1/*	$OpenBSD: tty_subs.c,v 1.12 2003/06/02 23:32:09 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#ifndef lint
38#if 0
39static const char sccsid[] = "@(#)tty_subs.c	8.2 (Berkeley) 4/18/94";
40#else
41static const char rcsid[] = "$OpenBSD: tty_subs.c,v 1.12 2003/06/02 23:32:09 millert Exp $";
42#endif
43#endif /* not lint */
44
45#include <sys/types.h>
46#include <sys/time.h>
47#include <sys/stat.h>
48#include <sys/param.h>
49#include <fcntl.h>
50#include <stdio.h>
51#include <errno.h>
52#include <unistd.h>
53#include <stdlib.h>
54#include <string.h>
55#include "pax.h"
56#include "extern.h"
57#include <stdarg.h>
58
59/*
60 * routines that deal with I/O to and from the user
61 */
62
63#define DEVTTY		"/dev/tty"	/* device for interactive i/o */
64static FILE *ttyoutf = NULL;		/* output pointing at control tty */
65static FILE *ttyinf = NULL;		/* input pointing at control tty */
66
67/*
68 * tty_init()
69 *	try to open the controlling terminal (if any) for this process. if the
70 *	open fails, future ops that require user input will get an EOF
71 */
72
73int
74tty_init(void)
75{
76	int ttyfd;
77
78	if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
79		if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
80			if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
81				return(0);
82			(void)fclose(ttyoutf);
83		}
84		(void)close(ttyfd);
85	}
86
87	if (iflag) {
88		paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
89		return(-1);
90	}
91	return(0);
92}
93
94/*
95 * tty_prnt()
96 *	print a message using the specified format to the controlling tty
97 *	if there is no controlling terminal, just return.
98 */
99
100void
101tty_prnt(const char *fmt, ...)
102{
103	va_list ap;
104	if (ttyoutf == NULL)
105		return;
106	va_start(ap, fmt);
107	(void)vfprintf(ttyoutf, fmt, ap);
108	va_end(ap);
109	(void)fflush(ttyoutf);
110}
111
112/*
113 * tty_read()
114 *	read a string from the controlling terminal if it is open into the
115 *	supplied buffer
116 * Return:
117 *	0 if data was read, -1 otherwise.
118 */
119
120int
121tty_read(char *str, int len)
122{
123	char *pt;
124
125	if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
126		return(-1);
127	*(str + len) = '\0';
128
129	/*
130	 * strip off that trailing newline
131	 */
132	if ((pt = strchr(str, '\n')) != NULL)
133		*pt = '\0';
134	return(0);
135}
136
137/*
138 * paxwarn()
139 *	write a warning message to stderr. if "set" the exit value of pax
140 *	will be non-zero.
141 */
142
143void
144paxwarn(int set, const char *fmt, ...)
145{
146	va_list ap;
147
148	va_start(ap, fmt);
149	if (set && (pax_invalid_action==0))
150		exit_val = 1;
151	/*
152	 * when vflag we better ship out an extra \n to get this message on a
153	 * line by itself
154	 */
155	if (vflag && vfpart) {
156		(void)fflush(listf);
157		(void)fputc('\n', stderr);
158		vfpart = 0;
159	}
160	(void)fprintf(stderr, "%s: ", argv0);
161	(void)vfprintf(stderr, fmt, ap);
162	va_end(ap);
163	(void)fputc('\n', stderr);
164}
165
166/*
167 * syswarn()
168 *	write a warning message to stderr. if "set" the exit value of pax
169 *	will be non-zero.
170 */
171
172void
173syswarn(int set, int errnum, const char *fmt, ...)
174{
175	va_list ap;
176
177	va_start(ap, fmt);
178	if (set)
179		exit_val = 1;
180	/*
181	 * when vflag we better ship out an extra \n to get this message on a
182	 * line by itself
183	 */
184	if (vflag && vfpart) {
185		(void)fflush(listf);
186		(void)fputc('\n', stderr);
187		vfpart = 0;
188	}
189	(void)fprintf(stderr, "%s: ", argv0);
190	(void)vfprintf(stderr, fmt, ap);
191	va_end(ap);
192
193	/*
194	 * format and print the errno
195	 */
196	if (errnum > 0)
197		(void)fprintf(stderr, " <%s>", strerror(errnum));
198	(void)fputc('\n', stderr);
199}
200