tty_subs.c revision 99110 
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
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)tty_subs.c	8.2 (Berkeley) 4/18/94";
41#endif
42#endif /* not lint */
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD: head/bin/pax/tty_subs.c 99110 2002-06-30 05:15:05Z obrien $");
45
46#include <sys/types.h>
47#include <sys/stat.h>
48#include <fcntl.h>
49#include <stdio.h>
50#include <unistd.h>
51#include <stdlib.h>
52#include <string.h>
53#include "pax.h"
54#include "extern.h"
55#include <stdarg.h>
56
57/*
58 * routines that deal with I/O to and from the user
59 */
60
61#define DEVTTY	  "/dev/tty"      /* device for interactive i/o */
62static FILE *ttyoutf = NULL;		/* output pointing at control tty */
63static FILE *ttyinf = NULL;		/* input pointing at control tty */
64
65/*
66 * tty_init()
67 *	try to open the controlling terminal (if any) for this process. if the
68 *	open fails, future ops that require user input will get an EOF
69 */
70
71int
72tty_init(void)
73{
74	int ttyfd;
75
76	if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
77		if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
78			if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
79				return(0);
80			(void)fclose(ttyoutf);
81		}
82		(void)close(ttyfd);
83	}
84
85	if (iflag) {
86		paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
87		return(-1);
88	}
89	return(0);
90}
91
92/*
93 * tty_prnt()
94 *	print a message using the specified format to the controlling tty
95 *	if there is no controlling terminal, just return.
96 */
97
98void
99tty_prnt(const char *fmt, ...)
100{
101	va_list ap;
102	va_start(ap, fmt);
103	if (ttyoutf == NULL)
104		return;
105	(void)vfprintf(ttyoutf, fmt, ap);
106	va_end(ap);
107	(void)fflush(ttyoutf);
108}
109
110/*
111 * tty_read()
112 *	read a string from the controlling terminal if it is open into the
113 *	supplied buffer
114 * Return:
115 *	0 if data was read, -1 otherwise.
116 */
117
118int
119tty_read(char *str, int len)
120{
121	char *pt;
122
123	if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
124		return(-1);
125	*(str + len) = '\0';
126
127	/*
128	 * strip off that trailing newline
129	 */
130	if ((pt = strchr(str, '\n')) != NULL)
131		*pt = '\0';
132	return(0);
133}
134
135/*
136 * paxwarn()
137 *	write a warning message to stderr. if "set" the exit value of pax
138 *	will be non-zero.
139 */
140
141void
142paxwarn(int set, const char *fmt, ...)
143{
144	va_list ap;
145	va_start(ap, fmt);
146	if (set)
147		exit_val = 1;
148	/*
149	 * when vflag we better ship out an extra \n to get this message on a
150	 * line by itself
151	 */
152	if (vflag && vfpart) {
153		(void)fflush(listf);
154		(void)fputc('\n', stderr);
155		vfpart = 0;
156	}
157	(void)fprintf(stderr, "%s: ", argv0);
158	(void)vfprintf(stderr, fmt, ap);
159	va_end(ap);
160	(void)fputc('\n', stderr);
161}
162
163/*
164 * syswarn()
165 *	write a warning message to stderr. if "set" the exit value of pax
166 *	will be non-zero.
167 */
168
169void
170syswarn(int set, int errnum, const char *fmt, ...)
171{
172	va_list ap;
173	va_start(ap, fmt);
174	if (set)
175		exit_val = 1;
176	/*
177	 * when vflag we better ship out an extra \n to get this message on a
178	 * line by itself
179	 */
180	if (vflag && vfpart) {
181		(void)fflush(listf);
182		(void)fputc('\n', stderr);
183		vfpart = 0;
184	}
185	(void)fprintf(stderr, "%s: ", argv0);
186	(void)vfprintf(stderr, fmt, ap);
187	va_end(ap);
188
189	/*
190	 * format and print the errno
191	 */
192	if (errnum > 0)
193		(void)fprintf(stderr, " <%s>", strerror(errnum));
194	(void)fputc('\n', stderr);
195}
196