tty_subs.c revision 1.12 
1/*	$NetBSD: tty_subs.c,v 1.12 2003/02/09 18:27:10 grant Exp $	*/
2
3/*-
4 * Copyright (c) 1992 Keith Muller.
5 * Copyright (c) 1992, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Keith Muller of the University of California, San Diego.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by the University of
22 *	California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 *    may be used to endorse or promote products derived from this software
25 *    without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40#include <sys/cdefs.h>
41#if defined(__RCSID) && !defined(lint)
42#if 0
43static char sccsid[] = "@(#)tty_subs.c	8.2 (Berkeley) 4/18/94";
44#else
45__RCSID("$NetBSD: tty_subs.c,v 1.12 2003/02/09 18:27:10 grant Exp $");
46#endif
47#endif /* not lint */
48
49#include <sys/types.h>
50#include <sys/time.h>
51#include <sys/stat.h>
52#include <sys/param.h>
53#include <fcntl.h>
54#include <stdio.h>
55#include <ctype.h>
56#include <errno.h>
57#include <unistd.h>
58#include <stdlib.h>
59#include <string.h>
60#include "pax.h"
61#include "extern.h"
62#include <stdarg.h>
63
64/*
65 * routines that deal with I/O to and from the user
66 */
67
68#define DEVTTY		"/dev/tty"	/* device for interactive i/o */
69static FILE *ttyoutf = NULL;		/* output pointing at control tty */
70static FILE *ttyinf = NULL;		/* input pointing at control tty */
71
72/*
73 * tty_init()
74 *	try to open the controlling termina (if any) for this process. if the
75 *	open fails, future ops that require user input will get an EOF
76 */
77
78int
79tty_init(void)
80{
81	int ttyfd;
82
83	if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
84		if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
85			if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
86				return(0);
87			(void)fclose(ttyoutf);
88		}
89		(void)close(ttyfd);
90	}
91
92	if (iflag) {
93		tty_warn(1, "Fatal error, cannot open %s", DEVTTY);
94		return(-1);
95	}
96	return(0);
97}
98
99/*
100 * tty_prnt()
101 *	print a message using the specified format to the controlling tty
102 *	if there is no controlling terminal, just return.
103 */
104
105void
106tty_prnt(const char *fmt, ...)
107{
108	va_list ap;
109	if (ttyoutf == NULL)
110		return;
111	va_start(ap, fmt);
112	(void)vfprintf(ttyoutf, fmt, ap);
113	va_end(ap);
114	(void)fflush(ttyoutf);
115}
116
117/*
118 * tty_read()
119 *	read a string from the controlling terminal if it is open into the
120 *	supplied buffer
121 * Return:
122 *	0 if data was read, -1 otherwise.
123 */
124
125int
126tty_read(char *str, int len)
127{
128	char *pt;
129
130	if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
131		return(-1);
132	*(str + len) = '\0';
133
134	/*
135	 * strip off that trailing newline
136	 */
137	if ((pt = strchr(str, '\n')) != NULL)
138		*pt = '\0';
139	return(0);
140}
141
142/*
143 * tty_warn()
144 *	write a warning message to stderr. if "set" the exit value of pax
145 *	will be non-zero.
146 */
147
148void
149tty_warn(int set, const char *fmt, ...)
150{
151	va_list ap;
152	va_start(ap, fmt);
153	if (set)
154		exit_val = 1;
155	/*
156	 * when vflag we better ship out an extra \n to get this message on a
157	 * line by itself
158	 */
159	if (vflag && vfpart) {
160		(void)fputc('\n', stderr);
161		vfpart = 0;
162	}
163	(void)fprintf(stderr, "%s: ", argv0);
164	(void)vfprintf(stderr, fmt, ap);
165	va_end(ap);
166	(void)fputc('\n', stderr);
167}
168
169/*
170 * syswarn()
171 *	write a warning message to stderr. if "set" the exit value of pax
172 *	will be non-zero.
173 */
174
175void
176syswarn(int set, int errnum, const char *fmt, ...)
177{
178	va_list ap;
179	va_start(ap, fmt);
180	if (set)
181		exit_val = 1;
182	/*
183	 * when vflag we better ship out an extra \n to get this message on a
184	 * line by itself
185	 */
186	if (vflag && vfpart) {
187		(void)fputc('\n', stdout);
188		vfpart = 0;
189	}
190	(void)fprintf(stderr, "%s: ", argv0);
191	(void)vfprintf(stderr, fmt, ap);
192	va_end(ap);
193
194	/*
195	 * format and print the errno
196	 */
197	if (errnum > 0)
198		(void)fprintf(stderr, " <%s>", strerror(errnum));
199	(void)fputc('\n', stderr);
200}
201