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 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35#if 0
36static char sccsid[] = "@(#)tty_subs.c	8.2 (Berkeley) 4/18/94";
37#endif
38#endif /* not lint */
39#include <sys/cdefs.h>
40__FBSDID("$FreeBSD$");
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 */
58static FILE *ttyoutf = NULL;		/* output pointing at control tty */
59static 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
67int
68tty_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			(void)fclose(ttyoutf);
77		}
78		(void)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
94void
95tty_prnt(const char *fmt, ...)
96{
97	va_list ap;
98	if (ttyoutf == NULL)
99		return;
100	va_start(ap, fmt);
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
114int
115tty_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
137void
138paxwarn(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		(void)fflush(listf);
150		(void)fputc('\n', stderr);
151		vfpart = 0;
152	}
153	(void)fprintf(stderr, "%s: ", argv0);
154	(void)vfprintf(stderr, fmt, ap);
155	va_end(ap);
156	(void)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
165void
166syswarn(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		(void)fflush(listf);
178		(void)fputc('\n', stderr);
179		vfpart = 0;
180	}
181	(void)fprintf(stderr, "%s: ", argv0);
182	(void)vfprintf(stderr, fmt, ap);
183	va_end(ap);
184
185	/*
186	 * format and print the errno
187	 */
188	if (errnum > 0)
189		(void)fprintf(stderr, " <%s>", strerror(errnum));
190	(void)fputc('\n', stderr);
191}
192