gnu/dist/texinfo/intl/relocatable.h

   1 /*      $NetBSD$        */
   2
   3 /* Provide relocatable packages.
   4    Copyright (C) 2003 Free Software Foundation, Inc.
   5    Written by Bruno Haible <bruno@clisp.org>, 2003.
   6
   7    This program is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU Library General Public License as published
   9    by the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20    USA.  */
  21
  22 #ifndef _RELOCATABLE_H
  23 #define _RELOCATABLE_H
  24
  25 #ifdef __cplusplus
  26 extern "C" {
  27 #endif
  28
  29
  30 /* This can be enabled through the configure --enable-relocatable option.  */
  31 #if ENABLE_RELOCATABLE
  32
  33 /* When building a DLL, we must export some functions.  Note that because
  34    this is a private .h file, we don't need to use __declspec(dllimport)
  35    in any case.  */
  36 #if defined _MSC_VER && BUILDING_DLL
  37 # define RELOCATABLE_DLL_EXPORTED __declspec(dllexport)
  38 #else
  39 # define RELOCATABLE_DLL_EXPORTED
  40 #endif
  41
  42 /* Sets the original and the current installation prefix of the package.
  43    Relocation simply replaces a pathname starting with the original prefix
  44    by the corresponding pathname with the current prefix instead.  Both
  45    prefixes should be directory names without trailing slash (i.e. use ""
  46    instead of "/").  */
  47 extern RELOCATABLE_DLL_EXPORTED void
  48        set_relocation_prefix (const char *orig_prefix,
  49                               const char *curr_prefix);
  50
  51 /* Returns the pathname, relocated according to the current installation
  52    directory.  */
  53 extern const char * relocate (const char *pathname);
  54
  55 /* Memory management: relocate() leaks memory, because it has to construct
  56    a fresh pathname.  If this is a problem because your program calls
  57    relocate() frequently, think about caching the result.  */
  58
  59 /* Convenience function:
  60    Computes the current installation prefix, based on the original
  61    installation prefix, the original installation directory of a particular
  62    file, and the current pathname of this file.  Returns NULL upon failure.  */
  63 extern const char * compute_curr_prefix (const char *orig_installprefix,
  64                                          const char *orig_installdir,
  65                                          const char *curr_pathname);
  66
  67 #else
  68
  69 /* By default, we use the hardwired pathnames.  */
  70 #define relocate(pathname) (pathname)
  71
  72 #endif
  73
  74
  75 #ifdef __cplusplus
  76 }
  77 #endif
  78
  79 #endif /* _RELOCATABLE_H */