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