aboutsummaryrefslogtreecommitdiff
path: root/usr.bin/tar/util.c
blob: 46bc72608074fb8d73e051308983cd51de659095 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
/*-
 * Copyright (c) 2003-2004 Tim Kientzle
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "bsdtar_platform.h"
__FBSDID("$FreeBSD$");

#include <sys/stat.h>
#include <sys/types.h>  /* Linux doesn't define mode_t, etc. in sys/stat.h. */
#include <archive_entry.h>
#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "bsdtar.h"

static void	bsdtar_vwarnc(struct bsdtar *, int code,
		    const char *fmt, va_list ap);

/*
 * Print a string, taking care with any non-printable characters.
 */

void
safe_fprintf(FILE *f, const char *fmt, ...)
{
	char *buff;
	char *buff_heap;
	int buff_length;
	int length;
	va_list ap;
	char *p;
	char buff_stack[256];

	/* Use a stack-allocated buffer if we can, for speed and safety. */
	buff_heap = NULL;
	buff_length = sizeof(buff_stack);
	buff = buff_stack;

	va_start(ap, fmt);
	length = vsnprintf(buff, buff_length, fmt, ap);
	va_end(ap);
	/* If the result is too large, allocate a buffer on the heap. */
	if (length >= buff_length) {
		buff_length = length+1;
		buff_heap = malloc(buff_length);
		/* Failsafe: use the truncated string if malloc fails. */
		if (buff_heap != NULL) {
			buff = buff_heap;
			va_start(ap, fmt);
			length = vsnprintf(buff, buff_length, fmt, ap);
			va_end(ap);
		}
	}

	for (p=buff; *p != '\0'; p++) {
		unsigned char c = *p;
		if (isprint(c) && c != '\\')
			putc(c, f);
		else
			switch (c) {
			case '\a': putc('\\', f); putc('a', f); break;
			case '\b': putc('\\', f); putc('b', f); break;
			case '\f': putc('\\', f); putc('f', f); break;
			case '\n': putc('\\', f); putc('n', f);	break;
#if '\r' != '\n'
			/* On some platforms, \n and \r are the same. */
			case '\r': putc('\\', f); putc('r', f);	break;
#endif
			case '\t': putc('\\', f); putc('t', f);	break;
			case '\v': putc('\\', f); putc('v', f);	break;
			case '\\': putc('\\', f); putc('\\', f); break;
			default:
				fprintf(f, "\\%03o", c);
			}
	}
	/* If we allocated a heap-based buffer, free it now. */
	if (buff_heap != NULL)
		free(buff_heap);
}

static void
bsdtar_vwarnc(struct bsdtar *bsdtar, int code, const char *fmt, va_list ap)
{
	fprintf(stderr, "%s: ", bsdtar->progname);
	vfprintf(stderr, fmt, ap);
	if (code != 0)
		fprintf(stderr, ": %s", strerror(code));
	fprintf(stderr, "\n");
}

void
bsdtar_warnc(struct bsdtar *bsdtar, int code, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	bsdtar_vwarnc(bsdtar, code, fmt, ap);
	va_end(ap);
}

void
bsdtar_errc(struct bsdtar *bsdtar, int eval, int code, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	bsdtar_vwarnc(bsdtar, code, fmt, ap);
	va_end(ap);
	exit(eval);
}

int
yes(const char *fmt, ...)
{
	char buff[32];
	char *p;
	ssize_t l;

	va_list ap;
	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
	fprintf(stderr, " (y/N)? ");
	fflush(stderr);

	l = read(2, buff, sizeof(buff));
	buff[l] = 0;

	for (p = buff; *p != '\0'; p++) {
		if (isspace(*p))
			continue;
		switch(*p) {
		case 'y': case 'Y':
			return (1);
		case 'n': case 'N':
			return (0);
		default:
			return (0);
		}
	}

	return (0);
}

void
bsdtar_strmode(struct archive_entry *entry, char *bp)
{
	static const char *perms = "?rwxrwxrwx ";
	static const mode_t permbits[] =
	    { S_IRUSR, S_IWUSR, S_IXUSR, S_IRGRP, S_IWGRP, S_IXGRP,
	      S_IROTH, S_IWOTH, S_IXOTH };
	mode_t mode;
	int i;

	/* Fill in a default string, then selectively override. */
	strcpy(bp, perms);

	mode = archive_entry_mode(entry);
	switch (mode & S_IFMT) {
	case S_IFREG:  bp[0] = '-'; break;
	case S_IFBLK:  bp[0] = 'b'; break;
	case S_IFCHR:  bp[0] = 'c'; break;
	case S_IFDIR:  bp[0] = 'd'; break;
	case S_IFLNK:  bp[0] = 'l'; break;
	case S_IFSOCK: bp[0] = 's'; break;
#ifdef S_IFIFO
	case S_IFIFO:  bp[0] = 'p'; break;
#endif
#ifdef S_IFWHT
	case S_IFWHT:  bp[0] = 'w'; break;
#endif
	}

	for (i = 0; i < 9; i++)
		if (!(mode & permbits[i]))
			bp[i+1] = '-';

	if (mode & S_ISUID) {
		if (mode & S_IXUSR) bp[3] = 's';
		else bp[3] = 'S';
	}
	if (mode & S_ISGID) {
		if (mode & S_IXGRP) bp[6] = 's';
		else bp[6] = 'S';
	}
	if (mode & S_ISVTX) {
		if (mode & S_IXGRP) bp[9] = 't';
		else bp[9] = 'T';
	}
	if (archive_entry_acl_count(entry, ARCHIVE_ENTRY_ACL_TYPE_ACCESS))
		bp[10] = '+';
}