115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
|
/* addext.c -- add an extension to a file name
|
||
|
|
Copyright 1990, 1997, 1998, 1999, 2001 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 2, 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; see the file COPYING.
|
||
|
|
If not, write to the Free Software Foundation,
|
||
|
|
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
|
||
|
|
|
||
|
|
/* Written by David MacKenzie <djm@gnu.ai.mit.edu> and Paul Eggert */
|
||
|
|
|
||
|
|
#if HAVE_CONFIG_H
|
||
|
|
# include <config.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef HAVE_DOS_FILE_NAMES
|
||
|
|
# define HAVE_DOS_FILE_NAMES 0
|
||
|
|
#endif
|
||
|
|
#ifndef HAVE_LONG_FILE_NAMES
|
||
|
|
# define HAVE_LONG_FILE_NAMES 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if HAVE_LIMITS_H
|
||
|
|
# include <limits.h>
|
||
|
|
#endif
|
||
|
|
#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
|
||
|
|
|
||
|
|
#if HAVE_UNISTD_H
|
||
|
|
# include <unistd.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#ifndef errno
|
||
|
|
extern int errno;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "backupfile.h"
|
||
|
|
#include "dirname.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, int e)
|
||
|
|
{
|
||
|
|
char *s = base_name (filename);
|
||
|
|
size_t slen = base_len (s);
|
||
|
|
size_t extlen = strlen (ext);
|
||
|
|
size_t slen_max = HAVE_LONG_FILE_NAMES ? 255 : _POSIX_NAME_MAX;
|
||
|
|
|
||
|
|
#if HAVE_PATHCONF && defined _PC_NAME_MAX
|
||
|
|
if (_POSIX_NAME_MAX < slen + extlen || HAVE_DOS_FILE_NAMES)
|
||
|
|
{
|
||
|
|
/* The new base name is long enough to require a pathconf check. */
|
||
|
|
long name_max;
|
||
|
|
errno = 0;
|
||
|
|
if (s == filename)
|
||
|
|
name_max = pathconf (".", _PC_NAME_MAX);
|
||
|
|
else
|
||
|
|
{
|
||
|
|
char c = *s;
|
||
|
|
if (! ISSLASH (c))
|
||
|
|
*s = 0;
|
||
|
|
name_max = pathconf (filename, _PC_NAME_MAX);
|
||
|
|
*s = c;
|
||
|
|
}
|
||
|
|
if (0 <= name_max || errno == 0)
|
||
|
|
slen_max = name_max == (size_t) name_max ? name_max : -1;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
}
|