| 1 | /* addext.c -- add an extension to a file name
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| 2 |
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| 3 | Copyright (C) 1990, 1997, 1998, 1999, 2001, 2003 Free Software
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| 4 | Foundation, Inc.
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program; see the file COPYING.
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| 18 | If not, write to the Free Software Foundation,
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| 19 | 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 20 |
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| 21 | /* Written by David MacKenzie <djm@gnu.ai.mit.edu> and Paul Eggert */
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| 22 |
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| 23 | #if HAVE_CONFIG_H
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| 24 | # include <config.h>
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| 25 | #endif
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| 26 |
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| 27 | #ifndef HAVE_DOS_FILE_NAMES
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| 28 | # define HAVE_DOS_FILE_NAMES 0
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| 29 | #endif
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| 30 | #ifndef HAVE_LONG_FILE_NAMES
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| 31 | # define HAVE_LONG_FILE_NAMES 0
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| 32 | #endif
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| 33 |
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| 34 | #if HAVE_LIMITS_H
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| 35 | # include <limits.h>
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| 36 | #endif
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| 37 | #ifndef _POSIX_NAME_MAX
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| 38 | # define _POSIX_NAME_MAX 14
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| 39 | #endif
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| 40 |
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| 41 | #include <sys/types.h>
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| 42 | #if HAVE_STRING_H
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| 43 | # include <string.h>
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| 44 | #else
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| 45 | # include <strings.h>
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| 46 | #endif
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| 47 |
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| 48 | #if HAVE_UNISTD_H
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| 49 | # include <unistd.h>
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| 50 | #endif
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| 51 |
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| 52 | #include <errno.h>
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| 53 | #ifndef errno
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| 54 | extern int errno;
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| 55 | #endif
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| 56 |
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| 57 | #include "backupfile.h"
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| 58 | #include "dirname.h"
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| 59 |
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| 60 | /* Append to FILENAME the extension EXT, unless the result would be too long,
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| 61 | in which case just append the character E. */
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| 62 |
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| 63 | void
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| 64 | addext (char *filename, char const *ext, int e)
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| 65 | {
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| 66 | char *s = base_name (filename);
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| 67 | size_t slen = base_len (s);
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| 68 | size_t extlen = strlen (ext);
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| 69 | size_t slen_max = HAVE_LONG_FILE_NAMES ? 255 : _POSIX_NAME_MAX;
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| 70 |
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| 71 | #if HAVE_PATHCONF && defined _PC_NAME_MAX
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| 72 | if (_POSIX_NAME_MAX < slen + extlen || HAVE_DOS_FILE_NAMES)
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| 73 | {
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| 74 | /* The new base name is long enough to require a pathconf check. */
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| 75 | long name_max;
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| 76 | errno = 0;
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| 77 | if (s == filename)
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| 78 | name_max = pathconf (".", _PC_NAME_MAX);
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| 79 | else
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| 80 | {
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| 81 | char c = *s;
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| 82 | if (! ISSLASH (c))
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| 83 | *s = 0;
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| 84 | name_max = pathconf (filename, _PC_NAME_MAX);
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| 85 | *s = c;
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| 86 | }
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| 87 | if (0 <= name_max || errno == 0)
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| 88 | {
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| 89 | long size = slen_max = name_max;
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| 90 | if (name_max != size)
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| 91 | slen_max = -1;
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| 92 | }
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| 93 | }
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| 94 | #endif
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| 95 |
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| 96 | if (HAVE_DOS_FILE_NAMES && slen_max <= 12)
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| 97 | {
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| 98 | /* Live within DOS's 8.3 limit. */
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| 99 | char *dot = strchr (s, '.');
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| 100 | if (dot)
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| 101 | {
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| 102 | slen -= dot + 1 - s;
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| 103 | s = dot + 1;
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| 104 | slen_max = 3;
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| 105 | }
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| 106 | else
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| 107 | slen_max = 8;
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| 108 | extlen = 9; /* Don't use EXT. */
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| 109 | }
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| 110 |
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| 111 | if (slen + extlen <= slen_max)
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| 112 | strcpy (s + slen, ext);
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| 113 | else
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| 114 | {
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| 115 | if (slen_max <= slen)
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| 116 | slen = slen_max - 1;
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| 117 | s[slen] = e;
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| 118 | s[slen + 1] = 0;
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| 119 | }
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| 120 | }
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