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/* addext.c -- add an extension to a file name
Copyright (C) 1990, 1997-1999, 2001-2003, 2005-2006, 2015-2016 Free Software
Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by David MacKenzie <djm@gnu.ai.mit.edu> and Paul Eggert */
#include <config.h>
#ifndef HAVE_DOS_FILE_NAMES
# define HAVE_DOS_FILE_NAMES 0
#endif
#ifndef HAVE_LONG_FILE_NAMES
# define HAVE_LONG_FILE_NAMES 0
#endif
#include "backupfile.h"
#include <limits.h>
#ifndef _POSIX_NAME_MAX
# define _POSIX_NAME_MAX 14
#endif
#include <sys/types.h>
#if HAVE_STRING_H
# include <string.h>
#else
# include <strings.h>
#endif
#include <unistd.h>
#include "basename.h"
/* Append to FILENAME the extension EXT, unless the result would be too long,
in which case just append the character E. */
void
addext (char *filename, char const *ext, char e)
{
char *s = basename (filename);
size_t slen = strlen (s), extlen = strlen (ext);
long slen_max = -1;
#if HAVE_PATHCONF && defined _PC_NAME_MAX
if (slen + extlen <= _POSIX_NAME_MAX && ! HAVE_DOS_FILE_NAMES)
/* The file name is so short there's no need to call pathconf. */
slen_max = _POSIX_NAME_MAX;
else if (s == filename)
slen_max = pathconf (".", _PC_NAME_MAX);
else
{
char c = *s;
*s = 0;
slen_max = pathconf (filename, _PC_NAME_MAX);
*s = c;
}
#endif
if (slen_max < 0)
slen_max = HAVE_LONG_FILE_NAMES ? 255 : 14;
if (HAVE_DOS_FILE_NAMES && slen_max <= 12)
{
/* Live within DOS's 8.3 limit. */
char *dot = strchr (s, '.');
if (dot)
{
slen -= dot + 1 - s;
s = dot + 1;
slen_max = 3;
}
else
slen_max = 8;
extlen = 9; /* Don't use EXT. */
}
if (slen + extlen <= slen_max)
strcpy (s + slen, ext);
else
{
if (slen_max <= slen)
slen = slen_max - 1;
s[slen] = e;
s[slen + 1] = 0;
}
}
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