1/*	$OpenBSD: tty_subs.c,v 1.18 2023/06/26 16:58:50 millert Exp $	*/
2/*	$NetBSD: tty_subs.c,v 1.5 1995/03/21 09:07:52 cgd Exp $	*/
3
4/*-
5 * Copyright (c) 1992 Keith Muller.
6 * Copyright (c) 1992, 1993
7 *	The Regents of the University of California.  All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * Keith Muller of the University of California, San Diego.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/types.h>
38#include <sys/stat.h>
39#include <fcntl.h>
40#include <stdarg.h>
41#include <stdio.h>
42#include <string.h>
43#include <unistd.h>
44
45#include "pax.h"
46#include "extern.h"
47
48/*
49 * routines that deal with I/O to and from the user
50 */
51
52#define DEVTTY		"/dev/tty"	/* device for interactive i/o */
53static FILE *ttyoutf = NULL;		/* output pointing at control tty */
54static FILE *ttyinf = NULL;		/* input pointing at control tty */
55
56/*
57 * tty_init()
58 *	try to open the controlling terminal (if any) for this process. if the
59 *	open fails, future ops that require user input will get an EOF
60 */
61
62int
63tty_init(void)
64{
65	int ttyfd;
66
67	if ((ttyfd = open(DEVTTY, O_RDWR | O_CLOEXEC)) >= 0) {
68		if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
69			if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
70				return(0);
71			(void)fclose(ttyoutf);
72		}
73		(void)close(ttyfd);
74	}
75
76	if (iflag) {
77		paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
78		return(-1);
79	}
80	return(0);
81}
82
83/*
84 * tty_prnt()
85 *	print a message using the specified format to the controlling tty
86 *	if there is no controlling terminal, just return.
87 */
88
89void
90tty_prnt(const char *fmt, ...)
91{
92	va_list ap;
93	char buf[8192];
94
95	if (ttyoutf == NULL)
96		return;
97	va_start(ap, fmt);
98	(void)vsnprintf(buf, sizeof(buf), fmt, ap);
99	va_end(ap);
100	safe_print(buf, ttyoutf);
101	(void)fflush(ttyoutf);
102}
103
104/*
105 * tty_read()
106 *	read a string from the controlling terminal if it is open into the
107 *	supplied buffer
108 * Return:
109 *	0 if data was read, -1 otherwise.
110 */
111
112int
113tty_read(char *str, int len)
114{
115	if (ttyinf == NULL || fgets(str, len, ttyinf) == NULL)
116		return(-1);
117
118	/*
119	 * strip off that trailing newline
120	 */
121	str[strcspn(str, "\n")] = '\0';
122	return(0);
123}
124
125/*
126 * paxwarn()
127 *	write a warning message to stderr. if "set" the exit value of pax
128 *	will be non-zero.
129 */
130
131void
132paxwarn(int set, const char *fmt, ...)
133{
134	va_list ap;
135	char buf[8192];
136
137	if (set)
138		exit_val = 1;
139	/*
140	 * when vflag we better ship out an extra \n to get this message on a
141	 * line by itself
142	 */
143	if (vflag && vfpart) {
144		(void)fflush(listf);
145		(void)fputc('\n', stderr);
146		vfpart = 0;
147	}
148	(void)fprintf(stderr, "%s: ", argv0);
149	va_start(ap, fmt);
150	(void)vsnprintf(buf, sizeof(buf), fmt, ap);
151	va_end(ap);
152	safe_print(buf, stderr);
153	(void)fputc('\n', stderr);
154}
155
156/*
157 * syswarn()
158 *	write a warning message to stderr. if "set" the exit value of pax
159 *	will be non-zero.
160 */
161
162void
163syswarn(int set, int errnum, const char *fmt, ...)
164{
165	va_list ap;
166	char buf[8192];
167
168	if (set)
169		exit_val = 1;
170	/*
171	 * when vflag we better ship out an extra \n to get this message on a
172	 * line by itself
173	 */
174	if (vflag && vfpart) {
175		(void)fflush(listf);
176		(void)fputc('\n', stderr);
177		vfpart = 0;
178	}
179	(void)fprintf(stderr, "%s: ", argv0);
180	va_start(ap, fmt);
181	(void)vsnprintf(buf, sizeof(buf), fmt, ap);
182	va_end(ap);
183	safe_print(buf, stderr);
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