1 /* $OpenBSD: tty_subs.c,v 1.18 2023/06/26 16:58:50 millert Exp $ */
2 /* $NetBSD: tty_subs.c,v 1.5 1995/03/21 09:07:52 cgd Exp $ */
3
4 /*-
5 * Copyright (c) 1992 Keith Muller.
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * Keith Muller of the University of California, San Diego.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #include <sys/types.h>
38 #include <sys/stat.h>
39 #include <fcntl.h>
40 #include <stdarg.h>
41 #include <stdio.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 #include "pax.h"
46 #include "extern.h"
47
48 /*
49 * routines that deal with I/O to and from the user
50 */
51
52 #define DEVTTY "/dev/tty" /* device for interactive i/o */
53 static FILE *ttyoutf = NULL; /* output pointing at control tty */
54 static FILE *ttyinf = NULL; /* input pointing at control tty */
55
56 /*
57 * tty_init()
58 * try to open the controlling terminal (if any) for this process. if the
59 * open fails, future ops that require user input will get an EOF
60 */
61
62 int
tty_init(void)63 tty_init(void)
64 {
65 int ttyfd;
66
67 if ((ttyfd = open(DEVTTY, O_RDWR | O_CLOEXEC)) >= 0) {
68 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
69 if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
70 return(0);
71 (void)fclose(ttyoutf);
72 }
73 (void)close(ttyfd);
74 }
75
76 if (iflag) {
77 paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
78 return(-1);
79 }
80 return(0);
81 }
82
83 /*
84 * tty_prnt()
85 * print a message using the specified format to the controlling tty
86 * if there is no controlling terminal, just return.
87 */
88
89 void
tty_prnt(const char * fmt,...)90 tty_prnt(const char *fmt, ...)
91 {
92 va_list ap;
93 char buf[8192];
94
95 if (ttyoutf == NULL)
96 return;
97 va_start(ap, fmt);
98 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
99 va_end(ap);
100 safe_print(buf, ttyoutf);
101 (void)fflush(ttyoutf);
102 }
103
104 /*
105 * tty_read()
106 * read a string from the controlling terminal if it is open into the
107 * supplied buffer
108 * Return:
109 * 0 if data was read, -1 otherwise.
110 */
111
112 int
tty_read(char * str,int len)113 tty_read(char *str, int len)
114 {
115 if (ttyinf == NULL || fgets(str, len, ttyinf) == NULL)
116 return(-1);
117
118 /*
119 * strip off that trailing newline
120 */
121 str[strcspn(str, "\n")] = '\0';
122 return(0);
123 }
124
125 /*
126 * paxwarn()
127 * write a warning message to stderr. if "set" the exit value of pax
128 * will be non-zero.
129 */
130
131 void
paxwarn(int set,const char * fmt,...)132 paxwarn(int set, const char *fmt, ...)
133 {
134 va_list ap;
135 char buf[8192];
136
137 if (set)
138 exit_val = 1;
139 /*
140 * when vflag we better ship out an extra \n to get this message on a
141 * line by itself
142 */
143 if (vflag && vfpart) {
144 (void)fflush(listf);
145 (void)fputc('\n', stderr);
146 vfpart = 0;
147 }
148 (void)fprintf(stderr, "%s: ", argv0);
149 va_start(ap, fmt);
150 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
151 va_end(ap);
152 safe_print(buf, stderr);
153 (void)fputc('\n', stderr);
154 }
155
156 /*
157 * syswarn()
158 * write a warning message to stderr. if "set" the exit value of pax
159 * will be non-zero.
160 */
161
162 void
syswarn(int set,int errnum,const char * fmt,...)163 syswarn(int set, int errnum, const char *fmt, ...)
164 {
165 va_list ap;
166 char buf[8192];
167
168 if (set)
169 exit_val = 1;
170 /*
171 * when vflag we better ship out an extra \n to get this message on a
172 * line by itself
173 */
174 if (vflag && vfpart) {
175 (void)fflush(listf);
176 (void)fputc('\n', stderr);
177 vfpart = 0;
178 }
179 (void)fprintf(stderr, "%s: ", argv0);
180 va_start(ap, fmt);
181 (void)vsnprintf(buf, sizeof(buf), fmt, ap);
182 va_end(ap);
183 safe_print(buf, stderr);
184
185 /*
186 * format and print the errno
187 */
188 if (errnum > 0)
189 (void)fprintf(stderr, ": %s", strerror(errnum));
190 (void)fputc('\n', stderr);
191 }
192