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
36 static 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 */
57 static FILE *ttyoutf = NULL; /* output pointing at control tty */
58 static 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
66 int
tty_init(void)67 tty_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
93 void
tty_prnt(const char * fmt,...)94 tty_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
113 int
tty_read(char * str,int len)114 tty_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
136 void
paxwarn(int set,const char * fmt,...)137 paxwarn(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
164 void
syswarn(int set,int errnum,const char * fmt,...)165 syswarn(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