1 /* This file is part of GNU tar.
2 Copyright 2007-2022 Free Software Foundation, Inc.
4 Written by Sergey Poznyakoff.
6 GNU tar is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 3, or (at your option) any later
11 GNU tar is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
14 Public License for more details.
16 You should have received a copy of the GNU General Public License along
17 with GNU tar. If not, see <http://www.gnu.org/licenses/>. */
22 struct compression_suffix
29 static struct compression_suffix compression_suffixes
[] = {
30 #define __CAT2__(a,b) a ## b
31 #define S(s,p) #s, sizeof (#s) - 1, __CAT2__(p,_PROGRAM)
47 { S(txz
, XZ
) }, /* Slackware */
55 static struct compression_suffix
const *
56 find_compression_suffix (const char *name
, size_t *ret_len
)
58 char *suf
= strrchr (name
, '.');
63 struct compression_suffix
*p
;
68 for (p
= compression_suffixes
; p
->suffix
; p
++)
70 if (p
->length
== len
&& memcmp (p
->suffix
, suf
, len
) == 0)
73 *ret_len
= strlen (name
) - len
- 1;
82 find_compression_program (const char *name
, const char *defprog
)
84 struct compression_suffix
const *p
= find_compression_suffix (name
, NULL
);
91 set_compression_program_by_suffix (const char *name
, const char *defprog
)
93 const char *program
= find_compression_program (name
, defprog
);
95 use_compress_program_option
= program
;
99 strip_compression_suffix (const char *name
)
103 struct compression_suffix
const *p
= find_compression_suffix (name
, &len
);
107 /* Strip an additional ".tar" suffix, but only if the just-stripped
108 "outer" suffix did not begin with "t". */
109 if (len
> 4 && strncmp (name
+ len
- 4, ".tar", 4) == 0
110 && p
->suffix
[0] != 't')
114 s
= xmalloc (len
+ 1);
115 memcpy (s
, name
, len
);