #include <unistd.h> |
| 47 | #include <stdlib.h> |
| 48 | #include <string.h> |
| 49 | #include "pax.h" |
| 50 | #include "extern.h" |
| 51 | #include <stdarg.h> |
| 52 | |
| 53 | /* |
| 54 | * routines that deal with I/O to and from the user |
| 55 | */ |
| 56 | |
| 57 | #define DEVTTY "/dev/tty" /* device for interactive i/o */ |
| 58 | static FILE *ttyoutf = NULL; /* output pointing at control tty */ |
| 59 | static FILE *ttyinf = NULL; /* input pointing at control tty */ |
| 60 | |
| 61 | /* |
| 62 | * tty_init() |
| 63 | * try to open the controlling terminal (if any) for this process. if the |
| 64 | * open fails, future ops that require user input will get an EOF |
| 65 | */ |
| 66 | |
| 67 | int |
| 68 | tty_init(void) |
| 69 | { |
| 70 | int ttyfd; |
| 71 | |
| 72 | if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) { |
| 73 | if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) { |
| 74 | if ((ttyinf = fdopen(ttyfd, "r")) != NULL) |
| 75 | return(0); |
| 76 | fclose(ttyoutf); |
| 77 | } |
| 78 | close(ttyfd); |
| 79 | } |
| 80 | |
| 81 | if (iflag) { |
| 82 | paxwarn(1, "Fatal error, cannot open %s", DEVTTY); |
| 83 | return(-1); |
| 84 | } |
| 85 | return(0); |
| 86 | } |
| 87 | |
| 88 | /* |
| 89 | * tty_prnt() |
| 90 | * print a message using the specified format to the controlling tty |
| 91 | * if there is no controlling terminal, just return. |
| 92 | */ |
| 93 | |
| 94 | void |
| 95 | tty_prnt(const char *fmt, ...) |
| 96 | { |
| 97 | va_list ap; |
| 98 | va_start(ap, fmt); |
| 99 | if (ttyoutf == NULL) |
| 100 | return; |
| 101 | vfprintf(ttyoutf, fmt, ap); |
| 102 | va_end(ap); |
| 103 | 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 | char *pt; |
| 118 | |
| 119 | if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL)) |
| 120 | return(-1); |
| 121 | *(str + len) = '\0'; |
| 122 | |
| 123 | /* |
| 124 | * strip off that trailing newline |
| 125 | */ |
| 126 | if ((pt = strchr(str, '\n')) != NULL) |
| 127 | *pt = '\0'; |
| 128 | return(0); |
| 129 | } |
| 130 | |
| 131 | /* |
| 132 | * paxwarn() |
| 133 | * write a warning message to stderr. if "set" the exit value of pax |
| 134 | * will be non-zero. |
| 135 | */ |
| 136 | |
| 137 | void |
| 138 | paxwarn(int set, const char *fmt, ...) |
| 139 | { |
| 140 | va_list ap; |
| 141 | va_start(ap, fmt); |
| 142 | if (set) |
| 143 | exit_val = 1; |
| 144 | /* |
| 145 | * when vflag we better ship out an extra \n to get this message on a |
| 146 | * line by itself |
| 147 | */ |
| 148 | if (vflag && vfpart) { |
| 149 | fflush(listf); |
| 150 | fputc('\n', stderr); |
| 151 | vfpart = 0; |
| 152 | } |
| 153 | fprintf(stderr, "%s: ", argv0); |
| 154 | vfprintf(stderr, fmt, ap); |
| 155 | va_end(ap); |
| 156 | fputc('\n', stderr); |
| 157 | } |
| 158 | |
| 159 | /* |
| 160 | * syswarn() |
| 161 | * write a warning message to stderr. if "set" the exit value of pax |
| 162 | * will be non-zero. |
| 163 | */ |
| 164 | |
| 165 | void |
| 166 | syswarn(int set, int errnum, const char *fmt, ...) |
| 167 | { |
| 168 | va_list ap; |
| 169 | va_start(ap, fmt); |
| 170 | if (set) |
| 171 | exit_val = 1; |
| 172 | /* |
| 173 | * when vflag we better ship out an extra \n to get this message on a |
| 174 | * line by itself |
| 175 | */ |
| 176 | if (vflag && vfpart) { |
| 177 | fflush(listf); |
| 178 | fputc('\n', stderr); |
| 179 | vfpart = 0; |
| 180 | } |
| 181 | fprintf(stderr, "%s: ", argv0); |
| 182 | vfprintf(stderr, fmt, ap); |
| 183 | va_end(ap); |
| 184 | |
| 185 | /* |
| 186 | * format and print the errno |
| 187 | */ |
| 188 | if (errnum > 0) |
| 189 | fprintf(stderr, " <%s>", strerror(errnum)); |
| 190 | fputc('\n', stderr); |
| 191 | } |