1 /* addext.c -- add an extension to a file name
3 Copyright (C) 1990, 1997, 1998, 1999, 2001, 2003 Free Software
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; see the file COPYING.
18 If not, write to the Free Software Foundation,
19 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21 /* Written by David MacKenzie <djm@gnu.ai.mit.edu> and Paul Eggert */
27 #ifndef HAVE_DOS_FILE_NAMES
28 # define HAVE_DOS_FILE_NAMES 0
30 #ifndef HAVE_LONG_FILE_NAMES
31 # define HAVE_LONG_FILE_NAMES 0
35 #ifndef _POSIX_NAME_MAX
36 # define _POSIX_NAME_MAX 14
51 #include "backupfile.h"
54 /* Append to FILENAME the extension EXT, unless the result would be too long,
55 in which case just append the character E. */
58 addext (char *filename, char const *ext, int e)
60 char *s = base_name (filename);
61 size_t slen = base_len (s);
62 size_t extlen = strlen (ext);
63 size_t slen_max = HAVE_LONG_FILE_NAMES ? 255 : _POSIX_NAME_MAX;
65 #if HAVE_PATHCONF && defined _PC_NAME_MAX
66 if (_POSIX_NAME_MAX < slen + extlen || HAVE_DOS_FILE_NAMES)
68 /* The new base name is long enough to require a pathconf check. */
72 name_max = pathconf (".", _PC_NAME_MAX);
78 name_max = pathconf (filename, _PC_NAME_MAX);
81 if (0 <= name_max || errno == 0)
83 long size = slen_max = name_max;
90 if (HAVE_DOS_FILE_NAMES && slen_max <= 12)
92 /* Live within DOS's 8.3 limit. */
93 char *dot = strchr (s, '.');
102 extlen = 9; /* Don't use EXT. */
105 if (slen + extlen <= slen_max)
106 strcpy (s + slen, ext);
109 if (slen_max <= slen)