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/* relocatable.h - Provide relocatable packages. */
/* Copyright (C) 2003, 2005-2008 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2003.
This file is part of GNU Bash.
Bash 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.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _RELOCATABLE_H
#define _RELOCATABLE_H
/* This can be enabled through the configure --enable-relocatable option. */
#if ENABLE_RELOCATABLE
/* When building a DLL, we must export some functions. Note that because
this is a private .h file, we don't need to use __declspec(dllimport)
in any case. */
#if defined _MSC_VER && BUILDING_DLL
# define RELOCATABLE_DLL_EXPORTED __declspec(dllexport)
#else
# define RELOCATABLE_DLL_EXPORTED
#endif
/* Sets the original and the current installation prefix of the package.
Relocation simply replaces a pathname starting with the original prefix
by the corresponding pathname with the current prefix instead. Both
prefixes should be directory names without trailing slash (i.e. use ""
instead of "/"). */
extern RELOCATABLE_DLL_EXPORTED void
set_relocation_prefix (const char *orig_prefix,
const char *curr_prefix);
/* Returns the pathname, relocated according to the current installation
directory. */
extern const char * relocate (const char *pathname);
/* Memory management: relocate() leaks memory, because it has to construct
a fresh pathname. If this is a problem because your program calls
relocate() frequently, think about caching the result. */
/* Convenience function:
Computes the current installation prefix, based on the original
installation prefix, the original installation directory of a particular
file, and the current pathname of this file. Returns NULL upon failure. */
extern const char * compute_curr_prefix (const char *orig_installprefix,
const char *orig_installdir,
const char *curr_pathname);
#else
/* By default, we use the hardwired pathnames. */
#define relocate(pathname) (pathname)
#endif
#endif /* _RELOCATABLE_H */
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