tty_subs.c revision 1.5 
1/*	$NetBSD: tty_subs.c,v 1.5 1995/03/21 09:07:52 cgd 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#ifndef lint
41#if 0
42static char sccsid[] = "@(#)tty_subs.c	8.2 (Berkeley) 4/18/94";
43#else
44static char rcsid[] = "$NetBSD: tty_subs.c,v 1.5 1995/03/21 09:07:52 cgd Exp $";
45#endif
46#endif /* not lint */
47
48#include <sys/types.h>
49#include <sys/time.h>
50#include <sys/stat.h>
51#include <sys/param.h>
52#include <fcntl.h>
53#include <stdio.h>
54#include <ctype.h>
55#include <errno.h>
56#include <unistd.h>
57#include <stdlib.h>
58#include <string.h>
59#include "pax.h"
60#include "extern.h"
61#if __STDC__
62#include <stdarg.h>
63#else
64#include <varargs.h>
65#endif
66
67/*
68 * routines that deal with I/O to and from the user
69 */
70
71#define DEVTTY          "/dev/tty"      /* device for interactive i/o */
72static FILE *ttyoutf = NULL;		/* output pointing at control tty */
73static FILE *ttyinf = NULL;		/* input pointing at control tty */
74
75/*
76 * tty_init()
77 *	try to open the controlling termina (if any) for this process. if the
78 *	open fails, future ops that require user input will get an EOF
79 */
80
81#if __STDC__
82int
83tty_init(void)
84#else
85int
86tty_init()
87#endif
88{
89	int ttyfd;
90
91        if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
92		if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
93			if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
94				return(0);
95			(void)fclose(ttyoutf);
96		}
97		(void)close(ttyfd);
98	}
99
100	if (iflag) {
101		warn(1, "Fatal error, cannot open %s", DEVTTY);
102		return(-1);
103	}
104	return(0);
105}
106
107/*
108 * tty_prnt()
109 *	print a message using the specified format to the controlling tty
110 *	if there is no controlling terminal, just return.
111 */
112
113#if __STDC__
114void
115tty_prnt(char *fmt, ...)
116#else
117void
118tty_prnt(fmt, va_alist)
119	char *fmt;
120	va_dcl
121#endif
122{
123	va_list ap;
124#	if __STDC__
125	va_start(ap, fmt);
126#	else
127	va_start(ap);
128#	endif
129	if (ttyoutf == NULL)
130		return;
131	(void)vfprintf(ttyoutf, fmt, ap);
132	va_end(ap);
133	(void)fflush(ttyoutf);
134}
135
136/*
137 * tty_read()
138 *	read a string from the controlling terminal if it is open into the
139 *	supplied buffer
140 * Return:
141 *	0 if data was read, -1 otherwise.
142 */
143
144#if __STDC__
145int
146tty_read(char *str, int len)
147#else
148int
149tty_read(str, len)
150	char *str;
151	int len;
152#endif
153{
154	register char *pt;
155
156	if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
157		return(-1);
158	*(str + len) = '\0';
159
160	/*
161	 * strip off that trailing newline
162	 */
163	if ((pt = strchr(str, '\n')) != NULL)
164		*pt = '\0';
165	return(0);
166}
167
168/*
169 * warn()
170 *	write a warning message to stderr. if "set" the exit value of pax
171 *	will be non-zero.
172 */
173
174#if __STDC__
175void
176warn(int set, char *fmt, ...)
177#else
178void
179warn(set, fmt, va_alist)
180	int set;
181	char *fmt;
182	va_dcl
183#endif
184{
185	va_list ap;
186#	if __STDC__
187	va_start(ap, fmt);
188#	else
189	va_start(ap);
190#	endif
191	if (set)
192		exit_val = 1;
193	/*
194	 * when vflag we better ship out an extra \n to get this message on a
195	 * line by itself
196	 */
197	if (vflag && vfpart) {
198		(void)fputc('\n', stderr);
199		vfpart = 0;
200	}
201	(void)fprintf(stderr, "%s: ", argv0);
202	(void)vfprintf(stderr, fmt, ap);
203	va_end(ap);
204	(void)fputc('\n', stderr);
205}
206
207/*
208 * syswarn()
209 *	write a warning message to stderr. if "set" the exit value of pax
210 *	will be non-zero.
211 */
212
213#if __STDC__
214void
215syswarn(int set, int errnum, char *fmt, ...)
216#else
217void
218syswarn(set, errnum, fmt, va_alist)
219	int set;
220	int errnum;
221	char *fmt;
222	va_dcl
223#endif
224{
225	va_list ap;
226#	if __STDC__
227	va_start(ap, fmt);
228#	else
229	va_start(ap);
230#	endif
231	if (set)
232		exit_val = 1;
233	/*
234	 * when vflag we better ship out an extra \n to get this message on a
235	 * line by itself
236	 */
237	if (vflag && vfpart) {
238		(void)fputc('\n', stderr);
239		vfpart = 0;
240	}
241	(void)fprintf(stderr, "%s: ", argv0);
242	(void)vfprintf(stderr, fmt, ap);
243	va_end(ap);
244
245	/*
246	 * format and print the errno
247	 */
248	if (errnum > 0)
249		(void)fprintf(stderr, " <%s>", strerror(errnum));
250	(void)fputc('\n', stderr);
251}
252