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