1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)tty_subs.c 8.2 (Berkeley) 4/18/94";
39 #endif
40 #endif /* not lint */
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
43
44 #include <sys/types.h>
45 #include <sys/stat.h>
46 #include <fcntl.h>
47 #include <stdio.h>
48 #include <unistd.h>
49 #include <string.h>
50 #include "pax.h"
51 #include "extern.h"
52 #include <stdarg.h>
53
54 /*
55 * routines that deal with I/O to and from the user
56 */
57
58 #define DEVTTY "/dev/tty" /* device for interactive i/o */
59 static FILE *ttyoutf = NULL; /* output pointing at control tty */
60 static FILE *ttyinf = NULL; /* input pointing at control tty */
61
62 /*
63 * tty_init()
64 * try to open the controlling terminal (if any) for this process. if the
65 * open fails, future ops that require user input will get an EOF
66 */
67
68 int
tty_init(void)69 tty_init(void)
70 {
71 int ttyfd;
72
73 if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
74 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
75 if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
76 return(0);
77 (void)fclose(ttyoutf);
78 }
79 (void)close(ttyfd);
80 }
81
82 if (iflag) {
83 paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
84 return(-1);
85 }
86 return(0);
87 }
88
89 /*
90 * tty_prnt()
91 * print a message using the specified format to the controlling tty
92 * if there is no controlling terminal, just return.
93 */
94
95 void
tty_prnt(const char * fmt,...)96 tty_prnt(const char *fmt, ...)
97 {
98 va_list ap;
99 if (ttyoutf == NULL)
100 return;
101 va_start(ap, fmt);
102 (void)vfprintf(ttyoutf, fmt, ap);
103 va_end(ap);
104 (void)fflush(ttyoutf);
105 }
106
107 /*
108 * tty_read()
109 * read a string from the controlling terminal if it is open into the
110 * supplied buffer
111 * Return:
112 * 0 if data was read, -1 otherwise.
113 */
114
115 int
tty_read(char * str,int len)116 tty_read(char *str, int len)
117 {
118 char *pt;
119
120 if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
121 return(-1);
122 *(str + len) = '\0';
123
124 /*
125 * strip off that trailing newline
126 */
127 if ((pt = strchr(str, '\n')) != NULL)
128 *pt = '\0';
129 return(0);
130 }
131
132 /*
133 * paxwarn()
134 * write a warning message to stderr. if "set" the exit value of pax
135 * will be non-zero.
136 */
137
138 void
paxwarn(int set,const char * fmt,...)139 paxwarn(int set, const char *fmt, ...)
140 {
141 va_list ap;
142 va_start(ap, fmt);
143 if (set)
144 exit_val = 1;
145 /*
146 * when vflag we better ship out an extra \n to get this message on a
147 * line by itself
148 */
149 if (vflag && vfpart) {
150 (void)fflush(listf);
151 (void)fputc('\n', stderr);
152 vfpart = 0;
153 }
154 (void)fprintf(stderr, "%s: ", argv0);
155 (void)vfprintf(stderr, fmt, ap);
156 va_end(ap);
157 (void)fputc('\n', stderr);
158 }
159
160 /*
161 * syswarn()
162 * write a warning message to stderr. if "set" the exit value of pax
163 * will be non-zero.
164 */
165
166 void
syswarn(int set,int errnum,const char * fmt,...)167 syswarn(int set, int errnum, const char *fmt, ...)
168 {
169 va_list ap;
170 va_start(ap, fmt);
171 if (set)
172 exit_val = 1;
173 /*
174 * when vflag we better ship out an extra \n to get this message on a
175 * line by itself
176 */
177 if (vflag && vfpart) {
178 (void)fflush(listf);
179 (void)fputc('\n', stderr);
180 vfpart = 0;
181 }
182 (void)fprintf(stderr, "%s: ", argv0);
183 (void)vfprintf(stderr, fmt, ap);
184 va_end(ap);
185
186 /*
187 * format and print the errno
188 */
189 if (errnum > 0)
190 (void)fprintf(stderr, " <%s>", strerror(errnum));
191 (void)fputc('\n', stderr);
192 }
193