tty_subs.c revision 1.15 
1/*	$NetBSD: tty_subs.c,v 1.15 2003/10/13 07:41:22 agc 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. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#if defined(__RCSID) && !defined(lint)
38#if 0
39static char sccsid[] = "@(#)tty_subs.c	8.2 (Berkeley) 4/18/94";
40#else
41__RCSID("$NetBSD: tty_subs.c,v 1.15 2003/10/13 07:41:22 agc 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 <ctype.h>
52#include <errno.h>
53#include <unistd.h>
54#include <stdlib.h>
55#include <string.h>
56#include "pax.h"
57#include "extern.h"
58#include <stdarg.h>
59
60/*
61 * routines that deal with I/O to and from the user
62 */
63
64#define DEVTTY		"/dev/tty"	/* device for interactive i/o */
65static FILE *ttyoutf = NULL;		/* output pointing at control tty */
66static FILE *ttyinf = NULL;		/* input pointing at control tty */
67
68/*
69 * tty_init()
70 *	try to open the controlling termina (if any) for this process. if the
71 *	open fails, future ops that require user input will get an EOF
72 */
73
74int
75tty_init(void)
76{
77	int ttyfd;
78
79	if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
80		if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
81			if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
82				return(0);
83			(void)fclose(ttyoutf);
84		}
85		(void)close(ttyfd);
86	}
87
88	if (iflag) {
89		tty_warn(1, "Fatal error, cannot open %s", DEVTTY);
90		return(-1);
91	}
92	return(0);
93}
94
95/*
96 * tty_prnt()
97 *	print a message using the specified format to the controlling tty
98 *	if there is no controlling terminal, just return.
99 */
100
101void
102tty_prnt(const char *fmt, ...)
103{
104	va_list ap;
105	if (ttyoutf == NULL)
106		return;
107	va_start(ap, fmt);
108	(void)vfprintf(ttyoutf, fmt, ap);
109	va_end(ap);
110	(void)fflush(ttyoutf);
111}
112
113/*
114 * tty_read()
115 *	read a string from the controlling terminal if it is open into the
116 *	supplied buffer
117 * Return:
118 *	0 if data was read, -1 otherwise.
119 */
120
121int
122tty_read(char *str, int len)
123{
124	char *pt;
125
126	if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
127		return(-1);
128	*(str + len) = '\0';
129
130	/*
131	 * strip off that trailing newline
132	 */
133	if ((pt = strchr(str, '\n')) != NULL)
134		*pt = '\0';
135	return(0);
136}
137
138/*
139 * tty_warn()
140 *	write a warning message to stderr. if "set" the exit value of pax
141 *	will be non-zero.
142 */
143
144void
145tty_warn(int set, const char *fmt, ...)
146{
147	va_list ap;
148	va_start(ap, fmt);
149	if (set)
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)fputc('\n', stderr);
157		vfpart = 0;
158	}
159	(void)fprintf(stderr, "%s: ", argv0);
160	(void)vfprintf(stderr, fmt, ap);
161	va_end(ap);
162	(void)fputc('\n', stderr);
163}
164
165/*
166 * syswarn()
167 *	write a warning message to stderr. if "set" the exit value of pax
168 *	will be non-zero.
169 */
170
171void
172syswarn(int set, int errnum, const char *fmt, ...)
173{
174	va_list ap;
175	va_start(ap, fmt);
176	if (set)
177		exit_val = 1;
178	/*
179	 * when vflag we better ship out an extra \n to get this message on a
180	 * line by itself
181	 */
182	if (vflag && vfpart) {
183		(void)fputc('\n', stdout);
184		vfpart = 0;
185	}
186	(void)fprintf(stderr, "%s: ", argv0);
187	(void)vfprintf(stderr, fmt, ap);
188	va_end(ap);
189
190	/*
191	 * format and print the errno
192	 */
193	if (errnum > 0)
194		(void)fprintf(stderr, " (%s)", strerror(errnum));
195	(void)fputc('\n', stderr);
196}
197