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
|
/*
* Header file for public domain tar (tape archive) program.
*
* @(#)tar.h 1.20 86/10/29 Public Domain.
*
* Created 25 August 1985 by John Gilmore, ihnp4!hoptoad!gnu.
*
* Id: tar.h,v 1.5 1999/01/13 15:44:10 christos Exp # checkin only
*/
/*
* Kludge for handling systems that can't cope with multiple
* external definitions of a variable. In ONE routine (tar.c),
* we #define TAR_EXTERN to null; here, we set it to "extern" if
* it is not already set.
*/
#ifndef TAR_EXTERN
#define TAR_EXTERN extern
#endif
/*
* Header block on tape.
*
* I'm going to use traditional DP naming conventions here.
* A "block" is a big chunk of stuff that we do I/O on.
* A "record" is a piece of info that we care about.
* Typically many "record"s fit into a "block".
*/
#define RECORDSIZE 512
#define NAMSIZ 100
#define TUNMLEN 32
#define TGNMLEN 32
union record {
char charptr[RECORDSIZE];
struct header {
char name[NAMSIZ];
char mode[8];
char uid[8];
char gid[8];
char size[12];
char mtime[12];
char chksum[8];
char linkflag;
char linkname[NAMSIZ];
char magic[8];
char uname[TUNMLEN];
char gname[TGNMLEN];
char devmajor[8];
char devminor[8];
} header;
};
/* The checksum field is filled with this while the checksum is computed. */
#define CHKBLANKS " " /* 8 blanks, no null */
/* The magic field is filled with this if uname and gname are valid. */
#define TMAGIC "ustar " /* 7 chars and a null */
/* The linkflag defines the type of file */
#define LF_OLDNORMAL '\0' /* Normal disk file, Unix compat */
#define LF_NORMAL '0' /* Normal disk file */
#define LF_LINK '1' /* Link to previously dumped file */
#define LF_SYMLINK '2' /* Symbolic link */
#define LF_CHR '3' /* Character special file */
#define LF_BLK '4' /* Block special file */
#define LF_DIR '5' /* Directory */
#define LF_FIFO '6' /* FIFO special file */
#define LF_CONTIG '7' /* Contiguous file */
/* Further link types may be defined later. */
/*
* Exit codes from the "tar" program
*/
#define EX_SUCCESS 0 /* success! */
#define EX_ARGSBAD 1 /* invalid args */
#define EX_BADFILE 2 /* invalid filename */
#define EX_BADARCH 3 /* bad archive */
#define EX_SYSTEM 4 /* system gave unexpected error */
/*
* Global variables
*/
TAR_EXTERN union record *ar_block; /* Start of block of archive */
TAR_EXTERN union record *ar_record; /* Current record of archive */
TAR_EXTERN union record *ar_last; /* Last+1 record of archive block */
TAR_EXTERN char ar_reading; /* 0 writing, !0 reading archive */
TAR_EXTERN int blocking; /* Size of each block, in records */
TAR_EXTERN int blocksize; /* Size of each block, in bytes */
TAR_EXTERN char *ar_file; /* File containing archive */
TAR_EXTERN char *name_file; /* File containing names to work on */
TAR_EXTERN char *tar; /* Name of this program */
/*
* Flags from the command line
*/
TAR_EXTERN char f_reblock; /* -B */
TAR_EXTERN char f_create; /* -c */
TAR_EXTERN char f_debug; /* -d */
TAR_EXTERN char f_sayblock; /* -D */
TAR_EXTERN char f_follow_links; /* -h */
TAR_EXTERN char f_ignorez; /* -i */
TAR_EXTERN char f_keep; /* -k */
TAR_EXTERN char f_modified; /* -m */
TAR_EXTERN char f_oldarch; /* -o */
TAR_EXTERN char f_use_protection; /* -p */
TAR_EXTERN char f_sorted_names; /* -s */
TAR_EXTERN char f_list; /* -t */
TAR_EXTERN char f_namefile; /* -T */
TAR_EXTERN char f_verbose; /* -v */
TAR_EXTERN char f_extract; /* -x */
TAR_EXTERN char f_compress; /* -z */
/*
* We now default to Unix Standard format rather than 4.2BSD tar format.
* The code can actually produce all three:
* f_standard ANSI standard
* f_oldarch V7
* neither 4.2BSD
* but we don't bother, since 4.2BSD can read ANSI standard format anyway.
* The only advantage to the "neither" option is that we can cmp(1) our
* output to the output of 4.2BSD tar, for debugging.
*/
#define f_standard (!f_oldarch)
/*
* Structure for keeping track of filenames and lists thereof.
*/
struct name {
struct name *next;
short length;
char found;
char name[NAMSIZ+1];
};
TAR_EXTERN struct name *namelist; /* Points to first name in list */
TAR_EXTERN struct name *namelast; /* Points to last name in list */
TAR_EXTERN int archive; /* File descriptor for archive file */
TAR_EXTERN int errors; /* # of files in error */
/*
*
* Due to the next struct declaration, each routine that includes
* "tar.h" must also include <sys/types.h>. I tried to make it automatic,
* but System V has no defines in <sys/types.h>, so there is no way of
* knowing when it has been included. In addition, it cannot be included
* twice, but must be included exactly once. Argghh!
*
* Thanks, typedef. Thanks, USG.
*/
struct link {
struct link *next;
dev_t dev;
ino_t ino;
short linkcount;
char name[NAMSIZ+1];
};
TAR_EXTERN struct link *linklist; /* Points to first link in list */
/*
* Error recovery stuff
*/
TAR_EXTERN char read_error_flag;
|
