1 /* Provide relocatable packages. 2 Copyright (C) 2003 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2003. 4 5 This program is free software; you can redistribute it and/or modify it 6 under the terms of the GNU Library General Public License as published 7 by the Free Software Foundation; either version 2, or (at your option) 8 any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Library General Public License for more details. 14 15 You should have received a copy of the GNU Library General Public 16 License along with this program; if not, write to the Free Software 17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 18 USA. */ 19 20 #ifndef _RELOCATABLE_H 21 #define _RELOCATABLE_H 22 23 #ifdef __cplusplus 24 extern "C" { 25 #endif 26 27 28 /* This can be enabled through the configure --enable-relocatable option. */ 29 #if ENABLE_RELOCATABLE 30 31 /* When building a DLL, we must export some functions. Note that because 32 this is a private .h file, we don't need to use __declspec(dllimport) 33 in any case. */ 34 #if defined _MSC_VER && BUILDING_DLL 35 # define RELOCATABLE_DLL_EXPORTED __declspec(dllexport) 36 #else 37 # define RELOCATABLE_DLL_EXPORTED 38 #endif 39 40 /* Sets the original and the current installation prefix of the package. 41 Relocation simply replaces a pathname starting with the original prefix 42 by the corresponding pathname with the current prefix instead. Both 43 prefixes should be directory names without trailing slash (i.e. use "" 44 instead of "/"). */ 45 extern RELOCATABLE_DLL_EXPORTED void 46 set_relocation_prefix (const char *orig_prefix, 47 const char *curr_prefix); 48 49 /* Returns the pathname, relocated according to the current installation 50 directory. */ 51 extern const char * relocate (const char *pathname); 52 53 /* Memory management: relocate() leaks memory, because it has to construct 54 a fresh pathname. If this is a problem because your program calls 55 relocate() frequently, think about caching the result. */ 56 57 /* Convenience function: 58 Computes the current installation prefix, based on the original 59 installation prefix, the original installation directory of a particular 60 file, and the current pathname of this file. Returns NULL upon failure. */ 61 extern const char * compute_curr_prefix (const char *orig_installprefix, 62 const char *orig_installdir, 63 const char *curr_pathname); 64 65 #else 66 67 /* By default, we use the hardwired pathnames. */ 68 #define relocate(pathname) (pathname) 69 70 #endif 71 72 73 #ifdef __cplusplus 74 } 75 #endif 76 77 #endif /* _RELOCATABLE_H */ 78