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 * 3. 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 * @(#)tty_subs.c 8.2 (Berkeley) 4/18/94
34 * $FreeBSD: src/bin/pax/tty_subs.c,v 1.11.2.1 2001/08/01 05:03:12 obrien Exp $
35 * $DragonFly: src/bin/pax/tty_subs.c,v 1.6 2004/11/07 20:54:51 eirikn Exp $
36 */
37
38 #include <sys/types.h>
39 #include <sys/stat.h>
40 #include <fcntl.h>
41 #include <stdio.h>
42 #include <unistd.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include "pax.h"
46 #include "extern.h"
47 #include <stdarg.h>
48
49 /*
50 * routines that deal with I/O to and from the user
51 */
52
53 #define DEVTTY "/dev/tty" /* device for interactive i/o */
54 static FILE *ttyoutf = NULL; /* output pointing at control tty */
55 static FILE *ttyinf = NULL; /* input pointing at control tty */
56
57 /*
58 * tty_init()
59 * try to open the controlling terminal (if any) for this process. if the
60 * open fails, future ops that require user input will get an EOF
61 */
62
63 int
tty_init(void)64 tty_init(void)
65 {
66 int ttyfd;
67
68 if ((ttyfd = open(DEVTTY, O_RDWR)) >= 0) {
69 if ((ttyoutf = fdopen(ttyfd, "w")) != NULL) {
70 if ((ttyinf = fdopen(ttyfd, "r")) != NULL)
71 return(0);
72 fclose(ttyoutf);
73 }
74 close(ttyfd);
75 }
76
77 if (iflag) {
78 paxwarn(1, "Fatal error, cannot open %s", DEVTTY);
79 return(-1);
80 }
81 return(0);
82 }
83
84 /*
85 * tty_prnt()
86 * print a message using the specified format to the controlling tty
87 * if there is no controlling terminal, just return.
88 */
89
90 void
tty_prnt(const char * fmt,...)91 tty_prnt(const char *fmt, ...)
92 {
93 va_list ap;
94 va_start(ap, fmt);
95 if (ttyoutf == NULL)
96 return;
97 vfprintf(ttyoutf, fmt, ap);
98 va_end(ap);
99 fflush(ttyoutf);
100 }
101
102 /*
103 * tty_read()
104 * read a string from the controlling terminal if it is open into the
105 * supplied buffer
106 * Return:
107 * 0 if data was read, -1 otherwise.
108 */
109
110 int
tty_read(char * str,int len)111 tty_read(char *str, int len)
112 {
113 char *pt;
114
115 if ((--len <= 0) || (ttyinf == NULL) || (fgets(str,len,ttyinf) == NULL))
116 return(-1);
117 *(str + len) = '\0';
118
119 /*
120 * strip off that trailing newline
121 */
122 if ((pt = strchr(str, '\n')) != NULL)
123 *pt = '\0';
124 return(0);
125 }
126
127 /*
128 * paxwarn()
129 * write a warning message to stderr. if "set" the exit value of pax
130 * will be non-zero.
131 */
132
133 void
paxwarn(int set,const char * fmt,...)134 paxwarn(int set, const char *fmt, ...)
135 {
136 va_list ap;
137 va_start(ap, fmt);
138 if (set)
139 exit_val = 1;
140 /*
141 * when vflag we better ship out an extra \n to get this message on a
142 * line by itself
143 */
144 if (vflag && vfpart) {
145 fflush(listf);
146 fputc('\n', stderr);
147 vfpart = 0;
148 }
149 fprintf(stderr, "%s: ", argv0);
150 vfprintf(stderr, fmt, ap);
151 va_end(ap);
152 fputc('\n', stderr);
153 }
154
155 /*
156 * syswarn()
157 * write a warning message to stderr. if "set" the exit value of pax
158 * will be non-zero.
159 */
160
161 void
syswarn(int set,int errnum,const char * fmt,...)162 syswarn(int set, int errnum, const char *fmt, ...)
163 {
164 va_list ap;
165 va_start(ap, fmt);
166 if (set)
167 exit_val = 1;
168 /*
169 * when vflag we better ship out an extra \n to get this message on a
170 * line by itself
171 */
172 if (vflag && vfpart) {
173 fflush(listf);
174 fputc('\n', stderr);
175 vfpart = 0;
176 }
177 fprintf(stderr, "%s: ", argv0);
178 vfprintf(stderr, fmt, ap);
179 va_end(ap);
180
181 /*
182 * format and print the errno
183 */
184 if (errnum > 0)
185 fprintf(stderr, " <%s>", strerror(errnum));
186 fputc('\n', stderr);
187 }
188