| 1 | /* Provide relocatable packages.
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| 2 | Copyright (C) 2003 Free Software Foundation, Inc.
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| 3 | Written by Bruno Haible <bruno@clisp.org>, 2003.
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| 4 |
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| 5 | This program is free software; you can redistribute it and/or modify it
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| 6 | under the terms of the GNU Library General Public License as published
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| 7 | by the Free Software Foundation; either version 2, or (at your option)
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| 8 | any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 13 | Library General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU Library General Public
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| 16 | License along with this program; if not, write to the Free Software
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| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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| 18 | USA. */
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| 19 |
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| 20 | #ifndef _RELOCATABLE_H
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| 21 | #define _RELOCATABLE_H
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| 22 |
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| 23 | /* This can be enabled through the configure --enable-relocatable option. */
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| 24 | #if ENABLE_RELOCATABLE
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| 25 |
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| 26 | /* When building a DLL, we must export some functions. Note that because
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| 27 | this is a private .h file, we don't need to use __declspec(dllimport)
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| 28 | in any case. */
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| 29 | #if defined _MSC_VER && BUILDING_DLL
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| 30 | # define RELOCATABLE_DLL_EXPORTED __declspec(dllexport)
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| 31 | #else
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| 32 | # define RELOCATABLE_DLL_EXPORTED
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| 33 | #endif
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| 34 |
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| 35 | /* Sets the original and the current installation prefix of the package.
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| 36 | Relocation simply replaces a pathname starting with the original prefix
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| 37 | by the corresponding pathname with the current prefix instead. Both
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| 38 | prefixes should be directory names without trailing slash (i.e. use ""
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| 39 | instead of "/"). */
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| 40 | extern RELOCATABLE_DLL_EXPORTED void
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| 41 | set_relocation_prefix (const char *orig_prefix,
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| 42 | const char *curr_prefix);
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| 43 |
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| 44 | /* Returns the pathname, relocated according to the current installation
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| 45 | directory. */
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| 46 | extern const char * relocate (const char *pathname);
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| 47 |
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| 48 | /* Memory management: relocate() leaks memory, because it has to construct
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| 49 | a fresh pathname. If this is a problem because your program calls
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| 50 | relocate() frequently, think about caching the result. */
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| 51 |
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| 52 | /* Convenience function:
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| 53 | Computes the current installation prefix, based on the original
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| 54 | installation prefix, the original installation directory of a particular
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| 55 | file, and the current pathname of this file. Returns NULL upon failure. */
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| 56 | extern const char * compute_curr_prefix (const char *orig_installprefix,
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| 57 | const char *orig_installdir,
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| 58 | const char *curr_pathname);
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| 59 |
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| 60 | #else
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| 61 |
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| 62 | /* By default, we use the hardwired pathnames. */
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| 63 | #define relocate(pathname) (pathname)
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| 64 |
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| 65 | #endif
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| 66 |
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| 67 | #endif /* _RELOCATABLE_H */
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